[Webkit-unassigned] [Bug 23526] clipToImageBuffer() for all platforms

Thu Jun 24 01:57:04 PDT 2010

https://bugs.webkit.org/show_bug.cgi?id=23526

--- Comment #20 from Dirk Schulze <krit at webkit.org>  2010-06-24 01:57:04 PST ---
(In reply to comment #19)
> I might talk rubbish... but I think that CAIRO_OPERATOR_DEST_IN may be the solution in cairo's case (I guess Skia has something equivalent).
> As described on this page http://cairographics.org/operators/ we can use the mask image (the gradient box in example) to select the areas from the text that remain unchanged and remove the other parts. The only problem is that we need this operator to be "bounded", to respect the text mask and not affect the entire surface.
> I asked on the Cairo mailgroup about why this operator is not bounded and the reply was pretty straightforward "Mostly due to an accident of definitions inherited from XRender I think.". Maybe there is a way to push a bounded version of this operator in Cairo.

This should be possible by clipping, but you'll need the boundaries of the text for it.

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