Method extractAlpha

shared/java/Bitmap.java:979–981

Sets dst to alpha described by pixels. Returns false if dst cannot be written to or dst pixels cannot be allocated. @param dst holds PixelRef to fill with alpha layer @return true if alpha layer was not constructed in dst PixelRef

(@NotNull Bitmap dst)

     * @return    true if alpha layer was not constructed in dst PixelRef
     */
    public boolean extractAlpha(@NotNull Bitmap dst) {
        return extractAlpha(dst, null) != null;
    }
    
    /**
     * <p>Sets dst to alpha described by pixels. Returns false if dst cannot