[Interest] About copying the image buffer with alpha blending

[song.7.liu at nokia.com]

Hi,

We found that QPainer::drawImage takes 30~50ms for one 150*114 image, it seems a little slow.

One quick optimization to try is: we want to do the memory copy to the backing store buffer directly instead of using the PaintRasterEngine.
So from Qt, is there a helper function can copy the memory of image with alpha blending ?

Thanks,
Song
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