void ofPixels_<PixelType>::mirrorTo(ofPixels_<PixelType> & dst, bool vertically, bool horizontal) const{
if(&dst == this){
dst.mirror(vertically,horizontal);
return;
}
if (!vertically && !horizontal){
dst = *this;
return;
}
int bytesPerPixel = getNumChannels();
dst.allocate(width, height, getPixelFormat());
if(vertically && !horizontal){
auto dstLines = dst.getLines();
auto lineSrc = getConstLines().begin();
auto line = --dstLines.end();
auto stride = line.getStride();
for(; line>=dstLines.begin(); --line, ++lineSrc){
memcpy(line.begin(), lineSrc.begin(), stride);
}
}else if (!vertically && horizontal){
int wToDo = width/2;
int hToDo = height;
for (int i = 0; i < wToDo; i++){
for (int j = 0; j < hToDo; j++){
int pixelb = i;
int pixela = j*width + i;
for (int k = 0; k < bytesPerPixel; k++){
dst[pixela*bytesPerPixel + k] = pixels[pixelb*bytesPerPixel + k];
dst[pixelb*bytesPerPixel + k] = pixels[pixela*bytesPerPixel + k];
}
}
}
} else {
// I couldn't think of a good way to do this in place. I'm sure there is.
mirrorTo(dst,true, false);
dst.mirror(false, true);
}
}
void ofPixels_<PixelType>::mirrorTo(ofPixels_<PixelType> & dst, bool vertically, bool horizontal) const{
if(&dst == this){
dst.mirror(vertically,horizontal);
return;
}
if (!vertically && !horizontal){
dst = *this;
return;
}
int bytesPerPixel = getNumChannels();
if (! (vertically && horizontal)){
int wToDo = horizontal ? width/2 : width;
int hToDo = vertically ? height/2 : height;
for (int i = 0; i < wToDo; i++){
for (int j = 0; j < hToDo; j++){
int pixelb = (vertically ? (height - j - 1) : j) * width + (horizontal ? (width - i - 1) : i);
int pixela = j*width + i;
for (int k = 0; k < bytesPerPixel; k++){
dst[pixela*bytesPerPixel + k] = pixels[pixelb*bytesPerPixel + k];
dst[pixelb*bytesPerPixel + k] = pixels[pixela*bytesPerPixel + k];
}
}
}
} else {
// I couldn't think of a good way to do this in place. I'm sure there is.
mirrorTo(dst,true, false);
dst.mirror(false, true);
}
}
void ofPixels_<PixelType>::rotate90To(ofPixels_<PixelType> & dst, int nClockwiseRotations) const{
int channels = channelsFromPixelFormat(pixelFormat);
if (bAllocated == false || channels==0){
return;
}
if(&dst == this){
dst.rotate90(nClockwiseRotations);
return;
}
// first, figure out which type of rotation we have
int rotation = nClockwiseRotations;
while (rotation < 0){
rotation+=4;
}
rotation %= 4;
// if it's 0, just make a copy. if it's 2, do it by a mirror operation.
if (rotation == 0) {
dst = *this;
return;
// do nothing!
} else if (rotation == 2) {
mirrorTo(dst, true, true);
return;
}
// otherwise, we will need to do some new allocaiton.
dst.allocate(height,width,getImageType());
int strideSrc = width * channels;
int strideDst = dst.width * channels;
if(rotation == 1){
PixelType * srcPixels = pixels;
PixelType * startPixels = dst.getData() + strideDst;
for (int i = 0; i < height; ++i){
startPixels -= channels;
PixelType * dstPixels = startPixels;
for (int j = 0; j < width; ++j){
for (int k = 0; k < channels; ++k){
dstPixels[k] = srcPixels[k];
}
srcPixels += channels;
dstPixels += strideDst;
}
}
} else if(rotation == 3){
PixelType * dstPixels = dst.pixels;
PixelType * startPixels = pixels + strideSrc;
for (int i = 0; i < dst.height; ++i){
startPixels -= channels;
PixelType * srcPixels = startPixels;
for (int j = 0; j < dst.width; ++j){
for (int k = 0; k < channels; ++k){
dstPixels[k] = srcPixels[k];
}
srcPixels += strideSrc;
dstPixels += channels;
}
}
}
}
