qppmhandler.cpp

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1/****************************************************************************-
2**-
3** Copyright (C) 2016 The Qt Company Ltd.-
4** Contact: https://www.qt.io/licensing/-
5**-
6** This file is part of the QtGui module of the Qt Toolkit.-
7**-
8** $QT_BEGIN_LICENSE:LGPL$-
9** Commercial License Usage-
10** Licensees holding valid commercial Qt licenses may use this file in-
11** accordance with the commercial license agreement provided with the-
12** Software or, alternatively, in accordance with the terms contained in-
13** a written agreement between you and The Qt Company. For licensing terms-
14** and conditions see https://www.qt.io/terms-conditions. For further-
15** information use the contact form at https://www.qt.io/contact-us.-
16**-
17** GNU Lesser General Public License Usage-
18** Alternatively, this file may be used under the terms of the GNU Lesser-
19** General Public License version 3 as published by the Free Software-
20** Foundation and appearing in the file LICENSE.LGPL3 included in the-
21** packaging of this file. Please review the following information to-
22** ensure the GNU Lesser General Public License version 3 requirements-
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.-
24**-
25** GNU General Public License Usage-
26** Alternatively, this file may be used under the terms of the GNU-
27** General Public License version 2.0 or (at your option) the GNU General-
28** Public license version 3 or any later version approved by the KDE Free-
29** Qt Foundation. The licenses are as published by the Free Software-
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3-
31** included in the packaging of this file. Please review the following-
32** information to ensure the GNU General Public License requirements will-
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and-
34** https://www.gnu.org/licenses/gpl-3.0.html.-
35**-
36** $QT_END_LICENSE$-
37**-
38****************************************************************************/-
39-
40#include "private/qppmhandler_p.h"-
41-
42#ifndef QT_NO_IMAGEFORMAT_PPM-
43-
44#include <qimage.h>-
45#include <qvariant.h>-
46#include <qvector.h>-
47#include <ctype.h>-
48-
49QT_BEGIN_NAMESPACE-
50-
51/*****************************************************************************-
52 PBM/PGM/PPM (ASCII and RAW) image read/write functions-
53 *****************************************************************************/-
54-
55static void discard_pbm_line(QIODevice *d)-
56{-
57 const int buflen = 100;-
58 char buf[buflen];-
59 int res = 0;-
60 do {-
61 res = d->readLine(buf, buflen);-
62 } while (res > 0 && buf[res-1] != '\n');-
63}-
64-
65static int read_pbm_int(QIODevice *d)-
66{-
67 char c;-
68 int val = -1;-
69 bool digit;-
70 for (;;) {-
71 if (!d->getChar(&c)) // end of file-
72 break;-
73 digit = isdigit((uchar) c);-
74 if (val != -1) {-
75 if (digit) {-
76 val = 10*val + c - '0';-
77 continue;-
78 } else {-
79 if (c == '#') // comment-
80 discard_pbm_line(d);-
81 break;-
82 }-
83 }-
84 if (digit) // first digit-
85 val = c - '0';-
86 else if (isspace((uchar) c))-
87 continue;-
88 else if (c == '#')-
89 discard_pbm_line(d);-
90 else-
91 break;-
92 }-
93 return val;-
94}-
95-
96static bool read_pbm_header(QIODevice *device, char& type, int& w, int& h, int& mcc)-
97{-
98 char buf[3];-
99 if (device->read(buf, 3) != 3) // read P[1-6]<white-space>
device->read(buf, 3) != 3Description
TRUEnever evaluated
FALSEnever evaluated
0
100 return false;
never executed: return false;
0
101-
102 if (!(buf[0] == 'P' && isdigit((uchar) buf[1]) && isspace((uchar) buf[2])))
buf[0] == 'P'Description
TRUEnever evaluated
FALSEnever evaluated
isdigit((uchar) buf[1])Description
TRUEnever evaluated
FALSEnever evaluated
isspace((uchar) buf[2])Description
TRUEnever evaluated
FALSEnever evaluated
0
103 return false;
never executed: return false;
0
104-
105 type = buf[1];-
106 if (type < '1' || type > '6')
type < '1'Description
TRUEnever evaluated
FALSEnever evaluated
type > '6'Description
TRUEnever evaluated
FALSEnever evaluated
0
107 return false;
never executed: return false;
0
108-
109 w = read_pbm_int(device); // get image width-
110 h = read_pbm_int(device); // get image height-
111-
112 if (type == '1' || type == '4')
type == '1'Description
TRUEnever evaluated
FALSEnever evaluated
type == '4'Description
TRUEnever evaluated
FALSEnever evaluated
0
113 mcc = 1; // ignore max color component
never executed: mcc = 1;
0
114 else-
115 mcc = read_pbm_int(device); // get max color component
never executed: mcc = read_pbm_int(device);
0
116-
117 if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0|| mcc > 0xffff)
w <= 0Description
TRUEnever evaluated
FALSEnever evaluated
w > 32767Description
TRUEnever evaluated
FALSEnever evaluated
h <= 0Description
TRUEnever evaluated
FALSEnever evaluated
h > 32767Description
TRUEnever evaluated
FALSEnever evaluated
mcc <= 0Description
TRUEnever evaluated
FALSEnever evaluated
0
118 return false; // weird P.M image
never executed: return false;
0
119-
120 return true;
never executed: return true;
0
121}-
122-
123static bool read_pbm_body(QIODevice *device, char type, int w, int h, int mcc, QImage *outImage)-
124{-
125 int nbits, y;-
126 int pbm_bpl;-
127 bool raw;-
128-
129 QImage::Format format;-
130 switch (type) {-
131 case '1': // ascii PBM-
132 case '4': // raw PBM-
133 nbits = 1;-
134 format = QImage::Format_Mono;-
135 break;-
136 case '2': // ascii PGM-
137 case '5': // raw PGM-
138 nbits = 8;-
139 format = QImage::Format_Grayscale8;-
140 break;-
141 case '3': // ascii PPM-
142 case '6': // raw PPM-
143 nbits = 32;-
144 format = QImage::Format_RGB32;-
145 break;-
146 default:-
147 return false;-
148 }-
149 raw = type >= '4';-
150-
151 int maxc = mcc;-
152 if (maxc > 255)-
153 maxc = 255;-
154 if (outImage->size() != QSize(w, h) || outImage->format() != format) {-
155 *outImage = QImage(w, h, format);-
156 if (outImage->isNull())-
157 return false;-
158 }-
159-
160 pbm_bpl = (nbits*w+7)/8; // bytes per scanline in PBM-
161-
162 if (raw) { // read raw data-
163 if (nbits == 32) { // type 6-
164 pbm_bpl = mcc < 256 ? 3*w : 6*w;-
165 uchar *buf24 = new uchar[pbm_bpl], *b;-
166 QRgb *p;-
167 QRgb *end;-
168 for (y=0; y<h; y++) {-
169 if (device->read((char *)buf24, pbm_bpl) != pbm_bpl) {-
170 delete[] buf24;-
171 return false;-
172 }-
173 p = (QRgb *)outImage->scanLine(y);-
174 end = p + w;-
175 b = buf24;-
176 while (p < end) {-
177 if (mcc < 256) {-
178 *p++ = qRgb(b[0],b[1],b[2]);-
179 b += 3;-
180 } else {-
181 *p++ = qRgb(((int(b[0]) * 256 + int(b[1]) + 1) * 256) / (mcc + 1) - 1,-
182 ((int(b[2]) * 256 + int(b[3]) + 1) * 256) / (mcc + 1) - 1,-
183 ((int(b[4]) * 256 + int(b[5]) + 1) * 256) / (mcc + 1) - 1);-
184 b += 6;-
185 }-
186 }-
187 }-
188 delete[] buf24;-
189 } else { // type 4,5-
190 for (y=0; y<h; y++) {-
191 if (device->read((char *)outImage->scanLine(y), pbm_bpl)-
192 != pbm_bpl)-
193 return false;-
194 }-
195 }-
196 } else { // read ascii data-
197 uchar *p;-
198 int n;-
199 char buf;-
200 for (y = 0; (y < h) && (device->peek(&buf, 1) == 1); y++) {-
201 p = outImage->scanLine(y);-
202 n = pbm_bpl;-
203 if (nbits == 1) {-
204 int b;-
205 int bitsLeft = w;-
206 while (n--) {-
207 b = 0;-
208 for (int i=0; i<8; i++) {-
209 if (i < bitsLeft)-
210 b = (b << 1) | (read_pbm_int(device) & 1);-
211 else-
212 b = (b << 1) | (0 & 1); // pad it our self if we need to-
213 }-
214 bitsLeft -= 8;-
215 *p++ = b;-
216 }-
217 } else if (nbits == 8) {-
218 if (mcc == 255) {-
219 while (n--) {-
220 *p++ = read_pbm_int(device);-
221 }-
222 } else {-
223 while (n--) {-
224 *p++ = read_pbm_int(device) * 255 / mcc;-
225 }-
226 }-
227 } else { // 32 bits-
228 n /= 4;-
229 int r, g, b;-
230 if (mcc == maxc) {-
231 while (n--) {-
232 r = read_pbm_int(device);-
233 g = read_pbm_int(device);-
234 b = read_pbm_int(device);-
235 *((QRgb*)p) = qRgb(r, g, b);-
236 p += 4;-
237 }-
238 } else {-
239 while (n--) {-
240 r = read_pbm_int(device) * maxc / mcc;-
241 g = read_pbm_int(device) * maxc / mcc;-
242 b = read_pbm_int(device) * maxc / mcc;-
243 *((QRgb*)p) = qRgb(r, g, b);-
244 p += 4;-
245 }-
246 }-
247 }-
248 }-
249 }-
250-
251 if (format == QImage::Format_Mono) {-
252 outImage->setColorCount(2);-
253 outImage->setColor(0, qRgb(255,255,255)); // white-
254 outImage->setColor(1, qRgb(0,0,0)); // black-
255 }-
256-
257 return true;-
258}-
259-
260static bool write_pbm_image(QIODevice *out, const QImage &sourceImage, const QByteArray &sourceFormat)-
261{-
262 QByteArray str;-
263 QImage image = sourceImage;-
264 QByteArray format = sourceFormat;-
265-
266 format = format.left(3); // ignore RAW part-
267 bool gray = format == "pgm";-
268-
269 if (format == "pbm") {-
270 image = image.convertToFormat(QImage::Format_Mono);-
271 } else if (gray) {-
272 image = image.convertToFormat(QImage::Format_Grayscale8);-
273 } else {-
274 switch (image.format()) {-
275 case QImage::Format_Mono:-
276 case QImage::Format_MonoLSB:-
277 image = image.convertToFormat(QImage::Format_Indexed8);-
278 break;-
279 case QImage::Format_Indexed8:-
280 case QImage::Format_RGB32:-
281 case QImage::Format_ARGB32:-
282 break;-
283 default:-
284 if (image.hasAlphaChannel())-
285 image = image.convertToFormat(QImage::Format_ARGB32);-
286 else-
287 image = image.convertToFormat(QImage::Format_RGB32);-
288 break;-
289 }-
290 }-
291-
292 if (image.depth() == 1 && image.colorCount() == 2) {-
293 if (qGray(image.color(0)) < qGray(image.color(1))) {-
294 // 0=dark/black, 1=light/white - invert-
295 image.detach();-
296 for (int y=0; y<image.height(); y++) {-
297 uchar *p = image.scanLine(y);-
298 uchar *end = p + image.bytesPerLine();-
299 while (p < end)-
300 *p++ ^= 0xff;-
301 }-
302 }-
303 }-
304-
305 uint w = image.width();-
306 uint h = image.height();-
307-
308 str = "P\n";-
309 str += QByteArray::number(w);-
310 str += ' ';-
311 str += QByteArray::number(h);-
312 str += '\n';-
313-
314 switch (image.depth()) {-
315 case 1: {-
316 str.insert(1, '4');-
317 if (out->write(str, str.length()) != str.length())-
318 return false;-
319 w = (w+7)/8;-
320 for (uint y=0; y<h; y++) {-
321 uchar* line = image.scanLine(y);-
322 if (w != (uint)out->write((char*)line, w))-
323 return false;-
324 }-
325 }-
326 break;-
327-
328 case 8: {-
329 str.insert(1, gray ? '5' : '6');-
330 str.append("255\n");-
331 if (out->write(str, str.length()) != str.length())-
332 return false;-
333 uint bpl = w * (gray ? 1 : 3);-
334 uchar *buf = new uchar[bpl];-
335 if (image.format() == QImage::Format_Indexed8) {-
336 QVector<QRgb> color = image.colorTable();-
337 for (uint y=0; y<h; y++) {-
338 const uchar *b = image.constScanLine(y);-
339 uchar *p = buf;-
340 uchar *end = buf+bpl;-
341 if (gray) {-
342 while (p < end) {-
343 uchar g = (uchar)qGray(color[*b++]);-
344 *p++ = g;-
345 }-
346 } else {-
347 while (p < end) {-
348 QRgb rgb = color[*b++];-
349 *p++ = qRed(rgb);-
350 *p++ = qGreen(rgb);-
351 *p++ = qBlue(rgb);-
352 }-
353 }-
354 if (bpl != (uint)out->write((char*)buf, bpl))-
355 return false;-
356 }-
357 } else {-
358 for (uint y=0; y<h; y++) {-
359 const uchar *b = image.constScanLine(y);-
360 uchar *p = buf;-
361 uchar *end = buf + bpl;-
362 if (gray) {-
363 while (p < end)-
364 *p++ = *b++;-
365 } else {-
366 while (p < end) {-
367 uchar color = *b++;-
368 *p++ = color;-
369 *p++ = color;-
370 *p++ = color;-
371 }-
372 }-
373 if (bpl != (uint)out->write((char*)buf, bpl))-
374 return false;-
375 }-
376 }-
377 delete [] buf;-
378 break;-
379 }-
380-
381 case 32: {-
382 str.insert(1, '6');-
383 str.append("255\n");-
384 if (out->write(str, str.length()) != str.length())-
385 return false;-
386 uint bpl = w * 3;-
387 uchar *buf = new uchar[bpl];-
388 for (uint y=0; y<h; y++) {-
389 const QRgb *b = reinterpret_cast<const QRgb *>(image.constScanLine(y));-
390 uchar *p = buf;-
391 uchar *end = buf+bpl;-
392 while (p < end) {-
393 QRgb rgb = *b++;-
394 *p++ = qRed(rgb);-
395 *p++ = qGreen(rgb);-
396 *p++ = qBlue(rgb);-
397 }-
398 if (bpl != (uint)out->write((char*)buf, bpl))-
399 return false;-
400 }-
401 delete [] buf;-
402 break;-
403 }-
404-
405 default:-
406 return false;-
407 }-
408-
409 return true;-
410}-
411-
412QPpmHandler::QPpmHandler()-
413 : state(Ready)-
414{-
415}-
416-
417bool QPpmHandler::readHeader()-
418{-
419 state = Error;-
420 if (!read_pbm_header(device(), type, width, height, mcc))-
421 return false;-
422 state = ReadHeader;-
423 return true;-
424}-
425-
426bool QPpmHandler::canRead() const-
427{-
428 if (state == Ready && !canRead(device(), &subType))-
429 return false;-
430-
431 if (state != Error) {-
432 setFormat(subType);-
433 return true;-
434 }-
435-
436 return false;-
437}-
438-
439bool QPpmHandler::canRead(QIODevice *device, QByteArray *subType)-
440{-
441 if (!device) {-
442 qWarning("QPpmHandler::canRead() called with no device");-
443 return false;-
444 }-
445-
446 char head[2];-
447 if (device->peek(head, sizeof(head)) != sizeof(head))-
448 return false;-
449-
450 if (head[0] != 'P')-
451 return false;-
452-
453 if (head[1] == '1' || head[1] == '4') {-
454 if (subType)-
455 *subType = "pbm";-
456 } else if (head[1] == '2' || head[1] == '5') {-
457 if (subType)-
458 *subType = "pgm";-
459 } else if (head[1] == '3' || head[1] == '6') {-
460 if (subType)-
461 *subType = "ppm";-
462 } else {-
463 return false;-
464 }-
465 return true;-
466}-
467-
468bool QPpmHandler::read(QImage *image)-
469{-
470 if (state == Error)-
471 return false;-
472-
473 if (state == Ready && !readHeader()) {-
474 state = Error;-
475 return false;-
476 }-
477-
478 if (!read_pbm_body(device(), type, width, height, mcc, image)) {-
479 state = Error;-
480 return false;-
481 }-
482-
483 state = Ready;-
484 return true;-
485}-
486-
487bool QPpmHandler::write(const QImage &image)-
488{-
489 return write_pbm_image(device(), image, subType);-
490}-
491-
492bool QPpmHandler::supportsOption(ImageOption option) const-
493{-
494 return option == SubType-
495 || option == Size-
496 || option == ImageFormat;-
497}-
498-
499QVariant QPpmHandler::option(ImageOption option) const-
500{-
501 if (option == SubType) {-
502 return subType;-
503 } else if (option == Size) {-
504 if (state == Error)-
505 return QVariant();-
506 if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader())-
507 return QVariant();-
508 return QSize(width, height);-
509 } else if (option == ImageFormat) {-
510 if (state == Error)-
511 return QVariant();-
512 if (state == Ready && !const_cast<QPpmHandler*>(this)->readHeader())-
513 return QVariant();-
514 QImage::Format format = QImage::Format_Invalid;-
515 switch (type) {-
516 case '1': // ascii PBM-
517 case '4': // raw PBM-
518 format = QImage::Format_Mono;-
519 break;-
520 case '2': // ascii PGM-
521 case '5': // raw PGM-
522 format = QImage::Format_Grayscale8;-
523 break;-
524 case '3': // ascii PPM-
525 case '6': // raw PPM-
526 format = QImage::Format_RGB32;-
527 break;-
528 default:-
529 break;-
530 }-
531 return format;-
532 }-
533 return QVariant();-
534}-
535-
536void QPpmHandler::setOption(ImageOption option, const QVariant &value)-
537{-
538 if (option == SubType)-
539 subType = value.toByteArray().toLower();-
540}-
541-
542QByteArray QPpmHandler::name() const-
543{-
544 return subType.isEmpty() ? QByteArray("ppm") : subType;-
545}-
546-
547QT_END_NAMESPACE-
548-
549#endif // QT_NO_IMAGEFORMAT_PPM-
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