[webkit-dev] Abstracting the canvas
darin at apple.com
Wed Jan 23 07:50:29 PST 2008
On Jan 23, 2008, at 3:25 AM, Alp Toker wrote:
> Oliver has proposed the first move in abstracting WebKit's canvas
> implementation as part of his putImageData patch:
> The strategy involves splitting functions out into
> CanvasRenderingContext2DCG, CanvasRenderingContext2DCairo, and
> possibly moving other parts into the respective GraphicsContext
> platform implementations.
> I know others have also considered abstracting the canvas but no
> other approaches have yet been proposed, so I thought I'd give a
> heads up on the list.
> If you're planning a different way to split canvas, now is a good
> time to propose it -- silence is acceptance.
My proposal is to move everything into the platform/graphics
implementation; there should be no platform specific code in the
canvas class at all. There would be no separate functions per-platform
in the canvas rendering context or canvas object. We'd create classes
like Image and Pixmap that go along with GraphicsContext and abstract
everything needed by canvas.
I was working on this a year or two ago, got about half way done, and
then dropped it. This was back when canvas had only a CG
implementation. Then others decided to port by adding more ifdefs
instead, which I found disappointing.
I'd like to rework Oliver's patch to fit my preferred approach.
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