composition.cpp Example File

painting/composition/composition.cpp
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#include "composition.h" #include <QBoxLayout> #include <QRadioButton> #include <QTimer> #include <QDateTime> #include <QSlider> #include <QMouseEvent> #include <qmath.h> #if QT_CONFIG(opengl) #include <QOpenGLFunctions> #include <QOpenGLWindow> #endif 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 QT_CONFIG(opengl) QPushButton *enableOpenGLButton = new QPushButton(mainGroup); enableOpenGLButton->setText(tr("Use OpenGL")); enableOpenGLButton->setCheckable(true); enableOpenGLButton->setChecked(view->usesOpenGL()); #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 QT_CONFIG(opengl) 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 QT_CONFIG(opengl) 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); m_image = QImage(":res/composition/flower.jpg"); m_image.setAlphaChannel(QImage(":res/composition/flower_alpha.jpg")); 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); #if QT_CONFIG(opengl) 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.toMSecsSinceEpoch() / 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); p.drawImage(rect(), m_image); } 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 QT_CONFIG(opengl) if (usesOpenGL() && glWindow()->isValid()) { if (!m_blitter.isCreated()) m_blitter.create(); int new_pbuf_size = m_pbuffer_size; while (size().width() > new_pbuf_size || size().height() > new_pbuf_size) new_pbuf_size *= 2; while (size().width() < new_pbuf_size/2 && size().height() < new_pbuf_size/2) new_pbuf_size /= 2; if (!m_fbo || new_pbuf_size != m_pbuffer_size) { m_fbo.reset(new QFboPaintDevice(QSize(new_pbuf_size, new_pbuf_size), false, false)); m_pbuffer_size = new_pbuf_size; } if (size() != m_previous_size) { m_previous_size = size(); QPainter p(m_fbo.data()); p.setCompositionMode(QPainter::CompositionMode_Source); p.fillRect(QRect(QPoint(0, 0), size()), Qt::transparent); p.setCompositionMode(QPainter::CompositionMode_SourceOver); drawBase(p); p.end(); m_base_tex = m_fbo->takeTexture(); } painter->beginNativePainting(); { QPainter p(m_fbo.data()); p.beginNativePainting(); m_blitter.bind(); const QRect targetRect(QPoint(0, 0), m_fbo->size()); const QMatrix4x4 target = QOpenGLTextureBlitter::targetTransform(targetRect, QRect(QPoint(0, 0), m_fbo->size())); m_blitter.blit(m_base_tex, target, QOpenGLTextureBlitter::OriginBottomLeft); m_blitter.release(); p.endNativePainting(); drawSource(p); p.end(); m_compositing_tex = m_fbo->takeTexture(); } painter->endNativePainting(); painter->beginNativePainting(); auto *funcs = QOpenGLContext::currentContext()->functions(); funcs->glEnable(GL_BLEND); funcs->glBlendEquation(GL_FUNC_ADD); funcs->glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA); m_blitter.bind(); const QRect targetRect(QPoint(0, 0), m_fbo->size()); const QMatrix4x4 target = QOpenGLTextureBlitter::targetTransform(targetRect, QRect(QPoint(0, 0), size())); m_blitter.blit(m_compositing_tex, target, QOpenGLTextureBlitter::OriginBottomLeft); m_blitter.release(); painter->endNativePainting(); } else #endif { // using a QImage if (m_buffer.size() != size()) { m_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied); m_base_buffer = QImage(size(), QImage::Format_ARGB32_Premultiplied); m_base_buffer.fill(0); QPainter p(&m_base_buffer); drawBase(p); } memcpy(m_buffer.bits(), m_base_buffer.bits(), m_buffer.sizeInBytes()); { QPainter p(&m_buffer); drawSource(p); } painter->drawImage(0, 0, m_buffer); } } 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 QT_CONFIG(opengl) if (usesOpenGL()) { update(); return; } #endif update(oldRect | newRect); }