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
  22 #if wxUSE_STREAMS
  23 #  include "wx/stream.h"
  24 #endif
  25
  26 // on some systems (Unixware 7.x) index is defined as a macro in the headers
  27 // which breaks the compilation below
  28 #undef index
  29
  30 #define wxIMAGE_OPTION_QUALITY  wxString(_T("quality"))
  31 #define wxIMAGE_OPTION_FILENAME wxString(_T("FileName"))
  32
  33 #define wxIMAGE_OPTION_RESOLUTION            wxString(_T("Resolution"))
  34 #define wxIMAGE_OPTION_RESOLUTIONX           wxString(_T("ResolutionX"))
  35 #define wxIMAGE_OPTION_RESOLUTIONY           wxString(_T("ResolutionY"))
  36
  37 #define wxIMAGE_OPTION_RESOLUTIONUNIT        wxString(_T("ResolutionUnit"))
  38
  39 // constants used with wxIMAGE_OPTION_RESOLUTIONUNIT
  40 enum
  41 {
  42     wxIMAGE_RESOLUTION_INCHES = 1,
  43     wxIMAGE_RESOLUTION_CM = 2
  44 };
  45
  46 // Constants for wxImage::Scale() for determining the level of quality
  47 enum
  48 {
  49     wxIMAGE_QUALITY_NORMAL = 0,
  50     wxIMAGE_QUALITY_HIGH = 1
  51 };
  52
  53 // alpha channel values: fully transparent, default threshold separating
  54 // transparent pixels from opaque for a few functions dealing with alpha and
  55 // fully opaque
  56 const unsigned char wxIMAGE_ALPHA_TRANSPARENT = 0;
  57 const unsigned char wxIMAGE_ALPHA_THRESHOLD = 0x80;
  58 const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;
  59
  60 //-----------------------------------------------------------------------------
  61 // classes
  62 //-----------------------------------------------------------------------------
  63
  64 class WXDLLEXPORT wxImageHandler;
  65 class WXDLLEXPORT wxImage;
  66 class WXDLLEXPORT wxPalette;
  67
  68 //-----------------------------------------------------------------------------
  69 // wxVariant support
  70 //-----------------------------------------------------------------------------
  71
  72 #if wxUSE_VARIANT
  73 #include "wx/variant.h"
  74 DECLARE_VARIANT_OBJECT_EXPORTED(wxImage,WXDLLEXPORT)
  75 #endif
  76
  77 //-----------------------------------------------------------------------------
  78 // wxImageHandler
  79 //-----------------------------------------------------------------------------
  80
  81 class WXDLLEXPORT wxImageHandler: public wxObject
  82 {
  83 public:
  84     wxImageHandler()
  85         : m_name(wxEmptyString), m_extension(wxEmptyString), m_mime(), m_type(0)
  86         { }
  87
  88 #if wxUSE_STREAMS
  89     virtual bool LoadFile( wxImage *image, wxInputStream& stream, bool verbose=true, int index=-1 );
  90     virtual bool SaveFile( wxImage *image, wxOutputStream& stream, bool verbose=true );
  91
  92     virtual int GetImageCount( wxInputStream& stream );
  93
  94     bool CanRead( wxInputStream& stream ) { return CallDoCanRead(stream); }
  95     bool CanRead( const wxString& name );
  96 #endif // wxUSE_STREAMS
  97
  98     void SetName(const wxString& name) { m_name = name; }
  99     void SetExtension(const wxString& ext) { m_extension = ext; }
 100     void SetType(long type) { m_type = type; }
 101     void SetMimeType(const wxString& type) { m_mime = type; }
 102     const wxString& GetName() const { return m_name; }
 103     const wxString& GetExtension() const { return m_extension; }
 104     long GetType() const { return m_type; }
 105     const wxString& GetMimeType() const { return m_mime; }
 106
 107 protected:
 108 #if wxUSE_STREAMS
 109     virtual bool DoCanRead( wxInputStream& stream ) = 0;
 110
 111     // save the stream position, call DoCanRead() and restore the position
 112     bool CallDoCanRead(wxInputStream& stream);
 113 #endif // wxUSE_STREAMS
 114
 115     wxString  m_name;
 116     wxString  m_extension;
 117     wxString  m_mime;
 118     long      m_type;
 119
 120 private:
 121     DECLARE_CLASS(wxImageHandler)
 122 };
 123
 124 //-----------------------------------------------------------------------------
 125 // wxImageHistogram
 126 //-----------------------------------------------------------------------------
 127
 128 class WXDLLEXPORT wxImageHistogramEntry
 129 {
 130 public:
 131     wxImageHistogramEntry() { index = value = 0; }
 132     unsigned long index;
 133     unsigned long value;
 134 };
 135
 136 WX_DECLARE_EXPORTED_HASH_MAP(unsigned long, wxImageHistogramEntry,
 137                              wxIntegerHash, wxIntegerEqual,
 138                              wxImageHistogramBase);
 139
 140 class WXDLLEXPORT wxImageHistogram : public wxImageHistogramBase
 141 {
 142 public:
 143     wxImageHistogram() : wxImageHistogramBase(256) { }
 144
 145     // get the key in the histogram for the given RGB values
 146     static unsigned long MakeKey(unsigned char r,
 147                                  unsigned char g,
 148                                  unsigned char b)
 149     {
 150         return (r << 16) | (g << 8) | b;
 151     }
 152
 153     // find first colour that is not used in the image and has higher
 154     // RGB values than RGB(startR, startG, startB)
 155     //
 156     // returns true and puts this colour in r, g, b (each of which may be NULL)
 157     // on success or returns false if there are no more free colours
 158     bool FindFirstUnusedColour(unsigned char *r,
 159                                unsigned char *g,
 160                                unsigned char *b,
 161                                unsigned char startR = 1,
 162                                unsigned char startG = 0,
 163                                unsigned char startB = 0 ) const;
 164 };
 165
 166 //-----------------------------------------------------------------------------
 167 // wxImage
 168 //-----------------------------------------------------------------------------
 169
 170 class WXDLLEXPORT wxImage: public wxObject
 171 {
 172 public:
 173     // red, green and blue are 8 bit unsigned integers in the range of 0..255
 174     // We use the identifier RGBValue instead of RGB, since RGB is #defined
 175     class RGBValue
 176     {
 177     public:
 178       RGBValue(unsigned char r=0, unsigned char g=0, unsigned char b=0)
 179         : red(r), green(g), blue(b) {}
 180         unsigned char red;
 181         unsigned char green;
 182         unsigned char blue;
 183     };
 184
 185     // hue, saturation and value are doubles in the range 0.0..1.0
 186     class HSVValue
 187     {
 188     public:
 189         HSVValue(double h=0.0, double s=0.0, double v=0.0)
 190             : hue(h), saturation(s), value(v) {}
 191         double hue;
 192         double saturation;
 193         double value;
 194     };
 195
 196     wxImage(){}
 197     wxImage( int width, int height, bool clear = true );
 198     wxImage( int width, int height, unsigned char* data, bool static_data = false );
 199     wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
 200     wxImage( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 201     wxImage( const wxString& name, const wxString& mimetype, int index = -1 );
 202     wxImage( const char* const* xpmData );
 203
 204 #if wxUSE_STREAMS
 205     wxImage( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 206     wxImage( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 207 #endif // wxUSE_STREAMS
 208
 209     bool Create( int width, int height, bool clear = true );
 210     bool Create( int width, int height, unsigned char* data, bool static_data = false );
 211     bool Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data = false );
 212     bool Create( const char* const* xpmData );
 213     void Destroy();
 214
 215     // creates an identical copy of the image (the = operator
 216     // just raises the ref count)
 217     wxImage Copy() const;
 218
 219     // return the new image with size width*height
 220     wxImage GetSubImage( const wxRect& rect) const;
 221
 222     // Paste the image or part of this image into an image of the given size at the pos
 223     //  any newly exposed areas will be filled with the rgb colour
 224     //  by default if r = g = b = -1 then fill with this image's mask colour or find and
 225     //  set a suitable mask colour
 226     wxImage Size( const wxSize& size, const wxPoint& pos,
 227                   int r = -1, int g = -1, int b = -1 ) const;
 228
 229     // pastes image into this instance and takes care of
 230     // the mask colour and out of bounds problems
 231     void Paste( const wxImage &image, int x, int y );
 232
 233     // return the new image with size width*height
 234     wxImage Scale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) const;
 235
 236     // box averager and bicubic filters for up/down sampling
 237     wxImage ResampleBox(int width, int height) const;
 238     wxImage ResampleBicubic(int width, int height) const;
 239
 240     // blur the image according to the specified pixel radius
 241     wxImage Blur(int radius);
 242     wxImage BlurHorizontal(int radius);
 243     wxImage BlurVertical(int radius);
 244
 245     wxImage ShrinkBy( int xFactor , int yFactor ) const ;
 246
 247     // rescales the image in place
 248     wxImage& Rescale( int width, int height, int quality = wxIMAGE_QUALITY_NORMAL ) { return *this = Scale(width, height, quality); }
 249
 250     // resizes the image in place
 251     wxImage& Resize( const wxSize& size, const wxPoint& pos,
 252                      int r = -1, int g = -1, int b = -1 ) { return *this = Size(size, pos, r, g, b); }
 253
 254     // Rotates the image about the given point, 'angle' radians.
 255     // Returns the rotated image, leaving this image intact.
 256     wxImage Rotate(double angle, const wxPoint & centre_of_rotation,
 257                    bool interpolating = true, wxPoint * offset_after_rotation = (wxPoint*) NULL) const;
 258
 259     wxImage Rotate90( bool clockwise = true ) const;
 260     wxImage Mirror( bool horizontally = true ) const;
 261
 262     // replace one colour with another
 263     void Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 264                   unsigned char r2, unsigned char g2, unsigned char b2 );
 265
 266     // Convert to greyscale image. Uses the luminance component (Y) of the image.
 267     // The luma value (YUV) is calculated using (R * lr) + (G * lg) + (B * lb), defaults to ITU-T BT.601
 268     wxImage ConvertToGreyscale( double lr = 0.299, double lg = 0.587, double lb = 0.114 ) const;
 269
 270     // convert to monochrome image (<r,g,b> will be replaced by white,
 271     // everything else by black)
 272     wxImage ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const;
 273
 274     // these routines are slow but safe
 275     void SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b );
 276     void SetRGB( const wxRect& rect, unsigned char r, unsigned char g, unsigned char b );
 277     unsigned char GetRed( int x, int y ) const;
 278     unsigned char GetGreen( int x, int y ) const;
 279     unsigned char GetBlue( int x, int y ) const;
 280
 281     void SetAlpha(int x, int y, unsigned char alpha);
 282     unsigned char GetAlpha(int x, int y) const;
 283
 284     // find first colour that is not used in the image and has higher
 285     // RGB values than <startR,startG,startB>
 286     bool FindFirstUnusedColour( unsigned char *r, unsigned char *g, unsigned char *b,
 287                                 unsigned char startR = 1, unsigned char startG = 0,
 288                                 unsigned char startB = 0 ) const;
 289     // Set image's mask to the area of 'mask' that has <r,g,b> colour
 290     bool SetMaskFromImage(const wxImage & mask,
 291                           unsigned char mr, unsigned char mg, unsigned char mb);
 292
 293     // converts image's alpha channel to mask, if it has any, does nothing
 294     // otherwise:
 295     bool ConvertAlphaToMask(unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD);
 296
 297     // This method converts an image where the original alpha
 298     // information is only available as a shades of a colour
 299     // (actually shades of grey) typically when you draw anti-
 300     // aliased text into a bitmap. The DC drawinf routines
 301     // draw grey values on the black background although they
 302     // actually mean to draw white with differnt alpha values.
 303     // This method reverses it, assuming a black (!) background
 304     // and white text (actually only the red channel is read).
 305     // The method will then fill up the whole image with the
 306     // colour given.
 307     bool ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b );
 308
 309     static bool CanRead( const wxString& name );
 310     static int GetImageCount( const wxString& name, long type = wxBITMAP_TYPE_ANY );
 311     virtual bool LoadFile( const wxString& name, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 312     virtual bool LoadFile( const wxString& name, const wxString& mimetype, int index = -1 );
 313
 314 #if wxUSE_STREAMS
 315     static bool CanRead( wxInputStream& stream );
 316     static int GetImageCount( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY );
 317     virtual bool LoadFile( wxInputStream& stream, long type = wxBITMAP_TYPE_ANY, int index = -1 );
 318     virtual bool LoadFile( wxInputStream& stream, const wxString& mimetype, int index = -1 );
 319 #endif
 320
 321     virtual bool SaveFile( const wxString& name ) const;
 322     virtual bool SaveFile( const wxString& name, int type ) const;
 323     virtual bool SaveFile( const wxString& name, const wxString& mimetype ) const;
 324
 325 #if wxUSE_STREAMS
 326     virtual bool SaveFile( wxOutputStream& stream, int type ) const;
 327     virtual bool SaveFile( wxOutputStream& stream, const wxString& mimetype ) const;
 328 #endif
 329
 330     bool Ok() const;
 331     int GetWidth() const;
 332     int GetHeight() const;
 333
 334     // these functions provide fastest access to wxImage data but should be
 335     // used carefully as no checks are done
 336     unsigned char *GetData() const;
 337     void SetData( unsigned char *data, bool static_data=false );
 338     void SetData( unsigned char *data, int new_width, int new_height, bool static_data=false );
 339
 340     unsigned char *GetAlpha() const;    // may return NULL!
 341     bool HasAlpha() const { return GetAlpha() != NULL; }
 342     void SetAlpha(unsigned char *alpha = NULL, bool static_data=false);
 343     void InitAlpha();
 344
 345     // return true if this pixel is masked or has alpha less than specified
 346     // threshold
 347     bool IsTransparent(int x, int y,
 348                        unsigned char threshold = wxIMAGE_ALPHA_THRESHOLD) const;
 349
 350     // Mask functions
 351     void SetMaskColour( unsigned char r, unsigned char g, unsigned char b );
 352     // Get the current mask colour or find a suitable colour
 353     // returns true if using current mask colour
 354     bool GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const;
 355     unsigned char GetMaskRed() const;
 356     unsigned char GetMaskGreen() const;
 357     unsigned char GetMaskBlue() const;
 358     void SetMask( bool mask = true );
 359     bool HasMask() const;
 360
 361 #if wxUSE_PALETTE
 362     // Palette functions
 363     bool HasPalette() const;
 364     const wxPalette& GetPalette() const;
 365     void SetPalette(const wxPalette& palette);
 366 #endif // wxUSE_PALETTE
 367
 368     // Option functions (arbitrary name/value mapping)
 369     void SetOption(const wxString& name, const wxString& value);
 370     void SetOption(const wxString& name, int value);
 371     wxString GetOption(const wxString& name) const;
 372     int GetOptionInt(const wxString& name) const;
 373     bool HasOption(const wxString& name) const;
 374
 375     unsigned long CountColours( unsigned long stopafter = (unsigned long) -1 ) const;
 376
 377     // Computes the histogram of the image and fills a hash table, indexed
 378     // with integer keys built as 0xRRGGBB, containing wxImageHistogramEntry
 379     // objects. Each of them contains an 'index' (useful to build a palette
 380     // with the image colours) and a 'value', which is the number of pixels
 381     // in the image with that colour.
 382     // Returned value: # of entries in the histogram
 383     unsigned long ComputeHistogram( wxImageHistogram &h ) const;
 384
 385     // Rotates the hue of each pixel of the image. angle is a double in the range
 386     // -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
 387     void RotateHue(double angle);
 388
 389     bool operator == (const wxImage& image) const
 390         { return m_refData == image.m_refData; }
 391     bool operator != (const wxImage& image) const
 392         { return m_refData != image.m_refData; }
 393
 394     static wxList& GetHandlers() { return sm_handlers; }
 395     static void AddHandler( wxImageHandler *handler );
 396     static void InsertHandler( wxImageHandler *handler );
 397     static bool RemoveHandler( const wxString& name );
 398     static wxImageHandler *FindHandler( const wxString& name );
 399     static wxImageHandler *FindHandler( const wxString& extension, long imageType );
 400     static wxImageHandler *FindHandler( long imageType );
 401     static wxImageHandler *FindHandlerMime( const wxString& mimetype );
 402
 403     static wxString GetImageExtWildcard();
 404
 405     static void CleanUpHandlers();
 406     static void InitStandardHandlers();
 407
 408     static HSVValue RGBtoHSV(const RGBValue& rgb);
 409     static RGBValue HSVtoRGB(const HSVValue& hsv);
 410
 411
 412 protected:
 413     static wxList   sm_handlers;
 414
 415     // return the index of the point with the given coordinates or -1 if the
 416     // image is invalid of the coordinates are out of range
 417     //
 418     // note that index must be multiplied by 3 when using it with RGB array
 419     long XYToIndex(int x, int y) const;
 420
 421     virtual wxObjectRefData* CreateRefData() const;
 422     virtual wxObjectRefData* CloneRefData(const wxObjectRefData* data) const;
 423
 424 private:
 425     friend class WXDLLEXPORT wxImageHandler;
 426
 427     DECLARE_DYNAMIC_CLASS(wxImage)
 428 };
 429
 430
 431 extern void WXDLLEXPORT wxInitAllImageHandlers();
 432
 433 extern WXDLLEXPORT_DATA(wxImage)    wxNullImage;
 434
 435 //-----------------------------------------------------------------------------
 436 // wxImage handlers
 437 //-----------------------------------------------------------------------------
 438
 439 #include "wx/imagbmp.h"
 440 #include "wx/imagpng.h"
 441 #include "wx/imaggif.h"
 442 #include "wx/imagpcx.h"
 443 #include "wx/imagjpeg.h"
 444 #include "wx/imagtiff.h"
 445 #include "wx/imagpnm.h"
 446 #include "wx/imagxpm.h"
 447 #include "wx/imagiff.h"
 448
 449 #endif // wxUSE_IMAGE
 450
 451 #endif
 452   // _WX_IMAGE_H_