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50
51#ifndef COMPOSITION_H
52#define COMPOSITION_H
53
54#include "arthurwidgets.h"
55
56#if QT_CONFIG(opengl)
57#include "fbopaintdevice.h"
58#include <QOpenGLTextureBlitter>
59#endif
60
61#include <QPainter>
62#include <QEvent>
63
64#include <memory>
65
66QT_BEGIN_NAMESPACE
67class QPushButton;
68class QRadioButton;
69QT_END_NAMESPACE
70
71class CompositionWidget : public QWidget
72{
73 Q_OBJECT
74
75public:
76 explicit CompositionWidget(QWidget *parent = nullptr);
77 ~CompositionWidget();
78
79public slots:
80void nextMode();
81
82private:
83 bool m_cycle_enabled;
84
85 QRadioButton *rbClear;
86 QRadioButton *rbSource;
87 QRadioButton *rbDest;
88 QRadioButton *rbSourceOver;
89 QRadioButton *rbDestOver;
90 QRadioButton *rbSourceIn;
91 QRadioButton *rbDestIn;
92 QRadioButton *rbSourceOut;
93 QRadioButton *rbDestOut;
94 QRadioButton *rbSourceAtop;
95 QRadioButton *rbDestAtop;
96 QRadioButton *rbXor;
97
98 QRadioButton *rbPlus;
99 QRadioButton *rbMultiply;
100 QRadioButton *rbScreen;
101 QRadioButton *rbOverlay;
102 QRadioButton *rbDarken;
103 QRadioButton *rbLighten;
104 QRadioButton *rbColorDodge;
105 QRadioButton *rbColorBurn;
106 QRadioButton *rbHardLight;
107 QRadioButton *rbSoftLight;
108 QRadioButton *rbDifference;
109 QRadioButton *rbExclusion;
110};
111
112class CompositionRenderer : public ArthurFrame
113{
114 Q_OBJECT
115
116 enum ObjectType { NoObject, Circle, Rectangle, Image };
117
118 Q_PROPERTY(int circleColor READ circleColor WRITE setCircleColor)
119 Q_PROPERTY(int circleAlpha READ circleAlpha WRITE setCircleAlpha)
120 Q_PROPERTY(bool animation READ animationEnabled WRITE setAnimationEnabled)
121
122public:
123 explicit CompositionRenderer(QWidget *parent = nullptr);
124 ~CompositionRenderer();
125
126 void paint(QPainter *) override;
127
128 void setCirclePos(const QPointF &pos);
129
130 QSize sizeHint() const override { return QSize(500, 400); }
131
132 bool animationEnabled() const { return m_animation_enabled; }
133 int circleColor() const { return m_circle_hue; }
134 int circleAlpha() const { return m_circle_alpha; }
135
136protected:
137 void mousePressEvent(QMouseEvent *) override;
138 void mouseMoveEvent(QMouseEvent *) override;
139 void mouseReleaseEvent(QMouseEvent *) override;
140 void timerEvent(QTimerEvent *) override;
141
142public slots:
143 void setClearMode() { m_composition_mode = QPainter::CompositionMode_Clear; update(); }
144 void setSourceMode() { m_composition_mode = QPainter::CompositionMode_Source; update(); }
145 void setDestMode() { m_composition_mode = QPainter::CompositionMode_Destination; update(); }
146 void setSourceOverMode() { m_composition_mode = QPainter::CompositionMode_SourceOver; update(); }
147 void setDestOverMode() { m_composition_mode = QPainter::CompositionMode_DestinationOver; update(); }
148 void setSourceInMode() { m_composition_mode = QPainter::CompositionMode_SourceIn; update(); }
149 void setDestInMode() { m_composition_mode = QPainter::CompositionMode_DestinationIn; update(); }
150 void setSourceOutMode() { m_composition_mode = QPainter::CompositionMode_SourceOut; update(); }
151 void setDestOutMode() { m_composition_mode = QPainter::CompositionMode_DestinationOut; update(); }
152 void setSourceAtopMode() { m_composition_mode = QPainter::CompositionMode_SourceAtop; update(); }
153 void setDestAtopMode() { m_composition_mode = QPainter::CompositionMode_DestinationAtop; update(); }
154 void setXorMode() { m_composition_mode = QPainter::CompositionMode_Xor; update(); }
155
156 void setPlusMode() { m_composition_mode = QPainter::CompositionMode_Plus; update(); }
157 void setMultiplyMode() { m_composition_mode = QPainter::CompositionMode_Multiply; update(); }
158 void setScreenMode() { m_composition_mode = QPainter::CompositionMode_Screen; update(); }
159 void setOverlayMode() { m_composition_mode = QPainter::CompositionMode_Overlay; update(); }
160 void setDarkenMode() { m_composition_mode = QPainter::CompositionMode_Darken; update(); }
161 void setLightenMode() { m_composition_mode = QPainter::CompositionMode_Lighten; update(); }
162 void setColorDodgeMode() { m_composition_mode = QPainter::CompositionMode_ColorDodge; update(); }
163 void setColorBurnMode() { m_composition_mode = QPainter::CompositionMode_ColorBurn; update(); }
164 void setHardLightMode() { m_composition_mode = QPainter::CompositionMode_HardLight; update(); }
165 void setSoftLightMode() { m_composition_mode = QPainter::CompositionMode_SoftLight; update(); }
166 void setDifferenceMode() { m_composition_mode = QPainter::CompositionMode_Difference; update(); }
167 void setExclusionMode() { m_composition_mode = QPainter::CompositionMode_Exclusion; update(); }
168
169 void setCircleAlpha(int alpha) { m_circle_alpha = alpha; update(); }
170 void setCircleColor(int hue) { m_circle_hue = hue; update(); }
171 void setAnimationEnabled(bool enabled);
172
173private:
174 void updateCirclePos();
175 void drawBase(QPainter &p);
176 void drawSource(QPainter &p);
177
178 QPainter::CompositionMode m_composition_mode;
179
180 QImage m_image;
181 QImage m_buffer;
182 QImage m_base_buffer;
183
184 int m_circle_alpha;
185 int m_circle_hue;
186
187 QPointF m_circle_pos;
188 QPointF m_offset;
189
190 ObjectType m_current_object;
191 bool m_animation_enabled;
192 int m_animationTimer;
193
194#if QT_CONFIG(opengl)
195 std::unique_ptr<QFboPaintDevice> m_fbo;
196 int m_pbuffer_size; // width==height==size of pbuffer
197 uint m_base_tex;
198 uint m_compositing_tex;
199 QSize m_previous_size;
200 QOpenGLTextureBlitter m_blitter;
201#endif
202};
203
204#endif // COMPOSITION_H
205

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source code of qtbase/examples/widgets/painting/composition/composition.h