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libPNG 1.0.3

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2216 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robert Roebling
1999-04-17 13:43:15 +00:00
parent d207efe172
commit a626cc0305
27 changed files with 3365 additions and 1645 deletions
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103
src/png/CHANGES
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@@ -283,6 +283,107 @@ version 1.0.0b [March 13, 1998]
Minor changes to makefile.s2x
Removed #ifdef/#endif around a png_free() in pngread.c
version 1.0.1 [March 14, 1998]
Changes makefile.s2x to reduce security risk of using a relative pathname
Changed makefile.s2x to reduce security risk of using a relative pathname
Fixed some typos in the documentation (Greg).
Fixed a problem with value of "channels" returned by png_read_update_info()
version 1.0.1a [April 21, 1998]
Optimized Paeth calculations by replacing abs() function calls with intrinsics
plus other loop optimizations. Improves avg decoding speed by about 20%.
Commented out i386istic "align" compiler flags in makefile.lnx.
Reduced the default warning level in some makefiles, to make them consistent.
Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
Added grayscale and 16-bit capability to png_do_read_filler().
Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
too large when writing an image with bit_depth < 8 (Bob Dellaca).
Corrected some bugs in the experimental weighted filtering heuristics.
Moved a misplaced pngrutil code block that truncates tRNS if it has more
than num_palette entries -- test was done before num_palette was defined.
Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
version 1.0.1b [May 2, 1998]
Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
Relocated the png_composite macros from pngrtran.c to png.h (Greg).
Added makefile.sco (contributed by Mike Hopkirk).
Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
More work on loop optimization which may help when compiled with C++ compilers.
Added warnings when people try to use transforms they've defined out.
Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
version 1.0.1c [May 11, 1998]
Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
filler bytes should have been 0xff instead of 0xf.
Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
for consistency, in pngconf.h
Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
to remove unwanted capabilities via the compile line
Made some corrections to grammar (which, it's) in documentation (Greg).
Corrected example.c, use of row_pointers in png_write_image().
version 1.0.1d [May 24, 1998]
Corrected several statements that used side effects illegally in pngrutil.c
and pngtrans.c, that were introduced in version 1.0.1b
Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
More corrections to example.c, use of row_pointers in png_write_image()
and png_read_rows().
Added pngdll.mak and pngdef.pas to scripts directory, contributed by
Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
Changed several loops from count-down to count-up, for consistency.
version 1.0.1e [June 6, 1998]
Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
added warnings when people try to set png_read_fn and png_write_fn in
the same structure.
Added a test such that png_do_gamma will be done when num_trans==0
for truecolor images that have defined a background. This corrects an
error that was introduced in libpng-0.90 that can cause gamma processing
to be skipped.
Added tests in png.h to include "trans" and "trans_values" in structures
when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
Added capability for user-provided malloc_fn() and free_fn() functions,
and revised pngtest.c to demonstrate their use, replacing the
PNGTEST_DEBUG_MEM feature.
Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
version 1.0.2 [June 14, 1998]
Fixed two bugs in makefile.bor .
version 1.0.2a [December 30, 1998]
Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
Fixed a bug in png_do_filler() that made it fail to write filler bytes in
the left-most pixel of each row (Kevin Bracey).
Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
in pngtest.c (Duncan Simpson).
Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
even when no tIME chunk was present in the source file.
Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
Fixed a problem in png_read_push_finish_row(), which would not skip some
passes that it should skip, for images that are less than 3 pixels high.
Interchanged the order of calls to png_do_swap() and png_do_shift()
in pngwtran.c (John Cromer).
Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
Changed "bad adaptive filter type" from error to warning in pngrutil.c .
Fixed a documentation error about default filtering with 8-bit indexed-color.
Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
(L. Peter Deutsch).
Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
Added png_get_copyright() and png_get_header_version() functions.
Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
Added information about debugging in libpng.txt and libpng.3 .
Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
Removed lines after Dynamic Dependencies" in makefile.aco .
Revised makefile.dec to make a shared library (Jeremie Petit).
Removed trailing blanks from all files.
version 1.0.2a [January 6, 1999]
Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
which is obsolete.
version 1.0.3 [January 14, 1999]
Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.

10
src/png/INSTALL
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@@ -1,5 +1,5 @@
Installing libpng version 1.0.1 March 15, 1998
Installing libpng version 1.0.3 - January 14, 1999
Before installing libpng, you must first install zlib. zlib
can usually be found wherever you got libpng. zlib can be
@@ -10,8 +10,8 @@ zlib.h and zconf.h include files that correspond to the
version of zlib that's installed.
You can rename the directories that you downloaded (they
might be called "libpng-1.0.1 or "lpng100" and "zlib-1.1.1"
or "zlib111") so that you have directories called "zlib" and "libpng".
might be called "libpng-1.0.3" or "lpng103" and "zlib-1.1.3"
or "zlib113") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
@@ -42,6 +42,7 @@ include
makefile.std => Generic UNIX makefile
makefile.knr => Archaic UNIX Makefile that converts files with ansi2knr
makefile.dec => DEC Alpha UNIX makefile
makefile.hux => HPUX (10.20 and 11.00) makefile
makefile.sgi => Silicon Graphics IRIX makefile
makefile.sun => Sun makefile
makefile.s2x => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
@@ -56,11 +57,14 @@ include
build.bat => MS-DOS batch file for Borland compiler
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.w32 => makefile for Microsoft Visual C++ 4.0 and later
makefile.tc3 => Turbo C 3.0 makefile
makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
pngos2.def => OS/2 module definition file used by makefile.os2
makefile.wat => Watcom 10a+ Makefile, 32-bit flat memory model
makevms.com => VMS build script
pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
Copy the file (or files) that you need from the
scripts directory into this directory, for example

6
src/png/README
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@@ -1,4 +1,4 @@
README for libpng 1.0.1 (shared library 2.1)
README for libpng 1.0.3 - January 14, 1999 (shared library 2.1)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
@@ -159,6 +159,7 @@ Files in this distribution:
makefile.std => Generic UNIX makefile
makefile.knr => Archaic UNIX Makefile that converts files with ansi2knr
makefile.dec => DEC Alpha UNIX makefile
makefile.hux => HPUX (10.20 and 11.00) makefile
makefile.sgi => Silicon Graphics IRIX makefile
makefile.sun => Sun makefile
makefile.s2x => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
@@ -173,11 +174,14 @@ Files in this distribution:
build.bat => MS-DOS batch file for Borland compiler
makefile.dj2 => DJGPP 2 makefile
makefile.msc => Microsoft C makefile
makefile.w32 => makefile for Microsoft Visual C++ 4.0 and later
makefile.tc3 => Turbo C 3.0 makefile
makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
makefile.wat => Watcom 10a+ Makefile, 32-bit flat memory model
pngos2.def => OS/2 module definition file used by makefile.os2
makevms.com => VMS build script
pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
Good luck, and happy coding.

44
src/png/TODO
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@@ -1,22 +1,24 @@
TODO - list of things to do for libpng
TODO - list of things to do for libpng:
fix problem with C++ and EXTERN "C"
add "grayscale->palette" transformation and "palette->grayscale" detection
add "grayscale" -> "grayscale+alpha" and "grayscale+FILLER" transformations
improved dithering
multi-lingual error and warning message support
sPLT chunk handling
cHRM transformation
complete sRGB transformation (presently it simply uses gamma=0.45)
man pages for function calls
high-level API for reading images
final bug fixes
better documentation
better filter selection
(counting huffman bits/precompression? filter inertia? filter costs?)
optional palette creation
histogram creation
support for application-defined chunk handlers
keep up with public chunks
better C++ wrapper/full C++ implementation?
text conversion between different code pages (Latin-1 -> Mac and DOS)
Final bug fixes.
Fix problem with C++ and EXTERN "C".
Better C++ wrapper/full C++ implementation?
Keep up with public chunks.
sPLT chunk handling.
cHRM transformation.
Support for application-defined chunk handlers.
Improve setjmp/longjmp usage or remove it in favor of returning error codes.
High-level API for reading images.
Add "grayscale->palette" transformation and "palette->grayscale" detection.
Color to gray transformation.
Improved dithering.
Multi-lingual error and warning message support.
Complete sRGB transformation (presently it simply uses gamma=0.45455).
Man pages for function calls.
Better documentation.
Better filter selection
(counting huffman bits/precompression? filter inertia? filter costs?).
Optional palette (sPLT) creation.
Histogram creation.
Text conversion between different code pages (Latin-1 -> Mac and DOS).
Improve API by hiding the info_ptr.

12
src/png/ansi2knr.c
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@@ -1,7 +1,9 @@
/* ansi2knr.c */
/* Convert ANSI C function definitions to K&R ("traditional C") syntax */
/*
/* Convert ANSI C function definitions to K&R ("traditional C") syntax
Copyright (C) 1989 Aladdin Enterprises. All rights reserved.
Copyright (C) 1988 Richard M. Stallman
ansi2knr is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY. No author or distributor accepts responsibility to anyone for the
consequences of using it or for whether it serves any particular purpose or
@@ -12,12 +14,12 @@ Everyone is granted permission to copy, modify and redistribute ansi2knr,
but only under the conditions described in the GPL. A copy of this license
is supposed to have been given to you along with ansi2knr so you can know
your rights and responsibilities. It should be in a file named COPYLEFT.
[In the IJG distribution, the GPL appears below, not in a separate file.]
[In the LIBPNG distribution, the GPL appears below, not in a separate file.]
Among other things, the copyright notice and this notice must be preserved
on all copies.
We explicitly state here what we believe is already implied by the GPL: if
the ansi2knr program is distributed as a separate set of sources and a
the ansi2knr program is distributed as a separate source file and a
separate executable file which are aggregated on a storage medium together
with another program, this in itself does not bring the other program under
the GPL, nor does the mere fact that such a program or the procedures for
@@ -27,7 +29,7 @@ program under the GPL.
/*
---------- Here is the GNU GPL file COPYLEFT, referred to above ----------
----- These terms do NOT apply to the JPEG software itself; see README ------
----- These terms do NOT apply to the LIBPNG software itself; see README ------
GHOSTSCRIPT GENERAL PUBLIC LICENSE
(Clarified 11 Feb 1988)

54
src/png/example.c
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@@ -13,10 +13,13 @@
* working PNG reader/writer, see pngtest.c, included in this distribution.
*/
#include "../png/png.h"
#include "png.h"
/* Check to see if a file is a PNG file using png_sig_cmp(). Returns
* non-zero if the image is a PNG, and 0 if it isn't a PNG.
/* Check to see if a file is a PNG file using png_sig_cmp(). png_sig_cmp()
* returns zero if the image is a PNG and nonzero if it isn't a PNG.
*
* The function check_if_png() shown here, but not used, returns nonzero (true)
* if the file can be opened and is a PNG, 0 (false) otherwise.
*
* If this call is successful, and you are going to keep the file open,
* you should call png_set_sig_bytes(png_ptr, PNG_BYTES_TO_CHECK); once
@@ -41,12 +44,14 @@ int check_if_png(char *file_name, FILE **fp)
if ((*fp = fopen(file_name, "rb")) != NULL);
return 0;
/* Read in the signature bytes */
/* Read in some of the signature bytes */
if (fread(buf, 1, PNG_BYTES_TO_CHECK, *fp) != PNG_BYTES_TO_CHECK)
return 0;
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature. */
return(png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
/* Compare the first PNG_BYTES_TO_CHECK bytes of the signature.
Return nonzero (true) if they match */
return(!png_sig_cmp(buf, (png_size_t)0, PNG_BYTES_TO_CHECK));
}
/* Read a PNG file. You may want to return an error code if the read
@@ -83,7 +88,7 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
* was compiled with a compatible version of the library. REQUIRED
*/
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
(void *)user_error_ptr, user_error_fn, user_warning_fn);
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
if (png_ptr == NULL)
{
@@ -221,10 +226,13 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
if (png_get_sRGB(png_ptr, info_ptr, &intent))
png_set_sRGB(png_ptr, intent, 0);
else
{
double image_gamma;
if (png_get_gAMA(png_ptr, info_ptr, &image_gamma))
png_set_gamma(png_ptr, screen_gamma, image_gamma);
else
png_set_gamma(png_ptr, screen_gamma, 0.50);
png_set_gamma(png_ptr, screen_gamma, 0.45455);
}
/* Dither RGB files down to 8 bit palette or reduce palettes
* to the number of colors available on your screen.
@@ -316,18 +324,18 @@ void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
#ifdef single /* Read the image a single row at a time */
for (y = 0; y < height; y++)
{
png_bytep row_pointers = row[y];
png_read_rows(png_ptr, &row_pointers, NULL, 1);
png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
}
#else no_single /* Read the image several rows at a time */
for (y = 0; y < height; y += number_of_rows)
{
#ifdef sparkle /* Read the image using the "sparkle" effect. */
png_read_rows(png_ptr, row_pointers, NULL, number_of_rows);
png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
#else no_sparkle /* Read the image using the "rectangle" effect */
png_read_rows(png_ptr, NULL, row_pointers, number_of_rows);
png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
#endif no_sparkle /* use only one of these two methods */
}
@@ -362,7 +370,7 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
* linked libraries.
*/
*png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING,
(void *)user_error_ptr, user_error_fn, user_warning_fn);
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
if (*png_ptr == NULL)
{
@@ -384,8 +392,11 @@ initialize_png_reader(png_structp *png_ptr, png_infop *info_ptr)
return ERROR;
}
/* this one's new. You will need to provide all three
/* This one's new. You will need to provide all three
* function callbacks, even if you aren't using them all.
* If you aren't using all functions, you can specify NULL
* parameters. Even when all three functions are NULL,
* you need to call png_set_progressive_read_fn().
* These functions shouldn't be dependent on global or
* static variables if you are decoding several images
* simultaneously. You should store stream specific data
@@ -498,7 +509,7 @@ void write_png(char *file_name /* , ... other image information ... */)
* in case we are using dynamically linked libraries. REQUIRED.
*/
png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
(void *)user_error_ptr, user_error_fn, user_warning_fn);
png_voidp user_error_ptr, user_error_fn, user_warning_fn);
if (png_ptr == NULL)
{
@@ -581,7 +592,7 @@ void write_png(char *file_name /* , ... other image information ... */)
text_ptr[2].key = "Description";
text_ptr[2].text = "<long text>";
text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
png_set_text(png_ptr, info_ptr, text_ptr, 2);
png_set_text(png_ptr, info_ptr, text_ptr, 3);
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
/* note that if sRGB is present the cHRM chunk must be ignored
@@ -638,7 +649,11 @@ void write_png(char *file_name /* , ... other image information ... */)
* layout, however, so choose what fits your needs best). You need to
* use the first method if you aren't handling interlacing yourself.
*/
png_byte row_pointers[height][width];
png_uint_32 k, height, width;
png_byte image[height][width];
png_bytep row_pointers[height];
for (k = 0; k < height; k++)
row_pointers[k] = image + k*width;
/* One of the following output methods is REQUIRED */
#ifdef entire /* write out the entire image data in one call */
@@ -653,13 +668,12 @@ void write_png(char *file_name /* , ... other image information ... */)
for (pass = 0; pass < number_passes; pass++)
{
/* Write a few rows at a time. */
png_write_rows(png_ptr, row_pointers, number_of_rows);
png_write_rows(png_ptr, &row_pointers[first_row], number_of_rows);
/* If you are only writing one row at a time, this works */
for (y = 0; y < height; y++)
{
png_bytep row_pointers = row[y];
png_write_rows(png_ptr, &row_pointers, 1);
png_write_rows(png_ptr, &row_pointers[y], 1);
}
}
#endif no_entire /* use only one output method */

364
src/png/libpng.3
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@@ -1,6 +1,6 @@
.TH LIBPNG 3 "March 15, 1998"
.TH LIBPNG 3 "January 14, 1999"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
.SH SYNOPSIS
#include <png.h>
@@ -27,14 +27,25 @@ png_structp png_create_read_struct (png_const_charp
user_png_ver, voidp error_ptr, png_error_ptr error_fn,
png_error_ptr warn_fn);
png_structp png_create_read_struct_2(png_const_charp user_png_ver,
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr
warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
png_free_ptr free_fn)
png_structp png_create_write_struct (png_const_charp
user_png_ver, voidp error_ptr, png_error_ptr error_fn,
png_error_ptr warn_fn);
void png_debug_free (png_structp png_ptr, png_voidp ptr);
png_structp png_create_write_struct_2(png_const_charp
user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
png_voidp png_debug_malloc (png_structp png_ptr, png_uint_32
size);
int png_debug(int level, png_const_charp message)
int png_debug1(int level, png_const_charp message, p1)
int png_debug2(int level, png_const_charp message, p1, p2)
void png_destroy_info_struct (png_structp png_ptr, png_infopp
info_ptr_ptr);
@@ -49,6 +60,8 @@ void png_error (png_structp png_ptr, png_const_charp error);
void png_free (png_structp png_ptr, png_voidp ptr);
void png_free_default(png_structp png_ptr, png_voidp ptr)
png_byte png_get_bit_depth (png_structp png_ptr, png_infop
info_ptr);
@@ -69,6 +82,8 @@ info_ptr);
png_byte png_get_compression_type (png_structp png_ptr,
png_infop info_ptr);
png_byte png_get_copyright (png_structp png_ptr);
png_voidp png_get_error_ptr (png_structp png_ptr);
png_byte png_get_filter_type (png_structp png_ptr, png_infop
@@ -77,9 +92,16 @@ info_ptr);
png_uint_32 png_get_gAMA (png_structp png_ptr, png_infop
info_ptr, double *file_gamma);
png_byte png_get_header_version (png_structp png_ptr);
png_uint_32 png_get_hIST (png_structp png_ptr, png_infop
info_ptr, png_uint_16p *hist);
png_uint_32 png_get_IHDR (png_structp png_ptr, png_infop
info_ptr, png_uint_32 *width, png_uint_32 *height, int
*bit_depth, int *color_type, int *interlace_type, int
*compression_type, int *filter_type);
png_uint_32 png_get_image_height (png_structp png_ptr,
png_infop info_ptr);
@@ -91,10 +113,7 @@ info_ptr);
png_voidp png_get_io_ptr (png_structp png_ptr);
png_uint_32 png_get_IHDR (png_structp png_ptr, png_infop
info_ptr, png_uint_32 *width, png_uint_32 *height, int
*bit_depth, int *color_type, int *interlace_type, int
*compression_type, int *filter_type);
png_voidp png_get_mem_ptr(png_structp png_ptr)
png_uint_32 png_get_oFFs (png_structp png_ptr, png_infop
info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, int
@@ -119,6 +138,8 @@ png_voidp png_get_progressive_ptr (png_structp png_ptr);
png_uint_32 png_get_PLTE (png_structp png_ptr, png_infop
info_ptr, png_colorp *palette, int *num_palette);
png_byte png_get_rgb_to_gray_status (png_structp png_ptr)
png_uint_32 png_get_rowbytes (png_structp png_ptr, png_infop
info_ptr);
@@ -168,6 +189,9 @@ void png_init_io (png_structp png_ptr, FILE *fp);
png_voidp png_malloc (png_structp png_ptr, png_uint_32 size);
png_voidp png_malloc_default(png_structp png_ptr,
png_uint_32 size)
voidp png_memcpy (png_voidp s1, png_voidp s2, png_size_t size);
png_voidp png_memcpy_check (png_structp png_ptr, png_voidp s1,
@@ -276,6 +300,9 @@ png_uint_32 width, png_uint_32 height, int bit_depth, int
color_type, int interlace_type, int compression_type, int
filter_type);
void png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
void png_set_oFFs (png_structp png_ptr, png_infop info_ptr,
png_uint_32 offset_x, png_uint_32 offset_y, int unit_type);
@@ -307,7 +334,7 @@ void png_set_read_status_fn (png_structp png_ptr, png_read_status_ptr
void png_set_read_user_transform_fn (png_structp png_ptr,
png_user_transform_ptr read_user_transform_fn);
void png_set_rgb_to_gray (png_structp png_ptr);
void png_set_rgb_to_gray (png_structp png_ptr, int error_action);
void png_set_sBIT (png_structp png_ptr, png_infop info_ptr,
png_color_8p sig_bit);
@@ -396,10 +423,10 @@ Following is a copy of the libpng.txt file that accompanies libpng.
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
libpng version 1.0.1 March 15, 1998
libpng version 1.0.3 - January 14, 1999
Updated and distributed by Glenn Randers-Pehrson
<randeg@alumni.rpi.edu>
Copyright (c) 1998, Glenn Randers-Pehrson
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
For conditions of distribution and use, see copyright
notice in png.h.
@@ -436,7 +463,8 @@ as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
additional chunks are described in the special-purpose public chunks
documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
about PNG can be found at the PNG home page, <http://www.cdrom.com/pub/png/>.
about PNG, and the latest version of libpng, can be found at the PNG home
page, <http://www.cdrom.com/pub/png/>.
Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as
@@ -453,6 +481,8 @@ work to be done (see the TODO file), libpng should cover the
majority of the needs of its users.
Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details.
@@ -522,7 +552,7 @@ Customizing libpng.
return;
}
fread(header, 1, number, fp);
is_png = png_check_sig(header, 0, number);
is_png = !png_sig_cmp(header, 0, number);
if (!is_png)
{
return;
@@ -539,7 +569,7 @@ be NULL if the default error handlers are to be used). See the section
on Changes to Libpng below regarding the old initialization functions.
png_structp png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
return;
@@ -560,12 +590,23 @@ on Changes to Libpng below regarding the old initialization functions.
return;
}
If you want to use your own memory allocation routines,
define PNG_USER_MEM_SUPPORTED and use
png_create_read_struct_2() instead of png_create_read_struct():
The error handling routines passed to png_create_read_struct() are only
necessary if you are not using the libpng supplied error handling
functions. When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass the
jmpbuf field of your png_struct. If you read the file from different
png_structp png_ptr = png_create_read_struct_2
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn, (png_voidp)
user_mem_ptr, user_malloc_fn, user_free_fn);
The error handling routines passed to png_create_read_struct()
and the memory alloc/free routines passed to png_create_struct_2()
are only necessary if you are not using the libpng supplied error
handling and memory alloc/free functions.
When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass
your png_ptr->jmpbuf. If you read the file from different
routines, you will need to update the jmpbuf field every time you enter
a new routine that will call a png_ function.
@@ -876,7 +917,10 @@ in RGBRGBRGB format unless png_set_filler() is called to insert filler
bytes, either before or after each RGB triplet. 16-bit RGB data will
be returned RRGGBB RRGGBB, with the most significant byte of the color
value first, unless png_set_strip_16() is called to transform it to
regular RGBRGB triplets.
regular RGB RGB triplets, or png_set_filler() is called to insert
filler bytes, either before or after each RRGGBB triplet. Similarly,
8-bit or 16-bit grayscale data can be modified with png_set_filler()
or png_set_strip_16().
The following code transforms grayscale images of less than 8 to 8 bits,
changes paletted images to RGB, and adds a full alpha channel if there is
@@ -952,7 +996,7 @@ into 4 bytes for windowing systems that need them in this format:
PNG_COLOR_TYPE_RGB) png_set_filler(png_ptr,
filler, PNG_FILLER_BEFORE);
where "filler" is the number to fill with, and the location is
where "filler" is the 8 or 16-bit number to fill with, and the location is
either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending upon whether
you want the filler before the RGB or after. This transformation
does not affect images that already have full alpha channels.
@@ -970,21 +1014,76 @@ RGB. This code will do that conversion:
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
with alpha. This is intended for conversion of images that really are
gray (red == green == blue), so the function simply strips out the red
and blue channels, leaving the green channel in the gray position.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_rgb_to_gray(png_ptr, error_action,
float red_weight, float green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
image has any pixel where
red != green or red != blue
error_action = 3: issue an error and abort the
conversion if the original
image has any pixel where
red != green or red != blue
red_weight: weight of red component
(NULL -> default 54/256)
green_weight: weight of green component
(NULL -> default 183/256)
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
the image rows, with the png_get_rgb_to_gray_status(png_ptr) function.
It will return a png_byte that is zero if the image was gray or
1 if there were any non-gray pixels. bKGD and sBIT data
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
With 0.0<=red_weight+green_weight<=1.0,
the normalized graylevel is computed:
int rw = red_weight * 256;
int gw = green_weight * 256;
int bw = 256 - (rw + gw);
gray = (rw*red + gw*green + bw*blue)/256;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
Libpng approximates this with
Y = 0.211 * R + 0.715 * G + 0.074 * B
which can be expressed with integers as
Y = (54 * R + 183 * G + 19 * B)/256
The calculation is done in a linear colorspace, if the image gamma
is known.
If you have a grayscale and you are using png_set_expand() to change to
a higher bit-depth you must indicate if the supplied background gray
is supplied in the original file bit depth (need_expand = 1) or in the
expanded bit depth (need_expand = 0). Similarly, if you are reading
a paletted image, you must indicate if you have supplied the background
as a palette index that needs to be expanded (need_expand = 1). You can
also specify an RGB triplet that isn't in the palette when setting your
background for a paletted image.
a higher bit-depth, you must either supply the background color as a gray
value at the original file bit-depth (need_expand = 1) or else supply the
background color as an RGB triplet at the final, expanded bit depth
(need_expand = 0). Similarly, if you are reading a paletted image, you
must either supply the background color as a palette index (need_expand = 1)
or as an RGB triplet that may or may not be in the palette (need_expand = 0).
png_color_16 my_background;
png_color_16p image_background;
if (png_get_bKGD(png_ptr, info_ptr,
&image_background))
png_set_background(png_ptr, image_background),
if (png_get_bKGD(png_ptr, info_ptr, &image_background))
png_set_background(png_ptr, image_background,
PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
else
png_set_background(png_ptr, &my_background,
@@ -1031,7 +1130,7 @@ compensation other than the display_gamma is needed (viewing_gamma=1.0).
The png_set_gamma() function handles gamma transformations of the data.
Pass both the file gamma and the current screen_gamma. If the file does
not have a gamma value, you can pass one anyway if you have an idea what
it is (usually 0.50 is a good guess for GIF images on PCs). Note
it is (usually 0.45455 is a good guess for GIF images on PCs). Note
that file gammas are inverted from screen gammas. See the discussions
on gamma in the PNG specification for an excellent description of what
gamma is, and why all applications should support it. It is strongly
@@ -1040,7 +1139,7 @@ recommended that PNG viewers support gamma correction.
if (png_get_gAMA(png_ptr, info_ptr, &gamma))
png_set_gamma(png_ptr, screen_gamma, gamma);
else
png_set_gamma(png_ptr, screen_gamma, 0.50);
png_set_gamma(png_ptr, screen_gamma, 0.45455);
If you need to reduce an RGB file to a paletted file, or if a paletted
file has more entries then will fit on your screen, png_set_dither()
@@ -1268,7 +1367,7 @@ png_infop info_ptr;
initialize_png_reader()
{
png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
return -1;
@@ -1291,7 +1390,9 @@ png_infop info_ptr;
to be called when the header info is valid,
when each row is completed, and when the image
is finished. If you aren't using all functions,
you can specify a NULL parameter. You can use
you can specify NULL parameters. Even when all
three functions are NULL, you need to call
png_set_progressive_read_fn(). You can use
any struct as the user_ptr (cast to a void pointer
for the function call), and retrieve the pointer
from inside the callbacks using the function
@@ -1337,7 +1438,7 @@ png_infop info_ptr;
}
/* This function is called (as set by
png_set_progressive_fn() above) when enough data
png_set_progressive_read_fn() above) when enough data
has been supplied so all of the header has been
read.
*/
@@ -1387,8 +1488,8 @@ png_infop info_ptr;
new_row);
/* where old_row is what was displayed for
previous rows. Note that the first pass
(pass == 0, really) will completely cover
previously for the row. Note that the first
pass (pass == 0, really) will completely cover
the old row, so the rows do not have to be
initialized. After the first pass (and only
for interlaced images), you will have to pass
@@ -1412,6 +1513,8 @@ png_infop info_ptr;
*/
}
.SH IV. Writing
Much of this is very similar to reading. However, everything of
@@ -1438,7 +1541,7 @@ both "png_ptr"; you can call them anything you like, such as
"read_ptr" and "write_ptr". Look at pngtest.c, for example.
png_structp png_ptr = png_create_write_struct
(PNG_LIBPNG_VER_STRING, (void *)user_error_ptr,
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
return;
@@ -1451,10 +1554,19 @@ both "png_ptr"; you can call them anything you like, such as
return;
}
If you want to use your own memory allocation routines,
define PNG_USER_MEM_SUPPORTED and use
png_create_write_struct_2() instead of png_create_read_struct():
png_structp png_ptr = png_create_write_struct_2
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn, (png_voidp)
user_mem_ptr, user_malloc_fn, user_free_fn);
After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call
setjmp and pass the jmpbuf field of your png_struct. If you
setjmp() and pass the png_ptr->jmpbuf. If you
write the file from different routines, you will need to update
the jmpbuf field every time you enter a new routine that will
call a png_ function. See your documentation of setjmp/longjmp
@@ -1468,6 +1580,8 @@ section below for more information on the libpng error handling.
fclose(fp);
return;
}
...
return;
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
@@ -1504,9 +1618,9 @@ not calling this function at all, as it has been tuned to deliver a good
speed/compression ratio. The second parameter to png_set_filter() is
the filter method, for which the only valid value is '0' (as of the
October 1996 PNG specification, version 1.0). The third parameter is a
flag that indicates
which filter type(s) are to be tested for each scanline. See the
Compression Library for details on the specific filter types.
flag that indicates which filter type(s) are to be tested for each
scanline. See the Compression Library for details on the specific filter
types.
/* turn on or off filtering, and/or choose
@@ -1698,7 +1812,7 @@ png_text structure holds a keyword-text value, and a compression type.
The compression types have the same valid numbers as the compression
types of the image data. Currently, the only valid number is zero.
However, you can store text either compressed or uncompressed, unlike
images which always have to be compressed. So if you don't want the
images, which always have to be compressed. So if you don't want the
text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE.
Until text gets around 1000 bytes, it is not worth compressing it.
After the text has been written out to the file, the compression type
@@ -1758,7 +1872,7 @@ depending on whether you mean the PNG file, the time the image was
created in a non-PNG format, a still photo from which the image was
scanned, or possibly the subject matter itself. In order to facilitate
machine-readable dates, it is recommended that the "Creation Time"
tEXt chunk use RFC 1123 format dates (e.g. 22 May 1997 18:07:10 GMT"),
tEXt chunk use RFC 1123 format dates (e.g. "22 May 1997 18:07:10 GMT"),
although this isn't a requirement. Unlike the tIME chunk, the
"Creation Time" tEXt chunk is not expected to be automatically changed
by the software. To facilitate the use of RFC 1123 dates, a function
@@ -1780,8 +1894,9 @@ checks to see if it has data that it can do something with, you should
make sure to only enable a transformation if it will be valid for the
data. For example, don't swap red and blue on grayscale data.
PNG files store RGB pixels packed into 3 bytes. This code tells
the library to expect input data with 4 bytes per pixel
PNG files store RGB pixels packed into 3 or 6 bytes. This code tells
the library to expand the input data to 4 or 8 bytes per pixel
(or expand 1 or 2-byte grayscale data to 2 or 4 bytes per pixel).
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
@@ -1899,11 +2014,11 @@ times, or any of that other stuff necessary with png_write_rows().
where row_pointers is:
png_bytef *row_pointers[height];
png_byte *row_pointers[height];
You can point to void or char or whatever you use for pixels.
If you can't want to write the whole image at once, you can
If you don't want to write the whole image at once, you can
use png_write_rows() instead. If the file is not interlaced,
this is simple:
@@ -1975,7 +2090,7 @@ The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works.
All of the memory allocation, input/output, and error handling in libpng
goes through callbacks which are user settable. The default routines are
goes through callbacks that are user settable. The default routines are
in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change
these functions, call the appropriate png_set_???_fn() function.
@@ -1997,14 +2112,15 @@ time, instead of calling the png_init_io() function. These functions
also provide a void pointer that can be retrieved via the function
png_get_io_ptr(). For example:
png_set_read_fn(png_structp png_ptr,
voidp io_ptr, png_rw_ptr read_data_fn)
png_set_read_fn(png_structp read_ptr,
voidp read_io_ptr, png_rw_ptr read_data_fn)
png_set_write_fn(png_structp png_ptr,
voidp io_ptr, png_rw_ptr write_data_fn,
png_set_write_fn(png_structp write_ptr,
voidp write_io_ptr, png_rw_ptr write_data_fn,
png_flush_ptr output_flush_fn);
voidp io_ptr = png_get_io_ptr(png_ptr);
voidp read_io_ptr = png_get_io_ptr(read_ptr);
voidp write_io_ptr = png_get_io_ptr(write_ptr);
The replacement I/O functions should have prototypes as follows:
@@ -2083,7 +2199,7 @@ won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
Configuring for DOS:
For DOS users which only have access to the lower 640K, you will
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
@@ -2095,7 +2211,7 @@ defined, and FAR gets defined to far in pngconf.h, and you should be
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
note that the row's of data are defined as png_bytepp which is a
note that the row's of data are defined as png_bytepp, which is an
unsigned char far * far *.
Configuring for gui/windowing platforms:
@@ -2155,8 +2271,8 @@ can call one of these functions. The selection and configuration
of row filters can have a significant impact on the size and
encoding speed and a somewhat lesser impact on the decoding speed
of an image. Filtering is enabled by default for RGB and grayscale
images (with and without alpha), and for 8-bit paletted images, but
not for paletted images with bit depths less than 8 bits/pixel.
images (with and without alpha), but not for paletted images nor
for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is
currently only '0' in the PNG 1.0 specification. The 'filters'
@@ -2191,10 +2307,10 @@ by telling it the relative computational costs of the filters.
PNG_FILTER_SELECTION_WEIGHTED, 3,
weights, costs);
The weights are multiplying factors which indicate to libpng that row
should be the same for successive rows unless another row filter is that
many times better than the previous filter. In the above example, if
the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a
The weights are multiplying factors that indicate to libpng that the
row filter should be the same for successive rows unless another row filter
is that many times better than the previous filter. In the above example,
if the previous 3 filters were SUB, SUB, NONE, the SUB filter could have a
"sum of absolute differences" 1.5 x 1.3 times higher than other filters
and still be chosen, while the NONE filter could have a sum 1.1 times
higher than other filters and still be chosen. Unspecified weights are
@@ -2217,19 +2333,23 @@ Removing unwanted object code:
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
never going to use an ability, you can change the #define to #undef
before recompiling libpng and save yourself code and data space.
You can also turn a number of them off en masse with a compiler directive
that defines PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED, or
PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED, or all four,
never going to use a capability, you can change the #define to #undef
before recompiling libpng and save yourself code and data space, or
you can turn off individual capabilities with defines that begin with
PNG_NO_.
You can also turn all of the transforms and ancillary chunk capabilities
off en masse with compiler directives that define
PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
or all four,
along with directives to turn on any of the capabilities that you do
want. The PNG_READ[or WRITE]_TRANSFORMS_NOT_SUPPORTED directives disable
want. The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable
the extra transformations but still leave the library fully capable of reading
and writing PNG files with all known public chunks [except for sPLT].
Use of the PNG_READ[or WRITE]_ANCILLARY_CHUNKS_NOT_SUPPORTED directive
Use of the PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive
produces a library that is incapable of reading or writing ancillary chunks.
If you are not using the progressive reading capability, you can
turn that off with PNG_PROGRESSIVE_READ_NOT_SUPPORTED (don't confuse
turn that off with PNG_NO_PROGRESSIVE_READ (don't confuse
this with the INTERLACING capability, which you'll still have).
All the reading and writing specific code are in separate files, so the
@@ -2245,10 +2365,46 @@ or DLL file), you should not remove or disable any parts of the library,
as this will cause applications linked with different versions of the
library to fail if they call functions not available in your library.
The size of the library itself should not be an issue, because only
those sections which are actually used will be loaded into memory.
those sections that are actually used will be loaded into memory.
Requesting debug printout:
Changes to Libpng from version 0.88
The macro definition PNG_DEBUG can be used to request debugging
printout. Set it to an integer value in the range 0 to 3. Higher
numbers result in increasing amounts of debugging information. The
information is printed to the "stderr" file, unless another file
name is specified in the PNG_DEBUG_FILE macro definition.
When PNG_DEBUG > 0, the following functions (macros) become available:
png_debug(level, message)
png_debug1(level, message, p1)
png_debug2(level, message, p1, p2)
in which "level" is compared to PNG_DEBUG to decide whether to print
the message, "message" is the formatted string to be printed,
and p1 and p2 are parameters that are to be embedded in the string
according to printf-style formatting directives. For example,
png_debug1(2, "foo=%d\n", foo);
is expanded to
if(PNG_DEBUG > 2)
fprintf(PNG_DEBUG_FILE, "foo=%d\n", foo);
When PNG_DEBUG is defined but is zero, the macros aren't defined, but you
can still use PNG_DEBUG to control your own debugging:
#ifdef PNG_DEBUG
fprintf(stderr, ...
#endif
When PNG_DEBUG = 1, the macros are defined, but only png_debug statements
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
.SH VI. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by
@@ -2274,13 +2430,65 @@ allocating and freeing the png_struct for each image read.
Setting the error callbacks via png_set_message_fn() before
png_read_init() as was suggested in libpng-0.88 is no longer supported
because this caused applications which do not use custom error functions
because this caused applications that do not use custom error functions
to fail if the png_ptr was not initialized to zero. It is still possible
to set the error callbacks AFTER png_read_init(), or to change them with
png_set_error_fn(), which is essentially the same function, but with a
new name to force compilation errors with applications that try to use
the old method.
.SH VII. Y2K Compliance in libpng
January 13, 1999
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
This is your unofficial assurance that libpng from version 0.81 and
upward are Y2K compliant. It is my belief that earlier versions were
also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
will hold years up to 65535. The other two hold the date in text
format, and will hold years up to 9999.
The integer is
"png_uint_16 year" in png_time_struct.
The strings are
"png_charp time_buffer" in png_struct and
"near_time_buffer", which is a local character string in png.c.
There are seven time-related functions:
png_convert_to_rfc_1123() in png.c
(formerly png_convert_to_rfc_1152() in error)
png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
png_convert_from_time_t() in pngwrite.c
png_get_tIME() in pngget.c
png_handle_tIME() in pngrutil.c, called in pngread.c
png_set_tIME() in pngset.c
png_write_tIME() in pngwutil.c, called in pngwrite.c
All appear to handle dates properly in a Y2K environment. The
png_convert_from_time_t() function calls gmtime() to convert from system
clock time, which returns (year - 1900), which we properly convert to
the full 4-digit year. There is a possibility that applications using
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
function, or incorrectly passing only a 2-digit year instead of
"year - 1900" into the png_convert_from_struct_tm() function, but this
is not under our control. The libpng documentation has always stated
that it works with 4-digit years, and the APIs have been documented as
such.
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
integer to hold the year, and can hold years as large as 65535.
Glenn Randers-Pehrson
libpng maintainer
PNG Development Group
.SH NOTE
Note about libpng version numbers:
@@ -2366,7 +2574,7 @@ possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
Libpng version 1.0.1 March 15, 1998:
Libpng version 1.0.3 - January 14, 1999:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
@@ -2376,6 +2584,10 @@ Supported by the PNG development group
.SH COPYRIGHT NOTICE:
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
Copyright (c) 1996, 1997 Andreas Dilger
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
The PNG Reference Library (libpng) is supplied "AS IS". The Contributing
Authors and Group 42, Inc. disclaim all warranties, expressed or implied,
including, without limitation, the warranties of merchantability and of

13
src/png/libpngpf.3
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@@ -1,6 +1,6 @@
.TH LIBPNGPF 3 "March 15, 1998"
.TH LIBPNGPF 3 "January 14, 1999"
.SH NAME
libpng \- Portable Network Graphics (PNG) Reference Library
libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
(private functions)
.SH SYNOPSIS
#include <png.h>
@@ -31,10 +31,15 @@ int png_crc_finish (png_structp png_ptr, png_uint_32 skip);
void png_crc_read (png_structp png_ptr, png_bytep buf,
png_size_t length);
png_voidp png_create_struct (int type);
png_voidp png_create_struct (int type, png_malloc_ptr malloc_fn);
png_voidp png_create_struct_2 (int type);
void png_destroy_struct (png_voidp struct_ptr);
void png_destroy_struct_2 (png_voidp struct_ptr, png_free_ptr
free_fn);
void png_do_background (png_row_infop row_info, png_bytep row,
png_color_16p trans_values, png_color_16p background,
png_color_16p background_1, png_bytep gamma_table, png_bytep
@@ -83,7 +88,7 @@ row);
void png_do_read_transformations (png_structp png_ptr);
void png_do_rgb_to_gray (png_row_infop row_info, png_bytep
int png_do_rgb_to_gray (png_row_infop row_info, png_bytep
row);
void png_do_shift (png_row_infop row_info, png_bytep row,

2
src/png/png.5
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@@ -1,4 +1,4 @@
.TH PNG 5 "March 15, 1998"
.TH PNG 5 "January 14, 1999"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION

85
src/png/png.c
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@@ -1,22 +1,22 @@
/* png.c - location for general purpose libpng functions
*
* libpng 1.0.1
* For conditions of distribution and use, see copyright notice in png.h
* libpng version 1.0.3 - January 14, 1999
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
*/
#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include "../png/png.h"
#include "png.h"
/* Version information for C files. This had better match the version
* string defined in png.h.
*/
char png_libpng_ver[12] = "1.0.1";
char png_libpng_ver[12] = "1.0.3";
/* Place to hold the signature string for a PNG file. */
png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
@@ -115,8 +115,8 @@ png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
}
/* (Obsolete) function to check signature bytes. It does not allow one
* to check a partial signature. This function will be removed in the
* future - use png_sig_cmp().
* to check a partial signature. This function might be removed in the
* future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
*/
int
png_check_sig(png_bytep sig, int num)
@@ -128,12 +128,10 @@ png_check_sig(png_bytep sig, int num)
voidpf
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
png_voidp ptr;
png_uint_32 num_bytes;
png_uint_32 num_bytes = (png_uint_32)items * size;
png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
num_bytes = (png_uint_32)items * size;
ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
if (num_bytes > (png_uint_32)0x8000)
if (num_bytes > (png_uint_32)0x8000L)
{
png_memset(ptr, 0, (png_size_t)0x8000L);
png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
@@ -201,7 +199,12 @@ png_create_info_struct(png_structp png_ptr)
png_debug(1, "in png_create_info_struct\n");
if(png_ptr == NULL) return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn)) != NULL)
#else
if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
#endif
{
png_info_init(info_ptr);
}
@@ -227,7 +230,11 @@ png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
{
png_info_destroy(png_ptr, info_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
*info_ptr_ptr = (png_infop)NULL;
}
}
@@ -252,11 +259,10 @@ void
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
int i;
png_debug(1, "in png_info_destroy\n");
if (info_ptr->text != NULL)
{
int i;
for (i = 0; i < info_ptr->num_text; i++)
{
png_free(png_ptr, info_ptr->text[i].key);
@@ -269,6 +275,7 @@ png_info_destroy(png_structp png_ptr, png_infop info_ptr)
png_free(png_ptr, info_ptr->pcal_units);
if (info_ptr->pcal_params != NULL)
{
int i;
for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
{
png_free(png_ptr, info_ptr->pcal_params[i]);
@@ -302,3 +309,51 @@ png_init_io(png_structp png_ptr, FILE *fp)
png_ptr->io_ptr = (png_voidp)fp;
}
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
png_charp
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{
static PNG_CONST char short_months[12][4] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
sizeof(char)));
}
#ifdef USE_FAR_KEYWORD
{
char near_time_buf[29];
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 32, short_months[(ptime->month - 1) % 12],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
png_memcpy(png_ptr->time_buffer, near_time_buf,
29*sizeof(char));
}
#else
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 32, short_months[(ptime->month - 1) % 12],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
#endif
return ((png_charp)png_ptr->time_buffer);
}
#endif /* PNG_TIME_RFC1123_SUPPORTED */
png_charp
png_get_copyright(png_structp png_ptr)
{
if(png_ptr == NULL)
/* silence compiler warning about unused png_ptr */ ;
return("\n libpng version 1.0.3 - January 14, 1999\n\
Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
Copyright (c) 1996, 1997 Andreas Dilger\n\
Copyright (c) 1998, 1999, Glenn Randers-Pehrson\n");
}

286
src/png/png.h
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@@ -1,12 +1,62 @@
/* png.h - header file for PNG reference library
*
* libpng 1.0.1
* For conditions of distribution and use, see the COPYRIGHT NOTICE below.
* libpng version 1.0.3 - January 14, 1999
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998 Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* Y2K compliance in libpng:
* =========================
*
* January 13, 1999
*
* Since the PNG Development group is an ad-hoc body, we can't make
* an official declaration.
*
* This is your unofficial assurance that libpng from version 0.81 and
* upward are Y2K compliant. It is my belief that earlier versions were
* also Y2K compliant.
*
* Libpng only has three year fields. One is a 2-byte unsigned integer
* that will hold years up to 65535. The other two hold the date in text
* format, and will hold years up to 9999.
*
* The integer is
* "png_uint_16 year" in png_time_struct.
*
* The strings are
* "png_charp time_buffer" in png_struct and
* "near_time_buffer", which is a local character string in png.c.
*
* There are seven time-related functions:
* png.c: png_convert_to_rfc_1123() in png.c
* (formerly png_convert_to_rfc_1152() in error)
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
* png_convert_from_time_t() in pngwrite.c
* png_get_tIME() in pngget.c
* png_handle_tIME() in pngrutil.c, called in pngread.c
* png_set_tIME() in pngset.c
* png_write_tIME() in pngwutil.c, called in pngwrite.c
*
* All handle dates properly in a Y2K environment. The
* png_convert_from_time_t() function calls gmtime() to convert from system
* clock time, which returns (year - 1900), which we properly convert to
* the full 4-digit year. There is a possibility that applications using
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
* function, or incorrectly passing only a 2-digit year instead of
* "year - 1900" into the png_convert_from_struct_tm() function, but this
* is not under our control. The libpng documentation has always stated
* that it works with 4-digit years, and the APIs have been documented as
* such.
*
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
* integer to hold the year, and can hold years as large as 65535.
*
*
* Glenn Randers-Pehrson
* libpng maintainer
* PNG Development Group
*
* Note about libpng version numbers:
*
@@ -18,7 +68,7 @@
*
* source png.h png.h shared-lib
* version string int version
* ------- ------ ------ ----------
* ------- ------ ----- ----------
* 0.89c ("1.0 beta 3") 0.89 89 1.0.89
* 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90]
* 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95]
@@ -31,17 +81,20 @@
* 1.00 1.00 100 2.1.0 [int should be 10000]
* 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
* 1.0.1 1.0.1 10001 2.1.0
* 1.0.1a-e 1.0.1a-e 10002 2.1.0.1a-e
* 1.0.2 1.0.2 10002 2.1.0.2
* 1.0.2a-c 1.0.2a 10003 2.1.0.2a-c
* 1.0.3 1.0.3 10003 2.1.0.3
*
* Henceforth the source version will match the shared-library minor
* and patch numbers; the shared-library major version number will be
* used for changes in backward compatibility, as it is intended.
* The PNG_PNGLIB_VER macro, which is not used within libpng but
* is available for applications, is an unsigned integer of the form
* xyyzz corresponding to the source version x.y.z (leading zeros in y and z).
* used for changes in backward compatibility, as it is intended. The
* PNG_PNGLIB_VER macro, which is not used within libpng but is available
* for applications, is an unsigned integer of the form xyyzz corresponding
* to the source version x.y.z (leading zeros in y and z).
*
*
* See libpng.txt for more information. The PNG specification is available
* as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
* See libpng.txt or libpng.3 for more information. The PNG specification
* is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
* and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
*
* Contributing Authors:
@@ -92,6 +145,7 @@
* appreciated.
*/
#ifndef _PNG_H
#define _PNG_H
@@ -106,10 +160,10 @@ extern "C" {
*/
/* include the compression library's header */
#include "../zlib/zlib.h"
#include "zlib.h"
/* include all user configurable info */
#include "../png/pngconf.h"
#include "pngconf.h"
/* This file is arranged in several sections. The first section contains
* structure and type definitions. The second section contains the external
@@ -118,14 +172,14 @@ extern "C" {
*/
/* Version information for png.h - this should match the version in png.c */
#define PNG_LIBPNG_VER_STRING "1.0.1"
#define PNG_LIBPNG_VER_STRING "1.0.3"
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
* We must not include leading zeros.
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
* version 1.0.0 was mis-numbered 100 instead of 10000). From
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */
#define PNG_LIBPNG_VER 10001 /* 1.0.1 */
#define PNG_LIBPNG_VER 10003 /* 1.0.3 */
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
@@ -145,6 +199,7 @@ extern int FARDATA png_pass_dsp_mask[7];
extern int FARDATA png_pass_width[7];
extern int FARDATA png_pass_height[7];
*/
#endif /* PNG_NO_EXTERN */
/* Three color definitions. The order of the red, green, and blue, (and the
@@ -231,7 +286,7 @@ typedef png_time FAR * FAR * png_timepp;
* With libpng < 0.95, it was only possible to directly set and read the
* the values in the png_info_struct, which meant that the contents and
* order of the values had to remain fixed. With libpng 0.95 and later,
* however, * there are now functions which abstract the contents of
* however, there are now functions that abstract the contents of
* png_info_struct from the application, so this makes it easier to use
* libpng with dynamic libraries, and even makes it possible to use
* libraries that don't have all of the libpng ancillary chunk-handing
@@ -289,14 +344,14 @@ typedef struct png_info_struct
/* The tEXt and zTXt chunks contain human-readable textual data in
* uncompressed and compressed forms, respectively. The data in "text"
* is an array of pointers to uncompressed, null-terminated C strings.
* Each chunk has a keyword which describes the textual data contained
* Each chunk has a keyword that describes the textual data contained
* in that chunk. Keywords are not required to be unique, and the text
* string may be empty. Any number of text chunks may be in an image.
*/
int num_text; /* number of comments read/to write */
int max_text; /* current size of text array */
png_textp text; /* array of comments read/to write */
#endif /* PNG_READ_tEXt/zTXt_SUPPORTED || PNG_WRITE_tEXt/zTXt_SUPPORTED */
#endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
/* The tIME chunk holds the last time the displayed image data was
* modified. See the png_time struct for the contents of this struct.
@@ -312,14 +367,15 @@ typedef struct png_info_struct
*/
png_color_8 sig_bit; /* significant bits in color channels */
#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) || \
defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The tRNS chunk supplies transparency data for paletted images and
* other image types that don't need a full alpha channel. There are
* "num_trans" transparency values for a paletted image, stored in the
* same order as the palette colors, starting from index 0. Values
* for the data are in the range [0, 255], ranging from fully transparent
* to fully opaque, respectively. For non-paletted images, there is a
* single color specified which should be treated as fully transparent.
* single color specified that should be treated as fully transparent.
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
*/
png_bytep trans; /* transparent values for paletted image */
@@ -491,10 +547,11 @@ typedef struct png_row_info_struct
typedef png_row_info FAR * png_row_infop;
typedef png_row_info FAR * FAR * png_row_infopp;
/* These are the function types for the I/O functions, and the functions which
* modify the default I/O functions to user I/O functions. The png_error_ptr
* type should match that of user supplied warning and error functions, while
* the png_rw_ptr type should match that of the user read/write data functions.
/* These are the function types for the I/O functions and for the functions
* that allow the user to override the default I/O functions with his or her
* own. The png_error_ptr type should match that of user-supplied warning
* and error functions, while the png_rw_ptr type should match that of the
* user read/write data functions.
*/
typedef struct png_struct_def png_struct;
typedef png_struct FAR * png_structp;
@@ -517,6 +574,9 @@ typedef void (*png_user_transform_ptr) PNGARG((png_structp,
png_row_infop, png_bytep));
#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
typedef void (*png_free_ptr) PNGARG((png_structp, png_structp));
/* The structure that holds the information to read and write PNG files.
* The only people who need to care about what is inside of this are the
* people who will be modifying the library for their own special needs.
@@ -589,7 +649,7 @@ struct png_struct_def
png_byte sig_bytes; /* magic bytes read/written from start of file */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
png_byte filler; /* filler byte for 24->32-bit pixel expansion */
png_uint_16 filler; /* filler bytes for pixel expansion */
#endif /* PNG_READ_FILLER_SUPPORTED */
#if defined(PNG_READ_bKGD_SUPPORTED)
png_byte background_gamma_type;
@@ -604,7 +664,7 @@ struct png_struct_def
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
png_uint_32 flush_rows; /* number of rows written since last flush */
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
#if defined(PNG_READ_GAMMA_SUPPORTED)
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
float gamma; /* file gamma value */
float screen_gamma; /* screen gamma value (display_gamma/viewing_gamma */
@@ -623,10 +683,11 @@ struct png_struct_def
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
png_color_8 shift; /* shift for significant bit tranformation */
#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
png_bytep trans; /* transparency values for paletted files */
png_color_16 trans_values; /* transparency values for non-paletted files */
#endif /* PNG_READ_tRNS_SUPPORTED || PNG_READ_BACKGROUND_SUPPORTED */
#endif /* PNG_READ|WRITE_tRNS_SUPPORTED||PNG_READ_EXPAND|BACKGROUND_SUPPORTED */
png_read_status_ptr read_row_fn; /* called after each row is decoded */
png_write_status_ptr write_row_fn; /* called after each row is encoded */
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -679,6 +740,17 @@ struct png_struct_def
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_charp time_buffer; /* String to hold RFC 1123 time text */
#endif /* PNG_TIME_RFC1123_SUPPORTED */
#ifdef PNG_USER_MEM_SUPPORTED
png_voidp mem_ptr; /* user supplied struct for mem functions */
png_malloc_ptr malloc_fn; /* function for allocating memory */
png_free_ptr free_fn; /* function for freeing memory */
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_byte rgb_to_gray_status;
png_byte rgb_to_gray_red_coeff;
png_byte rgb_to_gray_green_coeff;
png_byte rgb_to_gray_blue_coeff;
#endif
};
typedef png_struct FAR * FAR * png_structpp;
@@ -710,14 +782,25 @@ extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
extern PNG_EXPORT(png_structp,png_create_read_struct)
PNGARG((png_const_charp user_png_ver, voidp error_ptr,
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn));
/* Allocate and initialize png_ptr struct for reading, and any other memory */
/* Allocate and initialize png_ptr struct for writing, and any other memory */
extern PNG_EXPORT(png_structp,png_create_write_struct)
PNGARG((png_const_charp user_png_ver, voidp error_ptr,
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn));
#ifdef PNG_USER_MEM_SUPPORTED
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
#endif
/* Write a PNG chunk - size, type, (optional) data, CRC. */
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
png_bytep chunk_name, png_bytep data, png_size_t length));
@@ -779,8 +862,11 @@ extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
/* Reduce RGB to grayscale. (Not yet implemented) */
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr));
/* Reduce RGB to grayscale. */
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
int error_action, float red, float green ));
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
png_ptr));
#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
@@ -1084,6 +1170,7 @@ extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
* method of error handling. If error_fn or warning_fn is NULL, the
* default function will be used.
*/
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
@@ -1111,6 +1198,15 @@ extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
png_write_status_ptr write_row_fn));
#ifdef PNG_USER_MEM_SUPPORTED
/* Replace the default memory allocation functions with user supplied one(s). */
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
/* Return the user pointer associated with the memory functions */
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
#endif /* PNG_USER_MEM_SUPPORTED */
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
png_ptr, png_user_transform_ptr read_user_transform_fn));
@@ -1138,7 +1234,7 @@ extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
/* function which combines rows. Not very much different than the
/* function that combines rows. Not very much different than the
* png_combine_row() call. Is this even used?????
*/
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
@@ -1151,19 +1247,19 @@ extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
/* frees a pointer allocated by png_malloc() */
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
#ifdef PNG_USER_MEM_SUPPORTED
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
png_voidp ptr));
#endif /* PNG_USER_MEM_SUPPORTED */
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
png_voidp s1, png_voidp s2, png_uint_32 size));
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
png_voidp s1, int value, png_uint_32 size));
#ifdef PNGTEST_MEMORY_DEBUG
/* debugging versions of png_malloc() and png_free() */
extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
#endif
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
int check));
@@ -1390,8 +1486,7 @@ extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp text_ptr, int num_text));
#endif /* PNG_READ_tEXt_SUPPORTED || PNG_WRITE_tEXt_SUPPORTED ||
PNG_READ_zTXt_SUPPORTED || PNG_WRITE_zTXt_SUPPORTED */
#endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
#if defined(PNG_READ_tIME_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
@@ -1420,28 +1515,87 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
* only been added since version 0.95 so it is not implemented throughout
* libpng yet, but more support will be added as needed.
*/
#ifdef PNG_DEBUG
#if (PNG_DEBUG > 0)
#ifdef PNG_NO_STDIO
#include <stdio.h>
#endif
#ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */
#define png_debug(l,m) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))))
(l==2 ? "\t\t":(l>2 ? "\t\t\t":""))))
#define png_debug1(l,m,p1) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1)
(l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1)
#define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \
fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
(l==2 ? "\t\t":(l==3 ? "\t\t\t":""))),p1,p2)
#else
#define png_debug(l, m)
#define png_debug1(l, m, p1)
#define png_debug2(l, m, p1, p2)
(l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1,p2)
#endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
#define png_debug(l, m)
#endif
#ifndef png_debug1
#define png_debug1(l, m, p1)
#endif
#ifndef png_debug2
#define png_debug2(l, m, p1, p2)
#endif
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
#ifdef PNG_NO_EXTERN
/* this only gets included in png.c */
png_charp
png_get_header_version(png_structp png_ptr)
{
if(png_ptr == NULL)
/* silence compiler warning about unused png_ptr */ ;
return("\n libpng version 1.0.3 - January 14, 1999 (header)\n");
}
#endif
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines we avoid an integer divide, which will be slower on
* most machines. However, it does take more operations than the corresponding
* divide method, so it may be slower on a few RISC systems. There are two
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
*
* Note that the rounding factors are NOT supposed to be the same! 128 and
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
* standard method.
*
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
*/
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \
{ png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg)*(png_uint_16)(255 - \
(png_uint_16)(alpha)) + (png_uint_16)128); \
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
# define png_composite_16(composite, fg, alpha, bg) \
{ png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - \
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
#else /* standard method using integer division */
# define png_composite(composite, fg, alpha, bg) \
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
(png_uint_16)127) / 255)
# define png_composite_16(composite, fg, alpha, bg) \
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
(png_uint_32)32767) / (png_uint_32)65535L)
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
/* These next functions are used internally in the code. They generally
* shouldn't be used unless you are writing code to add or replace some
@@ -1484,7 +1638,7 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_DITHER 0x0040
#define PNG_BACKGROUND 0x0080
#define PNG_BACKGROUND_EXPAND 0x0100
#define PNG_RGB_TO_GRAY 0x0200 /* Not currently implemented */
/* 0x0200 unused */
#define PNG_16_TO_8 0x0400
#define PNG_RGBA 0x0800
#define PNG_EXPAND 0x1000
@@ -1496,6 +1650,9 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_STRIP_ALPHA 0x40000L
#define PNG_INVERT_ALPHA 0x80000L
#define PNG_USER_TRANSFORM 0x100000L
#define PNG_RGB_TO_GRAY_ERR 0x200000L
#define PNG_RGB_TO_GRAY_WARN 0x400000L
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
/* flags for png_create_struct */
#define PNG_STRUCT_PNG 0x0001
@@ -1525,6 +1682,7 @@ extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
#define PNG_FLAG_FREE_HIST 0x4000
#define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000L
#define PNG_FLAG_WROTE_tIME 0x10000L
#define PNG_FLAG_BACKGROUND_IS_GRAY 0x20000L
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
PNG_FLAG_CRC_ANCILLARY_NOWARN)
@@ -1590,7 +1748,7 @@ PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
#endif /* PNG_READ_pCAL_SUPPORTED */
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
#endif /* PNG_BIG_ENDIAN_GET_SUPPORTED */
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Initialize png_ptr struct for reading, and allocate any other memory.
* (old interface - NOT DLL EXPORTED).
@@ -1608,6 +1766,11 @@ PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
/* free memory from internal libpng struct */
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
malloc_fn));
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
png_free_ptr free_fn));
/* free any memory that info_ptr points to and reset struct. */
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
png_infop info_ptr));
@@ -1651,8 +1814,8 @@ PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
#endif
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
* The only currently known PNG chunk that uses signed numbers is
* the ancillary extension chunk, pCAL.
* The only currently known PNG chunks that use signed numbers are
* the ancillary extension chunks, oFFs and pCAL.
*/
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
@@ -1723,7 +1886,8 @@ PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
int num_hist));
#endif
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
defined(PNG_WRITE_pCAL_SUPPORTED)
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
png_charp key, png_charpp new_key));
#endif
@@ -1847,8 +2011,8 @@ PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
PNG_EXTERN void png_do_rgb_to_gray PNGARG((png_row_infop row_info,
png_bytep row));
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
row_info, png_bytep row));
#endif
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)

188
src/png/pngconf.h
View File

@@ -1,12 +1,11 @@
/* pngconf.h - machine configurable file for libpng
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
/* Any machine specific code is near the front of this file, so if you
@@ -18,6 +17,7 @@
#ifndef PNGCONF_H
#define PNGCONF_H
/* This is the size of the compression buffer, and thus the size of
* an IDAT chunk. Make this whatever size you feel is best for your
* machine. One of these will be allocated per png_struct. When this
@@ -47,17 +47,32 @@
#define PNG_MAX_MALLOC_64K
#endif
/* This protects us against compilers which run on a windowing system
/* This protects us against compilers that run on a windowing system
* and thus don't have or would rather us not use the stdio types:
* stdin, stdout, and stderr. The only one currently used is stderr
* in png_error() and png_warning(). #defining PNG_NO_STDIO will
* prevent these from being compiled and used.
* in png_error() and png_warning(). #defining PNG_NO_CONSOLE_IO will
* prevent these from being compiled and used. #defining PNG_NO_STDIO
* will also prevent these, plus will prevent the entire set of stdio
* macros and functions (FILE *, printf, etc.) from being compiled and used,
* unless PNG_DEBUG has been #defined.
*
* #define PNG_NO_CONSOLE_IO
* #define PNG_NO_STDIO
*/
#ifndef PNG_NO_STDIO
#ifdef PNG_DEBUG
# if (PNG_DEBUG > 0)
# include <stdio.h>
# endif
#else
# ifdef PNG_NO_STDIO
# ifndef PNG_NO_CONSOLE_IO
# define PNG_NO_CONSOLE_IO
# endif
# else
# include <stdio.h>
# endif
#endif
/* This macro protects us against machines that don't have function
* prototypes (ie K&R style headers). If your compiler does not handle
@@ -237,72 +252,139 @@ __dont__ include it again
/* Any transformations you will not be using can be undef'ed here */
/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
to turn it off with "*TRANSFORMS_NOT_SUPPORTED" on the compile line,
then pick and choose which ones to define without having to edit
this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED if you
only want to have a png-compliant reader/writer but don't need
to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
on the compile line, then pick and choose which ones to define without
having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
if you only want to have a png-compliant reader/writer but don't need
any of the extra transformations. This saves about 80 kbytes in a
typical installation of the library.
typical installation of the library. (PNG_NO_* form added in version
1.0.1c, for consistency)
*/
#ifndef PNG_READ_TRANSFORMS_NOT_SUPPORTED
#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
!defined(PNG_NO_READ_TRANSFORMS)
#define PNG_READ_TRANSFORMS_SUPPORTED
#endif
#ifndef PNG_WRITE_TRANSFORMS_NOT_SUPPORTED
#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
!defined(PNG_NO_WRITE_TRANSFORMS)
#define PNG_WRITE_TRANSFORMS_SUPPORTED
#endif
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
#ifndef PNG_NO_READ_EXPAND
#define PNG_READ_EXPAND_SUPPORTED
#endif
#ifndef PNG_NO_READ_SHIFT
#define PNG_READ_SHIFT_SUPPORTED
#endif
#ifndef PNG_NO_READ_PACK
#define PNG_READ_PACK_SUPPORTED
#endif
#ifndef PNG_NO_READ_BGR
#define PNG_READ_BGR_SUPPORTED
#endif
#ifndef PNG_NO_READ_SWAP
#define PNG_READ_SWAP_SUPPORTED
#endif
#ifndef PNG_NO_READ_PACKSWAP
#define PNG_READ_PACKSWAP_SUPPORTED
#endif
#ifndef PNG_NO_READ_INVERT
#define PNG_READ_INVERT_SUPPORTED
#endif
#ifndef PNG_NO_READ_DITHER
#define PNG_READ_DITHER_SUPPORTED
#endif
#ifndef PNG_NO_READ_BACKGROUND
#define PNG_READ_BACKGROUND_SUPPORTED
#endif
#ifndef PNG_NO_READ_16_TO_8
#define PNG_READ_16_TO_8_SUPPORTED
#endif
#ifndef PNG_NO_READ_FILLER
#define PNG_READ_FILLER_SUPPORTED
#endif
#ifndef PNG_NO_READ_GAMMA
#define PNG_READ_GAMMA_SUPPORTED
#endif
#ifndef PNG_NO_READ_GRAY_TO_RGB
#define PNG_READ_GRAY_TO_RGB_SUPPORTED
#endif
#ifndef PNG_NO_READ_SWAP_ALPHA
#define PNG_READ_SWAP_ALPHA_SUPPORTED
#endif
#ifndef PNG_NO_READ_INVERT_ALPHA
#define PNG_READ_INVERT_ALPHA_SUPPORTED
#endif
#ifndef PNG_NO_READ_STRIP_ALPHA
#define PNG_READ_STRIP_ALPHA_SUPPORTED
#endif
#ifndef PNG_NO_READ_USER_TRANSFORM
#define PNG_READ_USER_TRANSFORM_SUPPORTED
/* the following aren't implemented yet
#endif
#ifndef PNG_NO_READ_RGB_TO_GRAY
#define PNG_READ_RGB_TO_GRAY_SUPPORTED
*/
#endif
#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
#ifndef PNG_PROGRESSIVE_READ_NOT_SUPPORTED /* if you don't do progressive */
#if !defined(PNG_NO_PROGRESSIVE_READ) && \
!defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive */
#define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */
#endif /* about interlacing capability! You'll */
/* still have interlacing unless you change the following line: */
#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
#ifndef PNG_NO_READ_COMPOSITED_NODIV
#define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel and SGI */
#endif
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
#ifndef PNG_NO_WRITE_SHIFT
#define PNG_WRITE_SHIFT_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_PACK
#define PNG_WRITE_PACK_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_BGR
#define PNG_WRITE_BGR_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_SWAP
#define PNG_WRITE_SWAP_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_PACKSWAP
#define PNG_WRITE_PACKSWAP_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_INVERT
#define PNG_WRITE_INVERT_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_FILLER
#define PNG_WRITE_FILLER_SUPPORTED /* This is the same as WRITE_STRIP_ALPHA */
#define PNG_WRITE_FLUSH_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_SWAP_ALPHA
#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_INVERT_ALPHA
#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_USER_TRANSFORM
#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
#endif
#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
#define PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant
encoders, but can cause trouble
if left undefined */
#if !defined(PNG_NO_STDIO)
#ifndef PNG_NO_WRITE_WEIGHTED_FILTER
#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_FLUSH
#define PNG_WRITE_FLUSH_SUPPORTED
#endif
#ifndef PNG_NO_STDIO
#define PNG_TIME_RFC1123_SUPPORTED
#endif
@@ -322,7 +404,7 @@ __dont__ include it again
* png_get_x_offset_microns()
* png_get_y_offset_microns()
*/
#if !defined(PNG_NO_EASY_ACCESS)
#ifndef PNG_NO_EASY_ACCESS
#define PNG_EASY_ACCESS_SUPPORTED
#endif
@@ -331,6 +413,7 @@ __dont__ include it again
/* very little testing */
/*
#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
#define PNG_USER_MEM_SUPPORTED
*/
/* This is only for PowerPC big-endian and 680x0 systems */
@@ -351,45 +434,100 @@ __dont__ include it again
* a bit smaller.
*/
#ifndef PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED
#if !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
!defined(PNG_NO_READ_ANCILLARY_CHUNKS)
#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#endif
#ifndef PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED
#if !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
!defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#endif
#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#ifndef PNG_NO_READ_bKGD
#define PNG_READ_bKGD_SUPPORTED
#endif
#ifndef PNG_NO_READ_cHRM
#define PNG_READ_cHRM_SUPPORTED
#endif
#ifndef PNG_NO_READ_gAMA
#define PNG_READ_gAMA_SUPPORTED
#endif
#ifndef PNG_NO_READ_hIST
#define PNG_READ_hIST_SUPPORTED
#endif
#ifndef PNG_NO_READ_oFFs
#define PNG_READ_oFFs_SUPPORTED
#endif
#ifndef PNG_NO_READ_pCAL
#define PNG_READ_pCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_pHYs
#define PNG_READ_pHYs_SUPPORTED
#endif
#ifndef PNG_NO_READ_sBIT
#define PNG_READ_sBIT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sRGB
#define PNG_READ_sRGB_SUPPORTED
#endif
#ifndef PNG_NO_READ_tEXt
#define PNG_READ_tEXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_tIME
#define PNG_READ_tIME_SUPPORTED
#endif
#ifndef PNG_NO_READ_tRNS
#define PNG_READ_tRNS_SUPPORTED
#endif
#ifndef PNG_NO_READ_zTXt
#define PNG_READ_zTXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_OPT_PLTE
#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
/* PLTE chunk in RGB and RGBA images */
#endif /* PLTE chunk in RGB and RGBA images */
#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#ifndef PNG_NO_WRITE_bKGD
#define PNG_WRITE_bKGD_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_cHRM
#define PNG_WRITE_cHRM_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_gAMA
#define PNG_WRITE_gAMA_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_hIST
#define PNG_WRITE_hIST_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_oFFs
#define PNG_WRITE_oFFs_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_pCAL
#define PNG_WRITE_pCAL_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_pHYs
#define PNG_WRITE_pHYs_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_sBIT
#define PNG_WRITE_sBIT_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_sRGB
#define PNG_WRITE_sRGB_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_tEXt
#define PNG_WRITE_tEXt_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_tIME
#define PNG_WRITE_tIME_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_tRNS
#define PNG_WRITE_tRNS_SUPPORTED
#endif
#ifndef PNG_NO_WRITE_zTXt
#define PNG_WRITE_zTXt_SUPPORTED
#endif
#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
/* need the time information for reading tIME chunks */
@@ -539,6 +677,7 @@ typedef z_stream FAR * png_zstreamp;
# define NOCHECK 0
# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
# define png_strcpy _fstrcpy
# define png_strlen _fstrlen
# define png_memcmp _fmemcmp /* SJT: added */
# define png_memcpy _fmemcpy
@@ -546,6 +685,7 @@ typedef z_stream FAR * png_zstreamp;
#else /* use the usual functions */
# define CVT_PTR(ptr) (ptr)
# define CVT_PTR_NOCHECK(ptr) (ptr)
# define png_strcpy strcpy
# define png_strlen strlen
# define png_memcmp memcmp /* SJT: added */
# define png_memcpy memcpy

22
src/png/pngerror.c
View File

@@ -1,21 +1,20 @@
/* pngerror.c - stub functions for i/o and memory allocation
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file provides a location for all error handling. Users which
* This file provides a location for all error handling. Users who
* need special error handling are expected to write replacement functions
* and use png_set_error_fn() to use those functions. See the instructions
* at each function.
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
static void png_default_error PNGARG((png_structp png_ptr,
png_const_charp message));
@@ -52,7 +51,7 @@ png_warning(png_structp png_ptr, png_const_charp message)
png_default_warning(png_ptr, message);
}
/* These utilities are used internally to build an error message which relates
/* These utilities are used internally to build an error message that relates
* to the current chunk. The chunk name comes from png_ptr->chunk_name,
* this is used to prefix the message. The message is limited in length
* to 63 bytes, the name characters are output as hex digits wrapped in []
@@ -114,7 +113,7 @@ png_chunk_warning(png_structp png_ptr, png_const_charp message)
static void
png_default_error(png_structp png_ptr, png_const_charp message)
{
#ifndef PNG_NO_STDIO
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "libpng error: %s\n", message);
#endif
@@ -131,18 +130,17 @@ png_default_error(png_structp png_ptr, png_const_charp message)
/* This function is called when there is a warning, but the library thinks
* it can continue anyway. Replacement functions don't have to do anything
* here if you don't want to. In the default configuration, png_ptr is
* here if you don't want them to. In the default configuration, png_ptr is
* not used, but it is passed in case it may be useful.
*/
static void
png_default_warning(png_structp png_ptr, png_const_charp message)
{
if (png_ptr == NULL)
return;
#ifndef PNG_NO_STDIO
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "libpng warning: %s\n", message);
#endif
if (png_ptr == NULL)
return;
}
/* This function is called when the application wants to use another method

18
src/png/pngget.c
View File

@@ -1,16 +1,15 @@
/* pngget.c - retrieval of values from info struct
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
png_uint_32
png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
@@ -302,11 +301,11 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
}
return (retval);
}
#endif
#endif /* PNG_READ_pHYs_SUPPORTED */
#endif /* PNG_INCH_CONVERSIONS */
/* png_get_channels really belongs in here, too, but it's been around longer */
#endif /* PNG_EASY_ACCESS_SUPPORTED */
png_byte
@@ -642,3 +641,10 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
}
#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
png_byte
png_get_rgb_to_gray_status (png_structp png_ptr)
{
return png_ptr->rgb_to_gray_status;
}
#endif

207
src/png/pngmem.c
View File

@@ -1,30 +1,21 @@
/* pngmem.c - stub functions for memory allocation
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file provides a location for all memory allocation. Users which
* need special memory handling are expected to modify the code in this file
* to meet their needs. See the instructions at each function.
* This file provides a location for all memory allocation. Users who
* need special memory handling are expected to supply replacement
* functions for png_malloc() and png_free(), and to use
* png_create_read_struct_2() and png_create_write_struct_2() to
* identify the replacement functions.
*/
#define PNG_INTERNAL
#include "../png/png.h"
/* The following "hides" PNG_MALLOC and PNG_FREE thus allowing the pngtest
application to put a wrapper on top of them. */
#ifdef PNGTEST_MEMORY_DEBUG
#define PNG_MALLOC png_debug_malloc
#define PNG_FREE png_debug_free
#else
#define PNG_MALLOC png_malloc
#define PNG_FREE png_free
#endif
#include "png.h"
/* Borland DOS special memory handler */
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
@@ -35,6 +26,15 @@
png_voidp
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_struct_2(type, NULL));
}
/* Alternate version of png_create_struct, for use with user-defined malloc. */
png_voidp
png_create_struct_2(int type, png_malloc_ptr malloc_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_size_t size;
png_voidp struct_ptr;
@@ -45,11 +45,18 @@ png_create_struct(int type)
else
return ((png_voidp)NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
{
png_memset(struct_ptr, 0, size);
}
return (struct_ptr);
}
@@ -58,8 +65,27 @@ png_create_struct(int type)
void
png_destroy_struct(png_voidp struct_ptr)
{
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
}
/* Free memory allocated by a png_create_struct() call */
void
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
{
#endif
if (struct_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
if(free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
(*(free_fn))(png_ptr, struct_ptr);
struct_ptr = NULL;
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
farfree (struct_ptr);
struct_ptr = NULL;
}
@@ -72,7 +98,7 @@ png_destroy_struct(png_voidp struct_ptr)
* have the ability to do that.
*
* Borland seems to have a problem in DOS mode for exactly 64K.
* It gives you a segment with an offset of 8 (perhaps to store it's
* It gives you a segment with an offset of 8 (perhaps to store its
* memory stuff). zlib doesn't like this at all, so we have to
* detect and deal with it. This code should not be needed in
* Windows or OS/2 modes, and only in 16 bit mode. This code has
@@ -85,12 +111,27 @@ png_destroy_struct(png_voidp struct_ptr)
* (which should cause a fatal error) and introducing major problems.
*/
png_voidp
PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
png_malloc(png_structp png_ptr, png_uint_32 size)
{
#ifndef PNG_USER_MEM_SUPPORTED
png_voidp ret;
#endif
if (png_ptr == NULL || size == 0)
return ((png_voidp)NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
else
return png_malloc_default(png_ptr, size);
}
png_voidp
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
#endif /* PNG_USER_MEM_SUPPORTED */
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
png_error(png_ptr, "Cannot Allocate > 64K");
@@ -181,15 +222,30 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
return (ret);
}
/* free a pointer allocated by PNG_MALLOC(). In the default
/* free a pointer allocated by png_malloc(). In the default
configuration, png_ptr is not used, but is passed in case it
is needed. If ptr is NULL, return without taking any action. */
void
PNG_FREE(png_structp png_ptr, png_voidp ptr)
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
return;
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
ptr = NULL;
return;
}
else png_free_default(png_ptr, ptr);
}
void
png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
if (png_ptr->offset_table != NULL)
{
int i;
@@ -227,6 +283,17 @@ PNG_FREE(png_structp png_ptr, png_voidp ptr)
png_voidp
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_struct_2(type, NULL));
}
/* Allocate memory for a png_struct or a png_info. The malloc and
memset can be replaced by a single call to calloc() if this is thought
to improve performance noticably.*/
png_voidp
png_create_struct_2(int type, png_malloc_ptr malloc_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_size_t size;
png_voidp struct_ptr;
@@ -237,6 +304,15 @@ png_create_struct(int type)
else
return ((png_voidp)NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
#else
@@ -258,15 +334,37 @@ png_create_struct(int type)
void
png_destroy_struct(png_voidp struct_ptr)
{
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
}
/* Free memory allocated by a png_create_struct() call */
void
png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
if (struct_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
if(free_fn != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
(*(free_fn))(png_ptr, struct_ptr);
struct_ptr = NULL;
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
farfree(struct_ptr);
struct_ptr = NULL;
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(struct_ptr);
struct_ptr = NULL;
# else
free(struct_ptr);
struct_ptr = NULL;
# endif
#endif
}
@@ -280,13 +378,26 @@ png_destroy_struct(png_voidp struct_ptr)
have the ability to do that. */
png_voidp
PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
png_malloc(png_structp png_ptr, png_uint_32 size)
{
#ifndef PNG_USER_MEM_SUPPORTED
png_voidp ret;
#endif
if (png_ptr == NULL || size == 0)
return ((png_voidp)NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
else
return (png_malloc_default(png_ptr, size));
}
png_voidp
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
#endif /* PNG_USER_MEM_SUPPORTED */
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
png_error(png_ptr, "Cannot Allocate > 64K");
@@ -310,22 +421,38 @@ PNG_MALLOC(png_structp png_ptr, png_uint_32 size)
return (ret);
}
/* Free a pointer allocated by PNG_MALLOC(). In the default
configuration, png_ptr is not used, but is passed in case it
is needed. If ptr is NULL, return without taking any action. */
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
without taking any action. */
void
PNG_FREE(png_structp png_ptr, png_voidp ptr)
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
return;
#ifdef PNG_USER_MEM_SUPPORTED
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
ptr = NULL;
return;
}
else png_free_default(png_ptr, ptr);
}
void
png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
farfree(ptr);
ptr = NULL;
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(ptr);
ptr = NULL;
# else
free(ptr);
ptr = NULL;
# endif
#endif
}
@@ -358,3 +485,27 @@ png_memset_check (png_structp png_ptr, png_voidp s1, int value,
return (png_memset (s1, value, size));
}
#ifdef PNG_USER_MEM_SUPPORTED
/* This function is called when the application wants to use another method
* of allocating and freeing memory.
*/
void
png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
malloc_fn, png_free_ptr free_fn)
{
png_ptr->mem_ptr = mem_ptr;
png_ptr->malloc_fn = malloc_fn;
png_ptr->free_fn = free_fn;
}
/* This function returns a pointer to the mem_ptr associated with the user
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
png_voidp
png_get_mem_ptr(png_structp png_ptr)
{
return ((png_voidp)png_ptr->mem_ptr);
}
#endif /* PNG_USER_MEM_SUPPORTED */

36
src/png/pngpread.c
View File

@@ -1,16 +1,15 @@
/* pngpread.c - read a png file in push mode
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -78,8 +77,9 @@ png_process_some_data(png_structp png_ptr, png_infop info_ptr)
/* Read any remaining signature bytes from the stream and compare them with
* the correct PNG signature. It is possible that this routine is called
* with bytes already read from the signature, whether because they have been
* checked by the calling application, or from multiple calls to this routine.
* with bytes already read from the signature, either because they have been
* checked by the calling application, or because of multiple calls to this
* routine.
*/
void
png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
@@ -446,13 +446,13 @@ png_push_save_buffer(png_structp png_ptr)
{
if (png_ptr->save_buffer_ptr != png_ptr->save_buffer)
{
png_size_t i;
png_size_t i,istop;
png_bytep sp;
png_bytep dp;
istop = png_ptr->save_buffer_size;
for (i = 0, sp = png_ptr->save_buffer_ptr, dp = png_ptr->save_buffer;
i < png_ptr->save_buffer_size;
i++, sp++, dp++)
i < istop; i++, sp++, dp++)
{
*dp = *sp;
}
@@ -781,6 +781,7 @@ png_read_push_finish_row(png_structp png_ptr)
png_ptr->pass++;
if (png_ptr->pass >= 7)
break;
png_ptr->iwidth = (png_ptr->width +
png_pass_inc[png_ptr->pass] - 1 -
png_pass_start[png_ptr->pass]) /
@@ -789,18 +790,15 @@ png_read_push_finish_row(png_structp png_ptr)
png_ptr->irowbytes = ((png_ptr->iwidth *
png_ptr->pixel_depth + 7) >> 3) + 1;
if (!(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->transformations & PNG_INTERLACE)
break;
png_ptr->num_rows = (png_ptr->height +
png_pass_yinc[png_ptr->pass] - 1 -
png_pass_ystart[png_ptr->pass]) /
png_pass_yinc[png_ptr->pass];
if (!(png_ptr->num_rows))
continue;
}
if (png_ptr->transformations & PNG_INTERLACE)
break;
} while (png_ptr->iwidth == 0);
} while (png_ptr->iwidth == 0 || png_ptr->num_rows == 0);
}
}
@@ -1070,7 +1068,7 @@ png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
#endif
/* This function is called when we haven't found a handler for this
* chunk. In the future we will have code here which can handle
* chunk. In the future we will have code here that can handle
* user-defined callback functions for unknown chunks before they are
* ignored or cause an error. If there isn't a problem with the
* chunk itself (ie a bad chunk name or a critical chunk), the chunk
@@ -1117,7 +1115,7 @@ void
png_progressive_combine_row (png_structp png_ptr,
png_bytep old_row, png_bytep new_row)
{
if (new_row != NULL)
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
}

164
src/png/pngread.c
View File

@@ -1,31 +1,49 @@
/* pngread.c - read a PNG file
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file contains routines that an application calls directly to
* read a PNG file or stream.
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Create a PNG structure for reading, and allocate any memory needed. */
png_structp
png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr,
png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
warn_fn, NULL, NULL, NULL));
}
/* Alternate create PNG structure for reading, and allocate any memory needed. */
png_structp
png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
png_debug(1, "in png_create_read_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
(png_malloc_ptr)malloc_fn)) == NULL)
#else
if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
#endif
{
return (png_structp)NULL;
}
@@ -42,6 +60,11 @@ png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr,
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
@@ -82,7 +105,7 @@ png_create_read_struct(png_const_charp user_png_ver, voidp error_ptr,
}
/* Initialize PNG structure for reading, and allocate any memory needed.
This interface is depreciated in favour of the png_create_read_struct(),
This interface is deprecated in favour of the png_create_read_struct(),
and it will eventually disappear. */
void
png_read_init(png_structp png_ptr)
@@ -125,7 +148,7 @@ png_read_init(png_structp png_ptr)
/* Read the information before the actual image data. This has been
* changed in v0.90 to allow reading a file that already has the magic
* bytes read from the stream. You can tell libpng how many bytes have
* been read from the beginning of the stream (up to the maxumum of 8)
* been read from the beginning of the stream (up to the maximum of 8)
* via png_set_sig_bytes(), and we will only check the remaining bytes
* here. The application can then have access to the signature bytes we
* read if it is determined that this isn't a valid PNG file.
@@ -258,7 +281,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
/* Initialize palette, background, etc, after transformations
* are set, but before any reading takes place. This allows
* the user to obtail a gamma corrected palette, for example.
* the user to obtain a gamma-corrected palette, for example.
* If the user doesn't call this, we will do it ourselves.
*/
void
@@ -279,6 +302,38 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
/* save jump buffer and error functions */
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
/* check for transforms that have been set but were defined out */
#if defined(PNG_WRITE_INVERT_SUPPORTED) && !defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_READ_INVERT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_FILLER_SUPPORTED) && !defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_READ_FILLER_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACKSWAP_SUPPORTED) && !defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_READ_PACKSWAP_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_PACK_SUPPORTED) && !defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_READ_PACK_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_READ_SHIFT_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_BGR_SUPPORTED) && !defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_READ_BGR_SUPPORTED is not defined.");
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED) && !defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_READ_SWAP_SUPPORTED is not defined.");
#endif
}
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* if interlaced and we do not need a new row, combine row and return */
@@ -457,7 +512,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
/* Read one or more rows of image data. If the image is interlaced,
* and png_set_interlace_handling() has been called, the rows need to
* contain the contents of the rows from the previous pass. If the
* image has alpha or transparency, and png_handle_alpha() has been
* image has alpha or transparency, and png_handle_alpha()[*] has been
* called, the rows contents must be initialized to the contents of the
* screen.
*
@@ -474,6 +529,8 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
* also, but you may. If the image is not interlaced, or if you have
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
*/
void
@@ -488,29 +545,32 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
/* save jump buffer and error functions */
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep rptr;
png_bytep dptr;
png_bytep rptr = *rp++;
png_bytep dptr = *dp++;
if (rp != NULL)
rptr = *rp;
else
rptr = NULL;
if (dp != NULL)
dptr = *dp;
else
dptr = NULL;
png_read_row(png_ptr, rptr, dptr);
if (row != NULL)
}
else if(rp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep rptr = *rp;
png_read_row(png_ptr, rptr, NULL);
rp++;
if (display_row != NULL)
}
else if(dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep dptr = *dp;
png_read_row(png_ptr, NULL, dptr);
dp++;
}
}
/* Read the entire image. If the image has an alpha channel or a tRNS
* chunk, and you have called png_handle_alpha(), you will need to
* chunk, and you have called png_handle_alpha()[*], you will need to
* initialize the image to the current image that PNG will be overlaying.
* We set the num_rows again here, in case it was incorrectly set in
* png_read_start_row() by a call to png_read_update_info() or
@@ -518,11 +578,13 @@ png_read_rows(png_structp png_ptr, png_bytepp row,
* prior to either of these functions like it should have been. You can
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
* [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
*/
void
png_read_image(png_structp png_ptr, png_bytepp image)
{
png_uint_32 i;
png_uint_32 i,image_height;
int pass, j;
png_bytepp rp;
@@ -530,12 +592,13 @@ png_read_image(png_structp png_ptr, png_bytepp image)
/* save jump buffer and error functions */
pass = png_set_interlace_handling(png_ptr);
png_ptr->num_rows = png_ptr->height; /* Make sure this is set correctly */
image_height=png_ptr->height;
png_ptr->num_rows = image_height; /* Make sure this is set correctly */
for (j = 0; j < pass; j++)
{
rp = image;
for (i = 0; i < png_ptr->height; i++)
for (i = 0; i < image_height; i++)
{
png_read_row(png_ptr, *rp, NULL);
rp++;
@@ -647,6 +710,9 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
{
png_structp png_ptr = NULL;
png_infop info_ptr = NULL, end_info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn = NULL;
#endif /* PNG_USER_MEM_SUPPORTED */
png_debug(1, "in png_destroy_read_struct\n");
/* save jump buffer and error functions */
@@ -659,6 +725,10 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
if (end_info_ptr_ptr != NULL)
end_info_ptr = *end_info_ptr_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
if (info_ptr != NULL)
@@ -666,7 +736,12 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
png_free(png_ptr, info_ptr->text);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)info_ptr, free_fn);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
*info_ptr_ptr = (png_infop)NULL;
}
@@ -675,13 +750,21 @@ png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
png_free(png_ptr, end_info_ptr->text);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)end_info_ptr, free_fn);
#else
png_destroy_struct((png_voidp)end_info_ptr);
#endif
*end_info_ptr_ptr = (png_infop)NULL;
}
if (png_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)png_ptr, free_fn);
#else
png_destroy_struct((png_voidp)png_ptr);
#endif
*png_ptr_ptr = (png_structp)NULL;
}
}
@@ -694,6 +777,9 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
png_debug(1, "in png_read_destroy\n");
/* save jump buffer and error functions */
@@ -729,33 +815,39 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
if (png_ptr->gamma_16_table != NULL)
{
int i;
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_table[i]);
}
}
#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
png_free(png_ptr, png_ptr->gamma_16_table);
}
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
if (png_ptr->gamma_16_from_1 != NULL)
{
int i;
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
}
}
png_free(png_ptr, png_ptr->gamma_16_from_1);
}
if (png_ptr->gamma_16_to_1 != NULL)
{
int i;
for (i = 0; i < (1 << (8 - png_ptr->gamma_shift)); i++)
int istop = (1 << (8 - png_ptr->gamma_shift));
for (i = 0; i < istop; i++)
{
png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
}
}
png_free(png_ptr, png_ptr->gamma_16_to_1);
}
#endif
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
#endif /* PNG_TIME_RFC1123_SUPPORTED */
inflateEnd(&png_ptr->zstream);
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -770,12 +862,18 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
error_ptr = png_ptr->error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
png_memset(png_ptr, 0, sizeof (png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->error_ptr = error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
}

28
src/png/pngrio.c
View File

@@ -1,23 +1,22 @@
/* pngrio.c - functions for data input
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file provides a location for all input. Users which need
* special handling are expected to write a function which has the same
* arguments as this, and perform a similar function, but possibly has
* a different input method. Note that you shouldn't change this
* This file provides a location for all input. Users who need
* special handling are expected to write a function that has the same
* arguments as this and performs a similar function, but that possibly
* has a different input method. Note that you shouldn't change this
* function, but rather write a replacement function and then make
* libpng use it at run time with png_set_read_fn(...).
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Read the data from whatever input you are using. The default routine
reads from a file pointer. Note that this routine sometimes gets called
@@ -35,7 +34,7 @@ png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
}
#if !defined(PNG_NO_STDIO)
/* This is the function which does the actual reading of data. If you are
/* This is the function that does the actual reading of data. If you are
not reading from a standard C stream, you should create a replacement
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
@@ -114,10 +113,10 @@ png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
png_ptr - pointer to a png input data structure
io_ptr - pointer to user supplied structure containing info about
the input functions. May be NULL.
read_data_fn - pointer to a new input function which takes as it's
read_data_fn - pointer to a new input function that takes as its
arguments a pointer to a png_struct, a pointer to
a location where input data can be stored, and a 32-bit
unsigned int which is the number of bytes to be read.
unsigned int that is the number of bytes to be read.
To exit and output any fatal error messages the new write
function should call png_error(png_ptr, "Error msg"). */
void
@@ -136,7 +135,14 @@ png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
#endif
/* It is an error to write to a read device */
if (png_ptr->write_data_fn != NULL)
{
png_ptr->write_data_fn = NULL;
png_warning(png_ptr,
"It's an error to set both read_data_fn and write_data_fn in the ");
png_warning(png_ptr,
"same structure. Resetting write_data_fn to NULL.");
}
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_ptr->output_flush_fn = NULL;

1336
src/png/pngrtran.c
View File

File diff suppressed because it is too large Load Diff

341
src/png/pngrutil.c
View File

@@ -1,28 +1,25 @@
/* pngrutil.c - utilities to read a PNG file
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file contains routines which are only called from within
* This file contains routines that are only called from within
* libpng itself during the course of reading an image.
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
/* Grab an unsigned 32-bit integer from a buffer in big endian format. */
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
png_uint_32
png_get_uint_32(png_bytep buf)
{
png_uint_32 i;
i = ((png_uint_32)(*buf) << 24) +
png_uint_32 i = ((png_uint_32)(*buf) << 24) +
((png_uint_32)(*(buf + 1)) << 16) +
((png_uint_32)(*(buf + 2)) << 8) +
(png_uint_32)(*(buf + 3));
@@ -31,15 +28,13 @@ png_get_uint_32(png_bytep buf)
}
#if defined(PNG_READ_pCAL_SUPPORTED)
/* Grab a signed 32-bit integer from a buffer in big endian format. The
/* Grab a signed 32-bit integer from a buffer in big-endian format. The
* data is stored in the PNG file in two's complement format, and it is
* assumed that the machine format for signed integers is the same. */
png_int_32
png_get_int_32(png_bytep buf)
{
png_int_32 i;
i = ((png_int_32)(*buf) << 24) +
png_int_32 i = ((png_int_32)(*buf) << 24) +
((png_int_32)(*(buf + 1)) << 16) +
((png_int_32)(*(buf + 2)) << 8) +
(png_int_32)(*(buf + 3));
@@ -48,13 +43,11 @@ png_get_int_32(png_bytep buf)
}
#endif /* PNG_READ_pCAL_SUPPORTED */
/* Grab an unsigned 16-bit integer from a buffer in big endian format. */
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
png_uint_16
png_get_uint_16(png_bytep buf)
{
png_uint_16 i;
i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
(png_uint_16)(*(buf + 1)));
return (i);
@@ -76,15 +69,16 @@ png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
int
png_crc_finish(png_structp png_ptr, png_uint_32 skip)
{
png_uint_32 i;
png_size_t i;
png_size_t istop = png_ptr->zbuf_size;
for (i = skip; i > (png_uint_32)png_ptr->zbuf_size; i -= png_ptr->zbuf_size)
for (i = (png_size_t)skip; i > istop; i -= istop)
{
png_crc_read(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
}
if (i)
{
png_crc_read(png_ptr, png_ptr->zbuf, (png_size_t)i);
png_crc_read(png_ptr, png_ptr->zbuf, i);
}
if (png_crc_error(png_ptr))
@@ -258,20 +252,6 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->mode |= PNG_HAVE_PLTE;
#if defined (PNG_READ_tRNS_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
{
if (png_ptr->num_trans > png_ptr->num_palette)
{
png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
png_ptr->num_trans = png_ptr->num_palette;
}
}
}
#endif
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
@@ -349,6 +329,21 @@ png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_ptr->palette = palette;
png_ptr->num_palette = (png_uint_16)num;
png_set_PLTE(png_ptr, info_ptr, palette, num);
#if defined (PNG_READ_tRNS_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
{
if (png_ptr->num_trans > png_ptr->num_palette)
{
png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
png_ptr->num_trans = png_ptr->num_palette;
}
}
}
#endif
}
void
@@ -429,7 +424,7 @@ png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_STDIO
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr, "igamma = %lu\n", igamma);
#endif
return;
@@ -501,6 +496,9 @@ png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
else
{
png_ptr->sig_bit.gray = buf[0];
png_ptr->sig_bit.red = buf[0];
png_ptr->sig_bit.green = buf[0];
png_ptr->sig_bit.blue = buf[0];
png_ptr->sig_bit.alpha = buf[1];
}
png_set_sBIT(png_ptr, info_ptr, &(png_ptr->sig_bit));
@@ -629,7 +627,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
#ifndef PNG_NO_STDIO
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
white_x, white_y, red_x, red_y);
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
@@ -698,7 +696,7 @@ png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_STDIO
#ifndef PNG_NO_CONSOLE_IO
fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
#endif
}
@@ -758,6 +756,12 @@ png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_crc_finish(png_ptr, length);
return;
}
if (length == 0)
{
png_warning(png_ptr, "Zero length tRNS chunk");
png_crc_finish(png_ptr, length);
return;
}
png_ptr->trans = (png_bytep)png_malloc(png_ptr, length);
png_ptr->flags |= PNG_FLAG_FREE_TRANS;
@@ -1075,7 +1079,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
purpose[slength] = 0x00; /* null terminate the last string */
png_debug(3, "Finding end of pCAL purpose string\n");
for (buf = purpose; *buf != '\0'; buf++)
for (buf = purpose; *buf; buf++)
/* empty loop */ ;
endptr = purpose + slength;
@@ -1113,7 +1117,7 @@ png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
}
for (buf = units; *buf != 0x00; buf++)
for (buf = units; *buf; buf++)
/* Empty loop to move past the units string. */ ;
png_debug(3, "Allocating pCAL parameters array\n");
@@ -1465,13 +1469,13 @@ png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
}
}
/* Combines the row recently read in with the previous row.
This routine takes care of alpha and transparency if requested.
/* Combines the row recently read in with the existing pixels in the
row. This routine takes care of alpha and transparency if requested.
This routine also handles the two methods of progressive display
of interlaced images, depending on the mask value.
The mask value describes which pixels are to be combined with
the row. The pattern always repeats every 8 pixels, so just 8
bits are needed. A one indicates the pixels is to be combined,
bits are needed. A one indicates the pixel is to be combined,
a zero indicates the pixel is to be skipped. This is in addition
to any alpha or transparency value associated with the pixel. If
you want all pixels to be combined, pass 0xff (255) in mask. */
@@ -1492,16 +1496,14 @@ png_combine_row(png_structp png_ptr, png_bytep row,
{
case 1:
{
png_bytep sp;
png_bytep dp;
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_inc, s_start, s_end;
int m;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
sp = png_ptr->row_buf + 1;
dp = row;
m = 0x80;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
@@ -1519,7 +1521,7 @@ png_combine_row(png_structp png_ptr, png_bytep row,
shift = s_start;
for (i = 0; i < png_ptr->width; i++)
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
@@ -1548,17 +1550,15 @@ png_combine_row(png_structp png_ptr, png_bytep row,
}
case 2:
{
png_bytep sp;
png_bytep dp;
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_start, s_end, s_inc;
int m;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
int value;
sp = png_ptr->row_buf + 1;
dp = row;
m = 0x80;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
@@ -1576,7 +1576,7 @@ png_combine_row(png_structp png_ptr, png_bytep row,
shift = s_start;
for (i = 0; i < png_ptr->width; i++)
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
@@ -1602,17 +1602,15 @@ png_combine_row(png_structp png_ptr, png_bytep row,
}
case 4:
{
png_bytep sp;
png_bytep dp;
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
int s_start, s_end, s_inc;
int m;
int m = 0x80;
int shift;
png_uint_32 i;
png_uint_32 row_width = png_ptr->width;
int value;
sp = png_ptr->row_buf + 1;
dp = row;
m = 0x80;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
{
@@ -1629,7 +1627,7 @@ png_combine_row(png_structp png_ptr, png_bytep row,
}
shift = s_start;
for (i = 0; i < png_ptr->width; i++)
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
@@ -1655,18 +1653,15 @@ png_combine_row(png_structp png_ptr, png_bytep row,
}
default:
{
png_bytep sp;
png_bytep dp;
png_size_t pixel_bytes;
png_bytep sp = png_ptr->row_buf + 1;
png_bytep dp = row;
png_size_t pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
png_uint_32 i;
png_byte m;
png_uint_32 row_width = png_ptr->width;
png_byte m = 0x80;
pixel_bytes = (png_ptr->row_info.pixel_depth >> 3);
sp = png_ptr->row_buf + 1;
dp = row;
m = 0x80;
for (i = 0; i < png_ptr->width; i++)
for (i = 0; i < row_width; i++)
{
if (m & mask)
{
@@ -1703,15 +1698,15 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
{
case 1:
{
png_bytep sp, dp;
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 3);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 3);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_byte v;
png_uint_32 i;
int j;
sp = row + (png_size_t)((row_info->width - 1) >> 3);
dp = row + (png_size_t)((final_width - 1) >> 3);
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
@@ -1731,10 +1726,10 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
s_inc = 1;
}
for (i = row_info->width; i; i--)
for (i = 0; i < row_info->width; i++)
{
v = (png_byte)((*sp >> sshift) & 0x1);
for (j = 0; j < png_pass_inc[pass]; j++)
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
@@ -1758,13 +1753,13 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
}
case 2:
{
png_bytep sp, dp;
png_bytep sp = row + (png_uint_32)((row_info->width - 1) >> 2);
png_bytep dp = row + (png_uint_32)((final_width - 1) >> 2);
int sshift, dshift;
int s_start, s_end, s_inc;
int jstop = png_pass_inc[pass];
png_uint_32 i;
sp = row + (png_uint_32)((row_info->width - 1) >> 2);
dp = row + (png_uint_32)((final_width - 1) >> 2);
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
@@ -1784,13 +1779,13 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
s_inc = 2;
}
for (i = row_info->width; i; i--)
for (i = 0; i < row_info->width; i++)
{
png_byte v;
int j;
v = (png_byte)((*sp >> sshift) & 0x3);
for (j = 0; j < png_pass_inc[pass]; j++)
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
@@ -1814,13 +1809,13 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
}
case 4:
{
png_bytep sp, dp;
png_bytep sp = row + (png_size_t)((row_info->width - 1) >> 1);
png_bytep dp = row + (png_size_t)((final_width - 1) >> 1);
int sshift, dshift;
int s_start, s_end, s_inc;
png_uint_32 i;
int jstop = png_pass_inc[pass];
sp = row + (png_size_t)((row_info->width - 1) >> 1);
dp = row + (png_size_t)((final_width - 1) >> 1);
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
@@ -1840,13 +1835,12 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
s_inc = 4;
}
for (i = row_info->width; i; i--)
for (i = 0; i < row_info->width; i++)
{
png_byte v;
png_byte v = (png_byte)((*sp >> sshift) & 0xf);
int j;
v = (png_byte)((*sp >> sshift) & 0xf);
for (j = 0; j < png_pass_inc[pass]; j++)
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0xf0f >> (4 - dshift)) & 0xff);
*dp |= (png_byte)(v << dshift);
@@ -1870,21 +1864,19 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
}
default:
{
png_bytep sp, dp;
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
int jstop = png_pass_inc[pass];
png_uint_32 i;
png_size_t pixel_bytes;
pixel_bytes = (row_info->pixel_depth >> 3);
sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
for (i = row_info->width; i; i--)
for (i = 0; i < row_info->width; i++)
{
png_byte v[8];
int j;
png_memcpy(v, sp, pixel_bytes);
for (j = 0; j < png_pass_inc[pass]; j++)
for (j = 0; j < jstop; j++)
{
png_memcpy(dp, v, pixel_bytes);
dp -= pixel_bytes;
@@ -1916,97 +1908,112 @@ png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
case PNG_FILTER_VALUE_SUB:
{
png_uint_32 i;
int bpp;
png_bytep rp;
png_bytep lp;
png_uint_32 istop = row_info->rowbytes;
png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
png_bytep rp = row + bpp;
png_bytep lp = row;
bpp = (row_info->pixel_depth + 7) / 8;
for (i = (png_uint_32)bpp, rp = row + bpp, lp = row;
i < row_info->rowbytes; i++, rp++, lp++)
for (i = bpp; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*lp)) & 0xff);
*rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_UP:
{
png_uint_32 i;
png_bytep rp;
png_bytep pp;
png_uint_32 istop = row_info->rowbytes;
png_bytep rp = row;
png_bytep pp = prev_row;
for (i = 0, rp = row, pp = prev_row;
i < row_info->rowbytes; i++, rp++, pp++)
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp)) & 0xff);
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_AVG:
{
png_uint_32 i;
int bpp;
png_bytep rp;
png_bytep pp;
png_bytep lp;
png_bytep rp = row;
png_bytep pp = prev_row;
png_bytep lp = row;
png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
png_uint_32 istop = row_info->rowbytes - bpp;
bpp = (row_info->pixel_depth + 7) / 8;
for (i = 0, rp = row, pp = prev_row;
i < (png_uint_32)bpp; i++, rp++, pp++)
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) +
((int)(*pp) / 2)) & 0xff);
((int)(*pp++) / 2)) & 0xff);
rp++;
}
for (lp = row; i < row_info->rowbytes; i++, rp++, lp++, pp++)
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) +
(int)(*pp + *lp) / 2) & 0xff);
(int)(*pp++ + *lp++) / 2) & 0xff);
rp++;
}
break;
}
case PNG_FILTER_VALUE_PAETH:
{
int bpp;
png_uint_32 i;
png_bytep rp;
png_bytep pp;
png_bytep lp;
png_bytep cp;
png_bytep rp = row;
png_bytep pp = prev_row;
png_bytep lp = row;
png_bytep cp = prev_row;
png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
png_uint_32 istop=row_info->rowbytes - bpp;
bpp = (row_info->pixel_depth + 7) / 8;
for (i = 0, rp = row, pp = prev_row,
lp = row - bpp, cp = prev_row - bpp;
i < row_info->rowbytes; i++, rp++, pp++, lp++, cp++)
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
for (i = 0; i < istop; i++) /* use leftover rp,pp */
{
int a, b, c, pa, pb, pc, p;
b = *pp;
if (i >= (png_uint_32)bpp)
{
c = *cp;
a = *lp;
}
else
{
a = c = 0;
}
p = a + b - c;
pa = abs(p - a);
pb = abs(p - b);
pc = abs(p - c);
a = *lp++;
b = *pp++;
c = *cp++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
/*
if (pa <= pb && pa <= pc)
p = a;
else if (pb <= pc)
p = b;
else
p = c;
*/
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
*rp = (png_byte)(((int)(*rp) + p) & 0xff);
rp++;
}
break;
}
default:
png_error(png_ptr, "Bad adaptive filter type");
png_warning(png_ptr, "Ignoring bad adaptive filter type");
*row=0;
break;
}
}
@@ -2044,7 +2051,7 @@ png_read_finish_row(png_structp png_ptr)
if (!(png_ptr->num_rows))
continue;
}
if (png_ptr->transformations & PNG_INTERLACE)
else /* if (png_ptr->transformations & PNG_INTERLACE) */
break;
} while (png_ptr->iwidth == 0);
@@ -2118,7 +2125,7 @@ void
png_read_start_row(png_structp png_ptr)
{
int max_pixel_depth;
png_uint_32 rowbytes;
png_uint_32 row_bytes;
png_debug(1, "in png_read_start_row\n");
png_ptr->zstream.avail_in = 0;
@@ -2136,10 +2143,10 @@ png_read_start_row(png_structp png_ptr)
png_pass_start[png_ptr->pass]) /
png_pass_inc[png_ptr->pass];
rowbytes = ((png_ptr->iwidth *
row_bytes = ((png_ptr->iwidth *
(png_uint_32)png_ptr->pixel_depth + 7) >> 3) +1;
png_ptr->irowbytes = (png_size_t)rowbytes;
if((png_uint_32)png_ptr->irowbytes != rowbytes)
png_ptr->irowbytes = (png_size_t)row_bytes;
if((png_uint_32)png_ptr->irowbytes != row_bytes)
png_error(png_ptr, "Rowbytes overflow in png_read_start_row");
}
else
@@ -2186,27 +2193,47 @@ png_read_start_row(png_structp png_ptr)
#if defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & (PNG_FILLER))
{
if (max_pixel_depth < 32)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
max_pixel_depth = 32;
else if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY)
{
if (max_pixel_depth <= 8)
max_pixel_depth = 16;
else
max_pixel_depth = 32;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
if (max_pixel_depth <= 32)
max_pixel_depth = 32;
else
max_pixel_depth = 64;
}
}
#endif
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
if (png_ptr->transformations & PNG_GRAY_TO_RGB)
{
if ((png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
if (
#if defined(PNG_READ_EXPAND_SUPPORTED)
(png_ptr->num_trans && (png_ptr->transformations & PNG_EXPAND)) ||
#endif
#if defined(PNG_READ_FILLER_SUPPORTED)
(png_ptr->transformations & (PNG_FILLER)) ||
#endif
png_ptr->color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
{
if (max_pixel_depth <= 16)
max_pixel_depth = 32;
else if (max_pixel_depth <= 32)
else
max_pixel_depth = 64;
}
else
{
if (max_pixel_depth <= 8)
max_pixel_depth = 24;
else if (max_pixel_depth <= 16)
else
max_pixel_depth = 48;
}
}
@@ -2214,16 +2241,16 @@ png_read_start_row(png_structp png_ptr)
/* align the width on the next larger 8 pixels. Mainly used
for interlacing */
rowbytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
/* calculate the maximum bytes needed, adding a byte and a pixel
for safety sake */
rowbytes = ((rowbytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
for safety's sake */
row_bytes = ((row_bytes * (png_uint_32)max_pixel_depth + 7) >> 3) +
1 + ((max_pixel_depth + 7) >> 3);
#ifdef PNG_MAX_MALLOC_64K
if (rowbytes > (png_uint_32)65536L)
if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, rowbytes);
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, row_bytes);
#ifdef PNG_MAX_MALLOC_64K
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)

10
src/png/pngset.c
View File

@@ -1,12 +1,11 @@
/* pngset.c - storage of image information into info struct
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* The functions here are used during reads to store data from the file
* into the info struct, and during writes to store application data
@@ -15,7 +14,7 @@
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
void
@@ -108,13 +107,14 @@ png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
/* check for overflow */
rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
info_ptr->rowbytes = info_ptr->width * rowbytes_per_pixel;
if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
{
png_warning(png_ptr,
"Width too large to process image data; rowbytes will overflow.");
info_ptr->rowbytes = (png_size_t)0;
}
else
info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
}
#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)

161
src/png/pngtest.c
View File

@@ -1,12 +1,11 @@
/* pngtest.c - a simple test program to test libpng
*
* libpng 1.0.1
* libpng 1.0.3 -January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This program reads in a PNG image, writes it out again, and then
* compares the two files. If the files are identical, this shows that
@@ -14,9 +13,9 @@
* properly. It does not currently test all of the transforms, although
* it probably should.
*
* The program will fail in certain legitimate cases:
* The program will report "FAIL" in certain legitimate cases:
* 1) when the compression level or filter selection method is changed.
* 2) when the chunk size is smaller than 8K.
* 2) when the chunk size is not 8K.
* 3) unknown ancillary chunks exist in the input file.
* 4) others not listed here...
* In these cases, it is best to check with another tool such as "pngcheck"
@@ -24,7 +23,8 @@
*
* If a filename is given on the command-line, then this file is used
* for the input, rather than the default "pngtest.png". This allows
* testing a wide variety of files easily.
* testing a wide variety of files easily. You can also test a number
* of files at once by typing "pngtest -m file1.png file2.png ..."
*/
#include <stdio.h>
@@ -35,7 +35,12 @@
#define PNG_DEBUG 0
#endif
#include "../png/png.h"
#include "png.h"
#if defined(PNG_TIME_RFC1123_SUPPORTED)
static int tIME_chunk_present=0;
static char tIME_string[30] = "no tIME chunk present in file";
#endif /* PNG_TIME_RFC1123_SUPPORTED */
int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
@@ -81,12 +86,12 @@ write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
/* example of using user transform callback (we don't transform anything,
but merely count the black pixels) */
but merely count the zero samples) */
static png_uint_32 black_pixels;
static png_uint_32 zero_samples;
void
count_black_pixels(png_structp png_ptr, png_row_infop row_info, png_bytep data)
count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
png_bytep dp = data;
if(png_ptr == NULL)return;
@@ -100,60 +105,66 @@ count_black_pixels(png_structp png_ptr, png_row_infop row_info, png_bytep data)
* png_byte pixel_depth bits per pixel (depth*channels)
*/
/* counts the number of black pixels (or zero pixels if color_type is 3 */
/* counts the number of zero samples (or zero pixels if color_type is 3 */
if(row_info->color_type == 0 || row_info->color_type == 3)
{
int pos=0;
png_uint_32 n;
for (n=0; n<row_info->width; n++)
png_uint_32 n, nstop;
for (n=0, nstop=row_info->width; n<nstop; n++)
{
if(row_info->bit_depth == 1)
if(((*dp << pos++ )& 0x80) == 0) black_pixels++;
{
if(((*dp << pos++ )& 0x80) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
dp++;
}
}
if(row_info->bit_depth == 2)
if(((*dp << (pos+=2))& 0xc0) == 0) black_pixels++;
{
if(((*dp << (pos+=2))& 0xc0) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
dp++;
}
}
if(row_info->bit_depth == 4)
if(((*dp << (pos+=4))& 0xf0) == 0) black_pixels++;
{
if(((*dp << (pos+=4))& 0xf0) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
dp++;
}
}
if(row_info->bit_depth == 8)
if(*dp++ == 0) black_pixels++;
if(*dp++ == 0) zero_samples++;
if(row_info->bit_depth == 16)
{
if((*dp | *(dp+1)) == 0) black_pixels++;
if((*dp | *(dp+1)) == 0) zero_samples++;
dp+=2;
}
}
}
else /* other color types */
{
png_uint_32 n;
png_uint_32 n, nstop;
int channel;
int color_channels = row_info->channels;
if(row_info->color_type > 3)color_channels--;
for (n=0; n<row_info->width; n++)
for (n=0, nstop=row_info->width; n<nstop; n++)
{
for (channel = 0; channel < color_channels; channel++)
{
if(row_info->bit_depth == 8)
if(*dp++ == 0) black_pixels++;
if(*dp++ == 0) zero_samples++;
if(row_info->bit_depth == 16)
{
if((*dp | *(dp+1)) == 0) black_pixels++;
if((*dp | *(dp+1)) == 0) zero_samples++;
dp+=2;
}
}
@@ -174,7 +185,7 @@ static int wrote_question = 0;
/* START of code to validate stdio-free compilation */
/* These copies of the default read/write functions come from pngrio.c and */
/* pngwio.c. They allow "don't include stdio" testing of the library. */
/* This is the function which does the actual reading of data. If you are
/* This is the function that does the actual reading of data. If you are
not reading from a standard C stream, you should create a replacement
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
@@ -256,7 +267,7 @@ png_default_flush(png_structp png_ptr)
}
#endif
/* This is the function which does the actual writing of data. If you are
/* This is the function that does the actual writing of data. If you are
not writing to a standard C stream, you should create a replacement
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
@@ -346,18 +357,14 @@ static void
png_default_error(png_structp png_ptr, png_const_charp message)
{
png_default_warning(png_ptr, message);
/* We can return because png_error calls the default handler which is
* actually ok in this case. */
/* We can return because png_error calls the default handler, which is
* actually OK in this case. */
}
#endif /* PNG_NO_STDIO */
/* END of code to validate stdio-free compilation */
/* START of code to validate memory allocation and deallocation */
#ifdef PNGTEST_MEMORY_DEBUG
/* Borland DOS special memory handler */
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
ERROR - memory debugging is not supported on this platform
#else
#ifdef PNG_USER_MEM_SUPPORTED
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
@@ -384,23 +391,23 @@ extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
png_voidp ptr));
png_voidp
png_malloc(png_structp png_ptr, png_uint_32 size) {
if (png_ptr == NULL) {
fprintf(STDERR, "NULL pointer to memory allocator\n");
return (NULL);
}
png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
/* png_malloc has already tested for NULL; png_create_struct calls
png_debug_malloc directly, with png_ptr == NULL which is OK */
if (size == 0)
return (png_voidp)(NULL);
/* This calls the library allocator twice, once to get the requested
buffer and once to get a new free list entry. */
{
memory_infop pinfo = png_debug_malloc(png_ptr, sizeof *pinfo);
memory_infop pinfo = png_malloc_default(png_ptr, sizeof *pinfo);
pinfo->size = size;
current_allocation += size;
if (current_allocation > maximum_allocation)
maximum_allocation = current_allocation;
pinfo->pointer = png_debug_malloc(png_ptr, size);
pinfo->pointer = png_malloc_default(png_ptr, size);
pinfo->next = pinformation;
pinformation = pinfo;
/* Make sure the caller isn't assuming zeroed memory. */
@@ -411,10 +418,10 @@ png_malloc(png_structp png_ptr, png_uint_32 size) {
/* Free a pointer. It is removed from the list at the same time. */
void
png_free(png_structp png_ptr, png_voidp ptr)
png_debug_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to memory allocator\n");
fprintf(STDERR, "NULL pointer to png_debug_free.\n");
if (ptr == 0) {
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
@@ -433,9 +440,9 @@ png_free(png_structp png_ptr, png_voidp ptr)
if (current_allocation < 0)
fprintf(STDERR, "Duplicate free of memory\n");
/* We must free the list element too, but first kill
the memory which is to be freed. */
the memory that is to be freed. */
memset(ptr, 0x55, pinfo->size);
png_debug_free(png_ptr, pinfo);
png_free_default(png_ptr, pinfo);
break;
}
if (pinfo->next == NULL) {
@@ -447,10 +454,9 @@ png_free(png_structp png_ptr, png_voidp ptr)
}
/* Finally free the data. */
png_debug_free(png_ptr, ptr);
png_free_default(png_ptr, ptr);
}
#endif /* Not Borland DOS special memory handler */
#endif
#endif /* PNG_USER_MEM_SUPPORTED */
/* END of code to test memory allocation/deallocation */
/* Test one file */
@@ -487,14 +493,26 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
png_debug(0, "Allocating read and write structures\n");
#ifdef PNG_USER_MEM_SUPPORTED
read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL);
#endif
#if defined(PNG_NO_STDIO)
png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error,
png_default_warning);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
(png_error_ptr)NULL, (png_error_ptr)NULL);
#endif
#if defined(PNG_NO_STDIO)
png_set_error_fn(write_ptr, (png_voidp)inname, png_default_error,
png_default_warning);
@@ -503,6 +521,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
read_info_ptr = png_create_info_struct(read_ptr);
write_info_ptr = png_create_info_struct(write_ptr);
end_info_ptr = png_create_info_struct(read_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
#endif
png_debug(0, "Setting jmpbuf for read struct\n");
#ifdef USE_FAR_KEYWORD
@@ -518,10 +538,12 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
fclose(fpout);
return (1);
}
#ifdef USE_FAR_KEYWORD
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
png_debug(0, "Setting jmpbuf for write struct\n");
#ifdef USE_FAR_KEYWORD
png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
if (setjmp(jmpbuf))
#else
if (setjmp(write_ptr->jmpbuf))
@@ -534,10 +556,10 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
fclose(fpout);
return (1);
}
#ifdef USE_FAR_KEYWORD
png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
png_debug(0, "Initializing input and output streams\n");
#if !defined(PNG_NO_STDIO)
png_init_io(read_ptr, fpin);
@@ -563,8 +585,8 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
}
# if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
black_pixels=0;
png_set_write_user_transform_fn(write_ptr, count_black_pixels);
zero_samples=0;
png_set_write_user_transform_fn(write_ptr, count_zero_samples);
# endif
png_debug(0, "Reading info struct\n");
@@ -713,6 +735,13 @@ test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
if (png_get_tIME(read_ptr, read_info_ptr, &mod_time))
{
png_set_tIME(write_ptr, write_info_ptr, mod_time);
#if defined(PNG_TIME_RFC1123_SUPPORTED)
/* we have to use png_strcpy instead of "=" because the string
pointed to by png_convert_to_rfc1123() gets free'ed before
we use it */
png_strcpy(tIME_string,png_convert_to_rfc1123(read_ptr, mod_time));
tIME_chunk_present++;
#endif /* PNG_TIME_RFC1123_SUPPORTED */
}
}
#endif
@@ -871,6 +900,7 @@ main(int argc, char *argv[])
fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION);
fprintf(STDERR,"%s",png_get_copyright(NULL));
/* Do some consistency checking on the memory allocation settings, I'm
not sure this matters, but it is nice to know, the first of these
@@ -938,7 +968,7 @@ main(int argc, char *argv[])
if (multiple)
{
int i;
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
int allocation_now = current_allocation;
#endif
for (i=2; i<argc; ++i)
@@ -947,16 +977,24 @@ main(int argc, char *argv[])
fprintf(STDERR, "Testing %s:",argv[i]);
kerror = test_one_file(argv[i], outname);
if (kerror == 0)
{
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
fprintf(STDERR, " PASS (%lu black pixels)\n",black_pixels);
fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
else {
#if defined(PNG_TIME_RFC1123_SUPPORTED)
if(tIME_chunk_present != 0)
fprintf(STDERR, " tIME = %s\n",tIME_string);
tIME_chunk_present = 0;
#endif /* PNG_TIME_RFC1123_SUPPORTED */
}
else
{
fprintf(STDERR, " FAIL\n");
ierror += kerror;
}
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
@@ -972,7 +1010,7 @@ main(int argc, char *argv[])
}
#endif
}
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
maximum_allocation);
#endif
@@ -982,7 +1020,7 @@ main(int argc, char *argv[])
int i;
for (i=0; i<3; ++i) {
int kerror;
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
int allocation_now = current_allocation;
#endif
if (i == 1) status_dots_requested = 1;
@@ -993,11 +1031,17 @@ main(int argc, char *argv[])
if(kerror == 0)
{
if(verbose == 1 || i == 2)
{
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
fprintf(STDERR, " PASS (%lu black pixels)\n",black_pixels);
fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
if(tIME_chunk_present != 0)
fprintf(STDERR, " tIME = %s\n",tIME_string);
#endif /* PNG_TIME_RFC1123_SUPPORTED */
}
}
else
{
@@ -1006,7 +1050,7 @@ main(int argc, char *argv[])
fprintf(STDERR, " FAIL\n");
ierror += kerror;
}
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
@@ -1022,7 +1066,7 @@ main(int argc, char *argv[])
}
#endif
}
#ifdef PNGTEST_MEMORY_DEBUG
#ifdef PNG_USER_MEM_SUPPORTED
fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
maximum_allocation);
#endif
@@ -1034,3 +1078,4 @@ main(int argc, char *argv[])
fprintf(STDERR, "libpng FAILS test\n");
return (int)(ierror != 0);
}

137
src/png/pngtrans.c
View File

@@ -1,16 +1,15 @@
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* turn on bgr to rgb mapping */
@@ -87,8 +86,8 @@ png_set_interlace_handling(png_structp png_ptr)
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
/* Add a filler byte on read, or remove a filler or alpha byte on write.
* The filler type has changed in v0.95 to allow future 2-byte fillers
* for 48-bit input data, as well as avoiding problems with some compilers
* which don't like bytes as parameters.
* for 48-bit input data, as well as to avoid problems with some compilers
* that don't like bytes as parameters.
*/
void
png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
@@ -101,11 +100,23 @@ png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
else
png_ptr->flags &= ~PNG_FLAG_FILLER_AFTER;
/* This should probably go in the "do_filler" routine */
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB && png_ptr->bit_depth == 8)
/* This should probably go in the "do_filler" routine.
* I attempted to do that in libpng-1.0.1a but that caused problems
* so I restored it in libpng-1.0.2a
*/
if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
{
png_ptr->usr_channels = 4;
}
/* Also I added this in libpng-1.0.2a (what happens when we expand
* a less-than-8-bit grayscale to GA? */
if (png_ptr->color_type == PNG_COLOR_TYPE_GRAY && png_ptr->bit_depth >= 8)
{
png_ptr->usr_channels = 2;
}
}
#endif
@@ -137,7 +148,7 @@ png_set_invert_mono(png_structp png_ptr)
png_ptr->transformations |= PNG_INVERT_MONO;
}
/* invert monocrome grayscale data */
/* invert monochrome grayscale data */
void
png_do_invert(png_row_infop row_info, png_bytep row)
{
@@ -148,12 +159,14 @@ png_do_invert(png_row_infop row_info, png_bytep row)
#endif
row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp;
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
for (i = 0, rp = row; i < row_info->rowbytes; i++, rp++)
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(~(*rp));
rp++;
}
}
}
@@ -171,15 +184,13 @@ png_do_swap(png_row_infop row_info, png_bytep row)
#endif
row_info->bit_depth == 16)
{
png_bytep rp;
png_byte t;
png_bytep rp = row;
png_uint_32 i;
png_uint_32 istop= row_info->width * row_info->channels;
for (i = 0, rp = row;
i < row_info->width * row_info->channels;
i++, rp += 2)
for (i = 0; i < istop; i++, rp += 2)
{
t = *rp;
png_byte t = *rp;
*rp = *(rp + 1);
*(rp + 1) = t;
}
@@ -338,6 +349,11 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
if (row_info->color_type == PNG_COLOR_TYPE_RGB ||
row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
*/
png_bytep sp=row;
png_bytep dp=row;
png_uint_32 row_width=row_info->width;
png_uint_32 i;
if (row_info->channels == 4)
{
if (row_info->bit_depth == 8)
@@ -345,10 +361,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from RGBX or RGBA to RGB */
if (flags & PNG_FLAG_FILLER_AFTER)
{
png_bytep sp, dp;
png_uint_32 i;
for (i = 1, sp = row + 4, dp = row + 3; i < row_info->width; i++)
dp+=3; sp+=4;
for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
@@ -359,10 +373,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from XRGB or ARGB to RGB */
else
{
png_bytep sp, dp;
png_uint_32 i;
for (i = 0, sp = row, dp = row; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
@@ -371,17 +382,15 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 24;
row_info->rowbytes = row_info->width * 3;
row_info->rowbytes = row_width * 3;
}
else /* if (row_info->bit_depth == 16) */
{
if (flags & PNG_FLAG_FILLER_AFTER)
{
png_bytep sp, dp;
png_uint_32 i;
/* This converts from RRGGBBXX or RRGGBBAA to RRGGBB */
for (i = 1, sp = row + 8, dp = row + 6; i < row_info->width; i++)
sp += 8; dp += 6;
for (i = 1; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
@@ -399,17 +408,15 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
else
{
png_bytep sp, dp;
png_uint_32 i;
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
for (i = 0, sp = row + 2, dp = row; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
/* This could be (although memcpy is probably slower):
png_memcpy(dp, sp, 6);
sp += 8;
dp += 6;
*/
sp+=2;
*dp++ = *sp++;
*dp++ = *sp++;
*dp++ = *sp++;
@@ -419,9 +426,10 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 48;
row_info->rowbytes = row_info->width * 6;
row_info->rowbytes = row_width * 6;
}
row_info->channels = 3;
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
}
/*
else if (row_info->color_type == PNG_COLOR_TYPE_GRAY ||
@@ -434,10 +442,7 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from GX or GA to G */
if (flags & PNG_FLAG_FILLER_AFTER)
{
png_bytep sp, dp;
png_uint_32 i;
for (i = 1, sp = row + 2, dp = row + 1; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
*dp++ = *sp++;
sp++;
@@ -446,27 +451,22 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
/* This converts from XG or AG to G */
else
{
png_bytep sp, dp;
png_uint_32 i;
for (i = 0, sp = row, dp = row; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
sp++;
*dp++ = *sp++;
}
}
row_info->pixel_depth = 8;
row_info->rowbytes = row_info->width;
row_info->rowbytes = row_width;
}
else /* if (row_info->bit_depth == 16) */
{
if (flags & PNG_FLAG_FILLER_AFTER)
{
png_bytep sp, dp;
png_uint_32 i;
/* This converts from GGXX or GGAA to GG */
for (i = 1, sp = row + 4, dp = row + 2; i < row_info->width; i++)
sp += 4; dp += 2;
for (i = 1; i < row_width; i++)
{
*dp++ = *sp++;
*dp++ = *sp++;
@@ -475,11 +475,8 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
else
{
png_bytep sp, dp;
png_uint_32 i;
/* This converts from XXGG or AAGG to GG */
for (i = 0, sp = row, dp = row; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
sp += 2;
*dp++ = *sp++;
@@ -487,9 +484,10 @@ png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
}
}
row_info->pixel_depth = 16;
row_info->rowbytes = row_info->width * 2;
row_info->rowbytes = row_width * 2;
}
row_info->channels = 1;
row_info->color_type &= ~PNG_COLOR_MASK_ALPHA;
}
}
}
@@ -507,17 +505,17 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
png_uint_32 row_width = row_info->width;
if (row_info->bit_depth == 8)
{
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_byte save;
png_uint_32 i;
for (i = 0, rp = row; i < row_info->width; i++, rp += 3)
for (i = 0, rp = row; i < row_width; i++, rp += 3)
{
save = *rp;
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
@@ -525,12 +523,11 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_byte save;
png_uint_32 i;
for (i = 0, rp = row; i < row_info->width; i++, rp += 4)
for (i = 0, rp = row; i < row_width; i++, rp += 4)
{
save = *rp;
png_byte save = *rp;
*rp = *(rp + 2);
*(rp + 2) = save;
}
@@ -541,33 +538,31 @@ png_do_bgr(png_row_infop row_info, png_bytep row)
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
png_bytep rp;
png_byte save[2];
png_uint_32 i;
for (i = 0, rp = row; i < row_info->width; i++, rp += 6)
for (i = 0, rp = row; i < row_width; i++, rp += 6)
{
save[0] = *rp;
save[1] = *(rp + 1);
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 4) = save[0];
*(rp + 5) = save[1];
*(rp + 5) = save;
}
}
else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
{
png_bytep rp;
png_byte save[2];
png_uint_32 i;
for (i = 0, rp = row; i < row_info->width; i++, rp += 8)
for (i = 0, rp = row; i < row_width; i++, rp += 8)
{
save[0] = *rp;
save[1] = *(rp + 1);
png_byte save = *rp;
*rp = *(rp + 4);
*(rp + 4) = save;
save = *(rp + 1);
*(rp + 1) = *(rp + 5);
*(rp + 4) = save[0];
*(rp + 5) = save[1];
*(rp + 5) = save;
}
}
}

32
src/png/pngwio.c
View File

@@ -1,29 +1,28 @@
/* pngwio.c - functions for data output
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*
* This file provides a location for all output. Users which need
* special handling are expected to write functions which have the same
* arguments as these, and perform similar functions, but possibly use
* different output methods. Note that you shouldn't change these
* This file provides a location for all output. Users who need
* special handling are expected to write functions that have the same
* arguments as these and perform similar functions, but that possibly
* use different output methods. Note that you shouldn't change these
* functions, but rather write replacement functions and then change
* them at run time with png_set_write_fn(...).
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Write the data to whatever output you are using. The default routine
writes to a file pointer. Note that this routine sometimes gets called
with very small lengths, so you should implement some kind of simple
buffering if you are using unbuffered writes. This should never be asked
to write more then 64K on a 16 bit machine. */
to write more than 64K on a 16 bit machine. */
void
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
@@ -35,7 +34,7 @@ png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
}
#if !defined(PNG_NO_STDIO)
/* This is the function which does the actual writing of data. If you are
/* This is the function that does the actual writing of data. If you are
not writing to a standard C stream, you should create a replacement
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
@@ -133,13 +132,13 @@ png_default_flush(png_structp png_ptr)
png_ptr - pointer to a png output data structure
io_ptr - pointer to user supplied structure containing info about
the output functions. May be NULL.
write_data_fn - pointer to a new output function which takes as its
write_data_fn - pointer to a new output function that takes as its
arguments a pointer to a png_struct, a pointer to
data to be written, and a 32-bit unsigned int which is
data to be written, and a 32-bit unsigned int that is
the number of bytes to be written. The new write
function should call png_error(png_ptr, "Error msg")
to exit and output any fatal error messages.
flush_data_fn - pointer to a new flush function which takes as its
flush_data_fn - pointer to a new flush function that takes as its
arguments a pointer to a png_struct. After a call to
the flush function, there should be no data in any buffers
or pending transmission. If the output method doesn't do
@@ -175,7 +174,14 @@ png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* It is an error to read while writing a png file */
if (png_ptr->read_data_fn != NULL)
{
png_ptr->read_data_fn = NULL;
png_warning(png_ptr,
"Attempted to set both read_data_fn and write_data_fn in");
png_warning(png_ptr,
"the same structure. Resetting read_data_fn to NULL.");
}
}
#if defined(USE_FAR_KEYWORD)

126
src/png/pngwrite.c
View File

@@ -1,22 +1,21 @@
/* pngwrite.c - general routines to write a PNG file
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
/* get internal access to png.h */
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Writes all the PNG information. This is the suggested way to use the
* library. If you have a new chunk to add, make a function to write it,
* and put it in the correct location here. If you want the chunk written
* after the image data, put it in png_write_end(). I strongly encurage
* after the image data, put it in png_write_end(). I strongly encourage
* you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
* the chunk, as that will keep the code from breaking if you want to just
* write a plain PNG file. If you have long comments, I suggest writing
@@ -218,43 +217,6 @@ png_write_end(png_structp png_ptr, png_infop info_ptr)
png_write_IEND(png_ptr);
}
#if defined(PNG_TIME_RFC1123_SUPPORTED)
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
png_charp
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{
static PNG_CONST char short_months[12][4] =
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
sizeof(char)));
}
#ifdef USE_FAR_KEYWORD
{
char near_time_buf[29];
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 31, short_months[ptime->month - 1],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
png_memcpy(png_ptr->time_buffer, near_time_buf,
29*sizeof(char));
}
#else
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
ptime->day % 31, short_months[ptime->month - 1],
ptime->year, ptime->hour % 24, ptime->minute % 60,
ptime->second % 61);
#endif
return ((png_charp)png_ptr->time_buffer);
}
#endif /* PNG_TIME_RFC1123_SUPPORTED */
#if defined(PNG_WRITE_tIME_SUPPORTED)
void
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
@@ -281,15 +243,32 @@ png_convert_from_time_t(png_timep ptime, time_t ttime)
/* Initialize png_ptr structure, and allocate any memory needed */
png_structp
png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
warn_fn, NULL, NULL, NULL));
}
/* Alternate initialize png_ptr structure, and allocate any memory needed */
png_structp
png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
png_debug(1, "in png_create_write_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
(png_malloc_ptr)malloc_fn)) == NULL)
#else
if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
#endif /* PNG_USER_MEM_SUPPORTED */
{
return ((png_structp)NULL);
}
@@ -306,6 +285,9 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
@@ -335,7 +317,6 @@ png_create_write_struct(png_const_charp user_png_ver, voidp error_ptr,
return ((png_structp)png_ptr);
}
/* Initialize png_ptr structure, and allocate any memory needed */
void
png_write_init(png_structp png_ptr)
@@ -422,6 +403,36 @@ png_write_row(png_structp png_ptr, png_bytep row)
/* initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
/* check for transforms that have been set but were defined out */
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
if (png_ptr->transformations & PNG_FILLER)
png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
if (png_ptr->transformations & PNG_PACKSWAP)
png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
if (png_ptr->transformations & PNG_PACK)
png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
if (png_ptr->transformations & PNG_BGR)
png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
#endif
#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
#endif
png_write_start_row(png_ptr);
}
@@ -601,10 +612,18 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn = NULL;
#endif
png_debug(1, "in png_destroy_write_struct\n");
if (png_ptr_ptr != NULL)
{
png_ptr = *png_ptr_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
}
if (info_ptr_ptr != NULL)
info_ptr = *info_ptr_ptr;
@@ -627,14 +646,22 @@ png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
png_free(png_ptr, info_ptr->pcal_params);
}
#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)info_ptr, free_fn);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
*info_ptr_ptr = (png_infop)NULL;
}
if (png_ptr != NULL)
{
png_write_destroy(png_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
png_destroy_struct_2((png_voidp)png_ptr, free_fn);
#else
png_destroy_struct((png_voidp)png_ptr);
#endif
*png_ptr_ptr = (png_structp)NULL;
}
}
@@ -648,6 +675,9 @@ png_write_destroy(png_structp png_ptr)
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn;
#endif
png_debug(1, "in png_write_destroy\n");
/* free any memory zlib uses */
@@ -678,12 +708,18 @@ png_write_destroy(png_structp png_ptr)
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
error_ptr = png_ptr->error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
#endif
png_memset(png_ptr, 0, sizeof (png_struct));
png_ptr->error_fn = error_fn;
png_ptr->warning_fn = warning_fn;
png_ptr->error_ptr = error_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
png_ptr->free_fn = free_fn;
#endif
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
}
@@ -794,9 +830,7 @@ png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
int num_weights, png_doublep filter_weights,
png_doublep filter_costs)
{
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
int i;
#endif
png_debug(1, "in png_set_filter_heuristics\n");
if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)

94
src/png/pngwtran.c
View File

@@ -1,18 +1,17 @@
/* pngwtran.c - transforms the data in a row for PNG writers
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Transform the data according to the users wishes. The order of
/* Transform the data according to the user's wishes. The order of
* transformations is significant.
*/
void
@@ -48,15 +47,15 @@ png_do_write_transformations(png_structp png_ptr)
png_do_pack(&(png_ptr->row_info), png_ptr->row_buf + 1,
(png_uint_32)png_ptr->bit_depth);
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
if (png_ptr->transformations & PNG_SHIFT)
png_do_shift(&(png_ptr->row_info), png_ptr->row_buf + 1,
&(png_ptr->shift));
#endif
#if defined(PNG_WRITE_SWAP_SUPPORTED)
if (png_ptr->transformations & PNG_SWAP_BYTES)
png_do_swap(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_ALPHA)
png_do_write_invert_alpha(&(png_ptr->row_info), png_ptr->row_buf + 1);
@@ -97,12 +96,14 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
png_bytep sp, dp;
int mask, v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
mask = 0x80;
v = 0;
for (i = 0; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
if (*sp != 0)
v |= mask;
@@ -126,12 +127,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
png_bytep sp, dp;
int shift, v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
shift = 6;
v = 0;
for (i = 0; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
png_byte value;
@@ -157,12 +159,13 @@ png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
png_bytep sp, dp;
int shift, v;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
sp = row;
dp = row;
shift = 4;
v = 0;
for (i = 0; i < row_info->width; i++)
for (i = 0; i < row_width; i++)
{
png_byte value;
@@ -214,9 +217,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
row_info->color_type != PNG_COLOR_TYPE_PALETTE)
{
int shift_start[4], shift_dec[4];
png_uint_32 channels;
int channels = 0;
channels = 0;
if (row_info->color_type & PNG_COLOR_MASK_COLOR)
{
shift_start[channels] = row_info->bit_depth - bit_depth->red;
@@ -245,9 +247,10 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
/* with low row depths, could only be grayscale, so one channel */
if (row_info->bit_depth < 8)
{
png_bytep bp;
png_bytep bp = row;
png_uint_32 i;
png_byte mask;
png_uint_32 row_bytes = row_info->rowbytes;
if (bit_depth->gray == 1 && row_info->bit_depth == 2)
mask = 0x55;
@@ -256,7 +259,7 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
else
mask = 0xff;
for (bp = row, i = 0; i < row_info->rowbytes; i++, bp++)
for (i = 0; i < row_bytes; i++, bp++)
{
png_uint_16 v;
int j;
@@ -274,17 +277,16 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
}
else if (row_info->bit_depth == 8)
{
png_bytep bp;
png_bytep bp = row;
png_uint_32 i;
png_uint_32 istop = channels * row_info->width;
for (bp = row, i = 0; i < row_info->width; i++)
for (i = 0; i < istop; i++, bp++)
{
png_uint_32 c;
for (c = 0; c < channels; c++, bp++)
{
png_uint_16 v;
int j;
int c = (int)(i%channels);
v = *bp;
*bp = 0;
@@ -297,18 +299,15 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
}
}
}
}
else
{
png_bytep bp;
png_uint_32 i;
png_uint_32 istop = channels * row_info->width;
for (bp = row, i = 0; i < row_info->width * row_info->channels; i++)
{
png_uint_32 c;
for (c = 0; c < channels; c++, bp += 2)
for (bp = row, i = 0; i < istop; i++)
{
int c = (int)(i%channels);
png_uint_16 value, v;
int j;
@@ -321,9 +320,8 @@ png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
else
value |= (png_uint_16)((v >> (-j)) & (png_uint_16)0xffff);
}
*bp = (png_byte)(value >> 8);
*(bp + 1) = (png_byte)(value & 0xff);
}
*bp++ = (png_byte)(value >> 8);
*bp++ = (png_byte)(value & 0xff);
}
}
}
@@ -345,12 +343,11 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
if (row_info->bit_depth == 8)
{
png_bytep sp, dp;
png_byte save;
png_uint_32 i;
for (i = 0, sp = dp = row; i < row_info->width; i++)
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
save = *(sp++);
png_byte save = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@@ -361,11 +358,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
else
{
png_bytep sp, dp;
png_byte save[2];
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save[2];
save[0] = *(sp++);
save[1] = *(sp++);
*(dp++) = *(sp++);
@@ -385,12 +383,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
if (row_info->bit_depth == 8)
{
png_bytep sp, dp;
png_byte save;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
save = *(sp++);
png_byte save = *(sp++);
*(dp++) = *(sp++);
*(dp++) = save;
}
@@ -399,11 +397,12 @@ png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
else
{
png_bytep sp, dp;
png_byte save[2];
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
png_byte save[2];
save[0] = *(sp++);
save[1] = *(sp++);
*(dp++) = *(sp++);
@@ -433,8 +432,8 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_bytep sp, dp;
png_uint_32 i;
for (i = 0, sp = dp = row; i < row_info->width; i++)
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@@ -447,8 +446,9 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);
@@ -468,8 +468,9 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
*(dp++) = 255 - *(sp++);
@@ -480,8 +481,9 @@ png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_bytep sp, dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
for (i = 0, sp = dp = row; i < row_info->width; i++)
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);

295
src/png/pngwutil.c
View File

@@ -1,16 +1,15 @@
/* pngwutil.c - utilities to write a PNG file
*
* libpng 1.0.1
* libpng 1.0.3 - January 14, 1999
* For conditions of distribution and use, see copyright notice in png.h
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
* Copyright (c) 1996, 1997 Andreas Dilger
* Copyright (c) 1998, Glenn Randers-Pehrson
* March 15, 1998
* Copyright (c) 1998, 1999 Glenn Randers-Pehrson
*/
#define PNG_INTERNAL
#include "../png/png.h"
#include "png.h"
/* Place a 32-bit number into a buffer in PNG byte order. We work
* with unsigned numbers for convenience, although one supported
@@ -274,7 +273,7 @@ png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
}
/* write the palette. We are careful not to trust png_color to be in the
* correct order for PNG, so people can redefine it to any convient
* correct order for PNG, so people can redefine it to any convenient
* structure.
*/
void
@@ -575,7 +574,8 @@ png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
}
#endif
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
defined(PNG_WRITE_pCAL_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
* and if invalid, correct the keyword rather than discarding the entire
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
@@ -766,7 +766,7 @@ png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
}
/* We can't write the chunk until we find out how much data we have,
* which means we need to run the compressor first, and save the
* which means we need to run the compressor first and save the
* output. This shouldn't be a problem, as the vast majority of
* comments should be reasonable, but we will set up an array of
* malloc'd pointers to be sure.
@@ -1241,7 +1241,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
if (pass < 6)
#endif
{
/* each pixel depth is handled seperately */
/* each pixel depth is handled separately */
switch (row_info->pixel_depth)
{
case 1:
@@ -1252,11 +1252,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
d = 0;
shift = 7;
for (i = png_pass_start[pass]; i < row_info->width;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 3);
@@ -1285,11 +1286,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
shift = 6;
d = 0;
for (i = png_pass_start[pass]; i < row_info->width;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 2);
@@ -1317,11 +1319,12 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
int d;
int value;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
dp = row;
shift = 4;
d = 0;
for (i = png_pass_start[pass]; i < row_info->width;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 1);
@@ -1346,6 +1349,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
png_bytep sp;
png_bytep dp;
png_uint_32 i;
png_uint_32 row_width = row_info->width;
png_size_t pixel_bytes;
/* start at the beginning */
@@ -1354,7 +1358,7 @@ png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
pixel_bytes = (row_info->pixel_depth >> 3);
/* loop through the row, only looking at the pixels that
matter */
for (i = png_pass_start[pass]; i < row_info->width;
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
/* find out where the original pixel is */
@@ -1392,6 +1396,11 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
{
png_bytep prev_row, best_row, row_buf;
png_uint_32 mins, bpp;
png_byte filter_to_do = png_ptr->do_filter;
png_uint_32 row_bytes = row_info->rowbytes;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
int num_p_filters = (int)png_ptr->num_prev_filters;
#endif
png_debug(1, "in png_write_find_filter\n");
/* find out how many bytes offset each pixel is */
@@ -1403,28 +1412,38 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
/* The prediction method we use is to find which method provides the
* smallest value when summing the absolute values of the distances
* from zero using anything >= 128 as negative numbers. This is known
* from zero, using anything >= 128 as negative numbers. This is known
* as the "minimum sum of absolute differences" heuristic. Other
* heuristics are the "weighted minumum sum of absolute differences"
* heuristics are the "weighted minimum sum of absolute differences"
* (experimental and can in theory improve compression), and the "zlib
* predictive" method (not implemented in libpng 0.95), which does test
* compressions of lines using different filter methods, and then chooses
* the (series of) filter(s) which give minimum compressed data size (VERY
* predictive" method (not implemented yet), which does test compressions
* of lines using different filter methods, and then chooses the
* (series of) filter(s) that give minimum compressed data size (VERY
* computationally expensive).
*
* GRR 980525: consider also
* (1) minimum sum of absolute differences from running average (i.e.,
* keep running sum of non-absolute differences & count of bytes)
* [track dispersion, too? restart average if dispersion too large?]
* (1b) minimum sum of absolute differences from sliding average, probably
* with window size <= deflate window (usually 32K)
* (2) minimum sum of squared differences from zero or running average
* (i.e., ~ root-mean-square approach)
*/
/* We don't need to test the 'no filter' case if this is the only filter
* that has been chosen, as it doesn't actually do anything to the data.
*/
if (png_ptr->do_filter & PNG_FILTER_NONE &&
png_ptr->do_filter != PNG_FILTER_NONE)
if (filter_to_do & PNG_FILTER_NONE &&
filter_to_do != PNG_FILTER_NONE)
{
png_bytep rp;
png_uint_32 sum = 0;
png_uint_32 i;
int v;
for (i = 0, rp = row_buf + 1; i < row_info->rowbytes; i++, rp++)
for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)
{
v = *rp;
sum += (v < 128) ? v : 256 - v;
@@ -1434,17 +1453,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
png_uint_32 sumhi, sumlo;
int j;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */
/* Reduce the sum if we match any of the previous rows */
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_NONE)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
{
sumlo = (sumlo * png_ptr->filter_weights[i]) >>
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[i]) >>
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1468,7 +1488,25 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
/* sub filter */
if (png_ptr->do_filter & PNG_FILTER_SUB)
if (filter_to_do == PNG_FILTER_SUB)
/* it's the only filter so no testing is needed */
{
png_bytep rp, lp, dp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;
i++, rp++, dp++)
{
*dp = *rp;
}
for (lp = row_buf + 1; i < row_bytes;
i++, rp++, lp++, dp++)
{
*dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);
}
best_row = png_ptr->sub_row;
}
else if (filter_to_do & PNG_FILTER_SUB)
{
png_bytep rp, dp, lp;
png_uint_32 sum = 0, lmins = mins;
@@ -1476,23 +1514,24 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
/* We temporarily increase the "minumum sum" by the factor we
/* We temporarily increase the "minimum sum" by the factor we
* would reduce the sum of this filter, so that we can do the
* early exit comparison without scaling the sum each time.
*/
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1530,17 +1569,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_SUB)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)
{
sumlo = (sumlo * png_ptr->inv_filter_weights[i]) >>
sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->inv_filter_weights[i]) >>
sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1565,27 +1605,43 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
/* up filter */
if (png_ptr->do_filter & PNG_FILTER_UP)
if (filter_to_do == PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
pp = prev_row + 1; i < row_bytes;
i++, rp++, pp++, dp++)
{
*dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
}
best_row = png_ptr->up_row;
}
else if (filter_to_do & PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
png_uint_32 sum = 0, lmins = mins;
png_uint_32 i;
int v;
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_UP)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1603,10 +1659,9 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,
pp = prev_row + 1; i < row_info->rowbytes;
i++, rp++, pp++, dp++)
pp = prev_row + 1; i < row_bytes; i++)
{
v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
sum += (v < 128) ? v : 256 - v;
@@ -1617,17 +1672,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_UP)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)
{
sumlo = (sumlo * png_ptr->filter_weights[i]) >>
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[i]) >>
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1652,7 +1708,24 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
/* avg filter */
if (png_ptr->do_filter & PNG_FILTER_AVG)
if (filter_to_do == PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
*dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
}
for (lp = row_buf + 1; i < row_bytes; i++)
{
*dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))
& 0xff);
}
best_row = png_ptr->avg_row;
}
else if (filter_to_do & PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
png_uint_32 sum = 0, lmins = mins;
@@ -1662,17 +1735,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < (png_uint_32)png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_AVG)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1690,16 +1764,16 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,
pp = prev_row + 1; i < bpp; i++, rp++, pp++, dp++)
pp = prev_row + 1; i < bpp; i++)
{
v = *dp = (png_byte)(((int)*rp - ((int)*pp / 2)) & 0xff);
v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);
sum += (v < 128) ? v : 256 - v;
}
for (lp = row_buf + 1; i < row_info->rowbytes;
i++, rp++, pp++, lp++, dp++)
for (lp = row_buf + 1; i < row_bytes; i++)
{
v = *dp = (png_byte)(((int)*rp - (((int)*pp + (int)*lp) / 2)) & 0xff);
v = *dp++ =
(png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);
sum += (v < 128) ? v : 256 - v;
@@ -1710,17 +1784,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_NONE)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)
{
sumlo = (sumlo * png_ptr->filter_weights[i]) >>
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[i]) >>
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1745,7 +1820,45 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
/* Paeth filter */
if (png_ptr->do_filter & PNG_FILTER_PAETH)
if (filter_to_do == PNG_FILTER_PAETH)
{
png_bytep rp, dp, pp, cp, lp;
png_uint_32 i;
for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
pp = prev_row + 1; i < bpp; i++)
{
*dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
}
for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
{
int a, b, c, pa, pb, pc, p;
b = *pp++;
c = *cp++;
a = *lp++;
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
*dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
}
best_row = png_ptr->paeth_row;
}
else if (filter_to_do & PNG_FILTER_PAETH)
{
png_bytep rp, dp, pp, cp, lp;
png_uint_32 sum = 0, lmins = mins;
@@ -1755,17 +1868,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 lmhi, lmlo;
lmlo = lmins & PNG_LOMASK;
lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_VALUE_PAETH)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
{
lmlo = (lmlo * png_ptr->inv_filter_weights[i]) >>
lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
lmhi = (lmhi * png_ptr->inv_filter_weights[i]) >>
lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1783,34 +1897,48 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#endif
for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,
pp = prev_row + 1; (unsigned)i < bpp; i++, rp++, pp++, dp++)
pp = prev_row + 1; i < bpp; i++)
{
v = *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);
v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);
sum += (v < 128) ? v : 256 - v;
}
for (lp = row_buf + 1, cp = prev_row + 1; i < row_info->rowbytes;
i++, rp++, pp++, lp++, dp++, cp++)
for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)
{
int a, b, c, pa, pb, pc, p;
b = *pp;
c = *cp;
a = *lp;
b = *pp++;
c = *cp++;
a = *lp++;
#ifndef PNG_SLOW_PAETH
p = b - c;
pc = a - c;
#ifdef PNG_USE_ABS
pa = abs(p);
pb = abs(pc);
pc = abs(p + pc);
#else
pa = p < 0 ? -p : p;
pb = pc < 0 ? -pc : pc;
pc = (p + pc) < 0 ? -(p + pc) : p + pc;
#endif
p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;
#else /* PNG_SLOW_PAETH */
p = a + b - c;
pa = abs(p - a);
pb = abs(p - b);
pc = abs(p - c);
if (pa <= pb && pa <= pc)
p = a;
else if (pb <= pc)
p = b;
else
p = c;
#endif /* PNG_SLOW_PAETH */
v = *dp = (png_byte)(((int)*rp - p) & 0xff);
v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);
sum += (v < 128) ? v : 256 - v;
@@ -1821,17 +1949,18 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 sumhi, sumlo;
sumlo = sum & PNG_LOMASK;
sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;
for (i = 0; i < png_ptr->num_prev_filters; i++)
for (j = 0; j < num_p_filters; j++)
{
if (png_ptr->prev_filters[i] == PNG_FILTER_PAETH)
if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)
{
sumlo = (sumlo * png_ptr->filter_weights[i]) >>
sumlo = (sumlo * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
sumhi = (sumhi * png_ptr->filter_weights[i]) >>
sumhi = (sumhi * png_ptr->filter_weights[j]) >>
PNG_WEIGHT_SHIFT;
}
}
@@ -1855,19 +1984,19 @@ png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
}
/* Do the actual writing of the filtered row data from the chosen filter. */
png_write_filtered_row(png_ptr, best_row);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
/* Save the type of filter we picked this time for future calculations */
if (png_ptr->num_prev_filters > 0)
{
int i;
for (i = 1; i < (int)png_ptr->num_prev_filters; i++)
int j;
for (j = 1; j < num_p_filters; j++)
{
png_ptr->prev_filters[i] = png_ptr->prev_filters[i - 1];
png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];
}
png_ptr->prev_filters[i] = best_row[0];
png_ptr->prev_filters[j] = best_row[0];
}
#endif
}