SkiaUI

Using Skia, Yoga, SurfaceView/TextureView to build a simple Flexbox-UI framework for Android.

steps：

1. Compile skia https://skia.org/docs/user/build/ ，or unzip arm64-v8a.zip and x86-64.zip files in jniLibs.
2. Using Skia GL context.
3. Two threads: ui-thread & render-thread.
4. Only support FlexboxLayout. Measure/Layout/Draw are triggered by Vsync.
5. TouchEvents: dispatchTouchEvent/interceptTouchEvent/onTouchEvent.
6. Animations support scale/rotate/translate，and will be performed before measure.
   support easing functions: https://easings.net/en
7. Dirty-Render: markDirty if next draw is necessary.
8. Supported Widgets:
   View, ImageView, TextView, Icon, ProgressBar, SVGView, ShaderView, Lottie, VideoView, YUVVideoView, ScrollView, MovingArea, RecyclerView, Swiper, Loading, Switch, Radio, Picker, LyricView, InputView, FlexboxLayout, Page...
9. PlatformView:
   render Android-Views such as WebView/EditText by SurfaceTexture/SkImage, just like Flutter.
   render 3D View by Filament(other engines can also supported)/SurfaceTexture/SkImage.
   render Video(ExoPlayer)/Camera by SurfaceTexture/SkImage.
   ...
10. Development:

    C++	``	See ExamplePage.cpp.
    js	Import v8 to evaluate javascript	See test.js in assets. Support debug in chrome.
    Kotlin	Import kotlin Compose-runtime	Support Live-Edit, save code then ui will refresh. See HYComposeExamplePage.kt in java.
    React	Import react/react-reconciler	demo: https://github.com/tanpuer/skia-ui-react
    Vue	Import @vue/runtime-core	demo: https://github.com/tanpuer/skia-ui-vue. Need import CSS-Selector(TODO).

11. Cross Platform
    ios: https://github.com/tanpuer/HYSkiaUI-iOS
12. Performance Problems:
    Skia: Shader Compilation jank, cache kSKSL