On Jul 5, 2012, at 1:05 PM, Edward O'Connor <eocon...@apple.com> wrote:
> Hi, > > As things currently stand in the spec, implementations basically need to > keep N+1 bitmaps per canvas, where N is the number of hit regions. I > doubt any implementors would be enthusiastic to implement hit regions > like this. From a WebKit perspective, we'd much prefer keeping a Path > for each hit region, and then simply using isPointInPath for hit > testing. This also implies that the current piggybacking of "Clear > regions that cover the pixels" in clearRect() could go away. Yay! :) I couldn't agree more. The hit testing code from SVG in WebKit could easily be reused by the Canvas implementation. I believe the rationale for bitmap backing was based on an assumption that it would be easier for authors. I've consistently argued against this assumption. -Charles