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# 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
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"