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Only check the tRNS (trans) chunk if the image is still palettized

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This commit is contained in:
Jaime Passos 2020-10-10 14:12:22 -03:00
parent 8dcc415202
commit e746a1ecba
1 changed files with 14 additions and 11 deletions
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25
src/r_picformats.c
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@ -909,20 +909,23 @@ static png_bytep *PNG_Read(
// If any of the tRNS colors have an alpha lower than 0xFF, and that // If any of the tRNS colors have an alpha lower than 0xFF, and that
// color is present on the image, the palette flag is disabled. // color is present on the image, the palette flag is disabled.
png_get_tRNS(png_ptr, png_info_ptr, &trans, &trans_num, &trans_values); if (usepal)
if (trans && trans_num == 256)
{ {
int i; png_get_tRNS(png_ptr, png_info_ptr, &trans, &trans_num, &trans_values);
for (i = 0; i < trans_num; i++)
if (trans && trans_num == 256)
{ {
// libpng will transform this image into RGB even if INT32 i;
// the transparent index does not exist in the image, for (i = 0; i < trans_num; i++)
// and there is no way around that.
if (trans[i] < 0xFF)
{ {
usepal = false; // libpng will transform this image into RGB even if
break; // the transparent index does not exist in the image,
// and there is no way around that.
if (trans[i] < 0xFF)
{
usepal = false;
break;
}
} }
} }
} }