displaying gif images using skia

[swagat mishra]

hi,

i am trying to display a gif animation on android using skia.

i passed the image.gif file to SkImageDecoder::DecodeFile and got back the first frame as a bitmap.

Is there some way to get all the frames, so that i can display the animation?

[Mike Reed]

Skia's imagedecoders do not handle animated-gif yet. The codecs in
webkit do, if you want to try to harvest code from there...

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[swagat mishra]

thanks for the response...

does it handle extracting all frames from a gif?? i can proceed with animation , if i have all the frames as bitmaps

[Mike Reed]

Decoding images is not a skia feature per-se. The Skia library has a
set of wrappers around std decoders (e.g. around libjpeg) that make it
easy to package up the results in an SkBitmap. The wrappers we've
written so far do not support selecting different frames within an
animated gif file, but they could be extended by someone, or rewritten
to do so. At this time it is not a priority for the core skia team,
given the existence of just such a wrapper in chrome/webkit.

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[swagat mishra]

hi,

i would like to know where in chrome webkit, a gif wrapper is present , so that i can take a look and extend skia to handle frames.

can you let me know of the specific place i am supposed to look?

 

[Mike Reed]

WebKit/Source/WebCore/platform/image-decoders/

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[om]

You can possibly use SkMovie (SkGIFMovie) class in images
\SkMoview.h...

You can find a java example in android-lab APIDemos -
BitmapDecode.java
Or simply use:
SkMovie::setTime(time);
followed by
SkMovie::bitmap();
to get appropriate animation bitmap..