Re: Proposal an attribute for Canvas element

Can you describe what optimizations you are doing? Are you removing
functionality/security checking, etc?


On Thu, Nov 14, 2013 at 5:27 PM, Sunyang (Eric) <eric.sun@huawei.com> wrote:

>  bug # is 23773,23774
>
>
>
> Example:
>
>    <canvas id="myCanvas" imagecanvas="true”></canvas>
>     if imagecanvas is true, canvas only render image, otherwise operate
> like normal case.
>
> Reason:
>
>    During development of browser, we find that,if the browser engine can
> know that this canvas is only for drawring image and identify this
> scenario, then the browser engine can give GPU accelaration for this
> only-drawing-image scenario.
>
>    If we draw canvas, when drawimage,and there are other non-image
> drawing,like text or line, the performance is downgraded.
>
>    After we implement this attribute for canvas element in our android
> webkit kernal,we got test data for using this attribute, and not using this
> attribute.Below is the performance comparision.We use 5 games to test our
> implementation, and find the effect is obvious,please find detailed data
> below.
>
>
> Benefit:
>
>    1) for developer, this attribute is easy to use,we can draw different
> type draw in different canvas,we can get high performance web page.
>    2) for browser engine, it can fully optimize the performance of drawing
> an image,make best use of powser of GPU accelerator.
>
>
> Test Data:
>
> 1、 FishIE Scenario（
> http://ie.microsoft.com/testdrive/Performance/FishIETank/Default.html）
> number of fish         1 10 20 50 100
> before（fps）           46 26 15 12 8
> after（fps）            60 58 58 58 50
> effect(%）     30.43 123.07 286.66 383.33 525.00
> 2、 GUIMark3（
> http://www.craftymind.com/factory/guimark3/bitmap/GM3_JS_Bitmap.html）
>
> before fps） 32
> after （fps） 60
> effect（%） 87.50
> 3、 FishBowl Scenario（
> http://ie.microsoft.com/testdrive/Performance/FishBowl/）
> number of fish          5 10 50
> before(fps）         5 4 2
> after( fps）         60 60 53
> effect（%）     1100.00 1400.00 2500.00
> 4 CanvasGameTest
>         fps
> before         42
> after         121
> effect（%） 188.50
>
> 5 fishjoy
>
>   fps
> before   30fps
> after   50fps
> effect（%）66.67
>