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6ff0f8690f
Given that these classes are, with the exception of their `decode` methods, virtually identical this helps reduce code duplication and simplifies maintenance. These changes reduce the size of the `gulp mozcentral` build-target by `1292` bytes, which obviously isn't a lot but still cannot hurt.
69 lines
1.8 KiB
JavaScript
69 lines
1.8 KiB
JavaScript
/* Copyright 2012 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 { DecodeStream } from "./decode_stream.js";
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import { JpxImage } from "./jpx.js";
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import { shadow } from "../shared/util.js";
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/**
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* For JPEG 2000's we use a library to decode these images and
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* the stream behaves like all the other DecodeStreams.
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*/
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class JpxStream extends DecodeStream {
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constructor(stream, maybeLength) {
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super(maybeLength);
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this.stream = stream;
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this.dict = stream.dict;
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this.maybeLength = maybeLength;
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}
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get bytes() {
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// If `this.maybeLength` is null, we'll get the entire stream.
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return shadow(this, "bytes", this.stream.getBytes(this.maybeLength));
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}
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ensureBuffer(requested) {
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// No-op, since `this.readBlock` will always parse the entire image and
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// directly insert all of its data into `this.buffer`.
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}
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get isAsyncDecoder() {
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return true;
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}
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async decodeImage(bytes, _length, decoderOptions) {
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if (this.eof) {
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return this.buffer;
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}
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bytes ||= this.bytes;
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this.buffer = await JpxImage.instance.decode(bytes, decoderOptions);
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this.bufferLength = this.buffer.length;
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this.eof = true;
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return this.buffer;
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}
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get canAsyncDecodeImageFromBuffer() {
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return this.stream.isAsync;
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}
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get isImageStream() {
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return true;
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}
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}
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export { JpxStream };
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