[Webkit-unassigned] [Bug 108892] Passing alpha to DeferredImageDecoder once decoding completes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=108892





--- Comment #26 from Hin-Chung Lam <hclam at google.com>  2013-02-14 11:03:44 PST ---
(In reply to comment #25)
> (In reply to comment #24)
> > If there's some chance the mutex isn't necessary, I wish we hadn't landed this.
> 
> 
> I am wondering whether there will be a case that:
> if (decoder->frameHasAlphaAtIndex(0)) {
>   read_pixelref();  
> }
> However, on another thread where alpha value just got set, the skbitmap still haven't been fully decoded yet. So we need a memory barrier there and Mutex should do that.

That will not be the case. alpha value is known only after an image is fully decoded.

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