source: trunk/demos/composition/composition.cpp@ 561

Last change on this file since 561 was 561, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.6.1 sources.
File size: 19.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 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 demonstration 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 "composition.h"
43#include <QBoxLayout>
44#include <QRadioButton>
45#include <QTimer>
46#include <QDateTime>
47#include <QSlider>
48#include <QMouseEvent>
49#include <qmath.h>
50
51CompositionWidget::CompositionWidget(QWidget *parent)
52 : QWidget(parent)
53{
54 CompositionRenderer *view = new CompositionRenderer(this);
55
56 QGroupBox *mainGroup = new QGroupBox(parent);
57 mainGroup->setTitle(tr("Composition Modes"));
58
59 QGroupBox *modesGroup = new QGroupBox(mainGroup);
60 modesGroup->setTitle(tr("Mode"));
61
62 rbClear = new QRadioButton(tr("Clear"), modesGroup);
63 connect(rbClear, SIGNAL(clicked()), view, SLOT(setClearMode()));
64 rbSource = new QRadioButton(tr("Source"), modesGroup);
65 connect(rbSource, SIGNAL(clicked()), view, SLOT(setSourceMode()));
66 rbDest = new QRadioButton(tr("Destination"), modesGroup);
67 connect(rbDest, SIGNAL(clicked()), view, SLOT(setDestMode()));
68 rbSourceOver = new QRadioButton(tr("Source Over"), modesGroup);
69 connect(rbSourceOver, SIGNAL(clicked()), view, SLOT(setSourceOverMode()));
70 rbDestOver = new QRadioButton(tr("Destination Over"), modesGroup);
71 connect(rbDestOver, SIGNAL(clicked()), view, SLOT(setDestOverMode()));
72 rbSourceIn = new QRadioButton(tr("Source In"), modesGroup);
73 connect(rbSourceIn, SIGNAL(clicked()), view, SLOT(setSourceInMode()));
74 rbDestIn = new QRadioButton(tr("Dest In"), modesGroup);
75 connect(rbDestIn, SIGNAL(clicked()), view, SLOT(setDestInMode()));
76 rbSourceOut = new QRadioButton(tr("Source Out"), modesGroup);
77 connect(rbSourceOut, SIGNAL(clicked()), view, SLOT(setSourceOutMode()));
78 rbDestOut = new QRadioButton(tr("Dest Out"), modesGroup);
79 connect(rbDestOut, SIGNAL(clicked()), view, SLOT(setDestOutMode()));
80 rbSourceAtop = new QRadioButton(tr("Source Atop"), modesGroup);
81 connect(rbSourceAtop, SIGNAL(clicked()), view, SLOT(setSourceAtopMode()));
82 rbDestAtop = new QRadioButton(tr("Dest Atop"), modesGroup);
83 connect(rbDestAtop, SIGNAL(clicked()), view, SLOT(setDestAtopMode()));
84 rbXor = new QRadioButton(tr("Xor"), modesGroup);
85 connect(rbXor, SIGNAL(clicked()), view, SLOT(setXorMode()));
86
87 rbPlus = new QRadioButton(tr("Plus"), modesGroup);
88 connect(rbPlus, SIGNAL(clicked()), view, SLOT(setPlusMode()));
89 rbMultiply = new QRadioButton(tr("Multiply"), modesGroup);
90 connect(rbMultiply, SIGNAL(clicked()), view, SLOT(setMultiplyMode()));
91 rbScreen = new QRadioButton(tr("Screen"), modesGroup);
92 connect(rbScreen, SIGNAL(clicked()), view, SLOT(setScreenMode()));
93 rbOverlay = new QRadioButton(tr("Overlay"), modesGroup);
94 connect(rbOverlay, SIGNAL(clicked()), view, SLOT(setOverlayMode()));
95 rbDarken = new QRadioButton(tr("Darken"), modesGroup);
96 connect(rbDarken, SIGNAL(clicked()), view, SLOT(setDarkenMode()));
97 rbLighten = new QRadioButton(tr("Lighten"), modesGroup);
98 connect(rbLighten, SIGNAL(clicked()), view, SLOT(setLightenMode()));
99 rbColorDodge = new QRadioButton(tr("Color Dodge"), modesGroup);
100 connect(rbColorDodge, SIGNAL(clicked()), view, SLOT(setColorDodgeMode()));
101 rbColorBurn = new QRadioButton(tr("Color Burn"), modesGroup);
102 connect(rbColorBurn, SIGNAL(clicked()), view, SLOT(setColorBurnMode()));
103 rbHardLight = new QRadioButton(tr("Hard Light"), modesGroup);
104 connect(rbHardLight, SIGNAL(clicked()), view, SLOT(setHardLightMode()));
105 rbSoftLight = new QRadioButton(tr("Soft Light"), modesGroup);
106 connect(rbSoftLight, SIGNAL(clicked()), view, SLOT(setSoftLightMode()));
107 rbDifference = new QRadioButton(tr("Difference"), modesGroup);
108 connect(rbDifference, SIGNAL(clicked()), view, SLOT(setDifferenceMode()));
109 rbExclusion = new QRadioButton(tr("Exclusion"), modesGroup);
110 connect(rbExclusion, SIGNAL(clicked()), view, SLOT(setExclusionMode()));
111
112 QGroupBox *circleColorGroup = new QGroupBox(mainGroup);
113 circleColorGroup->setTitle(tr("Circle color"));
114 QSlider *circleColorSlider = new QSlider(Qt::Horizontal, circleColorGroup);
115 circleColorSlider->setRange(0, 359);
116 circleColorSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
117 connect(circleColorSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleColor(int)));
118
119 QGroupBox *circleAlphaGroup = new QGroupBox(mainGroup);
120 circleAlphaGroup->setTitle(tr("Circle alpha"));
121 QSlider *circleAlphaSlider = new QSlider(Qt::Horizontal, circleAlphaGroup);
122 circleAlphaSlider->setRange(0, 255);
123 circleAlphaSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
124 connect(circleAlphaSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleAlpha(int)));
125
126 QPushButton *showSourceButton = new QPushButton(mainGroup);
127 showSourceButton->setText(tr("Show Source"));
128#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
129 QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
130 enableOpenGLButton->setText(tr("Use OpenGL"));
131 enableOpenGLButton->setCheckable(true);
132 enableOpenGLButton->setChecked(view->usesOpenGL());
133
134 if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers())
135 enableOpenGLButton->hide();
136#endif
137 QPushButton *whatsThisButton = new QPushButton(mainGroup);
138 whatsThisButton->setText(tr("What's This?"));
139 whatsThisButton->setCheckable(true);
140
141 QPushButton *animateButton = new QPushButton(mainGroup);
142 animateButton->setText(tr("Animated"));
143 animateButton->setCheckable(true);
144 animateButton->setChecked(true);
145
146 QHBoxLayout *viewLayout = new QHBoxLayout(this);
147 viewLayout->addWidget(view);
148 viewLayout->addWidget(mainGroup);
149
150 QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
151 mainGroupLayout->addWidget(circleColorGroup);
152 mainGroupLayout->addWidget(circleAlphaGroup);
153 mainGroupLayout->addWidget(modesGroup);
154 mainGroupLayout->addStretch();
155 mainGroupLayout->addWidget(animateButton);
156 mainGroupLayout->addWidget(whatsThisButton);
157 mainGroupLayout->addWidget(showSourceButton);
158#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
159 mainGroupLayout->addWidget(enableOpenGLButton);
160#endif
161
162 QGridLayout *modesLayout = new QGridLayout(modesGroup);
163 modesLayout->addWidget(rbClear, 0, 0);
164 modesLayout->addWidget(rbSource, 1, 0);
165 modesLayout->addWidget(rbDest, 2, 0);
166 modesLayout->addWidget(rbSourceOver, 3, 0);
167 modesLayout->addWidget(rbDestOver, 4, 0);
168 modesLayout->addWidget(rbSourceIn, 5, 0);
169 modesLayout->addWidget(rbDestIn, 6, 0);
170 modesLayout->addWidget(rbSourceOut, 7, 0);
171 modesLayout->addWidget(rbDestOut, 8, 0);
172 modesLayout->addWidget(rbSourceAtop, 9, 0);
173 modesLayout->addWidget(rbDestAtop, 10, 0);
174 modesLayout->addWidget(rbXor, 11, 0);
175
176 modesLayout->addWidget(rbPlus, 0, 1);
177 modesLayout->addWidget(rbMultiply, 1, 1);
178 modesLayout->addWidget(rbScreen, 2, 1);
179 modesLayout->addWidget(rbOverlay, 3, 1);
180 modesLayout->addWidget(rbDarken, 4, 1);
181 modesLayout->addWidget(rbLighten, 5, 1);
182 modesLayout->addWidget(rbColorDodge, 6, 1);
183 modesLayout->addWidget(rbColorBurn, 7, 1);
184 modesLayout->addWidget(rbHardLight, 8, 1);
185 modesLayout->addWidget(rbSoftLight, 9, 1);
186 modesLayout->addWidget(rbDifference, 10, 1);
187 modesLayout->addWidget(rbExclusion, 11, 1);
188
189
190 QVBoxLayout *circleColorLayout = new QVBoxLayout(circleColorGroup);
191 circleColorLayout->addWidget(circleColorSlider);
192
193 QVBoxLayout *circleAlphaLayout = new QVBoxLayout(circleAlphaGroup);
194 circleAlphaLayout->addWidget(circleAlphaSlider);
195
196 view->loadDescription(":res/composition/composition.html");
197 view->loadSourceFile(":res/composition/composition.cpp");
198
199 connect(whatsThisButton, SIGNAL(clicked(bool)), view, SLOT(setDescriptionEnabled(bool)));
200 connect(view, SIGNAL(descriptionEnabledChanged(bool)), whatsThisButton, SLOT(setChecked(bool)));
201 connect(showSourceButton, SIGNAL(clicked()), view, SLOT(showSource()));
202#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
203 connect(enableOpenGLButton, SIGNAL(clicked(bool)), view, SLOT(enableOpenGL(bool)));
204#endif
205 connect(animateButton, SIGNAL(toggled(bool)), view, SLOT(setAnimationEnabled(bool)));
206
207 circleColorSlider->setValue(270);
208 circleAlphaSlider->setValue(200);
209 rbSourceOut->animateClick();
210
211 setWindowTitle(tr("Composition Modes"));
212}
213
214
215void CompositionWidget::nextMode()
216{
217 /*
218 if (!m_animation_enabled)
219 return;
220 if (rbClear->isChecked()) rbSource->animateClick();
221 if (rbSource->isChecked()) rbDest->animateClick();
222 if (rbDest->isChecked()) rbSourceOver->animateClick();
223 if (rbSourceOver->isChecked()) rbDestOver->animateClick();
224 if (rbDestOver->isChecked()) rbSourceIn->animateClick();
225 if (rbSourceIn->isChecked()) rbDestIn->animateClick();
226 if (rbDestIn->isChecked()) rbSourceOut->animateClick();
227 if (rbSourceOut->isChecked()) rbDestOut->animateClick();
228 if (rbDestOut->isChecked()) rbSourceAtop->animateClick();
229 if (rbSourceAtop->isChecked()) rbDestAtop->animateClick();
230 if (rbDestAtop->isChecked()) rbXor->animateClick();
231 if (rbXor->isChecked()) rbClear->animateClick();
232 */
233}
234
235CompositionRenderer::CompositionRenderer(QWidget *parent)
236 : ArthurFrame(parent)
237{
238 m_animation_enabled = true;
239#ifdef Q_WS_QWS
240 m_image = QPixmap(":res/composition/flower.jpg");
241 m_image.setAlphaChannel(QPixmap(":res/composition/flower_alpha.jpg"));
242#else
243 m_image = QImage(":res/composition/flower.jpg");
244 m_image.setAlphaChannel(QImage(":res/composition/flower_alpha.jpg"));
245#endif
246 m_circle_alpha = 127;
247 m_circle_hue = 255;
248 m_current_object = NoObject;
249 m_composition_mode = QPainter::CompositionMode_SourceOut;
250
251 m_circle_pos = QPoint(200, 100);
252
253 setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
254#ifdef QT_OPENGL_SUPPORT
255 m_pbuffer = 0;
256 m_pbuffer_size = 1024;
257#endif
258}
259
260QRectF rectangle_around(const QPointF &p, const QSizeF &size = QSize(250, 200))
261{
262 QRectF rect(p, size);
263 rect.translate(-size.width()/2, -size.height()/2);
264 return rect;
265}
266
267void CompositionRenderer::updateCirclePos()
268{
269 if (m_current_object != NoObject)
270 return;
271 QDateTime dt = QDateTime::currentDateTime();
272 qreal t = (dt.toTime_t() * 1000 + dt.time().msec()) / 1000.0;
273
274 qreal x = width() / qreal(2) + (qCos(t*8/11) + qSin(-t)) * width() / qreal(4);
275 qreal y = height() / qreal(2) + (qSin(t*6/7) + qCos(t * qreal(1.5))) * height() / qreal(4);
276
277 setCirclePos(QLineF(m_circle_pos, QPointF(x, y)).pointAt(0.02));
278}
279
280void CompositionRenderer::drawBase(QPainter &p)
281{
282 p.setPen(Qt::NoPen);
283
284 QLinearGradient rect_gradient(0, 0, 0, height());
285 rect_gradient.setColorAt(0, Qt::red);
286 rect_gradient.setColorAt(.17, Qt::yellow);
287 rect_gradient.setColorAt(.33, Qt::green);
288 rect_gradient.setColorAt(.50, Qt::cyan);
289 rect_gradient.setColorAt(.66, Qt::blue);
290 rect_gradient.setColorAt(.81, Qt::magenta);
291 rect_gradient.setColorAt(1, Qt::red);
292 p.setBrush(rect_gradient);
293 p.drawRect(width() / 2, 0, width() / 2, height());
294
295 QLinearGradient alpha_gradient(0, 0, width(), 0);
296 alpha_gradient.setColorAt(0, Qt::white);
297 alpha_gradient.setColorAt(0.2, Qt::white);
298 alpha_gradient.setColorAt(0.5, Qt::transparent);
299 alpha_gradient.setColorAt(0.8, Qt::white);
300 alpha_gradient.setColorAt(1, Qt::white);
301
302 p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
303 p.setBrush(alpha_gradient);
304 p.drawRect(0, 0, width(), height());
305
306 p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
307
308 p.setPen(Qt::NoPen);
309 p.setRenderHint(QPainter::SmoothPixmapTransform);
310#ifdef Q_WS_QWS
311 p.drawPixmap(rect(), m_image);
312#else
313 p.drawImage(rect(), m_image);
314#endif
315}
316
317void CompositionRenderer::drawSource(QPainter &p)
318{
319 p.setPen(Qt::NoPen);
320 p.setRenderHint(QPainter::Antialiasing);
321 p.setCompositionMode(m_composition_mode);
322
323 QRectF circle_rect = rectangle_around(m_circle_pos);
324 QColor color = QColor::fromHsvF(m_circle_hue / 360.0, 1, 1, m_circle_alpha / 255.0);
325 QLinearGradient circle_gradient(circle_rect.topLeft(), circle_rect.bottomRight());
326 circle_gradient.setColorAt(0, color.light());
327 circle_gradient.setColorAt(0.5, color);
328 circle_gradient.setColorAt(1, color.dark());
329 p.setBrush(circle_gradient);
330
331 p.drawEllipse(circle_rect);
332}
333
334void CompositionRenderer::paint(QPainter *painter)
335{
336#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
337 if (usesOpenGL()) {
338
339 int new_pbuf_size = m_pbuffer_size;
340 if (size().width() > m_pbuffer_size ||
341 size().height() > m_pbuffer_size)
342 new_pbuf_size *= 2;
343
344 if (size().width() < m_pbuffer_size/2 &&
345 size().height() < m_pbuffer_size/2)
346 new_pbuf_size /= 2;
347
348 if (!m_pbuffer || new_pbuf_size != m_pbuffer_size) {
349 if (m_pbuffer) {
350 m_pbuffer->deleteTexture(m_base_tex);
351 m_pbuffer->deleteTexture(m_compositing_tex);
352 delete m_pbuffer;
353 }
354
355 m_pbuffer = new QGLPixelBuffer(QSize(new_pbuf_size, new_pbuf_size), QGLFormat::defaultFormat(), glWidget());
356 m_pbuffer->makeCurrent();
357 m_base_tex = m_pbuffer->generateDynamicTexture();
358 m_compositing_tex = m_pbuffer->generateDynamicTexture();
359 m_pbuffer_size = new_pbuf_size;
360 }
361
362 if (size() != m_previous_size) {
363 m_previous_size = size();
364 QPainter p(m_pbuffer);
365 p.setCompositionMode(QPainter::CompositionMode_Source);
366 p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
367 drawBase(p);
368 p.end();
369 m_pbuffer->updateDynamicTexture(m_base_tex);
370 }
371
372 qreal x_fraction = width()/float(m_pbuffer->width());
373 qreal y_fraction = height()/float(m_pbuffer->height());
374
375 {
376 QPainter p(m_pbuffer);
377 p.setCompositionMode(QPainter::CompositionMode_Source);
378 p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
379
380 p.save(); // Needed when using the GL1 engine
381 p.beginNativePainting(); // Needed when using the GL2 engine
382
383 glBindTexture(GL_TEXTURE_2D, m_base_tex);
384 glEnable(GL_TEXTURE_2D);
385 glColor4f(1.,1.,1.,1.);
386
387 glBegin(GL_QUADS);
388 {
389 glTexCoord2f(0, 1.0);
390 glVertex2f(0, 0);
391
392 glTexCoord2f(x_fraction, 1.0);
393 glVertex2f(width(), 0);
394
395 glTexCoord2f(x_fraction, 1.0-y_fraction);
396 glVertex2f(width(), height());
397
398 glTexCoord2f(0, 1.0-y_fraction);
399 glVertex2f(0, height());
400 }
401 glEnd();
402
403 glDisable(GL_TEXTURE_2D);
404
405 p.endNativePainting(); // Needed when using the GL2 engine
406 p.restore(); // Needed when using the GL1 engine
407
408 drawSource(p);
409 p.end();
410 m_pbuffer->updateDynamicTexture(m_compositing_tex);
411 }
412
413 painter->beginNativePainting(); // Needed when using the GL2 engine
414 glWidget()->makeCurrent(); // Needed when using the GL1 engine
415 glBindTexture(GL_TEXTURE_2D, m_compositing_tex);
416 glEnable(GL_TEXTURE_2D);
417 glEnable(GL_BLEND);
418 glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
419 glColor4f(1.,1.,1.,1.);
420 glBegin(GL_QUADS);
421 {
422 glTexCoord2f(0, 1.0);
423 glVertex2f(0, 0);
424
425 glTexCoord2f(x_fraction, 1.0);
426 glVertex2f(width(), 0);
427
428 glTexCoord2f(x_fraction, 1.0-y_fraction);
429 glVertex2f(width(), height());
430
431 glTexCoord2f(0, 1.0-y_fraction);
432 glVertex2f(0, height());
433 }
434 glEnd();
435 glDisable(GL_TEXTURE_2D);
436 painter->endNativePainting(); // Needed when using the GL2 engine
437 } else
438#endif
439 {
440 // using a QImage
441 if (m_buffer.size() != size()) {
442#ifdef Q_WS_QWS
443 m_base_buffer = QPixmap(size());
444 m_base_buffer.fill(Qt::transparent);
445#else
446 m_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
447 m_base_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
448
449 m_base_buffer.fill(0);
450#endif
451
452 QPainter p(&m_base_buffer);
453
454 drawBase(p);
455 }
456
457#ifdef Q_WS_QWS
458 m_buffer = m_base_buffer;
459#else
460 memcpy(m_buffer.bits(), m_base_buffer.bits(), m_buffer.byteCount());
461#endif
462
463 {
464 QPainter p(&m_buffer);
465 drawSource(p);
466 }
467
468#ifdef Q_WS_QWS
469 painter->drawPixmap(0, 0, m_buffer);
470#else
471 painter->drawImage(0, 0, m_buffer);
472#endif
473 }
474
475 if (m_animation_enabled && m_current_object == NoObject) {
476 updateCirclePos();
477 }
478}
479
480void CompositionRenderer::mousePressEvent(QMouseEvent *e)
481{
482 setDescriptionEnabled(false);
483
484 QRectF circle = rectangle_around(m_circle_pos);
485
486 if (circle.contains(e->pos())) {
487 m_current_object = Circle;
488 m_offset = circle.center() - e->pos();
489 } else {
490 m_current_object = NoObject;
491 }
492}
493
494void CompositionRenderer::mouseMoveEvent(QMouseEvent *e)
495{
496 if (m_current_object == Circle) setCirclePos(e->pos() + m_offset);
497}
498
499void CompositionRenderer::mouseReleaseEvent(QMouseEvent *)
500{
501 m_current_object = NoObject;
502
503 if (m_animation_enabled)
504 updateCirclePos();
505}
506
507void CompositionRenderer::setCirclePos(const QPointF &pos)
508{
509 const QRect oldRect = rectangle_around(m_circle_pos).toAlignedRect();
510 m_circle_pos = pos;
511 const QRect newRect = rectangle_around(m_circle_pos).toAlignedRect();
512#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
513 if (usesOpenGL())
514 update();
515 else
516#endif
517 update(oldRect | newRect);
518}
519
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