A few of you might remember my DMX ambilight project from some years back, where I was capturing the screen in real-time on Windows using DXGI, averaging the edges, and sending the data out to a DMX transmitter that could then ambilight a whole stage using RGB PAR cans.
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Even using it in the most naive way I could think of (one call per row in every block) it only takes ~3ms, which is about as fast as my implementation that cheats and only samples a small subset of pixels.
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Hacking this implementation to process a rectangle of pixels within an image should be significantly faster. Likely sub-millisecond processing times on a single core. At 60fps that's under 6% of my CPU time budget!
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