include/wx/image.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/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 #include "wx/defs.h"
  14
  15 #if wxUSE_IMAGE
  16
  17 #include "wx/object.h"
  18 #include "wx/string.h"
  19 #include "wx/gdicmn.h"
  20 #include "wx/hashmap.h"
  21 #include "wx/arrstr.h"
  22
  23 #if wxUSE_STREAMS
  24 #  include "wx/stream.h"
  25 #endif
  26
  27 // on some systems (Unixware 7.x) index is defined as a macro in the headers
  28 // which breaks the compilation below
  29 #undef index
  30
  31 #define wxIMAGE_OPTION_QUALITY  wxString(wxT("quality"))
  32 #define wxIMAGE_OPTION_FILENAME wxString(wxT("FileName"))
  33
  34 #define wxIMAGE_OPTION_RESOLUTION            wxString(wxT("Resolution"))
  35 #define wxIMAGE_OPTION_RESOLUTIONX           wxString(wxT("ResolutionX"))
  36 #define wxIMAGE_OPTION_RESOLUTIONY           wxString(wxT("ResolutionY"))
  37
  38 #define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(wxT("ResolutionUnit"))
  39
  40 #define wxIMAGE_OPTION_MAX_WIDTH             wxString(wxT("MaxWidth"))
  41 #define wxIMAGE_OPTION_MAX_HEIGHT            wxString(wxT("MaxHeight"))
  42
  43 // constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
  44 //
  45 // NB: don't change these values, they correspond to libjpeg constants
  46 enum wxImageResolution
  47 {
  48     // Resolution not specified
  49     wxIMAGE_RESOLUTION_NONE = 0,
  50
  51     // Resolution specified in inches
  52     wxIMAGE_RESOLUTION_INCHES = 1,
  53
  54     // Resolution specified in centimeters
  55     wxIMAGE_RESOLUTION_CM = 2
  56 };
  57
  58 // Constants for wxImage::Scale() for determining the level of quality
  59 enum
  60 {
  61     wxIMAGE_QUALITY_NORMAL = 0,
  62     wxIMAGE_QUALITY_HIGH = 1
  63 };
  64
  65 // alpha channel values: fully transparent, default threshold separating
  66 // transparent pixels from opaque for a few functions dealing with alpha and
  67 // fully opaque
  68 const unsigned char wxIMAGE_ALPHA_TRANSPARENT = 0;
  69 const unsigned char wxIMAGE_ALPHA_THRESHOLD = 0x80;
  70 const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;
  71
  72 //-----------------------------------------------------------------------------
  73 // classes
  74 //-----------------------------------------------------------------------------
  75
  76 class WXDLLIMPEXP_FWD_CORE wxImageHandler;
  77 class WXDLLIMPEXP_FWD_CORE wxImage;
  78 class WXDLLIMPEXP_FWD_CORE wxPalette;
  79
  80 //-----------------------------------------------------------------------------
  81 // wxVariant support
  82 //-----------------------------------------------------------------------------
  83
  84 #if wxUSE_VARIANT
  85 #include "wx/variant.h"
  86 DECLARE_VARIANT_OBJECT_EXPORTED(wxImage,WXDLLIMPEXP_CORE)
  87 #endif
  88
  89 //-----------------------------------------------------------------------------
  90 // wxImageHandler
  91 //-----------------------------------------------------------------------------
  92
  93 class WXDLLIMPEXP_CORE wxImageHandler: public wxObject
  94 {
  95 public:
  96     wxImageHandler()
  97         : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(wxBITMAP_TYPE_INVALID)
  98         { }
  99
 100 #if wxUSE_STREAMS
 101     // NOTE: LoadFile and SaveFile are not pure virtuals to allow derived classes
 102     //       to implement only one of the two
 103     virtual bool LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream),
 104                            bool WXUNUSED(verbose)=true, int WXUNUSED(index)=-1 )
 105         { return false; }
 106     virtual bool SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream),
 107                            bool WXUNUSED(verbose)=true )
 108         { return false; }
 109
 110     int GetImageCount( wxInputStream& stream );
 111         // save the stream position, call DoGetImageCount() and restore the position
 112
 113     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
 114     bool CanRead( const wxString& name );
 115 #endif // wxUSE_STREAMS
 116
 117     void SetName(const wxString& name) { m_name = name; }
 118     void SetExtension(const wxString& ext) { m_extension = ext; }
 119     void SetAltExtensions(const wxArrayString& exts) { m_altExtensions = exts; }
 120     void SetType(wxBitmapType type) { m_type = type; }
 121     void SetMimeType(const wxString& type) { m_mime = type; }
 122     const wxString& GetName() const { return m_name; }
 123     const wxString& GetExtension() const { return m_extension; }
 124     const wxArrayString& GetAltExtensions() const { return m_altExtensions; }
 125     wxBitmapType GetType() const { return m_type; }
 126     const wxString& GetMimeType() const { return m_mime; }
 127
 128 #if WXWIN_COMPATIBILITY_2_8
 129     wxDEPRECATED(
 130         void SetType(long type) { SetType((wxBitmapType)type); }
 131     )
 132 #endif // WXWIN_COMPATIBILITY_2_8
 133
 134 protected:
 135 #if wxUSE_STREAMS
 136     // NOTE: this function is allowed to change the current stream position
 137     //       since GetImageCount() will take care of restoring it later
 138     virtual int DoGetImageCount( wxInputStream& WXUNUSED(stream) )
 139         { return 1; }       // default return value is 1 image
 140
 141     // NOTE: this function is allowed to change the current stream position
 142     //       since CallDoCanRead() will take care of restoring it later
 143     virtual bool DoCanRead( wxInputStream& stream ) = 0;
 144
 145     // save the stream position, call DoCanRead() and restore the position
 146     bool CallDoCanRead(wxInputStream& stream);
 147 #endif // wxUSE_STREAMS
 148
 149     // helper for the derived classes SaveFile() implementations: returns the
 150     // values of x- and y-resolution options specified as the image options if
 151     // any
 152     static wxImageResolution
 153     GetResolutionFromOptions(const wxImage& image, int *x, int *y);
 154
 155
 156     wxString  m_name;
 157     wxString  m_extension;
 158     wxArrayString m_altExtensions;
 159     wxString  m_mime;
 160     wxBitmapType m_type;
 161
 162 private:
 163     DECLARE_CLASS(wxImageHandler)
 164 };
 165
 166 //-----------------------------------------------------------------------------
 167 // wxImageHistogram
 168 //-----------------------------------------------------------------------------
 169
 170 class WXDLLIMPEXP_CORE wxImageHistogramEntry
 171 {
 172 public:
 173     wxImageHistogramEntry() { index = value = 0; }
 174     unsigned long index;
 175     unsigned long value;
 176 };
 177
 178 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
 179                              wxIntegerHash, wxIntegerEqual,
 180                              wxImageHistogramBase);
 181
 182 class WXDLLIMPEXP_CORE wxImageHistogram : public wxImageHistogramBase
 183 {
 184 public:
 185     wxImageHistogram() : wxImageHistogramBase(256) { }
 186
 187     // get the key in the histogram for the given RGB values
 188     static unsigned long MakeKey(unsigned char r,
 189                                  unsigned char g,
 190                                  unsigned char b)
 191     {
 192         return (r << 16) | (g << 8) | b;
 193     }
 194
 195     // find first colour that is not used in the image and has higher
 196     // RGB values than RGB(startR, startG, startB)
 197     //
 198     // returns true and puts this colour in r, g, b (each of which may be NULL)
 199     // on success or returns false if there are no more free colours
 200     bool FindFirstUnusedColour(unsigned char *r,
 201                                unsigned char *g,
 202                                unsigned char *b,
 203                                unsigned char startR = 1,
 204                                unsigned char startG = 0,
 205                                unsigned char startB = 0 ) const;
 206 };
 207
 208 //-----------------------------------------------------------------------------
 209 // wxImage
 210 //-----------------------------------------------------------------------------
 211
 212 class WXDLLIMPEXP_CORE wxImage: public wxObject
 213 {
 214 public:
 215     // red, green and blue are 8 bit unsigned integers in the range of 0..255
 216     // We use the identifier RGBValue instead of RGB, since RGB is #defined
 217     class RGBValue
 218     {
 219     public:
 220       RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0)
 221         : red(r), green(g), blue(b) {}
 222         unsigned char red;
 223         unsigned char green;
 224         unsigned char blue;
 225     };
 226
 227     // hue, saturation and value are doubles in the range 0.0..1.0
 228     class HSVValue
 229     {
 230     public:
 231         HSVValue(double h=0.0, double s=0.0, double v=0.0)
 232             : hue(h), saturation(s), value(v) {}
 233         double hue;
 234         double saturation;
 235         double value;
 236     };
 237
 238     wxImage() {}
 239     wxImage( int width, int height, bool clear = true )
 240         { Create( width, height, clear ); }
 241     wxImage( int width, int height, unsigned char* data, bool static_data = false )
 242         { Create( width, height, data, static_data ); }
 243     wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false )
 244         { Create( width, height, data, alpha, static_data ); }
 245
 246     // ctor variants using wxSize:
 247     wxImage( const wxSize& sz, bool clear = true )
 248         { Create( sz, clear ); }
 249     wxImage( const wxSize& sz, unsigned char* data, bool static_data = false )
 250         { Create( sz, data, static_data ); }
 251     wxImage( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false )
 252         { Create( sz, data, alpha, static_data ); }
 253
 254     wxImage( const wxString& name, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 )
 255         { LoadFile( name, type, index ); }
 256     wxImage( const wxString& name, const wxString& mimetype, int index = -1 )
 257         { LoadFile( name, mimetype, index ); }
 258     wxImage( const char* const* xpmData )
 259         { Create(xpmData); }
 260
 261 #if wxUSE_STREAMS
 262     wxImage( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 )
 263         { LoadFile( stream, type, index ); }
 264     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 )
 265         { LoadFile( stream, mimetype, index ); }
 266 #endif // wxUSE_STREAMS
 267
 268     bool Create( const char* const* xpmData );
 269 #ifdef __BORLANDC__
 270     // needed for Borland 5.5
 271     wxImage( char** xpmData ) { Create(const_cast<const char* const*>(xpmData)); }
 272     bool Create( char** xpmData ) { return Create(const_cast<const char* const*>(xpmData)); }
 273 #endif
 274
 275     bool Create( int width, int height, bool clear = true );
 276     bool Create( int width, int height, unsigned char* data, bool static_data = false );
 277     bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
 278
 279     // Create() variants using wxSize:
 280     bool Create( const wxSize& sz, bool clear = true )
 281         { return Create(sz.GetWidth(), sz.GetHeight(), clear); }
 282     bool Create( const wxSize& sz, unsigned char* data, bool static_data = false )
 283         { return Create(sz.GetWidth(), sz.GetHeight(), data, static_data); }
 284     bool Create( const wxSize& sz, unsigned char* data, unsigned char* alpha, bool static_data = false )
 285         { return Create(sz.GetWidth(), sz.GetHeight(), data, alpha, static_data); }
 286
 287     void Destroy();
 288
 289     // initialize the image data with zeroes
 290     void Clear(unsigned char value = 0);
 291
 292     // creates an identical copy of the image (the = operator
 293     // just raises the ref count)
 294     wxImage Copy() const;
 295
 296     // return the new image with size width*height
 297     wxImage GetSubImage( const wxRect& rect) const;
 298
 299     // Paste the image or part of this image into an image of the given size at the pos
 300     //  any newly exposed areas will be filled with the rgb colour
 301     //  by default if r = g = b = -1 then fill with this image's mask colour or find and
 302     //  set a suitable mask colour
 303     wxImage Size( const wxSize& size, const wxPoint& pos,
 304                   int r = -1, int g = -1, int b = -1 ) const;
 305
 306     // pastes image into this instance and takes care of
 307     // the mask colour and out of bounds problems
 308     void Paste( const wxImage &image, int x, int y );
 309
 310     // return the new image with size width*height
 311     wxImage Scale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) const;
 312
 313     // box averager and bicubic filters for up/down sampling
 314     wxImage ResampleBox(int width, int height) const;
 315     wxImage ResampleBicubic(int width, int height) const;
 316
 317     // blur the image according to the specified pixel radius
 318     wxImage Blur(int radius) const;
 319     wxImage BlurHorizontal(int radius) const;
 320     wxImage BlurVertical(int radius) const;
 321
 322     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 323
 324     // rescales the image in place
 325     wxImage& Rescale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) { return *this = Scale(width, height, quality); }
 326
 327     // resizes the image in place
 328     wxImage& Resize( const wxSize& size, const wxPoint& pos,
 329                      int r = -1, int g = -1, int b = -1 ) { return *this = Size(size, pos, r, g, b); }
 330
 331     // Rotates the image about the given point, 'angle' radians.
 332     // Returns the rotated image, leaving this image intact.
 333     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 334                    bool interpolating = true, wxPoint * offset_after_rotation = NULL) const;
 335
 336     wxImage Rotate90( bool clockwise = true ) const;
 337     wxImage Mirror( bool horizontally = true ) const;
 338
 339     // replace one colour with another
 340     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 341                   unsigned char r2, unsigned char g2, unsigned char b2 );
 342
 343     // Convert to greyscale image. Uses the luminance component (Y) of the image.
 344     // The luma value (YUV) is calculated using (R * lr) + (G * lg) + (B * lb), defaults to ITU-T BT.601
 345     wxImage ConvertToGreyscale( double lr = 0.299, double lg = 0.587, double lb = 0.114 ) const;
 346
 347     // convert to monochrome image (<r,g,b> will be replaced by white,
 348     // everything else by black)
 349     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 350
 351     // these routines are slow but safe
 352     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 353     void SetRGB( const wxRect& rect, unsigned char r, unsigned char g, unsigned char b );
 354     unsigned char GetRed( int x, int y ) const;
 355     unsigned char GetGreen( int x, int y ) const;
 356     unsigned char GetBlue( int x, int y ) const;
 357
 358     void SetAlpha(int x, int y, unsigned char alpha);
 359     unsigned char GetAlpha(int x, int y) const;
 360
 361     // find first colour that is not used in the image and has higher
 362     // RGB values than <startR,startG,startB>
 363     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 364                                 unsigned char startR = 1, unsigned char startG = 0,
 365                                 unsigned char startB = 0 ) const;
 366     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 367     bool SetMaskFromImage(const wxImage & mask,
 368                           unsigned char mr, unsigned char mg, unsigned char mb);
 369
 370     // converts image's alpha channel to mask (choosing mask colour
 371     // automatically or using the specified colour for the mask), if it has
 372     // any, does nothing otherwise:
 373     bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
 374     void ConvertAlphaToMask(unsigned char mr, unsigned char mg, unsigned char mb,
 375                             unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
 376
 377
 378     // This method converts an image where the original alpha
 379     // information is only available as a shades of a colour
 380     // (actually shades of grey) typically when you draw anti-
 381     // aliased text into a bitmap. The DC drawinf routines
 382     // draw grey values on the black background although they
 383     // actually mean to draw white with differnt alpha values.
 384     // This method reverses it, assuming a black (!) background
 385     // and white text (actually only the red channel is read).
 386     // The method will then fill up the whole image with the
 387     // colour given.
 388     bool ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b );
 389
 390     static bool CanRead( const wxString& name );
 391     static int GetImageCount( const wxString& name, wxBitmapType type = wxBITMAP_TYPE_ANY );
 392     virtual bool LoadFile( const wxString& name, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 );
 393     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 394
 395 #if wxUSE_STREAMS
 396     static bool CanRead( wxInputStream& stream );
 397     static int GetImageCount( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY );
 398     virtual bool LoadFile( wxInputStream& stream, wxBitmapType type = wxBITMAP_TYPE_ANY, int index = -1 );
 399     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 400 #endif
 401
 402     virtual bool SaveFile( const wxString& name ) const;
 403     virtual bool SaveFile( const wxString& name, wxBitmapType type ) const;
 404     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 405
 406 #if wxUSE_STREAMS
 407     virtual bool SaveFile( wxOutputStream& stream, wxBitmapType type ) const;
 408     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 409 #endif
 410
 411     bool Ok() const { return IsOk(); }
 412     bool IsOk() const;
 413     int GetWidth() const;
 414     int GetHeight() const;
 415
 416     wxSize GetSize() const
 417         { return wxSize(GetWidth(), GetHeight()); }
 418
 419     // Gets the type of image found by LoadFile or specified with SaveFile
 420     wxBitmapType GetType() const;
 421
 422     // Set the image type, this is normally only called if the image is being
 423     // created from data in the given format but not using LoadFile() (e.g.
 424     // wxGIFDecoder uses this)
 425     void SetType(wxBitmapType type);
 426
 427     // these functions provide fastest access to wxImage data but should be
 428     // used carefully as no checks are done
 429     unsigned char *GetData() const;
 430     void SetData( unsigned char *data, bool static_data=false );
 431     void SetData( unsigned char *data, int new_width, int new_height, bool static_data=false );
 432
 433     unsigned char *GetAlpha() const;    // may return NULL!
 434     bool HasAlpha() const { return GetAlpha() != NULL; }
 435     void SetAlpha(unsigned char *alpha = NULL, bool static_data=false);
 436     void InitAlpha();
 437
 438     // return true if this pixel is masked or has alpha less than specified
 439     // threshold
 440     bool IsTransparent(int x, int y,
 441                        unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD) const;
 442
 443     // Mask functions
 444     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 445     // Get the current mask colour or find a suitable colour
 446     // returns true if using current mask colour
 447     bool GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const;
 448     unsigned char GetMaskRed() const;
 449     unsigned char GetMaskGreen() const;
 450     unsigned char GetMaskBlue() const;
 451     void SetMask( bool mask = true );
 452     bool HasMask() const;
 453
 454 #if wxUSE_PALETTE
 455     // Palette functions
 456     bool HasPalette() const;
 457     const wxPalette& GetPalette() const;
 458     void SetPalette(const wxPalette& palette);
 459 #endif // wxUSE_PALETTE
 460
 461     // Option functions (arbitrary name/value mapping)
 462     void SetOption(const wxString& name, const wxString& value);
 463     void SetOption(const wxString& name, int value);
 464     wxString GetOption(const wxString& name) const;
 465     int GetOptionInt(const wxString& name) const;
 466     bool HasOption(const wxString& name) const;
 467
 468     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 469
 470     // Computes the histogram of the image and fills a hash table, indexed
 471     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 472     // objects. Each of them contains an 'index' (useful to build a palette
 473     // with the image colours) and a 'value', which is the number of pixels
 474     // in the image with that colour.
 475     // Returned value: # of entries in the histogram
 476     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 477
 478     // Rotates the hue of each pixel of the image. angle is a double in the range
 479     // -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
 480     void RotateHue(double angle);
 481
 482     static wxList& GetHandlers() { return sm_handlers; }
 483     static void AddHandler( wxImageHandler *handler );
 484     static void InsertHandler( wxImageHandler *handler );
 485     static bool RemoveHandler( const wxString& name );
 486     static wxImageHandler *FindHandler( const wxString& name );
 487     static wxImageHandler *FindHandler( const wxString& extension, wxBitmapType imageType );
 488     static wxImageHandler *FindHandler( wxBitmapType imageType );
 489
 490     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 491
 492     static wxString GetImageExtWildcard();
 493
 494     static void CleanUpHandlers();
 495     static void InitStandardHandlers();
 496
 497     static HSVValue RGBtoHSV(const RGBValue& rgb);
 498     static RGBValue HSVtoRGB(const HSVValue& hsv);
 499
 500 #if WXWIN_COMPATIBILITY_2_8
 501     wxDEPRECATED_CONSTRUCTOR(
 502         wxImage(const wxString& name, long type, int index = -1)
 503         {
 504             LoadFile(name, (wxBitmapType)type, index);
 505         }
 506     )
 507
 508 #if wxUSE_STREAMS
 509     wxDEPRECATED_CONSTRUCTOR(
 510         wxImage(wxInputStream& stream, long type, int index = -1)
 511         {
 512             LoadFile(stream, (wxBitmapType)type, index);
 513         }
 514     )
 515
 516     wxDEPRECATED(
 517         bool LoadFile(wxInputStream& stream, long type, int index = -1)
 518         {
 519             return LoadFile(stream, (wxBitmapType)type, index);
 520         }
 521     )
 522
 523     wxDEPRECATED(
 524         bool SaveFile(wxOutputStream& stream, long type) const
 525         {
 526             return SaveFile(stream, (wxBitmapType)type);
 527         }
 528     )
 529 #endif // wxUSE_STREAMS
 530
 531     wxDEPRECATED(
 532         bool LoadFile(const wxString& name, long type, int index = -1)
 533         {
 534             return LoadFile(name, (wxBitmapType)type, index);
 535         }
 536     )
 537
 538     wxDEPRECATED(
 539         bool SaveFile(const wxString& name, long type) const
 540         {
 541             return SaveFile(name, (wxBitmapType)type);
 542         }
 543     )
 544
 545     wxDEPRECATED(
 546         static wxImageHandler *FindHandler(const wxString& ext, long type)
 547         {
 548             return FindHandler(ext, (wxBitmapType)type);
 549         }
 550     )
 551
 552     wxDEPRECATED(
 553         static wxImageHandler *FindHandler(long imageType)
 554         {
 555             return FindHandler((wxBitmapType)imageType);
 556         }
 557     )
 558 #endif // WXWIN_COMPATIBILITY_2_8
 559
 560 protected:
 561     static wxList   sm_handlers;
 562
 563     // return the index of the point with the given coordinates or -1 if the
 564     // image is invalid of the coordinates are out of range
 565     //
 566     // note that index must be multiplied by 3 when using it with RGB array
 567     long XYToIndex(int x, int y) const;
 568
 569     virtual wxObjectRefData* CreateRefData() const;
 570     virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
 571
 572 private:
 573     friend class WXDLLIMPEXP_FWD_CORE wxImageHandler;
 574
 575 #if wxUSE_STREAMS
 576     // read the image from the specified stream updating image type if
 577     // successful
 578     bool DoLoad(wxImageHandler& handler, wxInputStream& stream, int index);
 579
 580     // write the image to the specified stream and also update the image type
 581     // if successful
 582     bool DoSave(wxImageHandler& handler, wxOutputStream& stream) const;
 583 #endif // wxUSE_STREAMS
 584
 585     DECLARE_DYNAMIC_CLASS(wxImage)
 586 };
 587
 588
 589 extern void WXDLLIMPEXP_CORE wxInitAllImageHandlers();
 590
 591 extern WXDLLIMPEXP_DATA_CORE(wxImage)    wxNullImage;
 592
 593 //-----------------------------------------------------------------------------
 594 // wxImage handlers
 595 //-----------------------------------------------------------------------------
 596
 597 #include "wx/imagbmp.h"
 598 #include "wx/imagpng.h"
 599 #include "wx/imaggif.h"
 600 #include "wx/imagpcx.h"
 601 #include "wx/imagjpeg.h"
 602 #include "wx/imagtga.h"
 603 #include "wx/imagtiff.h"
 604 #include "wx/imagpnm.h"
 605 #include "wx/imagxpm.h"
 606 #include "wx/imagiff.h"
 607
 608 #endif // wxUSE_IMAGE
 609
 610 #endif
 611   // _WX_IMAGE_H_