wxWidgets/include/wx/image.h

/////////////////////////////////////////////////////////////////////////////
// Name:        image.h
// Purpose:     wxImage class
// Author:      Robert Roebling
// RCS-ID:      $Id$
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_IMAGE_H_
#define _WX_IMAGE_H_

#ifdef __GNUG__
#pragma interface "image.h"
#endif

#include "wx/setup.h"
#include "wx/object.h"
#include "wx/string.h"
#include "wx/gdicmn.h"
#include "wx/bitmap.h"

#if wxUSE_STREAMS
#  include "wx/stream.h"
#endif

//-----------------------------------------------------------------------------
// classes
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxImageHandler;
class WXDLLEXPORT wxImage;

//-----------------------------------------------------------------------------
// wxImageHandler
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxImageHandler: public wxObject
{
public:
    wxImageHandler() { m_name = ""; m_extension = ""; m_type = 0; }

#if wxUSE_STREAMS
    virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE, int index=0 );
    virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );

    virtual int GetImageCount( wxInputStream& stream );

    bool CanRead( wxInputStream& stream ) { return DoCanRead(stream); }
    bool CanRead( const wxString& name );
#endif // wxUSE_STREAMS

    void SetName(const wxString& name) { m_name = name; }
    void SetExtension(const wxString& ext) { m_extension = ext; }
    void SetType(long type) { m_type = type; }
    void SetMimeType(const wxString& type) { m_mime = type; }
    wxString GetName() const { return m_name; }
    wxString GetExtension() const { return m_extension; }
    long GetType() const { return m_type; }
    wxString GetMimeType() const { return m_mime; }

protected:
#if wxUSE_STREAMS
    virtual bool DoCanRead( wxInputStream& stream ) = 0;
#endif // wxUSE_STREAMS

    wxString  m_name;
    wxString  m_extension;
    wxString  m_mime;
    long      m_type;
    
private:
    DECLARE_CLASS(wxImageHandler)
};

//-----------------------------------------------------------------------------
// wxImage
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxHNode
{
public:
    unsigned long index;
    unsigned long value;
};

class WXDLLEXPORT wxImage: public wxObject
{
public:
    wxImage();
    wxImage( int width, int height );
    wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY );
    wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
    wxImage( const wxString& name, const wxString& mimetype );
    wxImage( wxInputStream& stream, const wxString& mimetype );

    wxImage( const wxImage& image );
    wxImage( const wxImage* image );

    // these functions get implemented in /src/(platform)/bitmap.cpp
    wxImage( const wxBitmap &bitmap );
    operator wxBitmap() const { return ConvertToBitmap(); }
    wxBitmap ConvertToBitmap() const;
#ifdef __WXGTK__
    wxBitmap ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue );
#endif

    void Create( int width, int height );
    void Destroy();

    // return the new image with size width*height
    wxImage GetSubImage( const wxRect& ) const;

    // return the new image with size width*height
    wxImage Scale( int width, int height ) const;

    // rescales the image in place
    wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }

    // replace one colour with another
    void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
                  unsigned char r2, unsigned char g2, unsigned char b2 );

    // these routines are slow but safe
    void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
    unsigned char GetRed( int x, int y );
    unsigned char GetGreen( int x, int y );
    unsigned char GetBlue( int x, int y );

    static bool CanRead( const wxString& name );
    virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY );
    virtual bool LoadFile( const wxString& name, const wxString& mimetype );

#if wxUSE_STREAMS
    static bool CanRead( wxInputStream& stream );
    virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
    virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype );
#endif

    virtual bool SaveFile( const wxString& name, int type );
    virtual bool SaveFile( const wxString& name, const wxString& mimetype );

#if wxUSE_STREAMS
    virtual bool SaveFile( wxOutputStream& stream, int type );
    virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype );
#endif

    bool Ok() const;
    int GetWidth() const;
    int GetHeight() const;

    char unsigned *GetData() const;
    void SetData( char unsigned *data );

    void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
    unsigned char GetMaskRed() const;
    unsigned char GetMaskGreen() const;
    unsigned char GetMaskBlue() const;
    void SetMask( bool mask = TRUE );
    bool HasMask() const;

    unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 );
    unsigned long ComputeHistogram( wxHashTable &h );

    wxImage& operator = (const wxImage& image)
    {
        if ( (*this) != image )
            Ref(image);
        return *this;
    }

    bool operator == (const wxImage& image)
        { return m_refData == image.m_refData; }
    bool operator != (const wxImage& image)
        { return m_refData != image.m_refData; }

    static wxList& GetHandlers() { return sm_handlers; }
    static void AddHandler( wxImageHandler *handler );
    static void InsertHandler( wxImageHandler *handler );
    static bool RemoveHandler( const wxString& name );
    static wxImageHandler *FindHandler( const wxString& name );
    static wxImageHandler *FindHandler( const wxString& extension, long imageType );
    static wxImageHandler *FindHandler( long imageType );
    static wxImageHandler *FindHandlerMime( const wxString& mimetype );

    static void CleanUpHandlers();
    static void InitStandardHandlers();

protected:
    static wxList sm_handlers;

private:
    friend class WXDLLEXPORT wxImageHandler;

    DECLARE_DYNAMIC_CLASS(wxImage)
};


extern void WXDLLEXPORT wxInitAllImageHandlers();


//-----------------------------------------------------------------------------
// wxImage handlers
//-----------------------------------------------------------------------------

#include "wx/imagbmp.h"
#include "wx/imagpng.h"
#include "wx/imaggif.h"
#include "wx/imagpcx.h"
#include "wx/imagjpeg.h"
#include "wx/imagtiff.h"
#include "wx/imagpnm.h"

#endif
  // _WX_IMAGE_H_