Bug 84301 - [chromium] Add canBeginFrame state to CCSchedulerStateMachine to suppress initialization before our surface is available
Summary: [chromium] Add canBeginFrame state to CCSchedulerStateMachine to suppress ini...
Status: RESOLVED FIXED
Alias: None
Product: WebKit
Classification: Unclassified
Component: New Bugs (show other bugs)
Version: 528+ (Nightly build)
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: James Robinson
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-04-18 16:35 PDT by James Robinson
Modified: 2012-04-18 18:30 PDT (History)
4 users (show)

See Also:

Attachments
Patch (18.06 KB, patch)
2012-04-18 16:38 PDT, James Robinson 		enne: review+
Details | Formatted Diff | Diff
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Description James Robinson 2012-04-18 16:35:22 PDT 
[chromium] Add canBeginFrame state to CCSchedulerStateMachine to suppress initialization before our surface is available
Comment 1 James Robinson 2012-04-18 16:38:02 PDT 
Created attachment 137802 [details]
Patch
Comment 2 James Robinson 2012-04-18 16:38:20 PDT 
This is the first part of the fixes for http://code.google.com/p/chromium/issues/detail?id=123356
Comment 3 Nat Duca 2012-04-18 16:56:33 PDT 
Comment on attachment 137802 [details]
Patch

Neat. LGTM.
Comment 4 Adrienne Walker 2012-04-18 17:00:47 PDT 
Comment on attachment 137802 [details]
Patch

How does canBeginFrame differ from canDraw? Is there ever a point where we want to begin a frame but can't draw?
Comment 5 James Robinson 2012-04-18 17:04:45 PDT 
(In reply to comment #4)
> (From update of attachment 137802 [details])
> How does canBeginFrame differ from canDraw? Is there ever a point where we want to begin a frame but can't draw?

canDraw doesn't block commit, this does.  The reason is that if the surface isn't ready yet, then the first makeContextCurrent() will fail so we can't even start the commit.  There are situations where we don't want to swap an actual frame but we can usefully do other things (do a commit, enqueue texture uploads, etc).
Comment 6 Adrienne Walker 2012-04-18 17:16:48 PDT 
Comment on attachment 137802 [details]
Patch

Ok, thanks for the explanation.  R=me.
Comment 7 James Robinson 2012-04-18 17:41:42 PDT 
Here's the rest with a longer explanation in the WebKit/chromium/ChangeLog: https://bugs.webkit.org/show_bug.cgi?id=84305
Comment 8 James Robinson 2012-04-18 18:30:51 PDT 
Committed r114599: <http://trac.webkit.org/changeset/114599>