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