[Webkit-unassigned] [Bug 65538] CSS: Native hitmaps (pointer-events: opacity)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65538





--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com>  2011-08-02 08:18:32 PST ---
There was discussion of this at the recent Graphics FX F2F in Seattle. One of the main points was that in some cases just looking at alpha won't work very well; e.g. in the case where the image has a hole in it. This is the classic desktop icon hit testing problem. The right way to solve this would be to allow the author to provide a hit-test mask image.

It was also noted that hit testing based on alpha could be very expensive in some cases (e.g. when you have to do read back the pixels from the GPU).

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