src/qt/include/qpixmap.h

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/****************************************************************************
** $Id: qt/qpixmap.h   3.3.8   edited Jan 11 14:38 $
**
** Definition of QPixmap class
**
** Created : 940501
**
** Copyright (C) 1992-2007 Trolltech ASA.  All rights reserved.
**
** This file is part of the kernel module of the Qt GUI Toolkit.
**
** This file may be distributed under the terms of the Q Public License
** as defined by Trolltech ASA of Norway and appearing in the file
** LICENSE.QPL included in the packaging of this file.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** Licensees holding valid Qt Enterprise Edition or Qt Professional Edition
** licenses may use this file in accordance with the Qt Commercial License
** Agreement provided with the Software.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** not clear to you.
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**********************************************************************/

#ifndef QPIXMAP_H
#define QPIXMAP_H

#ifndef QT_H
#include "qpaintdevice.h"
#include "qcolor.h" // char*->QColor conversion
#include "qstring.h" // char*->QString conversion
#include "qnamespace.h"
#endif // QT_H

class QGfx;
class QPixmapPrivate;

#if defined(Q_WS_WIN)
// Internal pixmap memory optimization class for Windows 9x
class QMultiCellPixmap;
#endif


class Q_EXPORT QPixmap : public QPaintDevice, public Qt
{
public:
    enum ColorMode { Auto, Color, Mono };
    enum Optimization { DefaultOptim, NoOptim, MemoryOptim=NoOptim,
                        NormalOptim, BestOptim };

    QPixmap();
    QPixmap( const QImage& image );
    QPixmap( int w, int h,  int depth = -1, Optimization = DefaultOptim );
    QPixmap( const QSize &, int depth = -1, Optimization = DefaultOptim );
#ifndef QT_NO_IMAGEIO
    QPixmap( const QString& fileName, const char *format=0,
             ColorMode mode=Auto );
    QPixmap( const QString& fileName, const char *format,
             int conversion_flags );
    QPixmap( const char *xpm[] ); // ### in 4.0, 'const char * const xpm[]'?
    QPixmap( const QByteArray &data );
#endif
    QPixmap( const QPixmap & );
   ~QPixmap();

    QPixmap    &operator=( const QPixmap & );
    QPixmap    &operator=( const QImage  & );

    bool        isNull()        const;

    int         width()         const { return data->w; }
    int         height()        const { return data->h; }
    QSize       size()          const { return QSize(data->w,data->h); }
    QRect       rect()          const { return QRect(0,0,data->w,data->h); }
    int         depth()         const { return data->d; }
    static int  defaultDepth();

    void        fill( const QColor &fillColor = Qt::white );
    void        fill( const QWidget *, int xofs, int yofs );
    void        fill( const QWidget *, const QPoint &ofs );
    void        resize( int width, int height );
    void        resize( const QSize & );

    const QBitmap *mask() const;
    void        setMask( const QBitmap & );
    bool        selfMask() const;
    bool        hasAlpha() const;
    bool        hasAlphaChannel() const;
#ifndef QT_NO_IMAGE_HEURISTIC_MASK
    QBitmap     createHeuristicMask( bool clipTight = TRUE ) const;
#endif
#ifndef QT_NO_MIME
    static QPixmap fromMimeSource( const QString& abs_name );
#endif
    static  QPixmap grabWindow( WId, int x=0, int y=0, int w=-1, int h=-1 );
    static  QPixmap grabWidget( QWidget * widget,
                                int x=0, int y=0, int w=-1, int h=-1 );

#ifndef QT_NO_PIXMAP_TRANSFORMATION
    QPixmap         xForm( const QWMatrix & ) const;
    static QWMatrix trueMatrix( const QWMatrix &, int w, int h );
#endif

    QImage      convertToImage() const;
    bool        convertFromImage( const QImage &, ColorMode mode=Auto );
    bool        convertFromImage( const QImage &, int conversion_flags );
#ifndef QT_NO_IMAGEIO
    static const char* imageFormat( const QString &fileName );
    bool        load( const QString& fileName, const char *format=0,
                      ColorMode mode=Auto );
    bool        load( const QString& fileName, const char *format,
                      int conversion_flags );
    bool        loadFromData( const uchar *buf, uint len,
                              const char* format=0,
                              ColorMode mode=Auto );
    bool        loadFromData( const uchar *buf, uint len,
                              const char* format,
                              int conversion_flags );
    bool        loadFromData( const QByteArray &data,
                              const char* format=0,
                              int conversion_flags=0 );
    bool        save( const QString& fileName, const char* format, int quality = -1 ) const;
    bool        save( QIODevice* device, const char* format, int quality = -1 ) const;
#endif

#if defined(Q_WS_WIN)
    HBITMAP     hbm()           const;
#endif

    int         serialNumber()  const;

    Optimization        optimization() const;
    void                setOptimization( Optimization );
    static Optimization defaultOptimization();
    static void         setDefaultOptimization( Optimization );

    virtual void detach();

    bool        isQBitmap() const;

#if defined(Q_WS_WIN)
    // These functions are internal and used by Windows 9x only
    bool        isMultiCellPixmap() const;
    HDC         multiCellHandle() const;
    HBITMAP     multiCellBitmap() const;
    int         multiCellOffset() const;
    int         allocCell();
    void        freeCell( bool = FALSE );
#endif

#if defined(Q_WS_QWS)
    virtual QGfx * graphicsContext(bool clip_children=TRUE) const;
    virtual unsigned char * scanLine(int) const;
    virtual int bytesPerLine() const;
    QRgb * clut() const;
    int numCols() const;
#elif defined(Q_WS_X11)
    static int x11SetDefaultScreen( int screen );
    void x11SetScreen( int screen );
#endif

#ifndef Q_QDOC
    Q_DUMMY_COMPARISON_OPERATOR(QPixmap)
#endif

protected:
    QPixmap( int w, int h, const uchar *data, bool isXbitmap );
    int metric( int ) const;

#if defined(Q_WS_WIN)
    struct QMCPI {                              // mem optim for win9x
        QMultiCellPixmap *mcp;
        int     offset;
    };
#endif

    struct QPixmapData : public QShared {       // internal pixmap data
        QCOORD  w, h;
        short   d;
        uint    uninit   : 1;
        uint    bitmap   : 1;
        uint    selfmask : 1;
#if defined(Q_WS_WIN)
        uint    mcp      : 1;
#endif
        int     ser_no;
        QBitmap *mask;
#if defined(Q_WS_WIN)
        QPixmap *maskpm;
        union {
            HBITMAP hbm;    // if mcp == FALSE
            QMCPI  *mcpi;   // if mcp == TRUE
        } hbm_or_mcpi;
        uchar *realAlphaBits;
#ifdef Q_OS_TEMP
        uchar* ppvBits; // Pointer to DIBSection bits
#endif
#elif defined(Q_WS_X11)
        void   *ximage;
        void   *maskgc;
        QPixmap *alphapm;
#elif defined(Q_WS_MAC)
        ColorTable *clut;
        QPixmap *alphapm;
#elif defined(Q_WS_QWS)
        int id; // ### should use QPaintDevice::hd, since it is there
        QRgb * clut;
        int numcols;
        int rw;
        int rh;
        bool hasAlpha;
#endif
        Optimization optim;
#if defined(Q_WS_WIN)
        HBITMAP old_hbm;
#endif
    } *data;
private:
#ifndef QT_NO_IMAGEIO
    bool doImageIO( QImageIO* io, int quality ) const;
#endif
    QPixmap( int w, int h, int depth, bool, Optimization );
    void        init( int, int, int, bool, Optimization );
    void        deref();
    QPixmap     copy( bool ignoreMask = FALSE ) const;
#if defined(Q_WS_WIN)
    void initAlphaPixmap( uchar *bytes, int length, struct tagBITMAPINFO *bmi );
    void convertToAlphaPixmap( bool initAlpha=TRUE );
    static void bitBltAlphaPixmap( QPixmap *dst, int dx, int dy,
                                   const QPixmap *src, int sx, int sy,
                                   int sw, int sh, bool useDstAlpha );
#endif
    static Optimization defOptim;
    friend Q_EXPORT void bitBlt( QPaintDevice *, int, int,
                                 const QPaintDevice *,
                                 int, int, int, int, RasterOp, bool );
    friend Q_EXPORT void bitBlt( QPaintDevice *, int, int,
                                 const QImage* src,
                                 int, int, int, int, int conversion_flags );
    friend Q_EXPORT void copyBlt( QPixmap *dst, int dx, int dy,
                                  const QPixmap *src, int sx, int sy,
                                  int sw, int sh );

#if defined(Q_WS_MAC)
    friend void unclippedScaledBitBlt(QPaintDevice *, int, int, int, int,
                                      const QPaintDevice *, int, int, int, int,
                                      Qt::RasterOp, bool, bool);
#endif

    friend class QBitmap;
    friend class QPaintDevice;
    friend class QPainter;
    friend class QGLWidget;
};


inline bool QPixmap::isNull() const
{
    return data->w == 0;
}

inline void QPixmap::fill( const QWidget *w, const QPoint &ofs )
{
    fill( w, ofs.x(), ofs.y() );
}

inline void QPixmap::resize( const QSize &s )
{
    resize( s.width(), s.height() );
}

inline const QBitmap *QPixmap::mask() const
{
    return data->mask;
}

inline bool QPixmap::selfMask() const
{
    return data->selfmask;
}

#if defined(Q_WS_WIN)
inline HBITMAP QPixmap::hbm() const
{
    return data->mcp ? 0 : data->hbm_or_mcpi.hbm;
}
#endif

inline int QPixmap::serialNumber() const
{
    return data->ser_no;
}

inline QPixmap::Optimization QPixmap::optimization() const
{
    return data->optim;
}

inline bool QPixmap::isQBitmap() const
{
    return data->bitmap;
}

#if defined(Q_WS_WIN)
inline bool QPixmap::isMultiCellPixmap() const
{
    return data->mcp;
}
#endif


/*****************************************************************************
  QPixmap stream functions
 *****************************************************************************/

#if !defined(QT_NO_DATASTREAM) && !defined(QT_NO_IMAGEIO)
Q_EXPORT QDataStream &operator<<( QDataStream &, const QPixmap & );
Q_EXPORT QDataStream &operator>>( QDataStream &, QPixmap & );
#endif

/*****************************************************************************
  QPixmap (and QImage) helper functions
 *****************************************************************************/

#ifndef QT_NO_PIXMAP_TRANSFORMATION
#  define QT_XFORM_TYPE_MSBFIRST 0
#  define QT_XFORM_TYPE_LSBFIRST 1
#  if defined(Q_WS_WIN)
#    define QT_XFORM_TYPE_WINDOWSPIXMAP 2
#  endif
bool qt_xForm_helper( const QWMatrix&, int, int, int, uchar*, int, int, int, uchar*, int, int, int );
#endif

Q_EXPORT void copyBlt( QPixmap *dst, int dx, int dy,
                       const QPixmap *src, int sx = 0, int sy = 0,
                       int sw = -1, int sh = -1 );

#endif // QPIXMAP_H