1 |
|
2 |
|
3 |
|
4 |
|
5 |
|
6 |
|
7 |
|
8 |
|
9 |
|
10 |
|
11 |
|
12 |
|
13 |
|
14 |
|
15 |
|
16 |
|
17 |
|
18 |
|
19 |
|
20 |
|
21 |
|
22 | "use strict";
|
23 |
|
24 | Object.defineProperty(exports, "__esModule", {
|
25 | value: true
|
26 | });
|
27 | exports.JpegImage = void 0;
|
28 |
|
29 | var _util = require("../shared/util");
|
30 |
|
31 | function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
|
32 |
|
33 | var JpegError = function JpegErrorClosure() {
|
34 | function JpegError(msg) {
|
35 | this.message = 'JPEG error: ' + msg;
|
36 | }
|
37 |
|
38 | JpegError.prototype = new Error();
|
39 | JpegError.prototype.name = 'JpegError';
|
40 | JpegError.constructor = JpegError;
|
41 | return JpegError;
|
42 | }();
|
43 |
|
44 | var DNLMarkerError = function DNLMarkerErrorClosure() {
|
45 | function DNLMarkerError(message, scanLines) {
|
46 | this.message = message;
|
47 | this.scanLines = scanLines;
|
48 | }
|
49 |
|
50 | DNLMarkerError.prototype = new Error();
|
51 | DNLMarkerError.prototype.name = 'DNLMarkerError';
|
52 | DNLMarkerError.constructor = DNLMarkerError;
|
53 | return DNLMarkerError;
|
54 | }();
|
55 |
|
56 | var EOIMarkerError = function EOIMarkerErrorClosure() {
|
57 | function EOIMarkerError(message) {
|
58 | this.message = message;
|
59 | }
|
60 |
|
61 | EOIMarkerError.prototype = new Error();
|
62 | EOIMarkerError.prototype.name = 'EOIMarkerError';
|
63 | EOIMarkerError.constructor = EOIMarkerError;
|
64 | return EOIMarkerError;
|
65 | }();
|
66 |
|
67 | var JpegImage = function JpegImageClosure() {
|
68 | var dctZigZag = new Uint8Array([0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5, 12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28, 35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51, 58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63]);
|
69 | var dctCos1 = 4017;
|
70 | var dctSin1 = 799;
|
71 | var dctCos3 = 3406;
|
72 | var dctSin3 = 2276;
|
73 | var dctCos6 = 1567;
|
74 | var dctSin6 = 3784;
|
75 | var dctSqrt2 = 5793;
|
76 | var dctSqrt1d2 = 2896;
|
77 |
|
78 | function JpegImage() {
|
79 | var _ref = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {},
|
80 | _ref$decodeTransform = _ref.decodeTransform,
|
81 | decodeTransform = _ref$decodeTransform === void 0 ? null : _ref$decodeTransform,
|
82 | _ref$colorTransform = _ref.colorTransform,
|
83 | colorTransform = _ref$colorTransform === void 0 ? -1 : _ref$colorTransform;
|
84 |
|
85 | this._decodeTransform = decodeTransform;
|
86 | this._colorTransform = colorTransform;
|
87 | }
|
88 |
|
89 | function buildHuffmanTable(codeLengths, values) {
|
90 | var k = 0,
|
91 | code = [],
|
92 | i,
|
93 | j,
|
94 | length = 16;
|
95 |
|
96 | while (length > 0 && !codeLengths[length - 1]) {
|
97 | length--;
|
98 | }
|
99 |
|
100 | code.push({
|
101 | children: [],
|
102 | index: 0
|
103 | });
|
104 | var p = code[0],
|
105 | q;
|
106 |
|
107 | for (i = 0; i < length; i++) {
|
108 | for (j = 0; j < codeLengths[i]; j++) {
|
109 | p = code.pop();
|
110 | p.children[p.index] = values[k];
|
111 |
|
112 | while (p.index > 0) {
|
113 | p = code.pop();
|
114 | }
|
115 |
|
116 | p.index++;
|
117 | code.push(p);
|
118 |
|
119 | while (code.length <= i) {
|
120 | code.push(q = {
|
121 | children: [],
|
122 | index: 0
|
123 | });
|
124 | p.children[p.index] = q.children;
|
125 | p = q;
|
126 | }
|
127 |
|
128 | k++;
|
129 | }
|
130 |
|
131 | if (i + 1 < length) {
|
132 | code.push(q = {
|
133 | children: [],
|
134 | index: 0
|
135 | });
|
136 | p.children[p.index] = q.children;
|
137 | p = q;
|
138 | }
|
139 | }
|
140 |
|
141 | return code[0].children;
|
142 | }
|
143 |
|
144 | function getBlockBufferOffset(component, row, col) {
|
145 | return 64 * ((component.blocksPerLine + 1) * row + col);
|
146 | }
|
147 |
|
148 | function decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successivePrev, successive) {
|
149 | var parseDNLMarker = arguments.length > 9 && arguments[9] !== undefined ? arguments[9] : false;
|
150 | var mcusPerLine = frame.mcusPerLine;
|
151 | var progressive = frame.progressive;
|
152 | var startOffset = offset,
|
153 | bitsData = 0,
|
154 | bitsCount = 0;
|
155 |
|
156 | function readBit() {
|
157 | if (bitsCount > 0) {
|
158 | bitsCount--;
|
159 | return bitsData >> bitsCount & 1;
|
160 | }
|
161 |
|
162 | bitsData = data[offset++];
|
163 |
|
164 | if (bitsData === 0xFF) {
|
165 | var nextByte = data[offset++];
|
166 |
|
167 | if (nextByte) {
|
168 | if (nextByte === 0xDC && parseDNLMarker) {
|
169 | offset += 2;
|
170 | var scanLines = data[offset++] << 8 | data[offset++];
|
171 |
|
172 | if (scanLines > 0 && scanLines !== frame.scanLines) {
|
173 | throw new DNLMarkerError('Found DNL marker (0xFFDC) while parsing scan data', scanLines);
|
174 | }
|
175 | } else if (nextByte === 0xD9) {
|
176 | throw new EOIMarkerError('Found EOI marker (0xFFD9) while parsing scan data');
|
177 | }
|
178 |
|
179 | throw new JpegError("unexpected marker ".concat((bitsData << 8 | nextByte).toString(16)));
|
180 | }
|
181 | }
|
182 |
|
183 | bitsCount = 7;
|
184 | return bitsData >>> 7;
|
185 | }
|
186 |
|
187 | function decodeHuffman(tree) {
|
188 | var node = tree;
|
189 |
|
190 | while (true) {
|
191 | node = node[readBit()];
|
192 |
|
193 | if (typeof node === 'number') {
|
194 | return node;
|
195 | }
|
196 |
|
197 | if (_typeof(node) !== 'object') {
|
198 | throw new JpegError('invalid huffman sequence');
|
199 | }
|
200 | }
|
201 | }
|
202 |
|
203 | function receive(length) {
|
204 | var n = 0;
|
205 |
|
206 | while (length > 0) {
|
207 | n = n << 1 | readBit();
|
208 | length--;
|
209 | }
|
210 |
|
211 | return n;
|
212 | }
|
213 |
|
214 | function receiveAndExtend(length) {
|
215 | if (length === 1) {
|
216 | return readBit() === 1 ? 1 : -1;
|
217 | }
|
218 |
|
219 | var n = receive(length);
|
220 |
|
221 | if (n >= 1 << length - 1) {
|
222 | return n;
|
223 | }
|
224 |
|
225 | return n + (-1 << length) + 1;
|
226 | }
|
227 |
|
228 | function decodeBaseline(component, offset) {
|
229 | var t = decodeHuffman(component.huffmanTableDC);
|
230 | var diff = t === 0 ? 0 : receiveAndExtend(t);
|
231 | component.blockData[offset] = component.pred += diff;
|
232 | var k = 1;
|
233 |
|
234 | while (k < 64) {
|
235 | var rs = decodeHuffman(component.huffmanTableAC);
|
236 | var s = rs & 15,
|
237 | r = rs >> 4;
|
238 |
|
239 | if (s === 0) {
|
240 | if (r < 15) {
|
241 | break;
|
242 | }
|
243 |
|
244 | k += 16;
|
245 | continue;
|
246 | }
|
247 |
|
248 | k += r;
|
249 | var z = dctZigZag[k];
|
250 | component.blockData[offset + z] = receiveAndExtend(s);
|
251 | k++;
|
252 | }
|
253 | }
|
254 |
|
255 | function decodeDCFirst(component, offset) {
|
256 | var t = decodeHuffman(component.huffmanTableDC);
|
257 | var diff = t === 0 ? 0 : receiveAndExtend(t) << successive;
|
258 | component.blockData[offset] = component.pred += diff;
|
259 | }
|
260 |
|
261 | function decodeDCSuccessive(component, offset) {
|
262 | component.blockData[offset] |= readBit() << successive;
|
263 | }
|
264 |
|
265 | var eobrun = 0;
|
266 |
|
267 | function decodeACFirst(component, offset) {
|
268 | if (eobrun > 0) {
|
269 | eobrun--;
|
270 | return;
|
271 | }
|
272 |
|
273 | var k = spectralStart,
|
274 | e = spectralEnd;
|
275 |
|
276 | while (k <= e) {
|
277 | var rs = decodeHuffman(component.huffmanTableAC);
|
278 | var s = rs & 15,
|
279 | r = rs >> 4;
|
280 |
|
281 | if (s === 0) {
|
282 | if (r < 15) {
|
283 | eobrun = receive(r) + (1 << r) - 1;
|
284 | break;
|
285 | }
|
286 |
|
287 | k += 16;
|
288 | continue;
|
289 | }
|
290 |
|
291 | k += r;
|
292 | var z = dctZigZag[k];
|
293 | component.blockData[offset + z] = receiveAndExtend(s) * (1 << successive);
|
294 | k++;
|
295 | }
|
296 | }
|
297 |
|
298 | var successiveACState = 0,
|
299 | successiveACNextValue;
|
300 |
|
301 | function decodeACSuccessive(component, offset) {
|
302 | var k = spectralStart;
|
303 | var e = spectralEnd;
|
304 | var r = 0;
|
305 | var s;
|
306 | var rs;
|
307 |
|
308 | while (k <= e) {
|
309 | var offsetZ = offset + dctZigZag[k];
|
310 | var sign = component.blockData[offsetZ] < 0 ? -1 : 1;
|
311 |
|
312 | switch (successiveACState) {
|
313 | case 0:
|
314 | rs = decodeHuffman(component.huffmanTableAC);
|
315 | s = rs & 15;
|
316 | r = rs >> 4;
|
317 |
|
318 | if (s === 0) {
|
319 | if (r < 15) {
|
320 | eobrun = receive(r) + (1 << r);
|
321 | successiveACState = 4;
|
322 | } else {
|
323 | r = 16;
|
324 | successiveACState = 1;
|
325 | }
|
326 | } else {
|
327 | if (s !== 1) {
|
328 | throw new JpegError('invalid ACn encoding');
|
329 | }
|
330 |
|
331 | successiveACNextValue = receiveAndExtend(s);
|
332 | successiveACState = r ? 2 : 3;
|
333 | }
|
334 |
|
335 | continue;
|
336 |
|
337 | case 1:
|
338 | case 2:
|
339 | if (component.blockData[offsetZ]) {
|
340 | component.blockData[offsetZ] += sign * (readBit() << successive);
|
341 | } else {
|
342 | r--;
|
343 |
|
344 | if (r === 0) {
|
345 | successiveACState = successiveACState === 2 ? 3 : 0;
|
346 | }
|
347 | }
|
348 |
|
349 | break;
|
350 |
|
351 | case 3:
|
352 | if (component.blockData[offsetZ]) {
|
353 | component.blockData[offsetZ] += sign * (readBit() << successive);
|
354 | } else {
|
355 | component.blockData[offsetZ] = successiveACNextValue << successive;
|
356 | successiveACState = 0;
|
357 | }
|
358 |
|
359 | break;
|
360 |
|
361 | case 4:
|
362 | if (component.blockData[offsetZ]) {
|
363 | component.blockData[offsetZ] += sign * (readBit() << successive);
|
364 | }
|
365 |
|
366 | break;
|
367 | }
|
368 |
|
369 | k++;
|
370 | }
|
371 |
|
372 | if (successiveACState === 4) {
|
373 | eobrun--;
|
374 |
|
375 | if (eobrun === 0) {
|
376 | successiveACState = 0;
|
377 | }
|
378 | }
|
379 | }
|
380 |
|
381 | function decodeMcu(component, decode, mcu, row, col) {
|
382 | var mcuRow = mcu / mcusPerLine | 0;
|
383 | var mcuCol = mcu % mcusPerLine;
|
384 | var blockRow = mcuRow * component.v + row;
|
385 | var blockCol = mcuCol * component.h + col;
|
386 | var offset = getBlockBufferOffset(component, blockRow, blockCol);
|
387 | decode(component, offset);
|
388 | }
|
389 |
|
390 | function decodeBlock(component, decode, mcu) {
|
391 | var blockRow = mcu / component.blocksPerLine | 0;
|
392 | var blockCol = mcu % component.blocksPerLine;
|
393 | var offset = getBlockBufferOffset(component, blockRow, blockCol);
|
394 | decode(component, offset);
|
395 | }
|
396 |
|
397 | var componentsLength = components.length;
|
398 | var component, i, j, k, n;
|
399 | var decodeFn;
|
400 |
|
401 | if (progressive) {
|
402 | if (spectralStart === 0) {
|
403 | decodeFn = successivePrev === 0 ? decodeDCFirst : decodeDCSuccessive;
|
404 | } else {
|
405 | decodeFn = successivePrev === 0 ? decodeACFirst : decodeACSuccessive;
|
406 | }
|
407 | } else {
|
408 | decodeFn = decodeBaseline;
|
409 | }
|
410 |
|
411 | var mcu = 0,
|
412 | fileMarker;
|
413 | var mcuExpected;
|
414 |
|
415 | if (componentsLength === 1) {
|
416 | mcuExpected = components[0].blocksPerLine * components[0].blocksPerColumn;
|
417 | } else {
|
418 | mcuExpected = mcusPerLine * frame.mcusPerColumn;
|
419 | }
|
420 |
|
421 | var h, v;
|
422 |
|
423 | while (mcu < mcuExpected) {
|
424 | var mcuToRead = resetInterval ? Math.min(mcuExpected - mcu, resetInterval) : mcuExpected;
|
425 |
|
426 | for (i = 0; i < componentsLength; i++) {
|
427 | components[i].pred = 0;
|
428 | }
|
429 |
|
430 | eobrun = 0;
|
431 |
|
432 | if (componentsLength === 1) {
|
433 | component = components[0];
|
434 |
|
435 | for (n = 0; n < mcuToRead; n++) {
|
436 | decodeBlock(component, decodeFn, mcu);
|
437 | mcu++;
|
438 | }
|
439 | } else {
|
440 | for (n = 0; n < mcuToRead; n++) {
|
441 | for (i = 0; i < componentsLength; i++) {
|
442 | component = components[i];
|
443 | h = component.h;
|
444 | v = component.v;
|
445 |
|
446 | for (j = 0; j < v; j++) {
|
447 | for (k = 0; k < h; k++) {
|
448 | decodeMcu(component, decodeFn, mcu, j, k);
|
449 | }
|
450 | }
|
451 | }
|
452 |
|
453 | mcu++;
|
454 | }
|
455 | }
|
456 |
|
457 | bitsCount = 0;
|
458 | fileMarker = findNextFileMarker(data, offset);
|
459 |
|
460 | if (fileMarker && fileMarker.invalid) {
|
461 | (0, _util.warn)('decodeScan - unexpected MCU data, current marker is: ' + fileMarker.invalid);
|
462 | offset = fileMarker.offset;
|
463 | }
|
464 |
|
465 | var marker = fileMarker && fileMarker.marker;
|
466 |
|
467 | if (!marker || marker <= 0xFF00) {
|
468 | throw new JpegError('marker was not found');
|
469 | }
|
470 |
|
471 | if (marker >= 0xFFD0 && marker <= 0xFFD7) {
|
472 | offset += 2;
|
473 | } else {
|
474 | break;
|
475 | }
|
476 | }
|
477 |
|
478 | fileMarker = findNextFileMarker(data, offset);
|
479 |
|
480 | if (fileMarker && fileMarker.invalid) {
|
481 | (0, _util.warn)('decodeScan - unexpected Scan data, current marker is: ' + fileMarker.invalid);
|
482 | offset = fileMarker.offset;
|
483 | }
|
484 |
|
485 | return offset - startOffset;
|
486 | }
|
487 |
|
488 | function quantizeAndInverse(component, blockBufferOffset, p) {
|
489 | var qt = component.quantizationTable,
|
490 | blockData = component.blockData;
|
491 | var v0, v1, v2, v3, v4, v5, v6, v7;
|
492 | var p0, p1, p2, p3, p4, p5, p6, p7;
|
493 | var t;
|
494 |
|
495 | if (!qt) {
|
496 | throw new JpegError('missing required Quantization Table.');
|
497 | }
|
498 |
|
499 | for (var row = 0; row < 64; row += 8) {
|
500 | p0 = blockData[blockBufferOffset + row];
|
501 | p1 = blockData[blockBufferOffset + row + 1];
|
502 | p2 = blockData[blockBufferOffset + row + 2];
|
503 | p3 = blockData[blockBufferOffset + row + 3];
|
504 | p4 = blockData[blockBufferOffset + row + 4];
|
505 | p5 = blockData[blockBufferOffset + row + 5];
|
506 | p6 = blockData[blockBufferOffset + row + 6];
|
507 | p7 = blockData[blockBufferOffset + row + 7];
|
508 | p0 *= qt[row];
|
509 |
|
510 | if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {
|
511 | t = dctSqrt2 * p0 + 512 >> 10;
|
512 | p[row] = t;
|
513 | p[row + 1] = t;
|
514 | p[row + 2] = t;
|
515 | p[row + 3] = t;
|
516 | p[row + 4] = t;
|
517 | p[row + 5] = t;
|
518 | p[row + 6] = t;
|
519 | p[row + 7] = t;
|
520 | continue;
|
521 | }
|
522 |
|
523 | p1 *= qt[row + 1];
|
524 | p2 *= qt[row + 2];
|
525 | p3 *= qt[row + 3];
|
526 | p4 *= qt[row + 4];
|
527 | p5 *= qt[row + 5];
|
528 | p6 *= qt[row + 6];
|
529 | p7 *= qt[row + 7];
|
530 | v0 = dctSqrt2 * p0 + 128 >> 8;
|
531 | v1 = dctSqrt2 * p4 + 128 >> 8;
|
532 | v2 = p2;
|
533 | v3 = p6;
|
534 | v4 = dctSqrt1d2 * (p1 - p7) + 128 >> 8;
|
535 | v7 = dctSqrt1d2 * (p1 + p7) + 128 >> 8;
|
536 | v5 = p3 << 4;
|
537 | v6 = p5 << 4;
|
538 | v0 = v0 + v1 + 1 >> 1;
|
539 | v1 = v0 - v1;
|
540 | t = v2 * dctSin6 + v3 * dctCos6 + 128 >> 8;
|
541 | v2 = v2 * dctCos6 - v3 * dctSin6 + 128 >> 8;
|
542 | v3 = t;
|
543 | v4 = v4 + v6 + 1 >> 1;
|
544 | v6 = v4 - v6;
|
545 | v7 = v7 + v5 + 1 >> 1;
|
546 | v5 = v7 - v5;
|
547 | v0 = v0 + v3 + 1 >> 1;
|
548 | v3 = v0 - v3;
|
549 | v1 = v1 + v2 + 1 >> 1;
|
550 | v2 = v1 - v2;
|
551 | t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
|
552 | v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
|
553 | v7 = t;
|
554 | t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
|
555 | v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
|
556 | v6 = t;
|
557 | p[row] = v0 + v7;
|
558 | p[row + 7] = v0 - v7;
|
559 | p[row + 1] = v1 + v6;
|
560 | p[row + 6] = v1 - v6;
|
561 | p[row + 2] = v2 + v5;
|
562 | p[row + 5] = v2 - v5;
|
563 | p[row + 3] = v3 + v4;
|
564 | p[row + 4] = v3 - v4;
|
565 | }
|
566 |
|
567 | for (var col = 0; col < 8; ++col) {
|
568 | p0 = p[col];
|
569 | p1 = p[col + 8];
|
570 | p2 = p[col + 16];
|
571 | p3 = p[col + 24];
|
572 | p4 = p[col + 32];
|
573 | p5 = p[col + 40];
|
574 | p6 = p[col + 48];
|
575 | p7 = p[col + 56];
|
576 |
|
577 | if ((p1 | p2 | p3 | p4 | p5 | p6 | p7) === 0) {
|
578 | t = dctSqrt2 * p0 + 8192 >> 14;
|
579 | t = t < -2040 ? 0 : t >= 2024 ? 255 : t + 2056 >> 4;
|
580 | blockData[blockBufferOffset + col] = t;
|
581 | blockData[blockBufferOffset + col + 8] = t;
|
582 | blockData[blockBufferOffset + col + 16] = t;
|
583 | blockData[blockBufferOffset + col + 24] = t;
|
584 | blockData[blockBufferOffset + col + 32] = t;
|
585 | blockData[blockBufferOffset + col + 40] = t;
|
586 | blockData[blockBufferOffset + col + 48] = t;
|
587 | blockData[blockBufferOffset + col + 56] = t;
|
588 | continue;
|
589 | }
|
590 |
|
591 | v0 = dctSqrt2 * p0 + 2048 >> 12;
|
592 | v1 = dctSqrt2 * p4 + 2048 >> 12;
|
593 | v2 = p2;
|
594 | v3 = p6;
|
595 | v4 = dctSqrt1d2 * (p1 - p7) + 2048 >> 12;
|
596 | v7 = dctSqrt1d2 * (p1 + p7) + 2048 >> 12;
|
597 | v5 = p3;
|
598 | v6 = p5;
|
599 | v0 = (v0 + v1 + 1 >> 1) + 4112;
|
600 | v1 = v0 - v1;
|
601 | t = v2 * dctSin6 + v3 * dctCos6 + 2048 >> 12;
|
602 | v2 = v2 * dctCos6 - v3 * dctSin6 + 2048 >> 12;
|
603 | v3 = t;
|
604 | v4 = v4 + v6 + 1 >> 1;
|
605 | v6 = v4 - v6;
|
606 | v7 = v7 + v5 + 1 >> 1;
|
607 | v5 = v7 - v5;
|
608 | v0 = v0 + v3 + 1 >> 1;
|
609 | v3 = v0 - v3;
|
610 | v1 = v1 + v2 + 1 >> 1;
|
611 | v2 = v1 - v2;
|
612 | t = v4 * dctSin3 + v7 * dctCos3 + 2048 >> 12;
|
613 | v4 = v4 * dctCos3 - v7 * dctSin3 + 2048 >> 12;
|
614 | v7 = t;
|
615 | t = v5 * dctSin1 + v6 * dctCos1 + 2048 >> 12;
|
616 | v5 = v5 * dctCos1 - v6 * dctSin1 + 2048 >> 12;
|
617 | v6 = t;
|
618 | p0 = v0 + v7;
|
619 | p7 = v0 - v7;
|
620 | p1 = v1 + v6;
|
621 | p6 = v1 - v6;
|
622 | p2 = v2 + v5;
|
623 | p5 = v2 - v5;
|
624 | p3 = v3 + v4;
|
625 | p4 = v3 - v4;
|
626 | p0 = p0 < 16 ? 0 : p0 >= 4080 ? 255 : p0 >> 4;
|
627 | p1 = p1 < 16 ? 0 : p1 >= 4080 ? 255 : p1 >> 4;
|
628 | p2 = p2 < 16 ? 0 : p2 >= 4080 ? 255 : p2 >> 4;
|
629 | p3 = p3 < 16 ? 0 : p3 >= 4080 ? 255 : p3 >> 4;
|
630 | p4 = p4 < 16 ? 0 : p4 >= 4080 ? 255 : p4 >> 4;
|
631 | p5 = p5 < 16 ? 0 : p5 >= 4080 ? 255 : p5 >> 4;
|
632 | p6 = p6 < 16 ? 0 : p6 >= 4080 ? 255 : p6 >> 4;
|
633 | p7 = p7 < 16 ? 0 : p7 >= 4080 ? 255 : p7 >> 4;
|
634 | blockData[blockBufferOffset + col] = p0;
|
635 | blockData[blockBufferOffset + col + 8] = p1;
|
636 | blockData[blockBufferOffset + col + 16] = p2;
|
637 | blockData[blockBufferOffset + col + 24] = p3;
|
638 | blockData[blockBufferOffset + col + 32] = p4;
|
639 | blockData[blockBufferOffset + col + 40] = p5;
|
640 | blockData[blockBufferOffset + col + 48] = p6;
|
641 | blockData[blockBufferOffset + col + 56] = p7;
|
642 | }
|
643 | }
|
644 |
|
645 | function buildComponentData(frame, component) {
|
646 | var blocksPerLine = component.blocksPerLine;
|
647 | var blocksPerColumn = component.blocksPerColumn;
|
648 | var computationBuffer = new Int16Array(64);
|
649 |
|
650 | for (var blockRow = 0; blockRow < blocksPerColumn; blockRow++) {
|
651 | for (var blockCol = 0; blockCol < blocksPerLine; blockCol++) {
|
652 | var offset = getBlockBufferOffset(component, blockRow, blockCol);
|
653 | quantizeAndInverse(component, offset, computationBuffer);
|
654 | }
|
655 | }
|
656 |
|
657 | return component.blockData;
|
658 | }
|
659 |
|
660 | function findNextFileMarker(data, currentPos) {
|
661 | var startPos = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : currentPos;
|
662 |
|
663 | function peekUint16(pos) {
|
664 | return data[pos] << 8 | data[pos + 1];
|
665 | }
|
666 |
|
667 | var maxPos = data.length - 1;
|
668 | var newPos = startPos < currentPos ? startPos : currentPos;
|
669 |
|
670 | if (currentPos >= maxPos) {
|
671 | return null;
|
672 | }
|
673 |
|
674 | var currentMarker = peekUint16(currentPos);
|
675 |
|
676 | if (currentMarker >= 0xFFC0 && currentMarker <= 0xFFFE) {
|
677 | return {
|
678 | invalid: null,
|
679 | marker: currentMarker,
|
680 | offset: currentPos
|
681 | };
|
682 | }
|
683 |
|
684 | var newMarker = peekUint16(newPos);
|
685 |
|
686 | while (!(newMarker >= 0xFFC0 && newMarker <= 0xFFFE)) {
|
687 | if (++newPos >= maxPos) {
|
688 | return null;
|
689 | }
|
690 |
|
691 | newMarker = peekUint16(newPos);
|
692 | }
|
693 |
|
694 | return {
|
695 | invalid: currentMarker.toString(16),
|
696 | marker: newMarker,
|
697 | offset: newPos
|
698 | };
|
699 | }
|
700 |
|
701 | JpegImage.prototype = {
|
702 | parse: function parse(data) {
|
703 | var _ref2 = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
|
704 | _ref2$dnlScanLines = _ref2.dnlScanLines,
|
705 | dnlScanLines = _ref2$dnlScanLines === void 0 ? null : _ref2$dnlScanLines;
|
706 |
|
707 | function readUint16() {
|
708 | var value = data[offset] << 8 | data[offset + 1];
|
709 | offset += 2;
|
710 | return value;
|
711 | }
|
712 |
|
713 | function readDataBlock() {
|
714 | var length = readUint16();
|
715 | var endOffset = offset + length - 2;
|
716 | var fileMarker = findNextFileMarker(data, endOffset, offset);
|
717 |
|
718 | if (fileMarker && fileMarker.invalid) {
|
719 | (0, _util.warn)('readDataBlock - incorrect length, current marker is: ' + fileMarker.invalid);
|
720 | endOffset = fileMarker.offset;
|
721 | }
|
722 |
|
723 | var array = data.subarray(offset, endOffset);
|
724 | offset += array.length;
|
725 | return array;
|
726 | }
|
727 |
|
728 | function prepareComponents(frame) {
|
729 | var mcusPerLine = Math.ceil(frame.samplesPerLine / 8 / frame.maxH);
|
730 | var mcusPerColumn = Math.ceil(frame.scanLines / 8 / frame.maxV);
|
731 |
|
732 | for (var i = 0; i < frame.components.length; i++) {
|
733 | component = frame.components[i];
|
734 | var blocksPerLine = Math.ceil(Math.ceil(frame.samplesPerLine / 8) * component.h / frame.maxH);
|
735 | var blocksPerColumn = Math.ceil(Math.ceil(frame.scanLines / 8) * component.v / frame.maxV);
|
736 | var blocksPerLineForMcu = mcusPerLine * component.h;
|
737 | var blocksPerColumnForMcu = mcusPerColumn * component.v;
|
738 | var blocksBufferSize = 64 * blocksPerColumnForMcu * (blocksPerLineForMcu + 1);
|
739 | component.blockData = new Int16Array(blocksBufferSize);
|
740 | component.blocksPerLine = blocksPerLine;
|
741 | component.blocksPerColumn = blocksPerColumn;
|
742 | }
|
743 |
|
744 | frame.mcusPerLine = mcusPerLine;
|
745 | frame.mcusPerColumn = mcusPerColumn;
|
746 | }
|
747 |
|
748 | var offset = 0;
|
749 | var jfif = null;
|
750 | var adobe = null;
|
751 | var frame, resetInterval;
|
752 | var numSOSMarkers = 0;
|
753 | var quantizationTables = [];
|
754 | var huffmanTablesAC = [],
|
755 | huffmanTablesDC = [];
|
756 | var fileMarker = readUint16();
|
757 |
|
758 | if (fileMarker !== 0xFFD8) {
|
759 | throw new JpegError('SOI not found');
|
760 | }
|
761 |
|
762 | fileMarker = readUint16();
|
763 |
|
764 | markerLoop: while (fileMarker !== 0xFFD9) {
|
765 | var i, j, l;
|
766 |
|
767 | switch (fileMarker) {
|
768 | case 0xFFE0:
|
769 | case 0xFFE1:
|
770 | case 0xFFE2:
|
771 | case 0xFFE3:
|
772 | case 0xFFE4:
|
773 | case 0xFFE5:
|
774 | case 0xFFE6:
|
775 | case 0xFFE7:
|
776 | case 0xFFE8:
|
777 | case 0xFFE9:
|
778 | case 0xFFEA:
|
779 | case 0xFFEB:
|
780 | case 0xFFEC:
|
781 | case 0xFFED:
|
782 | case 0xFFEE:
|
783 | case 0xFFEF:
|
784 | case 0xFFFE:
|
785 | var appData = readDataBlock();
|
786 |
|
787 | if (fileMarker === 0xFFE0) {
|
788 | if (appData[0] === 0x4A && appData[1] === 0x46 && appData[2] === 0x49 && appData[3] === 0x46 && appData[4] === 0) {
|
789 | jfif = {
|
790 | version: {
|
791 | major: appData[5],
|
792 | minor: appData[6]
|
793 | },
|
794 | densityUnits: appData[7],
|
795 | xDensity: appData[8] << 8 | appData[9],
|
796 | yDensity: appData[10] << 8 | appData[11],
|
797 | thumbWidth: appData[12],
|
798 | thumbHeight: appData[13],
|
799 | thumbData: appData.subarray(14, 14 + 3 * appData[12] * appData[13])
|
800 | };
|
801 | }
|
802 | }
|
803 |
|
804 | if (fileMarker === 0xFFEE) {
|
805 | if (appData[0] === 0x41 && appData[1] === 0x64 && appData[2] === 0x6F && appData[3] === 0x62 && appData[4] === 0x65) {
|
806 | adobe = {
|
807 | version: appData[5] << 8 | appData[6],
|
808 | flags0: appData[7] << 8 | appData[8],
|
809 | flags1: appData[9] << 8 | appData[10],
|
810 | transformCode: appData[11]
|
811 | };
|
812 | }
|
813 | }
|
814 |
|
815 | break;
|
816 |
|
817 | case 0xFFDB:
|
818 | var quantizationTablesLength = readUint16();
|
819 | var quantizationTablesEnd = quantizationTablesLength + offset - 2;
|
820 | var z;
|
821 |
|
822 | while (offset < quantizationTablesEnd) {
|
823 | var quantizationTableSpec = data[offset++];
|
824 | var tableData = new Uint16Array(64);
|
825 |
|
826 | if (quantizationTableSpec >> 4 === 0) {
|
827 | for (j = 0; j < 64; j++) {
|
828 | z = dctZigZag[j];
|
829 | tableData[z] = data[offset++];
|
830 | }
|
831 | } else if (quantizationTableSpec >> 4 === 1) {
|
832 | for (j = 0; j < 64; j++) {
|
833 | z = dctZigZag[j];
|
834 | tableData[z] = readUint16();
|
835 | }
|
836 | } else {
|
837 | throw new JpegError('DQT - invalid table spec');
|
838 | }
|
839 |
|
840 | quantizationTables[quantizationTableSpec & 15] = tableData;
|
841 | }
|
842 |
|
843 | break;
|
844 |
|
845 | case 0xFFC0:
|
846 | case 0xFFC1:
|
847 | case 0xFFC2:
|
848 | if (frame) {
|
849 | throw new JpegError('Only single frame JPEGs supported');
|
850 | }
|
851 |
|
852 | readUint16();
|
853 | frame = {};
|
854 | frame.extended = fileMarker === 0xFFC1;
|
855 | frame.progressive = fileMarker === 0xFFC2;
|
856 | frame.precision = data[offset++];
|
857 | var sofScanLines = readUint16();
|
858 | frame.scanLines = dnlScanLines || sofScanLines;
|
859 | frame.samplesPerLine = readUint16();
|
860 | frame.components = [];
|
861 | frame.componentIds = {};
|
862 | var componentsCount = data[offset++],
|
863 | componentId;
|
864 | var maxH = 0,
|
865 | maxV = 0;
|
866 |
|
867 | for (i = 0; i < componentsCount; i++) {
|
868 | componentId = data[offset];
|
869 | var h = data[offset + 1] >> 4;
|
870 | var v = data[offset + 1] & 15;
|
871 |
|
872 | if (maxH < h) {
|
873 | maxH = h;
|
874 | }
|
875 |
|
876 | if (maxV < v) {
|
877 | maxV = v;
|
878 | }
|
879 |
|
880 | var qId = data[offset + 2];
|
881 | l = frame.components.push({
|
882 | h: h,
|
883 | v: v,
|
884 | quantizationId: qId,
|
885 | quantizationTable: null
|
886 | });
|
887 | frame.componentIds[componentId] = l - 1;
|
888 | offset += 3;
|
889 | }
|
890 |
|
891 | frame.maxH = maxH;
|
892 | frame.maxV = maxV;
|
893 | prepareComponents(frame);
|
894 | break;
|
895 |
|
896 | case 0xFFC4:
|
897 | var huffmanLength = readUint16();
|
898 |
|
899 | for (i = 2; i < huffmanLength;) {
|
900 | var huffmanTableSpec = data[offset++];
|
901 | var codeLengths = new Uint8Array(16);
|
902 | var codeLengthSum = 0;
|
903 |
|
904 | for (j = 0; j < 16; j++, offset++) {
|
905 | codeLengthSum += codeLengths[j] = data[offset];
|
906 | }
|
907 |
|
908 | var huffmanValues = new Uint8Array(codeLengthSum);
|
909 |
|
910 | for (j = 0; j < codeLengthSum; j++, offset++) {
|
911 | huffmanValues[j] = data[offset];
|
912 | }
|
913 |
|
914 | i += 17 + codeLengthSum;
|
915 | (huffmanTableSpec >> 4 === 0 ? huffmanTablesDC : huffmanTablesAC)[huffmanTableSpec & 15] = buildHuffmanTable(codeLengths, huffmanValues);
|
916 | }
|
917 |
|
918 | break;
|
919 |
|
920 | case 0xFFDD:
|
921 | readUint16();
|
922 | resetInterval = readUint16();
|
923 | break;
|
924 |
|
925 | case 0xFFDA:
|
926 | var parseDNLMarker = ++numSOSMarkers === 1 && !dnlScanLines;
|
927 | readUint16();
|
928 | var selectorsCount = data[offset++];
|
929 | var components = [],
|
930 | component;
|
931 |
|
932 | for (i = 0; i < selectorsCount; i++) {
|
933 | var componentIndex = frame.componentIds[data[offset++]];
|
934 | component = frame.components[componentIndex];
|
935 | var tableSpec = data[offset++];
|
936 | component.huffmanTableDC = huffmanTablesDC[tableSpec >> 4];
|
937 | component.huffmanTableAC = huffmanTablesAC[tableSpec & 15];
|
938 | components.push(component);
|
939 | }
|
940 |
|
941 | var spectralStart = data[offset++];
|
942 | var spectralEnd = data[offset++];
|
943 | var successiveApproximation = data[offset++];
|
944 |
|
945 | try {
|
946 | var processed = decodeScan(data, offset, frame, components, resetInterval, spectralStart, spectralEnd, successiveApproximation >> 4, successiveApproximation & 15, parseDNLMarker);
|
947 | offset += processed;
|
948 | } catch (ex) {
|
949 | if (ex instanceof DNLMarkerError) {
|
950 | (0, _util.warn)("".concat(ex.message, " -- attempting to re-parse the JPEG image."));
|
951 | return this.parse(data, {
|
952 | dnlScanLines: ex.scanLines
|
953 | });
|
954 | } else if (ex instanceof EOIMarkerError) {
|
955 | (0, _util.warn)("".concat(ex.message, " -- ignoring the rest of the image data."));
|
956 | break markerLoop;
|
957 | }
|
958 |
|
959 | throw ex;
|
960 | }
|
961 |
|
962 | break;
|
963 |
|
964 | case 0xFFDC:
|
965 | offset += 4;
|
966 | break;
|
967 |
|
968 | case 0xFFFF:
|
969 | if (data[offset] !== 0xFF) {
|
970 | offset--;
|
971 | }
|
972 |
|
973 | break;
|
974 |
|
975 | default:
|
976 | if (data[offset - 3] === 0xFF && data[offset - 2] >= 0xC0 && data[offset - 2] <= 0xFE) {
|
977 | offset -= 3;
|
978 | break;
|
979 | }
|
980 |
|
981 | var nextFileMarker = findNextFileMarker(data, offset - 2);
|
982 |
|
983 | if (nextFileMarker && nextFileMarker.invalid) {
|
984 | (0, _util.warn)('JpegImage.parse - unexpected data, current marker is: ' + nextFileMarker.invalid);
|
985 | offset = nextFileMarker.offset;
|
986 | break;
|
987 | }
|
988 |
|
989 | throw new JpegError('unknown marker ' + fileMarker.toString(16));
|
990 | }
|
991 |
|
992 | fileMarker = readUint16();
|
993 | }
|
994 |
|
995 | this.width = frame.samplesPerLine;
|
996 | this.height = frame.scanLines;
|
997 | this.jfif = jfif;
|
998 | this.adobe = adobe;
|
999 | this.components = [];
|
1000 |
|
1001 | for (i = 0; i < frame.components.length; i++) {
|
1002 | component = frame.components[i];
|
1003 | var quantizationTable = quantizationTables[component.quantizationId];
|
1004 |
|
1005 | if (quantizationTable) {
|
1006 | component.quantizationTable = quantizationTable;
|
1007 | }
|
1008 |
|
1009 | this.components.push({
|
1010 | output: buildComponentData(frame, component),
|
1011 | scaleX: component.h / frame.maxH,
|
1012 | scaleY: component.v / frame.maxV,
|
1013 | blocksPerLine: component.blocksPerLine,
|
1014 | blocksPerColumn: component.blocksPerColumn
|
1015 | });
|
1016 | }
|
1017 |
|
1018 | this.numComponents = this.components.length;
|
1019 | },
|
1020 | _getLinearizedBlockData: function _getLinearizedBlockData(width, height) {
|
1021 | var isSourcePDF = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
|
1022 | var scaleX = this.width / width,
|
1023 | scaleY = this.height / height;
|
1024 | var component, componentScaleX, componentScaleY, blocksPerScanline;
|
1025 | var x, y, i, j, k;
|
1026 | var index;
|
1027 | var offset = 0;
|
1028 | var output;
|
1029 | var numComponents = this.components.length;
|
1030 | var dataLength = width * height * numComponents;
|
1031 | var data = new Uint8ClampedArray(dataLength);
|
1032 | var xScaleBlockOffset = new Uint32Array(width);
|
1033 | var mask3LSB = 0xfffffff8;
|
1034 |
|
1035 | for (i = 0; i < numComponents; i++) {
|
1036 | component = this.components[i];
|
1037 | componentScaleX = component.scaleX * scaleX;
|
1038 | componentScaleY = component.scaleY * scaleY;
|
1039 | offset = i;
|
1040 | output = component.output;
|
1041 | blocksPerScanline = component.blocksPerLine + 1 << 3;
|
1042 |
|
1043 | for (x = 0; x < width; x++) {
|
1044 | j = 0 | x * componentScaleX;
|
1045 | xScaleBlockOffset[x] = (j & mask3LSB) << 3 | j & 7;
|
1046 | }
|
1047 |
|
1048 | for (y = 0; y < height; y++) {
|
1049 | j = 0 | y * componentScaleY;
|
1050 | index = blocksPerScanline * (j & mask3LSB) | (j & 7) << 3;
|
1051 |
|
1052 | for (x = 0; x < width; x++) {
|
1053 | data[offset] = output[index + xScaleBlockOffset[x]];
|
1054 | offset += numComponents;
|
1055 | }
|
1056 | }
|
1057 | }
|
1058 |
|
1059 | var transform = this._decodeTransform;
|
1060 |
|
1061 | if (!isSourcePDF && numComponents === 4 && !transform) {
|
1062 | transform = new Int32Array([-256, 255, -256, 255, -256, 255, -256, 255]);
|
1063 | }
|
1064 |
|
1065 | if (transform) {
|
1066 | for (i = 0; i < dataLength;) {
|
1067 | for (j = 0, k = 0; j < numComponents; j++, i++, k += 2) {
|
1068 | data[i] = (data[i] * transform[k] >> 8) + transform[k + 1];
|
1069 | }
|
1070 | }
|
1071 | }
|
1072 |
|
1073 | return data;
|
1074 | },
|
1075 |
|
1076 | get _isColorConversionNeeded() {
|
1077 | if (this.adobe) {
|
1078 | return !!this.adobe.transformCode;
|
1079 | }
|
1080 |
|
1081 | if (this.numComponents === 3) {
|
1082 | if (this._colorTransform === 0) {
|
1083 | return false;
|
1084 | }
|
1085 |
|
1086 | return true;
|
1087 | }
|
1088 |
|
1089 | if (this._colorTransform === 1) {
|
1090 | return true;
|
1091 | }
|
1092 |
|
1093 | return false;
|
1094 | },
|
1095 |
|
1096 | _convertYccToRgb: function convertYccToRgb(data) {
|
1097 | var Y, Cb, Cr;
|
1098 |
|
1099 | for (var i = 0, length = data.length; i < length; i += 3) {
|
1100 | Y = data[i];
|
1101 | Cb = data[i + 1];
|
1102 | Cr = data[i + 2];
|
1103 | data[i] = Y - 179.456 + 1.402 * Cr;
|
1104 | data[i + 1] = Y + 135.459 - 0.344 * Cb - 0.714 * Cr;
|
1105 | data[i + 2] = Y - 226.816 + 1.772 * Cb;
|
1106 | }
|
1107 |
|
1108 | return data;
|
1109 | },
|
1110 | _convertYcckToRgb: function convertYcckToRgb(data) {
|
1111 | var Y, Cb, Cr, k;
|
1112 | var offset = 0;
|
1113 |
|
1114 | for (var i = 0, length = data.length; i < length; i += 4) {
|
1115 | Y = data[i];
|
1116 | Cb = data[i + 1];
|
1117 | Cr = data[i + 2];
|
1118 | k = data[i + 3];
|
1119 | data[offset++] = -122.67195406894 + Cb * (-6.60635669420364e-5 * Cb + 0.000437130475926232 * Cr - 5.4080610064599e-5 * Y + 0.00048449797120281 * k - 0.154362151871126) + Cr * (-0.000957964378445773 * Cr + 0.000817076911346625 * Y - 0.00477271405408747 * k + 1.53380253221734) + Y * (0.000961250184130688 * Y - 0.00266257332283933 * k + 0.48357088451265) + k * (-0.000336197177618394 * k + 0.484791561490776);
|
1120 | data[offset++] = 107.268039397724 + Cb * (2.19927104525741e-5 * Cb - 0.000640992018297945 * Cr + 0.000659397001245577 * Y + 0.000426105652938837 * k - 0.176491792462875) + Cr * (-0.000778269941513683 * Cr + 0.00130872261408275 * Y + 0.000770482631801132 * k - 0.151051492775562) + Y * (0.00126935368114843 * Y - 0.00265090189010898 * k + 0.25802910206845) + k * (-0.000318913117588328 * k - 0.213742400323665);
|
1121 | data[offset++] = -20.810012546947 + Cb * (-0.000570115196973677 * Cb - 2.63409051004589e-5 * Cr + 0.0020741088115012 * Y - 0.00288260236853442 * k + 0.814272968359295) + Cr * (-1.53496057440975e-5 * Cr - 0.000132689043961446 * Y + 0.000560833691242812 * k - 0.195152027534049) + Y * (0.00174418132927582 * Y - 0.00255243321439347 * k + 0.116935020465145) + k * (-0.000343531996510555 * k + 0.24165260232407);
|
1122 | }
|
1123 |
|
1124 | return data.subarray(0, offset);
|
1125 | },
|
1126 | _convertYcckToCmyk: function convertYcckToCmyk(data) {
|
1127 | var Y, Cb, Cr;
|
1128 |
|
1129 | for (var i = 0, length = data.length; i < length; i += 4) {
|
1130 | Y = data[i];
|
1131 | Cb = data[i + 1];
|
1132 | Cr = data[i + 2];
|
1133 | data[i] = 434.456 - Y - 1.402 * Cr;
|
1134 | data[i + 1] = 119.541 - Y + 0.344 * Cb + 0.714 * Cr;
|
1135 | data[i + 2] = 481.816 - Y - 1.772 * Cb;
|
1136 | }
|
1137 |
|
1138 | return data;
|
1139 | },
|
1140 | _convertCmykToRgb: function convertCmykToRgb(data) {
|
1141 | var c, m, y, k;
|
1142 | var offset = 0;
|
1143 | var scale = 1 / 255;
|
1144 |
|
1145 | for (var i = 0, length = data.length; i < length; i += 4) {
|
1146 | c = data[i] * scale;
|
1147 | m = data[i + 1] * scale;
|
1148 | y = data[i + 2] * scale;
|
1149 | k = data[i + 3] * scale;
|
1150 | data[offset++] = 255 + c * (-4.387332384609988 * c + 54.48615194189176 * m + 18.82290502165302 * y + 212.25662451639585 * k - 285.2331026137004) + m * (1.7149763477362134 * m - 5.6096736904047315 * y - 17.873870861415444 * k - 5.497006427196366) + y * (-2.5217340131683033 * y - 21.248923337353073 * k + 17.5119270841813) - k * (21.86122147463605 * k + 189.48180835922747);
|
1151 | data[offset++] = 255 + c * (8.841041422036149 * c + 60.118027045597366 * m + 6.871425592049007 * y + 31.159100130055922 * k - 79.2970844816548) + m * (-15.310361306967817 * m + 17.575251261109482 * y + 131.35250912493976 * k - 190.9453302588951) + y * (4.444339102852739 * y + 9.8632861493405 * k - 24.86741582555878) - k * (20.737325471181034 * k + 187.80453709719578);
|
1152 | data[offset++] = 255 + c * (0.8842522430003296 * c + 8.078677503112928 * m + 30.89978309703729 * y - 0.23883238689178934 * k - 14.183576799673286) + m * (10.49593273432072 * m + 63.02378494754052 * y + 50.606957656360734 * k - 112.23884253719248) + y * (0.03296041114873217 * y + 115.60384449646641 * k - 193.58209356861505) - k * (22.33816807309886 * k + 180.12613974708367);
|
1153 | }
|
1154 |
|
1155 | return data.subarray(0, offset);
|
1156 | },
|
1157 | getData: function getData(_ref3) {
|
1158 | var width = _ref3.width,
|
1159 | height = _ref3.height,
|
1160 | _ref3$forceRGB = _ref3.forceRGB,
|
1161 | forceRGB = _ref3$forceRGB === void 0 ? false : _ref3$forceRGB,
|
1162 | _ref3$isSourcePDF = _ref3.isSourcePDF,
|
1163 | isSourcePDF = _ref3$isSourcePDF === void 0 ? false : _ref3$isSourcePDF;
|
1164 |
|
1165 | if (this.numComponents > 4) {
|
1166 | throw new JpegError('Unsupported color mode');
|
1167 | }
|
1168 |
|
1169 | var data = this._getLinearizedBlockData(width, height, isSourcePDF);
|
1170 |
|
1171 | if (this.numComponents === 1 && forceRGB) {
|
1172 | var dataLength = data.length;
|
1173 | var rgbData = new Uint8ClampedArray(dataLength * 3);
|
1174 | var offset = 0;
|
1175 |
|
1176 | for (var i = 0; i < dataLength; i++) {
|
1177 | var grayColor = data[i];
|
1178 | rgbData[offset++] = grayColor;
|
1179 | rgbData[offset++] = grayColor;
|
1180 | rgbData[offset++] = grayColor;
|
1181 | }
|
1182 |
|
1183 | return rgbData;
|
1184 | } else if (this.numComponents === 3 && this._isColorConversionNeeded) {
|
1185 | return this._convertYccToRgb(data);
|
1186 | } else if (this.numComponents === 4) {
|
1187 | if (this._isColorConversionNeeded) {
|
1188 | if (forceRGB) {
|
1189 | return this._convertYcckToRgb(data);
|
1190 | }
|
1191 |
|
1192 | return this._convertYcckToCmyk(data);
|
1193 | } else if (forceRGB) {
|
1194 | return this._convertCmykToRgb(data);
|
1195 | }
|
1196 | }
|
1197 |
|
1198 | return data;
|
1199 | }
|
1200 | };
|
1201 | return JpegImage;
|
1202 | }();
|
1203 |
|
1204 | exports.JpegImage = JpegImage; |
\ | No newline at end of file |