[Editor] Add support for printing/saving newly added Stamp annotations

In order to minimize the size the of a saved pdf, we generate only one
image and use a reference in each annotation using it.
When printing, it's slightly different since we have to render each page
independantly but we use the same image within a page.

src/core/annotation.js

@@ -23,6 +23,7 @@ import {
   AnnotationType,
   assert,
   BASELINE_FACTOR,
+  FeatureTest,
   getModificationDate,
   IDENTITY_MATRIX,
   LINE_DESCENT_FACTOR,
@@ -52,15 +53,16 @@ import {
   parseDefaultAppearance,
 } from "./default_appearance.js";
 import { Dict, isName, Name, Ref, RefSet } from "./primitives.js";
+import { Stream, StringStream } from "./stream.js";
 import { writeDict, writeObject } from "./writer.js";
 import { BaseStream } from "./base_stream.js";
 import { bidi } from "./bidi.js";
 import { Catalog } from "./catalog.js";
 import { ColorSpace } from "./colorspace.js";
 import { FileSpec } from "./file_spec.js";
+import { JpegStream } from "./jpeg_stream.js";
 import { ObjectLoader } from "./object_loader.js";
 import { OperatorList } from "./operator_list.js";
-import { StringStream } from "./stream.js";
 import { XFAFactory } from "./xfa/factory.js";
 
 class AnnotationFactory {
@@ -257,11 +259,31 @@ class AnnotationFactory {
     }
   }
 
-  static async saveNewAnnotations(evaluator, task, annotations) {
+  static generateImages(annotations, xref, isOffscreenCanvasSupported) {
+    if (!isOffscreenCanvasSupported) {
+      warn(
+        "generateImages: OffscreenCanvas is not supported, cannot save or print some annotations with images."
+      );
+      return null;
+    }
+    let imagePromises;
+    for (const { bitmapId, bitmap } of annotations) {
+      if (!bitmap) {
+        continue;
+      }
+      imagePromises ||= new Map();
+      imagePromises.set(bitmapId, StampAnnotation.createImage(bitmap, xref));
+    }
+
+    return imagePromises;
+  }
+
+  static async saveNewAnnotations(evaluator, task, annotations, imagePromises) {
     const xref = evaluator.xref;
     let baseFontRef;
     const dependencies = [];
     const promises = [];
+    const { isOffscreenCanvasSupported } = evaluator.options;
 
     for (const annotation of annotations) {
       if (annotation.deleted) {
@@ -293,6 +315,36 @@ class AnnotationFactory {
           promises.push(
             InkAnnotation.createNewAnnotation(xref, annotation, dependencies)
           );
+          break;
+        case AnnotationEditorType.STAMP:
+          if (!isOffscreenCanvasSupported) {
+            break;
+          }
+          const image = await imagePromises.get(annotation.bitmapId);
+          if (image.imageStream) {
+            const { imageStream, smaskStream } = image;
+            const buffer = [];
+            if (smaskStream) {
+              const smaskRef = xref.getNewTemporaryRef();
+              await writeObject(smaskRef, smaskStream, buffer, null);
+              dependencies.push({ ref: smaskRef, data: buffer.join("") });
+              imageStream.dict.set("SMask", smaskRef);
+              buffer.length = 0;
+            }
+            const imageRef = (image.imageRef = xref.getNewTemporaryRef());
+            await writeObject(imageRef, imageStream, buffer, null);
+            dependencies.push({ ref: imageRef, data: buffer.join("") });
+            image.imageStream = image.smaskStream = null;
+          }
+          promises.push(
+            StampAnnotation.createNewAnnotation(
+              xref,
+              annotation,
+              dependencies,
+              image
+            )
+          );
+          break;
       }
     }
 
@@ -302,7 +354,12 @@ class AnnotationFactory {
     };
   }
 
-  static async printNewAnnotations(evaluator, task, annotations) {
+  static async printNewAnnotations(
+    evaluator,
+    task,
+    annotations,
+    imagePromises
+  ) {
     if (!annotations) {
       return null;
     }
@@ -331,6 +388,23 @@ class AnnotationFactory {
             })
           );
           break;
+        case AnnotationEditorType.STAMP:
+          if (!isOffscreenCanvasSupported) {
+            break;
+          }
+          const image = await imagePromises.get(annotation.bitmapId);
+          if (image.imageStream) {
+            const { imageStream, smaskStream } = image;
+            if (smaskStream) {
+              imageStream.dict.set("SMask", smaskStream);
+            }
+            image.imageRef = new JpegStream(imageStream, imageStream.length);
+            image.imageStream = image.smaskStream = null;
+          }
+          promises.push(
+            StampAnnotation.createNewPrintAnnotation(xref, annotation, image)
+          );
+          break;
       }
     }
 
@@ -4361,6 +4435,143 @@ class StampAnnotation extends MarkupAnnotation {
     this.data.annotationType = AnnotationType.STAMP;
     this.data.hasOwnCanvas = this.data.noRotate;
   }
+
+  static async createImage(bitmap, xref) {
+    // TODO: when printing, we could have a specific internal colorspace
+    // (e.g. something like DeviceRGBA) in order avoid any conversion (i.e. no
+    // jpeg, no rgba to rgb conversion, etc...)
+
+    const { width, height } = bitmap;
+    const canvas = new OffscreenCanvas(width, height);
+    const ctx = canvas.getContext("2d", { alpha: true });
+
+    // Draw the image and get the data in order to extract the transparency.
+    ctx.drawImage(bitmap, 0, 0);
+    const data = ctx.getImageData(0, 0, width, height).data;
+    const buf32 = new Uint32Array(data.buffer);
+    const hasAlpha = buf32.some(
+      FeatureTest.isLittleEndian
+        ? x => x >>> 24 !== 0xff
+        : x => (x & 0xff) !== 0xff
+    );
+
+    if (hasAlpha) {
+      // Redraw the image on a white background in order to remove the thin gray
+      // line which can appear when exporting to jpeg.
+      ctx.fillStyle = "white";
+      ctx.fillRect(0, 0, width, height);
+      ctx.drawImage(bitmap, 0, 0);
+    }
+
+    const jpegBufferPromise = canvas
+      .convertToBlob({ type: "image/jpeg", quality: 1 })
+      .then(blob => {
+        return blob.arrayBuffer();
+      });
+
+    const xobjectName = Name.get("XObject");
+    const imageName = Name.get("Image");
+    const image = new Dict(xref);
+    image.set("Type", xobjectName);
+    image.set("Subtype", imageName);
+    image.set("BitsPerComponent", 8);
+    image.set("ColorSpace", Name.get("DeviceRGB"));
+    image.set("Filter", Name.get("DCTDecode"));
+    image.set("BBox", [0, 0, width, height]);
+    image.set("Width", width);
+    image.set("Height", height);
+
+    let smaskStream = null;
+    if (hasAlpha) {
+      const alphaBuffer = new Uint8Array(buf32.length);
+      if (FeatureTest.isLittleEndian) {
+        for (let i = 0, ii = buf32.length; i < ii; i++) {
+          alphaBuffer[i] = buf32[i] >>> 24;
+        }
+      } else {
+        for (let i = 0, ii = buf32.length; i < ii; i++) {
+          alphaBuffer[i] = buf32[i] & 0xff;
+        }
+      }
+
+      const smask = new Dict(xref);
+      smask.set("Type", xobjectName);
+      smask.set("Subtype", imageName);
+      smask.set("BitsPerComponent", 8);
+      smask.set("ColorSpace", Name.get("DeviceGray"));
+      smask.set("Width", width);
+      smask.set("Height", height);
+
+      smaskStream = new Stream(alphaBuffer, 0, 0, smask);
+    }
+    const imageStream = new Stream(await jpegBufferPromise, 0, 0, image);
+
+    return {
+      imageStream,
+      smaskStream,
+      width,
+      height,
+    };
+  }
+
+  static createNewDict(annotation, xref, { apRef, ap }) {
+    const { rect, rotation, user } = annotation;
+    const stamp = new Dict(xref);
+    stamp.set("Type", Name.get("Annot"));
+    stamp.set("Subtype", Name.get("Stamp"));
+    stamp.set("CreationDate", `D:${getModificationDate()}`);
+    stamp.set("Rect", rect);
+    stamp.set("F", 4);
+    stamp.set("Border", [0, 0, 0]);
+    stamp.set("Rotate", rotation);
+
+    if (user) {
+      stamp.set(
+        "T",
+        isAscii(user) ? user : stringToUTF16String(user, /* bigEndian = */ true)
+      );
+    }
+
+    if (apRef || ap) {
+      const n = new Dict(xref);
+      stamp.set("AP", n);
+
+      if (apRef) {
+        n.set("N", apRef);
+      } else {
+        n.set("N", ap);
+      }
+    }
+
+    return stamp;
+  }
+
+  static async createNewAppearanceStream(annotation, xref, params) {
+    const { rotation } = annotation;
+    const { imageRef, width, height } = params;
+    const resources = new Dict(xref);
+    const xobject = new Dict(xref);
+    resources.set("XObject", xobject);
+    xobject.set("Im0", imageRef);
+    const appearance = `q ${width} 0 0 ${height} 0 0 cm /Im0 Do Q`;
+
+    const appearanceStreamDict = new Dict(xref);
+    appearanceStreamDict.set("FormType", 1);
+    appearanceStreamDict.set("Subtype", Name.get("Form"));
+    appearanceStreamDict.set("Type", Name.get("XObject"));
+    appearanceStreamDict.set("BBox", [0, 0, width, height]);
+    appearanceStreamDict.set("Resources", resources);
+
+    if (rotation) {
+      const matrix = getRotationMatrix(rotation, width, height);
+      appearanceStreamDict.set("Matrix", matrix);
+    }
+
+    const ap = new StringStream(appearance);
+    ap.dict = appearanceStreamDict;
+
+    return ap;
+  }
 }
 
 class FileAttachmentAnnotation extends MarkupAnnotation {

src/core/document.js

@@ -13,8 +13,8 @@
  * limitations under the License.
  */
 
-import { AnnotationFactory, PopupAnnotation } from "./annotation.js";
 import {
+  AnnotationEditorPrefix,
   assert,
   FormatError,
   info,
@@ -30,6 +30,7 @@ import {
   Util,
   warn,
 } from "../shared/util.js";
+import { AnnotationFactory, PopupAnnotation } from "./annotation.js";
 import {
   collectActions,
   getInheritableProperty,
@@ -277,7 +278,7 @@ class Page {
     }
   }
 
-  async saveNewAnnotations(handler, task, annotations) {
+  async saveNewAnnotations(handler, task, annotations, imagePromises) {
     if (this.xfaFactory) {
       throw new Error("XFA: Cannot save new annotations.");
     }
@@ -306,7 +307,8 @@ class Page {
     const newData = await AnnotationFactory.saveNewAnnotations(
       partialEvaluator,
       task,
-      annotations
+      annotations,
+      imagePromises
     );
 
     for (const { ref } of newData.annotations) {
@@ -433,14 +435,52 @@ class Page {
 
     let newAnnotationsPromise = Promise.resolve(null);
     if (newAnnotationsByPage) {
+      let imagePromises;
       const newAnnotations = newAnnotationsByPage.get(this.pageIndex);
       if (newAnnotations) {
+        // An annotation can contain a reference to a bitmap, but this bitmap
+        // is defined in another annotation. So we need to find this annotation
+        // and generate the bitmap.
+        const missingBitmaps = new Set();
+        for (const { bitmapId, bitmap } of newAnnotations) {
+          if (bitmapId && !bitmap && !missingBitmaps.has(bitmapId)) {
+            missingBitmaps.add(bitmapId);
+          }
+        }
+
+        const { isOffscreenCanvasSupported } = this.evaluatorOptions;
+        if (missingBitmaps.size > 0) {
+          const annotationWithBitmaps = [];
+          for (const [key, annotation] of annotationStorage) {
+            if (!key.startsWith(AnnotationEditorPrefix)) {
+              continue;
+            }
+            if (annotation.bitmap && missingBitmaps.has(annotation.bitmapId)) {
+              annotationWithBitmaps.push(annotation);
+            }
+          }
+          // The array annotationWithBitmaps cannot be empty: the check above
+          // makes sure to have at least one annotation containing the bitmap.
+          imagePromises = AnnotationFactory.generateImages(
+            annotationWithBitmaps,
+            this.xref,
+            isOffscreenCanvasSupported
+          );
+        } else {
+          imagePromises = AnnotationFactory.generateImages(
+            newAnnotations,
+            this.xref,
+            isOffscreenCanvasSupported
+          );
+        }
+
         deletedAnnotations = new RefSet();
         this.#replaceIdByRef(newAnnotations, deletedAnnotations, null);
         newAnnotationsPromise = AnnotationFactory.printNewAnnotations(
           partialEvaluator,
           task,
-          newAnnotations
+          newAnnotations,
+          imagePromises
         );
       }
     }

src/core/worker.js

@@ -36,6 +36,7 @@ import {
 } from "./core_utils.js";
 import { Dict, Ref } from "./primitives.js";
 import { LocalPdfManager, NetworkPdfManager } from "./pdf_manager.js";
+import { AnnotationFactory } from "./annotation.js";
 import { clearGlobalCaches } from "./cleanup_helper.js";
 import { incrementalUpdate } from "./writer.js";
 import { isNodeJS } from "../shared/is_node.js";
@@ -537,12 +538,11 @@ class WorkerMessageHandler {
 
     handler.on(
       "SaveDocument",
-      function ({ isPureXfa, numPages, annotationStorage, filename }) {
+      async function ({ isPureXfa, numPages, annotationStorage, filename }) {
         const promises = [
           pdfManager.requestLoadedStream(),
           pdfManager.ensureCatalog("acroForm"),
           pdfManager.ensureCatalog("acroFormRef"),
-          pdfManager.ensureDoc("xref"),
           pdfManager.ensureDoc("startXRef"),
         ];
 
@@ -550,13 +550,21 @@ class WorkerMessageHandler {
           ? getNewAnnotationsMap(annotationStorage)
           : null;
 
+        const xref = await pdfManager.ensureDoc("xref");
+
         if (newAnnotationsByPage) {
+          const imagePromises = AnnotationFactory.generateImages(
+            annotationStorage.values(),
+            xref,
+            pdfManager.evaluatorOptions.isOffscreenCanvasSupported
+          );
+
           for (const [pageIndex, annotations] of newAnnotationsByPage) {
             promises.push(
               pdfManager.getPage(pageIndex).then(page => {
                 const task = new WorkerTask(`Save (editor): page ${pageIndex}`);
                 return page
-                  .saveNewAnnotations(handler, task, annotations)
+                  .saveNewAnnotations(handler, task, annotations, imagePromises)
                   .finally(function () {
                     finishWorkerTask(task);
                   });
@@ -586,7 +594,6 @@ class WorkerMessageHandler {
           stream,
           acroForm,
           acroFormRef,
-          xref,
           startXRef,
           ...refs
         ]) {

src/display/api.js

@@ -1812,6 +1812,15 @@ class PDFPageProxy {
       );
     }
 
+    const transfers = [];
+    if (annotationStorageMap) {
+      for (const annotation of annotationStorageMap.values()) {
+        if (annotation.bitmap) {
+          transfers.push(annotation.bitmap);
+        }
+      }
+    }
+
     const readableStream = this._transport.messageHandler.sendWithStream(
       "GetOperatorList",
       {
@@ -1819,7 +1828,8 @@ class PDFPageProxy {
         intent: renderingIntent,
         cacheKey,
         annotationStorage: annotationStorageMap,
-      }
+      },
+      transfers
     );
     const reader = readableStream.getReader();
 
@@ -2898,13 +2908,26 @@ class WorkerTransport {
           "please use the getData-method instead."
       );
     }
+    const annotationStorage = this.annotationStorage.serializable;
+    const transfers = [];
+    if (annotationStorage) {
+      for (const annotation of annotationStorage.values()) {
+        if (annotation.bitmap) {
+          transfers.push(annotation.bitmap);
+        }
+      }
+    }
     return this.messageHandler
-      .sendWithPromise("SaveDocument", {
-        isPureXfa: !!this._htmlForXfa,
-        numPages: this._numPages,
-        annotationStorage: this.annotationStorage.serializable,
-        filename: this._fullReader?.filename ?? null,
-      })
+      .sendWithPromise(
+        "SaveDocument",
+        {
+          isPureXfa: !!this._htmlForXfa,
+          numPages: this._numPages,
+          annotationStorage,
+          filename: this._fullReader?.filename ?? null,
+        },
+        transfers
+      )
       .finally(() => {
         this.annotationStorage.resetModified();
       });

src/shared/util.js

@@ -70,6 +70,7 @@ const AnnotationEditorType = {
   DISABLE: -1,
   NONE: 0,
   FREETEXT: 3,
+  STAMP: 13,
   INK: 15,
 };
 

test/driver.js

@@ -490,8 +490,24 @@ class Driver {
         });
         let promise = loadingTask.promise;
 
+        if (task.annotationStorage) {
+          for (const annotation of Object.values(task.annotationStorage)) {
+            if (annotation.bitmapName) {
+              promise = promise.then(async doc => {
+                const response = await fetch(
+                  new URL(`./images/${annotation.bitmapName}`, window.location)
+                );
+                const blob = await response.blob();
+                annotation.bitmap = await createImageBitmap(blob);
+
+                return doc;
+              });
+            }
+          }
+        }
+
         if (task.save) {
-          promise = loadingTask.promise.then(async doc => {
+          promise = promise.then(async doc => {
             if (!task.annotationStorage) {
               throw new Error("Missing `annotationStorage` entry.");
             }

test/test_manifest.json

@@ -7814,5 +7814,155 @@
       "rounds": 1,
       "type": "eq",
       "annotations": true
+   },
+   {
+      "id": "tracemonkey-stamp-editor-print",
+      "file": "pdfs/tracemonkey.pdf",
+      "md5": "9a192d8b1a7dc652a19835f6f08098bd",
+      "rounds": 1,
+      "lastPage": 1,
+      "type": "eq",
+      "print": true,
+      "annotationStorage": {
+        "pdfjs_internal_editor_0": {
+          "annotationType": 13,
+          "pageIndex": 0,
+          "bitmapName": "firefox_logo.png",
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "rect": [37.5, 32.406246185302734, 496.5000057220459, 519.1875],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_1": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 0,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+       }
+     }
+   },
+   {
+      "id": "tracemonkey-stamp-editor-save-print",
+      "file": "pdfs/tracemonkey.pdf",
+      "md5": "9a192d8b1a7dc652a19835f6f08098bd",
+      "rounds": 1,
+      "lastPage": 1,
+      "type": "eq",
+      "save": true,
+      "print": true,
+      "annotationStorage": {
+        "pdfjs_internal_editor_0": {
+          "annotationType": 13,
+          "pageIndex": 0,
+          "bitmapName": "firefox_logo.png",
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "rect": [37.5, 32.406246185302734, 496.5000057220459, 519.1875],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_1": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 0,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+       }
+     }
+   },
+   {
+      "id": "tracemonkey-stamp-editor-print-2-pages",
+      "file": "pdfs/tracemonkey.pdf",
+      "md5": "9a192d8b1a7dc652a19835f6f08098bd",
+      "rounds": 1,
+      "lastPage": 2,
+      "type": "eq",
+      "print": true,
+      "annotationStorage": {
+        "pdfjs_internal_editor_0": {
+          "annotationType": 13,
+          "pageIndex": 0,
+          "bitmapName": "firefox_logo.png",
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "rect": [37.5, 32.406246185302734, 496.5000057220459, 519.1875],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_1": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 0,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_2": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 1,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+        }
+      }
+   },
+   {
+      "id": "tracemonkey-stamp-editor-save-print-2-pages",
+      "file": "pdfs/tracemonkey.pdf",
+      "md5": "9a192d8b1a7dc652a19835f6f08098bd",
+      "rounds": 1,
+      "lastPage": 2,
+      "type": "eq",
+      "save": true,
+      "print": true,
+      "annotationStorage": {
+        "pdfjs_internal_editor_0": {
+          "annotationType": 13,
+          "pageIndex": 0,
+          "bitmapName": "firefox_logo.png",
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "rect": [37.5, 32.406246185302734, 496.5000057220459, 519.1875],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_1": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 0,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+        },
+        "pdfjs_internal_editor_2": {
+          "annotationType": 13,
+          "bitmapId": "image_c29eaeb9-8839-4a09-bf7c-75a5785805cd_0",
+          "pageIndex": 1,
+          "rect": [
+           458.06250572204584,
+           473.04686737060547,
+           571.5000057220459,
+           582.7187461853027
+          ],
+          "rotation": 0
+        }
+     }
    }
 ]

test/unit/api_spec.js

@@ -2134,6 +2134,58 @@ describe("api", function () {
       await loadingTask.destroy();
     });
 
+    it("write a new stamp annotation, save the pdf and check that the same image has the same ref", async function () {
+      if (isNodeJS) {
+        pending("Cannot create a bitmap from Node.js.");
+      }
+
+      const TEST_IMAGES_PATH = "../images/";
+      const filename = "firefox_logo.png";
+      const path = new URL(TEST_IMAGES_PATH + filename, window.location).href;
+
+      const response = await fetch(path);
+      const blob = await response.blob();
+      const bitmap = await createImageBitmap(blob);
+
+      let loadingTask = getDocument(buildGetDocumentParams("empty.pdf"));
+      let pdfDoc = await loadingTask.promise;
+      pdfDoc.annotationStorage.setValue("pdfjs_internal_editor_0", {
+        annotationType: AnnotationEditorType.STAMP,
+        rect: [12, 34, 56, 78],
+        rotation: 0,
+        bitmap,
+        bitmapId: "im1",
+        pageIndex: 0,
+      });
+      pdfDoc.annotationStorage.setValue("pdfjs_internal_editor_1", {
+        annotationType: AnnotationEditorType.STAMP,
+        rect: [112, 134, 156, 178],
+        rotation: 0,
+        bitmapId: "im1",
+        pageIndex: 0,
+      });
+
+      const data = await pdfDoc.saveDocument();
+      await loadingTask.destroy();
+
+      loadingTask = getDocument(data);
+      pdfDoc = await loadingTask.promise;
+      const page = await pdfDoc.getPage(1);
+      const opList = await page.getOperatorList();
+
+      // The pdf contains two stamp annotations with the same image.
+      // The image should be stored only once in the pdf and referenced twice.
+      // So we can verify that the image is referenced twice in the opList.
+
+      for (let i = 0; i < opList.fnArray.length; i++) {
+        if (opList.fnArray[i] === OPS.paintImageXObject) {
+          expect(opList.argsArray[i][0]).toEqual("img_p0_1");
+        }
+      }
+
+      await loadingTask.destroy();
+    });
+
     describe("Cross-origin", function () {
       let loadingTask;
       function _checkCanLoad(expectSuccess, filename, options) {