src/display/node_utils.js - master - githubmirror/pdf.js

src/display/node_utils.js
106 строк3 KB
Jonas Jenwald
Remove the unused `ImageData` branch in the `putBinaryImageData` function
18 июн 2026, 19:22
18 июн 2026, 19:22b4b0a3f
/* Copyright 2020 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/* globals process */

import { isNodeJS, warn } from "../shared/util.js";
import { BaseBinaryDataFactory } from "./binary_data_factory.js";
import { BaseCanvasFactory } from "./canvas_factory.js";
import { BaseFilterFactory } from "./filter_factory.js";

if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
  throw new Error(
    'Module "./node_utils.js" shall not be used with MOZCENTRAL builds.'
  );
}

if (isNodeJS) {
  if (typeof PDFJSDev === "undefined" || PDFJSDev.test("SKIP_BABEL")) {
    warn("Please use the `legacy` build in Node.js environments.");
  } else {
    let canvas;
    try {
      const require = process
        .getBuiltinModule("module")
        .createRequire(import.meta.url);

      try {
        canvas = require("@napi-rs/canvas");
      } catch (ex) {
        warn(`Cannot load "@napi-rs/canvas" package: "${ex}".`);
      }
    } catch (ex) {
      warn(`Cannot access the \`require\` function: "${ex}".`);
    }

    if (!globalThis.DOMMatrix) {
      if (canvas?.DOMMatrix) {
        globalThis.DOMMatrix = canvas.DOMMatrix;
      } else {
        warn("Cannot polyfill `DOMMatrix`, rendering may be broken.");
      }
    }
    if (!globalThis.Path2D) {
      if (canvas?.Path2D) {
        globalThis.Path2D = canvas.Path2D;
      } else {
        warn("Cannot polyfill `Path2D`, rendering may be broken.");
      }
    }
    if (!globalThis.navigator?.language) {
      globalThis.navigator = {
        language: "en-US",
        platform: "",
        userAgent: "",
      };
    }
  }
}

async function fetchData(url) {
  const fs = process.getBuiltinModule("fs/promises");
  const data = await fs.readFile(url);
  return new Uint8Array(data);
}

class NodeFilterFactory extends BaseFilterFactory {}

class NodeCanvasFactory extends BaseCanvasFactory {
  /**
   * @ignore
   */
  _createCanvas(width, height) {
    const require = process
      .getBuiltinModule("module")
      .createRequire(import.meta.url);
    const canvas = require("@napi-rs/canvas");
    return canvas.createCanvas(width, height);
  }
}

class NodeBinaryDataFactory extends BaseBinaryDataFactory {
  /**
   * @ignore
   */
  async _fetch(url, kind) {
    return fetchData(url);
  }
}

export {
  fetchData,
  NodeBinaryDataFactory,
  NodeCanvasFactory,
  NodeFilterFactory,
};