marble_eater, vf, and divil, I think you may be interested in this:
BitBlt is 1 second faster every 100 repetitions than DrawImage only when the form is double buffed.
DrawImage is 5 seconds faster than BitBlt every 100 repetitions only when the form is not double buffed.
AlphaBlend took 14 seconds compared to 25 for DrawImage with ImageAttributes.
BitBlt is 1 second faster every 100 repetitions than DrawImage only when the form is double buffed.
DrawImage is 5 seconds faster than BitBlt every 100 repetitions only when the form is not double buffed.
AlphaBlend took 14 seconds compared to 25 for DrawImage with ImageAttributes.
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