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I have a bitmap image that is of irregular shape that I fill with a certain color to simulate a “meter” of sorts. My current method uses a ColorMatrixColorFilter to replace color on the original bimtap, up to a percentage by bitmap height. What I’d really like to do is replace the color by volume.
You could draw a filled bitmap overtop of the unfilled one, but use a clipping path based on the meter’s level. If that can be done with a rectangular clip, it will be quite straightforward with Canvas.clipRect(float,float,float,float). Otherwise, you may have to specify a more general path and use Canvas.clipPath(Path). However, the clipPath is not anti-aliased, so it can look a bit lousy.
Another option is to draw the overlay directly with a custom Path, possibly using SVG path primitives for convenience. See this project: http://code.google.com/p/svg-android/ and specifically this method: http://svg-android.googlecode.com/svn/trunk/svgandroid/docs/com/larvalabs/svgandroid/SVGParser.html#parsePath(java.lang.String).