qt5base-lts/demos/composition/composition.cpp
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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12
2011-04-27 12:05:43 +02:00

545 lines
20 KiB
C++

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "composition.h"
#include <QBoxLayout>
#include <QRadioButton>
#include <QTimer>
#include <QDateTime>
#include <QSlider>
#include <QMouseEvent>
#include <qmath.h>
const int animationInterval = 15; // update every 16 ms = ~60FPS
CompositionWidget::CompositionWidget(QWidget *parent)
: QWidget(parent)
{
CompositionRenderer *view = new CompositionRenderer(this);
QGroupBox *mainGroup = new QGroupBox(parent);
mainGroup->setTitle(tr("Composition Modes"));
QGroupBox *modesGroup = new QGroupBox(mainGroup);
modesGroup->setTitle(tr("Mode"));
rbClear = new QRadioButton(tr("Clear"), modesGroup);
connect(rbClear, SIGNAL(clicked()), view, SLOT(setClearMode()));
rbSource = new QRadioButton(tr("Source"), modesGroup);
connect(rbSource, SIGNAL(clicked()), view, SLOT(setSourceMode()));
rbDest = new QRadioButton(tr("Destination"), modesGroup);
connect(rbDest, SIGNAL(clicked()), view, SLOT(setDestMode()));
rbSourceOver = new QRadioButton(tr("Source Over"), modesGroup);
connect(rbSourceOver, SIGNAL(clicked()), view, SLOT(setSourceOverMode()));
rbDestOver = new QRadioButton(tr("Destination Over"), modesGroup);
connect(rbDestOver, SIGNAL(clicked()), view, SLOT(setDestOverMode()));
rbSourceIn = new QRadioButton(tr("Source In"), modesGroup);
connect(rbSourceIn, SIGNAL(clicked()), view, SLOT(setSourceInMode()));
rbDestIn = new QRadioButton(tr("Dest In"), modesGroup);
connect(rbDestIn, SIGNAL(clicked()), view, SLOT(setDestInMode()));
rbSourceOut = new QRadioButton(tr("Source Out"), modesGroup);
connect(rbSourceOut, SIGNAL(clicked()), view, SLOT(setSourceOutMode()));
rbDestOut = new QRadioButton(tr("Dest Out"), modesGroup);
connect(rbDestOut, SIGNAL(clicked()), view, SLOT(setDestOutMode()));
rbSourceAtop = new QRadioButton(tr("Source Atop"), modesGroup);
connect(rbSourceAtop, SIGNAL(clicked()), view, SLOT(setSourceAtopMode()));
rbDestAtop = new QRadioButton(tr("Dest Atop"), modesGroup);
connect(rbDestAtop, SIGNAL(clicked()), view, SLOT(setDestAtopMode()));
rbXor = new QRadioButton(tr("Xor"), modesGroup);
connect(rbXor, SIGNAL(clicked()), view, SLOT(setXorMode()));
rbPlus = new QRadioButton(tr("Plus"), modesGroup);
connect(rbPlus, SIGNAL(clicked()), view, SLOT(setPlusMode()));
rbMultiply = new QRadioButton(tr("Multiply"), modesGroup);
connect(rbMultiply, SIGNAL(clicked()), view, SLOT(setMultiplyMode()));
rbScreen = new QRadioButton(tr("Screen"), modesGroup);
connect(rbScreen, SIGNAL(clicked()), view, SLOT(setScreenMode()));
rbOverlay = new QRadioButton(tr("Overlay"), modesGroup);
connect(rbOverlay, SIGNAL(clicked()), view, SLOT(setOverlayMode()));
rbDarken = new QRadioButton(tr("Darken"), modesGroup);
connect(rbDarken, SIGNAL(clicked()), view, SLOT(setDarkenMode()));
rbLighten = new QRadioButton(tr("Lighten"), modesGroup);
connect(rbLighten, SIGNAL(clicked()), view, SLOT(setLightenMode()));
rbColorDodge = new QRadioButton(tr("Color Dodge"), modesGroup);
connect(rbColorDodge, SIGNAL(clicked()), view, SLOT(setColorDodgeMode()));
rbColorBurn = new QRadioButton(tr("Color Burn"), modesGroup);
connect(rbColorBurn, SIGNAL(clicked()), view, SLOT(setColorBurnMode()));
rbHardLight = new QRadioButton(tr("Hard Light"), modesGroup);
connect(rbHardLight, SIGNAL(clicked()), view, SLOT(setHardLightMode()));
rbSoftLight = new QRadioButton(tr("Soft Light"), modesGroup);
connect(rbSoftLight, SIGNAL(clicked()), view, SLOT(setSoftLightMode()));
rbDifference = new QRadioButton(tr("Difference"), modesGroup);
connect(rbDifference, SIGNAL(clicked()), view, SLOT(setDifferenceMode()));
rbExclusion = new QRadioButton(tr("Exclusion"), modesGroup);
connect(rbExclusion, SIGNAL(clicked()), view, SLOT(setExclusionMode()));
QGroupBox *circleColorGroup = new QGroupBox(mainGroup);
circleColorGroup->setTitle(tr("Circle color"));
QSlider *circleColorSlider = new QSlider(Qt::Horizontal, circleColorGroup);
circleColorSlider->setRange(0, 359);
circleColorSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
connect(circleColorSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleColor(int)));
QGroupBox *circleAlphaGroup = new QGroupBox(mainGroup);
circleAlphaGroup->setTitle(tr("Circle alpha"));
QSlider *circleAlphaSlider = new QSlider(Qt::Horizontal, circleAlphaGroup);
circleAlphaSlider->setRange(0, 255);
circleAlphaSlider->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
connect(circleAlphaSlider, SIGNAL(valueChanged(int)), view, SLOT(setCircleAlpha(int)));
QPushButton *showSourceButton = new QPushButton(mainGroup);
showSourceButton->setText(tr("Show Source"));
#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
QPushButton *enableOpenGLButton = new QPushButton(mainGroup);
enableOpenGLButton->setText(tr("Use OpenGL"));
enableOpenGLButton->setCheckable(true);
enableOpenGLButton->setChecked(view->usesOpenGL());
if (!QGLFormat::hasOpenGL() || !QGLPixelBuffer::hasOpenGLPbuffers())
enableOpenGLButton->hide();
#endif
QPushButton *whatsThisButton = new QPushButton(mainGroup);
whatsThisButton->setText(tr("What's This?"));
whatsThisButton->setCheckable(true);
QPushButton *animateButton = new QPushButton(mainGroup);
animateButton->setText(tr("Animated"));
animateButton->setCheckable(true);
animateButton->setChecked(true);
QHBoxLayout *viewLayout = new QHBoxLayout(this);
viewLayout->addWidget(view);
viewLayout->addWidget(mainGroup);
QVBoxLayout *mainGroupLayout = new QVBoxLayout(mainGroup);
mainGroupLayout->addWidget(circleColorGroup);
mainGroupLayout->addWidget(circleAlphaGroup);
mainGroupLayout->addWidget(modesGroup);
mainGroupLayout->addStretch();
mainGroupLayout->addWidget(animateButton);
mainGroupLayout->addWidget(whatsThisButton);
mainGroupLayout->addWidget(showSourceButton);
#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
mainGroupLayout->addWidget(enableOpenGLButton);
#endif
QGridLayout *modesLayout = new QGridLayout(modesGroup);
modesLayout->addWidget(rbClear, 0, 0);
modesLayout->addWidget(rbSource, 1, 0);
modesLayout->addWidget(rbDest, 2, 0);
modesLayout->addWidget(rbSourceOver, 3, 0);
modesLayout->addWidget(rbDestOver, 4, 0);
modesLayout->addWidget(rbSourceIn, 5, 0);
modesLayout->addWidget(rbDestIn, 6, 0);
modesLayout->addWidget(rbSourceOut, 7, 0);
modesLayout->addWidget(rbDestOut, 8, 0);
modesLayout->addWidget(rbSourceAtop, 9, 0);
modesLayout->addWidget(rbDestAtop, 10, 0);
modesLayout->addWidget(rbXor, 11, 0);
modesLayout->addWidget(rbPlus, 0, 1);
modesLayout->addWidget(rbMultiply, 1, 1);
modesLayout->addWidget(rbScreen, 2, 1);
modesLayout->addWidget(rbOverlay, 3, 1);
modesLayout->addWidget(rbDarken, 4, 1);
modesLayout->addWidget(rbLighten, 5, 1);
modesLayout->addWidget(rbColorDodge, 6, 1);
modesLayout->addWidget(rbColorBurn, 7, 1);
modesLayout->addWidget(rbHardLight, 8, 1);
modesLayout->addWidget(rbSoftLight, 9, 1);
modesLayout->addWidget(rbDifference, 10, 1);
modesLayout->addWidget(rbExclusion, 11, 1);
QVBoxLayout *circleColorLayout = new QVBoxLayout(circleColorGroup);
circleColorLayout->addWidget(circleColorSlider);
QVBoxLayout *circleAlphaLayout = new QVBoxLayout(circleAlphaGroup);
circleAlphaLayout->addWidget(circleAlphaSlider);
view->loadDescription(":res/composition/composition.html");
view->loadSourceFile(":res/composition/composition.cpp");
connect(whatsThisButton, SIGNAL(clicked(bool)), view, SLOT(setDescriptionEnabled(bool)));
connect(view, SIGNAL(descriptionEnabledChanged(bool)), whatsThisButton, SLOT(setChecked(bool)));
connect(showSourceButton, SIGNAL(clicked()), view, SLOT(showSource()));
#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
connect(enableOpenGLButton, SIGNAL(clicked(bool)), view, SLOT(enableOpenGL(bool)));
#endif
connect(animateButton, SIGNAL(toggled(bool)), view, SLOT(setAnimationEnabled(bool)));
circleColorSlider->setValue(270);
circleAlphaSlider->setValue(200);
rbSourceOut->animateClick();
setWindowTitle(tr("Composition Modes"));
}
void CompositionWidget::nextMode()
{
/*
if (!m_animation_enabled)
return;
if (rbClear->isChecked()) rbSource->animateClick();
if (rbSource->isChecked()) rbDest->animateClick();
if (rbDest->isChecked()) rbSourceOver->animateClick();
if (rbSourceOver->isChecked()) rbDestOver->animateClick();
if (rbDestOver->isChecked()) rbSourceIn->animateClick();
if (rbSourceIn->isChecked()) rbDestIn->animateClick();
if (rbDestIn->isChecked()) rbSourceOut->animateClick();
if (rbSourceOut->isChecked()) rbDestOut->animateClick();
if (rbDestOut->isChecked()) rbSourceAtop->animateClick();
if (rbSourceAtop->isChecked()) rbDestAtop->animateClick();
if (rbDestAtop->isChecked()) rbXor->animateClick();
if (rbXor->isChecked()) rbClear->animateClick();
*/
}
CompositionRenderer::CompositionRenderer(QWidget *parent)
: ArthurFrame(parent)
{
m_animation_enabled = true;
m_animationTimer = startTimer(animationInterval);
#ifdef Q_WS_QWS
m_image = QPixmap(":res/composition/flower.jpg");
m_image.setAlphaChannel(QPixmap(":res/composition/flower_alpha.jpg"));
#else
m_image = QImage(":res/composition/flower.jpg");
m_image.setAlphaChannel(QImage(":res/composition/flower_alpha.jpg"));
#endif
m_circle_alpha = 127;
m_circle_hue = 255;
m_current_object = NoObject;
m_composition_mode = QPainter::CompositionMode_SourceOut;
m_circle_pos = QPoint(200, 100);
setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
#ifdef QT_OPENGL_SUPPORT
m_pbuffer = 0;
m_pbuffer_size = 1024;
#endif
}
QRectF rectangle_around(const QPointF &p, const QSizeF &size = QSize(250, 200))
{
QRectF rect(p, size);
rect.translate(-size.width()/2, -size.height()/2);
return rect;
}
void CompositionRenderer::setAnimationEnabled(bool enabled)
{
if (m_animation_enabled == enabled)
return;
m_animation_enabled = enabled;
if (enabled) {
Q_ASSERT(!m_animationTimer);
m_animationTimer = startTimer(animationInterval);
} else {
killTimer(m_animationTimer);
m_animationTimer = 0;
}
}
void CompositionRenderer::updateCirclePos()
{
if (m_current_object != NoObject)
return;
QDateTime dt = QDateTime::currentDateTime();
qreal t = (dt.toTime_t() * 1000 + dt.time().msec()) / 1000.0;
qreal x = width() / qreal(2) + (qCos(t*8/11) + qSin(-t)) * width() / qreal(4);
qreal y = height() / qreal(2) + (qSin(t*6/7) + qCos(t * qreal(1.5))) * height() / qreal(4);
setCirclePos(QLineF(m_circle_pos, QPointF(x, y)).pointAt(0.02));
}
void CompositionRenderer::drawBase(QPainter &p)
{
p.setPen(Qt::NoPen);
QLinearGradient rect_gradient(0, 0, 0, height());
rect_gradient.setColorAt(0, Qt::red);
rect_gradient.setColorAt(.17, Qt::yellow);
rect_gradient.setColorAt(.33, Qt::green);
rect_gradient.setColorAt(.50, Qt::cyan);
rect_gradient.setColorAt(.66, Qt::blue);
rect_gradient.setColorAt(.81, Qt::magenta);
rect_gradient.setColorAt(1, Qt::red);
p.setBrush(rect_gradient);
p.drawRect(width() / 2, 0, width() / 2, height());
QLinearGradient alpha_gradient(0, 0, width(), 0);
alpha_gradient.setColorAt(0, Qt::white);
alpha_gradient.setColorAt(0.2, Qt::white);
alpha_gradient.setColorAt(0.5, Qt::transparent);
alpha_gradient.setColorAt(0.8, Qt::white);
alpha_gradient.setColorAt(1, Qt::white);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.setBrush(alpha_gradient);
p.drawRect(0, 0, width(), height());
p.setCompositionMode(QPainter::CompositionMode_DestinationOver);
p.setPen(Qt::NoPen);
p.setRenderHint(QPainter::SmoothPixmapTransform);
#ifdef Q_WS_QWS
p.drawPixmap(rect(), m_image);
#else
p.drawImage(rect(), m_image);
#endif
}
void CompositionRenderer::drawSource(QPainter &p)
{
p.setPen(Qt::NoPen);
p.setRenderHint(QPainter::Antialiasing);
p.setCompositionMode(m_composition_mode);
QRectF circle_rect = rectangle_around(m_circle_pos);
QColor color = QColor::fromHsvF(m_circle_hue / 360.0, 1, 1, m_circle_alpha / 255.0);
QLinearGradient circle_gradient(circle_rect.topLeft(), circle_rect.bottomRight());
circle_gradient.setColorAt(0, color.light());
circle_gradient.setColorAt(0.5, color);
circle_gradient.setColorAt(1, color.dark());
p.setBrush(circle_gradient);
p.drawEllipse(circle_rect);
}
void CompositionRenderer::paint(QPainter *painter)
{
#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
if (usesOpenGL()) {
int new_pbuf_size = m_pbuffer_size;
if (size().width() > m_pbuffer_size ||
size().height() > m_pbuffer_size)
new_pbuf_size *= 2;
if (size().width() < m_pbuffer_size/2 &&
size().height() < m_pbuffer_size/2)
new_pbuf_size /= 2;
if (!m_pbuffer || new_pbuf_size != m_pbuffer_size) {
if (m_pbuffer) {
m_pbuffer->deleteTexture(m_base_tex);
m_pbuffer->deleteTexture(m_compositing_tex);
delete m_pbuffer;
}
m_pbuffer = new QGLPixelBuffer(QSize(new_pbuf_size, new_pbuf_size), QGLFormat::defaultFormat(), glWidget());
m_pbuffer->makeCurrent();
m_base_tex = m_pbuffer->generateDynamicTexture();
m_compositing_tex = m_pbuffer->generateDynamicTexture();
m_pbuffer_size = new_pbuf_size;
}
if (size() != m_previous_size) {
m_previous_size = size();
QPainter p(m_pbuffer);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
drawBase(p);
p.end();
m_pbuffer->updateDynamicTexture(m_base_tex);
}
qreal x_fraction = width()/float(m_pbuffer->width());
qreal y_fraction = height()/float(m_pbuffer->height());
{
QPainter p(m_pbuffer);
p.setCompositionMode(QPainter::CompositionMode_Source);
p.fillRect(QRect(0, 0, m_pbuffer->width(), m_pbuffer->height()), Qt::transparent);
p.save(); // Needed when using the GL1 engine
p.beginNativePainting(); // Needed when using the GL2 engine
glBindTexture(GL_TEXTURE_2D, m_base_tex);
glEnable(GL_TEXTURE_2D);
glColor4f(1.,1.,1.,1.);
glBegin(GL_QUADS);
{
glTexCoord2f(0, 1.0);
glVertex2f(0, 0);
glTexCoord2f(x_fraction, 1.0);
glVertex2f(width(), 0);
glTexCoord2f(x_fraction, 1.0-y_fraction);
glVertex2f(width(), height());
glTexCoord2f(0, 1.0-y_fraction);
glVertex2f(0, height());
}
glEnd();
glDisable(GL_TEXTURE_2D);
p.endNativePainting(); // Needed when using the GL2 engine
p.restore(); // Needed when using the GL1 engine
drawSource(p);
p.end();
m_pbuffer->updateDynamicTexture(m_compositing_tex);
}
painter->beginNativePainting(); // Needed when using the GL2 engine
glWidget()->makeCurrent(); // Needed when using the GL1 engine
glBindTexture(GL_TEXTURE_2D, m_compositing_tex);
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(1.,1.,1.,1.);
glBegin(GL_QUADS);
{
glTexCoord2f(0, 1.0);
glVertex2f(0, 0);
glTexCoord2f(x_fraction, 1.0);
glVertex2f(width(), 0);
glTexCoord2f(x_fraction, 1.0-y_fraction);
glVertex2f(width(), height());
glTexCoord2f(0, 1.0-y_fraction);
glVertex2f(0, height());
}
glEnd();
glDisable(GL_TEXTURE_2D);
painter->endNativePainting(); // Needed when using the GL2 engine
} else
#endif
{
// using a QImage
if (m_buffer.size() != size()) {
#ifdef Q_WS_QWS
m_base_buffer = QPixmap(size());
m_base_buffer.fill(Qt::transparent);
#else
m_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
m_base_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied);
m_base_buffer.fill(0);
#endif
QPainter p(&m_base_buffer);
drawBase(p);
}
#ifdef Q_WS_QWS
m_buffer = m_base_buffer;
#else
memcpy(m_buffer.bits(), m_base_buffer.bits(), m_buffer.byteCount());
#endif
{
QPainter p(&m_buffer);
drawSource(p);
}
#ifdef Q_WS_QWS
painter->drawPixmap(0, 0, m_buffer);
#else
painter->drawImage(0, 0, m_buffer);
#endif
}
}
void CompositionRenderer::mousePressEvent(QMouseEvent *e)
{
setDescriptionEnabled(false);
QRectF circle = rectangle_around(m_circle_pos);
if (circle.contains(e->pos())) {
m_current_object = Circle;
m_offset = circle.center() - e->pos();
} else {
m_current_object = NoObject;
}
if (m_animation_enabled) {
killTimer(m_animationTimer);
m_animationTimer = 0;
}
}
void CompositionRenderer::mouseMoveEvent(QMouseEvent *e)
{
if (m_current_object == Circle) setCirclePos(e->pos() + m_offset);
}
void CompositionRenderer::mouseReleaseEvent(QMouseEvent *)
{
m_current_object = NoObject;
if (m_animation_enabled) {
Q_ASSERT(!m_animationTimer);
m_animationTimer = startTimer(animationInterval);
}
}
void CompositionRenderer::timerEvent(QTimerEvent *event)
{
if (event->timerId() == m_animationTimer)
updateCirclePos();
}
void CompositionRenderer::setCirclePos(const QPointF &pos)
{
const QRect oldRect = rectangle_around(m_circle_pos).toAlignedRect();
m_circle_pos = pos;
const QRect newRect = rectangle_around(m_circle_pos).toAlignedRect();
#if defined(QT_OPENGL_SUPPORT) && !defined(QT_OPENGL_ES)
if (usesOpenGL())
update();
else
#endif
update(oldRect | newRect);
}