764 lines
19 KiB
JavaScript
764 lines
19 KiB
JavaScript
/**
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* @licstart The following is the entire license notice for the
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* JavaScript code in this page
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*
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* Copyright 2022 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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* @licend The above is the entire license notice for the
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* JavaScript code in this page
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*/
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.PDFImage = void 0;
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var _util = require("../shared/util.js");
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var _image_utils = require("../shared/image_utils.js");
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var _base_stream = require("./base_stream.js");
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var _colorspace = require("./colorspace.js");
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var _decode_stream = require("./decode_stream.js");
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var _jpeg_stream = require("./jpeg_stream.js");
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var _jpx = require("./jpx.js");
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var _primitives = require("./primitives.js");
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function decodeAndClamp(value, addend, coefficient, max) {
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value = addend + value * coefficient;
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if (value < 0) {
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value = 0;
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} else if (value > max) {
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value = max;
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}
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return value;
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}
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function resizeImageMask(src, bpc, w1, h1, w2, h2) {
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const length = w2 * h2;
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let dest;
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if (bpc <= 8) {
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dest = new Uint8Array(length);
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} else if (bpc <= 16) {
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dest = new Uint16Array(length);
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} else {
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dest = new Uint32Array(length);
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}
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const xRatio = w1 / w2;
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const yRatio = h1 / h2;
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let i,
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j,
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py,
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newIndex = 0,
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oldIndex;
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const xScaled = new Uint16Array(w2);
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const w1Scanline = w1;
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for (i = 0; i < w2; i++) {
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xScaled[i] = Math.floor(i * xRatio);
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}
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for (i = 0; i < h2; i++) {
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py = Math.floor(i * yRatio) * w1Scanline;
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for (j = 0; j < w2; j++) {
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oldIndex = py + xScaled[j];
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dest[newIndex++] = src[oldIndex];
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}
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}
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return dest;
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}
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class PDFImage {
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constructor({
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xref,
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res,
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image,
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isInline = false,
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smask = null,
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mask = null,
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isMask = false,
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pdfFunctionFactory,
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localColorSpaceCache
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}) {
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this.image = image;
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const dict = image.dict;
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const filter = dict.get("F", "Filter");
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let filterName;
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if (filter instanceof _primitives.Name) {
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filterName = filter.name;
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} else if (Array.isArray(filter)) {
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const filterZero = xref.fetchIfRef(filter[0]);
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if (filterZero instanceof _primitives.Name) {
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filterName = filterZero.name;
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}
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}
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switch (filterName) {
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case "JPXDecode":
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const jpxImage = new _jpx.JpxImage();
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jpxImage.parseImageProperties(image.stream);
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image.stream.reset();
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image.width = jpxImage.width;
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image.height = jpxImage.height;
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image.bitsPerComponent = jpxImage.bitsPerComponent;
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image.numComps = jpxImage.componentsCount;
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break;
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case "JBIG2Decode":
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image.bitsPerComponent = 1;
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image.numComps = 1;
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break;
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}
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let width = dict.get("W", "Width");
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let height = dict.get("H", "Height");
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if (Number.isInteger(image.width) && image.width > 0 && Number.isInteger(image.height) && image.height > 0 && (image.width !== width || image.height !== height)) {
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(0, _util.warn)("PDFImage - using the Width/Height of the image data, " + "rather than the image dictionary.");
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width = image.width;
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height = image.height;
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}
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if (width < 1 || height < 1) {
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throw new _util.FormatError(`Invalid image width: ${width} or height: ${height}`);
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}
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this.width = width;
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this.height = height;
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this.interpolate = dict.get("I", "Interpolate");
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this.imageMask = dict.get("IM", "ImageMask") || false;
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this.matte = dict.get("Matte") || false;
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let bitsPerComponent = image.bitsPerComponent;
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if (!bitsPerComponent) {
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bitsPerComponent = dict.get("BPC", "BitsPerComponent");
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if (!bitsPerComponent) {
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if (this.imageMask) {
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bitsPerComponent = 1;
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} else {
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throw new _util.FormatError(`Bits per component missing in image: ${this.imageMask}`);
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}
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}
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}
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this.bpc = bitsPerComponent;
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if (!this.imageMask) {
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let colorSpace = dict.getRaw("CS") || dict.getRaw("ColorSpace");
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if (!colorSpace) {
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(0, _util.info)("JPX images (which do not require color spaces)");
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switch (image.numComps) {
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case 1:
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colorSpace = _primitives.Name.get("DeviceGray");
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break;
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case 3:
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colorSpace = _primitives.Name.get("DeviceRGB");
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break;
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case 4:
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colorSpace = _primitives.Name.get("DeviceCMYK");
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break;
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default:
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throw new Error(`JPX images with ${image.numComps} color components not supported.`);
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}
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}
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this.colorSpace = _colorspace.ColorSpace.parse({
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cs: colorSpace,
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xref,
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resources: isInline ? res : null,
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pdfFunctionFactory,
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localColorSpaceCache
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});
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this.numComps = this.colorSpace.numComps;
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}
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this.decode = dict.getArray("D", "Decode");
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this.needsDecode = false;
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if (this.decode && (this.colorSpace && !this.colorSpace.isDefaultDecode(this.decode, bitsPerComponent) || isMask && !_colorspace.ColorSpace.isDefaultDecode(this.decode, 1))) {
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this.needsDecode = true;
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const max = (1 << bitsPerComponent) - 1;
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this.decodeCoefficients = [];
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this.decodeAddends = [];
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const isIndexed = this.colorSpace && this.colorSpace.name === "Indexed";
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for (let i = 0, j = 0; i < this.decode.length; i += 2, ++j) {
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const dmin = this.decode[i];
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const dmax = this.decode[i + 1];
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this.decodeCoefficients[j] = isIndexed ? (dmax - dmin) / max : dmax - dmin;
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this.decodeAddends[j] = isIndexed ? dmin : max * dmin;
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}
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}
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if (smask) {
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this.smask = new PDFImage({
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xref,
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res,
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image: smask,
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isInline,
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pdfFunctionFactory,
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localColorSpaceCache
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});
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} else if (mask) {
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if (mask instanceof _base_stream.BaseStream) {
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const maskDict = mask.dict,
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imageMask = maskDict.get("IM", "ImageMask");
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if (!imageMask) {
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(0, _util.warn)("Ignoring /Mask in image without /ImageMask.");
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} else {
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this.mask = new PDFImage({
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xref,
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res,
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image: mask,
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isInline,
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isMask: true,
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pdfFunctionFactory,
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localColorSpaceCache
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});
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}
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} else {
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this.mask = mask;
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}
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}
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}
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static async buildImage({
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xref,
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res,
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image,
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isInline = false,
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pdfFunctionFactory,
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localColorSpaceCache
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}) {
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const imageData = image;
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let smaskData = null;
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let maskData = null;
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const smask = image.dict.get("SMask");
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const mask = image.dict.get("Mask");
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if (smask) {
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if (smask instanceof _base_stream.BaseStream) {
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smaskData = smask;
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} else {
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(0, _util.warn)("Unsupported /SMask format.");
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}
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} else if (mask) {
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if (mask instanceof _base_stream.BaseStream || Array.isArray(mask)) {
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maskData = mask;
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} else {
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(0, _util.warn)("Unsupported /Mask format.");
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}
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}
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return new PDFImage({
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xref,
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res,
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image: imageData,
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isInline,
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smask: smaskData,
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mask: maskData,
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pdfFunctionFactory,
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localColorSpaceCache
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});
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}
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static createRawMask({
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imgArray,
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width,
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height,
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imageIsFromDecodeStream,
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inverseDecode,
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interpolate
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}) {
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const computedLength = (width + 7 >> 3) * height;
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const actualLength = imgArray.byteLength;
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const haveFullData = computedLength === actualLength;
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let data, i;
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if (imageIsFromDecodeStream && (!inverseDecode || haveFullData)) {
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data = imgArray;
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} else if (!inverseDecode) {
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data = new Uint8Array(imgArray);
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} else {
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data = new Uint8Array(computedLength);
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data.set(imgArray);
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data.fill(0xff, actualLength);
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}
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if (inverseDecode) {
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for (i = 0; i < actualLength; i++) {
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data[i] ^= 0xff;
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}
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}
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return {
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data,
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width,
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height,
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interpolate
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};
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}
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static createMask({
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imgArray,
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width,
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height,
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imageIsFromDecodeStream,
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inverseDecode,
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interpolate
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}) {
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const isSingleOpaquePixel = width === 1 && height === 1 && inverseDecode === (imgArray.length === 0 || !!(imgArray[0] & 128));
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if (isSingleOpaquePixel) {
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return {
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isSingleOpaquePixel
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};
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}
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if (_util.FeatureTest.isOffscreenCanvasSupported) {
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const canvas = new OffscreenCanvas(width, height);
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const ctx = canvas.getContext("2d");
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const imgData = ctx.createImageData(width, height);
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(0, _image_utils.applyMaskImageData)({
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src: imgArray,
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dest: imgData.data,
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width,
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height,
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inverseDecode
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});
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ctx.putImageData(imgData, 0, 0);
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const bitmap = canvas.transferToImageBitmap();
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return {
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data: null,
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width,
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height,
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interpolate,
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bitmap
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};
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}
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return this.createRawMask({
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imgArray,
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width,
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height,
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inverseDecode,
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imageIsFromDecodeStream,
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interpolate
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});
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}
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get drawWidth() {
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return Math.max(this.width, this.smask && this.smask.width || 0, this.mask && this.mask.width || 0);
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}
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get drawHeight() {
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return Math.max(this.height, this.smask && this.smask.height || 0, this.mask && this.mask.height || 0);
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}
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decodeBuffer(buffer) {
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const bpc = this.bpc;
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const numComps = this.numComps;
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const decodeAddends = this.decodeAddends;
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const decodeCoefficients = this.decodeCoefficients;
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const max = (1 << bpc) - 1;
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let i, ii;
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if (bpc === 1) {
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for (i = 0, ii = buffer.length; i < ii; i++) {
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buffer[i] = +!buffer[i];
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}
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return;
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}
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let index = 0;
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for (i = 0, ii = this.width * this.height; i < ii; i++) {
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for (let j = 0; j < numComps; j++) {
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buffer[index] = decodeAndClamp(buffer[index], decodeAddends[j], decodeCoefficients[j], max);
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index++;
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}
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}
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}
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getComponents(buffer) {
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const bpc = this.bpc;
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if (bpc === 8) {
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return buffer;
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}
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const width = this.width;
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const height = this.height;
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const numComps = this.numComps;
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const length = width * height * numComps;
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let bufferPos = 0;
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let output;
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if (bpc <= 8) {
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output = new Uint8Array(length);
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} else if (bpc <= 16) {
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output = new Uint16Array(length);
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} else {
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output = new Uint32Array(length);
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}
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const rowComps = width * numComps;
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const max = (1 << bpc) - 1;
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let i = 0,
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ii,
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buf;
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if (bpc === 1) {
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let mask, loop1End, loop2End;
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for (let j = 0; j < height; j++) {
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loop1End = i + (rowComps & ~7);
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loop2End = i + rowComps;
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while (i < loop1End) {
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buf = buffer[bufferPos++];
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output[i] = buf >> 7 & 1;
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output[i + 1] = buf >> 6 & 1;
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output[i + 2] = buf >> 5 & 1;
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output[i + 3] = buf >> 4 & 1;
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output[i + 4] = buf >> 3 & 1;
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output[i + 5] = buf >> 2 & 1;
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output[i + 6] = buf >> 1 & 1;
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output[i + 7] = buf & 1;
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i += 8;
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}
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if (i < loop2End) {
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buf = buffer[bufferPos++];
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mask = 128;
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while (i < loop2End) {
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output[i++] = +!!(buf & mask);
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mask >>= 1;
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}
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}
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}
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} else {
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let bits = 0;
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buf = 0;
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for (i = 0, ii = length; i < ii; ++i) {
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if (i % rowComps === 0) {
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buf = 0;
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bits = 0;
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}
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while (bits < bpc) {
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buf = buf << 8 | buffer[bufferPos++];
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bits += 8;
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}
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const remainingBits = bits - bpc;
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let value = buf >> remainingBits;
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if (value < 0) {
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value = 0;
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} else if (value > max) {
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value = max;
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}
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output[i] = value;
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buf &= (1 << remainingBits) - 1;
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bits = remainingBits;
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}
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}
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return output;
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}
|
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|
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fillOpacity(rgbaBuf, width, height, actualHeight, image) {
|
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const smask = this.smask;
|
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const mask = this.mask;
|
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let alphaBuf, sw, sh, i, ii, j;
|
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|
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if (smask) {
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sw = smask.width;
|
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sh = smask.height;
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alphaBuf = new Uint8ClampedArray(sw * sh);
|
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smask.fillGrayBuffer(alphaBuf);
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if (sw !== width || sh !== height) {
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alphaBuf = resizeImageMask(alphaBuf, smask.bpc, sw, sh, width, height);
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}
|
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} else if (mask) {
|
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if (mask instanceof PDFImage) {
|
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sw = mask.width;
|
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sh = mask.height;
|
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alphaBuf = new Uint8ClampedArray(sw * sh);
|
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mask.numComps = 1;
|
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mask.fillGrayBuffer(alphaBuf);
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for (i = 0, ii = sw * sh; i < ii; ++i) {
|
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alphaBuf[i] = 255 - alphaBuf[i];
|
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}
|
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if (sw !== width || sh !== height) {
|
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alphaBuf = resizeImageMask(alphaBuf, mask.bpc, sw, sh, width, height);
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}
|
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} else if (Array.isArray(mask)) {
|
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alphaBuf = new Uint8ClampedArray(width * height);
|
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const numComps = this.numComps;
|
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|
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for (i = 0, ii = width * height; i < ii; ++i) {
|
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let opacity = 0;
|
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const imageOffset = i * numComps;
|
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|
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for (j = 0; j < numComps; ++j) {
|
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const color = image[imageOffset + j];
|
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const maskOffset = j * 2;
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|
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if (color < mask[maskOffset] || color > mask[maskOffset + 1]) {
|
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opacity = 255;
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break;
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}
|
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}
|
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alphaBuf[i] = opacity;
|
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}
|
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} else {
|
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throw new _util.FormatError("Unknown mask format.");
|
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}
|
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}
|
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|
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if (alphaBuf) {
|
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for (i = 0, j = 3, ii = width * actualHeight; i < ii; ++i, j += 4) {
|
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rgbaBuf[j] = alphaBuf[i];
|
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}
|
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} else {
|
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for (i = 0, j = 3, ii = width * actualHeight; i < ii; ++i, j += 4) {
|
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rgbaBuf[j] = 255;
|
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}
|
|
}
|
|
}
|
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|
|
undoPreblend(buffer, width, height) {
|
|
const matte = this.smask && this.smask.matte;
|
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|
|
if (!matte) {
|
|
return;
|
|
}
|
|
|
|
const matteRgb = this.colorSpace.getRgb(matte, 0);
|
|
const matteR = matteRgb[0];
|
|
const matteG = matteRgb[1];
|
|
const matteB = matteRgb[2];
|
|
const length = width * height * 4;
|
|
|
|
for (let i = 0; i < length; i += 4) {
|
|
const alpha = buffer[i + 3];
|
|
|
|
if (alpha === 0) {
|
|
buffer[i] = 255;
|
|
buffer[i + 1] = 255;
|
|
buffer[i + 2] = 255;
|
|
continue;
|
|
}
|
|
|
|
const k = 255 / alpha;
|
|
buffer[i] = (buffer[i] - matteR) * k + matteR;
|
|
buffer[i + 1] = (buffer[i + 1] - matteG) * k + matteG;
|
|
buffer[i + 2] = (buffer[i + 2] - matteB) * k + matteB;
|
|
}
|
|
}
|
|
|
|
createImageData(forceRGBA = false) {
|
|
const drawWidth = this.drawWidth;
|
|
const drawHeight = this.drawHeight;
|
|
const imgData = {
|
|
width: drawWidth,
|
|
height: drawHeight,
|
|
interpolate: this.interpolate,
|
|
kind: 0,
|
|
data: null
|
|
};
|
|
const numComps = this.numComps;
|
|
const originalWidth = this.width;
|
|
const originalHeight = this.height;
|
|
const bpc = this.bpc;
|
|
const rowBytes = originalWidth * numComps * bpc + 7 >> 3;
|
|
|
|
if (!forceRGBA) {
|
|
let kind;
|
|
|
|
if (this.colorSpace.name === "DeviceGray" && bpc === 1) {
|
|
kind = _util.ImageKind.GRAYSCALE_1BPP;
|
|
} else if (this.colorSpace.name === "DeviceRGB" && bpc === 8 && !this.needsDecode) {
|
|
kind = _util.ImageKind.RGB_24BPP;
|
|
}
|
|
|
|
if (kind && !this.smask && !this.mask && drawWidth === originalWidth && drawHeight === originalHeight) {
|
|
imgData.kind = kind;
|
|
imgData.data = this.getImageBytes(originalHeight * rowBytes, {});
|
|
|
|
if (this.needsDecode) {
|
|
(0, _util.assert)(kind === _util.ImageKind.GRAYSCALE_1BPP, "PDFImage.createImageData: The image must be grayscale.");
|
|
const buffer = imgData.data;
|
|
|
|
for (let i = 0, ii = buffer.length; i < ii; i++) {
|
|
buffer[i] ^= 0xff;
|
|
}
|
|
}
|
|
|
|
return imgData;
|
|
}
|
|
|
|
if (this.image instanceof _jpeg_stream.JpegStream && !this.smask && !this.mask) {
|
|
let imageLength = originalHeight * rowBytes;
|
|
|
|
switch (this.colorSpace.name) {
|
|
case "DeviceGray":
|
|
imageLength *= 3;
|
|
|
|
case "DeviceRGB":
|
|
case "DeviceCMYK":
|
|
imgData.kind = _util.ImageKind.RGB_24BPP;
|
|
imgData.data = this.getImageBytes(imageLength, {
|
|
drawWidth,
|
|
drawHeight,
|
|
forceRGB: true
|
|
});
|
|
return imgData;
|
|
}
|
|
}
|
|
}
|
|
|
|
const imgArray = this.getImageBytes(originalHeight * rowBytes, {
|
|
internal: true
|
|
});
|
|
const actualHeight = 0 | imgArray.length / rowBytes * drawHeight / originalHeight;
|
|
const comps = this.getComponents(imgArray);
|
|
let alpha01, maybeUndoPreblend;
|
|
|
|
if (!forceRGBA && !this.smask && !this.mask) {
|
|
imgData.kind = _util.ImageKind.RGB_24BPP;
|
|
imgData.data = new Uint8ClampedArray(drawWidth * drawHeight * 3);
|
|
alpha01 = 0;
|
|
maybeUndoPreblend = false;
|
|
} else {
|
|
imgData.kind = _util.ImageKind.RGBA_32BPP;
|
|
imgData.data = new Uint8ClampedArray(drawWidth * drawHeight * 4);
|
|
alpha01 = 1;
|
|
maybeUndoPreblend = true;
|
|
this.fillOpacity(imgData.data, drawWidth, drawHeight, actualHeight, comps);
|
|
}
|
|
|
|
if (this.needsDecode) {
|
|
this.decodeBuffer(comps);
|
|
}
|
|
|
|
this.colorSpace.fillRgb(imgData.data, originalWidth, originalHeight, drawWidth, drawHeight, actualHeight, bpc, comps, alpha01);
|
|
|
|
if (maybeUndoPreblend) {
|
|
this.undoPreblend(imgData.data, drawWidth, actualHeight);
|
|
}
|
|
|
|
return imgData;
|
|
}
|
|
|
|
fillGrayBuffer(buffer) {
|
|
const numComps = this.numComps;
|
|
|
|
if (numComps !== 1) {
|
|
throw new _util.FormatError(`Reading gray scale from a color image: ${numComps}`);
|
|
}
|
|
|
|
const width = this.width;
|
|
const height = this.height;
|
|
const bpc = this.bpc;
|
|
const rowBytes = width * numComps * bpc + 7 >> 3;
|
|
const imgArray = this.getImageBytes(height * rowBytes, {
|
|
internal: true
|
|
});
|
|
const comps = this.getComponents(imgArray);
|
|
let i, length;
|
|
|
|
if (bpc === 1) {
|
|
length = width * height;
|
|
|
|
if (this.needsDecode) {
|
|
for (i = 0; i < length; ++i) {
|
|
buffer[i] = comps[i] - 1 & 255;
|
|
}
|
|
} else {
|
|
for (i = 0; i < length; ++i) {
|
|
buffer[i] = -comps[i] & 255;
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if (this.needsDecode) {
|
|
this.decodeBuffer(comps);
|
|
}
|
|
|
|
length = width * height;
|
|
const scale = 255 / ((1 << bpc) - 1);
|
|
|
|
for (i = 0; i < length; ++i) {
|
|
buffer[i] = scale * comps[i];
|
|
}
|
|
}
|
|
|
|
getImageBytes(length, {
|
|
drawWidth,
|
|
drawHeight,
|
|
forceRGB = false,
|
|
internal = false
|
|
}) {
|
|
this.image.reset();
|
|
this.image.drawWidth = drawWidth || this.width;
|
|
this.image.drawHeight = drawHeight || this.height;
|
|
this.image.forceRGB = !!forceRGB;
|
|
const imageBytes = this.image.getBytes(length);
|
|
|
|
if (internal || this.image instanceof _decode_stream.DecodeStream) {
|
|
return imageBytes;
|
|
}
|
|
|
|
(0, _util.assert)(imageBytes instanceof Uint8Array, 'PDFImage.getImageBytes: Unsupported "imageBytes" type.');
|
|
return new Uint8Array(imageBytes);
|
|
}
|
|
|
|
}
|
|
|
|
exports.PDFImage = PDFImage; |