Fallback font for buttons must be ZapfDingbats.

Fix bug https://bugzilla.mozilla.org/show_bug.cgi?id=1669099.

src/core/annotation.js

@@ -26,6 +26,7 @@ import {
   getModificationDate,
   isString,
   OPS,
+  shadow,
   stringToPDFString,
   unreachable,
   Util,
@@ -281,6 +282,8 @@ class Annotation {
       rect: this.rectangle,
       subtype: params.subtype,
     };
+
+    this._fallbackFontDict = null;
   }
 
   /**
@@ -576,6 +579,7 @@ class Annotation {
           task,
           resources,
           operatorList: opList,
+          fallbackFontDict: this._fallbackFontDict,
         })
         .then(() => {
           opList.addOp(OPS.endAnnotation, []);
@@ -1873,6 +1877,7 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
     if (this.uncheckedAppearance) {
       this._streams.push(this.uncheckedAppearance);
     }
+    this._fallbackFontDict = this.fallbackFontDict;
   }
 
   _processRadioButton(params) {
@@ -1912,6 +1917,7 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
     if (this.uncheckedAppearance) {
       this._streams.push(this.uncheckedAppearance);
     }
+    this._fallbackFontDict = this.fallbackFontDict;
   }
 
   _processPushButton(params) {
@@ -1954,6 +1960,16 @@ class ButtonWidgetAnnotation extends WidgetAnnotation {
       type,
     };
   }
+
+  get fallbackFontDict() {
+    const dict = new Dict();
+    dict.set("BaseFont", Name.get("ZapfDingbats"));
+    dict.set("Type", Name.get("FallbackType"));
+    dict.set("Subtype", Name.get("FallbackType"));
+    dict.set("Encoding", Name.get("ZapfDingbatsEncoding"));
+
+    return shadow(this, "fallbackFontDict", dict);
+  }
 }
 
 class ChoiceWidgetAnnotation extends WidgetAnnotation {

src/core/evaluator.js

@@ -777,7 +777,15 @@ class PartialEvaluator {
       });
   }
 
-  handleSetFont(resources, fontArgs, fontRef, operatorList, task, state) {
+  handleSetFont(
+    resources,
+    fontArgs,
+    fontRef,
+    operatorList,
+    task,
+    state,
+    fallbackFontDict = null
+  ) {
     // TODO(mack): Not needed?
     var fontName,
       fontSize = 0;
@@ -787,7 +795,7 @@ class PartialEvaluator {
       fontSize = fontArgs[1];
     }
 
-    return this.loadFont(fontName, fontRef, resources)
+    return this.loadFont(fontName, fontRef, resources, fallbackFontDict)
       .then(translated => {
         if (!translated.font.isType3Font) {
           return translated;
@@ -978,7 +986,7 @@ class PartialEvaluator {
     });
   }
 
-  loadFont(fontName, font, resources) {
+  loadFont(fontName, font, resources, fallbackFontDict = null) {
     const errorFont = async () => {
       return new TranslatedFont({
         loadedName: "g_font_error",
@@ -1020,7 +1028,11 @@ class PartialEvaluator {
 
       // Falling back to a default font to avoid completely broken rendering,
       // but note that there're no guarantees that things will look "correct".
-      fontRef = PartialEvaluator.fallbackFontDict;
+      if (fallbackFontDict) {
+        fontRef = fallbackFontDict;
+      } else {
+        fontRef = PartialEvaluator.fallbackFontDict;
+      }
     }
 
     if (this.fontCache.has(fontRef)) {
@@ -1351,6 +1363,7 @@ class PartialEvaluator {
     resources,
     operatorList,
     initialState = null,
+    fallbackFontDict = null,
   }) {
     // Ensure that `resources`/`initialState` is correctly initialized,
     // even if the provided parameter is e.g. `null`.
@@ -1531,7 +1544,8 @@ class PartialEvaluator {
                   null,
                   operatorList,
                   task,
-                  stateManager.state
+                  stateManager.state,
+                  fallbackFontDict
                 )
                 .then(function (loadedName) {
                   operatorList.addDependency(loadedName);

test/pdfs/.gitignore

@@ -374,6 +374,7 @@
 !issue12418_reduced.pdf
 !annotation-freetext.pdf
 !annotation-line.pdf
+!bug1669099.pdf
 !annotation-square-circle.pdf
 !annotation-stamp.pdf
 !annotation-fileattachment.pdf

test/test_manifest.json

@@ -4153,6 +4153,20 @@
       "rounds": 1,
       "type": "eq"
     },
+    {  "id": "bug1669099",
+       "file": "pdfs/bug1669099.pdf",
+       "md5": "34421549d58e2b6eeddc674759381f7d",
+       "rounds": 1,
+       "type": "eq",
+       "print": true,
+       "annotationStorage": {
+         "29R": true,
+         "33R": true,
+         "37R": true,
+         "65R": true,
+         "69R": true
+       }
+    },
     {  "id": "issue1171.pdf",
        "file": "pdfs/issue1171.pdf",
        "md5": "2a6188a42a5874c7874b88eebd4acaf0",

test/unit/annotation_spec.js

@@ -2053,6 +2053,65 @@ describe("annotation", function () {
       }, done.fail);
     });
 
+    it("should render checkbox with fallback font for printing", function (done) {
+      const appearanceStatesDict = new Dict();
+      const normalAppearanceDict = new Dict();
+      const checkedAppearanceDict = new Dict();
+      const uncheckedAppearanceDict = new Dict();
+
+      const checkedStream = new StringStream("/ 12 Tf (4) Tj");
+      checkedStream.dict = checkedAppearanceDict;
+
+      const uncheckedStream = new StringStream("");
+      uncheckedStream.dict = uncheckedAppearanceDict;
+
+      checkedAppearanceDict.set("BBox", [0, 0, 8, 8]);
+      checkedAppearanceDict.set("FormType", 1);
+      checkedAppearanceDict.set("Matrix", [1, 0, 0, 1, 0, 0]);
+      normalAppearanceDict.set("Checked", checkedStream);
+      normalAppearanceDict.set("Off", uncheckedStream);
+      appearanceStatesDict.set("N", normalAppearanceDict);
+
+      buttonWidgetDict.set("AP", appearanceStatesDict);
+
+      const buttonWidgetRef = Ref.get(124, 0);
+      const xref = new XRefMock([
+        { ref: buttonWidgetRef, data: buttonWidgetDict },
+      ]);
+      const task = new WorkerTask("test print");
+      partialEvaluator.options = { ignoreErrors: true };
+
+      AnnotationFactory.create(
+        xref,
+        buttonWidgetRef,
+        pdfManagerMock,
+        idFactoryMock
+      )
+        .then(annotation => {
+          const annotationStorage = {};
+          annotationStorage[annotation.data.id] = true;
+          return annotation.getOperatorList(
+            partialEvaluator,
+            task,
+            false,
+            annotationStorage
+          );
+        })
+        .then(opList => {
+          expect(opList.argsArray.length).toEqual(5);
+          expect(opList.fnArray).toEqual([
+            OPS.beginAnnotation,
+            OPS.dependency,
+            OPS.setFont,
+            OPS.showText,
+            OPS.endAnnotation,
+          ]);
+          expect(opList.argsArray[3][0][0].fontChar).toEqual("✔");
+          done();
+        })
+        .catch(done.fail);
+    });
+
     it("should render checkboxes for printing", function (done) {
       const appearanceStatesDict = new Dict();
       const normalAppearanceDict = new Dict();