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 QQUICKCONTEXT2D_P_H
5#define QQUICKCONTEXT2D_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 <QtQml/qqml.h>
23#include <QtQml/qqmlcomponent.h>
24#include <private/qquickcanvascontext_p.h>
25#include <private/qquickcanvasitem_p.h>
26#include <QtGui/qpainter.h>
27#include <QtGui/qpainterpath.h>
28#include <QtGui/qoffscreensurface.h>
29#include <QtCore/qstring.h>
30#include <QtCore/qstack.h>
31#include <QtCore/qqueue.h>
32#include <QtCore/QWaitCondition>
33
34#include <private/qv4persistent_p.h>
35
36//#define QQUICKCONTEXT2D_DEBUG //enable this for just DEBUG purpose!
37
38#ifdef QQUICKCONTEXT2D_DEBUG
39#include <QElapsedTimer>
40#endif
41
42QT_BEGIN_NAMESPACE
43
44namespace QV4 {
45 struct ExecutionEngine;
46}
47
48class QQuickContext2DCommandBuffer;
49class QQuickContext2DTexture;
50class QQuickPixmap;
51class QSGTexture;
52class QSurface;
53
54class QQuickContext2D : public QQuickCanvasContext
55{
56 Q_OBJECT
57
58public:
59 Q_DISABLE_COPY(QQuickContext2D)
60
61 enum TextBaseLineType { Alphabetic=0, Top, Middle, Bottom, Hanging};
62 enum TextAlignType { Start=0, End, Left, Right, Center};
63 enum PaintCommand {
64 Invalid = 0,
65 UpdateMatrix,
66 ClearRect,
67 FillRect,
68 StrokeRect,
69 Fill,
70 Stroke,
71 Clip,
72 UpdateBrush,
73 GlobalAlpha,
74 GlobalCompositeOperation,
75 StrokeStyle,
76 FillStyle,
77 LineWidth,
78 LineCap,
79 LineJoin,
80 LineDash,
81 LineDashOffset,
82 MiterLimit,
83 ShadowOffsetX,
84 ShadowOffsetY,
85 ShadowBlur,
86 ShadowColor,
87 Font,
88 TextBaseline,
89 TextAlign,
90 FillText,
91 StrokeText,
92 DrawImage,
93 DrawPixmap,
94 GetImageData
95 };
96
97 struct State {
98 State()
99 : strokeStyle(QColor(Qt::black))
100 , fillStyle(QColor(Qt::black))
101 , fillPatternRepeatX(false)
102 , fillPatternRepeatY(false)
103 , strokePatternRepeatX(false)
104 , strokePatternRepeatY(false)
105 , invertibleCTM(true)
106 , clip(false)
107 , fillRule(Qt::WindingFill)
108 , globalAlpha(1.0)
109 , lineWidth(1)
110 , lineCap(Qt::FlatCap)
111 , lineJoin(Qt::MiterJoin)
112 , lineDashOffset(0)
113 , miterLimit(10)
114 , shadowOffsetX(0)
115 , shadowOffsetY(0)
116 , shadowBlur(0)
117 , shadowColor(qRgba(r: 0, g: 0, b: 0, a: 0))
118 , globalCompositeOperation(QPainter::CompositionMode_SourceOver)
119 , font(QFont(QLatin1String("sans-serif")))
120 , textAlign(QQuickContext2D::Start)
121 , textBaseline(QQuickContext2D::Alphabetic)
122 {
123 font.setPixelSize(10);
124 }
125
126 QTransform matrix;
127 QPainterPath clipPath;
128 QBrush strokeStyle;
129 QBrush fillStyle;
130 bool fillPatternRepeatX:1;
131 bool fillPatternRepeatY:1;
132 bool strokePatternRepeatX:1;
133 bool strokePatternRepeatY:1;
134 bool invertibleCTM:1;
135 bool clip:1;
136 Qt::FillRule fillRule;
137 qreal globalAlpha;
138 qreal lineWidth;
139 Qt::PenCapStyle lineCap;
140 Qt::PenJoinStyle lineJoin;
141 QVector<qreal> lineDash;
142 qreal lineDashOffset;
143 qreal miterLimit;
144 qreal shadowOffsetX;
145 qreal shadowOffsetY;
146 qreal shadowBlur;
147 QColor shadowColor;
148 QPainter::CompositionMode globalCompositeOperation;
149 QFont font;
150 QQuickContext2D::TextAlignType textAlign;
151 QQuickContext2D::TextBaseLineType textBaseline;
152 };
153
154 QQuickContext2D(QObject *parent = nullptr);
155 ~QQuickContext2D();
156
157 QStringList contextNames() const override;
158 void init(QQuickCanvasItem *canvasItem, const QVariantMap &args) override;
159 void prepare(const QSize& canvasSize, const QSize& tileSize, const QRect& canvasWindow, const QRect& dirtyRect, bool smooth, bool antialiasing) override;
160 void flush() override;
161 void sync();
162 QThread *thread() const { return m_thread; }
163 QQuickContext2DTexture *texture() const;
164 QImage toImage(const QRectF& bounds) override;
165
166 QV4::ReturnedValue v4value() const override;
167 QV4::ExecutionEngine *v4Engine() const override;
168 void setV4Engine(QV4::ExecutionEngine *eng) override;
169
170 QQuickCanvasItem* canvas() const { return m_canvas; }
171 QQuickContext2DCommandBuffer* buffer() const { return m_buffer; }
172
173 bool bufferValid() const { return m_buffer != nullptr; }
174 void popState();
175 void pushState();
176 void reset();
177
178 void fill();
179 void clip();
180 void stroke();
181 void fillRect(qreal x, qreal y, qreal w, qreal h);
182 void strokeRect(qreal x, qreal y, qreal w, qreal h);
183 void clearRect(qreal x, qreal y, qreal w, qreal h);
184 void drawText(const QString& text, qreal x, qreal y, bool fill);
185
186 //Transform APIs
187 void scale(qreal x, qreal y);
188 void rotate(qreal angle);
189 void shear(qreal h, qreal v);
190 void translate(qreal x, qreal y);
191 void transform(qreal a, qreal b, qreal c, qreal d, qreal e, qreal f);
192 void setTransform(qreal a, qreal b, qreal c, qreal d, qreal e, qreal f);
193
194 // Path APIs
195 void beginPath();
196 void closePath();
197 void moveTo(qreal x, qreal y);
198 void lineTo(qreal x, qreal y);
199 void quadraticCurveTo(qreal cpx, qreal cpy, qreal x, qreal y);
200 void bezierCurveTo(qreal cp1x, qreal cp1y,
201 qreal cp2x, qreal cp2y, qreal x, qreal y);
202 void arcTo(qreal x1, qreal y1, qreal x2, qreal y2, qreal radius);
203 void rect(qreal x, qreal y, qreal w, qreal h);
204 void roundedRect(qreal x, qreal y,qreal w, qreal h, qreal xr, qreal yr);
205 void ellipse(qreal x, qreal y,qreal w, qreal h);
206 void text(const QString& str, qreal x, qreal y);
207 void arc(qreal x, qreal y, qreal radius,
208 qreal startAngle, qreal endAngle,
209 bool anticlockwise);
210 void addArcTo(const QPointF& p1, const QPointF& p2, qreal radius);
211
212 bool isPointInPath(qreal x, qreal y) const;
213
214 QPainterPath createTextGlyphs(qreal x, qreal y, const QString& text);
215 QQmlRefPointer<QQuickCanvasPixmap> createPixmap(const QUrl& url, QSizeF sourceSize = QSizeF());
216
217 QSurface *surface() const { return m_surface.data(); }
218 void setGrabbedImage(const QImage& grab);
219
220 State state;
221 QStack<QQuickContext2D::State> m_stateStack;
222 QQuickCanvasItem* m_canvas;
223 QQuickContext2DCommandBuffer* m_buffer;
224 QPainterPath m_path;
225 QV4::PersistentValue m_fillStyle;
226 QV4::PersistentValue m_strokeStyle;
227 QV4::PersistentValue m_v4path;
228 QV4::ExecutionEngine *m_v4engine;
229 QScopedPointer<QOffscreenSurface> m_surface;
230 QV4::PersistentValue m_v4value;
231 QQuickContext2DTexture *m_texture;
232 QQuickCanvasItem::RenderTarget m_renderTarget;
233 QQuickCanvasItem::RenderStrategy m_renderStrategy;
234 QQueue<QQuickContext2DCommandBuffer*> m_bufferQueue;
235 QThread *m_thread;
236 QImage m_grabbedImage;
237 bool m_grabbed:1;
238
239 static QMutex mutex;
240};
241
242QT_END_NAMESPACE
243
244#endif // QQUICKCONTEXT2D_P_H
245

source code of qtdeclarative/src/quick/items/context2d/qquickcontext2d_p.h