feat: visual parity with the original Ghostty (pixel-diff pipeline)
Adds scripts/visual-parity.sh (`just visual-parity`): launches the installed Ghostty 1.3.1 and the Rust build in an isolated headless nested weston (GL renderer, Mesa forced, weston-screenshooter via --debug), with identical isolated config, a deterministic test page (ASCII, ligatures, all SGR styles and underline kinds, 16/256/truecolor, box/block/braille/powerline/nerd icons, CJK, emoji, wide chars, cursor) and a tabs+splits scenario driven through Xwayland, then diffs the captures (terminal area and chrome separately, heatmaps). Fixes found by comparing against the original: - A pane stayed blank after a nested split: the GTK render path called draw_frame(false) where Ghostty uses drawFrame(true) (a re-realized GLArea has a new swap chain that nothing else redraws). - Sprite glyph antialiasing now ports z2d's default 4x4 multisample rasterizer instead of tiny-skia's analytic coverage (pixels differing from Ghostty's reference sprite sheets: 5.76% -> 1.20%, none off by more than 96 levels); the sheet test tolerance is tightened to 0.1%. Result vs Ghostty 1.3.1: test page 0.020% of pixels differ (196 px at curly-underline ends and diagonal box strokes, max delta 86 levels); tabs+splits and headerbar/tab bar are bit-identical. Details in docs/rewrite/notes/visual-parity-VP.md. Test Plan: - just visual-parity (needs weston, weston-screenshooter, xdotool) - cargo test -p ghostty-font (sprite sheet comparison)
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#!/usr/bin/env bash
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# Visual parity: capture original Ghostty and the Rust build in an isolated,
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# headless nested weston and compare pixel-wise.
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#
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# scripts/visual-parity.sh [scenario...] (default: page page-bar tabs)
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#
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# env: RUST_BIN (default target/production/ghostty), REF_BIN (default
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# /usr/bin/ghostty), OUT (default target/visual-parity), W/H output size.
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# Output: $OUT/<scenario>/{ref,rust,diff}.png (+ chrome/term crops) and stats.txt.
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set -u
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ROOT=$(cd "$(dirname "$0")/.." && pwd)
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RUST_BIN=${RUST_BIN:-$ROOT/target/production/ghostty}
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REF_BIN=${REF_BIN:-/usr/bin/ghostty}
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OUT=${OUT:-$ROOT/target/visual-parity}
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W=${W:-1200}; H=${H:-800}
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VP=$ROOT/scripts/visual-parity
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SCEN=${*:-page page-bar tabs}
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mkdir -p "$OUT"
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export XDG_RUNTIME_DIR=${VP_RUNTIME_DIR:-/tmp/vp-runtime-$UID}
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mkdir -p -m700 "$XDG_RUNTIME_DIR"
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WORK=$(mktemp -d "$OUT/work.XXXX")
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SOCK=vp$$
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XWL=
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case " $SCEN " in *" tabs "*) XWL=xwayland=true; mkdir -p /tmp/.X11-unix ;; esac
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cat >"$WORK/weston.ini" <<INI
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[core]
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shell=desktop-shell.so
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$XWL
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[output]
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name=headless
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mode=${W}x${H}
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[shell]
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panel-position=none
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background-color=0xff202020
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INI
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__EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/50_mesa.json XWAYLAND_NO_GLAMOR=1 weston --debug --backend=headless --renderer=gl --socket=$SOCK -c "$WORK/weston.ini" \
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>"$WORK/weston.log" 2>&1 &
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WPID=$!
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trap 'kill $WPID 2>/dev/null; wait 2>/dev/null' EXIT
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for _ in $(seq 50); do [ -S "$XDG_RUNTIME_DIR/$SOCK" ] && break; sleep 0.1; done
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sleep 1
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write_cfg() { # dir, extra
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mkdir -p "$1/ghostty"
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cat >"$1/ghostty/config" <<CFG
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font-family = JetBrains Mono
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font-size = 13
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background = 1e1e2e
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foreground = cdd6f4
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maximize = true
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window-padding-x = 8
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window-padding-y = 8
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cursor-style = block
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cursor-style-blink = false
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window-theme = dark
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title = Ghostty
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confirm-close-surface = false
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shell-integration = none
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quit-after-last-window-closed = true
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$2
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CFG
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}
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shoot() { # outfile
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local d; d=$(mktemp -d "$WORK/shot.XXXX")
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(cd "$d" && WAYLAND_DISPLAY=$SOCK timeout 20 weston-screenshooter >/dev/null 2>&1)
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mv "$d"/*.png "$1" && rmdir "$d"
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}
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# run BIN LABEL SCENARIO OUTPNG
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run_one() {
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local bin=$1 label=$2 scen=$3 out=$4 cfgx=""
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local cfg="$WORK/cfg-$label-$scen"
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case $scen in page-bar) cfgx="cursor-style = bar" ;; esac
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write_cfg "$cfg" "$cfgx"
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local env=(LANG=C.UTF-8 XDG_RUNTIME_DIR=$XDG_RUNTIME_DIR WAYLAND_DISPLAY=$SOCK XDG_CONFIG_HOME=$cfg GSETTINGS_BACKEND=memory
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DBUS_SESSION_BUS_ADDRESS=unix:path=/nonexistent GDK_BACKEND=wayland
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HOME=$WORK/home-$label)
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mkdir -p "$WORK/home-$label"
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case $scen in
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tabs)
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# Needs input: run under Xwayland and drive with xdotool.
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env=("${env[@]/GDK_BACKEND=wayland/GDK_BACKEND=x11}")
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env+=(DISPLAY="$(xwl_display)")
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env -i PATH="$PATH" "${env[@]}" timeout 60 "$bin" --gtk-single-instance=false \
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-e "$VP/testpage.sh" >"$WORK/$label-$scen.log" 2>&1 &
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local pid=$!
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sleep 6
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xdotool_keys
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sleep 3
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shoot "$out"
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kill $pid 2>/dev/null; wait $pid 2>/dev/null
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;;
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*)
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env -i PATH="$PATH" "${env[@]}" timeout 60 "$bin" --gtk-single-instance=false \
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-e "$VP/testpage.sh" >"$WORK/$label-$scen.log" 2>&1 &
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local pid=$!
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sleep 7
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shoot "$out"
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kill $pid 2>/dev/null; wait $pid 2>/dev/null
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;;
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esac
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}
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xwl_display() { grep -o "display :[0-9]*" "$WORK/weston.log" | tail -1 | sed 's/display //'; }
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xdotool_keys() {
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export DISPLAY=$(xwl_display)
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xdotool key --clearmodifiers ctrl+shift+t; sleep 1
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xdotool key --clearmodifiers ctrl+shift+o; sleep 1
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xdotool key --clearmodifiers ctrl+shift+e; sleep 1
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}
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: >"$OUT/stats.txt"
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for s in $SCEN; do
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mkdir -p "$OUT/$s"
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run_one "$REF_BIN" ref "$s" "$OUT/$s/ref.png"
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run_one "$RUST_BIN" rust "$s" "$OUT/$s/rust.png"
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python3 "$VP/compare.py" "$OUT/$s/ref.png" "$OUT/$s/rust.png" "$OUT/$s/diff.png" --name "$s/full" | tee -a "$OUT/stats.txt"
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# terminal area: window content below the headerbar; chrome: the headerbar strip.
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# Window geometry is deterministic under desktop-shell; override with TERM_CROP / CHROME_CROP.
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python3 "$VP/compare.py" "$OUT/$s/ref.png" "$OUT/$s/rust.png" "$OUT/$s/diff-term.png" \
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--crop "${TERM_CROP:-0,48,1200,752}" --name "$s/terminal" | tee -a "$OUT/stats.txt"
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python3 "$VP/compare.py" "$OUT/$s/ref.png" "$OUT/$s/rust.png" "$OUT/$s/diff-chrome.png" \
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--crop "${CHROME_CROP:-0,0,1200,48}" --name "$s/chrome" | tee -a "$OUT/stats.txt"
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done
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[ -n "${KEEP:-}" ] || rm -rf "$WORK"
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