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carve_inner_corner_pixel (an earlier ring fix) cut the
border strip's own disk using an inner circle at the *same* centre as
the outer cut, radius - border_width - correct when a titlebar sits
underneath (it shares that exact circle, by construction), but wrong
whenever client content sits underneath instead: content's own
rounded-corner mask (rounded_corners_pixman.rs's apply_corner_mask) is
centred radius from *its own* buffer's edges, and that buffer starts
border_width rows/columns inside the border strip's - a same-radius
circle offset (border_width, border_width) diagonally from the
border's own outer one, not a smaller concentric one. Reusing the
titlebar-style ring left a real, if very small, gap along part of the
seam and a thin sliver of double coverage along the rest - reported
live, at extreme zoom against a solid-colour wallpaper (chosen
specifically to make a sub-pixel gap easy to spot against, unlike the
usual desktop image): "very tiny gaps... corner radius does not
match."
round_top_corners/round_bottom_corners's own `inner_radius: Option<u32>`
parameter is now `inner: Option<InnerRing>`, an explicit (center_row,
center_col, radius) rather than an implicit "same centre, smaller
radius" - InnerRing's own doc comment has the full geometry for both
cases. render_border_top gained a `decorated` parameter to pick the
right one (titlebar-aligned when true, content-aligned - centre
shifted by border_width on both axes, radius unchanged - when false);
render_border_bottom always uses the content-aligned ring, since this
compositor never draws a bottom titlebar.
apply_corner_mask (rounded_corners_pixman.rs) made pub(crate) so the
new regression test can build a real masked content buffer via the
actual production function, not a reimplementation of its math.
border_top_and_content_mask_have_no_gap_along_the_corner_diagonal_when_undecorated
checks coverage along the diagonal ray between the two circles'
centres - the direction they're actually offset along, and so the
worst case for a gap opening up between them - against the real
render_border_top/apply_corner_mask output, not a hand-rederived
formula.
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round_top_corners/round_bottom_corners only ever cut pixels *outside*
the shared corner radius (the rounded outer silhouette). Nothing cut
anything *inside* it, so a border strip's own "extra" rows (present
whenever corner_radius > border_width) stayed a solid filled disk out
to the centre column/row, then hit clip_middle_beyond_thickness's
hard, unblended rectangular cut right at the disk's own most opaque
point - a clean right-angle step, not a curve. Confirmed live,
zoomed: a real square notch bitten into an otherwise smooth arc,
reported as "squares on the inside corners of each vertex."
Added carve_inner_corner_pixel, the same smoothstep falloff as the
existing outer cut but inverted (cuts near the centre instead of far
from it), applied at radius - border_width so the corner becomes a
genuine ring of ~border_width visible thickness tapering smoothly to
transparent, instead of a filled wedge. Only render_border_top/
render_border_bottom pass an inner_radius; the titlebar's own corner
and the lock-screen box keep their existing solid-disk behaviour,
which is correct for a single flat-coloured panel with nothing of a
different colour underneath needing to show through.
Also generalizes round_top_corners with an explicit center_col
parameter, mirroring the existing center_row shift: the titlebar's own
corner circle was never shifted horizontally to match the border
strip's (only vertically), leaving a border_width-wide sliver of the
titlebar's own misaligned curve poking through at the seam.
border_top_and_titlebar_corners_meet_without_a_seam and
border_top_curve_actually_closes_within_the_side_strips_own_width
updated to match: both now compare the correct corresponding columns
(the titlebar's own buffer starts border_width columns inside the
border strip's), and the latter no longer demands exact 255 opacity at
a point that legitimately sits within the new inner cut's own
antialiasing band.
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The border-strip bitmap's own corner rounding (corners.rs's blend_
corner_pixel) and the client-content mask's corner rounding
(rounded_corners_pixman.rs's apply_corner_mask) are two independent
implementations that need to trace the exact same circle where a
window's border meets its own rounded content. Their falloff math was
already identical (same smoothstep construction over the same
radius-1..radius+1 band), but apply_corner_mask samples each pixel at
its own center (x as f32 + 0.5) - the standard rasterization
convention, matching the GLES shader used for the winit backend --
while blend_corner_pixel sampled at the raw integer coordinate (x as
f32), a systematic half-pixel offset between the two curves.
round_top_corners/round_bottom_corners had a compensating "- 1" baked
into their own right-edge/bottom-edge center calculation, tuned
against the old, uncentered convention. Confirmed live at extreme
zoom: a small but real right-angle step partway along an otherwise
smooth arc, right where the two curves are supposed to meet --
reported as "squares on the inside corners of each vertex."
Added the missing + 0.5 to blend_corner_pixel and removed the two
compensating "- 1"s (both call sites), which now line up exactly with
apply_corner_mask's own clamp-derived center for the same corner
(width - r / height - r, not width - r - 1 / height - r - 1). All 378
existing tests pass unchanged - none of them assert exact pixel
positions this shifts by half a pixel.
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Safety commit before reconciling this worktree with main, which has
diverged with its own separate fixes today. Nothing here is reviewed
or curated yet - this exists purely so none of this work can be lost
to a git operation, disk issue, or worktree cleanup while that
reconciliation happens.
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