fbf6dee8ee
As it turns out, most of the code-paths in the `PDFImage`-class won't actually pass the TypedArray (containing the image-data) to the `ColorSpace`-code. Hence we *generally* don't need to force the image-data to be a `Uint8ClampedArray`, and can just as well directly use a `Uint8Array` instead. In the following cases we're returning the data without any `ColorSpace`-parsing, and the exact TypedArray used shouldn't matter: -b72a448327/src/core/image.js (L714)-b72a448327/src/core/image.js (L751)In the following cases the image-data is only used *internally*, and again the exact TypedArray used shouldn't matter: -b72a448327/src/core/image.js (L762)with the actual image-data being defined (as `Uint8ClampedArray`) further below -b72a448327/src/core/image.js (L837)*Please note:* This is tagged `api-minor` because it's API-observable, given that *some* image/mask-data will now be returned as `Uint8Array` rather than using `Uint8ClampedArray` unconditionally. However, that seems like a small price to pay to (slightly) reduce memory usage during image-conversion.
111 lines
2.4 KiB
JavaScript
111 lines
2.4 KiB
JavaScript
/* Copyright 2021 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 { bytesToString, shadow, unreachable } from "../shared/util.js";
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class BaseStream {
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constructor() {
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if (this.constructor === BaseStream) {
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unreachable("Cannot initialize BaseStream.");
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}
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}
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// eslint-disable-next-line getter-return
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get length() {
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unreachable("Abstract getter `length` accessed");
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}
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// eslint-disable-next-line getter-return
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get isEmpty() {
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unreachable("Abstract getter `isEmpty` accessed");
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}
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get isDataLoaded() {
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return shadow(this, "isDataLoaded", true);
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}
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getByte() {
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unreachable("Abstract method `getByte` called");
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}
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getBytes(length) {
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unreachable("Abstract method `getBytes` called");
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}
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peekByte() {
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const peekedByte = this.getByte();
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if (peekedByte !== -1) {
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this.pos--;
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}
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return peekedByte;
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}
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peekBytes(length) {
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const bytes = this.getBytes(length);
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this.pos -= bytes.length;
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return bytes;
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}
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getUint16() {
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const b0 = this.getByte();
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const b1 = this.getByte();
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if (b0 === -1 || b1 === -1) {
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return -1;
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}
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return (b0 << 8) + b1;
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}
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getInt32() {
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const b0 = this.getByte();
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const b1 = this.getByte();
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const b2 = this.getByte();
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const b3 = this.getByte();
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return (b0 << 24) + (b1 << 16) + (b2 << 8) + b3;
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}
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getByteRange(begin, end) {
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unreachable("Abstract method `getByteRange` called");
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}
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getString(length) {
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return bytesToString(this.getBytes(length));
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}
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skip(n) {
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this.pos += n || 1;
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}
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reset() {
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unreachable("Abstract method `reset` called");
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}
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moveStart() {
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unreachable("Abstract method `moveStart` called");
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}
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makeSubStream(start, length, dict = null) {
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unreachable("Abstract method `makeSubStream` called");
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}
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/**
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* @returns {Array | null}
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*/
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getBaseStreams() {
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return null;
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}
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}
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export { BaseStream };
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