Implement support for stamp annotations

Author: timvandermeij

src/core/annotation.js

@@ -99,6 +99,9 @@ class AnnotationFactory {
       case 'StrikeOut':
         return new StrikeOutAnnotation(parameters);
 
+      case 'Stamp':
+        return new StampAnnotation(parameters);
+
       case 'FileAttachment':
         return new FileAttachmentAnnotation(parameters);
 
@@ -946,6 +949,15 @@ class StrikeOutAnnotation extends Annotation {
   }
 }
 
+class StampAnnotation extends Annotation {
+  constructor(parameters) {
+    super(parameters);
+
+    this.data.annotationType = AnnotationType.STAMP;
+    this._preparePopup(parameters.dict);
+  }
+}
+
 class FileAttachmentAnnotation extends Annotation {
   constructor(parameters) {
     super(parameters);

src/display/annotation_layer.js

@@ -92,6 +92,9 @@ class AnnotationElementFactory {
       case AnnotationType.STRIKEOUT:
         return new StrikeOutAnnotationElement(parameters);
 
+      case AnnotationType.STAMP:
+        return new StampAnnotationElement(parameters);
+
       case AnnotationType.FILEATTACHMENT:
         return new FileAttachmentAnnotationElement(parameters);
 
@@ -1004,6 +1007,30 @@ class StrikeOutAnnotationElement extends AnnotationElement {
   }
 }
 
+class StampAnnotationElement extends AnnotationElement {
+  constructor(parameters) {
+    let isRenderable = !!(parameters.data.hasPopup ||
+                          parameters.data.title || parameters.data.contents);
+    super(parameters, isRenderable, /* ignoreBorder = */ true);
+  }
+
+  /**
+   * Render the stamp annotation's HTML element in the empty container.
+   *
+   * @public
+   * @memberof StampAnnotationElement
+   * @returns {HTMLSectionElement}
+   */
+  render() {
+    this.container.className = 'stampAnnotation';
+
+    if (!this.data.hasPopup) {
+      this._createPopup(this.container, null, this.data);
+    }
+    return this.container;
+  }
+}
+
 class FileAttachmentAnnotationElement extends AnnotationElement {
   constructor(parameters) {
     super(parameters, /* isRenderable = */ true);

test/pdfs/.gitignore

@@ -285,6 +285,7 @@
 !annotation-highlight.pdf
 !annotation-line.pdf
 !annotation-square-circle.pdf
+!annotation-stamp.pdf
 !annotation-fileattachment.pdf
 !annotation-text-widget.pdf
 !annotation-choice-widget.pdf

test/pdfs/annotation-stamp.pdf

@@ -3583,6 +3583,13 @@
        "type": "eq",
        "annotations": true
     },
+    {  "id": "annotation-stamp",
+       "file": "pdfs/annotation-stamp.pdf",
+       "md5": "0a04d7ce1ad103cb3c033d26855d6ec7",
+       "rounds": 1,
+       "type": "eq",
+       "annotations": true
+    },
     {  "id": "annotation-fileattachment",
        "file": "pdfs/annotation-fileattachment.pdf",
        "md5": "d20ecee4b53c81b2dd44c8715a1b4a83",

test/test_manifest.json

@@ -191,6 +191,7 @@
 .annotationLayer .lineAnnotation svg line,
 .annotationLayer .squareAnnotation svg rect,
 .annotationLayer .circleAnnotation svg ellipse,
+.annotationLayer .stampAnnotation,
 .annotationLayer .fileAttachmentAnnotation {
   cursor: pointer;
 }