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My experience is that copyPixels to a bitmap data makes the whole bitmap data being redrawn if its visible. That giving bad performance of small updates on a big bitmap data...somebody knows a solution of this or is this just a unoptimized thing in Flash that you have to live with?
/Tomas
That is incorrect, only the specified rectangle is added to the back buffer, flagged as dirty and rendered on the next pass. If you have evidence otherwise, id be interested to see it.
Ok thanks, copyPixels works correctly, but it was the mix of clipRect and filters that did something strange..