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Bilinear upscale bug fixes.

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This commit is contained in:
Pavel Krajcevski 2013-08-31 18:30:47 -04:00
parent 40b479487c
commit 1d25e31d2a
1 changed files with 11 additions and 11 deletions
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22
PVRTCEncoder/src/Image.cpp
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@ -115,28 +115,28 @@ void Image::BilinearUpscale(uint32 times, EWrapMode wrapMode) {
int32 highYIdx = (j + offset) / scale; int32 highYIdx = (j + offset) / scale;
int32 lowYIdx = highYIdx - 1; int32 lowYIdx = highYIdx - 1;
uint32 lowXWeight = (i + offset) % scale; uint32 highXWeight = (i + offset) % scale;
uint32 highXWeight = scale - lowXWeight; uint32 lowXWeight = scale - highXWeight;
uint32 lowYWeight = (j + offset) % scale; uint32 highYWeight = (j + offset) % scale;
uint32 highYWeight = scale - lowYWeight; uint32 lowYWeight = scale - highYWeight;
const Pixel &topLeft = GetPixel(highXIdx, lowYIdx, wrapMode); const Pixel &topLeft = GetPixel(lowXIdx, lowYIdx, wrapMode);
const Pixel &topRight = GetPixel(lowXIdx, lowYIdx, wrapMode); const Pixel &topRight = GetPixel(highXIdx, lowYIdx, wrapMode);
const Pixel &bottomLeft = GetPixel(highXIdx, highYIdx, wrapMode); const Pixel &bottomLeft = GetPixel(lowXIdx, highYIdx, wrapMode);
const Pixel &bottomRight = GetPixel(lowXIdx, highYIdx, wrapMode); const Pixel &bottomRight = GetPixel(highXIdx, highYIdx, wrapMode);
// bilerp each channel.... // bilerp each channel....
for(uint32 c = 0; c < 4; c++) { for(uint32 c = 0; c < 4; c++) {
const uint16 left = const uint16 left =
(lowYWeight * static_cast<uint16>(topLeft.Component(c)) + (lowYWeight * static_cast<uint16>(topLeft.Component(c)) +
highYWeight * static_cast<uint16>(bottomLeft.Component(c))) highYWeight * static_cast<uint16>(bottomLeft.Component(c)))
>> scale; / scale;
const uint16 right = const uint16 right =
(lowYWeight * static_cast<uint16>(topRight.Component(c)) + (lowYWeight * static_cast<uint16>(topRight.Component(c)) +
highYWeight * static_cast<uint16>(bottomRight.Component(c))) highYWeight * static_cast<uint16>(bottomRight.Component(c)))
>> scale; / scale;
p.Component(c) = (left * lowXWeight + right * highXWeight) >> scale; p.Component(c) = (left * lowXWeight + right * highXWeight) / scale;
} }
} }
} }