image.h

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/////////////////////////////////////////////////////////////////////////////
// Name:        image.h
// Purpose:     wxImage class
// Author:      Robert Roebling
// RCS-ID:      $Id: image.h,v 1.108.2.2 2006/01/18 16:32:38 JS Exp $
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_IMAGE_H_
#define _WX_IMAGE_H_

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma interface "image.h"
#endif

#include "wx/defs.h"
#include "wx/object.h"
#include "wx/string.h"
#include "wx/gdicmn.h"
#include "wx/hashmap.h"

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

#if wxUSE_IMAGE

// on some systems (Unixware 7.x) index is defined as a macro in the headers
// which breaks the compilation below
#undef index

#define wxIMAGE_OPTION_QUALITY  wxString(_T("quality"))
#define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))

#define wxIMAGE_OPTION_RESOLUTION            wxString(_T("Resolution"))
#define wxIMAGE_OPTION_RESOLUTIONX           wxString(_T("ResolutionX"))
#define wxIMAGE_OPTION_RESOLUTIONY           wxString(_T("ResolutionY"))

#define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(_T("ResolutionUnit"))

// constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
enum
{
    wxIMAGE_RESOLUTION_INCHES = 1,
    wxIMAGE_RESOLUTION_CM = 2
};

// alpha channel values: fully transparent, default threshold separating
// transparent pixels from opaque for a few functions dealing with alpha and
// fully opaque
const unsigned char wxIMAGE_ALPHA_TRANSPARENT = 0;
const unsigned char wxIMAGE_ALPHA_THRESHOLD = 0x80;
const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;

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

class WXDLLEXPORT wxImageHandler;
class WXDLLEXPORT wxImage;
class WXDLLEXPORT wxPalette;

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

class WXDLLEXPORT wxImageHandler: public wxObject
{
public:
    wxImageHandler()
        : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(0)
        { }

#if wxUSE_STREAMS
    virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
    virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=true );

    virtual int GetImageCount( wxInputStream& stream );

    bool CanRead( wxInputStream& stream ) { return CallDoCanRead(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;

    // save the stream position, call DoCanRead() and restore the position
    bool CallDoCanRead(wxInputStream& stream);
#endif // wxUSE_STREAMS

    wxString  m_name;
    wxString  m_extension;
    wxString  m_mime;
    long      m_type;

private:
    DECLARE_CLASS(wxImageHandler)
};

//-----------------------------------------------------------------------------
// wxImageHistogram
//-----------------------------------------------------------------------------

class WXDLLEXPORT wxImageHistogramEntry
{
public:
    wxImageHistogramEntry() { index = value = 0; }
    unsigned long index;
    unsigned long value;
};

WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
                             wxIntegerHash, wxIntegerEqual,
                             wxImageHistogramBase);

class WXDLLEXPORT wxImageHistogram : public wxImageHistogramBase
{
public:
    wxImageHistogram() : wxImageHistogramBase(256) { }

    // get the key in the histogram for the given RGB values
    static unsigned long MakeKey(unsigned char r,
                                 unsigned char g,
                                 unsigned char b)
    {
        return (r << 16) | (g << 8) | b;
    }

    // find first colour that is not used in the image and has higher
    // RGB values than RGB(startR, startG, startB)
    //
    // returns true and puts this colour in r, g, b (each of which may be NULL)
    // on success or returns false if there are no more free colours
    bool FindFirstUnusedColour(unsigned char *r,
                               unsigned char *g,
                               unsigned char *b,
                               unsigned char startR = 1,
                               unsigned char startG = 0,
                               unsigned char startB = 0 ) const;
};

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

class WXDLLEXPORT wxImage: public wxObject
{
public:
#if wxABI_VERSION >= 20602
    // red, green and blue are 8 bit unsigned integers in the range of 0..255
    // We use the identifier RGBValue instead of RGB, since RGB is #defined
    class RGBValue
    {
    public:
      RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0)
        : red(r), green(g), blue(b) {}
        unsigned char red;  
        unsigned char green;
        unsigned char blue;
    };

    // hue, saturation and value are doubles in the range 0.0..1.0
    class HSVValue
    {
    public:
        HSVValue(double h=0.0, double s=0.0, double v=0.0)
            : hue(h), saturation(s), value(v) {}
        double hue;  
        double saturation;
        double value;
    };
#endif // wxABI_VERSION >= 2.6.2

    wxImage(){}
    wxImage( int width, int height, bool clear = true );
    wxImage( int width, int height, unsigned char* data, bool static_data = false );
    wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
    wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
    wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
    wxImage( const char** xpmData );
    wxImage( char** xpmData );

#if wxUSE_STREAMS
    wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
    wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
#endif // wxUSE_STREAMS

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

    bool Create( int width, int height, bool clear = true );
    bool Create( int width, int height, unsigned char* data, bool static_data = false );
    bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
    bool Create( const char** xpmData );
    void Destroy();

    // creates an identical copy of the image (the = operator
    // just raises the ref count)
    wxImage Copy() const;

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

    // Paste the image or part of this image into an image of the given size at the pos
    //  any newly exposed areas will be filled with the rgb colour
    //  by default if r = g = b = -1 then fill with this image's mask colour or find and
    //  set a suitable mask colour
    wxImage Size( const wxSize& size, const wxPoint& pos,
                  int r = -1, int g = -1, int b = -1 ) const;