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Merge pull request #21021 from Snuffleupagus/PDFThumbnailView-unconditional-OffscreenCanvas

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Use `OffscreenCanvas` unconditionally in the `web/pdf_thumbnail_view.js` file
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Tim van der Meij 2026-04-03 17:57:04 +02:00 committed by GitHub
commit cc5e30b99c
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1 changed files with 12 additions and 30 deletions
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42
web/pdf_thumbnail_view.js
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@ -21,11 +21,7 @@
// eslint-disable-next-line max-len
/** @typedef {import("./pdf_rendering_queue").PDFRenderingQueue} PDFRenderingQueue */
import {
FeatureTest,
OutputScale,
RenderingCancelledException,
} from "pdfjs-lib";
import { OutputScale, RenderingCancelledException } from "pdfjs-lib";
import { RenderableView, RenderingStates } from "./renderable_view.js";
import { AppOptions } from "./app_options.js";
@ -55,26 +51,16 @@ const THUMBNAIL_WIDTH = 126; // px
* mode.
*/
class TempImageFactory {
static getCanvas(width, height) {
let tempCanvas;
if (FeatureTest.isOffscreenCanvasSupported) {
tempCanvas = new OffscreenCanvas(width, height);
} else {
tempCanvas = document.createElement("canvas");
tempCanvas.width = width;
tempCanvas.height = height;
}
// Since this is a temporary canvas, we need to fill it with a white
// background ourselves. `#getPageDrawContext` uses CSS rules for this.
const ctx = tempCanvas.getContext("2d", { alpha: false });
ctx.save();
ctx.fillStyle = "rgb(255, 255, 255)";
ctx.fillRect(0, 0, width, height);
ctx.restore();
return [tempCanvas, ctx];
}
function getTempCanvas(width, height) {
const canvas = new OffscreenCanvas(width, height);
// Since this is a temporary canvas, we need to fill it with a white
// background ourselves. `#getPageDrawContext` uses CSS rules for this.
const ctx = canvas.getContext("2d", { alpha: false });
ctx.save();
ctx.fillStyle = "rgb(255, 255, 255)";
ctx.fillRect(0, 0, width, height);
ctx.restore();
return [canvas, ctx];
}
class PDFThumbnailView extends RenderableView {
@ -364,10 +350,6 @@ class PDFThumbnailView extends RenderableView {
image.setAttribute("data-l10n-id", "pdfjs-thumb-page-canvas");
image.setAttribute("data-l10n-args", this.#getPageL10nArgs());
imageContainer.classList.remove("missingThumbnailImage");
if (!FeatureTest.isOffscreenCanvasSupported) {
// Clean up the canvas element since it is no longer needed.
reducedCanvas.width = reducedCanvas.height = 0;
}
}
async draw() {
@ -506,7 +488,7 @@ class PDFThumbnailView extends RenderableView {
}
// drawImage does an awful job of rescaling the image, doing it gradually.
let [reducedWidth, reducedHeight] = this.#getReducedImageDims(canvas);
const [reducedImage, reducedImageCtx] = TempImageFactory.getCanvas(
const [reducedImage, reducedImageCtx] = getTempCanvas(
reducedWidth,
reducedHeight
);