feat(text): move shaping and render planning into Rust

.github/workflows/ci.yml

@@ -8,12 +8,50 @@ on:
 
 permissions:
   contents: read
+  # GitHub models issue/PR comments as pull-request metadata. This permits the
+  # size reporter to update its PR comment; it cannot write repository content.
+  pull-requests: write
 
 concurrency:
   group: ci-${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
 jobs:
+  size:
+    name: Package size report
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+    env:
+      CI: true
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Install canonical toolchain
+        uses: jdx/mise-action@9e7f7633ff6f6d6048a9418a68d48f288f50eb14 # v4.2.3
+        with:
+          version: 2026.7.13
+          cache: true
+
+      - name: Install locked dependencies
+        run: pnpm install --frozen-lockfile
+
+      - name: Compare package delivery sizes with the PR base
+        uses: andresz1/size-limit-action@94bc357df29c36c8f8d50ea497c3e225c3c95d1d # v1.8.0
+        with:
+          github_token: ${{ secrets.GITHUB_TOKEN }}
+          build_script: build
+          skip_step: install
+          package_manager: pnpm
+          # The action runs this command in both revisions. The inline adapter
+          # accepts the base branch's older report, derives the same core total,
+          # and emits Size Limit's stable [{ name, size }] protocol.
+          script: >-
+            sh -c "node apps/benchmarks/scripts/measure-package-sizes.mts |
+            node -e \"let input='';process.stdin.on('data',chunk=>input+=chunk).on('end',()=>{const report=JSON.parse(input);const entries=report.entries.filter(entry=>entry.status==='measured');const byId=new Map(entries.map(entry=>[entry.id,entry]));if(!byId.has('renderer-neutral-core-total')){const js=byId.get('browser-core');const wasm=byId.get('text-shaper-wasm');if(js&&wasm)byId.set('renderer-neutral-core-total',{id:'renderer-neutral-core-total',format:'aggregate',gzipBytes:js.gzipBytes+wasm.gzipBytes,brotliBytes:js.brotliBytes+wasm.brotliBytes})}const tracked=/^(browser-core|text-shaper-wasm|renderer-neutral-core-total|three-runtime-js|three-renderer-total|font-(inter|icons)-|delivery-three-)/;const rows=[...byId.values()].filter(entry=>tracked.test(entry.id)).flatMap(entry=>entry.format==='javascript'?[{name:entry.id+' (brotli)',size:entry.brotliBytes}]:entry.format==='aggregate'?[{name:entry.id+' (gzip)',size:entry.gzipBytes},{name:entry.id+' (brotli)',size:entry.brotliBytes}]:[{name:entry.id+' (raw)',size:entry.rawBytes},{name:entry.id+' (gzip)',size:entry.gzipBytes},{name:entry.id+' (brotli)',size:entry.brotliBytes}]);process.stdout.write(JSON.stringify(rows))})\""
+
   check:
     name: Check
     runs-on: ubuntu-24.04
@@ -44,7 +82,10 @@ jobs:
         run: pnpm install --frozen-lockfile
 
       - name: Provision authenticated HarfBuzz utilities
-        run: pnpm scripts run fixture:harfbuzz:provision
+        run: |
+          pnpm scripts run fixture:harfbuzz:provision
+          mise -C apps/benchmarks exec -- node ./scripts/provision-harfbuzz.mts --version=14.2.0
+          printf '%s\n' "$GITHUB_WORKSPACE/apps/benchmarks/.cache/harfbuzz/14.2.0/build/util" >> "$GITHUB_PATH"
 
       - name: Select rolling runner Chromium
         shell: bash

apps/benchmarks/fixtures/contracts/paragraph-bidi-layout-v0.json

@@ -570,9 +570,9 @@
         -1.4118552207946777, -1.4118552207946777, -1.4118552207946777, -1.4118552207946777,
         -1.4118552207946777, -1.4118552207946777, -1.4118552207946777, -1.4118552207946777,
         -1.4118552207946777, -1.4118552207946777, -1.4118552207946777, -1.4118552207946777,
-        -1.4118552207946777, -1.4118552207946777, -39.54185104370117, -39.54185104370117,
-        -39.54185104370117, -39.54185104370117, -39.54185104370117, -39.54185104370117,
-        -39.54185104370117, -39.54185104370117, -39.54185104370117
+        -1.4118552207946777, -1.4118552207946777, -39.5418586730957, -39.5418586730957,
+        -39.5418586730957, -39.5418586730957, -39.5418586730957, -39.5418586730957,
+        -39.5418586730957, -39.5418586730957, -39.5418586730957
       ],
       "layout": {
         "measurement": {
@@ -581,10 +581,10 @@
           "contentWidth": 345.40478515625,
           "contentHeight": 114.39000000000001,
           "firstBaseline": 30.341856002807617,
-          "lastBaseline": 106.60185241699219,
+          "lastBaseline": 106.60186004638672,
           "overflowed": false
         },
-        "hash": "c1a7730c",
+        "hash": "64cd57ec",
         "glyphIds": [
           790, 647, 647, 689, 586, 614, 1777, 2, 456, 2, 411, 2, 384, 1777, 586, 507, 647, 618,
           1777, 1462, 1777, 647, 647, 689, 1501, 1777, 727, 614, 852, 773, 689, 773, 658, 1501,
@@ -612,7 +612,7 @@
         "lineTextEnds": [22, 47, 56],
         "lineGlyphStarts": [0, 21, 46],
         "lineGlyphCounts": [21, 25, 9],
-        "lineBaselines": [30.341856002807617, 68.47185516357422, 106.60185241699219],
+        "lineBaselines": [30.341856002807617, 68.47185516357422, 106.60186004638672],
         "lineAdvances": [329.556640625, 345.40478515625, 146.17529296875]
       }
     }