1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QQUICKCONTEXT2DTEXTURE_P_H
5#define QQUICKCONTEXT2DTEXTURE_P_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <private/qtquickglobal_p.h>
19
20QT_REQUIRE_CONFIG(quick_canvas);
21
22#include <QtQuick/qsgtexture.h>
23#include "qquickcanvasitem_p.h"
24#include "qquickcontext2d_p.h"
25#include <QtCore/QMutex>
26#include <QtCore/QWaitCondition>
27#include <QtCore/QThread>
28
29QT_BEGIN_NAMESPACE
30
31class QQuickContext2DTile;
32class QQuickContext2DCommandBuffer;
33
34class QQuickContext2DTexture : public QObject
35{
36 Q_OBJECT
37public:
38 class PaintEvent : public QEvent {
39 public:
40 PaintEvent(QQuickContext2DCommandBuffer *b) : QEvent(QEvent::Type(QEvent::User + 1)), buffer(b) {}
41 QQuickContext2DCommandBuffer *buffer;
42 };
43
44 class CanvasChangeEvent : public QEvent {
45 public:
46 CanvasChangeEvent(const QSize &cSize,
47 const QSize &tSize,
48 const QRect &cWindow,
49 const QRect &dRect,
50 bool sm,
51 bool aa)
52 : QEvent(QEvent::Type(QEvent::User + 2))
53 , canvasSize(cSize)
54 , tileSize(tSize)
55 , canvasWindow(cWindow)
56 , dirtyRect(dRect)
57 , smooth(sm)
58 , antialiasing(aa)
59 {
60 }
61 QSize canvasSize;
62 QSize tileSize;
63 QRect canvasWindow;
64 QRect dirtyRect;
65 bool smooth;
66 bool antialiasing;
67 };
68
69 QQuickContext2DTexture();
70 ~QQuickContext2DTexture();
71
72 virtual QQuickCanvasItem::RenderTarget renderTarget() const = 0;
73 static QRect tiledRect(const QRectF& window, const QSize& tileSize);
74
75 bool setCanvasSize(const QSize &size);
76 bool setTileSize(const QSize &size);
77 bool setCanvasWindow(const QRect& canvasWindow);
78 void setSmooth(bool smooth);
79 void setAntialiasing(bool antialiasing);
80 bool setDirtyRect(const QRect &dirtyRect);
81 bool canvasDestroyed();
82 void setOnCustomThread(bool is) { m_onCustomThread = is; }
83 bool isOnCustomThread() const { return m_onCustomThread; }
84
85 // Called during sync() on the scene graph thread while GUI is blocked.
86 virtual QSGTexture *textureForNextFrame(QSGTexture *lastFrame, QQuickWindow *window) = 0;
87 bool event(QEvent *e) override;
88
89Q_SIGNALS:
90 void textureChanged();
91
92public Q_SLOTS:
93 void canvasChanged(const QSize& canvasSize, const QSize& tileSize, const QRect& canvasWindow, const QRect& dirtyRect, bool smooth, bool antialiasing);
94 void paint(QQuickContext2DCommandBuffer *ccb);
95 void markDirtyTexture();
96 void setItem(QQuickCanvasItem* item);
97 virtual void grabImage(const QRectF& region = QRectF()) = 0;
98
99protected:
100 virtual QVector2D scaleFactor() const { return QVector2D(1, 1); }
101
102 void paintWithoutTiles(QQuickContext2DCommandBuffer *ccb);
103 virtual QPaintDevice* beginPainting() {m_painting = true; return nullptr; }
104 virtual void endPainting() {m_painting = false;}
105 virtual QQuickContext2DTile* createTile() const = 0;
106 virtual void compositeTile(QQuickContext2DTile* tile) = 0;
107
108 void clearTiles();
109 virtual QSize adjustedTileSize(const QSize &ts);
110 QRect createTiles(const QRect& window);
111
112 QList<QQuickContext2DTile*> m_tiles;
113 QQuickContext2D *m_context;
114 QSurface *m_surface;
115
116 QQuickContext2D::State m_state;
117
118 QQuickCanvasItem* m_item;
119 QSize m_canvasSize;
120 QSize m_tileSize;
121 QRect m_canvasWindow;
122 qreal m_canvasDevicePixelRatio;
123
124 QMutex m_mutex;
125 QWaitCondition m_condition;
126
127 uint m_canvasWindowChanged : 1;
128 uint m_dirtyTexture : 1;
129 uint m_smooth : 1;
130 uint m_antialiasing : 1;
131 uint m_tiledCanvas : 1;
132 uint m_painting : 1;
133 uint m_onCustomThread : 1; // Not GUI and not SGRender
134};
135
136class QSGPlainTexture;
137class QQuickContext2DImageTexture : public QQuickContext2DTexture
138{
139 Q_OBJECT
140
141public:
142 QQuickContext2DImageTexture();
143 ~QQuickContext2DImageTexture();
144
145 QQuickCanvasItem::RenderTarget renderTarget() const override;
146
147 QQuickContext2DTile* createTile() const override;
148 QPaintDevice* beginPainting() override;
149 void endPainting() override;
150 void compositeTile(QQuickContext2DTile* tile) override;
151
152 QSGTexture *textureForNextFrame(QSGTexture *lastFrame, QQuickWindow *window) override;
153
154public Q_SLOTS:
155 void grabImage(const QRectF& region = QRectF()) override;
156
157private:
158 QImage m_image;
159 QImage m_displayImage;
160 QPainter m_painter;
161};
162
163QT_END_NAMESPACE
164
165#endif // QQUICKCONTEXT2DTEXTURE_P_H
166

source code of qtdeclarative/src/quick/items/context2d/qquickcontext2dtexture_p.h