SkHeifCodec & HeifDecoder is an empty implementation ?

[sodino chen]

I config 'skia_use_libheif = true' in my args.gn, and compile against a new libskia.so .

Then try to decode a .heif image.

But it failed!.

After debugged codes, I found 'HeifDecoder' is an empty impelmentation, 

SkHeifCodec::MakeFromStream()  always return nullptr. 

As shown in the screenshot below.

 

Why ?

And how to decode a .heif image?

Thank!

[Leon Scroggins]

The real implementation lives in Android. This empty implementation is only there so that if we make changes to SkHeifCodec we don't accidentally break Android.

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 •  Leon Scroggins

 •  scr...@google.com

[sodino chen]

So, is there any the related methods of skia can be called to decode the .heif image and then can get a SkBitmap ?

[Leon Scroggins]

Depends on where you're running Skia. If you're running on Android, you can use SkImageGeneratorNDK. SkImageGeneratorCG might work on iOS, but I'm not sure.

To view this discussion on the web visit https://groups.google.com/d/msgid/skia-discuss/f0485b38-58c3-4e3c-8d92-c33eb681c1bcn%40googlegroups.com.

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 •  Leon Scroggins

 •  scr...@google.com

[sodino chen]

* Create a generator that uses the Android NDK's APIs for decoding images.
*
* Only supported on devices where __ANDROID_API__ >= 30.

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Get it!  

Thanks.