path: root/src/gui/painting/qpaintengineex_p.h

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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** Public License version 3.0 as published by the Free Software Foundation
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****************************************************************************/

#ifndef QPAINTENGINEEX_P_H
#define QPAINTENGINEEX_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtGui/qpaintengine.h>
#include <QtGui/qdrawutil.h>

#include <private/qpaintengine_p.h>
#include <private/qstroker_p.h>
#include <private/qpainter_p.h>
#include <private/qvectorpath_p.h>


QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

QT_MODULE(Gui)

class QPainterState;
class QPaintEngineExPrivate;
class QStaticTextItem;
struct StrokeHandler;

struct QIntRect {
    int x1, y1, x2, y2;
    inline void set(const QRect &r) {
        x1 = r.x();
        y1 = r.y();
        x2 = r.right() + 1;
        y2 = r.bottom() + 1;
        // We will assume normalized for later...
        Q_ASSERT(x2 >= x1);
        Q_ASSERT(y2 >= y1);
    }
};

class QRectVectorPath : public QVectorPath {
public:
    inline void set(const QRect &r) {
        qreal left = r.x();
        qreal right = r.x() + r.width();
        qreal top = r.y();
        qreal bottom = r.y() + r.height();
        pts[0] = left;
        pts[1] = top;
        pts[2] = right;
        pts[3] = top;
        pts[4] = right;
        pts[5] = bottom;
        pts[6] = left;
        pts[7] = bottom;
    }

    inline void set(const QRectF &r) {
        qreal left = r.x();
        qreal right = r.x() + r.width();
        qreal top = r.y();
        qreal bottom = r.y() + r.height();
        pts[0] = left;
        pts[1] = top;
        pts[2] = right;
        pts[3] = top;
        pts[4] = right;
        pts[5] = bottom;
        pts[6] = left;
        pts[7] = bottom;
    }
    inline QRectVectorPath(const QRect &r)
        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    {
        set(r);
    }
    inline QRectVectorPath(const QRectF &r)
        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    {
        set(r);
    }
    inline QRectVectorPath()
        : QVectorPath(pts, 4, 0, QVectorPath::RectangleHint | QVectorPath::ImplicitClose)
    { }

    qreal pts[8];
};

#ifndef QT_NO_DEBUG_STREAM
QDebug Q_GUI_EXPORT &operator<<(QDebug &, const QVectorPath &path);
#endif

class QPixmapFilter;

class Q_GUI_EXPORT QPaintEngineEx : public QPaintEngine
{
    Q_DECLARE_PRIVATE(QPaintEngineEx)
public:
    QPaintEngineEx();

    virtual QPainterState *createState(QPainterState *orig) const;

    virtual void draw(const QVectorPath &path);
    virtual void fill(const QVectorPath &path, const QBrush &brush) = 0;
    virtual void stroke(const QVectorPath &path, const QPen &pen);

    virtual void clip(const QVectorPath &path, Qt::ClipOperation op) = 0;
    virtual void clip(const QRect &rect, Qt::ClipOperation op);
    virtual void clip(const QRegion &region, Qt::ClipOperation op);
    virtual void clip(const QPainterPath &path, Qt::ClipOperation op);

    virtual void clipEnabledChanged() = 0;
    virtual void penChanged() = 0;
    virtual void brushChanged() = 0;
    virtual void brushOriginChanged() = 0;
    virtual void opacityChanged() = 0;
    virtual void compositionModeChanged() = 0;
    virtual void renderHintsChanged() = 0;
    virtual void transformChanged() = 0;

    virtual void fillRect(const QRectF &rect, const QBrush &brush);
    virtual void fillRect(const QRectF &rect, const QColor &color);

    virtual void drawRoundedRect(const QRectF &rect, qreal xrad, qreal yrad, Qt::SizeMode mode);

    virtual void drawRects(const QRect *rects, int rectCount);
    virtual void drawRects(const QRectF *rects, int rectCount);

    virtual void drawLines(const QLine *lines, int lineCount);
    virtual void drawLines(const QLineF *lines, int lineCount);

    virtual void drawEllipse(const QRectF &r);
    virtual void drawEllipse(const QRect &r);

    virtual void drawPath(const QPainterPath &path);

    virtual void drawPoints(const QPointF *points, int pointCount);
    virtual void drawPoints(const QPoint *points, int pointCount);

    virtual void drawPolygon(const QPointF *points, int pointCount, PolygonDrawMode mode);
    virtual void drawPolygon(const QPoint *points, int pointCount, PolygonDrawMode mode);

    virtual void drawPixmap(const QRectF &r, const QPixmap &pm, const QRectF &sr) = 0;
    virtual void drawPixmap(const QPointF &pos, const QPixmap &pm);

    virtual void drawImage(const QRectF &r, const QImage &pm, const QRectF &sr,
                           Qt::ImageConversionFlags flags = Qt::AutoColor) = 0;
    virtual void drawImage(const QPointF &pos, const QImage &image);

    virtual void drawTiledPixmap(const QRectF &r, const QPixmap &pixmap, const QPointF &s);

    virtual void drawPixmapFragments(const QPainter::PixmapFragment *fragments, int fragmentCount, const QPixmap &pixmap,
                                     QFlags<QPainter::PixmapFragmentHint> hints);

    virtual void updateState(const QPaintEngineState &state);

    virtual void drawStaticTextItem(QStaticTextItem *);

    virtual void setState(QPainterState *s);
    inline QPainterState *state() { return static_cast<QPainterState *>(QPaintEngine::state); }
    inline const QPainterState *state() const { return static_cast<const QPainterState *>(QPaintEngine::state); }

    virtual void sync() {}

    virtual void beginNativePainting() {}
    virtual void endNativePainting() {}

    // Return a pixmap filter of "type" that can render the parameters
    // in "prototype".  The returned filter is owned by the engine and
    // will be destroyed when the engine is destroyed.  The "prototype"
    // allows the engine to pick different filters based on the parameters
    // that will be requested, and not just the "type".
    virtual QPixmapFilter *pixmapFilter(int /*type*/, const QPixmapFilter * /*prototype*/) { return 0; }

    // These flags are needed in the implementation of paint buffers.
    enum Flags
    {
        DoNotEmulate = 0x01,        // If set, QPainter will not wrap this engine in an emulation engine.
        IsEmulationEngine = 0x02    // If set, this object is a QEmulationEngine.
    };
    virtual uint flags() const {return 0;}
    virtual bool supportsTransformations(qreal pixelSize, const QTransform &m) const;
    virtual bool shouldDrawCachedGlyphs(qreal pixelSize, const QTransform &m) const;

protected:
    QPaintEngineEx(QPaintEngineExPrivate &data);
};

class Q_GUI_EXPORT QPaintEngineExPrivate : public QPaintEnginePrivate
{
    Q_DECLARE_PUBLIC(QPaintEngineEx)
public:
    QPaintEngineExPrivate();
    ~QPaintEngineExPrivate();

    void replayClipOperations();
    bool hasClipOperations() const;

    QStroker stroker;
    QDashStroker dasher;
    StrokeHandler *strokeHandler;
    QStrokerOps *activeStroker;
    QPen strokerPen;

    QRect exDeviceRect;
};

inline uint QVectorPath::polygonFlags(QPaintEngine::PolygonDrawMode mode) {
    switch (mode) {
    case QPaintEngine::ConvexMode: return ConvexPolygonHint | ImplicitClose;
    case QPaintEngine::OddEvenMode: return PolygonHint | OddEvenFill | ImplicitClose;
    case QPaintEngine::WindingMode: return PolygonHint | WindingFill | ImplicitClose;
    case QPaintEngine::PolylineMode: return PolygonHint;
    default: return 0;
    }
}

QT_END_NAMESPACE

QT_END_HEADER

#endif