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Fix BC6H_SF decoding error.

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Decoding error were caused by additional sign extend call after endpoint
transform, according to khronos documentation, you only suppose to sign
extend endpoints only once, further calls to sign extend mangles
endpoint data.
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REDxEYE 2022-07-18 20:38:23 +03:00 committed by ShadelessFox
parent f58c0ea533
commit b7715d1600
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7
src/libImaging/BcnDecode.c
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@ -755,13 +755,6 @@ decode_bc6_block(rgb32f *col, const UINT8 *src, int sign) {
endpoints[i + 1] = (endpoints[i + 1] + endpoints[1]) & mask; endpoints[i + 1] = (endpoints[i + 1] + endpoints[1]) & mask;
endpoints[i + 2] = (endpoints[i + 2] + endpoints[2]) & mask; endpoints[i + 2] = (endpoints[i + 2] + endpoints[2]) & mask;
} }
if (sign) {
for (i = 3; i < numep; i += 3) {
bc6_sign_extend(&endpoints[i + 0], info->rb);
bc6_sign_extend(&endpoints[i + 1], info->gb);
bc6_sign_extend(&endpoints[i + 2], info->bb);
}
}
} }
for (i = 0; i < numep; i++) { for (i = 0; i < numep; i++) {
ueps[i] = bc6_unquantize(endpoints[i], info->epb, sign); ueps[i] = bc6_unquantize(endpoints[i], info->epb, sign);