Add support of Ink annotation

test/pdfs/.gitignore

@@ -272,6 +272,7 @@
 !text_clip_cff_cid.pdf
 !issue4801.pdf
 !issue5334.pdf
+!annotation-caret-ink.pdf
 !bug1186827.pdf
 !issue215.pdf
 !issue5044.pdf

test/test_manifest.json

@@ -1776,6 +1776,13 @@
        "lastPage": 1,
        "type": "load"
     },
+    {  "id": "annotation-caret-ink",
+       "file": "pdfs/annotation-caret-ink.pdf",
+       "md5": "6218ca235580d1975474c979e0128c2d",
+       "rounds": 1,
+       "type": "eq",
+       "annotations": true
+    },
     {  "id": "bug1130815-eq",
        "file": "pdfs/bug1130815.pdf",
        "md5": "3ff3b550c3af766991b2a1b11d00de85",

test/unit/annotation_spec.js

@@ -1435,4 +1435,59 @@ describe('annotation', function() {
       }, done.fail);
     });
   });
+
+  describe('InkAnnotation', function() {
+    it('should handle a single ink list', function(done) {
+      const inkDict = new Dict();
+      inkDict.set('Type', Name.get('Annot'));
+      inkDict.set('Subtype', Name.get('Ink'));
+      inkDict.set('InkList', [[1, 1, 1, 2, 2, 2, 3, 3]]);
+
+      const inkRef = new Ref(142, 0);
+      const xref = new XRefMock([
+        { ref: inkRef, data: inkDict, }
+      ]);
+
+      AnnotationFactory.create(xref, inkRef, pdfManagerMock,
+          idFactoryMock).then(({ data, }) => {
+        expect(data.annotationType).toEqual(AnnotationType.INK);
+        expect(data.inkLists.length).toEqual(1);
+        expect(data.inkLists[0]).toEqual([
+          { x: 1, y: 1, },
+          { x: 1, y: 2, },
+          { x: 2, y: 2, },
+          { x: 3, y: 3, },
+        ]);
+        done();
+      }, done.fail);
+    });
+
+    it('should handle multiple ink lists', function(done) {
+      const inkDict = new Dict();
+      inkDict.set('Type', Name.get('Annot'));
+      inkDict.set('Subtype', Name.get('Ink'));
+      inkDict.set('InkList', [
+        [1, 1, 1, 2],
+        [3, 3, 4, 5],
+      ]);
+
+      const inkRef = new Ref(143, 0);
+      const xref = new XRefMock([
+        { ref: inkRef, data: inkDict, }
+      ]);
+
+      AnnotationFactory.create(xref, inkRef, pdfManagerMock,
+          idFactoryMock).then(({ data, }) => {
+        expect(data.annotationType).toEqual(AnnotationType.INK);
+        expect(data.inkLists.length).toEqual(2);
+        expect(data.inkLists[0]).toEqual([
+          { x: 1, y: 1, }, { x: 1, y: 2, }
+        ]);
+        expect(data.inkLists[1]).toEqual([
+          { x: 3, y: 3, }, { x: 4, y: 5, }
+        ]);
+        done();
+      }, done.fail);
+    });
+  });
 });