void ofPixels_<PixelType>::cropTo(ofPixels_<PixelType> &toPix, int x, int y, int _width, int _height) const{
if (bAllocated){
if(&toPix == this){
toPix.crop(x,y,_width,_height);
return;
}
_width = ofClamp(_width,1,getWidth());
_height = ofClamp(_height,1,getHeight());
if ((toPix.width != _width) || (toPix.height != _height) || (toPix.pixelFormat != pixelFormat)){
toPix.allocate(_width, _height, pixelFormat);
}
// this prevents having to do a check for bounds in the for loop;
int minX = MAX(x, 0) * getNumChannels();
int maxX = MIN(x+_width, width) * getNumChannels();
int minY = MAX(y, 0);
int maxY = MIN(y+_height, height);
iterator newPixel = toPix.begin();
for(ConstLine line = getConstLines().begin()+minY; line!=getConstLines().begin()+maxY; ++line ){
for(const_iterator pixel = line.begin()+minX; pixel<line.begin()+maxX; ++pixel){
*newPixel++ = *pixel;
}
}
}
}
void ofPixels_<PixelType>::setChannel(int channel, const ofPixels_<PixelType> channelPixels){
int channels = channelsFromPixelFormat(pixelFormat);
if(channels==0) return;
channel = ofClamp(channel,0,channels-1);
const_iterator channelPixel = channelPixels.begin();
for(auto p: getPixelsIter()){
p[channel] = *channelPixel++;
}
}
void ofPixels_<PixelType>::setChannel(int channel, const ofPixels_<PixelType> channelPixels){
int channels = channelsFromPixelFormat(pixelFormat);
if(channels==0) return;
channel = ofClamp(channel,0,channels-1);
const_iterator channelPixel = channelPixels.begin();
iterator _end = end();
for(iterator i=begin()+channel;i<_end;i+=channels,++channelPixel){
*i = *channelPixel;
}
}
