Home · All Classes · Main Classes · Grouped Classes · Modules · Functions

composition.h Example File
^{demos/composition/composition.h}

 /****************************************************************************
 **
 ** Copyright (C) 2005-2008 Trolltech ASA. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.2, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/. If
** you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at [email protected].
**
** In addition, as a special exception, Trolltech, as the sole
** copyright holder for Qt Designer, grants users of the Qt/Eclipse
** Integration plug-in the right for the Qt/Eclipse Integration to
** link to functionality provided by Qt Designer and its related
** libraries.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not expressly
** granted herein.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

 #ifndef COMPOSITION_H
 #define COMPOSITION_H

 #include "arthurwidgets.h"

 #include <QPainter>
 #include <QEvent>

 class QPushButton;
 class QRadioButton;

 #ifdef QT_OPENGL_SUPPORT
 #include <QtOpenGL>
 #endif

 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;
 };

 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 *);

     void mousePressEvent(QMouseEvent *);
     void mouseMoveEvent(QMouseEvent *);
     void mouseReleaseEvent(QMouseEvent *);

     void setCirclePos(const QPointF &pos) { m_circle_pos = pos; update(); }

     QSize sizeHint() const { 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; }

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

 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;

 #ifdef QT_OPENGL_SUPPORT
     QGLPixelBuffer *m_pbuffer;
     GLuint m_base_tex;
     GLuint m_compositing_tex;
     int m_pbuffer_size; // width==height==size of pbuffer
     QSize m_previous_size;
 #endif
 };

 #endif // COMPOSITION_H