如何制作BitmapDrawable的深层副本？

Question

I'm having trouble cloning a BitmapDrawable. I tried the answer in this post but it creates a "shallow" copy, and I need a "deep" copy so I can alter the pixels in the clone without affecting the original.

I also tried this:

    Bitmap bitmap = bdOriginal.getBitmap();
    BitmapDrawable bdClone = new BitmapDrawable(getResources(), bitmap.copy(bitmap.getConfig(), true));

But it seems to create an immutable clone even though I set the mutable parameter in Bitmap.copy() to "true". That is, color filters don't appear to change the clone. Am I doing it wrong? (EDIT: I used the debugger to confirm bitmap.mIsMutable = true)

To summarize, I need a clone of a BitmapDrawable that can be altered with color filters without affecting the original. Any suggestions?

Thanks in advance...

Answer 1

1. Create new Bitmap of the same size.
2. Create canvas for this new Bitmap
3. Draw your first Bitmap into this canvas.

Example:

Bitmap copy = Bitmap.createBitmap(original.getWidth(), original.getHeight(), original.getConfig());
Canvas copiedCanvas = new Canvas(copy);
copiedCanvas.drawBitmap(original, 0f, 0f, null);