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