fc055dbd80
This patch extends PR 16115 to work in all browsers, regardless of their `OffscreenCanvas` support, such that transfer functions will be applied to general rendering (and not just image data). In order to do this we introduce the `BaseFilterFactory` that is then extended in browsers/Node.js environments, similar to all the other factories used in the API, such that we always have the necessary factory available in `src/display/canvas.js`. These changes help simplify the existing `putBinaryImageData` function, and the new method can easily be stubbed-out in the Firefox PDF Viewer. *Please note:* This patch removes the old *partial* transfer function support, which only applied to image data, from Node.js environments since the `node-canvas` package currently doesn't support filters. However, this should hopefully be fine given that: - Transfer functions are not very commonly used in PDF documents. - Browsers in general, and Firefox in particular, are the *primary* development target for the PDF.js library. - The FAQ only lists Node.js as *mostly* supported, see https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#faq-support
81 lines
2.0 KiB
JavaScript
81 lines
2.0 KiB
JavaScript
/* Copyright 2020 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* globals __non_webpack_require__ */
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import {
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BaseCanvasFactory,
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BaseCMapReaderFactory,
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BaseFilterFactory,
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BaseStandardFontDataFactory,
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} from "./base_factory.js";
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("MOZCENTRAL")) {
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throw new Error(
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'Module "./node_utils.js" shall not be used with MOZCENTRAL builds.'
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);
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}
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const fetchData = function (url) {
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return new Promise((resolve, reject) => {
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const fs = __non_webpack_require__("fs");
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fs.readFile(url, (error, data) => {
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if (error || !data) {
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reject(new Error(error));
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return;
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}
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resolve(new Uint8Array(data));
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});
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});
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};
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class NodeFilterFactory extends BaseFilterFactory {}
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class NodeCanvasFactory extends BaseCanvasFactory {
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/**
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* @ignore
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*/
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_createCanvas(width, height) {
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const Canvas = __non_webpack_require__("canvas");
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return Canvas.createCanvas(width, height);
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}
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}
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class NodeCMapReaderFactory extends BaseCMapReaderFactory {
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/**
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* @ignore
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*/
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_fetchData(url, compressionType) {
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return fetchData(url).then(data => {
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return { cMapData: data, compressionType };
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});
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}
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}
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class NodeStandardFontDataFactory extends BaseStandardFontDataFactory {
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/**
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* @ignore
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*/
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_fetchData(url) {
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return fetchData(url);
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}
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}
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export {
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NodeCanvasFactory,
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NodeCMapReaderFactory,
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NodeFilterFactory,
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NodeStandardFontDataFactory,
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};
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