[whatwg] [canvas] request for {create, get, put}ImageDataHD and ctx.backingStorePixelRatio

Glenn Maynard glenn at zewt.org
Tue Apr 17 21:18:34 PDT 2012

On Tue, Apr 17, 2012 at 5:32 PM, Darin Fisher <darin at chromium.org> wrote:

> In Chrome at least, getImageData() doesn't actually block to fetch pixels.
>  The thread is only blocked when the first dereference of the pixel buffer
> occurs.  I believe this is done so that a getImageData() followed by
> putImageData() call will not need to block the calling thread.

This isn't good enough.  It gives no way for developers to ensure that they
don't access the image data until doing so won't cause a synchronous flush.

Glenn Maynard

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