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Merge pull request from radarhere/bc5s

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Fixed bug when reading BC5S DDS images
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Andrew Murray 2023-09-20 18:28:46 +10:00 committed by GitHub
commit 8d81fd98a6
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2 changed files with 2 additions and 2 deletions
Tests/images
bc5s.png
src/libImaging
BcnDecode.c

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src/libImaging/BcnDecode.c
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@ -118,8 +118,8 @@ decode_bc3_alpha(char *dst, const UINT8 *src, int stride, int o, int sign) {
if (sign == 1) {
bc5s_alpha b;
memcpy(&b, src, sizeof(bc5s_alpha));
a0 = (b.a0 + 255) / 2;
a1 = (b.a1 + 255) / 2;
a0 = b.a0 + 128;
a1 = b.a1 + 128;
lut1 = b.lut[0] | (b.lut[1] << 8) | (b.lut[2] << 16);
lut2 = b.lut[3] | (b.lut[4] << 8) | (b.lut[5] << 16);
} else {