composition.h Example File | Qt Widgets 5.12.6

Qt 5.12 | Qt Widgets | Composition Modes | composition.h Example File

Qt 5.12.6 Reference Documentation

# composition.h Example File

painting/composition/composition.h

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      #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