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 #include "wx/hashmap.h"
  22
  23 #if wxUSE_STREAMS
  24 #  include "wx/stream.h"
  25 #endif
  26
  27 #if wxUSE_IMAGE
  28
  29 // on some systems (Unixware 7.x) index is defined as a macro in the headers
  30 // which breaks the compilation below
  31 #undef index
  32
  33 #define wxIMAGE_OPTION_QUALITY  wxString(_T("quality"))
  34 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
  35
  36 #define wxIMAGE_OPTION_RESOLUTION            wxString(_T("Resolution"))
  37 #define wxIMAGE_OPTION_RESOLUTIONX           wxString(_T("ResolutionX"))
  38 #define wxIMAGE_OPTION_RESOLUTIONY           wxString(_T("ResolutionY"))
  39
  40 #define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(_T("ResolutionUnit"))
  41
  42 // constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
  43 enum
  44 {
  45     wxIMAGE_RESOLUTION_INCHES = 1,
  46     wxIMAGE_RESOLUTION_CM = 2
  47 };
  48
  49 //-----------------------------------------------------------------------------
  50 // classes
  51 //-----------------------------------------------------------------------------
  52
  53 class WXDLLEXPORT wxImageHandler;
  54 class WXDLLEXPORT wxImage;
  55 class WXDLLEXPORT wxPalette;
  56
  57 //-----------------------------------------------------------------------------
  58 // wxImageHandler
  59 //-----------------------------------------------------------------------------
  60
  61 class WXDLLEXPORT wxImageHandler: public wxObject
  62 {
  63 public:
  64     wxImageHandler()
  65         : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(0)
  66         { }
  67
  68 #if wxUSE_STREAMS
  69     virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
  70     virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=true );
  71
  72     virtual int GetImageCount( wxInputStream& stream );
  73
  74     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
  75     bool CanRead( const wxString& name );
  76 #endif // wxUSE_STREAMS
  77
  78     void SetName(const wxString& name) { m_name = name; }
  79     void SetExtension(const wxString& ext) { m_extension = ext; }
  80     void SetType(long type) { m_type = type; }
  81     void SetMimeType(const wxString& type) { m_mime = type; }
  82     wxString GetName() const { return m_name; }
  83     wxString GetExtension() const { return m_extension; }
  84     long GetType() const { return m_type; }
  85     wxString GetMimeType() const { return m_mime; }
  86
  87 protected:
  88 #if wxUSE_STREAMS
  89     virtual bool DoCanRead( wxInputStream& stream ) = 0;
  90
  91     // save the stream position, call DoCanRead() and restore the position
  92     bool CallDoCanRead(wxInputStream& stream);
  93 #endif // wxUSE_STREAMS
  94
  95     wxString  m_name;
  96     wxString  m_extension;
  97     wxString  m_mime;
  98     long      m_type;
  99
 100 private:
 101     DECLARE_CLASS(wxImageHandler)
 102 };
 103
 104 //-----------------------------------------------------------------------------
 105 // wxImageHistogram
 106 //-----------------------------------------------------------------------------
 107
 108 class WXDLLEXPORT wxImageHistogramEntry
 109 {
 110 public:
 111     wxImageHistogramEntry() { index = value = 0; }
 112     unsigned long index;
 113     unsigned long value;
 114 };
 115
 116 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
 117                              wxIntegerHash, wxIntegerEqual,
 118                              wxImageHistogramBase);
 119
 120 class WXDLLEXPORT wxImageHistogram : public wxImageHistogramBase
 121 {
 122 public:
 123     wxImageHistogram() : wxImageHistogramBase(256) { }
 124
 125     // get the key in the histogram for the given RGB values
 126     static unsigned long MakeKey(unsigned char r,
 127                                  unsigned char g,
 128                                  unsigned char b)
 129     {
 130         return (r << 16) | (g << 8) | b;
 131     }
 132
 133     // find first colour that is not used in the image and has higher
 134     // RGB values than RGB(startR, startG, startB)
 135     //
 136     // returns true and puts this colour in r, g, b (each of which may be NULL)
 137     // on success or returns false if there are no more free colours
 138     bool FindFirstUnusedColour(unsigned char *r,
 139                                unsigned char *g,
 140                                unsigned char *b,
 141                                unsigned char startR = 1,
 142                                unsigned char startG = 0,
 143                                unsigned char startB = 0 ) const;
 144 };
 145
 146 //-----------------------------------------------------------------------------
 147 // wxImage
 148 //-----------------------------------------------------------------------------
 149
 150 class WXDLLEXPORT wxImage: public wxObject
 151 {
 152 public:
 153     wxImage(){}
 154     wxImage( int width, int height, bool clear = true );
 155     wxImage( int width, int height, unsigned char* data, bool static_data = false );
 156     wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
 157     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 158     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
 159
 160 #if wxUSE_STREAMS
 161     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 162     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 163 #endif // wxUSE_STREAMS
 164
 165     wxImage( const wxImage& image );
 166     wxImage( const wxImage* image );
 167
 168     bool Create( int width, int height, bool clear = true );
 169     bool Create( int width, int height, unsigned char* data, bool static_data = false );
 170     bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
 171     void Destroy();
 172
 173     // creates an identical copy of the image (the = operator
 174     // just raises the ref count)
 175     wxImage Copy() const;
 176
 177     // return the new image with size width*height
 178     wxImage GetSubImage( const wxRect& ) const;
 179
 180     // pastes image into this instance and takes care of
 181     // the mask colour and out of bounds problems
 182     void Paste( const wxImage &image, int x, int y );
 183
 184     // return the new image with size width*height
 185     wxImage Scale( int width, int height ) const;
 186
 187     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 188
 189     // rescales the image in place
 190     wxImage& Rescale( int width, int height ) { return *this = Scale(width, height); }
 191
 192     // Rotates the image about the given point, 'angle' radians.
 193     // Returns the rotated image, leaving this image intact.
 194     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 195                    bool interpolating = true, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;
 196
 197     wxImage Rotate90( bool clockwise = true ) const;
 198     wxImage Mirror( bool horizontally = true ) const;
 199
 200     // replace one colour with another
 201     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 202                   unsigned char r2, unsigned char g2, unsigned char b2 );
 203
 204     // convert to monochrome image (<r,g,b> will be replaced by white,
 205     // everything else by black)
 206     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 207
 208     // these routines are slow but safe
 209     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 210     unsigned char GetRed( int x, int y ) const;
 211     unsigned char GetGreen( int x, int y ) const;
 212     unsigned char GetBlue( int x, int y ) const;
 213
 214     void SetAlpha(int x, int y, unsigned char alpha);
 215     unsigned char GetAlpha(int x, int y) const;
 216
 217     // find first colour that is not used in the image and has higher
 218     // RGB values than <startR,startG,startB>
 219     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 220                                 unsigned char startR = 1, unsigned char startG = 0,
 221                                 unsigned char startB = 0 ) const;
 222     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 223     bool SetMaskFromImage(const wxImage & mask,
 224                           unsigned char mr, unsigned char mg, unsigned char mb);
 225
 226     // converts image's alpha channel to mask, if it has any, does nothing
 227     // otherwise:
 228     bool ConvertAlphaToMask(unsigned char threshold = 128);
 229
 230     // This method converts an image where the original alpha
 231     // information is only available as a shades of a colour
 232     // (actually shades of grey) typically when you draw anti-
 233     // aliased text into a bitmap. The DC drawinf routines
 234     // draw grey values on the black background although they
 235     // actually mean to draw white with differnt alpha values.
 236     // This method reverses it, assuming a black (!) background
 237     // and white text (actually only the red channel is read).
 238     // The method will then fill up the whole image with the
 239     // colour given.
 240     bool ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b );
 241
 242     static bool CanRead( const wxString& name );
 243     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 244     virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 245     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 246
 247 #if wxUSE_STREAMS
 248     static bool CanRead( wxInputStream& stream );
 249     static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
 250     virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 251     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 252 #endif
 253
 254     virtual bool SaveFile( const wxString& name ) const;
 255     virtual bool SaveFile( const wxString& name, int type ) const;
 256     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 257
 258 #if wxUSE_STREAMS
 259     virtual bool SaveFile( wxOutputStream& stream, int type ) const;
 260     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 261 #endif
 262
 263     bool Ok() const;
 264     int GetWidth() const;
 265     int GetHeight() const;
 266
 267     // these functions provide fastest access to wxImage data but should be
 268     // used carefully as no checks are done
 269     unsigned char *GetData() const;
 270     void SetData( unsigned char *data );
 271     void SetData( unsigned char *data, int new_width, int new_height );
 272
 273     unsigned char *GetAlpha() const;    // may return NULL!
 274     bool HasAlpha() const { return GetAlpha() != NULL; }
 275     void SetAlpha(unsigned char *alpha = NULL);
 276     void InitAlpha();
 277
 278     // Mask functions
 279     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 280     unsigned char GetMaskRed() const;
 281     unsigned char GetMaskGreen() const;
 282     unsigned char GetMaskBlue() const;
 283     void SetMask( bool mask = true );
 284     bool HasMask() const;
 285
 286 #if wxUSE_PALETTE
 287     // Palette functions
 288     bool HasPalette() const;
 289     const wxPalette& GetPalette() const;
 290     void SetPalette(const wxPalette& palette);
 291 #endif // wxUSE_PALETTE
 292
 293     // Option functions (arbitrary name/value mapping)
 294     void SetOption(const wxString& name, const wxString& value);
 295     void SetOption(const wxString& name, int value);
 296     wxString GetOption(const wxString& name) const;
 297     int GetOptionInt(const wxString& name) const;
 298     bool HasOption(const wxString& name) const;
 299
 300     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 301
 302     // Computes the histogram of the image and fills a hash table, indexed
 303     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 304     // objects. Each of them contains an 'index' (useful to build a palette
 305     // with the image colours) and a 'value', which is the number of pixels
 306     // in the image with that colour.
 307     // Returned value: # of entries in the histogram
 308     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 309
 310     wxImage& operator = (const wxImage& image)
 311     {
 312         if ( (*this) != image )
 313             Ref(image);
 314         return *this;
 315     }
 316
 317     bool operator == (const wxImage& image) const
 318         { return m_refData == image.m_refData; }
 319     bool operator != (const wxImage& image) const
 320         { return m_refData != image.m_refData; }
 321
 322     static wxList& GetHandlers() { return sm_handlers; }
 323     static void AddHandler( wxImageHandler *handler );
 324     static void InsertHandler( wxImageHandler *handler );
 325     static bool RemoveHandler( const wxString& name );
 326     static wxImageHandler *FindHandler( const wxString& name );
 327     static wxImageHandler *FindHandler( const wxString& extension, long imageType );
 328     static wxImageHandler *FindHandler( long imageType );
 329     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 330
 331     static wxString GetImageExtWildcard();
 332
 333     static void CleanUpHandlers();
 334     static void InitStandardHandlers();
 335
 336 protected:
 337     static wxList   sm_handlers;
 338
 339 private:
 340     friend class WXDLLEXPORT wxImageHandler;
 341
 342     DECLARE_DYNAMIC_CLASS(wxImage)
 343 };
 344
 345
 346 extern void WXDLLEXPORT wxInitAllImageHandlers();
 347
 348 extern WXDLLEXPORT_DATA(wxImage)    wxNullImage;
 349
 350 //-----------------------------------------------------------------------------
 351 // wxImage handlers
 352 //-----------------------------------------------------------------------------
 353
 354 #include "wx/imagbmp.h"
 355 #include "wx/imagpng.h"
 356 #include "wx/imaggif.h"
 357 #include "wx/imagpcx.h"
 358 #include "wx/imagjpeg.h"
 359 #include "wx/imagtiff.h"
 360 #include "wx/imagpnm.h"
 361 #include "wx/imagxpm.h"
 362 #include "wx/imagiff.h"
 363
 364 #endif // wxUSE_IMAGE
 365
 366 #endif
 367   // _WX_IMAGE_H_
 368