FGFS-4.1/OpenSceneGraph
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optimize conversion with a union

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This commit is contained in:
Julien Valentin
2019-08-17 22:05:38 +02:00
committed by Julien Valentin
parent 694b1c3d32
commit a9546da368
1 changed files with 12 additions and 11 deletions
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23
src/osgPlugins/dds/ReaderWriterDDS.cpp
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@@ -989,12 +989,17 @@ osg::Image* ReadDDSFile(std::istream& _istream, bool flipDDSRead)
}
}
OSG_INFO<<"ReadDDS, dataType = 0x"<<std::hex<<dataType<<std::endl;
OSG_INFO<<"ReadDDS, dataType = 0x"<<std::hex<<dataType<<std::endl;
typedef union {
float f32;
unsigned char c8[4];
} PaletteWord;
PaletteWord palette [256];
unsigned char palette [1024];
if (ddsd.ddpfPixelFormat.dwFlags & DDPF_PALETTEINDEXED8)
{
if (!_istream.read((char*)palette, 1024))
if (!_istream.read((char*)&palette->c8, 1024))
{
OSG_WARN << "ReadDDSFile warning: couldn't read palette" << std::endl;
return NULL;
@@ -1030,20 +1035,16 @@ osg::Image* ReadDDSFile(std::istream& _istream, bool flipDDSRead)
if (ddsd.ddpfPixelFormat.dwFlags & DDPF_PALETTEINDEXED8)
{
// Now we need to substitute the indexed image data with full RGBA image data.
unsigned char* convertedData = new unsigned char [sizeWithMipmaps * 4];
PaletteWord* convertedData = new PaletteWord [sizeWithMipmaps];
PaletteWord* pconvertedData = convertedData;
for (unsigned int i = 0; i < sizeWithMipmaps; i++)
{
convertedData[i * 4 + 0] = palette[imageData[i] * 4 + 0];
convertedData[i * 4 + 1] = palette[imageData[i] * 4 + 1];
convertedData[i * 4 + 2] = palette[imageData[i] * 4 + 2];
convertedData[i * 4 + 3] = palette[imageData[i] * 4 + 3];
}
pconvertedData++->f32 = palette[imageData[i]].f32;
delete [] imageData;
for (unsigned int i = 0; i < mipmap_offsets.size(); i++)
mipmap_offsets[i] *= 4;
internalFormat = GL_RGBA;
pixelFormat = GL_RGBA;
osgImage->setImage(s,t,r, internalFormat, pixelFormat, dataType, convertedData, osg::Image::USE_NEW_DELETE, packing);
osgImage->setImage(s,t,r, internalFormat, pixelFormat, dataType, convertedData->c8, osg::Image::USE_NEW_DELETE, packing);
}
else
{