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[api-minor] Pass CanvasFactory/FilterFactory, rather than instances, to getDocument

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This unifies the various factory-options, since it's consistent with `CMapReaderFactory`/`StandardFontDataFactory`, and ensures that any needed parameters will always be consistently provided when creating `CanvasFactory`/`FilterFactory`-instances.

As shown in the modified example this may simplify some custom implementations, since we now provide the ability to access the `CanvasFactory`-instance used with a particular `getDocument`-invocation.
This commit is contained in:
Jonas Jenwald 2024-09-23 10:22:39 +02:00
parent ddd7b63406
commit bb302dd993
7 changed files with 37 additions and 51 deletions
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36
examples/node/pdf2png/pdf2png.mjs
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@ -13,41 +13,9 @@
* limitations under the License.
*/
import { strict as assert } from "assert";
import Canvas from "canvas";
import fs from "fs";
import { getDocument } from "pdfjs-dist/legacy/build/pdf.mjs";
class NodeCanvasFactory {
create(width, height) {
assert(width > 0 && height > 0, "Invalid canvas size");
const canvas = Canvas.createCanvas(width, height);
const context = canvas.getContext("2d");
return {
canvas,
context,
};
}
reset(canvasAndContext, width, height) {
assert(canvasAndContext.canvas, "Canvas is not specified");
assert(width > 0 && height > 0, "Invalid canvas size");
canvasAndContext.canvas.width = width;
canvasAndContext.canvas.height = height;
}
destroy(canvasAndContext) {
assert(canvasAndContext.canvas, "Canvas is not specified");
// Zeroing the width and height cause Firefox to release graphics
// resources immediately, which can greatly reduce memory consumption.
canvasAndContext.canvas.width = 0;
canvasAndContext.canvas.height = 0;
canvasAndContext.canvas = null;
canvasAndContext.context = null;
}
}
// Some PDFs need external cmaps.
const CMAP_URL = "../../../node_modules/pdfjs-dist/cmaps/";
const CMAP_PACKED = true;
@ -56,8 +24,6 @@ const CMAP_PACKED = true;
const STANDARD_FONT_DATA_URL =
"../../../node_modules/pdfjs-dist/standard_fonts/";
const canvasFactory = new NodeCanvasFactory();
// Loading file from file system into typed array.
const pdfPath =
process.argv[2] || "../../../web/compressed.tracemonkey-pldi-09.pdf";
@ -69,7 +35,6 @@ const loadingTask = getDocument({
cMapUrl: CMAP_URL,
cMapPacked: CMAP_PACKED,
standardFontDataUrl: STANDARD_FONT_DATA_URL,
canvasFactory,
});
try {
@ -78,6 +43,7 @@ try {
// Get the first page.
const page = await pdfDocument.getPage(1);
// Render the page on a Node canvas with 100% scale.
const canvasFactory = pdfDocument.canvasFactory;
const viewport = page.getViewport({ scale: 1.0 });
const canvasAndContext = canvasFactory.create(
viewport.width,