[Webkit-unassigned] [Bug 18212] Canvas rendering changes between Safari and Nightlies

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=18212





------- Comment #1 from dimitri008 at mac.com  2008-03-29 19:22 PDT -------
Created an attachment (id=20205)
 --> (http://bugs.webkit.org/attachment.cgi?id=20205&action=view)
Difference between Safari and Nightly Renderings

http://appkainime.bouniol.homeip.net/test/

I've made a test case and I think I've narrowed it down to a problem linked to
the clip() (and possibly rect()) function(s).
The test is made of two canvases, one clipping each vertical line before it is
drawn, and the other doing so afterwards.

In nightly (left) and safari (right), the rendering is the same for clipping
after drawing, and has a large shadow bleed, in the second canvas (the one on
the right in each browser).
For the first canvas (the one on the left in each browser) however, when the
clip occurs before drawing, the unwanted bleed is only present in nightly
(left).

The second row shows the rendered image drawn with only drawImage and a shadow.

The third row shows each vertical line separated by 1 pixel. On safari (right),
the first canvas (clip before drawing) correctly separates every line, but in
every other case in both safari and webkit, the first line seems to be repeated
several times before the rest of the image comes.


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