[whatwg] Enabling LCD Text and antialiasing in canvas
robert at ocallahan.org
Mon Feb 18 20:40:40 PST 2013
On Tue, Feb 19, 2013 at 5:19 PM, Stephen White <senorblanco at chromium.org>wrote:
> Even with text on an opaque background, I think you still have to worry
> about the case of transformed canvases. E.g., text drawn over an opaque
> background into a single still frame canvas, but then subsequently rotated
> via CSS transforms from 0 degrees through non-0. The first frame can use
> subpixel AA, but then subsequent frames can't. So I think you need to keep
> the command stream around (first case) or
> always render two buffers as soon as you draw text. That seems like a
> pretty heavy burden.
> For canvas->WebGL the problem becomes pretty much intractable, since
> there's no way to know what a given shader will do to the pixels. So I
> think you'd always have to give up and do grayscale AA in that case.
Yes, you're quite right.
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