Bug 61387

Summary:

[Qt] Pixelated edges with a rounded border and alpha channel

Product:

WebKit

Reporter:

cheezus <webkitbugs>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED WONTFIX

Severity:

Normal

CC:

benjamin, kling

Priority:

Keywords:

Qt, QtTriaged

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

OS X 10.6

Attachments:

Description	Flags
The html file demonstrating the problem.	none
Screenshot corresponding to second box	none
Screenshot corresponding to first box (no border)	none
Screenshot demonstrating problem	none
Screenshot with all three	none
Result on QtWebKit 2.2 + Qt 4.8	none

cheezus

Reported 2011-05-24 13:21:03 PDT

Created attachment 94672 [details] The html file demonstrating the problem. In the QtWebkit 2.2 branch, the attached image+html file demonstrates that the QtTestBrowser creates a pixelated border when using a border with a non-zero radius and a colour with an alpha component. The three boxes (images attached) show the following: * No border: Edges are nicely rounded * Border without alpha component: Edges are nicely rounded * Border with alpha component: Edges show pixelation This does not occur in Firefox, Safari or Chrome so may be a regression.

Attachments
The html file demonstrating the problem. (986 bytes, text/html) 2011-05-24 13:21 PDT, cheezus	no flags	Details
Screenshot corresponding to second box (6.63 KB, image/png) 2011-05-24 13:21 PDT, cheezus	no flags	Details
Screenshot corresponding to first box (no border) (6.92 KB, image/png) 2011-05-24 13:22 PDT, cheezus	no flags	Details
Screenshot demonstrating problem (6.94 KB, image/png) 2011-05-24 13:22 PDT, cheezus	no flags	Details
Screenshot with all three (70.59 KB, image/png) 2011-05-24 13:23 PDT, cheezus	no flags	Details
Result on QtWebKit 2.2 + Qt 4.8 (50.68 KB, image/png) 2011-05-25 05:51 PDT, Benjamin Poulain	no flags	Details
View All Add attachment proposed patch, testcase, etc.

cheezus

Comment 1 2011-05-24 13:21:39 PDT

Created attachment 94673 [details] Screenshot corresponding to second box

cheezus

Comment 2 2011-05-24 13:22:03 PDT

Created attachment 94674 [details] Screenshot corresponding to first box (no border)

cheezus

Comment 3 2011-05-24 13:22:35 PDT

Created attachment 94675 [details] Screenshot demonstrating problem

cheezus

Comment 4 2011-05-24 13:23:23 PDT

Created attachment 94676 [details] Screenshot with all three

Benjamin Poulain

Comment 5 2011-05-25 05:51:21 PDT

Created attachment 94771 [details] Result on QtWebKit 2.2 + Qt 4.8

Benjamin Poulain

Comment 6 2011-05-25 05:53:51 PDT

Sorry, we don't plan to fix that. You are using one of the native paint engine. There is no plan to support those in the future so we are unlikely to put time into this.

Benjamin Poulain

Comment 7 2011-05-25 06:03:40 PDT

I should be clearer. :) This works fine with Qt 4.8 because raster is now the default graphics system, and our raster does not have those problems (and many other related to rendering with small transforms and/or antialiasing :)).

cheezus

Comment 8 2011-05-25 08:36:57 PDT

Yep, that fixes it. Thanks for looking into it.

Note You need to log in before you can comment on or make changes to this bug.