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21 |
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22 | "use strict";
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23 |
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24 | Object.defineProperty(exports, "__esModule", {
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25 | value: true
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26 | });
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27 | exports.JpegStream = void 0;
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28 |
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29 | var _util = require("../shared/util");
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30 |
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31 | var _stream = require("./stream");
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32 |
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33 | var _primitives = require("./primitives");
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34 |
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35 | var _jpg = require("./jpg");
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36 |
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37 | var JpegStream = function JpegStreamClosure() {
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38 | function JpegStream(stream, maybeLength, dict, params) {
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39 | var ch;
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40 |
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41 | while ((ch = stream.getByte()) !== -1) {
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42 | if (ch === 0xFF) {
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43 | stream.skip(-1);
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44 | break;
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45 | }
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46 | }
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47 |
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48 | this.stream = stream;
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49 | this.maybeLength = maybeLength;
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50 | this.dict = dict;
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51 | this.params = params;
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52 |
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53 | _stream.DecodeStream.call(this, maybeLength);
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54 | }
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55 |
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56 | JpegStream.prototype = Object.create(_stream.DecodeStream.prototype);
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57 | Object.defineProperty(JpegStream.prototype, 'bytes', {
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58 | get: function JpegStream_bytes() {
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59 | return (0, _util.shadow)(this, 'bytes', this.stream.getBytes(this.maybeLength));
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60 | },
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61 | configurable: true
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62 | });
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63 |
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64 | JpegStream.prototype.ensureBuffer = function (requested) {};
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65 |
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66 | JpegStream.prototype.readBlock = function () {
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67 | if (this.eof) {
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68 | return;
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69 | }
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70 |
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71 | var jpegOptions = {
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72 | decodeTransform: undefined,
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73 | colorTransform: undefined
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74 | };
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75 | var decodeArr = this.dict.getArray('Decode', 'D');
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76 |
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77 | if (this.forceRGB && Array.isArray(decodeArr)) {
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78 | var bitsPerComponent = this.dict.get('BitsPerComponent') || 8;
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79 | var decodeArrLength = decodeArr.length;
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80 | var transform = new Int32Array(decodeArrLength);
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81 | var transformNeeded = false;
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82 | var maxValue = (1 << bitsPerComponent) - 1;
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83 |
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84 | for (var i = 0; i < decodeArrLength; i += 2) {
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85 | transform[i] = (decodeArr[i + 1] - decodeArr[i]) * 256 | 0;
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86 | transform[i + 1] = decodeArr[i] * maxValue | 0;
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87 |
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88 | if (transform[i] !== 256 || transform[i + 1] !== 0) {
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89 | transformNeeded = true;
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90 | }
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91 | }
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92 |
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93 | if (transformNeeded) {
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94 | jpegOptions.decodeTransform = transform;
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95 | }
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96 | }
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97 |
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98 | if ((0, _primitives.isDict)(this.params)) {
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99 | var colorTransform = this.params.get('ColorTransform');
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100 |
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101 | if (Number.isInteger(colorTransform)) {
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102 | jpegOptions.colorTransform = colorTransform;
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103 | }
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104 | }
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105 |
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106 | var jpegImage = new _jpg.JpegImage(jpegOptions);
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107 | jpegImage.parse(this.bytes);
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108 | var data = jpegImage.getData({
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109 | width: this.drawWidth,
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110 | height: this.drawHeight,
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111 | forceRGB: this.forceRGB,
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112 | isSourcePDF: true
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113 | });
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114 | this.buffer = data;
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115 | this.bufferLength = data.length;
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116 | this.eof = true;
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117 | };
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118 |
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119 | JpegStream.prototype.getIR = function () {
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120 | var forceDataSchema = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : false;
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121 | return (0, _util.createObjectURL)(this.bytes, 'image/jpeg', forceDataSchema);
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122 | };
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123 |
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124 | return JpegStream;
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125 | }();
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126 |
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127 | exports.JpegStream = JpegStream; |
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