[Webkit-unassigned] [Bug 90375] Parallel image decoders

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=90375





--- Comment #32 from Hin-Chung Lam <hclam at google.com>  2012-07-18 18:55:49 PST ---
> That depends on how we refactor RenderingLayerBacking. In this case, we retrieve a NativeImagePtr from RetainedModeBitmapImage. So we can't simply delegate the decision to GraphicsContext.
> 
> I will let you know once we decide how we refactor RenderLayerBacking.

ah! That's right I forgot RenderLayerBacking. RenderLayerBacking does present an interesting case. In your code I understand now these two operations does actually trigger parallel decoding:

RetainedModeBitmapImage::currentFrameIsComplete() and
RetainedModeBitmapImage::nativeImageForCurrentFrame()

Without this extra type calling nativeImageForCurrentFrame() would cause a synchronous decoding for RenderLayerBacking.

Just a thought here, actually adding the notion of asynchronous decoding to BitmapImage, e.g.

BitmapImage::prepareCurrentFrameAsynchronouslyIfPossible()
BitmapImage::nativeImageForCurrentFrame(); // returns 0 if async frame requested but not ready
BitmapImage::currentFrameIsComplete(); // just a getter to see if current frame is ready

prepareCurrentFrameAsynchronouslyIfPossible() is similar to your retained mode counter but have it built-in to BitmapImage.

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