Bug 34963

Summary: iFrames transformed via -webkit-transform:scale are clipped incorrectly while Google Chrome correctly performs the transform
Product: WebKit Reporter: Neven Mrgan <neven.mrgan>
Component: CSSAssignee: Nobody <webkit-unassigned>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: bdakin, dbates, dglazkov, eric, fishd, hyatt, sam, simon.fraser, tom
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: All   
OS: OS X 10.6   
Attachments:
Description Flags
Example
none
Screenshot Safari vs Chrome none

Neven Mrgan
Reported 2010-02-15 15:34:04 PST
Created attachment 48780 [details] Example Applying a CSS transformation to an iFrame clips it incorrectly. A setting of -webkit-transform: scale(.5) will scale the entire iframe 50%, but it will then also further scale the clipping mask of the iframe's content by another 50%. Attaching a reduced case.
Attachments
Example (249 bytes, text/html)
2010-02-15 15:34 PST, Neven Mrgan 		no flags
Details
Screenshot Safari vs Chrome (152.48 KB, image/png)
2010-03-11 08:34 PST, Thomas Steinacher 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Alexey Proskuryakov
Comment 1 2010-02-17 15:10:13 PST
Same as bug 15676, but with an actual test case?
Thomas Steinacher
Comment 2 2010-03-11 08:34:02 PST
Created attachment 50508 [details] Screenshot Safari vs Chrome Chrome renders correctly
Daniel Bates
Comment 3 2010-03-12 19:45:52 PST
Confirmed in Mac WebKit nightly r55891. Mac Chrome 5.0.307.11 beta seems to properly scale the <iframe> in the example. Since Chrome appears to correctly scale the <iframe> and its contents, I believe this bug is a separate issue from the underlying transform issue described in bug #15676. Thank you Neven Mrgan for the test case and Thomas Steinacher for the Safari Vs Chrome screen shot of the test case.
Daniel Bates
Comment 4 2010-03-12 19:57:33 PST
CC'ing Eric Seidel as he may have some insight into why this issue is not observed in Chrome/Chromium.
Eric Seidel (no email)
Comment 5 2010-03-12 20:29:52 PST
Chrome does not use hardware acceleration for transforms yet. That may or may not be related to this issue.
Sam Weinig
Comment 6 2010-03-12 20:54:41 PST
This is almost certainly due to Mac WebKit using NSViews for iframes which do not transform properly.
Simon Fraser (smfr)
Comment 7 2010-03-12 21:06:07 PST
*** This bug has been marked as a duplicate of bug 15676 ***
Note You need to log in before you can comment on or make changes to this bug.