// and do some processing
void multiThreadProcessImages(OfxRectI procWindow)
{
OFX::Image *srcRedImg = _srcLeftImg;
OFX::Image *srcCyanImg = _srcRightImg;
if (_swap) {
std::swap(srcRedImg, srcCyanImg);
}
OfxRectI srcRedBounds = srcRedImg->getBounds();
OfxRectI srcCyanBounds = srcCyanImg->getBounds();
for (int y = procWindow.y1; y < procWindow.y2; y++) {
if (_effect.abort()) {
break;
}
PIX *dstPix = (PIX *) _dstImg->getPixelAddress(procWindow.x1, y);
for (int x = procWindow.x1; x < procWindow.x2; x++) {
// clamp x to avoid black borders
int xRed = std::min(std::max(srcRedBounds.x1,x+(_offset+1)/2),srcRedBounds.x2-1);
int xCyan = std::min(std::max(srcCyanBounds.x1,x-_offset/2),srcCyanBounds.x2-1);
const PIX *srcRedPix = (const PIX *)(srcRedImg ? srcRedImg->getPixelAddress(xRed, y) : 0);
const PIX *srcCyanPix = (const PIX *)(srcCyanImg ? srcCyanImg->getPixelAddress(xCyan, y) : 0);
dstPix[3] = 0; // start with transparent
if (srcRedPix) {
PIX srcLuminance = luminance(srcRedPix[0],srcRedPix[1],srcRedPix[2]);
dstPix[0] = srcLuminance*(1.-_amtcolour) + srcRedPix[0]*_amtcolour;
dstPix[3] += 0.5*srcRedPix[3];
} else {
// no src pixel here, be black and transparent
dstPix[0] = 0;
}
if (srcCyanPix) {
PIX srcLuminance = luminance(srcCyanPix[0],srcCyanPix[1],srcCyanPix[2]);
dstPix[1] = srcLuminance*(1.-_amtcolour) + srcCyanPix[1]*_amtcolour;
dstPix[2] = srcLuminance*(1.-_amtcolour) + srcCyanPix[2]*_amtcolour;
dstPix[3] += 0.5*srcCyanPix[3];
} else {
// no src pixel here, be black and transparent
dstPix[1] = 0;
dstPix[2] = 0;
}
// increment the dst pixel
dstPix += 4;
}
}
}
/** @brief called to process everything */
virtual void process(void)
{
// If _dstImg was set, check that the _renderWindow is lying into dstBounds
if (_dstImg) {
const OfxRectI& dstBounds = _dstImg->getBounds();
// is the renderWindow within dstBounds ?
assert(dstBounds.x1 <= _renderWindow.x1 && _renderWindow.x2 <= dstBounds.x2 &&
dstBounds.y1 <= _renderWindow.y1 && _renderWindow.y2 <= dstBounds.y2);
// exit gracefully in case of error
if (!(dstBounds.x1 <= _renderWindow.x1 && _renderWindow.x2 <= dstBounds.x2 &&
dstBounds.y1 <= _renderWindow.y1 && _renderWindow.y2 <= dstBounds.y2) ||
(_renderWindow.x1 >= _renderWindow.x2) ||
(_renderWindow.y1 >= _renderWindow.y2)) {
return;
}
}
// call the pre MP pass
preProcess();
// make sure there are at least 4096 pixels per CPU and at least 1 line par CPU
unsigned int nCPUs = ((std::min)(_renderWindow.x2 - _renderWindow.x1, 4096) *
(_renderWindow.y2 - _renderWindow.y1)) / 4096;
// make sure the number of CPUs is valid (and use at least 1 CPU)
nCPUs = std::max(1u, (std::min)(nCPUs, OFX::MultiThread::getNumCPUs()));
// call the base multi threading code, should put a pre & post thread calls in too
multiThread(nCPUs);
// call the post MP pass
postProcess();
}