Refactor annotation flags code

src/core/annotation.js

@@ -15,7 +15,8 @@
 /* globals PDFJS, Util, isDict, isName, stringToPDFString, warn, Dict, Stream,
            stringToBytes, Promise, isArray, ObjectLoader, OperatorList,
            isValidUrl, OPS, createPromiseCapability, AnnotationType,
-           stringToUTF8String, AnnotationBorderStyleType, ColorSpace */
+           stringToUTF8String, AnnotationBorderStyleType, ColorSpace,
+           AnnotationFlag, isInt */
 
 'use strict';
 
@@ -121,7 +122,8 @@ var Annotation = (function AnnotationClosure() {
     var data = this.data = {};
 
     data.subtype = dict.get('Subtype').name;
-    data.annotationFlags = dict.get('F');
+
+    this.setFlags(dict.get('F'));
 
     this.setRectangle(dict.get('Rect'));
     data.rect = this.rectangle;
@@ -138,6 +140,64 @@ var Annotation = (function AnnotationClosure() {
   }
 
   Annotation.prototype = {
+    /**
+     * @return {boolean}
+     */
+    get viewable() {
+      if (this.flags) {
+        return !this.hasFlag(AnnotationFlag.INVISIBLE) &&
+               !this.hasFlag(AnnotationFlag.HIDDEN) &&
+               !this.hasFlag(AnnotationFlag.NOVIEW);
+      }
+      return true;
+    },
+
+    /**
+     * @return {boolean}
+     */
+    get printable() {
+      if (this.flags) {
+        return this.hasFlag(AnnotationFlag.PRINT) &&
+               !this.hasFlag(AnnotationFlag.INVISIBLE) &&
+               !this.hasFlag(AnnotationFlag.HIDDEN);
+      }
+      return false;
+    },
+
+    /**
+     * Set the flags.
+     *
+     * @public
+     * @memberof Annotation
+     * @param {number} flags - Unsigned 32-bit integer specifying annotation
+     *                         characteristics
+     * @see {@link shared/util.js}
+     */
+    setFlags: function Annotation_setFlags(flags) {
+      if (isInt(flags)) {
+        this.flags = flags;
+      } else {
+        this.flags = 0;
+      }
+    },
+
+    /**
+     * Check if a provided flag is set.
+     *
+     * @public
+     * @memberof Annotation
+     * @param {number} flag - Hexadecimal representation for an annotation
+     *                        characteristic
+     * @return {boolean}
+     * @see {@link shared/util.js}
+     */
+    hasFlag: function Annotation_hasFlag(flag) {
+      if (this.flags) {
+        return (this.flags & flag) > 0;
+      }
+      return false;
+    },
+
     /**
      * Set the rectangle.
      *
@@ -237,32 +297,6 @@ var Annotation = (function AnnotationClosure() {
       }
     },
 
-    isInvisible: function Annotation_isInvisible() {
-      var data = this.data;
-      return !!(data &&
-                data.annotationFlags &&            // Default: not invisible
-                data.annotationFlags & 0x1);       // Invisible
-    },
-
-    isViewable: function Annotation_isViewable() {
-      var data = this.data;
-      return !!(!this.isInvisible() &&
-                data &&
-                (!data.annotationFlags ||
-                 !(data.annotationFlags & 0x22)) &&  // Hidden or NoView
-                data.rect);                          // rectangle is necessary
-    },
-
-    isPrintable: function Annotation_isPrintable() {
-      var data = this.data;
-      return !!(!this.isInvisible() &&
-                data &&
-                data.annotationFlags &&              // Default: not printable
-                data.annotationFlags & 0x4 &&        // Print
-                !(data.annotationFlags & 0x2) &&     // Hidden
-                data.rect);                          // rectangle is necessary
-    },
-
     loadResources: function Annotation_loadResources(keys) {
       return new Promise(function (resolve, reject) {
         this.appearance.dict.getAsync('Resources').then(function (resources) {
@@ -329,8 +363,8 @@ var Annotation = (function AnnotationClosure() {
 
     var annotationPromises = [];
     for (var i = 0, n = annotations.length; i < n; ++i) {
-      if (intent === 'display' && annotations[i].isViewable() ||
-          intent === 'print' && annotations[i].isPrintable()) {
+      if (intent === 'display' && annotations[i].viewable ||
+          intent === 'print' && annotations[i].printable) {
         annotationPromises.push(
           annotations[i].getOperatorList(partialEvaluator, task));
       }
@@ -506,6 +540,12 @@ var WidgetAnnotation = (function WidgetAnnotationClosure() {
     data.fieldFlags = Util.getInheritableProperty(dict, 'Ff') || 0;
     this.fieldResources = Util.getInheritableProperty(dict, 'DR') || Dict.empty;
 
+    // Hide unsupported Widget signatures.
+    if (data.fieldType === 'Sig') {
+      warn('unimplemented annotation type: Widget signature');
+      this.setFlags(AnnotationFlag.HIDDEN);
+    }
+
     // Building the full field name by collecting the field and
     // its ancestors 'T' data and joining them using '.'.
     var fieldName = [];
@@ -539,17 +579,7 @@ var WidgetAnnotation = (function WidgetAnnotationClosure() {
     data.fullName = fieldName.join('.');
   }
 
-  var parent = Annotation.prototype;
-  Util.inherit(WidgetAnnotation, Annotation, {
-    isViewable: function WidgetAnnotation_isViewable() {
-      if (this.data.fieldType === 'Sig') {
-        warn('unimplemented annotation type: Widget signature');
-        return false;
-      }
-
-      return parent.isViewable.call(this);
-    }
-  });
+  Util.inherit(WidgetAnnotation, Annotation, {});
 
   return WidgetAnnotation;
 })();

src/core/core.js

@@ -268,8 +268,7 @@ var Page = (function PageClosure() {
       for (var i = 0, n = annotationRefs.length; i < n; ++i) {
         var annotationRef = annotationRefs[i];
         var annotation = annotationFactory.create(this.xref, annotationRef);
-        if (annotation &&
-            (annotation.isViewable() || annotation.isPrintable())) {
+        if (annotation && (annotation.viewable || annotation.printable)) {
           annotations.push(annotation);
         }
       }

src/shared/util.js

@@ -48,6 +48,19 @@ var AnnotationType = {
   LINK: 3
 };
 
+var AnnotationFlag = {
+  INVISIBLE: 0x01,
+  HIDDEN: 0x02,
+  PRINT: 0x04,
+  NOZOOM: 0x08,
+  NOROTATE: 0x10,
+  NOVIEW: 0x20,
+  READONLY: 0x40,
+  LOCKED: 0x80,
+  TOGGLENOVIEW: 0x100,
+  LOCKEDCONTENTS: 0x200
+};
+
 var AnnotationBorderStyleType = {
   SOLID: 1,
   DASHED: 2,

test/unit/annotation_layer_spec.js

@@ -1,10 +1,31 @@
 /* globals expect, it, describe, Dict, Name, Annotation, AnnotationBorderStyle,
-           AnnotationBorderStyleType */
+           AnnotationBorderStyleType, AnnotationFlag */
 
 'use strict';
 
 describe('Annotation layer', function() {
   describe('Annotation', function() {
+    it('should set and get flags', function() {
+      var dict = new Dict();
+      dict.set('Subtype', '');
+      var annotation = new Annotation({ dict: dict, ref: 0 });
+      annotation.setFlags(13);
+
+      expect(annotation.hasFlag(AnnotationFlag.INVISIBLE)).toEqual(true);
+      expect(annotation.hasFlag(AnnotationFlag.NOZOOM)).toEqual(true);
+      expect(annotation.hasFlag(AnnotationFlag.PRINT)).toEqual(true);
+      expect(annotation.hasFlag(AnnotationFlag.READONLY)).toEqual(false);
+    });
+
+    it('should be viewable and not printable by default', function() {
+      var dict = new Dict();
+      dict.set('Subtype', '');
+      var annotation = new Annotation({ dict: dict, ref: 0 });
+
+      expect(annotation.viewable).toEqual(true);
+      expect(annotation.printable).toEqual(false);
+    });
+
     it('should set and get a valid rectangle', function() {
       var dict = new Dict();
       dict.set('Subtype', '');