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

# composition.h Example File
demos/composition/composition.h

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the demonstration applications of the Qt Toolkit.
    **
    ** Licensees holding valid Qt Preview licenses may use this file in
    ** accordance with the Qt Preview License Agreement provided with the
    ** Software.
    **
    ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
    ** information about Qt Commercial License Agreements.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
    **
    ** 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