... that green rectangle is not a bug :-)

(this is all meant to be squashed/rebased later, so WIP)

The module here is providing the hal functions required by the library.

WIP

Note that there is slight artifact with animations because we tuncate
the delta and source_offset.

The drawing scaled image needs to be pixel perfect between two frame even
with two different clipping rect, otherwise, a the image might be a
fraction of a (source) pixel shifted from one frame to the other,
for different part of the image, which is a quite visible artifact

Otherwise, we get artifacts when drawing RGBA images

So that we can keep the same rounding as before and the screenshot test
still pass

Since it is always the same