src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_IMAGE
  18
  19 #include "wx/image.h"
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/log.h"
  23     #include "wx/hash.h"
  24     #include "wx/utils.h"
  25     #include "wx/math.h"
  26     #include "wx/module.h"
  27     #include "wx/palette.h"
  28     #include "wx/intl.h"
  29 #endif
  30
  31 #include "wx/filefn.h"
  32 #include "wx/wfstream.h"
  33 #include "wx/xpmdecod.h"
  34
  35 // For memcpy
  36 #include <string.h>
  37
  38 // make the code compile with either wxFile*Stream or wxFFile*Stream:
  39 #define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE))
  40
  41 #if HAS_FILE_STREAMS
  42     #if wxUSE_FILE
  43         typedef wxFileInputStream wxImageFileInputStream;
  44         typedef wxFileOutputStream wxImageFileOutputStream;
  45     #elif wxUSE_FFILE
  46         typedef wxFFileInputStream wxImageFileInputStream;
  47         typedef wxFFileOutputStream wxImageFileOutputStream;
  48     #endif // wxUSE_FILE/wxUSE_FFILE
  49 #endif // HAS_FILE_STREAMS
  50
  51 #if wxUSE_VARIANT
  52 IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT)
  53 #endif
  54
  55 //-----------------------------------------------------------------------------
  56 // wxImage
  57 //-----------------------------------------------------------------------------
  58
  59 class wxImageRefData: public wxObjectRefData
  60 {
  61 public:
  62     wxImageRefData();
  63     virtual ~wxImageRefData();
  64
  65     int             m_width;
  66     int             m_height;
  67     unsigned char  *m_data;
  68
  69     bool            m_hasMask;
  70     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  71
  72     // alpha channel data, may be NULL for the formats without alpha support
  73     unsigned char  *m_alpha;
  74
  75     bool            m_ok;
  76
  77     // if true, m_data is pointer to static data and shouldn't be freed
  78     bool            m_static;
  79
  80     // same as m_static but for m_alpha
  81     bool            m_staticAlpha;
  82
  83 #if wxUSE_PALETTE
  84     wxPalette       m_palette;
  85 #endif // wxUSE_PALETTE
  86
  87     wxArrayString   m_optionNames;
  88     wxArrayString   m_optionValues;
  89
  90     DECLARE_NO_COPY_CLASS(wxImageRefData)
  91 };
  92
  93 wxImageRefData::wxImageRefData()
  94 {
  95     m_width = 0;
  96     m_height = 0;
  97     m_data =
  98     m_alpha = (unsigned char *) NULL;
  99
 100     m_maskRed = 0;
 101     m_maskGreen = 0;
 102     m_maskBlue = 0;
 103     m_hasMask = false;
 104
 105     m_ok = false;
 106     m_static =
 107     m_staticAlpha = false;
 108 }
 109
 110 wxImageRefData::~wxImageRefData()
 111 {
 112     if ( !m_static )
 113         free( m_data );
 114     if ( !m_staticAlpha )
 115         free( m_alpha );
 116 }
 117
 118 wxList wxImage::sm_handlers;
 119
 120 wxImage wxNullImage;
 121
 122 //-----------------------------------------------------------------------------
 123
 124 #define M_IMGDATA wx_static_cast(wxImageRefData*, m_refData)
 125
 126 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 127
 128 wxImage::wxImage( int width, int height, bool clear )
 129 {
 130     Create( width, height, clear );
 131 }
 132
 133 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 134 {
 135     Create( width, height, data, static_data );
 136 }
 137
 138 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 139 {
 140     Create( width, height, data, alpha, static_data );
 141 }
 142
 143 wxImage::wxImage( const wxString& name, long type, int index )
 144 {
 145     LoadFile( name, type, index );
 146 }
 147
 148 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 149 {
 150     LoadFile( name, mimetype, index );
 151 }
 152
 153 #if wxUSE_STREAMS
 154 wxImage::wxImage( wxInputStream& stream, long type, int index )
 155 {
 156     LoadFile( stream, type, index );
 157 }
 158
 159 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 160 {
 161     LoadFile( stream, mimetype, index );
 162 }
 163 #endif // wxUSE_STREAMS
 164
 165 wxImage::wxImage(const char* const* xpmData)
 166 {
 167     Create(xpmData);
 168 }
 169
 170 bool wxImage::Create(const char* const* xpmData)
 171 {
 172 #if wxUSE_XPM
 173     UnRef();
 174
 175     wxXPMDecoder decoder;
 176     (*this) = decoder.ReadData(xpmData);
 177     return Ok();
 178 #else
 179     return false;
 180 #endif
 181 }
 182
 183 bool wxImage::Create( int width, int height, bool clear )
 184 {
 185     UnRef();
 186
 187     m_refData = new wxImageRefData();
 188
 189     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 190     if (!M_IMGDATA->m_data)
 191     {
 192         UnRef();
 193         return false;
 194     }
 195
 196     if (clear)
 197         memset(M_IMGDATA->m_data, 0, width*height*3);
 198
 199     M_IMGDATA->m_width = width;
 200     M_IMGDATA->m_height = height;
 201     M_IMGDATA->m_ok = true;
 202
 203     return true;
 204 }
 205
 206 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 207 {
 208     UnRef();
 209
 210     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 211
 212     m_refData = new wxImageRefData();
 213
 214     M_IMGDATA->m_data = data;
 215     M_IMGDATA->m_width = width;
 216     M_IMGDATA->m_height = height;
 217     M_IMGDATA->m_ok = true;
 218     M_IMGDATA->m_static = static_data;
 219
 220     return true;
 221 }
 222
 223 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 224 {
 225     UnRef();
 226
 227     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 228
 229     m_refData = new wxImageRefData();
 230
 231     M_IMGDATA->m_data = data;
 232     M_IMGDATA->m_alpha = alpha;
 233     M_IMGDATA->m_width = width;
 234     M_IMGDATA->m_height = height;
 235     M_IMGDATA->m_ok = true;
 236     M_IMGDATA->m_static = static_data;
 237
 238     return true;
 239 }
 240
 241 void wxImage::Destroy()
 242 {
 243     UnRef();
 244 }
 245
 246 wxObjectRefData* wxImage::CreateRefData() const
 247 {
 248     return new wxImageRefData;
 249 }
 250
 251 wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
 252 {
 253     const wxImageRefData* refData = wx_static_cast(const wxImageRefData*, that);
 254     wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
 255
 256     wxImageRefData* refData_new = new wxImageRefData;
 257     refData_new->m_width = refData->m_width;
 258     refData_new->m_height = refData->m_height;
 259     refData_new->m_maskRed = refData->m_maskRed;
 260     refData_new->m_maskGreen = refData->m_maskGreen;
 261     refData_new->m_maskBlue = refData->m_maskBlue;
 262     refData_new->m_hasMask = refData->m_hasMask;
 263     refData_new->m_ok = true;
 264     unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height);
 265     if (refData->m_alpha != NULL)
 266     {
 267         refData_new->m_alpha = (unsigned char*)malloc(size);
 268         memcpy(refData_new->m_alpha, refData->m_alpha, size);
 269     }
 270     size *= 3;
 271     refData_new->m_data = (unsigned char*)malloc(size);
 272     memcpy(refData_new->m_data, refData->m_data, size);
 273 #if wxUSE_PALETTE
 274     refData_new->m_palette = refData->m_palette;
 275 #endif
 276     refData_new->m_optionNames = refData->m_optionNames;
 277     refData_new->m_optionValues = refData->m_optionValues;
 278     return refData_new;
 279 }
 280
 281 wxImage wxImage::Copy() const
 282 {
 283     wxImage image;
 284
 285     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 286
 287     image.m_refData = CloneRefData(m_refData);
 288
 289     return image;
 290 }
 291
 292 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 293 {
 294     if( xFactor == 1 && yFactor == 1 )
 295         return *this;
 296
 297     wxImage image;
 298
 299     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 300
 301     // can't scale to/from 0 size
 302     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 303                  wxT("invalid new image size") );
 304
 305     long old_height = M_IMGDATA->m_height,
 306          old_width  = M_IMGDATA->m_width;
 307
 308     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 309                  wxT("invalid old image size") );
 310
 311     long width = old_width / xFactor ;
 312     long height = old_height / yFactor ;
 313
 314     image.Create( width, height, false );
 315
 316     char unsigned *data = image.GetData();
 317
 318     wxCHECK_MSG( data, image, wxT("unable to create image") );
 319
 320     bool hasMask = false ;
 321     unsigned char maskRed = 0;
 322     unsigned char maskGreen = 0;
 323     unsigned char maskBlue =0 ;
 324
 325     unsigned char *source_data = M_IMGDATA->m_data;
 326     unsigned char *target_data = data;
 327     unsigned char *source_alpha = 0 ;
 328     unsigned char *target_alpha = 0 ;
 329     if (M_IMGDATA->m_hasMask)
 330     {
 331         hasMask = true ;
 332         maskRed = M_IMGDATA->m_maskRed;
 333         maskGreen = M_IMGDATA->m_maskGreen;
 334         maskBlue =M_IMGDATA->m_maskBlue ;
 335
 336         image.SetMaskColour( M_IMGDATA->m_maskRed,
 337                              M_IMGDATA->m_maskGreen,
 338                              M_IMGDATA->m_maskBlue );
 339     }
 340     else
 341     {
 342         source_alpha = M_IMGDATA->m_alpha ;
 343         if ( source_alpha )
 344         {
 345             image.SetAlpha() ;
 346             target_alpha = image.GetAlpha() ;
 347         }
 348     }
 349
 350     for (long y = 0; y < height; y++)
 351     {
 352         for (long x = 0; x < width; x++)
 353         {
 354             unsigned long avgRed = 0 ;
 355             unsigned long avgGreen = 0;
 356             unsigned long avgBlue = 0;
 357             unsigned long avgAlpha = 0 ;
 358             unsigned long counter = 0 ;
 359             // determine average
 360             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 361             {
 362                 long y_offset = (y * yFactor + y1) * old_width;
 363                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 364                 {
 365                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 366                     unsigned char red = pixel[0] ;
 367                     unsigned char green = pixel[1] ;
 368                     unsigned char blue = pixel[2] ;
 369                     unsigned char alpha = 255  ;
 370                     if ( source_alpha )
 371                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 372                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 373                     {
 374                         if ( alpha > 0 )
 375                         {
 376                             avgRed += red ;
 377                             avgGreen += green ;
 378                             avgBlue += blue ;
 379                         }
 380                         avgAlpha += alpha ;
 381                         counter++ ;
 382                     }
 383                 }
 384             }
 385             if ( counter == 0 )
 386             {
 387                 *(target_data++) = M_IMGDATA->m_maskRed ;
 388                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 389                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 390             }
 391             else
 392             {
 393                 if ( source_alpha )
 394                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 395                 *(target_data++) = (unsigned char)(avgRed / counter);
 396                 *(target_data++) = (unsigned char)(avgGreen / counter);
 397                 *(target_data++) = (unsigned char)(avgBlue / counter);
 398             }
 399         }
 400     }
 401
 402     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 403     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 404         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 405                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 406     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 407         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 408                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 409
 410     return image;
 411 }
 412
 413 wxImage wxImage::Scale( int width, int height, int quality ) const
 414 {
 415     wxImage image;
 416
 417     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 418
 419     // can't scale to/from 0 size
 420     wxCHECK_MSG( (width > 0) && (height > 0), image,
 421                  wxT("invalid new image size") );
 422
 423     long old_height = M_IMGDATA->m_height,
 424          old_width  = M_IMGDATA->m_width;
 425     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 426                  wxT("invalid old image size") );
 427
 428     // If the image's new width and height are the same as the original, no
 429     // need to waste time or CPU cycles
 430     if ( old_width == width && old_height == height )
 431         return *this;
 432
 433     // Scale the image (...or more appropriately, resample the image) using
 434     // either the high-quality or normal method as specified
 435     if ( quality == wxIMAGE_QUALITY_HIGH )
 436     {
 437         // We need to check whether we are downsampling or upsampling the image
 438         if ( width < old_width && height < old_height )
 439         {
 440             // Downsample the image using the box averaging method for best results
 441             image = ResampleBox(width, height);
 442         }
 443         else
 444         {
 445             // For upsampling or other random/wierd image dimensions we'll use
 446             // a bicubic b-spline scaling method
 447             image = ResampleBicubic(width, height);
 448         }
 449     }
 450     else    // Default scaling method == simple pixel replication
 451     {
 452         if ( old_width % width == 0 && old_width >= width &&
 453             old_height % height == 0 && old_height >= height )
 454         {
 455             return ShrinkBy( old_width / width , old_height / height ) ;
 456         }
 457         image.Create( width, height, false );
 458
 459         unsigned char *data = image.GetData();
 460
 461         wxCHECK_MSG( data, image, wxT("unable to create image") );
 462
 463         unsigned char *source_data = M_IMGDATA->m_data;
 464         unsigned char *target_data = data;
 465         unsigned char *source_alpha = 0 ;
 466         unsigned char *target_alpha = 0 ;
 467
 468         if ( !M_IMGDATA->m_hasMask )
 469         {
 470             source_alpha = M_IMGDATA->m_alpha ;
 471             if ( source_alpha )
 472             {
 473                 image.SetAlpha() ;
 474                 target_alpha = image.GetAlpha() ;
 475             }
 476         }
 477
 478         long x_delta = (old_width<<16) / width;
 479         long y_delta = (old_height<<16) / height;
 480
 481         unsigned char* dest_pixel = target_data;
 482
 483         long y = 0;
 484         for ( long j = 0; j < height; j++ )
 485         {
 486             unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 487             unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 488
 489             long x = 0;
 490             for ( long i = 0; i < width; i++ )
 491             {
 492                 unsigned char* src_pixel = &src_line[(x>>16)*3];
 493                 unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 494                 dest_pixel[0] = src_pixel[0];
 495                 dest_pixel[1] = src_pixel[1];
 496                 dest_pixel[2] = src_pixel[2];
 497                 dest_pixel += 3;
 498                 if ( source_alpha )
 499                     *(target_alpha++) = *src_alpha_pixel ;
 500                 x += x_delta;
 501             }
 502
 503             y += y_delta;
 504         }
 505     }
 506
 507     // If the original image has a mask, apply the mask to the new image
 508     if (M_IMGDATA->m_hasMask)
 509     {
 510         image.SetMaskColour( M_IMGDATA->m_maskRed,
 511                             M_IMGDATA->m_maskGreen,
 512                             M_IMGDATA->m_maskBlue );
 513     }
 514
 515     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 516     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 517         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 518                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 519     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 520         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 521                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 522
 523     return image;
 524 }
 525
 526 wxImage wxImage::ResampleBox(int width, int height) const
 527 {
 528     // This function implements a simple pre-blur/box averaging method for
 529     // downsampling that gives reasonably smooth results To scale the image
 530     // down we will need to gather a grid of pixels of the size of the scale
 531     // factor in each direction and then do an averaging of the pixels.
 532
 533     wxImage ret_image(width, height, false);
 534
 535     const double scale_factor_x = double(M_IMGDATA->m_width) / width;
 536     const double scale_factor_y = double(M_IMGDATA->m_height) / height;
 537
 538     const int scale_factor_x_2 = (int)(scale_factor_x / 2);
 539     const int scale_factor_y_2 = (int)(scale_factor_y / 2);
 540
 541     // If we want good-looking results we need to pre-blur the image a bit first
 542     wxImage src_image(*this);
 543     src_image = src_image.BlurHorizontal(scale_factor_x_2);
 544     src_image = src_image.BlurVertical(scale_factor_y_2);
 545
 546     unsigned char* src_data = src_image.GetData();
 547     unsigned char* src_alpha = src_image.GetAlpha();
 548     unsigned char* dst_data = ret_image.GetData();
 549     unsigned char* dst_alpha = NULL;
 550
 551     if ( src_alpha )
 552     {
 553         ret_image.SetAlpha();
 554         dst_alpha = ret_image.GetAlpha();
 555     }
 556
 557     int averaged_pixels, src_pixel_index;
 558     double sum_r, sum_g, sum_b, sum_a;
 559
 560     for ( int y = 0; y < height; y++ )         // Destination image - Y direction
 561     {
 562         // Source pixel in the Y direction
 563         int src_y = (int)(y * scale_factor_y);
 564
 565         for ( int x = 0; x < width; x++ )      // Destination image - X direction
 566         {
 567             // Source pixel in the X direction
 568             int src_x = (int)(x * scale_factor_x);
 569
 570             // Box of pixels to average
 571             averaged_pixels = 0;
 572             sum_r = sum_g = sum_b = sum_a = 0.0;
 573
 574             for ( int j = int(src_y - scale_factor_y/2.0 + 1);
 575                   j <= int(src_y + scale_factor_y_2);
 576                   j++ )
 577             {
 578                 // We don't care to average pixels that don't exist (edges)
 579                 if ( j < 0 || j > M_IMGDATA->m_height )
 580                     continue;
 581
 582                 for ( int i = int(src_x - scale_factor_x/2.0 + 1);
 583                       i <= src_x + scale_factor_x_2;
 584                       i++ )
 585                 {
 586                     // Don't average edge pixels
 587                     if ( i < 0 || i > M_IMGDATA->m_width )
 588                         continue;
 589
 590                     // Calculate the actual index in our source pixels
 591                     src_pixel_index = src_y * M_IMGDATA->m_width + src_x;
 592
 593                     sum_r += src_data[src_pixel_index * 3 + 0];
 594                     sum_g += src_data[src_pixel_index * 3 + 1];
 595                     sum_b += src_data[src_pixel_index * 3 + 2];
 596                     if ( src_alpha )
 597                         sum_a += src_alpha[src_pixel_index];
 598
 599                     averaged_pixels++;
 600                 }
 601             }
 602
 603             // Calculate the average from the sum and number of averaged pixels
 604             dst_data[0] = (unsigned char)(sum_r / averaged_pixels);
 605             dst_data[1] = (unsigned char)(sum_g / averaged_pixels);
 606             dst_data[2] = (unsigned char)(sum_b / averaged_pixels);
 607             dst_data += 3;
 608             if ( src_alpha )
 609                 *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels);
 610         }
 611     }
 612
 613     return ret_image;
 614 }
 615
 616 // The following two local functions are for the B-spline weighting of the
 617 // bicubic sampling algorithm
 618 static inline double spline_cube(double value)
 619 {
 620     return value <= 0.0 ? 0.0 : value * value * value;
 621 }
 622
 623 static inline double spline_weight(double value)
 624 {
 625     return (spline_cube(value + 2) -
 626             4 * spline_cube(value + 1) +
 627             6 * spline_cube(value) -
 628             4 * spline_cube(value - 1)) / 6;
 629 }
 630
 631 // This is the bicubic resampling algorithm
 632 wxImage wxImage::ResampleBicubic(int width, int height) const
 633 {
 634     // This function implements a Bicubic B-Spline algorithm for resampling.
 635     // This method is certainly a little slower than wxImage's default pixel
 636     // replication method, however for most reasonably sized images not being
 637     // upsampled too much on a fairly average CPU this difference is hardly
 638     // noticeable and the results are far more pleasing to look at.
 639     //
 640     // This particular bicubic algorithm does pixel weighting according to a
 641     // B-Spline that basically implements a Gaussian bell-like weighting
 642     // kernel. Because of this method the results may appear a bit blurry when
 643     // upsampling by large factors.  This is basically because a slight
 644     // gaussian blur is being performed to get the smooth look of the upsampled
 645     // image.
 646
 647     // Edge pixels: 3-4 possible solutions
 648     // - (Wrap/tile) Wrap the image, take the color value from the opposite
 649     // side of the image.
 650     // - (Mirror)    Duplicate edge pixels, so that pixel at coordinate (2, n),
 651     // where n is nonpositive, will have the value of (2, 1).
 652     // - (Ignore)    Simply ignore the edge pixels and apply the kernel only to
 653     // pixels which do have all neighbours.
 654     // - (Clamp)     Choose the nearest pixel along the border. This takes the
 655     // border pixels and extends them out to infinity.
 656     //
 657     // NOTE: below the y_offset and x_offset variables are being set for edge
 658     // pixels using the "Mirror" method mentioned above
 659
 660     wxImage ret_image;
 661
 662     ret_image.Create(width, height, false);
 663
 664     unsigned char* src_data = M_IMGDATA->m_data;
 665     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 666     unsigned char* dst_data = ret_image.GetData();
 667     unsigned char* dst_alpha = NULL;
 668
 669     if ( src_alpha )
 670     {
 671         ret_image.SetAlpha();
 672         dst_alpha = ret_image.GetAlpha();
 673     }
 674
 675     for ( int dsty = 0; dsty < height; dsty++ )
 676     {
 677         // We need to calculate the source pixel to interpolate from - Y-axis
 678         double srcpixy = dsty * M_IMGDATA->m_height / height;
 679         double dy = srcpixy - (int)srcpixy;
 680
 681         for ( int dstx = 0; dstx < width; dstx++ )
 682         {
 683             // X-axis of pixel to interpolate from
 684             double srcpixx = dstx * M_IMGDATA->m_width / width;
 685             double dx = srcpixx - (int)srcpixx;
 686
 687             // Sums for each color channel
 688             double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0;
 689
 690             // Here we actually determine the RGBA values for the destination pixel
 691             for ( int k = -1; k <= 2; k++ )
 692             {
 693                 // Y offset
 694                 int y_offset = srcpixy + k < 0.0
 695                                 ? 0
 696                                 : srcpixy + k >= M_IMGDATA->m_height
 697                                        ? M_IMGDATA->m_height - 1
 698                                        : (int)(srcpixy + k);
 699
 700                 // Loop across the X axis
 701                 for ( int i = -1; i <= 2; i++ )
 702                 {
 703                     // X offset
 704                     int x_offset = srcpixx + i < 0.0
 705                                     ? 0
 706                                     : srcpixx + i >= M_IMGDATA->m_width
 707                                             ? M_IMGDATA->m_width - 1
 708                                             : (int)(srcpixx + i);
 709
 710                     // Calculate the exact position where the source data
 711                     // should be pulled from based on the x_offset and y_offset
 712                     int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset;
 713
 714                     // Calculate the weight for the specified pixel according
 715                     // to the bicubic b-spline kernel we're using for
 716                     // interpolation
 717                     double
 718                         pixel_weight = spline_weight(i - dx)*spline_weight(k - dy);
 719
 720                     // Create a sum of all velues for each color channel
 721                     // adjusted for the pixel's calculated weight
 722                     sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight;
 723                     sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight;
 724                     sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight;
 725                     if ( src_alpha )
 726                         sum_a += src_alpha[src_pixel_index] * pixel_weight;
 727                 }
 728             }
 729
 730             // Put the data into the destination image.  The summed values are
 731             // of double data type and are rounded here for accuracy
 732             dst_data[0] = (unsigned char)(sum_r + 0.5);
 733             dst_data[1] = (unsigned char)(sum_g + 0.5);
 734             dst_data[2] = (unsigned char)(sum_b + 0.5);
 735             dst_data += 3;
 736
 737             if ( src_alpha )
 738                 *dst_alpha++ = (unsigned char)sum_a;
 739         }
 740     }
 741
 742     return ret_image;
 743 }
 744
 745 // Blur in the horizontal direction
 746 wxImage wxImage::BlurHorizontal(int blurRadius)
 747 {
 748     wxImage ret_image;
 749     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 750
 751     unsigned char* src_data = M_IMGDATA->m_data;
 752     unsigned char* dst_data = ret_image.GetData();
 753     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 754     unsigned char* dst_alpha = NULL;
 755
 756     // Check for a mask or alpha
 757     if ( src_alpha )
 758     {
 759         ret_image.SetAlpha();
 760         dst_alpha = ret_image.GetAlpha();
 761     }
 762     else if ( M_IMGDATA->m_hasMask )
 763     {
 764         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 765                                 M_IMGDATA->m_maskGreen,
 766                                 M_IMGDATA->m_maskBlue);
 767     }
 768
 769     // number of pixels we average over
 770     const int blurArea = blurRadius*2 + 1;
 771
 772     // Horizontal blurring algorithm - average all pixels in the specified blur
 773     // radius in the X or horizontal direction
 774     for ( int y = 0; y < M_IMGDATA->m_height; y++ )
 775     {
 776         // Variables used in the blurring algorithm
 777         long sum_r = 0,
 778              sum_g = 0,
 779              sum_b = 0,
 780              sum_a = 0;
 781
 782         long pixel_idx;
 783         const unsigned char *src;
 784         unsigned char *dst;
 785
 786         // Calculate the average of all pixels in the blur radius for the first
 787         // pixel of the row
 788         for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ )
 789         {
 790             // To deal with the pixels at the start of a row so it's not
 791             // grabbing GOK values from memory at negative indices of the
 792             // image's data or grabbing from the previous row
 793             if ( kernel_x < 0 )
 794                 pixel_idx = y * M_IMGDATA->m_width;
 795             else
 796                 pixel_idx = kernel_x + y * M_IMGDATA->m_width;
 797
 798             src = src_data + pixel_idx*3;
 799             sum_r += src[0];
 800             sum_g += src[1];
 801             sum_b += src[2];
 802             if ( src_alpha )
 803                 sum_a += src_alpha[pixel_idx];
 804         }
 805
 806         dst = dst_data + y * M_IMGDATA->m_width*3;
 807         dst[0] = (unsigned char)(sum_r / blurArea);
 808         dst[1] = (unsigned char)(sum_g / blurArea);
 809         dst[2] = (unsigned char)(sum_b / blurArea);
 810         if ( src_alpha )
 811             dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 812
 813         // Now average the values of the rest of the pixels by just moving the
 814         // blur radius box along the row
 815         for ( int x = 1; x < M_IMGDATA->m_width; x++ )
 816         {
 817             // Take care of edge pixels on the left edge by essentially
 818             // duplicating the edge pixel
 819             if ( x - blurRadius - 1 < 0 )
 820                 pixel_idx = y * M_IMGDATA->m_width;
 821             else
 822                 pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width;
 823
 824             // Subtract the value of the pixel at the left side of the blur
 825             // radius box
 826             src = src_data + pixel_idx*3;
 827             sum_r -= src[0];
 828             sum_g -= src[1];
 829             sum_b -= src[2];
 830             if ( src_alpha )
 831                 sum_a -= src_alpha[pixel_idx];
 832
 833             // Take care of edge pixels on the right edge
 834             if ( x + blurRadius > M_IMGDATA->m_width - 1 )
 835                 pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width;
 836             else
 837                 pixel_idx = x + blurRadius + y * M_IMGDATA->m_width;
 838
 839             // Add the value of the pixel being added to the end of our box
 840             src = src_data + pixel_idx*3;
 841             sum_r += src[0];
 842             sum_g += src[1];
 843             sum_b += src[2];
 844             if ( src_alpha )
 845                 sum_a += src_alpha[pixel_idx];
 846
 847             // Save off the averaged data
 848             dst = dst_data + x*3 + y*M_IMGDATA->m_width*3;
 849             dst[0] = (unsigned char)(sum_r / blurArea);
 850             dst[1] = (unsigned char)(sum_g / blurArea);
 851             dst[2] = (unsigned char)(sum_b / blurArea);
 852             if ( src_alpha )
 853                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 854         }
 855     }
 856
 857     return ret_image;
 858 }
 859
 860 // Blur in the vertical direction
 861 wxImage wxImage::BlurVertical(int blurRadius)
 862 {
 863     wxImage ret_image;
 864     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 865
 866     unsigned char* src_data = M_IMGDATA->m_data;
 867     unsigned char* dst_data = ret_image.GetData();
 868     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 869     unsigned char* dst_alpha = NULL;
 870
 871     // Check for a mask or alpha
 872     if ( src_alpha )
 873     {
 874         ret_image.SetAlpha();
 875         dst_alpha = ret_image.GetAlpha();
 876     }
 877     else if ( M_IMGDATA->m_hasMask )
 878     {
 879         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 880                                 M_IMGDATA->m_maskGreen,
 881                                 M_IMGDATA->m_maskBlue);
 882     }
 883
 884     // number of pixels we average over
 885     const int blurArea = blurRadius*2 + 1;
 886
 887     // Vertical blurring algorithm - same as horizontal but switched the
 888     // opposite direction
 889     for ( int x = 0; x < M_IMGDATA->m_width; x++ )
 890     {
 891         // Variables used in the blurring algorithm
 892         long sum_r = 0,
 893              sum_g = 0,
 894              sum_b = 0,
 895              sum_a = 0;
 896
 897         long pixel_idx;
 898         const unsigned char *src;
 899         unsigned char *dst;
 900
 901         // Calculate the average of all pixels in our blur radius box for the
 902         // first pixel of the column
 903         for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ )
 904         {
 905             // To deal with the pixels at the start of a column so it's not
 906             // grabbing GOK values from memory at negative indices of the
 907             // image's data or grabbing from the previous column
 908             if ( kernel_y < 0 )
 909                 pixel_idx = x;
 910             else
 911                 pixel_idx = x + kernel_y * M_IMGDATA->m_width;
 912
 913             src = src_data + pixel_idx*3;
 914             sum_r += src[0];
 915             sum_g += src[1];
 916             sum_b += src[2];
 917             if ( src_alpha )
 918                 sum_a += src_alpha[pixel_idx];
 919         }
 920
 921         dst = dst_data + x*3;
 922         dst[0] = (unsigned char)(sum_r / blurArea);
 923         dst[1] = (unsigned char)(sum_g / blurArea);
 924         dst[2] = (unsigned char)(sum_b / blurArea);
 925         if ( src_alpha )
 926             dst_alpha[x] = (unsigned char)(sum_a / blurArea);
 927
 928         // Now average the values of the rest of the pixels by just moving the
 929         // box along the column from top to bottom
 930         for ( int y = 1; y < M_IMGDATA->m_height; y++ )
 931         {
 932             // Take care of pixels that would be beyond the top edge by
 933             // duplicating the top edge pixel for the column
 934             if ( y - blurRadius - 1 < 0 )
 935                 pixel_idx = x;
 936             else
 937                 pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width;
 938
 939             // Subtract the value of the pixel at the top of our blur radius box
 940             src = src_data + pixel_idx*3;
 941             sum_r -= src[0];
 942             sum_g -= src[1];
 943             sum_b -= src[2];
 944             if ( src_alpha )
 945                 sum_a -= src_alpha[pixel_idx];
 946
 947             // Take care of the pixels that would be beyond the bottom edge of
 948             // the image similar to the top edge
 949             if ( y + blurRadius > M_IMGDATA->m_height - 1 )
 950                 pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width;
 951             else
 952                 pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width;
 953
 954             // Add the value of the pixel being added to the end of our box
 955             src = src_data + pixel_idx*3;
 956             sum_r += src[0];
 957             sum_g += src[1];
 958             sum_b += src[2];
 959             if ( src_alpha )
 960                 sum_a += src_alpha[pixel_idx];
 961
 962             // Save off the averaged data
 963             dst = dst_data + (x + y * M_IMGDATA->m_width) * 3;
 964             dst[0] = (unsigned char)(sum_r / blurArea);
 965             dst[1] = (unsigned char)(sum_g / blurArea);
 966             dst[2] = (unsigned char)(sum_b / blurArea);
 967             if ( src_alpha )
 968                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 969         }
 970     }
 971
 972     return ret_image;
 973 }
 974
 975 // The new blur function
 976 wxImage wxImage::Blur(int blurRadius)
 977 {
 978     wxImage ret_image;
 979     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 980
 981     // Blur the image in each direction
 982     ret_image = BlurHorizontal(blurRadius);
 983     ret_image = ret_image.BlurVertical(blurRadius);
 984
 985     return ret_image;
 986 }
 987
 988 wxImage wxImage::Rotate90( bool clockwise ) const
 989 {
 990     wxImage image;
 991
 992     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 993
 994     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 995
 996     unsigned char *data = image.GetData();
 997
 998     wxCHECK_MSG( data, image, wxT("unable to create image") );
 999
1000     unsigned char *source_data = M_IMGDATA->m_data;
1001     unsigned char *target_data;
1002     unsigned char *alpha_data = 0 ;
1003     unsigned char *source_alpha = 0 ;
1004     unsigned char *target_alpha = 0 ;
1005
1006     if (M_IMGDATA->m_hasMask)
1007     {
1008         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1009     }
1010     else
1011     {
1012         source_alpha = M_IMGDATA->m_alpha ;
1013         if ( source_alpha )
1014         {
1015             image.SetAlpha() ;
1016             alpha_data = image.GetAlpha() ;
1017         }
1018     }
1019
1020     long height = M_IMGDATA->m_height;
1021     long width  = M_IMGDATA->m_width;
1022
1023     for (long j = 0; j < height; j++)
1024     {
1025         for (long i = 0; i < width; i++)
1026         {
1027             if (clockwise)
1028             {
1029                 target_data = data + (((i+1)*height) - j - 1)*3;
1030                 if(source_alpha)
1031                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
1032             }
1033             else
1034             {
1035                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
1036                 if(source_alpha)
1037                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
1038             }
1039             memcpy( target_data, source_data, 3 );
1040             source_data += 3;
1041
1042             if(source_alpha)
1043             {
1044                 memcpy( target_alpha, source_alpha, 1 );
1045                 source_alpha += 1;
1046             }
1047         }
1048     }
1049
1050     return image;
1051 }
1052
1053 wxImage wxImage::Mirror( bool horizontally ) const
1054 {
1055     wxImage image;
1056
1057     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1058
1059     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1060
1061     unsigned char *data = image.GetData();
1062     unsigned char *alpha = NULL;
1063
1064     wxCHECK_MSG( data, image, wxT("unable to create image") );
1065
1066     if (M_IMGDATA->m_alpha != NULL) {
1067         image.SetAlpha();
1068         alpha = image.GetAlpha();
1069         wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
1070     }
1071
1072     if (M_IMGDATA->m_hasMask)
1073         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1074
1075     long height = M_IMGDATA->m_height;
1076     long width  = M_IMGDATA->m_width;
1077
1078     unsigned char *source_data = M_IMGDATA->m_data;
1079     unsigned char *target_data;
1080
1081     if (horizontally)
1082     {
1083         for (long j = 0; j < height; j++)
1084         {
1085             data += width*3;
1086             target_data = data-3;
1087             for (long i = 0; i < width; i++)
1088             {
1089                 memcpy( target_data, source_data, 3 );
1090                 source_data += 3;
1091                 target_data -= 3;
1092             }
1093         }
1094
1095         if (alpha != NULL)
1096         {
1097             // src_alpha starts at the first pixel and increases by 1 after each step
1098             // (a step here is the copy of the alpha value of one pixel)
1099             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1100             // dest_alpha starts just beyond the first line, decreases before each step,
1101             // and after each line is finished, increases by 2 widths (skipping the line
1102             // just copied and the line that will be copied next)
1103             unsigned char *dest_alpha = alpha + width;
1104
1105             for (long jj = 0; jj < height; ++jj)
1106             {
1107                 for (long i = 0; i < width; ++i) {
1108                     *(--dest_alpha) = *(src_alpha++); // copy one pixel
1109                 }
1110                 dest_alpha += 2 * width; // advance beyond the end of the next line
1111             }
1112         }
1113     }
1114     else
1115     {
1116         for (long i = 0; i < height; i++)
1117         {
1118             target_data = data + 3*width*(height-1-i);
1119             memcpy( target_data, source_data, (size_t)3*width );
1120             source_data += 3*width;
1121         }
1122
1123         if (alpha != NULL)
1124         {
1125             // src_alpha starts at the first pixel and increases by 1 width after each step
1126             // (a step here is the copy of the alpha channel of an entire line)
1127             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1128             // dest_alpha starts just beyond the last line (beyond the whole image)
1129             // and decreases by 1 width before each step
1130             unsigned char *dest_alpha = alpha + width * height;
1131
1132             for (long jj = 0; jj < height; ++jj)
1133             {
1134                 dest_alpha -= width;
1135                 memcpy( dest_alpha, src_alpha, (size_t)width );
1136                 src_alpha += width;
1137             }
1138         }
1139     }
1140
1141     return image;
1142 }
1143
1144 wxImage wxImage::GetSubImage( const wxRect &rect ) const
1145 {
1146     wxImage image;
1147
1148     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1149
1150     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
1151                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
1152                  image, wxT("invalid subimage size") );
1153
1154     const int subwidth = rect.GetWidth();
1155     const int subheight = rect.GetHeight();
1156
1157     image.Create( subwidth, subheight, false );
1158
1159     const unsigned char *src_data = GetData();
1160     const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1161     unsigned char *subdata = image.GetData();
1162     unsigned char *subalpha = NULL;
1163
1164     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
1165
1166     if (src_alpha != NULL) {
1167         image.SetAlpha();
1168         subalpha = image.GetAlpha();
1169         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
1170     }
1171
1172     if (M_IMGDATA->m_hasMask)
1173         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1174
1175     const int width = GetWidth();
1176     const int pixsoff = rect.GetLeft() + width * rect.GetTop();
1177
1178     src_data += 3 * pixsoff;
1179     src_alpha += pixsoff; // won't be used if was NULL, so this is ok
1180
1181     for (long j = 0; j < subheight; ++j)
1182     {
1183         memcpy( subdata, src_data, 3 * subwidth );
1184         subdata += 3 * subwidth;
1185         src_data += 3 * width;
1186         if (subalpha != NULL) {
1187             memcpy( subalpha, src_alpha, subwidth );
1188             subalpha += subwidth;
1189             src_alpha += width;
1190         }
1191     }
1192
1193     return image;
1194 }
1195
1196 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
1197                        int r_, int g_, int b_ ) const
1198 {
1199     wxImage image;
1200
1201     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1202     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
1203
1204     int width = GetWidth(), height = GetHeight();
1205     image.Create(size.GetWidth(), size.GetHeight(), false);
1206
1207     unsigned char r = (unsigned char)r_;
1208     unsigned char g = (unsigned char)g_;
1209     unsigned char b = (unsigned char)b_;
1210     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
1211     {
1212         GetOrFindMaskColour( &r, &g, &b );
1213         image.SetMaskColour(r, g, b);
1214     }
1215
1216     image.SetRGB(wxRect(), r, g, b);
1217
1218     wxRect subRect(pos.x, pos.y, width, height);
1219     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
1220     if (pos.x < 0)
1221         finalRect.width -= pos.x;
1222     if (pos.y < 0)
1223         finalRect.height -= pos.y;
1224
1225     subRect.Intersect(finalRect);
1226
1227     if (!subRect.IsEmpty())
1228     {
1229         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
1230             image.Paste(*this, pos.x, pos.y);
1231         else
1232             image.Paste(GetSubImage(subRect), pos.x, pos.y);
1233     }
1234
1235     return image;
1236 }
1237
1238 void wxImage::Paste( const wxImage &image, int x, int y )
1239 {
1240     wxCHECK_RET( Ok(), wxT("invalid image") );
1241     wxCHECK_RET( image.Ok(), wxT("invalid image") );
1242
1243     AllocExclusive();
1244
1245     int xx = 0;
1246     int yy = 0;
1247     int width = image.GetWidth();
1248     int height = image.GetHeight();
1249
1250     if (x < 0)
1251     {
1252         xx = -x;
1253         width += x;
1254     }
1255     if (y < 0)
1256     {
1257         yy = -y;
1258         height += y;
1259     }
1260
1261     if ((x+xx)+width > M_IMGDATA->m_width)
1262         width = M_IMGDATA->m_width - (x+xx);
1263     if ((y+yy)+height > M_IMGDATA->m_height)
1264         height = M_IMGDATA->m_height - (y+yy);
1265
1266     if (width < 1) return;
1267     if (height < 1) return;
1268
1269     if ((!HasMask() && !image.HasMask()) ||
1270         (HasMask() && !image.HasMask()) ||
1271        ((HasMask() && image.HasMask() &&
1272          (GetMaskRed()==image.GetMaskRed()) &&
1273          (GetMaskGreen()==image.GetMaskGreen()) &&
1274          (GetMaskBlue()==image.GetMaskBlue()))))
1275     {
1276         width *= 3;
1277         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1278         int source_step = image.GetWidth()*3;
1279
1280         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1281         int target_step = M_IMGDATA->m_width*3;
1282         for (int j = 0; j < height; j++)
1283         {
1284             memcpy( target_data, source_data, width );
1285             source_data += source_step;
1286             target_data += target_step;
1287         }
1288         return;
1289     }
1290
1291     if (!HasMask() && image.HasMask())
1292     {
1293         unsigned char r = image.GetMaskRed();
1294         unsigned char g = image.GetMaskGreen();
1295         unsigned char b = image.GetMaskBlue();
1296
1297         width *= 3;
1298         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1299         int source_step = image.GetWidth()*3;
1300
1301         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1302         int target_step = M_IMGDATA->m_width*3;
1303
1304         for (int j = 0; j < height; j++)
1305         {
1306             for (int i = 0; i < width; i+=3)
1307             {
1308                 if ((source_data[i]   != r) ||
1309                     (source_data[i+1] != g) ||
1310                     (source_data[i+2] != b))
1311                 {
1312                     memcpy( target_data+i, source_data+i, 3 );
1313                 }
1314             }
1315             source_data += source_step;
1316             target_data += target_step;
1317         }
1318     }
1319 }
1320
1321 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
1322                        unsigned char r2, unsigned char g2, unsigned char b2 )
1323 {
1324     wxCHECK_RET( Ok(), wxT("invalid image") );
1325
1326     AllocExclusive();
1327
1328     unsigned char *data = GetData();
1329
1330     const int w = GetWidth();
1331     const int h = GetHeight();
1332
1333     for (int j = 0; j < h; j++)
1334         for (int i = 0; i < w; i++)
1335         {
1336             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
1337             {
1338                 data[0] = r2;
1339                 data[1] = g2;
1340                 data[2] = b2;
1341             }
1342             data += 3;
1343         }
1344 }
1345
1346 wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
1347 {
1348     wxImage image;
1349
1350     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1351
1352     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1353
1354     unsigned char *dest = image.GetData();
1355
1356     wxCHECK_MSG( dest, image, wxT("unable to create image") );
1357
1358     unsigned char *src = M_IMGDATA->m_data;
1359     bool hasMask = M_IMGDATA->m_hasMask;
1360     unsigned char maskRed = M_IMGDATA->m_maskRed;
1361     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
1362     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
1363
1364     if ( hasMask )
1365         image.SetMaskColour(maskRed, maskGreen, maskBlue);
1366
1367     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
1368     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
1369     {
1370         // don't modify the mask
1371         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
1372         {
1373             memcpy(dest, src, 3);
1374         }
1375         else
1376         {
1377             // calculate the luma
1378             double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
1379             dest[0] = dest[1] = dest[2] = wx_static_cast(unsigned char, luma);
1380         }
1381     }
1382
1383     // copy the alpha channel, if any
1384     if (HasAlpha())
1385     {
1386         const size_t alphaSize = GetWidth() * GetHeight();
1387         unsigned char *alpha = (unsigned char*)malloc(alphaSize);
1388         memcpy(alpha, GetAlpha(), alphaSize);
1389         image.InitAlpha();
1390         image.SetAlpha(alpha);
1391     }
1392
1393     return image;
1394 }
1395
1396 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
1397 {
1398     wxImage image;
1399
1400     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1401
1402     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1403
1404     unsigned char *data = image.GetData();
1405
1406     wxCHECK_MSG( data, image, wxT("unable to create image") );
1407
1408     if (M_IMGDATA->m_hasMask)
1409     {
1410         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
1411                                          M_IMGDATA->m_maskBlue == b)
1412             image.SetMaskColour( 255, 255, 255 );
1413         else
1414             image.SetMaskColour( 0, 0, 0 );
1415     }
1416
1417     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
1418
1419     unsigned char *srcd = M_IMGDATA->m_data;
1420     unsigned char *tard = image.GetData();
1421
1422     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
1423     {
1424         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
1425             tard[0] = tard[1] = tard[2] = 255;
1426         else
1427             tard[0] = tard[1] = tard[2] = 0;
1428     }
1429
1430     return image;
1431 }
1432
1433 int wxImage::GetWidth() const
1434 {
1435     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1436
1437     return M_IMGDATA->m_width;
1438 }
1439
1440 int wxImage::GetHeight() const
1441 {
1442     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1443
1444     return M_IMGDATA->m_height;
1445 }
1446
1447 long wxImage::XYToIndex(int x, int y) const
1448 {
1449     if ( Ok() &&
1450             x >= 0 && y >= 0 &&
1451                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
1452     {
1453         return y*M_IMGDATA->m_width + x;
1454     }
1455
1456     return -1;
1457 }
1458
1459 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
1460 {
1461     long pos = XYToIndex(x, y);
1462     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1463
1464     AllocExclusive();
1465
1466     pos *= 3;
1467
1468     M_IMGDATA->m_data[ pos   ] = r;
1469     M_IMGDATA->m_data[ pos+1 ] = g;
1470     M_IMGDATA->m_data[ pos+2 ] = b;
1471 }
1472
1473 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
1474 {
1475     wxCHECK_RET( Ok(), wxT("invalid image") );
1476
1477     AllocExclusive();
1478
1479     wxRect rect(rect_);
1480     wxRect imageRect(0, 0, GetWidth(), GetHeight());
1481     if ( rect == wxRect() )
1482     {
1483         rect = imageRect;
1484     }
1485     else
1486     {
1487         wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
1488                      imageRect.Contains(rect.GetBottomRight()),
1489                      wxT("invalid bounding rectangle") );
1490     }
1491
1492     int x1 = rect.GetLeft(),
1493         y1 = rect.GetTop(),
1494         x2 = rect.GetRight() + 1,
1495         y2 = rect.GetBottom() + 1;
1496
1497     unsigned char *data wxDUMMY_INITIALIZE(NULL);
1498     int x, y, width = GetWidth();
1499     for (y = y1; y < y2; y++)
1500     {
1501         data = M_IMGDATA->m_data + (y*width + x1)*3;
1502         for (x = x1; x < x2; x++)
1503         {
1504             *data++ = r;
1505             *data++ = g;
1506             *data++ = b;
1507         }
1508     }
1509 }
1510
1511 unsigned char wxImage::GetRed( int x, int y ) const
1512 {
1513     long pos = XYToIndex(x, y);
1514     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1515
1516     pos *= 3;
1517
1518     return M_IMGDATA->m_data[pos];
1519 }
1520
1521 unsigned char wxImage::GetGreen( int x, int y ) const
1522 {
1523     long pos = XYToIndex(x, y);
1524     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1525
1526     pos *= 3;
1527
1528     return M_IMGDATA->m_data[pos+1];
1529 }
1530
1531 unsigned char wxImage::GetBlue( int x, int y ) const
1532 {
1533     long pos = XYToIndex(x, y);
1534     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1535
1536     pos *= 3;
1537
1538     return M_IMGDATA->m_data[pos+2];
1539 }
1540
1541 bool wxImage::IsOk() const
1542 {
1543     // image of 0 width or height can't be considered ok - at least because it
1544     // causes crashes in ConvertToBitmap() if we don't catch it in time
1545     wxImageRefData *data = M_IMGDATA;
1546     return data && data->m_ok && data->m_width && data->m_height;
1547 }
1548
1549 unsigned char *wxImage::GetData() const
1550 {
1551     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1552
1553     return M_IMGDATA->m_data;
1554 }
1555
1556 void wxImage::SetData( unsigned char *data, bool static_data  )
1557 {
1558     wxCHECK_RET( Ok(), wxT("invalid image") );
1559
1560     wxImageRefData *newRefData = new wxImageRefData();
1561
1562     newRefData->m_width = M_IMGDATA->m_width;
1563     newRefData->m_height = M_IMGDATA->m_height;
1564     newRefData->m_data = data;
1565     newRefData->m_ok = true;
1566     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1567     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1568     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1569     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1570     newRefData->m_static = static_data;
1571
1572     UnRef();
1573
1574     m_refData = newRefData;
1575 }
1576
1577 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1578 {
1579     wxImageRefData *newRefData = new wxImageRefData();
1580
1581     if (m_refData)
1582     {
1583         newRefData->m_width = new_width;
1584         newRefData->m_height = new_height;
1585         newRefData->m_data = data;
1586         newRefData->m_ok = true;
1587         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1588         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1589         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1590         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1591     }
1592     else
1593     {
1594         newRefData->m_width = new_width;
1595         newRefData->m_height = new_height;
1596         newRefData->m_data = data;
1597         newRefData->m_ok = true;
1598     }
1599     newRefData->m_static = static_data;
1600
1601     UnRef();
1602
1603     m_refData = newRefData;
1604 }
1605
1606 // ----------------------------------------------------------------------------
1607 // alpha channel support
1608 // ----------------------------------------------------------------------------
1609
1610 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1611 {
1612     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1613
1614     long pos = XYToIndex(x, y);
1615     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1616
1617     AllocExclusive();
1618
1619     M_IMGDATA->m_alpha[pos] = alpha;
1620 }
1621
1622 unsigned char wxImage::GetAlpha(int x, int y) const
1623 {
1624     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1625
1626     long pos = XYToIndex(x, y);
1627     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1628
1629     return M_IMGDATA->m_alpha[pos];
1630 }
1631
1632 bool
1633 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1634 {
1635     SetAlpha(NULL);
1636
1637     const int w = M_IMGDATA->m_width;
1638     const int h = M_IMGDATA->m_height;
1639
1640     unsigned char *alpha = GetAlpha();
1641     unsigned char *data = GetData();
1642
1643     for ( int y = 0; y < h; y++ )
1644     {
1645         for ( int x = 0; x < w; x++ )
1646         {
1647             *alpha++ = *data;
1648             *data++ = r;
1649             *data++ = g;
1650             *data++ = b;
1651         }
1652     }
1653
1654     return true;
1655 }
1656
1657 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1658 {
1659     wxCHECK_RET( Ok(), wxT("invalid image") );
1660
1661     AllocExclusive();
1662
1663     if ( !alpha )
1664     {
1665         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1666     }
1667
1668     free(M_IMGDATA->m_alpha);
1669     M_IMGDATA->m_alpha = alpha;
1670     M_IMGDATA->m_staticAlpha = static_data;
1671 }
1672
1673 unsigned char *wxImage::GetAlpha() const
1674 {
1675     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1676
1677     return M_IMGDATA->m_alpha;
1678 }
1679
1680 void wxImage::InitAlpha()
1681 {
1682     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1683
1684     // initialize memory for alpha channel
1685     SetAlpha();
1686
1687     unsigned char *alpha = M_IMGDATA->m_alpha;
1688     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1689
1690     if ( HasMask() )
1691     {
1692         // use the mask to initialize the alpha channel.
1693         const unsigned char * const alphaEnd = alpha + lenAlpha;
1694
1695         const unsigned char mr = M_IMGDATA->m_maskRed;
1696         const unsigned char mg = M_IMGDATA->m_maskGreen;
1697         const unsigned char mb = M_IMGDATA->m_maskBlue;
1698         for ( unsigned char *src = M_IMGDATA->m_data;
1699               alpha < alphaEnd;
1700               src += 3, alpha++ )
1701         {
1702             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1703                             ? wxIMAGE_ALPHA_TRANSPARENT
1704                             : wxIMAGE_ALPHA_OPAQUE;
1705         }
1706
1707         M_IMGDATA->m_hasMask = false;
1708     }
1709     else // no mask
1710     {
1711         // make the image fully opaque
1712         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1713     }
1714 }
1715
1716 // ----------------------------------------------------------------------------
1717 // mask support
1718 // ----------------------------------------------------------------------------
1719
1720 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1721 {
1722     wxCHECK_RET( Ok(), wxT("invalid image") );
1723
1724     AllocExclusive();
1725
1726     M_IMGDATA->m_maskRed = r;
1727     M_IMGDATA->m_maskGreen = g;
1728     M_IMGDATA->m_maskBlue = b;
1729     M_IMGDATA->m_hasMask = true;
1730 }
1731
1732 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1733 {
1734     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1735
1736     if (M_IMGDATA->m_hasMask)
1737     {
1738         if (r) *r = M_IMGDATA->m_maskRed;
1739         if (g) *g = M_IMGDATA->m_maskGreen;
1740         if (b) *b = M_IMGDATA->m_maskBlue;
1741         return true;
1742     }
1743     else
1744     {
1745         FindFirstUnusedColour(r, g, b);
1746         return false;
1747     }
1748 }
1749
1750 unsigned char wxImage::GetMaskRed() const
1751 {
1752     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1753
1754     return M_IMGDATA->m_maskRed;
1755 }
1756
1757 unsigned char wxImage::GetMaskGreen() const
1758 {
1759     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1760
1761     return M_IMGDATA->m_maskGreen;
1762 }
1763
1764 unsigned char wxImage::GetMaskBlue() const
1765 {
1766     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1767
1768     return M_IMGDATA->m_maskBlue;
1769 }
1770
1771 void wxImage::SetMask( bool mask )
1772 {
1773     wxCHECK_RET( Ok(), wxT("invalid image") );
1774
1775     AllocExclusive();
1776
1777     M_IMGDATA->m_hasMask = mask;
1778 }
1779
1780 bool wxImage::HasMask() const
1781 {
1782     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1783
1784     return M_IMGDATA->m_hasMask;
1785 }
1786
1787 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1788 {
1789     long pos = XYToIndex(x, y);
1790     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1791
1792     // check mask
1793     if ( M_IMGDATA->m_hasMask )
1794     {
1795         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1796         if ( p[0] == M_IMGDATA->m_maskRed &&
1797                 p[1] == M_IMGDATA->m_maskGreen &&
1798                     p[2] == M_IMGDATA->m_maskBlue )
1799         {
1800             return true;
1801         }
1802     }
1803
1804     // then check alpha
1805     if ( M_IMGDATA->m_alpha )
1806     {
1807         if ( M_IMGDATA->m_alpha[pos] < threshold )
1808         {
1809             // transparent enough
1810             return true;
1811         }
1812     }
1813
1814     // not transparent
1815     return false;
1816 }
1817
1818 bool wxImage::SetMaskFromImage(const wxImage& mask,
1819                                unsigned char mr, unsigned char mg, unsigned char mb)
1820 {
1821     // check that the images are the same size
1822     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1823     {
1824         wxLogError( _("Image and mask have different sizes.") );
1825         return false;
1826     }
1827
1828     // find unused colour
1829     unsigned char r,g,b ;
1830     if (!FindFirstUnusedColour(&r, &g, &b))
1831     {
1832         wxLogError( _("No unused colour in image being masked.") );
1833         return false ;
1834     }
1835
1836     AllocExclusive();
1837
1838     unsigned char *imgdata = GetData();
1839     unsigned char *maskdata = mask.GetData();
1840
1841     const int w = GetWidth();
1842     const int h = GetHeight();
1843
1844     for (int j = 0; j < h; j++)
1845     {
1846         for (int i = 0; i < w; i++)
1847         {
1848             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1849             {
1850                 imgdata[0] = r;
1851                 imgdata[1] = g;
1852                 imgdata[2] = b;
1853             }
1854             imgdata  += 3;
1855             maskdata += 3;
1856         }
1857     }
1858
1859     SetMaskColour(r, g, b);
1860     SetMask(true);
1861
1862     return true;
1863 }
1864
1865 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1866 {
1867     if (!HasAlpha())
1868         return true;
1869
1870     unsigned char mr, mg, mb;
1871     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1872     {
1873         wxLogError( _("No unused colour in image being masked.") );
1874         return false;
1875     }
1876
1877     AllocExclusive();
1878
1879     SetMask(true);
1880     SetMaskColour(mr, mg, mb);
1881
1882     unsigned char *imgdata = GetData();
1883     unsigned char *alphadata = GetAlpha();
1884
1885     int w = GetWidth();
1886     int h = GetHeight();
1887
1888     for (int y = 0; y < h; y++)
1889     {
1890         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1891         {
1892             if (*alphadata < threshold)
1893             {
1894                 imgdata[0] = mr;
1895                 imgdata[1] = mg;
1896                 imgdata[2] = mb;
1897             }
1898         }
1899     }
1900
1901     free(M_IMGDATA->m_alpha);
1902     M_IMGDATA->m_alpha = NULL;
1903
1904     return true;
1905 }
1906
1907 // ----------------------------------------------------------------------------
1908 // Palette functions
1909 // ----------------------------------------------------------------------------
1910
1911 #if wxUSE_PALETTE
1912
1913 bool wxImage::HasPalette() const
1914 {
1915     if (!Ok())
1916         return false;
1917
1918     return M_IMGDATA->m_palette.Ok();
1919 }
1920
1921 const wxPalette& wxImage::GetPalette() const
1922 {
1923     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1924
1925     return M_IMGDATA->m_palette;
1926 }
1927
1928 void wxImage::SetPalette(const wxPalette& palette)
1929 {
1930     wxCHECK_RET( Ok(), wxT("invalid image") );
1931
1932     AllocExclusive();
1933
1934     M_IMGDATA->m_palette = palette;
1935 }
1936
1937 #endif // wxUSE_PALETTE
1938
1939 // ----------------------------------------------------------------------------
1940 // Option functions (arbitrary name/value mapping)
1941 // ----------------------------------------------------------------------------
1942
1943 void wxImage::SetOption(const wxString& name, const wxString& value)
1944 {
1945     wxCHECK_RET( Ok(), wxT("invalid image") );
1946
1947     AllocExclusive();
1948
1949     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1950     if (idx == wxNOT_FOUND)
1951     {
1952         M_IMGDATA->m_optionNames.Add(name);
1953         M_IMGDATA->m_optionValues.Add(value);
1954     }
1955     else
1956     {
1957         M_IMGDATA->m_optionNames[idx] = name;
1958         M_IMGDATA->m_optionValues[idx] = value;
1959     }
1960 }
1961
1962 void wxImage::SetOption(const wxString& name, int value)
1963 {
1964     wxString valStr;
1965     valStr.Printf(wxT("%d"), value);
1966     SetOption(name, valStr);
1967 }
1968
1969 wxString wxImage::GetOption(const wxString& name) const
1970 {
1971     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1972
1973     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1974     if (idx == wxNOT_FOUND)
1975         return wxEmptyString;
1976     else
1977         return M_IMGDATA->m_optionValues[idx];
1978 }
1979
1980 int wxImage::GetOptionInt(const wxString& name) const
1981 {
1982     return wxAtoi(GetOption(name));
1983 }
1984
1985 bool wxImage::HasOption(const wxString& name) const
1986 {
1987     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1988
1989     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1990 }
1991
1992 // ----------------------------------------------------------------------------
1993 // image I/O
1994 // ----------------------------------------------------------------------------
1995
1996 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
1997                         long WXUNUSED_UNLESS_STREAMS(type),
1998                         int WXUNUSED_UNLESS_STREAMS(index) )
1999 {
2000 #if HAS_FILE_STREAMS
2001     if (wxFileExists(filename))
2002     {
2003         wxImageFileInputStream stream(filename);
2004         wxBufferedInputStream bstream( stream );
2005         return LoadFile(bstream, type, index);
2006     }
2007     else
2008     {
2009         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2010
2011         return false;
2012     }
2013 #else // !HAS_FILE_STREAMS
2014     return false;
2015 #endif // HAS_FILE_STREAMS
2016 }
2017
2018 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2019                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
2020                         int WXUNUSED_UNLESS_STREAMS(index) )
2021 {
2022 #if HAS_FILE_STREAMS
2023     if (wxFileExists(filename))
2024     {
2025         wxImageFileInputStream stream(filename);
2026         wxBufferedInputStream bstream( stream );
2027         return LoadFile(bstream, mimetype, index);
2028     }
2029     else
2030     {
2031         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2032
2033         return false;
2034     }
2035 #else // !HAS_FILE_STREAMS
2036     return false;
2037 #endif // HAS_FILE_STREAMS
2038 }
2039
2040
2041
2042 bool wxImage::SaveFile( const wxString& filename ) const
2043 {
2044     wxString ext = filename.AfterLast('.').Lower();
2045
2046     wxImageHandler * pHandler = FindHandler(ext, -1);
2047     if (pHandler)
2048     {
2049         SaveFile(filename, pHandler->GetType());
2050         return true;
2051     }
2052
2053     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
2054
2055     return false;
2056 }
2057
2058 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2059                         int WXUNUSED_UNLESS_STREAMS(type) ) const
2060 {
2061 #if HAS_FILE_STREAMS
2062     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2063
2064     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2065
2066     wxImageFileOutputStream stream(filename);
2067
2068     if ( stream.IsOk() )
2069     {
2070         wxBufferedOutputStream bstream( stream );
2071         return SaveFile(bstream, type);
2072     }
2073 #endif // HAS_FILE_STREAMS
2074
2075     return false;
2076 }
2077
2078 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2079                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
2080 {
2081 #if HAS_FILE_STREAMS
2082     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2083
2084     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2085
2086     wxImageFileOutputStream stream(filename);
2087
2088     if ( stream.IsOk() )
2089     {
2090         wxBufferedOutputStream bstream( stream );
2091         return SaveFile(bstream, mimetype);
2092     }
2093 #endif // HAS_FILE_STREAMS
2094
2095     return false;
2096 }
2097
2098 bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
2099 {
2100 #if HAS_FILE_STREAMS
2101     wxImageFileInputStream stream(name);
2102     return CanRead(stream);
2103 #else
2104     return false;
2105 #endif
2106 }
2107
2108 int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
2109                             long WXUNUSED_UNLESS_STREAMS(type) )
2110 {
2111 #if HAS_FILE_STREAMS
2112     wxImageFileInputStream stream(name);
2113     if (stream.Ok())
2114         return GetImageCount(stream, type);
2115 #endif
2116
2117   return 0;
2118 }
2119
2120 #if wxUSE_STREAMS
2121
2122 bool wxImage::CanRead( wxInputStream &stream )
2123 {
2124     const wxList& list = GetHandlers();
2125
2126     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2127     {
2128         wxImageHandler *handler=(wxImageHandler*)node->GetData();
2129         if (handler->CanRead( stream ))
2130             return true;
2131     }
2132
2133     return false;
2134 }
2135
2136 int wxImage::GetImageCount( wxInputStream &stream, long type )
2137 {
2138     wxImageHandler *handler;
2139
2140     if ( type == wxBITMAP_TYPE_ANY )
2141     {
2142         wxList &list=GetHandlers();
2143
2144         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
2145         {
2146              handler=(wxImageHandler*)node->GetData();
2147              if ( handler->CanRead(stream) )
2148                  return handler->GetImageCount(stream);
2149
2150         }
2151
2152         wxLogWarning(_("No handler found for image type."));
2153         return 0;
2154     }
2155
2156     handler = FindHandler(type);
2157
2158     if ( !handler )
2159     {
2160         wxLogWarning(_("No image handler for type %ld defined."), type);
2161         return false;
2162     }
2163
2164     if ( handler->CanRead(stream) )
2165     {
2166         return handler->GetImageCount(stream);
2167     }
2168     else
2169     {
2170         wxLogError(_("Image file is not of type %ld."), type);
2171         return 0;
2172     }
2173 }
2174
2175 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
2176 {
2177     UnRef();
2178
2179     m_refData = new wxImageRefData;
2180
2181     wxImageHandler *handler;
2182
2183     if ( type == wxBITMAP_TYPE_ANY )
2184     {
2185         wxList &list=GetHandlers();
2186
2187         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2188         {
2189              handler=(wxImageHandler*)node->GetData();
2190              if ( handler->CanRead(stream) )
2191                  return handler->LoadFile(this, stream, true/*verbose*/, index);
2192
2193         }
2194
2195         wxLogWarning( _("No handler found for image type.") );
2196         return false;
2197     }
2198
2199     handler = FindHandler(type);
2200
2201     if (handler == 0)
2202     {
2203         wxLogWarning( _("No image handler for type %ld defined."), type );
2204
2205         return false;
2206     }
2207
2208     if (stream.IsSeekable() && !handler->CanRead(stream))
2209     {
2210         wxLogError(_("Image file is not of type %ld."), type);
2211         return false;
2212     }
2213     else
2214         return handler->LoadFile(this, stream, true/*verbose*/, index);
2215 }
2216
2217 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
2218 {
2219     UnRef();
2220
2221     m_refData = new wxImageRefData;
2222
2223     wxImageHandler *handler = FindHandlerMime(mimetype);
2224
2225     if (handler == 0)
2226     {
2227         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2228
2229         return false;
2230     }
2231
2232     if (stream.IsSeekable() && !handler->CanRead(stream))
2233     {
2234         wxLogError(_("Image file is not of type %s."), (const wxChar*) mimetype);
2235         return false;
2236     }
2237     else
2238         return handler->LoadFile( this, stream, true/*verbose*/, index );
2239 }
2240
2241 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
2242 {
2243     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2244
2245     wxImageHandler *handler = FindHandler(type);
2246     if ( !handler )
2247     {
2248         wxLogWarning( _("No image handler for type %d defined."), type );
2249
2250         return false;
2251     }
2252
2253     return handler->SaveFile( (wxImage*)this, stream );
2254 }
2255
2256 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
2257 {
2258     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2259
2260     wxImageHandler *handler = FindHandlerMime(mimetype);
2261     if ( !handler )
2262     {
2263         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2264
2265         return false;
2266     }
2267
2268     return handler->SaveFile( (wxImage*)this, stream );
2269 }
2270 #endif // wxUSE_STREAMS
2271
2272 // ----------------------------------------------------------------------------
2273 // image I/O handlers
2274 // ----------------------------------------------------------------------------
2275
2276 void wxImage::AddHandler( wxImageHandler *handler )
2277 {
2278     // Check for an existing handler of the type being added.
2279     if (FindHandler( handler->GetType() ) == 0)
2280     {
2281         sm_handlers.Append( handler );
2282     }
2283     else
2284     {
2285         // This is not documented behaviour, merely the simplest 'fix'
2286         // for preventing duplicate additions.  If someone ever has
2287         // a good reason to add and remove duplicate handlers (and they
2288         // may) we should probably refcount the duplicates.
2289         //   also an issue in InsertHandler below.
2290
2291         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
2292                     handler->GetName().c_str() );
2293         delete handler;
2294     }
2295 }
2296
2297 void wxImage::InsertHandler( wxImageHandler *handler )
2298 {
2299     // Check for an existing handler of the type being added.
2300     if (FindHandler( handler->GetType() ) == 0)
2301     {
2302         sm_handlers.Insert( handler );
2303     }
2304     else
2305     {
2306         // see AddHandler for additional comments.
2307         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
2308                     handler->GetName().c_str() );
2309         delete handler;
2310     }
2311 }
2312
2313 bool wxImage::RemoveHandler( const wxString& name )
2314 {
2315     wxImageHandler *handler = FindHandler(name);
2316     if (handler)
2317     {
2318         sm_handlers.DeleteObject(handler);
2319         delete handler;
2320         return true;
2321     }
2322     else
2323         return false;
2324 }
2325
2326 wxImageHandler *wxImage::FindHandler( const wxString& name )
2327 {
2328     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2329     while (node)
2330     {
2331         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2332         if (handler->GetName().Cmp(name) == 0) return handler;
2333
2334         node = node->GetNext();
2335     }
2336     return 0;
2337 }
2338
2339 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
2340 {
2341     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2342     while (node)
2343     {
2344         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2345         if ( (handler->GetExtension().Cmp(extension) == 0) &&
2346             (bitmapType == -1 || handler->GetType() == bitmapType) )
2347             return handler;
2348         node = node->GetNext();
2349     }
2350     return 0;
2351 }
2352
2353 wxImageHandler *wxImage::FindHandler( long bitmapType )
2354 {
2355     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2356     while (node)
2357     {
2358         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2359         if (handler->GetType() == bitmapType) return handler;
2360         node = node->GetNext();
2361     }
2362     return 0;
2363 }
2364
2365 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
2366 {
2367     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2368     while (node)
2369     {
2370         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2371         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
2372         node = node->GetNext();
2373     }
2374     return 0;
2375 }
2376
2377 void wxImage::InitStandardHandlers()
2378 {
2379 #if wxUSE_STREAMS
2380     AddHandler(new wxBMPHandler);
2381 #endif // wxUSE_STREAMS
2382 }
2383
2384 void wxImage::CleanUpHandlers()
2385 {
2386     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2387     while (node)
2388     {
2389         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2390         wxList::compatibility_iterator next = node->GetNext();
2391         delete handler;
2392         node = next;
2393     }
2394
2395     sm_handlers.Clear();
2396 }
2397
2398 wxString wxImage::GetImageExtWildcard()
2399 {
2400     wxString fmts;
2401
2402     wxList& Handlers = wxImage::GetHandlers();
2403     wxList::compatibility_iterator Node = Handlers.GetFirst();
2404     while ( Node )
2405     {
2406         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
2407         fmts += wxT("*.") + Handler->GetExtension();
2408         Node = Node->GetNext();
2409         if ( Node ) fmts += wxT(";");
2410     }
2411
2412     return wxT("(") + fmts + wxT(")|") + fmts;
2413 }
2414
2415 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
2416 {
2417     const double red = rgb.red / 255.0,
2418                  green = rgb.green / 255.0,
2419                  blue = rgb.blue / 255.0;
2420
2421     // find the min and max intensity (and remember which one was it for the
2422     // latter)
2423     double minimumRGB = red;
2424     if ( green < minimumRGB )
2425         minimumRGB = green;
2426     if ( blue < minimumRGB )
2427         minimumRGB = blue;
2428
2429     enum { RED, GREEN, BLUE } chMax = RED;
2430     double maximumRGB = red;
2431     if ( green > maximumRGB )
2432     {
2433         chMax = GREEN;
2434         maximumRGB = green;
2435     }
2436     if ( blue > maximumRGB )
2437     {
2438         chMax = BLUE;
2439         maximumRGB = blue;
2440     }
2441
2442     const double value = maximumRGB;
2443
2444     double hue = 0.0, saturation;
2445     const double deltaRGB = maximumRGB - minimumRGB;
2446     if ( wxIsNullDouble(deltaRGB) )
2447     {
2448         // Gray has no color
2449         hue = 0.0;
2450         saturation = 0.0;
2451     }
2452     else
2453     {
2454         switch ( chMax )
2455         {
2456             case RED:
2457                 hue = (green - blue) / deltaRGB;
2458                 break;
2459
2460             case GREEN:
2461                 hue = 2.0 + (blue - red) / deltaRGB;
2462                 break;
2463
2464             case BLUE:
2465                 hue = 4.0 + (red - green) / deltaRGB;
2466                 break;
2467
2468             default:
2469                 wxFAIL_MSG(wxT("hue not specified"));
2470                 break;
2471         }
2472
2473         hue /= 6.0;
2474
2475         if ( hue < 0.0 )
2476             hue += 1.0;
2477
2478         saturation = deltaRGB / maximumRGB;
2479     }
2480
2481     return HSVValue(hue, saturation, value);
2482 }
2483
2484 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
2485 {
2486     double red, green, blue;
2487
2488     if ( wxIsNullDouble(hsv.saturation) )
2489     {
2490         // Grey
2491         red = hsv.value;
2492         green = hsv.value;
2493         blue = hsv.value;
2494     }
2495     else // not grey
2496     {
2497         double hue = hsv.hue * 6.0;      // sector 0 to 5
2498         int i = (int)floor(hue);
2499         double f = hue - i;          // fractional part of h
2500         double p = hsv.value * (1.0 - hsv.saturation);
2501
2502         switch (i)
2503         {
2504             case 0:
2505                 red = hsv.value;
2506                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2507                 blue = p;
2508                 break;
2509
2510             case 1:
2511                 red = hsv.value * (1.0 - hsv.saturation * f);
2512                 green = hsv.value;
2513                 blue = p;
2514                 break;
2515
2516             case 2:
2517                 red = p;
2518                 green = hsv.value;
2519                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2520                 break;
2521
2522             case 3:
2523                 red = p;
2524                 green = hsv.value * (1.0 - hsv.saturation * f);
2525                 blue = hsv.value;
2526                 break;
2527
2528             case 4:
2529                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2530                 green = p;
2531                 blue = hsv.value;
2532                 break;
2533
2534             default:    // case 5:
2535                 red = hsv.value;
2536                 green = p;
2537                 blue = hsv.value * (1.0 - hsv.saturation * f);
2538                 break;
2539         }
2540     }
2541
2542     return RGBValue((unsigned char)(red * 255.0),
2543                     (unsigned char)(green * 255.0),
2544                     (unsigned char)(blue * 255.0));
2545 }
2546
2547 /*
2548  * Rotates the hue of each pixel of the image. angle is a double in the range
2549  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2550  */
2551 void wxImage::RotateHue(double angle)
2552 {
2553     AllocExclusive();
2554
2555     unsigned char *srcBytePtr;
2556     unsigned char *dstBytePtr;
2557     unsigned long count;
2558     wxImage::HSVValue hsv;
2559     wxImage::RGBValue rgb;
2560
2561     wxASSERT (angle >= -1.0 && angle <= 1.0);
2562     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2563     if ( count > 0 && !wxIsNullDouble(angle) )
2564     {
2565         srcBytePtr = M_IMGDATA->m_data;
2566         dstBytePtr = srcBytePtr;
2567         do
2568         {
2569             rgb.red = *srcBytePtr++;
2570             rgb.green = *srcBytePtr++;
2571             rgb.blue = *srcBytePtr++;
2572             hsv = RGBtoHSV(rgb);
2573
2574             hsv.hue = hsv.hue + angle;
2575             if (hsv.hue > 1.0)
2576                 hsv.hue = hsv.hue - 1.0;
2577             else if (hsv.hue < 0.0)
2578                 hsv.hue = hsv.hue + 1.0;
2579
2580             rgb = HSVtoRGB(hsv);
2581             *dstBytePtr++ = rgb.red;
2582             *dstBytePtr++ = rgb.green;
2583             *dstBytePtr++ = rgb.blue;
2584         } while (--count != 0);
2585     }
2586 }
2587
2588 //-----------------------------------------------------------------------------
2589 // wxImageHandler
2590 //-----------------------------------------------------------------------------
2591
2592 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2593
2594 #if wxUSE_STREAMS
2595 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
2596 {
2597     return false;
2598 }
2599
2600 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
2601 {
2602     return false;
2603 }
2604
2605 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
2606 {
2607     return 1;
2608 }
2609
2610 bool wxImageHandler::CanRead( const wxString& name )
2611 {
2612     if (wxFileExists(name))
2613     {
2614         wxImageFileInputStream stream(name);
2615         return CanRead(stream);
2616     }
2617
2618     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2619
2620     return false;
2621 }
2622
2623 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2624 {
2625     wxFileOffset posOld = stream.TellI();
2626     if ( posOld == wxInvalidOffset )
2627     {
2628         // can't test unseekable stream
2629         return false;
2630     }
2631
2632     bool ok = DoCanRead(stream);
2633
2634     // restore the old position to be able to test other formats and so on
2635     if ( stream.SeekI(posOld) == wxInvalidOffset )
2636     {
2637         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
2638
2639         // reading would fail anyhow as we're not at the right position
2640         return false;
2641     }
2642
2643     return ok;
2644 }
2645
2646 #endif // wxUSE_STREAMS
2647
2648 // ----------------------------------------------------------------------------
2649 // image histogram stuff
2650 // ----------------------------------------------------------------------------
2651
2652 bool
2653 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2654                                         unsigned char *g,
2655                                         unsigned char *b,
2656                                         unsigned char r2,
2657                                         unsigned char b2,
2658                                         unsigned char g2) const
2659 {
2660     unsigned long key = MakeKey(r2, g2, b2);
2661
2662     while ( find(key) != end() )
2663     {
2664         // color already used
2665         r2++;
2666         if ( r2 >= 255 )
2667         {
2668             r2 = 0;
2669             g2++;
2670             if ( g2 >= 255 )
2671             {
2672                 g2 = 0;
2673                 b2++;
2674                 if ( b2 >= 255 )
2675                 {
2676                     wxLogError(_("No unused colour in image.") );
2677                     return false;
2678                 }
2679             }
2680         }
2681
2682         key = MakeKey(r2, g2, b2);
2683     }
2684
2685     if ( r )
2686         *r = r2;
2687     if ( g )
2688         *g = g2;
2689     if ( b )
2690         *b = b2;
2691
2692     return true;
2693 }
2694
2695 bool
2696 wxImage::FindFirstUnusedColour(unsigned char *r,
2697                                unsigned char *g,
2698                                unsigned char *b,
2699                                unsigned char r2,
2700                                unsigned char b2,
2701                                unsigned char g2) const
2702 {
2703     wxImageHistogram histogram;
2704
2705     ComputeHistogram(histogram);
2706
2707     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2708 }
2709
2710
2711
2712 // GRG, Dic/99
2713 // Counts and returns the number of different colours. Optionally stops
2714 // when it exceeds 'stopafter' different colours. This is useful, for
2715 // example, to see if the image can be saved as 8-bit (256 colour or
2716 // less, in this case it would be invoked as CountColours(256)). Default
2717 // value for stopafter is -1 (don't care).
2718 //
2719 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2720 {
2721     wxHashTable h;
2722     wxObject dummy;
2723     unsigned char r, g, b;
2724     unsigned char *p;
2725     unsigned long size, nentries, key;
2726
2727     p = GetData();
2728     size = GetWidth() * GetHeight();
2729     nentries = 0;
2730
2731     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2732     {
2733         r = *(p++);
2734         g = *(p++);
2735         b = *(p++);
2736         key = wxImageHistogram::MakeKey(r, g, b);
2737
2738         if (h.Get(key) == NULL)
2739         {
2740             h.Put(key, &dummy);
2741             nentries++;
2742         }
2743     }
2744
2745     return nentries;
2746 }
2747
2748
2749 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2750 {
2751     unsigned char *p = GetData();
2752     unsigned long nentries = 0;
2753
2754     h.clear();
2755
2756     const unsigned long size = GetWidth() * GetHeight();
2757
2758     unsigned char r, g, b;
2759     for ( unsigned long n = 0; n < size; n++ )
2760     {
2761         r = *p++;
2762         g = *p++;
2763         b = *p++;
2764
2765         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2766
2767         if ( entry.value++ == 0 )
2768             entry.index = nentries++;
2769     }
2770
2771     return nentries;
2772 }
2773
2774 /*
2775  * Rotation code by Carlos Moreno
2776  */
2777
2778 static const double wxROTATE_EPSILON = 1e-10;
2779
2780 // Auxiliary function to rotate a point (x,y) with respect to point p0
2781 // make it inline and use a straight return to facilitate optimization
2782 // also, the function receives the sine and cosine of the angle to avoid
2783 // repeating the time-consuming calls to these functions -- sin/cos can
2784 // be computed and stored in the calling function.
2785
2786 static inline wxRealPoint
2787 wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
2788               const wxRealPoint& p0)
2789 {
2790     return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2791                        p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2792 }
2793
2794 static inline wxRealPoint
2795 wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
2796               const wxRealPoint & p0)
2797 {
2798     return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
2799 }
2800
2801 wxImage wxImage::Rotate(double angle,
2802                         const wxPoint& centre_of_rotation,
2803                         bool interpolating,
2804                         wxPoint *offset_after_rotation) const
2805 {
2806     // screen coordinates are a mirror image of "real" coordinates
2807     angle = -angle;
2808
2809     const bool has_alpha = HasAlpha();
2810
2811     const int w = GetWidth();
2812     const int h = GetHeight();
2813
2814     int i;
2815
2816     // Create pointer-based array to accelerate access to wxImage's data
2817     unsigned char ** data = new unsigned char * [h];
2818     data[0] = GetData();
2819     for (i = 1; i < h; i++)
2820         data[i] = data[i - 1] + (3 * w);
2821
2822     // Same for alpha channel
2823     unsigned char ** alpha = NULL;
2824     if (has_alpha)
2825     {
2826         alpha = new unsigned char * [h];
2827         alpha[0] = GetAlpha();
2828         for (i = 1; i < h; i++)
2829             alpha[i] = alpha[i - 1] + w;
2830     }
2831
2832     // precompute coefficients for rotation formula
2833     const double cos_angle = cos(angle);
2834     const double sin_angle = sin(angle);
2835
2836     // Create new Image to store the result
2837     // First, find rectangle that covers the rotated image;  to do that,
2838     // rotate the four corners
2839
2840     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
2841
2842     wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
2843     wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
2844     wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
2845     wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
2846
2847     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
2848     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
2849     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
2850     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
2851
2852     // Create rotated image
2853     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
2854     // With alpha channel
2855     if (has_alpha)
2856         rotated.SetAlpha();
2857
2858     if (offset_after_rotation != NULL)
2859     {
2860         *offset_after_rotation = wxPoint (x1a, y1a);
2861     }
2862
2863     // the rotated (destination) image is always accessed sequentially via this
2864     // pointer, there is no need for pointer-based arrays here
2865     unsigned char *dst = rotated.GetData();
2866
2867     unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
2868
2869     // if the original image has a mask, use its RGB values as the blank pixel,
2870     // else, fall back to default (black).
2871     unsigned char blank_r = 0;
2872     unsigned char blank_g = 0;
2873     unsigned char blank_b = 0;
2874
2875     if (HasMask())
2876     {
2877         blank_r = GetMaskRed();
2878         blank_g = GetMaskGreen();
2879         blank_b = GetMaskBlue();
2880         rotated.SetMaskColour( blank_r, blank_g, blank_b );
2881     }
2882
2883     // Now, for each point of the rotated image, find where it came from, by
2884     // performing an inverse rotation (a rotation of -angle) and getting the
2885     // pixel at those coordinates
2886
2887     const int rH = rotated.GetHeight();
2888     const int rW = rotated.GetWidth();
2889
2890     // do the (interpolating) test outside of the loops, so that it is done
2891     // only once, instead of repeating it for each pixel.
2892     if (interpolating)
2893     {
2894         for (int y = 0; y < rH; y++)
2895         {
2896             for (int x = 0; x < rW; x++)
2897             {
2898                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
2899
2900                 if (-0.25 < src.x && src.x < w - 0.75 &&
2901                     -0.25 < src.y && src.y < h - 0.75)
2902                 {
2903                     // interpolate using the 4 enclosing grid-points.  Those
2904                     // points can be obtained using floor and ceiling of the
2905                     // exact coordinates of the point
2906                     int x1, y1, x2, y2;
2907
2908                     if (0 < src.x && src.x < w - 1)
2909                     {
2910                         x1 = wxRound(floor(src.x));
2911                         x2 = wxRound(ceil(src.x));
2912                     }
2913                     else    // else means that x is near one of the borders (0 or width-1)
2914                     {
2915                         x1 = x2 = wxRound (src.x);
2916                     }
2917
2918                     if (0 < src.y && src.y < h - 1)
2919                     {
2920                         y1 = wxRound(floor(src.y));
2921                         y2 = wxRound(ceil(src.y));
2922                     }
2923                     else
2924                     {
2925                         y1 = y2 = wxRound (src.y);
2926                     }
2927
2928                     // get four points and the distances (square of the distance,
2929                     // for efficiency reasons) for the interpolation formula
2930
2931                     // GRG: Do not calculate the points until they are
2932                     //      really needed -- this way we can calculate
2933                     //      just one, instead of four, if d1, d2, d3
2934                     //      or d4 are < wxROTATE_EPSILON
2935
2936                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
2937                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
2938                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
2939                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
2940
2941                     // Now interpolate as a weighted average of the four surrounding
2942                     // points, where the weights are the distances to each of those points
2943
2944                     // If the point is exactly at one point of the grid of the source
2945                     // image, then don't interpolate -- just assign the pixel
2946
2947                     // d1,d2,d3,d4 are positive -- no need for abs()
2948                     if (d1 < wxROTATE_EPSILON)
2949                     {
2950                         unsigned char *p = data[y1] + (3 * x1);
2951                         *(dst++) = *(p++);
2952                         *(dst++) = *(p++);
2953                         *(dst++) = *p;
2954
2955                         if (has_alpha)
2956                             *(alpha_dst++) = *(alpha[y1] + x1);
2957                     }
2958                     else if (d2 < wxROTATE_EPSILON)
2959                     {
2960                         unsigned char *p = data[y1] + (3 * x2);
2961                         *(dst++) = *(p++);
2962                         *(dst++) = *(p++);
2963                         *(dst++) = *p;
2964
2965                         if (has_alpha)
2966                             *(alpha_dst++) = *(alpha[y1] + x2);
2967                     }
2968                     else if (d3 < wxROTATE_EPSILON)
2969                     {
2970                         unsigned char *p = data[y2] + (3 * x2);
2971                         *(dst++) = *(p++);
2972                         *(dst++) = *(p++);
2973                         *(dst++) = *p;
2974
2975                         if (has_alpha)
2976                             *(alpha_dst++) = *(alpha[y2] + x2);
2977                     }
2978                     else if (d4 < wxROTATE_EPSILON)
2979                     {
2980                         unsigned char *p = data[y2] + (3 * x1);
2981                         *(dst++) = *(p++);
2982                         *(dst++) = *(p++);
2983                         *(dst++) = *p;
2984
2985                         if (has_alpha)
2986                             *(alpha_dst++) = *(alpha[y2] + x1);
2987                     }
2988                     else
2989                     {
2990                         // weights for the weighted average are proportional to the inverse of the distance
2991                         unsigned char *v1 = data[y1] + (3 * x1);
2992                         unsigned char *v2 = data[y1] + (3 * x2);
2993                         unsigned char *v3 = data[y2] + (3 * x2);
2994                         unsigned char *v4 = data[y2] + (3 * x1);
2995
2996                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
2997
2998                         // GRG: Unrolled.
2999
3000                         *(dst++) = (unsigned char)
3001                             ( (w1 * *(v1++) + w2 * *(v2++) +
3002                                w3 * *(v3++) + w4 * *(v4++)) /
3003                               (w1 + w2 + w3 + w4) );
3004                         *(dst++) = (unsigned char)
3005                             ( (w1 * *(v1++) + w2 * *(v2++) +
3006                                w3 * *(v3++) + w4 * *(v4++)) /
3007                               (w1 + w2 + w3 + w4) );
3008                         *(dst++) = (unsigned char)
3009                             ( (w1 * *v1 + w2 * *v2 +
3010                                w3 * *v3 + w4 * *v4) /
3011                               (w1 + w2 + w3 + w4) );
3012
3013                         if (has_alpha)
3014                         {
3015                             v1 = alpha[y1] + (x1);
3016                             v2 = alpha[y1] + (x2);
3017                             v3 = alpha[y2] + (x2);
3018                             v4 = alpha[y2] + (x1);
3019
3020                             *(alpha_dst++) = (unsigned char)
3021                                 ( (w1 * *v1 + w2 * *v2 +
3022                                    w3 * *v3 + w4 * *v4) /
3023                                   (w1 + w2 + w3 + w4) );
3024                         }
3025                     }
3026                 }
3027                 else
3028                 {
3029                     *(dst++) = blank_r;
3030                     *(dst++) = blank_g;
3031                     *(dst++) = blank_b;
3032
3033                     if (has_alpha)
3034                         *(alpha_dst++) = 0;
3035                 }
3036             }
3037         }
3038     }
3039     else // not interpolating
3040     {
3041         for (int y = 0; y < rH; y++)
3042         {
3043             for (int x = 0; x < rW; x++)
3044             {
3045                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3046
3047                 const int xs = wxRound (src.x);      // wxRound rounds to the
3048                 const int ys = wxRound (src.y);      // closest integer
3049
3050                 if (0 <= xs && xs < w && 0 <= ys && ys < h)
3051                 {
3052                     unsigned char *p = data[ys] + (3 * xs);
3053                     *(dst++) = *(p++);
3054                     *(dst++) = *(p++);
3055                     *(dst++) = *p;
3056
3057                     if (has_alpha)
3058                         *(alpha_dst++) = *(alpha[ys] + (xs));
3059                 }
3060                 else
3061                 {
3062                     *(dst++) = blank_r;
3063                     *(dst++) = blank_g;
3064                     *(dst++) = blank_b;
3065
3066                     if (has_alpha)
3067                         *(alpha_dst++) = 255;
3068                 }
3069             }
3070         }
3071     }
3072
3073     delete [] data;
3074     delete [] alpha;
3075
3076     return rotated;
3077 }
3078
3079
3080
3081
3082
3083 // A module to allow wxImage initialization/cleanup
3084 // without calling these functions from app.cpp or from
3085 // the user's application.
3086
3087 class wxImageModule: public wxModule
3088 {
3089 DECLARE_DYNAMIC_CLASS(wxImageModule)
3090 public:
3091     wxImageModule() {}
3092     bool OnInit() { wxImage::InitStandardHandlers(); return true; }
3093     void OnExit() { wxImage::CleanUpHandlers(); }
3094 };
3095
3096 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
3097
3098
3099 #endif // wxUSE_IMAGE