[webkit-dev] Regarding enabling Accelerated 2D Canvas for Android Webkit

[Dong Seong Hwang]

Hi,
I ported ACCELERATED_2D_CANVAS to android in the last year at Dorothy team.
ACCELERATED_2D_CANVAS became very different between the last year and
upstream.
The old ACCELERATED_2D_CANVAS used GraphicsContext3D (for WebGL) made
by Kenneth Russell.
However, removed the old ACCELERATED_2D_CANVAS at following patch.

> commit 69ce1762db4fccb369ad5f273a227409d37c5445
>
> Author: jamesr at google.com <jamesr at google.com
>> @268f45cc-cd09-0410-ab3c-d52691b4dbfc>
>
> Date: Wed Jul 13 00:20:04 2011 +0000
>
>
Upstream WebKit accelerates 2d canvas using Skia GPU.
Only chrome port can enable  ACCELERATED_2D_CANVAS.

When I ported ACCELERATED_2D_CANVAS, I used TexMap for
ACCELERATED_COMPOSITION.
However, it is difficult to use skia gpu with TexMap because we can not
control eglContext in skia gpu explicitly.
Last year, it was easy because GraphicsContext3D in WebKit was used.

I think AviD would like to wait chrome android release.

Hope that helps,
Huang

2012/2/17 Adam Barth <abarth at webkit.org>

> On Thu, Feb 16, 2012 at 4:25 AM, Avi D <www.avid at gmail.com> wrote:
> > Hi,
> > I am fairly new to Webkit. I am currently trying to Enable
> > ACCELERATED_2D_CANVAS flag for my build.
> > When the Flag was enabled (changed in Platform.h -> #define
> > ENABLE_ACCELERATED_2D_CANVAS 1), I got some build errors related to
> > GraphicsContext3D.
> > On further digging into the information, I found that there was a Webkit
> > port which was planned for Android but was later cancelled due to Android
> > using the Chromium port. I did not find much information but for a blog
> > Doorthy team which claimed to have succesfully enabled Accelerated 2D
> > Canvas.
> >
> > I have 3 questions:
> > 1. Is android porting required for resolving this error? (i.e, Enabling
> > ACCELERATED_2D_CANVAS)
> > 2. Can i use Chromium port for using the ACCELERATED_2D_CANVAS? If yes,
> then
> > how?
> > 3. Is there any other way to get ACCELERATED_2D_CANVAS working for the
> > current android webkit?
> >
> > I am currently working on Webkit version:84325.
>
> That revision of WebKit is 10 months old.  There has been a
> substantial amount of work done on ACCELERATED_2D_CANVAS in the last
> 10 months.  You'll likely need to update your version of WebKit to the
> latest revision.
>
> With regards to your question specifically, the Chromium Android port
> does indeed hardware accelerate its <canvas>.  We're in the process of
> landing the Chromium Android port in trunk, but that process is not
> complete yet.  You'll likely have better luck getting it all working
> once we finish landing the port.
>
> Hope that helps,
> Adam
>
>
> > P.S: I am sorry if the questions sound too dumb.
> > Regards
> > AviD
> >
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