-keep class com.taobao.gcanvas.GCanvasJNI {
    *** bindTexture(...);
    *** init(...);
    *** sendEvent(...);
    *** setContextType(...);
    *** setDevicePixelRatio(...);
    *** texSubImage2D(...);
    *** registerCallback(...);
}

-optimizationpasses 5
-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontpreverify
-verbose
-ignorewarnings
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*


-keepattributes SourceFile,LineNumberTable
-keepattributes *Annotation*
-keepattributes Signature


-keep class com.taobao.gcanvas.** {
    !private <fields>;
    !private <methods>;
}

-keepnames public class *