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****************************************************************************/

#ifndef QQUICKCANVASITEM_P_H
#define QQUICKCANVASITEM_P_H

#include <QtQuick/qquickitem.h>
#include <private/qv8engine_p.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

class QQuickContext2D;
class QQuickCanvasItemPrivate;
class Q_QUICK_EXPORT QQuickCanvasItem : public QQuickItem
{
    Q_OBJECT
    Q_ENUMS(RenderTarget)
    Q_ENUMS(ImageFilterMode)

    Q_PROPERTY(QSizeF canvasSize READ canvasSize WRITE setCanvasSize NOTIFY canvasSizeChanged)
    Q_PROPERTY(QSize tileSize READ tileSize WRITE setTileSize NOTIFY tileSizeChanged)
    Q_PROPERTY(QRectF canvasWindow READ canvasWindow WRITE setCanvasWindow NOTIFY canvasWindowChanged)
    Q_PROPERTY(bool renderInThread READ renderInThread WRITE setRenderInThread NOTIFY renderInThreadChanged)
    Q_PROPERTY(RenderTarget renderTarget READ renderTarget WRITE setRenderTarget NOTIFY renderTargetChanged)
public:
    enum RenderTarget {
        Image,
        FramebufferObject
    };

    enum ImageFilterMode {
        Threshold,
        Mono,
        GrayScale,
        Brightness,
        Invert,
        Blur,
        Opaque,
        Convolute
    };

    QQuickCanvasItem(QQuickItem *parent = 0);
    ~QQuickCanvasItem();

    QSizeF canvasSize() const;
    void setCanvasSize(const QSizeF &);

    QSize tileSize() const;
    void setTileSize(const QSize &);

    QRectF canvasWindow() const;
    void setCanvasWindow(const QRectF& rect);

    bool renderInThread() const;
    void setRenderInThread(bool renderInThread);

    RenderTarget renderTarget() const;
    void setRenderTarget(RenderTarget target);

    QQuickContext2D* context() const;
    QImage toImage(const QRectF& region = QRectF()) const;

    QImage loadedImage(const QUrl& url);

Q_SIGNALS:
    void paint(QDeclarativeV8Handle context, const QRect &region);
    void painted();
    void canvasSizeChanged();
    void tileSizeChanged();
    void renderInThreadChanged();
    void textureChanged();
    void canvasWindowChanged();
    void renderTargetChanged();
    void imageLoaded();
public Q_SLOTS:
    QString toDataURL(const QString& type = QLatin1String("image/png")) const;
    QDeclarativeV8Handle getContext(const QString & = QLatin1String("2d"));
    void markDirty(const QRectF& region);
    void requestPaint() {markDirty(canvasWindow());}
    // Save current canvas to disk
    bool save(const QString& filename) const;
    void loadImage(const QUrl& url);
    void unloadImage(const QUrl& url);
    bool isImageLoaded(const QUrl& url) const;
    bool isImageLoading(const QUrl& url) const;
    bool isImageError(const QUrl& url) const;
private Q_SLOTS:
    void _doPainting(const QRectF& region);
protected:
    virtual void componentComplete();
    virtual QSGNode *updatePaintNode(QSGNode *, UpdatePaintNodeData *);
    virtual void geometryChanged(const QRectF &newGeometry,
                                 const QRectF &oldGeometry);
    virtual void updatePolish();
private:
    void createContext();
    void createTexture();
    Q_DECLARE_PRIVATE(QQuickCanvasItem)
    friend class QQuickContext2D;
    friend class QQuickContext2DTexture;
};
QT_END_NAMESPACE

QML_DECLARE_TYPE(QQuickCanvasItem)

QT_END_HEADER

#endif //QQUICKCANVASITEM_P_H