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Fix how we compute compressed size

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This commit is contained in:
Pavel Krajcevski 2014-11-03 15:07:56 -05:00
parent 1f45a49102
commit 4c03336a43
1 changed files with 12 additions and 6 deletions
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18
Core/src/CompressedImage.cpp
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@ -167,15 +167,21 @@ void CompressedImage::ComputePixels() {
}
uint32 CompressedImage::GetCompressedSize(uint32 uncompressedSize, ECompressionFormat format) {
// Make sure that the uncompressed size is a multiple of the pixel size.
assert(uncompressedSize % sizeof(uint32) == 0);
// The compressed size is the block size times the number of blocks
uint32 blockDim[2];
GetBlockDimensions(format, blockDim);
const uint32 uncompBlockSz = blockDim[0] * blockDim[1] * sizeof(uint32);
const uint32 uncompBlockSize = blockDim[0] * blockDim[1] * sizeof(uint32);
// The uncompressed block size should be a factor of the uncompressed size.
assert(uncompressedSize % uncompBlockSize == 0);
const uint32 nBlocks = uncompressedSize / uncompBlockSize;
const uint32 blockSz = GetBlockSize(format);
assert(uncompBlockSz % blockSz == 0);
const uint32 scale = uncompBlockSz / blockSz;
assert(uncompressedSize % blockSz == 0);
return uncompressedSize / scale;
return nBlocks * blockSz;
}