mirror of
https://github.com/mozilla/pdf.js.git
synced 2026-06-23 08:25:48 +02:00
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.
121 lines
3.4 KiB
JavaScript
121 lines
3.4 KiB
JavaScript
/* Copyright 2024 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 OpenJPEG from "../../external/openjpeg/openjpeg.js";
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import { Stream } from "./stream.js";
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import { WasmImage } from "./wasm_image.js";
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class JpxError extends BaseException {
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constructor(msg) {
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super(msg, "JpxError");
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}
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}
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class JpxImage extends WasmImage {
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_filename = "openjpeg.wasm";
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_noWasmFilename = "openjpeg_nowasm_fallback.js";
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static get instance() {
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return shadow(this, "instance", new JpxImage(/* trackInstance = */ true));
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}
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async decode(
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bytes,
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{
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numComponents = 4,
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isIndexedColormap = false,
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smaskInData = false,
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reducePower = 0,
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} = {}
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) {
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const module = await this._getModule(OpenJPEG);
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if (!module) {
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throw new JpxError("OpenJPEG failed to initialize");
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}
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let ptr;
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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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const ret = module._jp2_decode(
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ptr,
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size,
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numComponents > 0 ? numComponents : 0,
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!!isIndexedColormap,
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!!smaskInData,
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reducePower
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);
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if (ret) {
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const { errorMessages } = module;
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if (errorMessages) {
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delete module.errorMessages;
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throw new JpxError(errorMessages);
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}
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throw new JpxError("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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}
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}
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static parseImageProperties(stream) {
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if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("IMAGE_DECODERS")) {
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if (stream instanceof ArrayBuffer || ArrayBuffer.isView(stream)) {
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stream = new Stream(stream);
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} else {
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throw new JpxError("Invalid data format, must be a TypedArray.");
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}
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}
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// No need to use OpenJPEG here since we're only getting very basic
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// information which are located in the first bytes of the file.
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let newByte = stream.getByte();
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while (newByte >= 0) {
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const oldByte = newByte;
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newByte = stream.getByte();
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const code = (oldByte << 8) | newByte;
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// Image and tile size (SIZ)
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if (code === 0xff51) {
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stream.skip(4);
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const Xsiz = stream.getInt32() >>> 0; // Byte 4
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const Ysiz = stream.getInt32() >>> 0; // Byte 8
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const XOsiz = stream.getInt32() >>> 0; // Byte 12
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const YOsiz = stream.getInt32() >>> 0; // Byte 16
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stream.skip(16);
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const Csiz = stream.getUint16(); // Byte 36
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return {
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width: Xsiz - XOsiz,
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height: Ysiz - YOsiz,
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// Results are always returned as `Uint8ClampedArray`s.
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bitsPerComponent: 8,
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componentsCount: Csiz,
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};
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}
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}
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throw new JpxError("No size marker found in JPX stream");
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}
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}
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export { JpxError, JpxImage };
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