source: trunk/tools/qvfb/qanimationwriter.cpp@ 997

Last change on this file since 997 was 846, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 13.0 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
6**
7** This file is part of the tools applications of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at qt-info@nokia.com.
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include "qanimationwriter.h"
43#include <QFile>
44#include <QString>
45#include <QPainter>
46#include <png.h>
47#include <limits.h>
48#include <netinet/in.h> // for htonl
49
50#ifdef QT_LINUXBASE
51# include <arpa/inet.h> // for htonl (LSB only)
52#endif
53
54QT_BEGIN_NAMESPACE
55
56class QAnimationWriterData
57{
58public:
59 QAnimationWriterData(QIODevice* d) : framerate(1000), dev(d) {}
60 void setFrameRate(int d) { framerate = d; }
61 virtual ~QAnimationWriterData() { }
62 virtual void setImage(const QImage& src)=0;
63 virtual bool canCompose() const { return false; }
64 virtual void composeImage(const QImage&, const QPoint& ) {}
65
66protected:
67 int framerate;
68 QIODevice* dev;
69};
70
71
72class QAnimationWriterMNG : public QAnimationWriterData {
73 bool first;
74 png_structp png_ptr;
75 png_infop info_ptr;
76public:
77 QAnimationWriterMNG(QIODevice* d) : QAnimationWriterData(d)
78 {
79 first = true;
80 begin_png();
81 }
82
83 ~QAnimationWriterMNG()
84 {
85 if (first) {
86 // Eh? Not images.
87 QImage dummy(1,1,QImage::Format_RGB32);
88 setImage(dummy);
89 }
90 writeMEND();
91 end_png();
92 }
93
94 void begin_png()
95 {
96 png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,0,0,0);
97 info_ptr = png_create_info_struct(png_ptr);
98 png_set_compression_level(png_ptr,9);
99 png_set_write_fn(png_ptr, (void*)this, write, 0);
100 }
101
102 void end_png()
103 {
104 png_destroy_write_struct(&png_ptr, &info_ptr);
105 }
106
107 static void write( png_structp png_ptr, png_bytep data, png_size_t length)
108 {
109 QAnimationWriterMNG* that = (QAnimationWriterMNG*)png_get_io_ptr(png_ptr);
110 /*uint nw =*/ that->dev->write((const char*)data,length);
111 }
112
113 void writePNG(const QImage& image)
114 {
115#ifndef QT_LINUXBASE
116 // LSB disallows accessing the info_ptr directly. LSB's png_set_IHDR sets
117 // the channels anyways, so just comment it out for LSB usage
118 info_ptr->channels = 4;
119#endif
120 png_set_sig_bytes(png_ptr, 8); // Pretend we already wrote the sig
121 png_set_IHDR(png_ptr, info_ptr, image.width(), image.height(),
122 8, image.hasAlphaChannel()
123 ? PNG_COLOR_TYPE_RGB_ALPHA : PNG_COLOR_TYPE_RGB,
124 0, 0, 0);
125 png_write_info(png_ptr, info_ptr);
126 if (!image.hasAlphaChannel())
127 png_set_filler(png_ptr, 0,
128 QSysInfo::ByteOrder == QSysInfo::BigEndian ?
129 PNG_FILLER_BEFORE : PNG_FILLER_AFTER);
130 //if ( QImage::systemByteOrder() == QImage::BigEndian ) {
131 //png_set_swap_alpha(png_ptr);
132 //}
133 if (QSysInfo::ByteOrder == QSysInfo::LittleEndian) {
134 png_set_bgr(png_ptr);
135 }
136
137 int height = image.height();
138 png_bytep *row_pointers = new png_bytep[height];
139 for (int i = 0; i < height; ++i)
140 row_pointers[i] = (png_bytep)image.scanLine(i);
141 png_write_image(png_ptr, row_pointers);
142 delete [] row_pointers;
143 png_write_end(png_ptr, info_ptr);
144 end_png();
145 begin_png();
146 }
147
148 void writeMHDR(const QSize& size, int framerate)
149 {
150 dev->write("\212MNG\r\n\032\n", 8);
151
152 struct {
153 int width;
154 int height;
155 int framerate;
156 int a,b,c;
157 int profile;
158 } chunk;
159 chunk.width = htonl(size.width());
160 chunk.height = htonl(size.height());
161 chunk.framerate = htonl(framerate);
162 chunk.a=0;
163 chunk.b=0;
164 chunk.c=0;
165 chunk.profile = htonl(0x00000003);
166
167 png_write_chunk(png_ptr, (png_byte*)"MHDR", (png_byte*)&chunk, sizeof(chunk));
168 }
169
170 void writeMEND()
171 {
172 png_write_chunk(png_ptr, (png_byte*)"MEND", 0, 0);
173 }
174
175 void writeDEFI(const QPoint& offset, const QSize& /*size*/)
176 {
177 struct {
178 ushort o;
179 uchar s;
180 uchar concrete;
181 int x,y;
182 int lc,rc,tc,bc;
183 } chunk;
184 chunk.o=0;
185 chunk.s=0;
186 chunk.concrete=1;
187 chunk.x=htonl(offset.x());
188 chunk.y=htonl(offset.y());
189 chunk.lc=0;
190 chunk.rc=0;
191 chunk.tc=htonl(INT_MAX);
192 chunk.bc=htonl(INT_MAX);
193
194 png_write_chunk(png_ptr, (png_byte*)"DEFI", (png_byte*)&chunk, sizeof(chunk));
195 }
196
197 void writeFRAM(const QSize& size)
198 {
199 struct {
200 uchar mode;
201 uchar n;
202 uchar nu;
203 uchar d;
204 uchar t;
205 uchar clip;
206 uchar s;
207 uchar deltatype;
208 uint left;
209 uint right;
210 uint top;
211 uint bottom;
212 } chunk;
213 chunk.mode=1;
214 chunk.n='a';
215 chunk.nu=0;
216 chunk.d=0;
217 chunk.clip=1;
218 chunk.t=0;
219 chunk.s=0;
220 chunk.deltatype=0;
221 chunk.left=0;
222 chunk.right=htonl(size.width());
223 chunk.top=0;
224 chunk.bottom=htonl(size.height());
225
226 png_write_chunk(png_ptr, (png_byte*)"FRAM", (png_byte*)&chunk, sizeof(chunk));
227 }
228
229 void writeMOVE(const QPoint& offset)
230 {
231 struct {
232 uchar filler[3];
233 uchar z[5];
234 int x,y;
235 } chunk;
236 memset(chunk.z,0,5);
237 chunk.x=htonl(offset.x());
238 chunk.y=htonl(offset.y());
239
240 png_write_chunk(png_ptr, (png_byte*)"MOVE", ((png_byte*)&chunk)+3, sizeof(chunk)-3);
241 }
242
243 void setImage(const QImage& src)
244 {
245 if (first) {
246 first = false;
247 writeMHDR(src.size(),framerate);
248 }
249 composeImage(src,QPoint(0,0));
250 }
251
252 bool canCompose() const { return true; }
253
254 void composeImage(const QImage& src, const QPoint& offset)
255 {
256 writeMOVE(offset);
257 //writeFRAM(src.size());
258 writePNG(src);
259 }
260};
261
262QAnimationWriter::QAnimationWriter(const QString& filename, const char* format)
263{
264 if (qstrncmp(format, "MNG", 4)) {
265 qWarning("Format \"%s\" not supported, only MNG", format);
266 dev = 0;
267 d = 0;
268 } else {
269 QFile *f = new QFile(filename);
270 f->open(QIODevice::WriteOnly);
271 dev = f;
272 d = new QAnimationWriterMNG(dev);
273 }
274}
275
276bool QAnimationWriter::okay() const
277{
278 if (!dev)
279 return false;
280 QFile *file = qobject_cast<QFile*>(dev);
281 Q_ASSERT(file);
282 return (file->error() == QFile::NoError);
283}
284
285QAnimationWriter::~QAnimationWriter()
286{
287 delete d;
288 delete dev;
289}
290
291void QAnimationWriter::setFrameRate(int r)
292{
293 if (d)
294 d->setFrameRate(r);
295}
296
297void QAnimationWriter::appendFrame(const QImage& frm, const QPoint& offset)
298{
299 if (!dev)
300 return;
301
302 const QImage frame = frm.convertToFormat(QImage::Format_RGB32);
303 const int alignx = 1;
304 if (prev.isNull() || !d->canCompose()) {
305 d->setImage(frame);
306 } else {
307 bool done;
308 int minx, maxx, miny, maxy;
309 int w = frame.width();
310 int h = frame.height();
311
312 const quint32 *framePtr = reinterpret_cast<const quint32*>(frame.bits());
313 const quint32 *prevPtr = reinterpret_cast<const quint32*>(prev.bits());
314 const int frameStride = frame.bytesPerLine() / sizeof(quint32);
315 const int prevStride = prev.bytesPerLine() / sizeof(quint32);
316
317 // Find left edge of change
318 done = false;
319 for (minx = 0; minx < w && !done; ++minx) {
320 const quint32 *p1 = framePtr + minx;
321 const quint32 *p2 = prevPtr + minx + offset.x();
322 for (int y = 0; y < h; ++y) {
323 if (*p1 != *p2) {
324 done = true;
325 break;
326 }
327 p1 += frameStride;
328 p2 += prevStride;
329 }
330 }
331 --minx;
332
333 // Find right edge of change
334 done = false;
335 for (maxx = w-1; maxx >= 0 && !done; --maxx) {
336 const quint32 *p1 = framePtr + maxx;
337 const quint32 *p2 = prevPtr + maxx + offset.x();
338 for (int y = 0; y < h; ++y) {
339 if (*p1 != *p2) {
340 done = true;
341 break;
342 }
343 p1 += frameStride;
344 p2 += prevStride;
345 }
346 }
347 ++maxx;
348
349 // Find top edge of change
350 done = false;
351 for (miny = 0; miny < h && !done; ++miny) {
352 const quint32 *p1 = framePtr + miny * frameStride;
353 const quint32 *p2 = prevPtr + miny * prevStride + offset.x();
354 for (int x = 0; x < w; ++x) {
355 if (*p1 != *p2) {
356 done = true;
357 break;
358 }
359 ++p1;
360 ++p2;
361 }
362 }
363 --miny;
364
365 // Find right edge of change
366 done = false;
367 for (maxy = h-1; maxy >= 0 && !done; --maxy) {
368 const quint32 *p1 = framePtr + maxy * frameStride;
369 const quint32 *p2 = prevPtr + maxy * prevStride + offset.x();
370 for (int x = 0; x < w; ++x) {
371 if (*p1 != *p2) {
372 done = true;
373 break;
374 }
375 ++p1;
376 ++p2;
377 }
378 }
379 ++maxy;
380
381 if (minx > maxx)
382 minx = maxx = 0;
383 if (miny > maxy)
384 miny = maxy = 0;
385
386 if (alignx > 1) {
387 minx -= minx % alignx;
388 maxx = maxx - maxx % alignx + alignx - 1;
389 }
390
391 int dw = maxx - minx + 1;
392 int dh = maxy - miny + 1;
393
394 QImage diff(dw, dh, QImage::Format_ARGB32);
395
396 int x, y;
397 for (y = 0; y < dh; ++y) {
398 QRgb* li = (QRgb*)frame.scanLine(y+miny)+minx;
399 QRgb* lp = (QRgb*)prev.scanLine(y+miny+offset.y())+minx+offset.x();
400 QRgb* ld = (QRgb*)diff.scanLine(y);
401 if (alignx) {
402 for (x = 0; x < dw; x += alignx) {
403 int i;
404 for (i = 0; i < alignx; ++i) {
405 if (li[x+i] != lp[x+i])
406 break;
407 }
408 if (i == alignx) {
409 // All the same
410 for (i = 0; i < alignx; ++i)
411 ld[x+i] = qRgba(0,0,0,0);
412 } else {
413 // Some different
414 for (i = 0; i < alignx; ++i)
415 ld[x+i] = 0xff000000 | li[x+i];
416 }
417 }
418 } else {
419 for (x = 0; x < dw; ++x) {
420 if (li[x] != lp[x])
421 ld[x] = 0xff000000 | li[x];
422 else
423 ld[x] = qRgba(0,0,0,0);
424 }
425 }
426 }
427
428 d->composeImage(diff, QPoint(minx, miny) + offset);
429 }
430 if (prev.isNull() || (prev.size() == frame.size() && offset == QPoint(0,0))) {
431 prev = frame;
432 } else {
433 QPainter p(&prev);
434 p.drawImage(offset.x(), offset.y(), frame, 0, 0,
435 frame.width(), frame.height());
436 }
437}
438
439void QAnimationWriter::appendFrame(const QImage& frm)
440{
441 appendFrame(frm, QPoint(0,0));
442}
443
444void QAnimationWriter::appendBlankFrame()
445{
446 QImage i(1,1,QImage::Format_ARGB32);
447 i.fill(0);
448 d->composeImage(i, QPoint(0,0));
449}
450
451QT_END_NAMESPACE
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