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(NO_GCC_PRAGMA)
  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 #if WXWIN_COMPATIBILITY_2_2
  22 #  include "wx/bitmap.h"
  23 #endif
  24 #include "wx/hashmap.h"
  25
  26 #if wxUSE_STREAMS
  27 #  include "wx/stream.h"
  28 #endif
  29
  30 #if wxUSE_IMAGE
  31
  32 // on some systems (Unixware 7.x) index is defined as a macro in the headers
  33 // which breaks the compilation below
  34 #undef index
  35
  36 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
  37
  38 //-----------------------------------------------------------------------------
  39 // classes
  40 //-----------------------------------------------------------------------------
  41
  42 class WXDLLEXPORT wxImageHandler;
  43 class WXDLLEXPORT wxImage;
  44 class WXDLLEXPORT wxPalette;
  45
  46 //-----------------------------------------------------------------------------
  47 // wxImageHandler
  48 //-----------------------------------------------------------------------------
  49
  50 class WXDLLEXPORT wxImageHandler: public wxObject
  51 {
  52 public:
  53     wxImageHandler()
  54         : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(0)
  55         { }
  56
  57 #if wxUSE_STREAMS
  58     virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE, int index=-1 );
  59     virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
  60
  61     virtual int GetImageCount( wxInputStream& stream );
  62
  63     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
  64     bool CanRead( const wxString& name );
  65 #endif // wxUSE_STREAMS
  66
  67     void SetName(const wxString& name) { m_name = name; }
  68     void SetExtension(const wxString& ext) { m_extension = ext; }
  69     void SetType(long type) { m_type = type; }
  70     void SetMimeType(const wxString& type) { m_mime = type; }
  71     wxString GetName() const { return m_name; }
  72     wxString GetExtension() const { return m_extension; }
  73     long GetType() const { return m_type; }
  74     wxString GetMimeType() const { return m_mime; }
  75
  76 protected:
  77 #if wxUSE_STREAMS
  78     virtual bool DoCanRead( wxInputStream& stream ) = 0;
  79
  80     // save the stream position, call DoCanRead() and restore the position
  81     bool CallDoCanRead(wxInputStream& stream);
  82 #endif // wxUSE_STREAMS
  83
  84     wxString  m_name;
  85     wxString  m_extension;
  86     wxString  m_mime;
  87     long      m_type;
  88
  89 private:
  90     DECLARE_CLASS(wxImageHandler)
  91 };
  92
  93 //-----------------------------------------------------------------------------
  94 // wxImageHistogram
  95 //-----------------------------------------------------------------------------
  96
  97 class WXDLLEXPORT wxImageHistogramEntry
  98 {
  99 public:
 100     wxImageHistogramEntry() { index = value = 0; }
 101     unsigned long index;
 102     unsigned long value;
 103 };
 104
 105 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
 106                              wxIntegerHash, wxIntegerEqual,
 107                              wxImageHistogramBase);
 108
 109 class WXDLLEXPORT wxImageHistogram : public wxImageHistogramBase
 110 {
 111 public:
 112     wxImageHistogram() : wxImageHistogramBase(256) { }
 113
 114     // get the key in the histogram for the given RGB values
 115     static unsigned long MakeKey(unsigned char r,
 116                                  unsigned char g,
 117                                  unsigned char b)
 118     {
 119         return (r << 16) | (g << 8) | b;
 120     }
 121
 122     // find first colour that is not used in the image and has higher
 123     // RGB values than RGB(startR, startG, startB)
 124     //
 125     // returns true and puts this colour in r, g, b (each of which may be NULL)
 126     // on success or returns false if there are no more free colours
 127     bool FindFirstUnusedColour(unsigned char *r,
 128                                unsigned char *g,
 129                                unsigned char *b,
 130                                unsigned char startR = 1,
 131                                unsigned char startG = 0,
 132                                unsigned char startB = 0 ) const;
 133 };
 134
 135 //-----------------------------------------------------------------------------
 136 // wxImage
 137 //-----------------------------------------------------------------------------
 138
 139 class WXDLLEXPORT wxImage: public wxObject
 140 {
 141 public:
 142     wxImage();
 143     wxImage( int width, int height, bool clear = true );
 144     wxImage( int width, int height, unsigned char* data, bool static_data = FALSE );
 145     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 146     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
 147
 148 #if wxUSE_STREAMS
 149     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 150     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 151 #endif // wxUSE_STREAMS
 152
 153     wxImage( const wxImage& image );
 154     wxImage( const wxImage* image );
 155
 156     bool Create( int width, int height, bool clear = true );
 157     bool Create( int width, int height, unsigned char* data, bool static_data = FALSE );
 158     void Destroy();
 159
 160     // creates an identical copy of the image (the = operator
 161     // just raises the ref count)
 162     wxImage Copy() const;
 163
 164     // return the new image with size width*height
 165     wxImage GetSubImage( const wxRect& ) const;
 166
 167     // pastes image into this instance and takes care of
 168     // the mask colour and out of bounds problems
 169     void Paste( const wxImage &image, int x, int y );
 170
 171     // return the new image with size width*height
 172     wxImage Scale( int width, int height ) const;
 173
 174     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 175
 176     // rescales the image in place
 177     wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }
 178
 179     // Rotates the image about the given point, 'angle' radians.
 180     // Returns the rotated image, leaving this image intact.
 181     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 182                    bool interpolating = TRUE, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;
 183
 184     wxImage Rotate90( bool clockwise = TRUE ) const;
 185     wxImage Mirror( bool horizontally = TRUE ) const;
 186
 187     // replace one colour with another
 188     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 189                   unsigned char r2, unsigned char g2, unsigned char b2 );
 190
 191     // convert to monochrome image (<r,g,b> will be replaced by white, everything else by black)
 192     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 193
 194     // these routines are slow but safe
 195     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 196     unsigned char GetRed( int x, int y ) const;
 197     unsigned char GetGreen( int x, int y ) const;
 198     unsigned char GetBlue( int x, int y ) const;
 199
 200     void SetAlpha(int x, int y, unsigned char alpha);
 201     unsigned char GetAlpha(int x, int y);
 202
 203     // find first colour that is not used in the image and has higher
 204     // RGB values than <startR,startG,startB>
 205     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 206                                 unsigned char startR = 1, unsigned char startG = 0,
 207                                 unsigned char startB = 0 ) const;
 208     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 209     bool SetMaskFromImage(const wxImage & mask,
 210                           unsigned char mr, unsigned char mg, unsigned char mb);
 211
 212     static bool CanRead( const wxString& name );
 213     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 214     virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 215     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 216
 217 #if wxUSE_STREAMS
 218     static bool CanRead( wxInputStream& stream );
 219     static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
 220     virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 221     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 222 #endif
 223
 224     virtual bool SaveFile( const wxString& name ) const;
 225     virtual bool SaveFile( const wxString& name, int type ) const;
 226     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 227
 228 #if wxUSE_STREAMS
 229     virtual bool SaveFile( wxOutputStream& stream, int type ) const;
 230     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 231 #endif
 232
 233     bool Ok() const;
 234     int GetWidth() const;
 235     int GetHeight() const;
 236
 237     // these functions provide fastest access to wxImage data but should be
 238     // used carefully as no checks are done
 239     unsigned char *GetData() const;
 240     void SetData( unsigned char *data );
 241     void SetData( unsigned char *data, int new_width, int new_height );
 242
 243     unsigned char *GetAlpha() const;    // may return NULL!
 244     bool HasAlpha() const { return GetAlpha() != NULL; }
 245     void SetAlpha(unsigned char *alpha = NULL);
 246
 247     // Mask functions
 248     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 249     unsigned char GetMaskRed() const;
 250     unsigned char GetMaskGreen() const;
 251     unsigned char GetMaskBlue() const;
 252     void SetMask( bool mask = TRUE );
 253     bool HasMask() const;
 254
 255 #if wxUSE_PALETTE
 256     // Palette functions
 257     bool HasPalette() const;
 258     const wxPalette& GetPalette() const;
 259     void SetPalette(const wxPalette& palette);
 260 #endif // wxUSE_PALETTE
 261
 262     // Option functions (arbitrary name/value mapping)
 263     void SetOption(const wxString& name, const wxString& value);
 264     void SetOption(const wxString& name, int value);
 265     wxString GetOption(const wxString& name) const;
 266     int GetOptionInt(const wxString& name) const;
 267     bool HasOption(const wxString& name) const;
 268
 269     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 270
 271     // Computes the histogram of the image and fills a hash table, indexed
 272     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 273     // objects. Each of them contains an 'index' (useful to build a palette
 274     // with the image colours) and a 'value', which is the number of pixels
 275     // in the image with that colour.
 276     // Returned value: # of entries in the histogram
 277     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 278
 279     wxImage& operator = (const wxImage& image)
 280     {
 281         if ( (*this) != image )
 282             Ref(image);
 283         return *this;
 284     }
 285
 286     bool operator == (const wxImage& image) const
 287         { return m_refData == image.m_refData; }
 288     bool operator != (const wxImage& image) const
 289         { return m_refData != image.m_refData; }
 290
 291     static wxList& GetHandlers() { return sm_handlers; }
 292     static void AddHandler( wxImageHandler *handler );
 293     static void InsertHandler( wxImageHandler *handler );
 294     static bool RemoveHandler( const wxString& name );
 295     static wxImageHandler *FindHandler( const wxString& name );
 296     static wxImageHandler *FindHandler( const wxString& extension, long imageType );
 297     static wxImageHandler *FindHandler( long imageType );
 298     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 299
 300     static wxString GetImageExtWildcard();
 301
 302     static void CleanUpHandlers();
 303     static void InitStandardHandlers();
 304
 305 protected:
 306     static wxList   sm_handlers;
 307
 308 private:
 309     friend class WXDLLEXPORT wxImageHandler;
 310
 311     DECLARE_DYNAMIC_CLASS(wxImage)
 312 };
 313
 314
 315 extern void WXDLLEXPORT wxInitAllImageHandlers();
 316
 317 WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
 318
 319 //-----------------------------------------------------------------------------
 320 // wxImage handlers
 321 //-----------------------------------------------------------------------------
 322
 323 #include "wx/imagbmp.h"
 324 #include "wx/imagpng.h"
 325 #include "wx/imaggif.h"
 326 #include "wx/imagpcx.h"
 327 #include "wx/imagjpeg.h"
 328 #include "wx/imagtiff.h"
 329 #include "wx/imagpnm.h"
 330 #include "wx/imagxpm.h"
 331 #include "wx/imagiff.h"
 332
 333 #endif // wxUSE_IMAGE
 334
 335 #endif
 336   // _WX_IMAGE_H_
 337