include/wx/image.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        image.h
   3 // Purpose:     wxImage class
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 #ifndef _WX_IMAGE_H_
  11 #define _WX_IMAGE_H_
  12
  13 #if defined(__GNUG__) && !defined(__APPLE__)
  14 #pragma interface "image.h"
  15 #endif
  16
  17 #include "wx/setup.h"
  18 #include "wx/object.h"
  19 #include "wx/string.h"
  20 #include "wx/gdicmn.h"
  21 #include "wx/bitmap.h"
  22 #include "wx/hashmap.h"
  23
  24 #if wxUSE_STREAMS
  25 #  include "wx/stream.h"
  26 #endif
  27
  28 #if wxUSE_IMAGE
  29
  30 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
  31
  32 //-----------------------------------------------------------------------------
  33 // classes
  34 //-----------------------------------------------------------------------------
  35
  36 class WXDLLEXPORT wxImageHandler;
  37 class WXDLLEXPORT wxImage;
  38
  39 //-----------------------------------------------------------------------------
  40 // wxImageHandler
  41 //-----------------------------------------------------------------------------
  42
  43 class WXDLLEXPORT wxImageHandler: public wxObject
  44 {
  45 public:
  46     wxImageHandler()
  47         : m_name(""), m_extension(""), m_mime(), m_type(0)
  48         { }
  49
  50 #if wxUSE_STREAMS
  51     virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE, int index=-1 );
  52     virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
  53
  54     virtual int GetImageCount( wxInputStream& stream );
  55
  56     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
  57     bool CanRead( const wxString& name );
  58 #endif // wxUSE_STREAMS
  59
  60     void SetName(const wxString& name) { m_name = name; }
  61     void SetExtension(const wxString& ext) { m_extension = ext; }
  62     void SetType(long type) { m_type = type; }
  63     void SetMimeType(const wxString& type) { m_mime = type; }
  64     wxString GetName() const { return m_name; }
  65     wxString GetExtension() const { return m_extension; }
  66     long GetType() const { return m_type; }
  67     wxString GetMimeType() const { return m_mime; }
  68
  69 protected:
  70 #if wxUSE_STREAMS
  71     virtual bool DoCanRead( wxInputStream& stream ) = 0;
  72
  73     // save the stream position, call DoCanRead() and restore the position
  74     bool CallDoCanRead(wxInputStream& stream);
  75 #endif // wxUSE_STREAMS
  76
  77     wxString  m_name;
  78     wxString  m_extension;
  79     wxString  m_mime;
  80     long      m_type;
  81
  82 private:
  83     DECLARE_CLASS(wxImageHandler)
  84 };
  85
  86 //-----------------------------------------------------------------------------
  87 // wxImageHistogram
  88 //-----------------------------------------------------------------------------
  89
  90 class WXDLLEXPORT wxImageHistogramEntry
  91 {
  92 public:
  93     wxImageHistogramEntry() : index(0), value(0) {}
  94     unsigned long index;
  95     unsigned long value;
  96 };
  97
  98 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
  99                              wxIntegerHash, wxIntegerEqual,
 100                              wxImageHistogram);
 101
 102 //-----------------------------------------------------------------------------
 103 // wxImage
 104 //-----------------------------------------------------------------------------
 105
 106 class WXDLLEXPORT wxImage: public wxObject
 107 {
 108 public:
 109     wxImage();
 110     wxImage( int width, int height );
 111     wxImage( int width, int height, unsigned char* data, bool static_data = FALSE );
 112     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 113     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
 114
 115 #if wxUSE_STREAMS
 116     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 117     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 118 #endif // wxUSE_STREAMS
 119
 120     wxImage( const wxImage& image );
 121     wxImage( const wxImage* image );
 122
 123 #if WXWIN_COMPATIBILITY_2_2 && wxUSE_GUI
 124     // convertion to/from wxBitmap (deprecated, use wxBitmap's methods instead):
 125     wxImage( const wxBitmap &bitmap );
 126     wxBitmap ConvertToBitmap() const;
 127 #ifdef __WXGTK__
 128     wxBitmap ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const;
 129 #endif
 130 #endif
 131
 132     void Create( int width, int height );
 133     void Create( int width, int height, unsigned char* data, bool static_data = FALSE );
 134     void Destroy();
 135
 136     // creates an identical copy of the image (the = operator
 137     // just raises the ref count)
 138     wxImage Copy() const;
 139
 140     // return the new image with size width*height
 141     wxImage GetSubImage( const wxRect& ) const;
 142
 143     // pastes image into this instance and takes care of
 144     // the mask colour and out of bounds problems
 145     void Paste( const wxImage &image, int x, int y );
 146
 147     // return the new image with size width*height
 148     wxImage Scale( int width, int height ) const;
 149
 150     // rescales the image in place
 151     wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }
 152
 153     // Rotates the image about the given point, 'angle' radians.
 154     // Returns the rotated image, leaving this image intact.
 155     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 156                    bool interpolating = TRUE, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;
 157
 158     wxImage Rotate90( bool clockwise = TRUE ) const;
 159     wxImage Mirror( bool horizontally = TRUE ) const;
 160
 161     // replace one colour with another
 162     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 163                   unsigned char r2, unsigned char g2, unsigned char b2 );
 164
 165     // convert to monochrome image (<r,g,b> will be replaced by white, everything else by black)
 166     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 167
 168     // these routines are slow but safe
 169     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 170     unsigned char GetRed( int x, int y ) const;
 171     unsigned char GetGreen( int x, int y ) const;
 172     unsigned char GetBlue( int x, int y ) const;
 173
 174     // find first colour that is not used in the image and has higher
 175     // RGB values than <startR,startG,startB>
 176     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 177                                 unsigned char startR = 1, unsigned char startG = 0,
 178                                 unsigned char startB = 0 ) const;
 179     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 180     bool SetMaskFromImage(const wxImage & mask,
 181                           unsigned char mr, unsigned char mg, unsigned char mb);
 182
 183     static bool CanRead( const wxString& name );
 184     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 185     virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 186     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 187
 188 #if wxUSE_STREAMS
 189     static bool CanRead( wxInputStream& stream );
 190     static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
 191     virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 192     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 193 #endif
 194
 195     virtual bool SaveFile( const wxString& name ) const;
 196     virtual bool SaveFile( const wxString& name, int type ) const;
 197     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 198
 199 #if wxUSE_STREAMS
 200     virtual bool SaveFile( wxOutputStream& stream, int type ) const;
 201     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 202 #endif
 203
 204     bool Ok() const;
 205     int GetWidth() const;
 206     int GetHeight() const;
 207
 208     char unsigned *GetData() const;
 209     void SetData( char unsigned *data );
 210     void SetData( char unsigned *data, int new_width, int new_height );
 211
 212     // Mask functions
 213     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 214     unsigned char GetMaskRed() const;
 215     unsigned char GetMaskGreen() const;
 216     unsigned char GetMaskBlue() const;
 217     void SetMask( bool mask = TRUE );
 218     bool HasMask() const;
 219
 220 #if wxUSE_PALETTE
 221     // Palette functions
 222     bool HasPalette() const;
 223     const wxPalette& GetPalette() const;
 224     void SetPalette(const wxPalette& palette);
 225 #endif // wxUSE_PALETTE
 226
 227     // Option functions (arbitrary name/value mapping)
 228     void SetOption(const wxString& name, const wxString& value);
 229     void SetOption(const wxString& name, int value);
 230     wxString GetOption(const wxString& name) const;
 231     int GetOptionInt(const wxString& name) const;
 232     bool HasOption(const wxString& name) const;
 233
 234     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 235
 236     // Computes the histogram of the image and fills a hash table, indexed
 237     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 238     // objects. Each of them contains an 'index' (useful to build a palette
 239     // with the image colours) and a 'value', which is the number of pixels
 240     // in the image with that colour.
 241     // Returned value: # of entries in the histogram
 242     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 243
 244     wxImage& operator = (const wxImage& image)
 245     {
 246         if ( (*this) != image )
 247             Ref(image);
 248         return *this;
 249     }
 250
 251     bool operator == (const wxImage& image)
 252         { return m_refData == image.m_refData; }
 253     bool operator != (const wxImage& image)
 254         { return m_refData != image.m_refData; }
 255
 256     static wxList& GetHandlers() { return sm_handlers; }
 257     static void AddHandler( wxImageHandler *handler );
 258     static void InsertHandler( wxImageHandler *handler );
 259     static bool RemoveHandler( const wxString& name );
 260     static wxImageHandler *FindHandler( const wxString& name );
 261     static wxImageHandler *FindHandler( const wxString& extension, long imageType );
 262     static wxImageHandler *FindHandler( long imageType );
 263     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 264
 265     static void CleanUpHandlers();
 266     static void InitStandardHandlers();
 267
 268 protected:
 269     static wxList   sm_handlers;
 270
 271 private:
 272     friend class WXDLLEXPORT wxImageHandler;
 273
 274     DECLARE_DYNAMIC_CLASS(wxImage)
 275 };
 276
 277
 278 extern void WXDLLEXPORT wxInitAllImageHandlers();
 279
 280 WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
 281
 282 //-----------------------------------------------------------------------------
 283 // wxImage handlers
 284 //-----------------------------------------------------------------------------
 285
 286 #include "wx/imagbmp.h"
 287 #include "wx/imagpng.h"
 288 #include "wx/imaggif.h"
 289 #include "wx/imagpcx.h"
 290 #include "wx/imagjpeg.h"
 291 #include "wx/imagtiff.h"
 292 #include "wx/imagpnm.h"
 293 #include "wx/imagxpm.h"
 294 #include "wx/imagiff.h"
 295
 296 #endif // wxUSE_IMAGE
 297
 298 #endif
 299   // _WX_IMAGE_H_
 300