Thanks for your reply. I have indeed reviewed the programming guide (many times over the years), and I'm aware of how to provide an ROI function. The guide could really do with an update (and some fixes for errors) and better examples with more detailed explanation. So much of this stuff we've had to figure out by trial and error. We've been able to get away most of the time without supplying much in the way of custom ROIs for a long time, just returning the destRect or destRect inset by -1. But we do have some custom ROIs when using more than one sampler where the two samplers may be different sizes. After first reading your suggestion to reduce the ROI to only the portion being mirrored, I could see how it would be possible to say that some mirroring actions would require only some smaller portion of the input image (with limited ROI) and that this could help in some cases, but I figured this would only help in those cases where the entire image was not needed (the full image mirror flips) and also where th
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Graphics & Games
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General
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