Bug 47657

Summary: -webkit-transition leaves smear when moving text that is aligned end, right, or justify
Product: WebKit Reporter: Yuzo Fujishima <yuzo>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: hamaji, mitz, simon.fraser
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: All   
Attachments:
Description Flags
Test
none
Screenshot none

Yuzo Fujishima
Reported 2010-10-14 00:30:00 PDT
Created attachment 70715 [details] Test Suppose we move a<div> to left by setting -webkit-transition:margin-left 1s; margin-left: -100px; Depending on the font and the width of the <div>, smear can be left on screen. Please see the attached test and the screen shot.
Attachments
Test (1.54 KB, text/html)
2010-10-14 00:30 PDT, Yuzo Fujishima 		no flags
Details
Screenshot (69.79 KB, image/png)
2010-10-14 00:31 PDT, Yuzo Fujishima 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Yuzo Fujishima
Comment 1 2010-10-14 00:31:42 PDT
Created attachment 70716 [details] Screenshot
Simon Fraser (smfr)
Comment 2 2010-10-14 08:50:46 PDT
Ha, it's leaving text smoothing pixels behind.
mitz
Comment 3 2010-10-14 08:57:03 PDT
This is an example of bug 6274. Note that using "text-rednering: optimizelegibility;" prevents this due to the changes in r57215. *** This bug has been marked as a duplicate of bug 6274 ***
Simon Fraser (smfr)
Comment 4 2010-10-14 09:42:27 PDT
Does bug 6274 cover the case where pixels outside the typographic bounds are touched purely for text smoothing?
mitz
Comment 5 2010-10-14 09:46:16 PDT
(In reply to comment #4) > Does bug 6274 cover the case where pixels outside the typographic bounds are touched purely for text smoothing? The fact that activating the fix for that bug (by specifying optimizelegibility) corrects the test case suggests that the answer is “yes” or “text smoothing on Mac OS X doesn’t ever extend into pixels that lie completely outside the glyph’s optical bounds”.
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