Use the cidToGidMap, if it exists, when building the glyph mapping for non-embedded composite fonts (issue 12418)

src/core/fonts.js

@@ -622,7 +622,7 @@ var Font = (function FontClosure() {
         // attempting to recover by assuming that no file exists.
         warn('Font file is empty in "' + name + '" (' + this.loadedName + ")");
       }
-      this.fallbackToSystemFont();
+      this.fallbackToSystemFont(properties);
       return;
     }
 
@@ -679,7 +679,7 @@ var Font = (function FontClosure() {
       }
     } catch (e) {
       warn(e);
-      this.fallbackToSystemFont();
+      this.fallbackToSystemFont(properties);
       return;
     }
 
@@ -1308,7 +1308,7 @@ var Font = (function FontClosure() {
       return data;
     },
 
-    fallbackToSystemFont: function Font_fallbackToSystemFont() {
+    fallbackToSystemFont(properties) {
       this.missingFile = true;
       // The file data is not specified. Trying to fix the font name
       // to be used with the canvas.font.
@@ -1339,7 +1339,8 @@ var Font = (function FontClosure() {
         type === "CIDFontType2" &&
         this.cidEncoding.startsWith("Identity-")
       ) {
-        const GlyphMapForStandardFonts = getGlyphMapForStandardFonts();
+        const GlyphMapForStandardFonts = getGlyphMapForStandardFonts(),
+          cidToGidMap = properties.cidToGidMap;
         // Standard fonts might be embedded as CID font without glyph mapping.
         // Building one based on GlyphMapForStandardFonts.
         const map = [];
@@ -1357,6 +1358,16 @@ var Font = (function FontClosure() {
             map[+charCode] = SupplementalGlyphMapForCalibri[charCode];
           }
         }
+        // Always update the glyph mapping with the `cidToGidMap` when it exists
+        // (fixes issue12418_reduced.pdf).
+        if (cidToGidMap) {
+          for (const charCode in map) {
+            const cid = map[charCode];
+            if (cidToGidMap[cid] !== undefined) {
+              map[+charCode] = cidToGidMap[cid];
+            }
+          }
+        }
 
         var isIdentityUnicode = this.toUnicode instanceof IdentityToUnicodeMap;
         if (!isIdentityUnicode) {

test/pdfs/.gitignore

@@ -370,6 +370,7 @@
 !annotation-squiggly-without-appearance.pdf
 !annotation-highlight.pdf
 !annotation-highlight-without-appearance.pdf
+!issue12418_reduced.pdf
 !annotation-freetext.pdf
 !annotation-line.pdf
 !annotation-square-circle.pdf

test/test_manifest.json

@@ -1440,6 +1440,12 @@
        "rounds": 1,
        "type": "eq"
     },
+    {  "id": "issue12418",
+       "file": "pdfs/issue12418_reduced.pdf",
+       "md5": "596b70f00a5f88ff58f4f4d06fcf75f1",
+       "rounds": 1,
+       "type": "eq"
+    },
     {  "id": "issue6692",
        "file": "pdfs/issue6692.pdf",
        "md5": "ba078e0ddd59cda4b6c51ea10599f49a",