pdf.js.mirror/src/pdf.image_decoders.js
Jonas Jenwald a6988582d2 [api-minor] Replace the CCITT and JBig2 fallback decoders with a JS version of the PDFium decoder
*Note:* This is similar to PR 19525, which did the same thing for the OpenJPEG decoder.

The advantages of doing this are:
 - The same JBig2 decoder is used regardless of WASM being supported or not, which means consistent rendering.
 - The old `Jbig2Image` implementation has various bugs and missing features.
 - Less code that needs to be maintained in the PDF.js project, since both the CCITT and the JBig2 decoder is replaced.

The disadvantage of doing this is:
 - Slightly larger bundle size, however the effect is limited since a fair amount of PDF.js code can be removed. For the `gulp mozcentral` target the size increase is approximately 54 kilo-bytes (which is small compared to the 452 kilo-bytes for the JS version of the OpenJPEG decoder).
2026-04-22 23:24:26 +02:00

51 lines
1.2 KiB
JavaScript

/* Copyright 2018 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.
*/
import {
getVerbosityLevel,
setVerbosityLevel,
VerbosityLevel,
} from "./shared/util.js";
import {
Jbig2Error,
JBig2CCITTFaxImage as Jbig2Image,
} from "./core/jbig2_ccittFax.js";
import { JpegError, JpegImage } from "./core/jpg.js";
import { JpxError, JpxImage } from "./core/jpx.js";
globalThis.pdfjsImageDecoders = {
getVerbosityLevel,
Jbig2Error,
Jbig2Image,
JpegError,
JpegImage,
JpxError,
JpxImage,
setVerbosityLevel,
VerbosityLevel,
};
export {
getVerbosityLevel,
Jbig2Error,
Jbig2Image,
JpegError,
JpegImage,
JpxError,
JpxImage,
setVerbosityLevel,
VerbosityLevel,
};