Android drawing view to draw and erase on a bitmap. Read description

I need a custom drawing view with the following functionalities.

I am also attaching an image showing what I want. Please see it.

1. It should be easily pluggable into any app.

2. It should take two bitmaps. One background and another a mask.

3. The background bitmap should remain untouched

4. the mask can be drawn and erased with finger

5. the drawing cursor size should be modifiable, the drawing cursor size should have an easy way to change the touch offset.

6. the view should zoom both background and mask when the user tries to do it.

7. undo and redo should be there

8. the view must have a function like getFinalMaskedImage(), where in the masked portion of the background image must be returned as a bitmap. The mask itself can be discarded

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