backdrop-filter-snap.yaml

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# Verify that an off-screen surface containing a backdrop-filter still snaps

# to the device pixel grid when attached to a fractional transform. A

# backdrop-filter establishes a resolve sub-graph; regression coverage for the

# surface being left unsnapped (and hence resampled/blurry) at a fractional

# device offset. Mirrors fractional-filter.yaml with an added backdrop-filter.

# The backdrop-filter rect is placed in an empty region clear of the text: it

# only needs to exist to force the resolve sub-graph, and its own edges are not

# grid-snapped, so overlapping the (font-width dependent) text tail would make

# the comparison fragile.

root:

  items:

    - type: stacking-context

      bounds: [0, 0, 1920, 1200]

      transform: translate(-45, 7.491675)

      items:

      - type: stacking-context

        filters: [opacity(0.9)]

        backdrop-root: true

        items:

          - text: "This should be pixel aligned!"

            origin: 416.543499 160.008325

            size: 16

          - type: stacking-context

            bounds: [0, 0, 0, 0]

            items:

              - type: backdrop-filter

                bounds: [700, 400, 40, 20]

                filters: invert(1)