[webkit-qt] TextureMapper activation and use without OpenGL (with underlying DirectFB backend)

Wed Nov 2 02:35:10 PDT 2011

Hi,

    I only used QWebView. In that case I saw just flat objects (in the
"circle" example:
http://webkit.org/blog-files/3d-transforms/poster-circle.html)
    When I use a QGraphicsWebView, in that case, I can see 3D objects now.
    So, in this new configuration, I retried my very simple web site
which only contains a text moving from left to right periodically, and
using CSS3 "left" property animation (declaring it as
"-webkit-transition:all 1s ease-in-out;").
    In that precise case, which normally must have texturemapping being
activated (As I understand), I still have the graphics method
"QPaintEngine::drawTextItem()" being called for every frame during
animation, and "not only once" at first draw need.
    (Even not needed, and to answer your question, I checked that
QWebSettings::AcceleratedCompositingEnabled is really set to true)

    Do you agree that this method "QPaintEngine::drawTextItem()" has not
to be called every frame to redraw my "hello" text during animation ?

    Here is the content of my page:

<html>
<head>
<style type="text/css">
#myText
{
        top: 100px;
        left: 100px;
        position: absolute;
        -webkit-transition:all 1s ease-in-out;
}
</style>

<script language="javascript">
var goRight = false;
function onTimer()
{
  goRight = !goRight;
  document.getElementById("myText").style.left = goRight ? '300px' :
'100px';
  setTimeout("onTimer()", 3500);
}

setTimeout("onTimer()", 500);
</script>
</head>
<body>
<span id="myText">Hello</span>
</body>
</html>


Thx
Sebastien

   
Le 28/10/2011 15:11, noam.rosenthal at nokia.com a écrit :
> (Replying to list)
> It probably means that you have accelerated compositing turned off.
> Are you building from trunk, or using a release?
> In any case, in the releases accelerated-compositing only works for QGraphicsWebView and needs QWebSettings::AcceleratedCompositingEnabled to be set to true,
> and in trunk it should work both for QWebView and for QGraphicsWebView.
>
> No'am
>
> On Oct 28, 2011, at 12:39 PM, ext Sébastien Royer wrote:
>
>   
>> Hi No'am
>>
>>   Thanks for you answer.
>>   Yes I use very light weight web sites that use webkit transforms/CSS.
>>   I have tried the know web site you mention, and I can see the
>> "circle" but with "flat" objects. Does it means TextureMapping is really
>> "acting" ?
>>
>>   In fact, in my case, I have a <div> that contains 1 image + 1 text
>> ("Hello").
>>   When I apply a translation (through -webkit-transition) for this div
>> to shift 'smoothly' from one point to an other, I see in QT that the
>> text "Hello" is asked to be drawn for Each frame during the animation
>> (in QPaintEngine::drawTextItem() (text not accelerated yet)).
>>   I believed that TextureMapping would prevent those "non needed"
>> additionnal text drawings since the visual content of the div, which is
>> moved, has definitely not changed... and would have been drawn once in a
>> "texture".
>>
>> Thx
>> Sebastien
>>
>> NB: I am sorry to answer to your email directly since apparently you did
>> not reply to the mailing list. Sorry.
>>
>> Le 27/10/2011 21:16, noam.rosenthal at nokia.com a écrit :
>>     
>>> Hi Sebastien,
>>>
>>> On Oct 27, 2011, at 12:53 PM, ext Sébastien Royer wrote:
>>>
>>>
>>>       
>>>> Hi
>>>>
>>>> But my first tests show me that TextureMapper is not used yet in my case.
>>>> What is missing ? Or what do you suggest me to do for it to be used in
>>>> this context ?
>>>>
>>>>         
>>> As of today in trunk, TextureMapper only gets activated in web content that becomes "composited", meaning code with CSS animations/3D. Does your web content fall under that category?
>>> Have you tried it with one of the standard compositing tests (e.g. http://webkit.org/blog-files/3d-transforms/poster-circle.html)?
>>> Opening that web-page above, do you see the "3D" circle, or just flat objects?
>>>
>>> No'am
>>>       
>>     
>