/** @brief overridden from OFX::MultiThread::Processor. This function is called once on each SMP thread by the base class */
void multiThreadFunction(unsigned int threadId, unsigned int nThreads)
{
// slice the y range into the number of threads it has
unsigned int dy = _renderWindow.y2 - _renderWindow.y1;
// the following is equivalent to std::ceil(dy/(double)nThreads);
unsigned int h = (dy+nThreads-1)/nThreads;
if (h == 0) {
// there are more threads than lines to process
h = 1;
}
if (threadId * h >= dy) {
// empty render subwindow
return;
}
unsigned int y1 = _renderWindow.y1 + threadId * h;
unsigned int step = (threadId + 1) * h;
unsigned int y2 = _renderWindow.y1 + (step < dy ? step : dy);
OfxRectI win = _renderWindow;
win.y1 = y1; win.y2 = y2;
// and render that thread on each
multiThreadProcessImages(win);
}
/** @brief overridden from OFX::MultiThread::Processor. This function is called once on each SMP thread by the base class */
void multiThreadFunction( const unsigned int threadId, const unsigned int nThreads )
{
// slice the y range into the number of threads it has
const int dy = std::abs( _renderArgs.renderWindow.y2 - _renderArgs.renderWindow.y1 );
const int y1 = _renderArgs.renderWindow.y1 + threadId * dy / nThreads;
const int step = ( threadId + 1 ) * dy / nThreads;
const int y2 = _renderArgs.renderWindow.y1 + ( step < dy ? step : dy );
OfxRectI winRoW = _renderArgs.renderWindow;
winRoW.y1 = y1;
winRoW.y2 = y2;
// and render that thread on each
multiThreadProcessImages( winRoW );
}
