1451422 - Revisit blob image rounding / snapping

Status: NEW

(Core :: Graphics: WebRender, enhancement, P3)

Description

[Markus Stange [:mstange]]

For fallback items, with or without blob invalidation, we sometimes round rectangles. We need to audit all the places where it's happening and apply some consistency.

Rules to keep in mind:
 - Rounding should always happen in LayerPixel space. This applies to the size of the image, and to the coordinates that we pass to push_image, for example. LayerPixel space is the "scaled device pixel" space.
 - There are items that snap and items that don't. For example, border images snap, but SVG rectangles don't snap, they anti-alias. For items that don't snap, we need to round the rectangle *outwards*.

Comment 1

[Sylvestre Ledru [:Sylvestre]]

Moving to p3 because no activity for at least 24 weeks.