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When going from 344(3/4) pixels to 4555, the alpha channel only has a zero appended to it. Hence we must clear that bit for each pixel that was transparent during decoding.

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This commit is contained in:
Pavel Krajcevski 2013-09-10 13:22:53 -04:00
parent f5e0aa4f9f
commit dd625fca71
1 changed files with 24 additions and 0 deletions
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24
PVRTCEncoder/src/Decompressor.cpp
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@ -143,6 +143,30 @@ namespace PVRTCC {
if(bDebugImages)
imgB.DebugOutput("UnscaledImgB");
// Go through and change the alpha value of any pixel that came from
// a transparent block. For some reason, alpha is not treated the same
// as the other channels (to minimize hardware costs?) and the channels
// do not their MSBs replicated.
for(uint32 j = 0; j < blocksH; j++) {
for(uint32 i = 0; i < blocksW; i++) {
const uint32 blockIdx = j * blocksW + i;
Block &b = blocks[blockIdx];
uint8 bitDepths[4];
b.GetColorA().GetBitDepth(bitDepths);
if(bitDepths[0] > 0) {
Pixel &p = imgA(i, j);
p.A() = p.A() & 0xFE;
}
b.GetColorB().GetBitDepth(bitDepths);
if(bitDepths[0] > 0) {
Pixel &p = imgB(i, j);
p.A() = p.A() & 0xFE;
}
}
}
// Bilinearly upscale the images.
imgA.BilinearUpscale(2, wrapMode);
imgB.BilinearUpscale(2, wrapMode);