ilikecats/stk-code_catmod
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Add premultiply (tested) and de-premultiply (untested) code in texture loader.

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All disabled and requiring integration with a setting in materials.xml
(rgba-transform, eg).


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@7661 178a84e3-b1eb-0310-8ba1-8eac791a3b58
This commit is contained in:
mbjornstk
2011-02-09 01:38:27 +00:00
parent c55a3e181c
commit 166512282d
1 changed files with 58 additions and 0 deletions
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58
src/graphics/irr_driver.cpp
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@@ -756,7 +756,65 @@ void IrrDriver::removeCameraSceneNode(scene::ICameraSceneNode *camera)
*/
video::ITexture *IrrDriver::getTexture(const std::string &filename)
{
#undef PREMULPNGS
#ifndef PREMULPNGS
video::ITexture* out = m_scene_manager->getVideoDriver()->getTexture(filename.c_str());
#else
video::IImage* img = m_scene_manager->getVideoDriver()->createImageFromFile(filename.c_str());
// PNGs are non premul, but some are used for premul tasks, so convert
// http://home.comcast.net/~tom_forsyth/blog.wiki.html#[[Premultiplied%20alpha]]
if(StringUtils::hasSuffix(filename.c_str(), ".png")) // FIXME check param, not name
{
if ((img->getColorFormat() == irr::video::ECF_A8R8G8B8) && img->lock())
{
core::dimension2d<u32> dim = img->getDimension();
for(uint x = 0; x < dim.Width; x++)
{
for(uint y = 0; y < dim.Height; y++)
{
video::SColor col = img->getPixel(x, y);
uint alpha = col.getAlpha();
uint red = alpha * col.getRed() / 255;
uint blue = alpha * col.getBlue() / 255;
uint green = alpha * col.getGreen() / 255;
col.set(alpha, red, green, blue);
img->setPixel(x, y, col, false);
}
}
img->unlock();
}
}
/*
// Other formats can be premul, but the tasks can be non premul
// So divide to get the separate RGBA (only possible if alpha!=0)
else if() // FIXME, use param "DE-PREMUL requested" to match above
{
if ((img->getColorFormat() == irr::video::ECF_A8R8G8B8) && img->lock())
{
core::dimension2d<u32> dim = img->getDimension();
for(uint x = 0; x < dim.Width; x++)
{
for(uint y = 0; y < dim.Height; y++)
{
video::SColor col = img->getPixel(x, y);
uint alpha = col.getAlpha();
// Avoid divide by zero
if (alpha) {
uint red = 255 * col.getRed() / alpha ;
uint blue = 255 * col.getBlue() / alpha;
uint green = 255 * col.getGreen() / alpha;
col.set(alpha, red, green, blue);
img->setPixel(x, y, col, false);
}
}
}
img->unlock();
}
}
*/
video::ITexture* out = m_scene_manager->getVideoDriver()->addTexture(filename.c_str(),
img, NULL);
#endif
#ifndef NDEBUG
if (out == NULL)