Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef CONTEXT2D_H
+#define CONTEXT2D_H
+
+#include "domimage.h"
+
+#include <QPainter>
+#include <QPainterPath>
+#include <QString>
+#include <QStack>
+#include <QMetaType>
+#include <QTimerEvent>
+
+// [3]
+class CanvasGradient
+{
+public:
+    CanvasGradient(const QGradient &v)
+        : value(v) {}
+    CanvasGradient() {}
+
+    QGradient value;
+};
+// [3]
+
+Q_DECLARE_METATYPE(CanvasGradient)
+Q_DECLARE_METATYPE(CanvasGradient*)
+
+class ImageData {
+};
+
+class QContext2DCanvas;
+
+//! [0]
+class Context2D : public QObject
+{
+    Q_OBJECT
+    // compositing
+    Q_PROPERTY(qreal globalAlpha READ globalAlpha WRITE setGlobalAlpha)
+    Q_PROPERTY(QString globalCompositeOperation READ globalCompositeOperation WRITE setGlobalCompositeOperation)
+    Q_PROPERTY(QVariant strokeStyle READ strokeStyle WRITE setStrokeStyle)
+    Q_PROPERTY(QVariant fillStyle READ fillStyle WRITE setFillStyle)
+    // line caps/joins
+    Q_PROPERTY(qreal lineWidth READ lineWidth WRITE setLineWidth)
+    Q_PROPERTY(QString lineCap READ lineCap WRITE setLineCap)
+    Q_PROPERTY(QString lineJoin READ lineJoin WRITE setLineJoin)
+    Q_PROPERTY(qreal miterLimit READ miterLimit WRITE setMiterLimit)
+    // shadows
+    Q_PROPERTY(qreal shadowOffsetX READ shadowOffsetX WRITE setShadowOffsetX)
+    Q_PROPERTY(qreal shadowOffsetY READ shadowOffsetY WRITE setShadowOffsetY)
+    Q_PROPERTY(qreal shadowBlur READ shadowBlur WRITE setShadowBlur)
+    Q_PROPERTY(QString shadowColor READ shadowColor WRITE setShadowColor)
+//! [0]
+
+public:
+    Context2D(QObject *parent = 0);
+    void setSize(int width, int height);
+    void setSize(const QSize &size);
+    QSize size() const;
+
+    void clear();
+    void reset();
+
+    // compositing
+    qreal globalAlpha() const; // (default 1.0)
+    QString globalCompositeOperation() const; // (default over)
+    QVariant strokeStyle() const; // (default black)
+    QVariant fillStyle() const; // (default black)
+
+    void setGlobalAlpha(qreal alpha);
+    void setGlobalCompositeOperation(const QString &op);
+    void setStrokeStyle(const QVariant &style);
+    void setFillStyle(const QVariant &style);
+
+    // line caps/joins
+    qreal lineWidth() const; // (default 1)
+    QString lineCap() const; // "butt", "round", "square" (default "butt")
+    QString lineJoin() const; // "round", "bevel", "miter" (default "miter")
+    qreal miterLimit() const; // (default 10)
+
+    void setLineWidth(qreal w);
+    void setLineCap(const QString &s);
+    void setLineJoin(const QString &s);
+    void setMiterLimit(qreal m);
+
+    // shadows
+    qreal shadowOffsetX() const; // (default 0)
+    qreal shadowOffsetY() const; // (default 0)
+    qreal shadowBlur() const; // (default 0)
+    QString shadowColor() const; // (default black)
+
+    void setShadowOffsetX(qreal x);
+    void setShadowOffsetY(qreal y);
+    void setShadowBlur(qreal b);
+    void setShadowColor(const QString &str);
+
+//! [1]
+public slots:
+    void save(); // push state on state stack
+    void restore(); // pop state stack and restore state
+
+    void scale(qreal x, qreal y);
+    void rotate(qreal angle);
+    void translate(qreal x, qreal y);
+    void transform(qreal m11, qreal m12, qreal m21, qreal m22,
+                   qreal dx, qreal dy);
+    void setTransform(qreal m11, qreal m12, qreal m21, qreal m22,
+                      qreal dx, qreal dy);
+
+    CanvasGradient createLinearGradient(qreal x0, qreal y0,
+                                        qreal x1, qreal y1);
+    CanvasGradient createRadialGradient(qreal x0, qreal y0,
+                                        qreal r0, qreal x1,
+                                        qreal y1, qreal r1);
+
+    // rects
+    void clearRect(qreal x, qreal y, qreal w, qreal h);
+    void fillRect(qreal x, qreal y, qreal w, qreal h);
+    void strokeRect(qreal x, qreal y, qreal w, qreal h);
+
+    // path API
+    void beginPath();
+    void closePath();
+    void moveTo(qreal x, qreal y);
+    void lineTo(qreal x, qreal y);
+    void quadraticCurveTo(qreal cpx, qreal cpy, qreal x, qreal y);
+    void bezierCurveTo(qreal cp1x, qreal cp1y,
+                       qreal cp2x, qreal cp2y, qreal x, qreal y);
+    void arcTo(qreal x1, qreal y1, qreal x2, qreal y2, qreal radius);
+    void rect(qreal x, qreal y, qreal w, qreal h);
+    void arc(qreal x, qreal y, qreal radius,
+             qreal startAngle, qreal endAngle,
+             bool anticlockwise);
+    void fill();
+    void stroke();
+    void clip();
+    bool isPointInPath(qreal x, qreal y) const;
+//! [1]
+
+    // drawing images
+    void drawImage(DomImage *image, qreal dx, qreal dy);
+    void drawImage(DomImage *image, qreal dx, qreal dy,
+                   qreal dw, qreal dh);
+    void drawImage(DomImage *image, qreal sx, qreal sy,
+                   qreal sw, qreal sh, qreal dx, qreal dy,
+                   qreal dw, qreal dh);
+
+    // pixel manipulation
+    ImageData getImageData(qreal sx, qreal sy, qreal sw, qreal sh);
+    void putImageData(ImageData image, qreal dx, qreal dy);
+
+//! [2]
+signals:
+    void changed(const QImage &image);
+//! [2]
+
+protected:
+    void timerEvent(QTimerEvent *e);
+
+private:
+    void beginPainting();
+    const QImage &endPainting();
+    void scheduleChange();
+
+    int m_changeTimerId;
+    QImage  m_image;
+    QPainter m_painter;
+    QPainterPath m_path;
+
+    enum DirtyFlag {
+        DirtyTransformationMatrix = 0x00001,
+        DirtyClippingRegion       = 0x00002,
+        DirtyStrokeStyle          = 0x00004,
+        DirtyFillStyle            = 0x00008,
+        DirtyGlobalAlpha          = 0x00010,
+        DirtyLineWidth            = 0x00020,
+        DirtyLineCap              = 0x00040,
+        DirtyLineJoin             = 0x00080,
+        DirtyMiterLimit           = 0x00100,
+        MDirtyPen                 = DirtyStrokeStyle
+                                  | DirtyLineWidth
+                                  | DirtyLineCap
+                                  | DirtyLineJoin
+                                  | DirtyMiterLimit,
+        DirtyShadowOffsetX        = 0x00200,
+        DirtyShadowOffsetY        = 0x00400,
+        DirtyShadowBlur           = 0x00800,
+        DirtyShadowColor          = 0x01000,
+        DirtyGlobalCompositeOperation = 0x2000,
+        DirtyFont                 = 0x04000,
+        DirtyTextAlign            = 0x08000,
+        DirtyTextBaseline         = 0x10000,
+        AllIsFullOfDirt           = 0xfffff
+    };
+
+    struct State {
+        State() : flags(0) {}
+        QMatrix matrix;
+        QPainterPath clipPath;
+        QBrush strokeStyle;
+        QBrush fillStyle;
+        qreal globalAlpha;
+        qreal lineWidth;
+        Qt::PenCapStyle lineCap;
+        Qt::PenJoinStyle lineJoin;
+        qreal miterLimit;
+        qreal shadowOffsetX;
+        qreal shadowOffsetY;
+        qreal shadowBlur;
+        QColor shadowColor;
+        QPainter::CompositionMode globalCompositeOperation;
+        QFont font;
+        int textAlign;
+        int textBaseline;
+        int flags;
+    };
+    State m_state;
+    QStack<State> m_stateStack;
+};
+
+#endif