I performed the same animation by directly modifying GVT and reduced the CPU
by more than 50%. Ofcourse painting is responsible for only 50% of the CPU
usage and the other 50% is being consumed by either
a. DOM changes
b. The batik code listening for dom changes
The only problem i face with directly modifying the GVT is that i cann't do
repaint of GVT. How to handle it?
Naveed
noni_4444 wrote:
>
> I have a routine where i update several DOM elements inside an update
> manager thread. The problem faced
> is that setAttribute and setNodeValue methods take a lot of CPU time.
>
> An earlier post says:
>
> "Disconnect the tree from the document before making the changes. This
> avoids the overhead of keeping the GVT tree in synch with every change"
>
> In my case i am updating the multiple attributes of different Elements
> repeatedly. How can i detach the attributes of an element before making
> the changes.
> If i do it, it would mean that i do something like
>
> for (1 -> n)
> {
> Get current element from array
> Detach attributes of element //which dom api method to
> call????
> Update multiple attributes of this element
> Attach attributes of element //which dom api method to
> call????
> }
>
> I wrote something like following ... but even this doesn't improve the
> performace. With following code append child is taking alot of CPU time.
>
> for (int i = (oArrObjsToAnimate.size() - 1); i > -1; i--)
> {
> Node pnode =
> oAnimObject.oFgElm.getParentNode();
> pnode.removeChild(oAnimObject.oFgElm);
>
> NamedNodeMap nmap =
> oAnimObject.oFgElm.getAttributes();
> fill(nmap, strExpValue, oAnimObject,
> oObject, oAnim);
>
> pnode.appendChild(oAnimObject.oFgElm);
> }
> }
> }
>
> Any pointers, links, references would be helpful.
>
> Thanks
> Naveed
>
>
>
>
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