drewcassidy/nvidia-texture-tools
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Use alpha-aware resize when alpha is used for transparency and it's not premultiplied.

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This commit is contained in:
castano 2009-01-28 10:58:57 +00:00
parent 4f576d5539
commit 242aa4254e
1 changed files with 46 additions and 14 deletions
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60
src/nvtt/Compressor.cpp
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@ -701,23 +701,47 @@ void Compressor::Private::downsampleMipmap(Mipmap & mipmap, const InputOptions::
mipmap.toFloatImage(inputOptions);
const FloatImage * floatImage = mipmap.asFloatImage();
FloatImage::WrapMode wrapMode = (FloatImage::WrapMode)inputOptions.wrapMode;
if (inputOptions.mipmapFilter == MipmapFilter_Box)
if (inputOptions.alphaMode == AlphaMode_Transparency)
{
// Use fast downsample.
mipmap.setImage(floatImage->fastDownSample());
if (inputOptions.mipmapFilter == MipmapFilter_Box)
{
BoxFilter filter;
mipmap.setImage(floatImage->downSample(filter, wrapMode, 3));
}
else if (inputOptions.mipmapFilter == MipmapFilter_Triangle)
{
TriangleFilter filter;
mipmap.setImage(floatImage->downSample(filter, wrapMode, 3));
}
else /*if (inputOptions.mipmapFilter == MipmapFilter_Kaiser)*/
{
nvDebugCheck(inputOptions.mipmapFilter == MipmapFilter_Kaiser);
KaiserFilter filter(inputOptions.kaiserWidth);
filter.setParameters(inputOptions.kaiserAlpha, inputOptions.kaiserStretch);
mipmap.setImage(floatImage->downSample(filter, wrapMode, 3));
}
}
else if (inputOptions.mipmapFilter == MipmapFilter_Triangle)
else
{
TriangleFilter filter;
mipmap.setImage(floatImage->downSample(filter, (FloatImage::WrapMode)inputOptions.wrapMode));
}
else /*if (inputOptions.mipmapFilter == MipmapFilter_Kaiser)*/
{
nvDebugCheck(inputOptions.mipmapFilter == MipmapFilter_Kaiser);
KaiserFilter filter(inputOptions.kaiserWidth);
filter.setParameters(inputOptions.kaiserAlpha, inputOptions.kaiserStretch);
mipmap.setImage(floatImage->downSample(filter, (FloatImage::WrapMode)inputOptions.wrapMode));
if (inputOptions.mipmapFilter == MipmapFilter_Box)
{
// Use fast downsample.
mipmap.setImage(floatImage->fastDownSample());
}
else if (inputOptions.mipmapFilter == MipmapFilter_Triangle)
{
TriangleFilter filter;
mipmap.setImage(floatImage->downSample(filter, wrapMode));
}
else /*if (inputOptions.mipmapFilter == MipmapFilter_Kaiser)*/
{
nvDebugCheck(inputOptions.mipmapFilter == MipmapFilter_Kaiser);
KaiserFilter filter(inputOptions.kaiserWidth);
filter.setParameters(inputOptions.kaiserAlpha, inputOptions.kaiserStretch);
mipmap.setImage(floatImage->downSample(filter, wrapMode));
}
}
// Normalize mipmap.
@ -737,7 +761,15 @@ void Compressor::Private::scaleMipmap(Mipmap & mipmap, const InputOptions::Priva
// Resize image.
BoxFilter boxFilter;
mipmap.setImage(mipmap.asFloatImage()->resize(boxFilter, w, h, (FloatImage::WrapMode)inputOptions.wrapMode));
if (inputOptions.alphaMode == AlphaMode_Transparency)
{
mipmap.setImage(mipmap.asFloatImage()->resize(boxFilter, w, h, (FloatImage::WrapMode)inputOptions.wrapMode, 3));
}
else
{
mipmap.setImage(mipmap.asFloatImage()->resize(boxFilter, w, h, (FloatImage::WrapMode)inputOptions.wrapMode));
}
}