Bug 61470

Summary:

fast/canvas/canvas-composite.html fails with bad antialiasing on source-out

Product:

WebKit

Reporter:

Adam Klein <adamk>

Component:

DOM

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED DUPLICATE

Severity:

Normal

CC:

benwells, jamesr, jchaffraix, mdelaney7, oliver, senorblanco, simon.fraser

Priority:

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Bad source-out image	none
image from CoreGraphics	none

Adam Klein

Reported 2011-05-25 14:17:44 PDT

Created attachment 94856 [details] Bad source-out image Example result image attached. Notice the artifact of an outline on the top left of source-out.

Attachments
Bad source-out image (11.22 KB, image/png) 2011-05-25 14:17 PDT, Adam Klein	no flags	Details
image from CoreGraphics (21.38 KB, image/png) 2011-05-25 14:28 PDT, James Robinson	no flags	Details
View All Add attachment proposed patch, testcase, etc.

James Robinson

Comment 1 2011-05-25 14:28:03 PDT

Created attachment 94860 [details] image from CoreGraphics here's a better example from coregraphics that doesn't have the same antialiasing issues as skia does.

James Robinson

Comment 2 2011-05-25 14:29:35 PDT

I think the basic issue here is that the clipOut is antialiased, so the pixels on the edge have partial alpha, so they get partially filled in by the globalCompositeOperation, and then get partially cleared by the clear call.

Ben Wells

Comment 3 2011-09-30 03:20:35 PDT

*** This bug has been marked as a duplicate of bug 66036 ***

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