how to solve the problem of OOM,caused by supersized Gif .

[guqun]

Thank you very much to maintain the valuable code,I wonder how to solve the problem of OOM,caused by supersized Gif .example,4096 * 4096

[koral--]

There are several solutions:

• enable largeHeap in manifest (available on API 11+)
• divide your app into several processes (using android:process in manifest) however it can cause some side effects
• if you have another GifDrawables, Bitmaps or another objects not needed at the same time with that huge GIF, you can try recycling (or nullifying) them

Unfortunately currently there is no feature like inSampleSize and all pixels of the GIF need to be loaded into memory.

[guqun]

thanks for your detailed reply,I consider SampleSize is a better method to avoid OOM,As well as SampleSize works great when decoding in my app.Is there have a good way to implement samplesize?

[koral--]

Subsampling is basically skipping each n-th column and row of the image (where n is integral number >=2). Eg. if n=2 just 1st, 3rd, 5th etc. row and column is read respectively. It looks simple in single bitmap however can be a little bit tricky with GIFs. Here are some caveats:

• each frame can have size different than each other and the canvas (example: http://www.imagemagick.org/Usage/anim_basics/#gif_anim 4 small images are drawn with different offsets on the bigger canvas) so it must be calculated in each frame which rows and columns of that frame should be skipped while subsampling
• pixels can be interlaced (see: https://github.com/koral--/android-gif-drawable/blob/master/src/main/jni/gif.c#L332) so their indexes in source does not always match with final frame buffer

To implement subsampling you have to modify flow of GifInfo#rasterBits

[koral--]

@guqun you can try GifTextureView. Bitmap is not needed there. Available on API 14+.

[guqun]

thank you very much! Although there are differences with ImageView, the GifTextureView is a effective way to avoid OOM. I will consider how to behave in the form of GifTextureView and ImageView is consistent.

[huyduongtu]

@guqun Did you find any solution for supporting resize Gif image yet? I'm facing this problem, too.

[koral--]

Info for anyone interested in subsampling option: this feature is now available, more info in: https://github.com/koral--/android-gif-drawable/issues/239