Bug 33392

Summary: WebGL content disappears when style changes
Product: WebKit Reporter: Simon Fraser (smfr) <simon.fraser>
Component: WebGLAssignee: Dean Jackson <dino>
Status: RESOLVED CONFIGURATION CHANGED    
Severity: Normal CC: bfulgham, kkinnunen, simon.fraser
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Mac   
OS: OS X 10.5   
Attachments:
Description Flags
Testcase none

Simon Fraser (smfr)
Reported 2010-01-08 11:47:07 PST
Created attachment 46148 [details] Testcase The attached testcase has a WebGL canvas that draws a triangle. When you hover over it, it gains a border. In WebKit, at that point the contents of the canvas are lost. This does not happen in Firefox.
Attachments
Testcase (5.62 KB, text/html)
2010-01-08 11:47 PST, Simon Fraser (smfr) 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Chris Marrin
Comment 1 2010-01-08 13:24:10 PST
This actually works as expected on nightly. There is a bug with resizing, but it's filed (https://bugs.webkit.org/show_bug.cgi?id=30073)
Simon Fraser (smfr)
Comment 2 2010-01-08 13:51:27 PST
Reopening, since this will be an issue once the patch in bug 33361 is landed. The issue is that, for a directly composited WebGL layer, HTMLCanvasElement::paint() may never be called, so the beginPaint()/reshape()/endPaint() calls will never be called on the WebGLRenderingContext. Now, some style change can happen that requires that the canvas's layer gets backing store and paints (say, a border is added). Then this method will call WebGLRenderingContext::reshape(), which causes the canvas to be cleared.
Kimmo Kinnunen
Comment 3 2024-01-17 01:06:56 PST
Works now
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