I quite like this idea. Just my 2c:
Not sure if it's going to work, how about overlap another view on top which has clearColour as background color and/or the "alpha" thing if required, then fill the top layer with that green colour as background, then use the touch action to erase that green background color (replace it with "clear colour") ?
As in this way, the image is left untouched in the lower layer, while the top layer is been updated.
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