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 #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 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
  33
  34 //-----------------------------------------------------------------------------
  35 // classes
  36 //-----------------------------------------------------------------------------
  37
  38 class WXDLLEXPORT wxImageHandler;
  39 class WXDLLEXPORT wxImage;
  40 class WXDLLEXPORT wxPalette;
  41
  42 //-----------------------------------------------------------------------------
  43 // wxImageHandler
  44 //-----------------------------------------------------------------------------
  45
  46 class WXDLLEXPORT wxImageHandler: public wxObject
  47 {
  48 public:
  49     wxImageHandler()
  50         : m_name(wxT("")), m_extension(wxT("")), m_mime(), m_type(0)
  51         { }
  52
  53 #if wxUSE_STREAMS
  54     virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=TRUE, int index=-1 );
  55     virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=TRUE );
  56
  57     virtual int GetImageCount( wxInputStream& stream );
  58
  59     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
  60     bool CanRead( const wxString& name );
  61 #endif // wxUSE_STREAMS
  62
  63     void SetName(const wxString& name) { m_name = name; }
  64     void SetExtension(const wxString& ext) { m_extension = ext; }
  65     void SetType(long type) { m_type = type; }
  66     void SetMimeType(const wxString& type) { m_mime = type; }
  67     wxString GetName() const { return m_name; }
  68     wxString GetExtension() const { return m_extension; }
  69     long GetType() const { return m_type; }
  70     wxString GetMimeType() const { return m_mime; }
  71
  72 protected:
  73 #if wxUSE_STREAMS
  74     virtual bool DoCanRead( wxInputStream& stream ) = 0;
  75
  76     // save the stream position, call DoCanRead() and restore the position
  77     bool CallDoCanRead(wxInputStream& stream);
  78 #endif // wxUSE_STREAMS
  79
  80     wxString  m_name;
  81     wxString  m_extension;
  82     wxString  m_mime;
  83     long      m_type;
  84
  85 private:
  86     DECLARE_CLASS(wxImageHandler)
  87 };
  88
  89 //-----------------------------------------------------------------------------
  90 // wxImageHistogram
  91 //-----------------------------------------------------------------------------
  92
  93 class WXDLLEXPORT wxImageHistogramEntry
  94 {
  95 public:
  96     wxImageHistogramEntry() : index(0), value(0) {}
  97     unsigned long index;
  98     unsigned long value;
  99 };
 100
 101 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
 102                              wxIntegerHash, wxIntegerEqual,
 103                              wxImageHistogramBase);
 104
 105 class wxImageHistogram : public wxImageHistogramBase
 106 {
 107 public:
 108     wxImageHistogram() : wxImageHistogramBase(256) { }
 109
 110     // get the key in the histogram for the given RGB values
 111     static unsigned long MakeKey(unsigned char r,
 112                                  unsigned char g,
 113                                  unsigned char b)
 114     {
 115         return (r << 16) | (g << 8) | b;
 116     }
 117
 118     // find first colour that is not used in the image and has higher
 119     // RGB values than RGB(startR, startG, startB)
 120     //
 121     // returns true and puts this colour in r, g, b (each of which may be NULL)
 122     // on success or returns false if there are no more free colours
 123     bool FindFirstUnusedColour(unsigned char *r,
 124                                unsigned char *g,
 125                                unsigned char *b,
 126                                unsigned char startR = 1,
 127                                unsigned char startG = 0,
 128                                unsigned char startB = 0 ) const;
 129 };
 130
 131 //-----------------------------------------------------------------------------
 132 // wxImage
 133 //-----------------------------------------------------------------------------
 134
 135 class WXDLLEXPORT wxImage: public wxObject
 136 {
 137 public:
 138     wxImage();
 139     wxImage( int width, int height );
 140     wxImage( int width, int height, unsigned char* data, bool static_data = FALSE );
 141     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 142     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
 143
 144 #if wxUSE_STREAMS
 145     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 146     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 147 #endif // wxUSE_STREAMS
 148
 149     wxImage( const wxImage& image );
 150     wxImage( const wxImage* image );
 151
 152 #if WXWIN_COMPATIBILITY_2_2 && wxUSE_GUI
 153     // conversion to/from wxBitmap (deprecated, use wxBitmap's methods instead):
 154     wxDEPRECATED( wxImage(const wxBitmap &bitmap) );
 155     wxDEPRECATED( wxBitmap ConvertToBitmap() const );
 156 #ifdef __WXGTK__
 157     wxBitmap ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue ) const;
 158 #endif
 159 #endif
 160
 161     void Create( int width, int height );
 162     void Create( int width, int height, unsigned char* data, bool static_data = FALSE );
 163     void Destroy();
 164
 165     // creates an identical copy of the image (the = operator
 166     // just raises the ref count)
 167     wxImage Copy() const;
 168
 169     // return the new image with size width*height
 170     wxImage GetSubImage( const wxRect& ) const;
 171
 172     // pastes image into this instance and takes care of
 173     // the mask colour and out of bounds problems
 174     void Paste( const wxImage &image, int x, int y );
 175
 176     // return the new image with size width*height
 177     wxImage Scale( int width, int height ) const;
 178
 179     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 180
 181     // rescales the image in place
 182     wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }
 183
 184     // Rotates the image about the given point, 'angle' radians.
 185     // Returns the rotated image, leaving this image intact.
 186     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 187                    bool interpolating = TRUE, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;
 188
 189     wxImage Rotate90( bool clockwise = TRUE ) const;
 190     wxImage Mirror( bool horizontally = TRUE ) const;
 191
 192     // replace one colour with another
 193     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 194                   unsigned char r2, unsigned char g2, unsigned char b2 );
 195
 196     // convert to monochrome image (<r,g,b> will be replaced by white, everything else by black)
 197     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 198
 199     // these routines are slow but safe
 200     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 201     unsigned char GetRed( int x, int y ) const;
 202     unsigned char GetGreen( int x, int y ) const;
 203     unsigned char GetBlue( int x, int y ) const;
 204
 205     void SetAlpha(int x, int y, unsigned char alpha);
 206     unsigned char GetAlpha(int x, int y);
 207
 208     // find first colour that is not used in the image and has higher
 209     // RGB values than <startR,startG,startB>
 210     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 211                                 unsigned char startR = 1, unsigned char startG = 0,
 212                                 unsigned char startB = 0 ) const;
 213     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 214     bool SetMaskFromImage(const wxImage & mask,
 215                           unsigned char mr, unsigned char mg, unsigned char mb);
 216
 217     static bool CanRead( const wxString& name );
 218     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 219     virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 220     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 221
 222 #if wxUSE_STREAMS
 223     static bool CanRead( wxInputStream& stream );
 224     static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
 225     virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 226     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 227 #endif
 228
 229     virtual bool SaveFile( const wxString& name ) const;
 230     virtual bool SaveFile( const wxString& name, int type ) const;
 231     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 232
 233 #if wxUSE_STREAMS
 234     virtual bool SaveFile( wxOutputStream& stream, int type ) const;
 235     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 236 #endif
 237
 238     bool Ok() const;
 239     int GetWidth() const;
 240     int GetHeight() const;
 241
 242     // these functions provide fastest access to wxImage data but should be
 243     // used carefully as no checks are done
 244     unsigned char *GetData() const;
 245     void SetData( unsigned char *data );
 246     void SetData( unsigned char *data, int new_width, int new_height );
 247
 248     unsigned char *GetAlpha() const;    // may return NULL!
 249     bool HasAlpha() const { return GetAlpha() != NULL; }
 250     void SetAlpha(unsigned char *alpha = NULL);
 251
 252     // Mask functions
 253     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 254     unsigned char GetMaskRed() const;
 255     unsigned char GetMaskGreen() const;
 256     unsigned char GetMaskBlue() const;
 257     void SetMask( bool mask = TRUE );
 258     bool HasMask() const;
 259
 260 #if wxUSE_PALETTE
 261     // Palette functions
 262     bool HasPalette() const;
 263     const wxPalette& GetPalette() const;
 264     void SetPalette(const wxPalette& palette);
 265 #endif // wxUSE_PALETTE
 266
 267     // Option functions (arbitrary name/value mapping)
 268     void SetOption(const wxString& name, const wxString& value);
 269     void SetOption(const wxString& name, int value);
 270     wxString GetOption(const wxString& name) const;
 271     int GetOptionInt(const wxString& name) const;
 272     bool HasOption(const wxString& name) const;
 273
 274     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 275
 276     // Computes the histogram of the image and fills a hash table, indexed
 277     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 278     // objects. Each of them contains an 'index' (useful to build a palette
 279     // with the image colours) and a 'value', which is the number of pixels
 280     // in the image with that colour.
 281     // Returned value: # of entries in the histogram
 282     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 283
 284     wxImage& operator = (const wxImage& image)
 285     {
 286         if ( (*this) != image )
 287             Ref(image);
 288         return *this;
 289     }
 290
 291     bool operator == (const wxImage& image) const
 292         { return m_refData == image.m_refData; }
 293     bool operator != (const wxImage& image) const
 294         { return m_refData != image.m_refData; }
 295
 296     static wxList& GetHandlers() { return sm_handlers; }
 297     static void AddHandler( wxImageHandler *handler );
 298     static void InsertHandler( wxImageHandler *handler );
 299     static bool RemoveHandler( const wxString& name );
 300     static wxImageHandler *FindHandler( const wxString& name );
 301     static wxImageHandler *FindHandler( const wxString& extension, long imageType );
 302     static wxImageHandler *FindHandler( long imageType );
 303     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 304
 305     static void CleanUpHandlers();
 306     static void InitStandardHandlers();
 307
 308 protected:
 309     static wxList   sm_handlers;
 310
 311 private:
 312     friend class WXDLLEXPORT wxImageHandler;
 313
 314     DECLARE_DYNAMIC_CLASS(wxImage)
 315 };
 316
 317
 318 extern void WXDLLEXPORT wxInitAllImageHandlers();
 319
 320 WXDLLEXPORT_DATA(extern wxImage)    wxNullImage;
 321
 322 //-----------------------------------------------------------------------------
 323 // wxImage handlers
 324 //-----------------------------------------------------------------------------
 325
 326 #include "wx/imagbmp.h"
 327 #include "wx/imagpng.h"
 328 #include "wx/imaggif.h"
 329 #include "wx/imagpcx.h"
 330 #include "wx/imagjpeg.h"
 331 #include "wx/imagtiff.h"
 332 #include "wx/imagpnm.h"
 333 #include "wx/imagxpm.h"
 334 #include "wx/imagiff.h"
 335
 336 #endif // wxUSE_IMAGE
 337
 338 #endif
 339   // _WX_IMAGE_H_
 340