# bug 2055145: a device-space text run's clip is left unsnapped, so a fractional
# clip edge cuts a whole glyph pixel row whose center lies beyond the edge, even
# though the glyph is snapped to the device grid. The clip should round *out* on
# the non-sub-pixel axis so the snapped glyph's own pixel rows are never shaved.
#
# glyph 55 of Ahem at size 20, baseline y=40, is a solid block spanning device
# rows 19..44; its bottom row is [44,45) (center 44.5). The clip bottom is 44.3,
# just below that center. Today (exact/unsnapped clip) row 44 is dropped; with a
# round-out clip (-> 45) it is kept. Compared against the same block clipped at an
# integer 45 (which keeps row 44).
#
# The opaque background rect keeps the picture-cache tile larger than the text's
# own culling rect, so the tile coverage doesn't clip the glyph row before the
# per-prim clip applies (see bug 2055145 comment: surface coverage path).
root:
  items:
    - type: rect
      bounds: [0, 0, 200, 200]
      color: white
    - bounds: [0, 0, 80, 80]
      glyphs: [55]
      offsets: [10, 40]
      clip-rect: [0, 0, 60, 44.3]
      size: 20
      color: [0, 0, 0, 1]
      font: "Ahem.ttf"