Hi,
i just implemented my own resize method.
Code:
osg::Image* getSubImage(osg::Image* sourceImage, int startX, int startY,int
stopX, int stopY) {
int subImageWidth = stopX - startX;
int subImageHeight = stopY - startY;
if(subImageWidth<=0 || subImageHeight<=0)
{
osg::notify(osg::ALWAYS) << "Error the subimage size is not
correct. Aborting.";
return NULL;
}
std::cout << "Size: " << sourceImage->s() << "x" << sourceImage->s()
<< std::endl;
std::cout << "SubImageSize: " << subImageWidth << "x" << subImageHeight
<< std::endl;
std::cout << "Channels: " << sourceImage->r() << std::endl;
const unsigned char *sourceData = sourceImage->data();
struct pixelStruct {
unsigned char r, g, b;
};
osg::Image* subImage = new osg::Image();
// allocate memory for image data
const unsigned char *targetData = new unsigned char[subImageWidth
* subImageHeight * 3];
struct pixelStruct* pPixelSource = (struct pixelStruct *) (sourceData);
struct pixelStruct* pPixelTarget = (struct pixelStruct *) (targetData);
struct pixelStruct* pCurrentPixelSource = NULL;
struct pixelStruct* pCurrentPixelTarget = NULL;
int subX = 0;
int subY = 0;
for (int x = startX; x < stopX; x++) {
for (int y = startY; y < stopY; y++) {
std::cout << "Source Pixel [" << x << "][" << y << "]"
<< std::endl;
std::cout << "Target Pixel [" << subX << "][" << subY
<< "]"
<< std::endl;
pCurrentPixelSource = &pPixelSource[y *
sourceImage->s() + x];
pCurrentPixelTarget = &pPixelTarget[subY *
subImageWidth + subX];
pCurrentPixelTarget->r = pCurrentPixelSource->r;
pCurrentPixelTarget->g = pCurrentPixelSource->g;
pCurrentPixelTarget->b = pCurrentPixelSource->b;
subY++;
}
subY=0;
subX++;
}
subImage->setImage(subImageWidth, subImageHeight, sourceImage->r(),
sourceImage->getInternalTextureFormat(),
sourceImage->getPixelFormat(), 5121, (unsigned char*)
targetData,
osg::Image::NO_DELETE);
return subImage;
}
Greetings
Johannes
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=18361#18361
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