Android: drawing bitmaps with sub-pixel coordinates

Question

I've just noticed that despite Canvas.drawBitmap() taking float coordinates (some variants, at least), it performs no sub-pixel anti-aliasing when blitting. That is, the bitmap is always drawn at exact integer coordinates (in my code I use no scaling, canvas matrix is identity, done paint.setFilterBitmap(true)).

Can someone confirm this observation? If this is not supported, are there any known plans to include the anti-aliasing blitting feature?

Answer 1

According to Romain Guy in a similar Google group question:

bitmaps (and other primitives) are always drawn pixel-aligned if the current transform is only a translation. Any other transform will perform sub-pixel positioning.

So an easy solution is

Canvas.scale(1.00001f, 1.00001f);