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So I’ve read that StretchBlt can mirror images horizontally and/or vertically by negating the nWidthSrc/Dest and nHeightSrc/Dest parameters. I’d like this functionality without the performance overhead of a StretchBlt. I tried the same technique with BitBlt but it didn’t work.
Is there any way to mirror an image with something as simple as BitBlt, without the overkill of a StretchBlt? Or will StretchBlt not affect performance if the source and destination sizes are the same?
BitBlt will only perform mathmatic operations (or, xor, etc) on the individual pixels in question, it will not resize the image in any way. That is exactly what StretchBlt is for, and StretchBlt (compared to any other graphics resizing operation) is insanely fast as in most cases it can use the graphics card to accelerate its performance.