RESOLVED CONFIGURATION CHANGED 43243
Slowness and bad redraws with CSS background-size property 
https://bugs.webkit.org/show_bug.cgi?id=43243
Summary Slowness and bad redraws with CSS background-size property
a.pultier
Reported 2010-07-30 05:47:05 PDT
Created attachment 63053 [details] Chromium Nightly build When background-size property is used, the background image moves, and the rendering is slow. Especially with move or dragdrop operation. I created a sample page, and I put in attachments screenshots of chromium with a recent webkit and midori with a old webkit. This bug has been verified with Chromium stable, Chromium nightly build, Safari stable, Safari nightly build, and Qt Webkit. According to tests, it would appear between version WebKit/531.2 (Midori) and AppleWebKit/532.4 version (Safari).
Attachments
Chromium Nightly build (164.46 KB, image/png)
2010-07-30 05:47 PDT, a.pultier 		no flags
Details
Midori (old version) (33.87 KB, image/png)
2010-07-30 05:47 PDT, a.pultier 		no flags
Details
Simper testcase (2.43 KB, application/octet-stream)
2010-08-02 10:13 PDT, Simon Fraser (smfr) 		no flags
Details
Just one file this time (13.83 KB, text/html)
2010-08-02 10:20 PDT, Simon Fraser (smfr) 		no flags
Details
Show Obsolete (1) View All Add attachment proposed patch, testcase, etc.
a.pultier
Comment 1 2010-07-30 05:47:44 PDT
Created attachment 63054 [details] Midori (old version)
a.pultier
Comment 2 2010-07-30 05:53:26 PDT
(In reply to comment #0) > Created an attachment (id=63053) [details] > Chromium Nightly build > > When background-size property is used, the background image moves, and the rendering is slow. Especially with move or dragdrop operation. > > I created a sample page, and I put in attachments screenshots of chromium with a recent webkit and midori with a old webkit. > > This bug has been verified with Chromium stable, Chromium nightly build, Safari stable, Safari nightly build, and Qt Webkit. > > According to tests, it would appear between version WebKit/531.2 (Midori) and AppleWebKit/532.4 version (Safari). According to tests, it seems that the bug was *introduced* between version WebKit/531.2 (Midori) and AppleWebKit/532.4 version (Safari).
Simon Fraser (smfr)
Comment 3 2010-08-02 08:52:52 PDT
What does the "defaults" mean in the title?
mitz
Comment 4 2010-08-02 08:58:12 PDT
This looks like bug 26747, which <http://trac.webkit.org/changeset/46002> was supposed to fix.
Simon Fraser (smfr)
Comment 5 2010-08-02 10:13:38 PDT
Created attachment 63228 [details] Simper testcase
Simon Fraser (smfr)
Comment 6 2010-08-02 10:20:29 PDT
Created attachment 63230 [details] Just one file this time
mitz
Comment 7 2010-08-02 10:23:38 PDT
Might this be the low-quality scaling heuristic kicking in and never bothering to clean up after itself?
mitz
Comment 8 2010-08-02 11:17:07 PDT
(In reply to comment #7) > Might this be the low-quality scaling heuristic kicking in and never bothering to clean up after itself? This doesn’t appear to be the case.
Simon Fraser (smfr)
Comment 9 2010-08-02 16:26:27 PDT
I think this might be a side-effect of CG's scaling algorithm.
Mike Lawther
Comment 10 2011-10-11 18:00:02 PDT
I just tried the example on Chrome 16.0.905.0 canary on Windows 7, and I can see the same artifacts. So It doesn't seem to be CG specific.
Brent Fulgham
Comment 11 2022-07-11 17:20:30 PDT
Safari, Chrome, and Firefox show the same rendering behavior for this test case. I do not believe any further compatibility issue remains.
Radar WebKit Bug Importer
Comment 12 2022-07-11 17:21:17 PDT
<rdar://problem/96852062>
Antoine Pultier
Comment 13 2022-07-16 13:23:09 PDT
I confirm the bug has been killed at some point during the last 12 years.
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