Use FDSelect and FDArray when converting CFF CID font to paths

src/core/font_renderer.js

@@ -14,7 +14,7 @@
  */
 
 import {
-   bytesToString, FormatError, unreachable, Util
+  bytesToString, FONT_IDENTITY_MATRIX, FormatError, unreachable, Util, warn
 } from '../shared/util';
 import { CFFParser } from './cff_parser';
 import { getGlyphsUnicode } from './glyphlist';
@@ -91,6 +91,9 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
       subrs: (cff.topDict.privateDict && cff.topDict.privateDict.subrsIndex &&
               cff.topDict.privateDict.subrsIndex.objects),
       gsubrs: cff.globalSubrIndex && cff.globalSubrIndex.objects,
+      isCFFCIDFont: cff.isCIDFont,
+      fdSelect: cff.fdSelect,
+      fdArray: cff.fdArray,
     };
   }
 
@@ -293,7 +296,7 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
     }
   }
 
-  function compileCharString(code, cmds, font) {
+  function compileCharString(code, cmds, font, glyphId) {
     var stack = [];
     var x = 0, y = 0;
     var stems = 0;
@@ -366,8 +369,28 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
             }
             break;
           case 10: // callsubr
-            n = stack.pop() + font.subrsBias;
-            subrCode = font.subrs[n];
+            n = stack.pop();
+            subrCode = null;
+            if (font.isCFFCIDFont) {
+              let fdIndex = font.fdSelect.getFDIndex(glyphId);
+              if (fdIndex >= 0 && fdIndex < font.fdArray.length) {
+                let fontDict = font.fdArray[fdIndex], subrs;
+                if (fontDict.privateDict && fontDict.privateDict.subrsIndex) {
+                  subrs = fontDict.privateDict.subrsIndex.objects;
+                }
+                if (subrs) {
+                  let numSubrs = subrs.length;
+                  // Add subroutine bias.
+                  n += numSubrs < 1240 ? 107 :
+                       (numSubrs < 33900 ? 1131 : 32768);
+                  subrCode = subrs[n];
+                }
+              } else {
+                warn('Invalid fd index for glyph index.');
+              }
+            } else {
+              subrCode = font.subrs[n + font.subrsBias];
+            }
             if (subrCode) {
               parse(subrCode);
             }
@@ -438,12 +461,14 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
               cmds.push({ cmd: 'translate', args: [x, y], });
               var cmap = lookupCmap(font.cmap, String.fromCharCode(
                 font.glyphNameMap[StandardEncoding[achar]]));
-              compileCharString(font.glyphs[cmap.glyphId], cmds, font);
+              compileCharString(font.glyphs[cmap.glyphId], cmds, font,
+                                cmap.glyphId);
               cmds.push({ cmd: 'restore', });
 
               cmap = lookupCmap(font.cmap, String.fromCharCode(
                 font.glyphNameMap[StandardEncoding[bchar]]));
-              compileCharString(font.glyphs[cmap.glyphId], cmds, font);
+              compileCharString(font.glyphs[cmap.glyphId], cmds, font,
+                                cmap.glyphId);
             }
             return;
           case 18: // hstemhm
@@ -603,7 +628,7 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
       var cmap = lookupCmap(this.cmap, unicode);
       var fn = this.compiledGlyphs[cmap.glyphId];
       if (!fn) {
-        fn = this.compileGlyph(this.glyphs[cmap.glyphId]);
+        fn = this.compileGlyph(this.glyphs[cmap.glyphId], cmap.glyphId);
         this.compiledGlyphs[cmap.glyphId] = fn;
       }
       if (this.compiledCharCodeToGlyphId[cmap.charCode] === undefined) {
@@ -612,17 +637,30 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
       return fn;
     },
 
-    compileGlyph(code) {
+    compileGlyph(code, glyphId) {
       if (!code || code.length === 0 || code[0] === 14) {
         return noop;
       }
 
+      let fontMatrix = this.fontMatrix;
+      if (this.isCFFCIDFont) {
+        // Top DICT's FontMatrix can be ignored because CFFCompiler always
+        // removes it and copies to FDArray DICTs.
+        let fdIndex = this.fdSelect.getFDIndex(glyphId);
+        if (fdIndex >= 0 && fdIndex < this.fdArray.length) {
+          let fontDict = this.fdArray[fdIndex];
+          fontMatrix = fontDict.getByName('FontMatrix') || FONT_IDENTITY_MATRIX;
+        } else {
+          warn('Invalid fd index for glyph index.');
+        }
+      }
+
       var cmds = [];
       cmds.push({ cmd: 'save', });
-      cmds.push({ cmd: 'transform', args: this.fontMatrix.slice(), });
+      cmds.push({ cmd: 'transform', args: fontMatrix.slice(), });
       cmds.push({ cmd: 'scale', args: ['size', '-size'], });
 
-      this.compileGlyphImpl(code, cmds);
+      this.compileGlyphImpl(code, cmds, glyphId);
 
       cmds.push({ cmd: 'restore', });
 
@@ -668,11 +706,15 @@ var FontRendererFactory = (function FontRendererFactoryClosure() {
                        107 : (this.gsubrs.length < 33900 ? 1131 : 32768));
     this.subrsBias = (this.subrs.length < 1240 ?
                       107 : (this.subrs.length < 33900 ? 1131 : 32768));
+
+    this.isCFFCIDFont = cffInfo.isCFFCIDFont;
+    this.fdSelect = cffInfo.fdSelect;
+    this.fdArray = cffInfo.fdArray;
   }
 
   Util.inherit(Type2Compiled, CompiledFont, {
-    compileGlyphImpl(code, cmds) {
-      compileCharString(code, cmds, this);
+    compileGlyphImpl(code, cmds, glyphId) {
+      compileCharString(code, cmds, this, glyphId);
     },
   });
 

test/pdfs/.gitignore

@@ -262,6 +262,7 @@
 !issue4573.pdf
 !issue4722.pdf
 !issue4800.pdf
+!text_clip_cff_cid.pdf
 !issue4801.pdf
 !issue5334.pdf
 !bug1186827.pdf

test/test_manifest.json

@@ -2261,6 +2261,12 @@
       "link": true,
       "type": "eq"
     },
+    { "id": "text_clip_cff_cid",
+      "file": "pdfs/text_clip_cff_cid.pdf",
+      "md5": "92d4920586f177cc0e83326e5b5d2ee1",
+      "rounds": 1,
+      "type": "eq"
+    },
     {  "id": "preistabelle",
       "file": "pdfs/preistabelle.pdf",
       "md5": "d2f0b2086160d4f3d325c79a5dc1fb4d",