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[legacy] Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted

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image, always expand to RGBA if transparency is present.
This commit is contained in:
Glenn Randers-Pehrson 2011-06-07 15:36:54 -05:00
parent d13542a3ee
commit 1883ec49dd
3 changed files with 5 additions and 2 deletions
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2
ANNOUNCE
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@ -110,6 +110,8 @@ version 1.2.45beta01 [June 7, 2011]
was introduced in libpng-1.2.20beta01.
Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
before IDAT.
Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
always expand to RGBA if transparency is present.
(subscription required; visit
https://lists.sourceforge.net/lists/listinfo/png-mng-implement

2
CHANGES
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@ -2711,6 +2711,8 @@ version 1.2.45beta01 [June 7, 2011]
was introduced in libpng-1.2.20beta01.
Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
before IDAT.
Ported bugfix in pngrtran.c from 1.5.3: when expanding a paletted image,
always expand to RGBA if transparency is present.
Send comments/corrections/commendations to png-mng-implement at lists.sf.net
(subscription required; visit

3
pngrtran.c
View File

@ -1196,8 +1196,7 @@ png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
{
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
if (png_ptr->num_trans &&
(png_ptr->transformations & PNG_EXPAND_tRNS))
if (png_ptr->num_trans)
info_ptr->color_type = PNG_COLOR_TYPE_RGB_ALPHA;
else
info_ptr->color_type = PNG_COLOR_TYPE_RGB;