PostProcessor

interface PostProcessor

Helper interface for adding custom processing to an image.

The image being processed may be a Drawable, a Bitmap, or a frame of an AnimatedImageDrawable produced by ImageDecoder. This is called before the requested object is returned.

This custom processing can even be applied to images that will be returned as immutable objects, such as a Bitmap with Config Bitmap.Config#HARDWARE returned by ImageDecoder.

On an AnimatedImageDrawable, the callback will only be called once, but the drawing commands will be applied to each frame, as if the Canvas had been returned by Picture.beginRecording.

Supplied to ImageDecoder via setPostProcessor.

Summary

Public methods

abstract fun onPostProcess(canvas: Canvas): Int

Path path = new Path();
   path.setFillType(Path.FillType.INVERSE_EVEN_ODD);
   int width = canvas.getWidth();
   int height = canvas.getHeight();
   path.addRoundRect(0, 0, width, height, 20, 20, Path.Direction.CW);
   Paint paint = new Paint();
   paint.setAntiAlias(true);
   paint.setColor(Color.TRANSPARENT);
   paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
   canvas.drawPath(path, paint);
   return PixelFormat.TRANSLUCENT;