mirror of
https://github.com/mozilla/pdf.js.git
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3f6a2feef6
This fixes two things that I overlooked in PR 21225, more specifically: - Use proper, rather than semi, private class fields in `WasmImage`. - Make tracking of `WasmImage` instances optional, to avoid keeping data alive permanently in the `IMAGE_DECODERS` build.
92 lines
2.4 KiB
JavaScript
92 lines
2.4 KiB
JavaScript
/* Copyright 2026 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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import { BaseException, shadow } from "../shared/util.js";
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import JBig2 from "../../external/jbig2/jbig2.js";
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import { WasmImage } from "./wasm_image.js";
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class Jbig2Error extends BaseException {
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constructor(msg) {
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super(msg, "Jbig2Error");
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}
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}
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class JBig2CCITTFaxImage extends WasmImage {
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_filename = "jbig2.wasm";
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_noWasmFilename = "jbig2_nowasm_fallback.js";
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static get instance() {
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return shadow(
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this,
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"instance",
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new JBig2CCITTFaxImage(/* trackInstance = */ true)
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);
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}
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async decode(bytes, width, height, globals, CCITTOptions) {
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const module = await this._getModule(JBig2);
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if (!module) {
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throw new Jbig2Error("JBig2 failed to initialize");
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}
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let ptr, globalsPtr;
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try {
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const size = bytes.length;
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ptr = module._malloc(size);
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module.writeArrayToMemory(bytes, ptr);
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if (CCITTOptions) {
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module._ccitt_decode(
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ptr,
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size,
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width,
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height,
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CCITTOptions.K,
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CCITTOptions.EndOfLine ? 1 : 0,
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CCITTOptions.EncodedByteAlign ? 1 : 0,
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CCITTOptions.BlackIs1 ? 1 : 0,
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CCITTOptions.Columns,
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CCITTOptions.Rows
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);
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} else {
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const globalsSize = globals ? globals.length : 0;
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if (globalsSize > 0) {
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globalsPtr = module._malloc(globalsSize);
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module.writeArrayToMemory(globals, globalsPtr);
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}
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module._jbig2_decode(ptr, size, width, height, globalsPtr, globalsSize);
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}
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if (!module.imageData) {
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throw new Jbig2Error("Unknown error");
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}
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const { imageData } = module;
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module.imageData = null;
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return imageData;
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} finally {
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if (ptr) {
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module._free(ptr);
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}
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if (globalsPtr) {
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module._free(globalsPtr);
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}
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}
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}
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}
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export { JBig2CCITTFaxImage, Jbig2Error };
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