composition.h Example File | Qt Widgets 5.12.8

- Qt 5.12
- Qt Widgets
- Composition Modes
- composition.h Example File
- Qt 5.12.8 Reference Documentation

# composition.h Example File

painting/composition/composition.h

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the demonstration applications of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** 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 https://www.qt.io/terms-conditions. For further
     ** information use the contact form at https://www.qt.io/contact-us.
     **
     ** BSD License Usage
     ** Alternatively, you may use this file under the terms of the BSD license
     ** as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #ifndef COMPOSITION_H
     #define COMPOSITION_H

     #include "arthurwidgets.h"

     #if QT_CONFIG(opengl)
     #include "fbopaintdevice.h"
     #include <QOpenGLTextureBlitter>
     #endif

     #include <QPainter>
     #include <QEvent>

     class QPushButton;
     class QRadioButton;

     class CompositionWidget : public QWidget
     {
         Q_OBJECT

     public:
         CompositionWidget(QWidget *parent);

     public slots:
     void nextMode();

     private:
         bool m_cycle_enabled;

         QRadioButton *rbClear;
         QRadioButton *rbSource;
         QRadioButton *rbDest;
         QRadioButton *rbSourceOver;
         QRadioButton *rbDestOver;
         QRadioButton *rbSourceIn;
         QRadioButton *rbDestIn;
         QRadioButton *rbSourceOut;
         QRadioButton *rbDestOut;
         QRadioButton *rbSourceAtop;
         QRadioButton *rbDestAtop;
         QRadioButton *rbXor;

         QRadioButton *rbPlus;
         QRadioButton *rbMultiply;
         QRadioButton *rbScreen;
         QRadioButton *rbOverlay;
         QRadioButton *rbDarken;
         QRadioButton *rbLighten;
         QRadioButton *rbColorDodge;
         QRadioButton *rbColorBurn;
         QRadioButton *rbHardLight;
         QRadioButton *rbSoftLight;
         QRadioButton *rbDifference;
         QRadioButton *rbExclusion;
     };

     class CompositionRenderer : public ArthurFrame
     {
         Q_OBJECT

         enum ObjectType { NoObject, Circle, Rectangle, Image };

         Q_PROPERTY(int circleColor READ circleColor WRITE setCircleColor)
         Q_PROPERTY(int circleAlpha READ circleAlpha WRITE setCircleAlpha)
         Q_PROPERTY(bool animation READ animationEnabled WRITE setAnimationEnabled)

     public:
         CompositionRenderer(QWidget *parent);

         void paint(QPainter *) override;

         void setCirclePos(const QPointF &pos);

         QSize sizeHint() const override { return QSize(500, 400); }

         bool animationEnabled() const { return m_animation_enabled; }
         int circleColor() const { return m_circle_hue; }
         int circleAlpha() const { return m_circle_alpha; }

     protected:
         void mousePressEvent(QMouseEvent *) override;
         void mouseMoveEvent(QMouseEvent *) override;
         void mouseReleaseEvent(QMouseEvent *) override;
         void timerEvent(QTimerEvent *) override;

     public slots:
         void setClearMode() { m_composition_mode = QPainter::CompositionMode_Clear; update(); }
         void setSourceMode() { m_composition_mode = QPainter::CompositionMode_Source; update(); }
         void setDestMode() { m_composition_mode = QPainter::CompositionMode_Destination; update(); }
         void setSourceOverMode() { m_composition_mode = QPainter::CompositionMode_SourceOver; update(); }
         void setDestOverMode() { m_composition_mode = QPainter::CompositionMode_DestinationOver; update(); }
         void setSourceInMode() { m_composition_mode = QPainter::CompositionMode_SourceIn; update(); }
         void setDestInMode() { m_composition_mode = QPainter::CompositionMode_DestinationIn; update(); }
         void setSourceOutMode() { m_composition_mode = QPainter::CompositionMode_SourceOut; update(); }
         void setDestOutMode() { m_composition_mode = QPainter::CompositionMode_DestinationOut; update(); }
         void setSourceAtopMode() { m_composition_mode = QPainter::CompositionMode_SourceAtop; update(); }
         void setDestAtopMode() { m_composition_mode = QPainter::CompositionMode_DestinationAtop; update(); }
         void setXorMode() { m_composition_mode = QPainter::CompositionMode_Xor; update(); }

         void setPlusMode() { m_composition_mode = QPainter::CompositionMode_Plus; update(); }
         void setMultiplyMode() { m_composition_mode = QPainter::CompositionMode_Multiply; update(); }
         void setScreenMode() { m_composition_mode = QPainter::CompositionMode_Screen; update(); }
         void setOverlayMode() { m_composition_mode = QPainter::CompositionMode_Overlay; update(); }
         void setDarkenMode() { m_composition_mode = QPainter::CompositionMode_Darken; update(); }
         void setLightenMode() { m_composition_mode = QPainter::CompositionMode_Lighten; update(); }
         void setColorDodgeMode() { m_composition_mode = QPainter::CompositionMode_ColorDodge; update(); }
         void setColorBurnMode() { m_composition_mode = QPainter::CompositionMode_ColorBurn; update(); }
         void setHardLightMode() { m_composition_mode = QPainter::CompositionMode_HardLight; update(); }
         void setSoftLightMode() { m_composition_mode = QPainter::CompositionMode_SoftLight; update(); }
         void setDifferenceMode() { m_composition_mode = QPainter::CompositionMode_Difference; update(); }
         void setExclusionMode() { m_composition_mode = QPainter::CompositionMode_Exclusion; update(); }

         void setCircleAlpha(int alpha) { m_circle_alpha = alpha; update(); }
         void setCircleColor(int hue) { m_circle_hue = hue; update(); }
         void setAnimationEnabled(bool enabled);

     private:
         void updateCirclePos();
         void drawBase(QPainter &p);
         void drawSource(QPainter &p);

         QPainter::CompositionMode m_composition_mode;

         QImage m_image;
         QImage m_buffer;
         QImage m_base_buffer;

         int m_circle_alpha;
         int m_circle_hue;

         QPointF m_circle_pos;
         QPointF m_offset;

         ObjectType m_current_object;
         bool m_animation_enabled;
         int m_animationTimer;

     #if QT_CONFIG(opengl)
         QScopedPointer<QFboPaintDevice> m_fbo;
         int m_pbuffer_size; // width==height==size of pbuffer
         uint m_base_tex;
         uint m_compositing_tex;
         QSize m_previous_size;
         QOpenGLTextureBlitter m_blitter;
     #endif
     };

     #endif // COMPOSITION_H