composition.cpp Example File
demos/composition/composition.cpp/**************************************************************************** ** ** Copyright (C) 2015 The Qt Company Ltd. ** Contact: http://www.qt.io/licensing/ ** ** This file is part of the demonstration applications of the Qt Toolkit. ** ** $QT_BEGIN_LICENSE:LGPL$ ** Commercial License Usage ** Licensees holding valid commercial Qt licenses may use this file in ** accordance with the commercial license agreement provided with the ** Software or, alternatively, in accordance with the terms contained in ** a written agreement between you and The Qt Company. For licensing terms ** and conditions see http://www.qt.io/terms-conditions. For further ** information use the contact form at http://www.qt.io/contact-us. ** ** 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 or version 3 as published by the Free ** Software Foundation and appearing in the file LICENSE.LGPLv21 and ** LICENSE.LGPLv3 included in the packaging of this file. Please review the ** following information to ensure the GNU Lesser General Public License ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. ** ** As a special exception, The Qt Company gives you certain additional ** rights. These rights are described in The Qt Company LGPL Exception ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. ** ** GNU General Public License Usage ** Alternatively, this file may be used under the terms of the GNU ** General Public License version 3.0 as published by the Free Software ** Foundation and appearing in the file LICENSE.GPL included in the ** packaging of this file. Please review the following information to ** ensure the GNU General Public License version 3.0 requirements will be ** met: http://www.gnu.org/copyleft/gpl.html. ** ** $QT_END_LICENSE$ ** ****************************************************************************/ #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); }
© 2016 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.