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fixed completely broken CheckForTransparency()

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22249 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin
2003-07-23 12:48:11 +00:00
parent cef338d391
commit 36308e0e02
1 changed files with 10 additions and 9 deletions
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19
src/common/imagpng.cpp
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@@ -74,7 +74,7 @@ enum Transparency
// return the kind of transparency needed for this image assuming that it does
// have transparent pixels, i.e. either Transparency_Alpha or Transparency_Mask
static Transparency
CheckTransparency(const unsigned char *ptr,
CheckTransparency(unsigned char **lines,
png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
size_t numColBytes);
@@ -210,13 +210,13 @@ PNGLINKAGEMODE wx_png_warning(png_structp png_ptr, png_const_charp message)
// need a full blown alpha channel in wxImage
//
// parameters:
// ptr the start of the data to examine
// lines raw PNG data
// x, y starting position
// w, h size of the image
// numColBytes number of colour bytes (1 for grey scale, 3 for RGB)
// (NB: alpha always follows the colour bytes)
Transparency
CheckTransparency(const unsigned char *ptr,
CheckTransparency(unsigned char **lines,
png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
size_t numColBytes)
{
@@ -225,15 +225,16 @@ CheckTransparency(const unsigned char *ptr,
// suppose that a mask will suffice and check all the remaining alpha
// values to see if it does
unsigned const char *ptr2 = ptr;
for ( png_uint_32 y2 = y; y2 < h; y2++ )
for ( ; y < h; y++ )
{
unsigned const char *ptr = lines[y] + x;
for ( png_uint_32 x2 = x; x2 < w; x2++ )
{
// skip the grey or colour byte(s)
ptr2 += numColBytes;
ptr += numColBytes;
unsigned char a2 = *ptr2++;
unsigned char a2 = *ptr++;
if ( !IsTransparent(a2) && !IsOpaque(a2) )
{
@@ -365,7 +366,7 @@ void CopyDataFromPNG(wxImage *image,
// only, otherwisewe need the latter
transparency = CheckTransparency
(
ptrSrc,
lines,
x, y,
width, height,
1
@@ -437,7 +438,7 @@ void CopyDataFromPNG(wxImage *image,
{
transparency = CheckTransparency
(
ptrSrc,
lines,
x, y,
width, height,
3