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Two fixes for CheckTransparency. First, don't start checking from

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(x+1,y) since you don't know if (x,y) is transparent or not.  Second,
use x*(numColBytes+1) instead of just x to offset into the first
line.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22368 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Robin Dunn
2003-07-29 18:47:38 +00:00
parent c6151f2a94
commit e45cc23511
1 changed files with 3 additions and 4 deletions
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7
src/common/imagpng.cpp
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@@ -220,14 +220,13 @@ CheckTransparency(unsigned char **lines,
png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h, png_uint_32 x, png_uint_32 y, png_uint_32 w, png_uint_32 h,
size_t numColBytes) size_t numColBytes)
{ {
// we start from (x + 1, y)
x++;
// suppose that a mask will suffice and check all the remaining alpha // suppose that a mask will suffice and check all the remaining alpha
// values to see if it does // values to see if it does
for ( ; y < h; y++ ) for ( ; y < h; y++ )
{ {
unsigned const char *ptr = lines[y] + x; // each pixel is numColBytes+1 bytes, offset into the current line by
// the current x position
unsigned const char *ptr = lines[y] + (x * (numColBytes + 1));
for ( png_uint_32 x2 = x; x2 < w; x2++ ) for ( png_uint_32 x2 = x; x2 < w; x2++ )
{ {