fxBegin/fxEnd crop

MrPi · 03-13-2014 10:45 PM

What's the most efficient way to copy only parts of the image returned from D.fxEnd() to another image?

I would like to call crop directly on fxEnd() to only copy specific areas.
But In my tests only copying the full screen image to another image and then cropping that worked.

PHP Code:

D.fxEnd().copy(m_AggregatedImage, -1, -1, -1, -1, IMAGE_2D, -1);
m_AggregatedImage.crop(m_AggregatedImage, 0, 0, 0, 133, 163, 1); 

But always copying the entire screen is not efficient enough for me.

Rubeus · 03-14-2014 01:59 PM

You probably need to lock the image that .fxEnd() returns using .lock().

MrPi · 03-14-2014 04:30 PM

You can't lock the image that fxEnd() returns as it's const. You could only do lockRead(). But nothing without copy works. If the image wasn't const, I probably could do the cropping on itself.

I've experimented some more and this seems to be working:

PHP Code:

C Image& i = D.fxEnd();
   i.lockRead();
   if (m_AggregatedImage.lock())
   {
      for (Int x = 0; x < 133; ++x)
         for (Int y = 0; y < 163; ++y)
            m_AggregatedImage.color(x, y, i.color(x, y));
      m_AggregatedImage.unlock();
   }
   i.unlock(); 

Greg, would you say that's the most efficient way?

fxBegin/fxEnd crop
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