Bug 131303

Summary:

[GTK] canvas-composite-*-alpha.html tests failing since added

Product:

WebKit

Reporter:

Sergio Villar Senin <svillar>

Component:

Canvas

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

krit

Priority:

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

Bug Depends on:

79659

Bug Blocks:

Attachments:

Description	Flags
Stroke compositing test	none
WebKitGTK stroke compositing test	none

Description Sergio Villar Senin 2014-04-07 09:27:55 PDT

Both
* fast/canvas/canvas-composite-stroke-alpha.html
* fast/canvas/canvas-composite-text-alpha.html

are failing on GTK bots since added.

Comment 1 Dirk Schulze 2014-04-07 22:15:01 PDT

I can not build Cairo graphics port. In the past, beginTransparencyLayer created a new paint mask for GraphicsContextCairo. This was basically doing what CG does: creating a new layer that is composited with an alpha value afterwards. I wonder why this would not work anymore. Could you send screenshots of https://developer.mozilla.org/samples/canvas-tutorial/6_1_canvas_composite.html please?

Comment 2 Dirk Schulze 2014-04-08 00:01:13 PDT

Created attachment 228811 [details]
Stroke compositing test

Sorry, please upload an image for the attached test.

Comment 3 Jae Hyun Park 2014-04-08 00:22:40 PDT

Created attachment 228816 [details]
WebKitGTK stroke compositing test

This is the screenshot of stroke compositing test that ran on MiniBrowser of WebKitGTK+.

Comment 4 Dirk Schulze 2014-04-08 06:31:45 PDT

(In reply to comment #3)
> Created an attachment (id=228816) [details]
> WebKitGTK stroke compositing test
> 
> This is the screenshot of stroke compositing test that ran on MiniBrowser of WebKitGTK+.

It looks like destination-atop and source-out improved by the patch. Source-in and destination-in are incorrect. Since the other cases work, it seems more like a bug in Cairo graphics.

Comment 5 Dirk Schulze 2014-04-14 09:22:56 PDT

fixed by the dependent bug.