android-apngrs

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Android bindings to image-rs for APNG support.

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# android-apngrs

Bindings to [image-rs](https://github.com/image-rs/image) for APNG support on Android.

# Usage

You can include the decoder with

```kotlin
implementation("me.tatarka.android:apngrs:0.4")
```

Then you can create a source and decode a drawable. The api is mirrored after
[ImageDecoder](https://developer.android.com/reference/android/graphics/ImageDecoder).

```kotlin
val source = ApngDecoder.source(resources, R.drawable.my_animated_png)
val drawable = ApngDecoder.decodeDrawable(source)
drawable.start() // to start the animation.
```

## Coil Integration

For easy [coil](https://coil-kt.github.io/coil/) integration, include

```kotlin
implementation("me.tatarka.android:apngrs-coil:0.4")
```

and then add the decoder

```kotlin
val imageLoader = ImageLoader.Builder(context)
    .components {
        add(ApngDecoderDecoder.Factory())
    }
    .build()
```

## Current Limitations/Possible Future Directions

- All animations are currently rendered as looping infinitely instead of respecting the num_plays
  value.
- Image data is loaded first into a byte array in memory before decoding, could do some sort of
  streaming support here if I could figure out the jni bits for that.
- image-rs actually supports a wide range of image formats but only APNGs are currently supported.
  May be expanded in the future if there's value.
- Source inputs are limited to byte arrays and resources, this could be expanded pretty easily.

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