Initial commit: Client Doc docs Server Tools

Co-authored-by: Cursor <cursoragent@cursor.com>
2026-07-10 10:24:29 +08:00
commit 7e35d8da31
3374 changed files with 680813 additions and 0 deletions
@@ -0,0 +1,41 @@
+import { toBytesInt32 } from './util';
+export default function readMetrics(arrayBuffer) {
+    const font = new DataView(arrayBuffer);
+    const tableCount = font.getUint16(4);
+    const ppem = 1; 
+    let ascent = 0;
+    let descent = 0;
+    let lineGap = 0;
+    let unitsPerEm;
+    for (let i = 0; i < tableCount; i++) {
+        const tag = font.getUint32(12 + i * 16);
+        const tagStr = toBytesInt32(tag);
+        
+        if (tagStr === 'hhea') {
+            const offset = font.getUint32(12 + i * 16 + 8);
+            const length = font.getUint32(12 + i * 16 + 12);
+            
+            const hhea = new DataView(arrayBuffer, offset, length);
+            ascent = hhea.getInt16(4);
+            descent = hhea.getInt16(6);
+            lineGap = hhea.getInt16(8);
+        }
+        else if (tagStr === 'head') {
+            const offset = font.getUint32(12 + i * 16 + 8);
+            const length = font.getUint32(12 + i * 16 + 12);
+            
+            const head = new DataView(arrayBuffer, offset, length);
+            unitsPerEm = head.getUint16(18);
+        }
+    }
+    if (!ascent || !descent || !unitsPerEm) {
+        
+        return undefined;
+    }
+    return {
+        ascent: ascent * ppem / unitsPerEm,
+        descent: descent * ppem / unitsPerEm,
+        lineGap: lineGap * ppem / unitsPerEm,
+        unitsPerEm,
+    };
+}