Hey List,
I have BitmapData A and BitmapData B;
Is there a fast routine that from every pixel in A will subtract the
color of the coresponding pixel in B?
I'm looking for a solution using the built-in BitmapData functions,
since a manual looop on every pixel will be somewhat intensive (even if
I use the getPixels>loop ByteArray>setPixels hack to set the pixels,
instead of a setPixel() loop);
BitmapData.merge() is a nice and fast way to add pixels from one bitmap
to another, specifing te amount to be added via a Multiplier param. It
would be cool if one can set a multiplier of a negative value, which
will result in substracting the amount instead of adding it, but that's
not possible.
Maybe a soluton is to have the display object of BitmapData A stacked
above that of BitmapData B, with some BlendMode setting (SCREEN?) that
will subtract B pixels from A pixels?
Other ideas?
Thanks,
Bojil
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