851 lines
25 KiB
C++
851 lines
25 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: src/common/imagpng.cpp
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// Purpose: wxImage PNG handler
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// Author: Robert Roebling
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// Copyright: (c) Robert Roebling
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#if wxUSE_IMAGE && wxUSE_LIBPNG
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#include "wx/imagpng.h"
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#include "wx/versioninfo.h"
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#ifndef WX_PRECOMP
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#include "wx/log.h"
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#include "wx/intl.h"
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#include "wx/palette.h"
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#include "wx/stream.h"
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#endif
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#include "png.h"
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// For memcpy
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#include <string.h>
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// ----------------------------------------------------------------------------
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// local functions
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// ----------------------------------------------------------------------------
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// init the alpha channel for the image and fill it with 1s up to (x, y)
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static unsigned char *InitAlpha(wxImage *image, png_uint_32 x, png_uint_32 y);
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// is the pixel with this value of alpha a fully opaque one?
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static inline
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bool IsOpaque(unsigned char a)
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{
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return a == 0xff;
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}
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// ============================================================================
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// wxPNGHandler implementation
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// ============================================================================
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wxIMPLEMENT_DYNAMIC_CLASS(wxPNGHandler,wxImageHandler);
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#if wxUSE_STREAMS
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#ifndef PNGLINKAGEMODE
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#ifdef PNGAPI
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#define PNGLINKAGEMODE PNGAPI
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#else
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#define PNGLINKAGEMODE LINKAGEMODE
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#endif
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#endif
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// VS: wxPNGInfoStruct declared below is a hack that needs some explanation.
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// First, let me describe what's the problem: libpng uses jmp_buf in
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// its png_struct structure. Unfortunately, this structure is
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// compiler-specific and may vary in size, so if you use libpng compiled
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// as DLL with another compiler than the main executable, it may not work.
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// Luckily, it is still possible to use setjmp() & longjmp() as long as the
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// structure is not part of png_struct.
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//
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// Sadly, there's no clean way to attach user-defined data to png_struct.
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// There is only one customizable place, png_struct.io_ptr, which is meant
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// only for I/O routines and is set with png_set_read_fn or
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// png_set_write_fn. The hacky part is that we use io_ptr to store
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// a pointer to wxPNGInfoStruct that holds I/O structures _and_ jmp_buf.
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struct wxPNGInfoStruct
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{
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jmp_buf jmpbuf;
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bool verbose;
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union
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{
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wxInputStream *in;
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wxOutputStream *out;
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} stream;
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};
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#define WX_PNG_INFO(png_ptr) ((wxPNGInfoStruct*)png_get_io_ptr(png_ptr))
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// ----------------------------------------------------------------------------
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// helper functions
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// ----------------------------------------------------------------------------
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extern "C"
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{
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static void PNGLINKAGEMODE wx_PNG_stream_reader( png_structp png_ptr, png_bytep data,
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png_size_t length )
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{
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WX_PNG_INFO(png_ptr)->stream.in->Read(data, length);
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}
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static void PNGLINKAGEMODE wx_PNG_stream_writer( png_structp png_ptr, png_bytep data,
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png_size_t length )
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{
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WX_PNG_INFO(png_ptr)->stream.out->Write(data, length);
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}
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static void
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PNGLINKAGEMODE wx_PNG_warning(png_structp png_ptr, png_const_charp message)
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{
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wxPNGInfoStruct *info = png_ptr ? WX_PNG_INFO(png_ptr) : NULL;
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if ( !info || info->verbose )
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{
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wxLogWarning( wxString::FromAscii(message) );
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}
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}
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// from pngerror.c
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// so that the libpng doesn't send anything on stderr
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static void
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PNGLINKAGEMODE wx_PNG_error(png_structp png_ptr, png_const_charp message)
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{
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wx_PNG_warning(NULL, message);
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// we're not using libpng built-in jump buffer (see comment before
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// wxPNGInfoStruct above) so we have to return ourselves, otherwise libpng
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// would just abort
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longjmp(WX_PNG_INFO(png_ptr)->jmpbuf, 1);
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}
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} // extern "C"
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// ----------------------------------------------------------------------------
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// LoadFile() helpers
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// ----------------------------------------------------------------------------
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unsigned char *InitAlpha(wxImage *image, png_uint_32 x, png_uint_32 y)
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{
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// create alpha channel
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image->SetAlpha();
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unsigned char *alpha = image->GetAlpha();
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// set alpha for the pixels we had so far
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png_uint_32 end = y * image->GetWidth() + x;
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for ( png_uint_32 i = 0; i < end; i++ )
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{
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// all the previous pixels were opaque
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*alpha++ = 0xff;
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}
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return alpha;
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}
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// ----------------------------------------------------------------------------
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// reading PNGs
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// ----------------------------------------------------------------------------
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bool wxPNGHandler::DoCanRead( wxInputStream& stream )
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{
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unsigned char hdr[4];
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if ( !stream.Read(hdr, WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
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return false;
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return memcmp(hdr, "\211PNG", WXSIZEOF(hdr)) == 0;
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}
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// convert data from RGB to wxImage format
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static
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void CopyDataFromPNG(wxImage *image,
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unsigned char **lines,
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png_uint_32 width,
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png_uint_32 height,
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int color_type)
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{
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// allocated on demand if we have any non-opaque pixels
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unsigned char *alpha = NULL;
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unsigned char *ptrDst = image->GetData();
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if ( !(color_type & PNG_COLOR_MASK_COLOR) )
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{
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// grey image: GAGAGA... where G == grey component and A == alpha
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for ( png_uint_32 y = 0; y < height; y++ )
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{
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const unsigned char *ptrSrc = lines[y];
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for ( png_uint_32 x = 0; x < width; x++ )
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{
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unsigned char g = *ptrSrc++;
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unsigned char a = *ptrSrc++;
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// the first time we encounter a transparent pixel we must
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// allocate alpha channel for the image
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if ( !IsOpaque(a) && !alpha )
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alpha = InitAlpha(image, x, y);
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if ( alpha )
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*alpha++ = a;
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*ptrDst++ = g;
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*ptrDst++ = g;
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*ptrDst++ = g;
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}
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}
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}
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else // colour image: RGBRGB...
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{
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for ( png_uint_32 y = 0; y < height; y++ )
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{
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const unsigned char *ptrSrc = lines[y];
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for ( png_uint_32 x = 0; x < width; x++ )
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{
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unsigned char r = *ptrSrc++;
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unsigned char g = *ptrSrc++;
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unsigned char b = *ptrSrc++;
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unsigned char a = *ptrSrc++;
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// the logic here is the same as for the grey case
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if ( !IsOpaque(a) && !alpha )
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alpha = InitAlpha(image, x, y);
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if ( alpha )
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*alpha++ = a;
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*ptrDst++ = r;
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*ptrDst++ = g;
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*ptrDst++ = b;
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}
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}
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}
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}
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// temporarily disable the warning C4611 (interaction between '_setjmp' and
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// C++ object destruction is non-portable) - I don't see any dtors here
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#ifdef __VISUALC__
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#pragma warning(disable:4611)
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#endif /* VC++ */
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bool
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wxPNGHandler::LoadFile(wxImage *image,
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wxInputStream& stream,
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bool verbose,
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int WXUNUSED(index))
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{
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// VZ: as this function uses setjmp() the only fool-proof error handling
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// method is to use goto (setjmp is not really C++ dtors friendly...)
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unsigned char **lines = NULL;
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png_infop info_ptr = (png_infop) NULL;
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wxPNGInfoStruct wxinfo;
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png_uint_32 i, width, height = 0;
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int bit_depth, color_type, interlace_type;
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wxinfo.verbose = verbose;
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wxinfo.stream.in = &stream;
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image->Destroy();
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png_structp png_ptr = png_create_read_struct
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(
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PNG_LIBPNG_VER_STRING,
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NULL,
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wx_PNG_error,
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wx_PNG_warning
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);
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if (!png_ptr)
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goto error;
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// NB: please see the comment near wxPNGInfoStruct declaration for
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// explanation why this line is mandatory
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png_set_read_fn( png_ptr, &wxinfo, wx_PNG_stream_reader);
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info_ptr = png_create_info_struct( png_ptr );
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if (!info_ptr)
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goto error;
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if (setjmp(wxinfo.jmpbuf))
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goto error;
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png_read_info( png_ptr, info_ptr );
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png_get_IHDR( png_ptr, info_ptr, &width, &height, &bit_depth, &color_type, &interlace_type, NULL, NULL );
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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png_set_expand( png_ptr );
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// Fix for Bug [ 439207 ] Monochrome PNG images come up black
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if (bit_depth < 8)
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png_set_expand( png_ptr );
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png_set_strip_16( png_ptr );
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png_set_packing( png_ptr );
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if (png_get_valid( png_ptr, info_ptr, PNG_INFO_tRNS))
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png_set_expand( png_ptr );
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png_set_filler( png_ptr, 0xff, PNG_FILLER_AFTER );
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image->Create((int)width, (int)height, (bool) false /* no need to init pixels */);
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if (!image->IsOk())
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goto error;
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// initialize all line pointers to NULL to ensure that they can be safely
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// free()d if an error occurs before all of them could be allocated
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lines = (unsigned char **)calloc(height, sizeof(unsigned char *));
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if ( !lines )
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goto error;
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for (i = 0; i < height; i++)
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{
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if ((lines[i] = (unsigned char *)malloc( (size_t)(width * 4))) == NULL)
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goto error;
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}
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png_read_image( png_ptr, lines );
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png_read_end( png_ptr, info_ptr );
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#if wxUSE_PALETTE
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if (color_type == PNG_COLOR_TYPE_PALETTE)
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{
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png_colorp palette = NULL;
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int numPalette = 0;
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(void) png_get_PLTE(png_ptr, info_ptr, &palette, &numPalette);
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unsigned char* r = new unsigned char[numPalette];
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unsigned char* g = new unsigned char[numPalette];
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unsigned char* b = new unsigned char[numPalette];
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for (int j = 0; j < numPalette; j++)
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{
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r[j] = palette[j].red;
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g[j] = palette[j].green;
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b[j] = palette[j].blue;
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}
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image->SetPalette(wxPalette(numPalette, r, g, b));
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delete[] r;
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delete[] g;
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delete[] b;
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}
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#endif // wxUSE_PALETTE
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// set the image resolution if it's available
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png_uint_32 resX, resY;
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int unitType;
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if (png_get_pHYs(png_ptr, info_ptr, &resX, &resY, &unitType)
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== PNG_INFO_pHYs)
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{
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wxImageResolution res = wxIMAGE_RESOLUTION_CM;
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switch (unitType)
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{
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default:
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wxLogWarning(_("Unknown PNG resolution unit %d"), unitType);
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wxFALLTHROUGH;
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case PNG_RESOLUTION_UNKNOWN:
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image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, resX);
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image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, resY);
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res = wxIMAGE_RESOLUTION_NONE;
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break;
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case PNG_RESOLUTION_METER:
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/*
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Convert meters to centimeters.
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Use a string to not lose precision (converting to cm and then
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to inch would result in integer rounding error).
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If an app wants an int, GetOptionInt will convert and round
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down for them.
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*/
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image->SetOption(wxIMAGE_OPTION_RESOLUTIONX,
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wxString::FromCDouble((double) resX / 100.0, 2));
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image->SetOption(wxIMAGE_OPTION_RESOLUTIONY,
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wxString::FromCDouble((double) resY / 100.0, 2));
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break;
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}
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image->SetOption(wxIMAGE_OPTION_RESOLUTIONUNIT, res);
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}
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png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
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// loaded successfully, now init wxImage with this data
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CopyDataFromPNG(image, lines, width, height, color_type);
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for ( i = 0; i < height; i++ )
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free( lines[i] );
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free( lines );
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return true;
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error:
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if (verbose)
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{
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wxLogError(_("Couldn't load a PNG image - file is corrupted or not enough memory."));
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}
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if ( image->IsOk() )
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{
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image->Destroy();
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}
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if ( lines )
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{
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for ( unsigned int n = 0; n < height; n++ )
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free( lines[n] );
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free( lines );
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}
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if ( png_ptr )
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{
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if ( info_ptr )
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{
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png_destroy_read_struct( &png_ptr, &info_ptr, (png_infopp) NULL );
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free(info_ptr);
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}
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else
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png_destroy_read_struct( &png_ptr, (png_infopp) NULL, (png_infopp) NULL );
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}
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return false;
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}
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// ----------------------------------------------------------------------------
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// SaveFile() palette helpers
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// ----------------------------------------------------------------------------
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typedef wxLongToLongHashMap PaletteMap;
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static unsigned long PaletteMakeKey(const png_color_8& clr)
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{
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return (wxImageHistogram::MakeKey(clr.red, clr.green, clr.blue) << 8) | clr.alpha;
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}
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static long PaletteFind(const PaletteMap& palette, const png_color_8& clr)
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{
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unsigned long value = PaletteMakeKey(clr);
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PaletteMap::const_iterator it = palette.find(value);
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return (it != palette.end()) ? it->second : wxNOT_FOUND;
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}
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static long PaletteAdd(PaletteMap *palette, const png_color_8& clr)
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{
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unsigned long value = PaletteMakeKey(clr);
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PaletteMap::const_iterator it = palette->find(value);
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size_t index;
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if (it == palette->end())
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{
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index = palette->size();
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(*palette)[value] = index;
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}
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else
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{
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index = it->second;
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}
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return index;
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}
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// ----------------------------------------------------------------------------
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// writing PNGs
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// ----------------------------------------------------------------------------
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bool wxPNGHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
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{
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wxPNGInfoStruct wxinfo;
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wxinfo.verbose = verbose;
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wxinfo.stream.out = &stream;
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png_structp png_ptr = png_create_write_struct
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(
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PNG_LIBPNG_VER_STRING,
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NULL,
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wx_PNG_error,
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wx_PNG_warning
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);
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if (!png_ptr)
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{
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if (verbose)
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{
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wxLogError(_("Couldn't save PNG image."));
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}
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return false;
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}
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png_infop info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == NULL)
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{
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png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
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if (verbose)
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{
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wxLogError(_("Couldn't save PNG image."));
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}
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return false;
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}
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if (setjmp(wxinfo.jmpbuf))
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{
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png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
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if (verbose)
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{
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wxLogError(_("Couldn't save PNG image."));
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}
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return false;
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}
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// NB: please see the comment near wxPNGInfoStruct declaration for
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// explanation why this line is mandatory
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png_set_write_fn( png_ptr, &wxinfo, wx_PNG_stream_writer, NULL);
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const int iHeight = image->GetHeight();
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const int iWidth = image->GetWidth();
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const bool bHasPngFormatOption
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= image->HasOption(wxIMAGE_OPTION_PNG_FORMAT);
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int iColorType = bHasPngFormatOption
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? image->GetOptionInt(wxIMAGE_OPTION_PNG_FORMAT)
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: wxPNG_TYPE_COLOUR;
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bool bHasAlpha = image->HasAlpha();
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bool bHasMask = image->HasMask();
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bool bUsePalette = iColorType == wxPNG_TYPE_PALETTE
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#if wxUSE_PALETTE
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|| (!bHasPngFormatOption && image->HasPalette() )
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#endif
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;
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png_color_8 mask = { 0, 0, 0, 0, 0 };
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if (bHasMask)
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{
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mask.red = image->GetMaskRed();
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mask.green = image->GetMaskGreen();
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mask.blue = image->GetMaskBlue();
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}
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PaletteMap palette;
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if (bUsePalette)
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{
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png_color png_rgb [PNG_MAX_PALETTE_LENGTH];
|
|
png_byte png_trans[PNG_MAX_PALETTE_LENGTH];
|
|
|
|
const unsigned char *pColors = image->GetData();
|
|
const unsigned char* pAlpha = image->GetAlpha();
|
|
|
|
if (bHasMask && !pAlpha)
|
|
{
|
|
// Mask must be first
|
|
PaletteAdd(&palette, mask);
|
|
}
|
|
|
|
for (int y = 0; y < iHeight; y++)
|
|
{
|
|
for (int x = 0; x < iWidth; x++)
|
|
{
|
|
png_color_8 rgba;
|
|
|
|
rgba.red = *pColors++;
|
|
rgba.green = *pColors++;
|
|
rgba.blue = *pColors++;
|
|
rgba.gray = 0;
|
|
rgba.alpha = (pAlpha && !bHasMask) ? *pAlpha++ : 0;
|
|
|
|
// save in our palette
|
|
long index = PaletteAdd(&palette, rgba);
|
|
|
|
if (index < PNG_MAX_PALETTE_LENGTH)
|
|
{
|
|
// save in libpng's palette
|
|
png_rgb[index].red = rgba.red;
|
|
png_rgb[index].green = rgba.green;
|
|
png_rgb[index].blue = rgba.blue;
|
|
png_trans[index] = rgba.alpha;
|
|
}
|
|
else
|
|
{
|
|
bUsePalette = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (bUsePalette)
|
|
{
|
|
png_set_PLTE(png_ptr, info_ptr, png_rgb, palette.size());
|
|
|
|
if (bHasMask && !pAlpha)
|
|
{
|
|
wxASSERT(PaletteFind(palette, mask) == 0);
|
|
png_trans[0] = 0;
|
|
png_set_tRNS(png_ptr, info_ptr, png_trans, 1, NULL);
|
|
}
|
|
else if (pAlpha && !bHasMask)
|
|
{
|
|
png_set_tRNS(png_ptr, info_ptr, png_trans, palette.size(), NULL);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
If saving palettised was requested but it was decided we can't use a
|
|
palette then reset the colour type to RGB.
|
|
*/
|
|
if (!bUsePalette && iColorType == wxPNG_TYPE_PALETTE)
|
|
{
|
|
iColorType = wxPNG_TYPE_COLOUR;
|
|
}
|
|
|
|
bool bUseAlpha = !bUsePalette && (bHasAlpha || bHasMask);
|
|
|
|
int iPngColorType;
|
|
|
|
if (bUsePalette)
|
|
{
|
|
iPngColorType = PNG_COLOR_TYPE_PALETTE;
|
|
iColorType = wxPNG_TYPE_PALETTE;
|
|
}
|
|
else if ( iColorType==wxPNG_TYPE_COLOUR )
|
|
{
|
|
iPngColorType = bUseAlpha ? PNG_COLOR_TYPE_RGB_ALPHA
|
|
: PNG_COLOR_TYPE_RGB;
|
|
}
|
|
else
|
|
{
|
|
iPngColorType = bUseAlpha ? PNG_COLOR_TYPE_GRAY_ALPHA
|
|
: PNG_COLOR_TYPE_GRAY;
|
|
}
|
|
|
|
if (image->HasOption(wxIMAGE_OPTION_PNG_FILTER))
|
|
png_set_filter( png_ptr, PNG_FILTER_TYPE_BASE, image->GetOptionInt(wxIMAGE_OPTION_PNG_FILTER) );
|
|
|
|
if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL))
|
|
png_set_compression_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_LEVEL) );
|
|
|
|
if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL))
|
|
png_set_compression_mem_level( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_MEM_LEVEL) );
|
|
|
|
if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY))
|
|
png_set_compression_strategy( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_STRATEGY) );
|
|
|
|
if (image->HasOption(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE))
|
|
png_set_compression_buffer_size( png_ptr, image->GetOptionInt(wxIMAGE_OPTION_PNG_COMPRESSION_BUFFER_SIZE) );
|
|
|
|
int iBitDepth = !bUsePalette && image->HasOption(wxIMAGE_OPTION_PNG_BITDEPTH)
|
|
? image->GetOptionInt(wxIMAGE_OPTION_PNG_BITDEPTH)
|
|
: 8;
|
|
|
|
png_set_IHDR( png_ptr, info_ptr, image->GetWidth(), image->GetHeight(),
|
|
iBitDepth, iPngColorType,
|
|
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE,
|
|
PNG_FILTER_TYPE_BASE);
|
|
|
|
int iElements;
|
|
png_color_8 sig_bit;
|
|
|
|
if ( iPngColorType & PNG_COLOR_MASK_COLOR )
|
|
{
|
|
sig_bit.red =
|
|
sig_bit.green =
|
|
sig_bit.blue = (png_byte)iBitDepth;
|
|
iElements = 3;
|
|
}
|
|
else // grey
|
|
{
|
|
sig_bit.gray = (png_byte)iBitDepth;
|
|
iElements = 1;
|
|
}
|
|
|
|
if ( bUseAlpha )
|
|
{
|
|
sig_bit.alpha = (png_byte)iBitDepth;
|
|
iElements++;
|
|
}
|
|
|
|
if ( iBitDepth == 16 )
|
|
iElements *= 2;
|
|
|
|
// save the image resolution if we have it
|
|
int resX, resY;
|
|
switch ( GetResolutionFromOptions(*image, &resX, &resY) )
|
|
{
|
|
case wxIMAGE_RESOLUTION_INCHES:
|
|
{
|
|
const double INCHES_IN_METER = 10000.0 / 254;
|
|
resX = int(resX * INCHES_IN_METER);
|
|
resY = int(resY * INCHES_IN_METER);
|
|
}
|
|
break;
|
|
|
|
case wxIMAGE_RESOLUTION_CM:
|
|
resX *= 100;
|
|
resY *= 100;
|
|
break;
|
|
|
|
case wxIMAGE_RESOLUTION_NONE:
|
|
break;
|
|
|
|
default:
|
|
wxFAIL_MSG( wxT("unsupported image resolution units") );
|
|
}
|
|
|
|
if ( resX && resY )
|
|
png_set_pHYs( png_ptr, info_ptr, resX, resY, PNG_RESOLUTION_METER );
|
|
|
|
png_set_sBIT( png_ptr, info_ptr, &sig_bit );
|
|
png_write_info( png_ptr, info_ptr );
|
|
png_set_shift( png_ptr, &sig_bit );
|
|
png_set_packing( png_ptr );
|
|
|
|
unsigned char *
|
|
data = (unsigned char *)malloc( image->GetWidth() * iElements );
|
|
if ( !data )
|
|
{
|
|
png_destroy_write_struct( &png_ptr, (png_infopp)NULL );
|
|
return false;
|
|
}
|
|
|
|
const unsigned char *
|
|
pAlpha = (const unsigned char *)(bHasAlpha ? image->GetAlpha() : NULL);
|
|
|
|
const unsigned char *pColors = image->GetData();
|
|
|
|
for (int y = 0; y != iHeight; ++y)
|
|
{
|
|
unsigned char *pData = data;
|
|
for (int x = 0; x != iWidth; x++)
|
|
{
|
|
png_color_8 clr;
|
|
clr.red = *pColors++;
|
|
clr.green = *pColors++;
|
|
clr.blue = *pColors++;
|
|
clr.gray = 0;
|
|
clr.alpha = (bUsePalette && pAlpha) ? *pAlpha++ : 0; // use with wxPNG_TYPE_PALETTE only
|
|
|
|
switch ( iColorType )
|
|
{
|
|
default:
|
|
wxFAIL_MSG( wxT("unknown wxPNG_TYPE_XXX") );
|
|
wxFALLTHROUGH;
|
|
|
|
case wxPNG_TYPE_COLOUR:
|
|
*pData++ = clr.red;
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = 0;
|
|
*pData++ = clr.green;
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = 0;
|
|
*pData++ = clr.blue;
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = 0;
|
|
break;
|
|
|
|
case wxPNG_TYPE_GREY:
|
|
{
|
|
// where do these coefficients come from? maybe we
|
|
// should have image options for them as well?
|
|
unsigned uiColor =
|
|
(unsigned) (76.544*(unsigned)clr.red +
|
|
150.272*(unsigned)clr.green +
|
|
36.864*(unsigned)clr.blue);
|
|
|
|
*pData++ = (unsigned char)((uiColor >> 8) & 0xFF);
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = (unsigned char)(uiColor & 0xFF);
|
|
}
|
|
break;
|
|
|
|
case wxPNG_TYPE_GREY_RED:
|
|
*pData++ = clr.red;
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = 0;
|
|
break;
|
|
|
|
case wxPNG_TYPE_PALETTE:
|
|
*pData++ = (unsigned char) PaletteFind(palette, clr);
|
|
break;
|
|
}
|
|
|
|
if ( bUseAlpha )
|
|
{
|
|
unsigned char uchAlpha = 255;
|
|
if ( bHasAlpha )
|
|
uchAlpha = *pAlpha++;
|
|
|
|
if ( bHasMask )
|
|
{
|
|
if ( (clr.red == mask.red)
|
|
&& (clr.green == mask.green)
|
|
&& (clr.blue == mask.blue) )
|
|
uchAlpha = 0;
|
|
}
|
|
|
|
*pData++ = uchAlpha;
|
|
if ( iBitDepth == 16 )
|
|
*pData++ = 0;
|
|
}
|
|
}
|
|
|
|
png_bytep row_ptr = data;
|
|
png_write_rows( png_ptr, &row_ptr, 1 );
|
|
}
|
|
|
|
free(data);
|
|
png_write_end( png_ptr, info_ptr );
|
|
png_destroy_write_struct( &png_ptr, (png_infopp)&info_ptr );
|
|
|
|
return true;
|
|
}
|
|
|
|
#ifdef __VISUALC__
|
|
#pragma warning(default:4611)
|
|
#endif /* VC++ */
|
|
|
|
#endif // wxUSE_STREAMS
|
|
|
|
/*static*/ wxVersionInfo wxPNGHandler::GetLibraryVersionInfo()
|
|
{
|
|
// The version string seems to always have a leading space and a trailing
|
|
// new line, get rid of them both.
|
|
wxString str = png_get_header_version(NULL) + 1;
|
|
str.Replace("\n", "");
|
|
|
|
return wxVersionInfo("libpng",
|
|
PNG_LIBPNG_VER_MAJOR,
|
|
PNG_LIBPNG_VER_MINOR,
|
|
PNG_LIBPNG_VER_RELEASE,
|
|
str);
|
|
}
|
|
|
|
#endif // wxUSE_LIBPNG
|