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     #include "wx/colour.h"
  30 #endif
  31
  32 #include "wx/filefn.h"
  33 #include "wx/wfstream.h"
  34 #include "wx/xpmdecod.h"
  35
  36 // For memcpy
  37 #include <string.h>
  38
  39 // make the code compile with either wxFile*Stream or wxFFile*Stream:
  40 #define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE))
  41
  42 #if HAS_FILE_STREAMS
  43     #if wxUSE_FFILE
  44         typedef wxFFileInputStream wxImageFileInputStream;
  45         typedef wxFFileOutputStream wxImageFileOutputStream;
  46     #elif wxUSE_FILE
  47         typedef wxFileInputStream wxImageFileInputStream;
  48         typedef wxFileOutputStream wxImageFileOutputStream;
  49     #endif // wxUSE_FILE/wxUSE_FFILE
  50 #endif // HAS_FILE_STREAMS
  51
  52 #if wxUSE_VARIANT
  53 IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT)
  54 #endif
  55
  56 //-----------------------------------------------------------------------------
  57 // global data
  58 //-----------------------------------------------------------------------------
  59
  60 wxList wxImage::sm_handlers;
  61 wxImage wxNullImage;
  62
  63 //-----------------------------------------------------------------------------
  64 // wxImageRefData
  65 //-----------------------------------------------------------------------------
  66
  67 class wxImageRefData: public wxObjectRefData
  68 {
  69 public:
  70     wxImageRefData();
  71     virtual ~wxImageRefData();
  72
  73     int             m_width;
  74     int             m_height;
  75     wxBitmapType    m_type;
  76     unsigned char  *m_data;
  77
  78     bool            m_hasMask;
  79     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  80
  81     // alpha channel data, may be NULL for the formats without alpha support
  82     unsigned char  *m_alpha;
  83
  84     bool            m_ok;
  85
  86     // if true, m_data is pointer to static data and shouldn't be freed
  87     bool            m_static;
  88
  89     // same as m_static but for m_alpha
  90     bool            m_staticAlpha;
  91
  92 #if wxUSE_PALETTE
  93     wxPalette       m_palette;
  94 #endif // wxUSE_PALETTE
  95
  96     wxArrayString   m_optionNames;
  97     wxArrayString   m_optionValues;
  98
  99     wxDECLARE_NO_COPY_CLASS(wxImageRefData);
 100 };
 101
 102 wxImageRefData::wxImageRefData()
 103 {
 104     m_width = 0;
 105     m_height = 0;
 106     m_type = wxBITMAP_TYPE_INVALID;
 107     m_data =
 108     m_alpha = (unsigned char *) NULL;
 109
 110     m_maskRed = 0;
 111     m_maskGreen = 0;
 112     m_maskBlue = 0;
 113     m_hasMask = false;
 114
 115     m_ok = false;
 116     m_static =
 117     m_staticAlpha = false;
 118 }
 119
 120 wxImageRefData::~wxImageRefData()
 121 {
 122     if ( !m_static )
 123         free( m_data );
 124     if ( !m_staticAlpha )
 125         free( m_alpha );
 126 }
 127
 128
 129 //-----------------------------------------------------------------------------
 130 // wxImage
 131 //-----------------------------------------------------------------------------
 132
 133 #define M_IMGDATA static_cast<wxImageRefData*>(m_refData)
 134
 135 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 136
 137 bool wxImage::Create(const char* const* xpmData)
 138 {
 139 #if wxUSE_XPM
 140     UnRef();
 141
 142     wxXPMDecoder decoder;
 143     (*this) = decoder.ReadData(xpmData);
 144     return Ok();
 145 #else
 146     return false;
 147 #endif
 148 }
 149
 150 bool wxImage::Create( int width, int height, bool clear )
 151 {
 152     UnRef();
 153
 154     m_refData = new wxImageRefData();
 155
 156     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 157     if (!M_IMGDATA->m_data)
 158     {
 159         UnRef();
 160         return false;
 161     }
 162
 163     M_IMGDATA->m_width = width;
 164     M_IMGDATA->m_height = height;
 165     M_IMGDATA->m_ok = true;
 166
 167     if (clear)
 168     {
 169         Clear();
 170     }
 171
 172     return true;
 173 }
 174
 175 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 176 {
 177     UnRef();
 178
 179     wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 180
 181     m_refData = new wxImageRefData();
 182
 183     M_IMGDATA->m_data = data;
 184     M_IMGDATA->m_width = width;
 185     M_IMGDATA->m_height = height;
 186     M_IMGDATA->m_ok = true;
 187     M_IMGDATA->m_static = static_data;
 188
 189     return true;
 190 }
 191
 192 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 193 {
 194     UnRef();
 195
 196     wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 197
 198     m_refData = new wxImageRefData();
 199
 200     M_IMGDATA->m_data = data;
 201     M_IMGDATA->m_alpha = alpha;
 202     M_IMGDATA->m_width = width;
 203     M_IMGDATA->m_height = height;
 204     M_IMGDATA->m_ok = true;
 205     M_IMGDATA->m_static = static_data;
 206     M_IMGDATA->m_staticAlpha = static_data;
 207
 208     return true;
 209 }
 210
 211 void wxImage::Destroy()
 212 {
 213     UnRef();
 214 }
 215
 216 void wxImage::Clear(unsigned char value)
 217 {
 218     memset(M_IMGDATA->m_data, value, M_IMGDATA->m_width*M_IMGDATA->m_height*3);
 219 }
 220
 221 wxObjectRefData* wxImage::CreateRefData() const
 222 {
 223     return new wxImageRefData;
 224 }
 225
 226 wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
 227 {
 228     const wxImageRefData* refData = static_cast<const wxImageRefData*>(that);
 229     wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
 230
 231     wxImageRefData* refData_new = new wxImageRefData;
 232     refData_new->m_width = refData->m_width;
 233     refData_new->m_height = refData->m_height;
 234     refData_new->m_maskRed = refData->m_maskRed;
 235     refData_new->m_maskGreen = refData->m_maskGreen;
 236     refData_new->m_maskBlue = refData->m_maskBlue;
 237     refData_new->m_hasMask = refData->m_hasMask;
 238     refData_new->m_ok = true;
 239     unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height);
 240     if (refData->m_alpha != NULL)
 241     {
 242         refData_new->m_alpha = (unsigned char*)malloc(size);
 243         memcpy(refData_new->m_alpha, refData->m_alpha, size);
 244     }
 245     size *= 3;
 246     refData_new->m_data = (unsigned char*)malloc(size);
 247     memcpy(refData_new->m_data, refData->m_data, size);
 248 #if wxUSE_PALETTE
 249     refData_new->m_palette = refData->m_palette;
 250 #endif
 251     refData_new->m_optionNames = refData->m_optionNames;
 252     refData_new->m_optionValues = refData->m_optionValues;
 253     return refData_new;
 254 }
 255
 256 wxImage wxImage::Copy() const
 257 {
 258     wxImage image;
 259
 260     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 261
 262     image.m_refData = CloneRefData(m_refData);
 263
 264     return image;
 265 }
 266
 267 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 268 {
 269     if( xFactor == 1 && yFactor == 1 )
 270         return *this;
 271
 272     wxImage image;
 273
 274     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 275
 276     // can't scale to/from 0 size
 277     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 278                  wxT("invalid new image size") );
 279
 280     long old_height = M_IMGDATA->m_height,
 281          old_width  = M_IMGDATA->m_width;
 282
 283     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 284                  wxT("invalid old image size") );
 285
 286     long width = old_width / xFactor ;
 287     long height = old_height / yFactor ;
 288
 289     image.Create( width, height, false );
 290
 291     char unsigned *data = image.GetData();
 292
 293     wxCHECK_MSG( data, image, wxT("unable to create image") );
 294
 295     bool hasMask = false ;
 296     unsigned char maskRed = 0;
 297     unsigned char maskGreen = 0;
 298     unsigned char maskBlue =0 ;
 299
 300     unsigned char *source_data = M_IMGDATA->m_data;
 301     unsigned char *target_data = data;
 302     unsigned char *source_alpha = 0 ;
 303     unsigned char *target_alpha = 0 ;
 304     if (M_IMGDATA->m_hasMask)
 305     {
 306         hasMask = true ;
 307         maskRed = M_IMGDATA->m_maskRed;
 308         maskGreen = M_IMGDATA->m_maskGreen;
 309         maskBlue =M_IMGDATA->m_maskBlue ;
 310
 311         image.SetMaskColour( M_IMGDATA->m_maskRed,
 312                              M_IMGDATA->m_maskGreen,
 313                              M_IMGDATA->m_maskBlue );
 314     }
 315     else
 316     {
 317         source_alpha = M_IMGDATA->m_alpha ;
 318         if ( source_alpha )
 319         {
 320             image.SetAlpha() ;
 321             target_alpha = image.GetAlpha() ;
 322         }
 323     }
 324
 325     for (long y = 0; y < height; y++)
 326     {
 327         for (long x = 0; x < width; x++)
 328         {
 329             unsigned long avgRed = 0 ;
 330             unsigned long avgGreen = 0;
 331             unsigned long avgBlue = 0;
 332             unsigned long avgAlpha = 0 ;
 333             unsigned long counter = 0 ;
 334             // determine average
 335             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 336             {
 337                 long y_offset = (y * yFactor + y1) * old_width;
 338                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 339                 {
 340                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 341                     unsigned char red = pixel[0] ;
 342                     unsigned char green = pixel[1] ;
 343                     unsigned char blue = pixel[2] ;
 344                     unsigned char alpha = 255  ;
 345                     if ( source_alpha )
 346                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 347                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 348                     {
 349                         if ( alpha > 0 )
 350                         {
 351                             avgRed += red ;
 352                             avgGreen += green ;
 353                             avgBlue += blue ;
 354                         }
 355                         avgAlpha += alpha ;
 356                         counter++ ;
 357                     }
 358                 }
 359             }
 360             if ( counter == 0 )
 361             {
 362                 *(target_data++) = M_IMGDATA->m_maskRed ;
 363                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 364                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 365             }
 366             else
 367             {
 368                 if ( source_alpha )
 369                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 370                 *(target_data++) = (unsigned char)(avgRed / counter);
 371                 *(target_data++) = (unsigned char)(avgGreen / counter);
 372                 *(target_data++) = (unsigned char)(avgBlue / counter);
 373             }
 374         }
 375     }
 376
 377     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 378     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 379         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 380                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 381     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 382         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 383                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 384
 385     return image;
 386 }
 387
 388 wxImage
 389 wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
 390 {
 391     wxImage image;
 392
 393     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 394
 395     // can't scale to/from 0 size
 396     wxCHECK_MSG( (width > 0) && (height > 0), image,
 397                  wxT("invalid new image size") );
 398
 399     long old_height = M_IMGDATA->m_height,
 400          old_width  = M_IMGDATA->m_width;
 401     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 402                  wxT("invalid old image size") );
 403
 404     // If the image's new width and height are the same as the original, no
 405     // need to waste time or CPU cycles
 406     if ( old_width == width && old_height == height )
 407         return *this;
 408
 409     // resample the image using either the nearest neighbourhood, bilinear or
 410     // bicubic method as specified
 411     switch ( quality )
 412     {
 413         case wxIMAGE_QUALITY_BICUBIC:
 414         case wxIMAGE_QUALITY_BILINEAR:
 415             // both of these algorithms should be used for up-sampling the
 416             // image only, when down-sampling always use box averaging for best
 417             // results
 418             if ( width < old_width && height < old_height )
 419                 image = ResampleBox(width, height);
 420             else if ( quality == wxIMAGE_QUALITY_BILINEAR )
 421                 image = ResampleBilinear(width, height);
 422             else if ( quality == wxIMAGE_QUALITY_BICUBIC )
 423                 image = ResampleBicubic(width, height);
 424             break;
 425
 426         case wxIMAGE_QUALITY_NEAREST:
 427             if ( old_width % width == 0 && old_width >= width &&
 428                 old_height % height == 0 && old_height >= height )
 429             {
 430                 return ShrinkBy( old_width / width , old_height / height );
 431             }
 432
 433             image = ResampleNearest(width, height);
 434             break;
 435     }
 436
 437     // If the original image has a mask, apply the mask to the new image
 438     if (M_IMGDATA->m_hasMask)
 439     {
 440         image.SetMaskColour( M_IMGDATA->m_maskRed,
 441                             M_IMGDATA->m_maskGreen,
 442                             M_IMGDATA->m_maskBlue );
 443     }
 444
 445     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 446     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 447         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 448                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 449     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 450         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 451                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 452
 453     return image;
 454 }
 455
 456 wxImage wxImage::ResampleNearest(int width, int height) const
 457 {
 458     wxImage image;
 459     image.Create( width, height, false );
 460
 461     unsigned char *data = image.GetData();
 462
 463     wxCHECK_MSG( data, image, wxT("unable to create image") );
 464
 465     unsigned char *source_data = M_IMGDATA->m_data;
 466     unsigned char *target_data = data;
 467     unsigned char *source_alpha = 0 ;
 468     unsigned char *target_alpha = 0 ;
 469
 470     if ( !M_IMGDATA->m_hasMask )
 471     {
 472         source_alpha = M_IMGDATA->m_alpha ;
 473         if ( source_alpha )
 474         {
 475             image.SetAlpha() ;
 476             target_alpha = image.GetAlpha() ;
 477         }
 478     }
 479
 480     long old_height = M_IMGDATA->m_height,
 481          old_width  = M_IMGDATA->m_width;
 482     long x_delta = (old_width<<16) / width;
 483     long y_delta = (old_height<<16) / height;
 484
 485     unsigned char* dest_pixel = target_data;
 486
 487     long y = 0;
 488     for ( long j = 0; j < height; j++ )
 489     {
 490         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 491         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 492
 493         long x = 0;
 494         for ( long i = 0; i < width; i++ )
 495         {
 496             unsigned char* src_pixel = &src_line[(x>>16)*3];
 497             unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 498             dest_pixel[0] = src_pixel[0];
 499             dest_pixel[1] = src_pixel[1];
 500             dest_pixel[2] = src_pixel[2];
 501             dest_pixel += 3;
 502             if ( source_alpha )
 503                 *(target_alpha++) = *src_alpha_pixel ;
 504             x += x_delta;
 505         }
 506
 507         y += y_delta;
 508     }
 509
 510     return image;
 511 }
 512
 513 wxImage wxImage::ResampleBox(int width, int height) const
 514 {
 515     // This function implements a simple pre-blur/box averaging method for
 516     // downsampling that gives reasonably smooth results To scale the image
 517     // down we will need to gather a grid of pixels of the size of the scale
 518     // factor in each direction and then do an averaging of the pixels.
 519
 520     wxImage ret_image(width, height, false);
 521
 522     const double scale_factor_x = double(M_IMGDATA->m_width) / width;
 523     const double scale_factor_y = double(M_IMGDATA->m_height) / height;
 524
 525     const int scale_factor_x_2 = (int)(scale_factor_x / 2);
 526     const int scale_factor_y_2 = (int)(scale_factor_y / 2);
 527
 528     unsigned char* src_data = M_IMGDATA->m_data;
 529     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 530     unsigned char* dst_data = ret_image.GetData();
 531     unsigned char* dst_alpha = NULL;
 532
 533     if ( src_alpha )
 534     {
 535         ret_image.SetAlpha();
 536         dst_alpha = ret_image.GetAlpha();
 537     }
 538
 539     int averaged_pixels, src_pixel_index;
 540     double sum_r, sum_g, sum_b, sum_a;
 541
 542     for ( int y = 0; y < height; y++ )         // Destination image - Y direction
 543     {
 544         // Source pixel in the Y direction
 545         int src_y = (int)(y * scale_factor_y);
 546
 547         for ( int x = 0; x < width; x++ )      // Destination image - X direction
 548         {
 549             // Source pixel in the X direction
 550             int src_x = (int)(x * scale_factor_x);
 551
 552             // Box of pixels to average
 553             averaged_pixels = 0;
 554             sum_r = sum_g = sum_b = sum_a = 0.0;
 555
 556             for ( int j = int(src_y - scale_factor_y/2.0 + 1);
 557                   j <= int(src_y + scale_factor_y_2);
 558                   j++ )
 559             {
 560                 // We don't care to average pixels that don't exist (edges)
 561                 if ( j < 0 || j > M_IMGDATA->m_height - 1 )
 562                     continue;
 563
 564                 for ( int i = int(src_x - scale_factor_x/2.0 + 1);
 565                       i <= src_x + scale_factor_x_2;
 566                       i++ )
 567                 {
 568                     // Don't average edge pixels
 569                     if ( i < 0 || i > M_IMGDATA->m_width - 1 )
 570                         continue;
 571
 572                     // Calculate the actual index in our source pixels
 573                     src_pixel_index = j * M_IMGDATA->m_width + i;
 574
 575                     sum_r += src_data[src_pixel_index * 3 + 0];
 576                     sum_g += src_data[src_pixel_index * 3 + 1];
 577                     sum_b += src_data[src_pixel_index * 3 + 2];
 578                     if ( src_alpha )
 579                         sum_a += src_alpha[src_pixel_index];
 580
 581                     averaged_pixels++;
 582                 }
 583             }
 584
 585             // Calculate the average from the sum and number of averaged pixels
 586             dst_data[0] = (unsigned char)(sum_r / averaged_pixels);
 587             dst_data[1] = (unsigned char)(sum_g / averaged_pixels);
 588             dst_data[2] = (unsigned char)(sum_b / averaged_pixels);
 589             dst_data += 3;
 590             if ( src_alpha )
 591                 *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels);
 592         }
 593     }
 594
 595     return ret_image;
 596 }
 597
 598 wxImage wxImage::ResampleBilinear(int width, int height) const
 599 {
 600     // This function implements a Bilinear algorithm for resampling.
 601     wxImage ret_image(width, height, false);
 602     unsigned char* src_data = M_IMGDATA->m_data;
 603     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 604     unsigned char* dst_data = ret_image.GetData();
 605     unsigned char* dst_alpha = NULL;
 606
 607     if ( src_alpha )
 608     {
 609         ret_image.SetAlpha();
 610         dst_alpha = ret_image.GetAlpha();
 611     }
 612     double HFactor = double(M_IMGDATA->m_height) / height;
 613     double WFactor = double(M_IMGDATA->m_width) / width;
 614
 615     int srcpixymax = M_IMGDATA->m_height - 1;
 616     int srcpixxmax = M_IMGDATA->m_width - 1;
 617
 618     double srcpixy, srcpixy1, srcpixy2, dy, dy1;
 619     double srcpixx, srcpixx1, srcpixx2, dx, dx1;
 620
 621     // initialize alpha values to avoid g++ warnings about possibly
 622     // uninitialized variables
 623     double r1, g1, b1, a1 = 0;
 624     double r2, g2, b2, a2 = 0;
 625
 626     for ( int dsty = 0; dsty < height; dsty++ )
 627     {
 628         // We need to calculate the source pixel to interpolate from - Y-axis
 629         srcpixy = double(dsty) * HFactor;
 630         srcpixy1 = int(srcpixy);
 631         srcpixy2 = ( srcpixy1 == srcpixymax ) ? srcpixy1 : srcpixy1 + 1.0;
 632         dy = srcpixy - (int)srcpixy;
 633         dy1 = 1.0 - dy;
 634
 635
 636         for ( int dstx = 0; dstx < width; dstx++ )
 637         {
 638             // X-axis of pixel to interpolate from
 639             srcpixx = double(dstx) * WFactor;
 640             srcpixx1 = int(srcpixx);
 641             srcpixx2 = ( srcpixx1 == srcpixxmax ) ? srcpixx1 : srcpixx1 + 1.0;
 642             dx = srcpixx - (int)srcpixx;
 643             dx1 = 1.0 - dx;
 644
 645             int x_offset1 = srcpixx1 < 0.0 ? 0 : srcpixx1 > srcpixxmax ? srcpixxmax : (int)srcpixx1;
 646             int x_offset2 = srcpixx2 < 0.0 ? 0 : srcpixx2 > srcpixxmax ? srcpixxmax : (int)srcpixx2;
 647             int y_offset1 = srcpixy1 < 0.0 ? 0 : srcpixy1 > srcpixymax ? srcpixymax : (int)srcpixy1;
 648             int y_offset2 = srcpixy2 < 0.0 ? 0 : srcpixy2 > srcpixymax ? srcpixymax : (int)srcpixy2;
 649
 650             int src_pixel_index00 = y_offset1 * M_IMGDATA->m_width + x_offset1;
 651             int src_pixel_index01 = y_offset1 * M_IMGDATA->m_width + x_offset2;
 652             int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1;
 653             int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2;
 654
 655             //first line
 656             r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx;
 657             g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx;
 658             b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx;
 659             if ( src_alpha )
 660                 a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx;
 661
 662             //second line
 663             r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx;
 664             g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx;
 665             b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx;
 666             if ( src_alpha )
 667                 a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx;
 668
 669             //result lines
 670
 671             dst_data[0] = static_cast<unsigned char>(r1 * dy1 + r2 * dy);
 672             dst_data[1] = static_cast<unsigned char>(g1 * dy1 + g2 * dy);
 673             dst_data[2] = static_cast<unsigned char>(b1 * dy1 + b2 * dy);
 674             dst_data += 3;
 675
 676             if ( src_alpha )
 677                 *dst_alpha++ = static_cast<unsigned char>(a1 * dy1 + a2 * dy);
 678         }
 679     }
 680
 681     return ret_image;
 682 }
 683
 684 // The following two local functions are for the B-spline weighting of the
 685 // bicubic sampling algorithm
 686 static inline double spline_cube(double value)
 687 {
 688     return value <= 0.0 ? 0.0 : value * value * value;
 689 }
 690
 691 static inline double spline_weight(double value)
 692 {
 693     return (spline_cube(value + 2) -
 694             4 * spline_cube(value + 1) +
 695             6 * spline_cube(value) -
 696             4 * spline_cube(value - 1)) / 6;
 697 }
 698
 699 // This is the bicubic resampling algorithm
 700 wxImage wxImage::ResampleBicubic(int width, int height) const
 701 {
 702     // This function implements a Bicubic B-Spline algorithm for resampling.
 703     // This method is certainly a little slower than wxImage's default pixel
 704     // replication method, however for most reasonably sized images not being
 705     // upsampled too much on a fairly average CPU this difference is hardly
 706     // noticeable and the results are far more pleasing to look at.
 707     //
 708     // This particular bicubic algorithm does pixel weighting according to a
 709     // B-Spline that basically implements a Gaussian bell-like weighting
 710     // kernel. Because of this method the results may appear a bit blurry when
 711     // upsampling by large factors.  This is basically because a slight
 712     // gaussian blur is being performed to get the smooth look of the upsampled
 713     // image.
 714
 715     // Edge pixels: 3-4 possible solutions
 716     // - (Wrap/tile) Wrap the image, take the color value from the opposite
 717     // side of the image.
 718     // - (Mirror)    Duplicate edge pixels, so that pixel at coordinate (2, n),
 719     // where n is nonpositive, will have the value of (2, 1).
 720     // - (Ignore)    Simply ignore the edge pixels and apply the kernel only to
 721     // pixels which do have all neighbours.
 722     // - (Clamp)     Choose the nearest pixel along the border. This takes the
 723     // border pixels and extends them out to infinity.
 724     //
 725     // NOTE: below the y_offset and x_offset variables are being set for edge
 726     // pixels using the "Mirror" method mentioned above
 727
 728     wxImage ret_image;
 729
 730     ret_image.Create(width, height, false);
 731
 732     unsigned char* src_data = M_IMGDATA->m_data;
 733     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 734     unsigned char* dst_data = ret_image.GetData();
 735     unsigned char* dst_alpha = NULL;
 736
 737     if ( src_alpha )
 738     {
 739         ret_image.SetAlpha();
 740         dst_alpha = ret_image.GetAlpha();
 741     }
 742
 743     for ( int dsty = 0; dsty < height; dsty++ )
 744     {
 745         // We need to calculate the source pixel to interpolate from - Y-axis
 746         double srcpixy = double(dsty * M_IMGDATA->m_height) / height;
 747         double dy = srcpixy - (int)srcpixy;
 748
 749         for ( int dstx = 0; dstx < width; dstx++ )
 750         {
 751             // X-axis of pixel to interpolate from
 752             double srcpixx = double(dstx * M_IMGDATA->m_width) / width;
 753             double dx = srcpixx - (int)srcpixx;
 754
 755             // Sums for each color channel
 756             double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0;
 757
 758             // Here we actually determine the RGBA values for the destination pixel
 759             for ( int k = -1; k <= 2; k++ )
 760             {
 761                 // Y offset
 762                 int y_offset = srcpixy + k < 0.0
 763                                 ? 0
 764                                 : srcpixy + k >= M_IMGDATA->m_height
 765                                        ? M_IMGDATA->m_height - 1
 766                                        : (int)(srcpixy + k);
 767
 768                 // Loop across the X axis
 769                 for ( int i = -1; i <= 2; i++ )
 770                 {
 771                     // X offset
 772                     int x_offset = srcpixx + i < 0.0
 773                                     ? 0
 774                                     : srcpixx + i >= M_IMGDATA->m_width
 775                                             ? M_IMGDATA->m_width - 1
 776                                             : (int)(srcpixx + i);
 777
 778                     // Calculate the exact position where the source data
 779                     // should be pulled from based on the x_offset and y_offset
 780                     int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset;
 781
 782                     // Calculate the weight for the specified pixel according
 783                     // to the bicubic b-spline kernel we're using for
 784                     // interpolation
 785                     double
 786                         pixel_weight = spline_weight(i - dx)*spline_weight(k - dy);
 787
 788                     // Create a sum of all velues for each color channel
 789                     // adjusted for the pixel's calculated weight
 790                     sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight;
 791                     sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight;
 792                     sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight;
 793                     if ( src_alpha )
 794                         sum_a += src_alpha[src_pixel_index] * pixel_weight;
 795                 }
 796             }
 797
 798             // Put the data into the destination image.  The summed values are
 799             // of double data type and are rounded here for accuracy
 800             dst_data[0] = (unsigned char)(sum_r + 0.5);
 801             dst_data[1] = (unsigned char)(sum_g + 0.5);
 802             dst_data[2] = (unsigned char)(sum_b + 0.5);
 803             dst_data += 3;
 804
 805             if ( src_alpha )
 806                 *dst_alpha++ = (unsigned char)sum_a;
 807         }
 808     }
 809
 810     return ret_image;
 811 }
 812
 813 // Blur in the horizontal direction
 814 wxImage wxImage::BlurHorizontal(int blurRadius) const
 815 {
 816     wxImage ret_image;
 817     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 818
 819     unsigned char* src_data = M_IMGDATA->m_data;
 820     unsigned char* dst_data = ret_image.GetData();
 821     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 822     unsigned char* dst_alpha = NULL;
 823
 824     // Check for a mask or alpha
 825     if ( src_alpha )
 826     {
 827         ret_image.SetAlpha();
 828         dst_alpha = ret_image.GetAlpha();
 829     }
 830     else if ( M_IMGDATA->m_hasMask )
 831     {
 832         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 833                                 M_IMGDATA->m_maskGreen,
 834                                 M_IMGDATA->m_maskBlue);
 835     }
 836
 837     // number of pixels we average over
 838     const int blurArea = blurRadius*2 + 1;
 839
 840     // Horizontal blurring algorithm - average all pixels in the specified blur
 841     // radius in the X or horizontal direction
 842     for ( int y = 0; y < M_IMGDATA->m_height; y++ )
 843     {
 844         // Variables used in the blurring algorithm
 845         long sum_r = 0,
 846              sum_g = 0,
 847              sum_b = 0,
 848              sum_a = 0;
 849
 850         long pixel_idx;
 851         const unsigned char *src;
 852         unsigned char *dst;
 853
 854         // Calculate the average of all pixels in the blur radius for the first
 855         // pixel of the row
 856         for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ )
 857         {
 858             // To deal with the pixels at the start of a row so it's not
 859             // grabbing GOK values from memory at negative indices of the
 860             // image's data or grabbing from the previous row
 861             if ( kernel_x < 0 )
 862                 pixel_idx = y * M_IMGDATA->m_width;
 863             else
 864                 pixel_idx = kernel_x + y * M_IMGDATA->m_width;
 865
 866             src = src_data + pixel_idx*3;
 867             sum_r += src[0];
 868             sum_g += src[1];
 869             sum_b += src[2];
 870             if ( src_alpha )
 871                 sum_a += src_alpha[pixel_idx];
 872         }
 873
 874         dst = dst_data + y * M_IMGDATA->m_width*3;
 875         dst[0] = (unsigned char)(sum_r / blurArea);
 876         dst[1] = (unsigned char)(sum_g / blurArea);
 877         dst[2] = (unsigned char)(sum_b / blurArea);
 878         if ( src_alpha )
 879             dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 880
 881         // Now average the values of the rest of the pixels by just moving the
 882         // blur radius box along the row
 883         for ( int x = 1; x < M_IMGDATA->m_width; x++ )
 884         {
 885             // Take care of edge pixels on the left edge by essentially
 886             // duplicating the edge pixel
 887             if ( x - blurRadius - 1 < 0 )
 888                 pixel_idx = y * M_IMGDATA->m_width;
 889             else
 890                 pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width;
 891
 892             // Subtract the value of the pixel at the left side of the blur
 893             // radius box
 894             src = src_data + pixel_idx*3;
 895             sum_r -= src[0];
 896             sum_g -= src[1];
 897             sum_b -= src[2];
 898             if ( src_alpha )
 899                 sum_a -= src_alpha[pixel_idx];
 900
 901             // Take care of edge pixels on the right edge
 902             if ( x + blurRadius > M_IMGDATA->m_width - 1 )
 903                 pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width;
 904             else
 905                 pixel_idx = x + blurRadius + y * M_IMGDATA->m_width;
 906
 907             // Add the value of the pixel being added to the end of our box
 908             src = src_data + pixel_idx*3;
 909             sum_r += src[0];
 910             sum_g += src[1];
 911             sum_b += src[2];
 912             if ( src_alpha )
 913                 sum_a += src_alpha[pixel_idx];
 914
 915             // Save off the averaged data
 916             dst = dst_data + x*3 + y*M_IMGDATA->m_width*3;
 917             dst[0] = (unsigned char)(sum_r / blurArea);
 918             dst[1] = (unsigned char)(sum_g / blurArea);
 919             dst[2] = (unsigned char)(sum_b / blurArea);
 920             if ( src_alpha )
 921                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 922         }
 923     }
 924
 925     return ret_image;
 926 }
 927
 928 // Blur in the vertical direction
 929 wxImage wxImage::BlurVertical(int blurRadius) const
 930 {
 931     wxImage ret_image;
 932     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 933
 934     unsigned char* src_data = M_IMGDATA->m_data;
 935     unsigned char* dst_data = ret_image.GetData();
 936     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 937     unsigned char* dst_alpha = NULL;
 938
 939     // Check for a mask or alpha
 940     if ( src_alpha )
 941     {
 942         ret_image.SetAlpha();
 943         dst_alpha = ret_image.GetAlpha();
 944     }
 945     else if ( M_IMGDATA->m_hasMask )
 946     {
 947         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 948                                 M_IMGDATA->m_maskGreen,
 949                                 M_IMGDATA->m_maskBlue);
 950     }
 951
 952     // number of pixels we average over
 953     const int blurArea = blurRadius*2 + 1;
 954
 955     // Vertical blurring algorithm - same as horizontal but switched the
 956     // opposite direction
 957     for ( int x = 0; x < M_IMGDATA->m_width; x++ )
 958     {
 959         // Variables used in the blurring algorithm
 960         long sum_r = 0,
 961              sum_g = 0,
 962              sum_b = 0,
 963              sum_a = 0;
 964
 965         long pixel_idx;
 966         const unsigned char *src;
 967         unsigned char *dst;
 968
 969         // Calculate the average of all pixels in our blur radius box for the
 970         // first pixel of the column
 971         for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ )
 972         {
 973             // To deal with the pixels at the start of a column so it's not
 974             // grabbing GOK values from memory at negative indices of the
 975             // image's data or grabbing from the previous column
 976             if ( kernel_y < 0 )
 977                 pixel_idx = x;
 978             else
 979                 pixel_idx = x + kernel_y * M_IMGDATA->m_width;
 980
 981             src = src_data + pixel_idx*3;
 982             sum_r += src[0];
 983             sum_g += src[1];
 984             sum_b += src[2];
 985             if ( src_alpha )
 986                 sum_a += src_alpha[pixel_idx];
 987         }
 988
 989         dst = dst_data + x*3;
 990         dst[0] = (unsigned char)(sum_r / blurArea);
 991         dst[1] = (unsigned char)(sum_g / blurArea);
 992         dst[2] = (unsigned char)(sum_b / blurArea);
 993         if ( src_alpha )
 994             dst_alpha[x] = (unsigned char)(sum_a / blurArea);
 995
 996         // Now average the values of the rest of the pixels by just moving the
 997         // box along the column from top to bottom
 998         for ( int y = 1; y < M_IMGDATA->m_height; y++ )
 999         {
1000             // Take care of pixels that would be beyond the top edge by
1001             // duplicating the top edge pixel for the column
1002             if ( y - blurRadius - 1 < 0 )
1003                 pixel_idx = x;
1004             else
1005                 pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width;
1006
1007             // Subtract the value of the pixel at the top of our blur radius box
1008             src = src_data + pixel_idx*3;
1009             sum_r -= src[0];
1010             sum_g -= src[1];
1011             sum_b -= src[2];
1012             if ( src_alpha )
1013                 sum_a -= src_alpha[pixel_idx];
1014
1015             // Take care of the pixels that would be beyond the bottom edge of
1016             // the image similar to the top edge
1017             if ( y + blurRadius > M_IMGDATA->m_height - 1 )
1018                 pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width;
1019             else
1020                 pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width;
1021
1022             // Add the value of the pixel being added to the end of our box
1023             src = src_data + pixel_idx*3;
1024             sum_r += src[0];
1025             sum_g += src[1];
1026             sum_b += src[2];
1027             if ( src_alpha )
1028                 sum_a += src_alpha[pixel_idx];
1029
1030             // Save off the averaged data
1031             dst = dst_data + (x + y * M_IMGDATA->m_width) * 3;
1032             dst[0] = (unsigned char)(sum_r / blurArea);
1033             dst[1] = (unsigned char)(sum_g / blurArea);
1034             dst[2] = (unsigned char)(sum_b / blurArea);
1035             if ( src_alpha )
1036                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
1037         }
1038     }
1039
1040     return ret_image;
1041 }
1042
1043 // The new blur function
1044 wxImage wxImage::Blur(int blurRadius) const
1045 {
1046     wxImage ret_image;
1047     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1048
1049     // Blur the image in each direction
1050     ret_image = BlurHorizontal(blurRadius);
1051     ret_image = ret_image.BlurVertical(blurRadius);
1052
1053     return ret_image;
1054 }
1055
1056 wxImage wxImage::Rotate90( bool clockwise ) const
1057 {
1058     wxImage image;
1059
1060     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1061
1062     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
1063
1064     unsigned char *data = image.GetData();
1065
1066     wxCHECK_MSG( data, image, wxT("unable to create image") );
1067
1068     unsigned char *source_data = M_IMGDATA->m_data;
1069     unsigned char *target_data;
1070     unsigned char *alpha_data = 0 ;
1071     unsigned char *source_alpha = M_IMGDATA->m_alpha;
1072     unsigned char *target_alpha = 0 ;
1073
1074     if ( source_alpha )
1075     {
1076         image.SetAlpha();
1077         alpha_data = image.GetAlpha();
1078         wxCHECK_MSG( alpha_data, image, wxS("unable to create alpha channel") );
1079     }
1080
1081     if ( M_IMGDATA->m_hasMask )
1082         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1083
1084     long height = M_IMGDATA->m_height;
1085     long width  = M_IMGDATA->m_width;
1086
1087     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
1088     {
1089         int hot_x = GetOptionInt( wxIMAGE_OPTION_CUR_HOTSPOT_X );
1090         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
1091                         clockwise ? hot_x : width - 1 - hot_x);
1092     }
1093
1094     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
1095     {
1096         int hot_y = GetOptionInt( wxIMAGE_OPTION_CUR_HOTSPOT_Y );
1097         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
1098                         clockwise ? height - 1 - hot_y : hot_y);
1099     }
1100
1101     for (long j = 0; j < height; j++)
1102     {
1103         for (long i = 0; i < width; i++)
1104         {
1105             if (clockwise)
1106             {
1107                 target_data = data + (((i+1)*height) - j - 1)*3;
1108                 if(source_alpha)
1109                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
1110             }
1111             else
1112             {
1113                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
1114                 if(source_alpha)
1115                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
1116             }
1117             memcpy( target_data, source_data, 3 );
1118             source_data += 3;
1119
1120             if(source_alpha)
1121             {
1122                 memcpy( target_alpha, source_alpha, 1 );
1123                 source_alpha += 1;
1124             }
1125         }
1126     }
1127
1128     return image;
1129 }
1130
1131 wxImage wxImage::Rotate180() const
1132 {
1133     wxImage image;
1134
1135     wxCHECK_MSG( Ok(), image, wxS("invalid image") );
1136
1137     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1138
1139     unsigned char *data = image.GetData();
1140     unsigned char *alpha = NULL;
1141
1142     wxCHECK_MSG( data, image, wxS("unable to create image") );
1143
1144     if ( M_IMGDATA->m_alpha != NULL )
1145     {
1146         image.SetAlpha();
1147         alpha = image.GetAlpha();
1148         wxCHECK_MSG( alpha, image, wxS("unable to create alpha channel") );
1149     }
1150
1151     if ( M_IMGDATA->m_hasMask )
1152         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1153
1154     long height = M_IMGDATA->m_height;
1155     long width  = M_IMGDATA->m_width;
1156
1157     const unsigned char *source_data = M_IMGDATA->m_data;
1158     unsigned char *target_data = data + width * height * 3;
1159
1160     for (long j = 0; j < height; j++)
1161     {
1162         for (long i = 0; i < width; i++)
1163         {
1164             target_data -= 3;
1165             memcpy( target_data, source_data, 3 );
1166             source_data += 3;
1167         }
1168     }
1169
1170     if ( alpha )
1171     {
1172         const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1173         unsigned char *dest_alpha = alpha + width * height;
1174
1175         for (long j = 0; j < height; ++j)
1176         {
1177             for (long i = 0; i < width; ++i)
1178             {
1179                 *(--dest_alpha) = *(src_alpha++);
1180             }
1181         }
1182     }
1183
1184     return image;
1185 }
1186
1187 wxImage wxImage::Mirror( bool horizontally ) const
1188 {
1189     wxImage image;
1190
1191     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1192
1193     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1194
1195     unsigned char *data = image.GetData();
1196     unsigned char *alpha = NULL;
1197
1198     wxCHECK_MSG( data, image, wxT("unable to create image") );
1199
1200     if (M_IMGDATA->m_alpha != NULL) {
1201         image.SetAlpha();
1202         alpha = image.GetAlpha();
1203         wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
1204     }
1205
1206     if (M_IMGDATA->m_hasMask)
1207         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1208
1209     long height = M_IMGDATA->m_height;
1210     long width  = M_IMGDATA->m_width;
1211
1212     unsigned char *source_data = M_IMGDATA->m_data;
1213     unsigned char *target_data;
1214
1215     if (horizontally)
1216     {
1217         for (long j = 0; j < height; j++)
1218         {
1219             data += width*3;
1220             target_data = data-3;
1221             for (long i = 0; i < width; i++)
1222             {
1223                 memcpy( target_data, source_data, 3 );
1224                 source_data += 3;
1225                 target_data -= 3;
1226             }
1227         }
1228
1229         if (alpha != NULL)
1230         {
1231             // src_alpha starts at the first pixel and increases by 1 after each step
1232             // (a step here is the copy of the alpha value of one pixel)
1233             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1234             // dest_alpha starts just beyond the first line, decreases before each step,
1235             // and after each line is finished, increases by 2 widths (skipping the line
1236             // just copied and the line that will be copied next)
1237             unsigned char *dest_alpha = alpha + width;
1238
1239             for (long jj = 0; jj < height; ++jj)
1240             {
1241                 for (long i = 0; i < width; ++i) {
1242                     *(--dest_alpha) = *(src_alpha++); // copy one pixel
1243                 }
1244                 dest_alpha += 2 * width; // advance beyond the end of the next line
1245             }
1246         }
1247     }
1248     else
1249     {
1250         for (long i = 0; i < height; i++)
1251         {
1252             target_data = data + 3*width*(height-1-i);
1253             memcpy( target_data, source_data, (size_t)3*width );
1254             source_data += 3*width;
1255         }
1256
1257         if (alpha != NULL)
1258         {
1259             // src_alpha starts at the first pixel and increases by 1 width after each step
1260             // (a step here is the copy of the alpha channel of an entire line)
1261             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1262             // dest_alpha starts just beyond the last line (beyond the whole image)
1263             // and decreases by 1 width before each step
1264             unsigned char *dest_alpha = alpha + width * height;
1265
1266             for (long jj = 0; jj < height; ++jj)
1267             {
1268                 dest_alpha -= width;
1269                 memcpy( dest_alpha, src_alpha, (size_t)width );
1270                 src_alpha += width;
1271             }
1272         }
1273     }
1274
1275     return image;
1276 }
1277
1278 wxImage wxImage::GetSubImage( const wxRect &rect ) const
1279 {
1280     wxImage image;
1281
1282     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1283
1284     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
1285                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
1286                  image, wxT("invalid subimage size") );
1287
1288     const int subwidth = rect.GetWidth();
1289     const int subheight = rect.GetHeight();
1290
1291     image.Create( subwidth, subheight, false );
1292
1293     const unsigned char *src_data = GetData();
1294     const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1295     unsigned char *subdata = image.GetData();
1296     unsigned char *subalpha = NULL;
1297
1298     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
1299
1300     if (src_alpha != NULL) {
1301         image.SetAlpha();
1302         subalpha = image.GetAlpha();
1303         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
1304     }
1305
1306     if (M_IMGDATA->m_hasMask)
1307         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1308
1309     const int width = GetWidth();
1310     const int pixsoff = rect.GetLeft() + width * rect.GetTop();
1311
1312     src_data += 3 * pixsoff;
1313     src_alpha += pixsoff; // won't be used if was NULL, so this is ok
1314
1315     for (long j = 0; j < subheight; ++j)
1316     {
1317         memcpy( subdata, src_data, 3 * subwidth );
1318         subdata += 3 * subwidth;
1319         src_data += 3 * width;
1320         if (subalpha != NULL) {
1321             memcpy( subalpha, src_alpha, subwidth );
1322             subalpha += subwidth;
1323             src_alpha += width;
1324         }
1325     }
1326
1327     return image;
1328 }
1329
1330 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
1331                        int r_, int g_, int b_ ) const
1332 {
1333     wxImage image;
1334
1335     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1336     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
1337
1338     int width = GetWidth(), height = GetHeight();
1339     image.Create(size.GetWidth(), size.GetHeight(), false);
1340
1341     unsigned char r = (unsigned char)r_;
1342     unsigned char g = (unsigned char)g_;
1343     unsigned char b = (unsigned char)b_;
1344     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
1345     {
1346         GetOrFindMaskColour( &r, &g, &b );
1347         image.SetMaskColour(r, g, b);
1348     }
1349
1350     image.SetRGB(wxRect(), r, g, b);
1351
1352     // we have two coordinate systems:
1353     // source:     starting at 0,0 of source image
1354     // destination starting at 0,0 of destination image
1355     // Documentation says:
1356     // "The image is pasted into a new image [...] at the position pos relative
1357     // to the upper left of the new image." this means the transition rule is:
1358     // "dest coord" = "source coord" + pos;
1359
1360     // calculate the intersection using source coordinates:
1361     wxRect srcRect(0, 0, width, height);
1362     wxRect dstRect(-pos, size);
1363
1364     srcRect.Intersect(dstRect);
1365
1366     if (!srcRect.IsEmpty())
1367     {
1368         // insertion point is needed in destination coordinates.
1369         // NB: it is not always "pos"!
1370         wxPoint ptInsert = srcRect.GetTopLeft() + pos;
1371
1372         if ((srcRect.GetWidth() == width) && (srcRect.GetHeight() == height))
1373             image.Paste(*this, ptInsert.x, ptInsert.y);
1374         else
1375             image.Paste(GetSubImage(srcRect), ptInsert.x, ptInsert.y);
1376     }
1377
1378     return image;
1379 }
1380
1381 void wxImage::Paste( const wxImage &image, int x, int y )
1382 {
1383     wxCHECK_RET( Ok(), wxT("invalid image") );
1384     wxCHECK_RET( image.Ok(), wxT("invalid image") );
1385
1386     AllocExclusive();
1387
1388     int xx = 0;
1389     int yy = 0;
1390     int width = image.GetWidth();
1391     int height = image.GetHeight();
1392
1393     if (x < 0)
1394     {
1395         xx = -x;
1396         width += x;
1397     }
1398     if (y < 0)
1399     {
1400         yy = -y;
1401         height += y;
1402     }
1403
1404     if ((x+xx)+width > M_IMGDATA->m_width)
1405         width = M_IMGDATA->m_width - (x+xx);
1406     if ((y+yy)+height > M_IMGDATA->m_height)
1407         height = M_IMGDATA->m_height - (y+yy);
1408
1409     if (width < 1) return;
1410     if (height < 1) return;
1411
1412     if ((!HasMask() && !image.HasMask()) ||
1413         (HasMask() && !image.HasMask()) ||
1414        ((HasMask() && image.HasMask() &&
1415          (GetMaskRed()==image.GetMaskRed()) &&
1416          (GetMaskGreen()==image.GetMaskGreen()) &&
1417          (GetMaskBlue()==image.GetMaskBlue()))))
1418     {
1419         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1420         int source_step = image.GetWidth()*3;
1421
1422         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1423         int target_step = M_IMGDATA->m_width*3;
1424         for (int j = 0; j < height; j++)
1425         {
1426             memcpy( target_data, source_data, width*3 );
1427             source_data += source_step;
1428             target_data += target_step;
1429         }
1430     }
1431
1432     // Copy over the alpha channel from the original image
1433     if ( image.HasAlpha() )
1434     {
1435         if ( !HasAlpha() )
1436             InitAlpha();
1437
1438         unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
1439         int source_step = image.GetWidth();
1440
1441         unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
1442         int target_step = M_IMGDATA->m_width;
1443
1444         for (int j = 0; j < height; j++,
1445                                     source_data += source_step,
1446                                     target_data += target_step)
1447         {
1448             memcpy( target_data, source_data, width );
1449         }
1450     }
1451
1452     if (!HasMask() && image.HasMask())
1453     {
1454         unsigned char r = image.GetMaskRed();
1455         unsigned char g = image.GetMaskGreen();
1456         unsigned char b = image.GetMaskBlue();
1457
1458         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1459         int source_step = image.GetWidth()*3;
1460
1461         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1462         int target_step = M_IMGDATA->m_width*3;
1463
1464         for (int j = 0; j < height; j++)
1465         {
1466             for (int i = 0; i < width*3; i+=3)
1467             {
1468                 if ((source_data[i]   != r) ||
1469                     (source_data[i+1] != g) ||
1470                     (source_data[i+2] != b))
1471                 {
1472                     memcpy( target_data+i, source_data+i, 3 );
1473                 }
1474             }
1475             source_data += source_step;
1476             target_data += target_step;
1477         }
1478     }
1479 }
1480
1481 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
1482                        unsigned char r2, unsigned char g2, unsigned char b2 )
1483 {
1484     wxCHECK_RET( Ok(), wxT("invalid image") );
1485
1486     AllocExclusive();
1487
1488     unsigned char *data = GetData();
1489
1490     const int w = GetWidth();
1491     const int h = GetHeight();
1492
1493     for (int j = 0; j < h; j++)
1494         for (int i = 0; i < w; i++)
1495         {
1496             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
1497             {
1498                 data[0] = r2;
1499                 data[1] = g2;
1500                 data[2] = b2;
1501             }
1502             data += 3;
1503         }
1504 }
1505
1506 wxImage wxImage::ConvertToGreyscale(void) const
1507 {
1508     return ConvertToGreyscale(0.299, 0.587, 0.114);
1509 }
1510
1511 wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const
1512 {
1513     wxImage image;
1514
1515     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1516
1517     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1518
1519     unsigned char *dest = image.GetData();
1520
1521     wxCHECK_MSG( dest, image, wxT("unable to create image") );
1522
1523     unsigned char *src = M_IMGDATA->m_data;
1524     bool hasMask = M_IMGDATA->m_hasMask;
1525     unsigned char maskRed = M_IMGDATA->m_maskRed;
1526     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
1527     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
1528
1529     if ( hasMask )
1530         image.SetMaskColour(maskRed, maskGreen, maskBlue);
1531
1532     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
1533     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
1534     {
1535         memcpy(dest, src, 3);
1536         // don't modify the mask
1537         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
1538         {
1539         }
1540         else
1541         {
1542             wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b);
1543         }
1544     }
1545
1546     // copy the alpha channel, if any
1547     if (HasAlpha())
1548     {
1549         const size_t alphaSize = GetWidth() * GetHeight();
1550         unsigned char *alpha = (unsigned char*)malloc(alphaSize);
1551         memcpy(alpha, GetAlpha(), alphaSize);
1552         image.InitAlpha();
1553         image.SetAlpha(alpha);
1554     }
1555
1556     return image;
1557 }
1558
1559 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
1560 {
1561     wxImage image;
1562
1563     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1564
1565     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1566
1567     unsigned char *data = image.GetData();
1568
1569     wxCHECK_MSG( data, image, wxT("unable to create image") );
1570
1571     if (M_IMGDATA->m_hasMask)
1572     {
1573         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
1574                                          M_IMGDATA->m_maskBlue == b)
1575             image.SetMaskColour( 255, 255, 255 );
1576         else
1577             image.SetMaskColour( 0, 0, 0 );
1578     }
1579
1580     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
1581
1582     unsigned char *srcd = M_IMGDATA->m_data;
1583     unsigned char *tard = image.GetData();
1584
1585     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
1586     {
1587         bool on = (srcd[0] == r) && (srcd[1] == g) && (srcd[2] == b);
1588         wxColourBase::MakeMono(tard + 0, tard + 1, tard + 2, on);
1589     }
1590
1591     return image;
1592 }
1593
1594 wxImage wxImage::ConvertToDisabled(unsigned char brightness) const
1595 {
1596     wxImage image = *this;
1597
1598     unsigned char mr = image.GetMaskRed();
1599     unsigned char mg = image.GetMaskGreen();
1600     unsigned char mb = image.GetMaskBlue();
1601
1602     int width = image.GetWidth();
1603     int height = image.GetHeight();
1604     bool has_mask = image.HasMask();
1605
1606     for (int y = height-1; y >= 0; --y)
1607     {
1608         for (int x = width-1; x >= 0; --x)
1609         {
1610             unsigned char* data = image.GetData() + (y*(width*3))+(x*3);
1611             unsigned char* r = data;
1612             unsigned char* g = data+1;
1613             unsigned char* b = data+2;
1614
1615             if (has_mask && (*r == mr) && (*g == mg) && (*b == mb))
1616                 continue;
1617
1618             wxColour::MakeDisabled(r, g, b, brightness);
1619         }
1620     }
1621     return image;
1622 }
1623
1624 int wxImage::GetWidth() const
1625 {
1626     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1627
1628     return M_IMGDATA->m_width;
1629 }
1630
1631 int wxImage::GetHeight() const
1632 {
1633     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1634
1635     return M_IMGDATA->m_height;
1636 }
1637
1638 wxBitmapType wxImage::GetType() const
1639 {
1640     wxCHECK_MSG( IsOk(), wxBITMAP_TYPE_INVALID, wxT("invalid image") );
1641
1642     return M_IMGDATA->m_type;
1643 }
1644
1645 void wxImage::SetType(wxBitmapType type)
1646 {
1647     wxCHECK_RET( IsOk(), "must create the image before setting its type");
1648
1649     // type can be wxBITMAP_TYPE_INVALID to reset the image type to default
1650     wxASSERT_MSG( type != wxBITMAP_TYPE_MAX, "invalid bitmap type" );
1651
1652     M_IMGDATA->m_type = type;
1653 }
1654
1655 long wxImage::XYToIndex(int x, int y) const
1656 {
1657     if ( Ok() &&
1658             x >= 0 && y >= 0 &&
1659                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
1660     {
1661         return y*M_IMGDATA->m_width + x;
1662     }
1663
1664     return -1;
1665 }
1666
1667 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
1668 {
1669     long pos = XYToIndex(x, y);
1670     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1671
1672     AllocExclusive();
1673
1674     pos *= 3;
1675
1676     M_IMGDATA->m_data[ pos   ] = r;
1677     M_IMGDATA->m_data[ pos+1 ] = g;
1678     M_IMGDATA->m_data[ pos+2 ] = b;
1679 }
1680
1681 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
1682 {
1683     wxCHECK_RET( Ok(), wxT("invalid image") );
1684
1685     AllocExclusive();
1686
1687     wxRect rect(rect_);
1688     wxRect imageRect(0, 0, GetWidth(), GetHeight());
1689     if ( rect == wxRect() )
1690     {
1691         rect = imageRect;
1692     }
1693     else
1694     {
1695         wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
1696                      imageRect.Contains(rect.GetBottomRight()),
1697                      wxT("invalid bounding rectangle") );
1698     }
1699
1700     int x1 = rect.GetLeft(),
1701         y1 = rect.GetTop(),
1702         x2 = rect.GetRight() + 1,
1703         y2 = rect.GetBottom() + 1;
1704
1705     unsigned char *data wxDUMMY_INITIALIZE(NULL);
1706     int x, y, width = GetWidth();
1707     for (y = y1; y < y2; y++)
1708     {
1709         data = M_IMGDATA->m_data + (y*width + x1)*3;
1710         for (x = x1; x < x2; x++)
1711         {
1712             *data++ = r;
1713             *data++ = g;
1714             *data++ = b;
1715         }
1716     }
1717 }
1718
1719 unsigned char wxImage::GetRed( int x, int y ) const
1720 {
1721     long pos = XYToIndex(x, y);
1722     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1723
1724     pos *= 3;
1725
1726     return M_IMGDATA->m_data[pos];
1727 }
1728
1729 unsigned char wxImage::GetGreen( int x, int y ) const
1730 {
1731     long pos = XYToIndex(x, y);
1732     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1733
1734     pos *= 3;
1735
1736     return M_IMGDATA->m_data[pos+1];
1737 }
1738
1739 unsigned char wxImage::GetBlue( int x, int y ) const
1740 {
1741     long pos = XYToIndex(x, y);
1742     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1743
1744     pos *= 3;
1745
1746     return M_IMGDATA->m_data[pos+2];
1747 }
1748
1749 bool wxImage::IsOk() const
1750 {
1751     // image of 0 width or height can't be considered ok - at least because it
1752     // causes crashes in ConvertToBitmap() if we don't catch it in time
1753     wxImageRefData *data = M_IMGDATA;
1754     return data && data->m_ok && data->m_width && data->m_height;
1755 }
1756
1757 unsigned char *wxImage::GetData() const
1758 {
1759     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1760
1761     return M_IMGDATA->m_data;
1762 }
1763
1764 void wxImage::SetData( unsigned char *data, bool static_data  )
1765 {
1766     wxCHECK_RET( Ok(), wxT("invalid image") );
1767
1768     wxImageRefData *newRefData = new wxImageRefData();
1769
1770     newRefData->m_width = M_IMGDATA->m_width;
1771     newRefData->m_height = M_IMGDATA->m_height;
1772     newRefData->m_data = data;
1773     newRefData->m_ok = true;
1774     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1775     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1776     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1777     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1778     newRefData->m_static = static_data;
1779
1780     UnRef();
1781
1782     m_refData = newRefData;
1783 }
1784
1785 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1786 {
1787     wxImageRefData *newRefData = new wxImageRefData();
1788
1789     if (m_refData)
1790     {
1791         newRefData->m_width = new_width;
1792         newRefData->m_height = new_height;
1793         newRefData->m_data = data;
1794         newRefData->m_ok = true;
1795         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1796         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1797         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1798         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1799     }
1800     else
1801     {
1802         newRefData->m_width = new_width;
1803         newRefData->m_height = new_height;
1804         newRefData->m_data = data;
1805         newRefData->m_ok = true;
1806     }
1807     newRefData->m_static = static_data;
1808
1809     UnRef();
1810
1811     m_refData = newRefData;
1812 }
1813
1814 // ----------------------------------------------------------------------------
1815 // alpha channel support
1816 // ----------------------------------------------------------------------------
1817
1818 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1819 {
1820     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1821
1822     long pos = XYToIndex(x, y);
1823     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1824
1825     AllocExclusive();
1826
1827     M_IMGDATA->m_alpha[pos] = alpha;
1828 }
1829
1830 unsigned char wxImage::GetAlpha(int x, int y) const
1831 {
1832     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1833
1834     long pos = XYToIndex(x, y);
1835     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1836
1837     return M_IMGDATA->m_alpha[pos];
1838 }
1839
1840 bool
1841 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1842 {
1843     SetAlpha(NULL);
1844
1845     const int w = M_IMGDATA->m_width;
1846     const int h = M_IMGDATA->m_height;
1847
1848     unsigned char *alpha = GetAlpha();
1849     unsigned char *data = GetData();
1850
1851     for ( int y = 0; y < h; y++ )
1852     {
1853         for ( int x = 0; x < w; x++ )
1854         {
1855             *alpha++ = *data;
1856             *data++ = r;
1857             *data++ = g;
1858             *data++ = b;
1859         }
1860     }
1861
1862     return true;
1863 }
1864
1865 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1866 {
1867     wxCHECK_RET( Ok(), wxT("invalid image") );
1868
1869     AllocExclusive();
1870
1871     if ( !alpha )
1872     {
1873         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1874     }
1875
1876     if( !M_IMGDATA->m_staticAlpha )
1877         free(M_IMGDATA->m_alpha);
1878
1879     M_IMGDATA->m_alpha = alpha;
1880     M_IMGDATA->m_staticAlpha = static_data;
1881 }
1882
1883 unsigned char *wxImage::GetAlpha() const
1884 {
1885     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1886
1887     return M_IMGDATA->m_alpha;
1888 }
1889
1890 void wxImage::InitAlpha()
1891 {
1892     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1893
1894     // initialize memory for alpha channel
1895     SetAlpha();
1896
1897     unsigned char *alpha = M_IMGDATA->m_alpha;
1898     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1899
1900     if ( HasMask() )
1901     {
1902         // use the mask to initialize the alpha channel.
1903         const unsigned char * const alphaEnd = alpha + lenAlpha;
1904
1905         const unsigned char mr = M_IMGDATA->m_maskRed;
1906         const unsigned char mg = M_IMGDATA->m_maskGreen;
1907         const unsigned char mb = M_IMGDATA->m_maskBlue;
1908         for ( unsigned char *src = M_IMGDATA->m_data;
1909               alpha < alphaEnd;
1910               src += 3, alpha++ )
1911         {
1912             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1913                             ? wxIMAGE_ALPHA_TRANSPARENT
1914                             : wxIMAGE_ALPHA_OPAQUE;
1915         }
1916
1917         M_IMGDATA->m_hasMask = false;
1918     }
1919     else // no mask
1920     {
1921         // make the image fully opaque
1922         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1923     }
1924 }
1925
1926 void wxImage::ClearAlpha()
1927 {
1928     wxCHECK_RET( HasAlpha(), wxT("image already doesn't have an alpha channel") );
1929
1930     if ( !M_IMGDATA->m_staticAlpha )
1931         free( M_IMGDATA->m_alpha );
1932
1933     M_IMGDATA->m_alpha = NULL;
1934 }
1935
1936
1937 // ----------------------------------------------------------------------------
1938 // mask support
1939 // ----------------------------------------------------------------------------
1940
1941 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1942 {
1943     wxCHECK_RET( Ok(), wxT("invalid image") );
1944
1945     AllocExclusive();
1946
1947     M_IMGDATA->m_maskRed = r;
1948     M_IMGDATA->m_maskGreen = g;
1949     M_IMGDATA->m_maskBlue = b;
1950     M_IMGDATA->m_hasMask = true;
1951 }
1952
1953 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1954 {
1955     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1956
1957     if (M_IMGDATA->m_hasMask)
1958     {
1959         if (r) *r = M_IMGDATA->m_maskRed;
1960         if (g) *g = M_IMGDATA->m_maskGreen;
1961         if (b) *b = M_IMGDATA->m_maskBlue;
1962         return true;
1963     }
1964     else
1965     {
1966         FindFirstUnusedColour(r, g, b);
1967         return false;
1968     }
1969 }
1970
1971 unsigned char wxImage::GetMaskRed() const
1972 {
1973     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1974
1975     return M_IMGDATA->m_maskRed;
1976 }
1977
1978 unsigned char wxImage::GetMaskGreen() const
1979 {
1980     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1981
1982     return M_IMGDATA->m_maskGreen;
1983 }
1984
1985 unsigned char wxImage::GetMaskBlue() const
1986 {
1987     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1988
1989     return M_IMGDATA->m_maskBlue;
1990 }
1991
1992 void wxImage::SetMask( bool mask )
1993 {
1994     wxCHECK_RET( Ok(), wxT("invalid image") );
1995
1996     AllocExclusive();
1997
1998     M_IMGDATA->m_hasMask = mask;
1999 }
2000
2001 bool wxImage::HasMask() const
2002 {
2003     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2004
2005     return M_IMGDATA->m_hasMask;
2006 }
2007
2008 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
2009 {
2010     long pos = XYToIndex(x, y);
2011     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
2012
2013     // check mask
2014     if ( M_IMGDATA->m_hasMask )
2015     {
2016         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
2017         if ( p[0] == M_IMGDATA->m_maskRed &&
2018                 p[1] == M_IMGDATA->m_maskGreen &&
2019                     p[2] == M_IMGDATA->m_maskBlue )
2020         {
2021             return true;
2022         }
2023     }
2024
2025     // then check alpha
2026     if ( M_IMGDATA->m_alpha )
2027     {
2028         if ( M_IMGDATA->m_alpha[pos] < threshold )
2029         {
2030             // transparent enough
2031             return true;
2032         }
2033     }
2034
2035     // not transparent
2036     return false;
2037 }
2038
2039 bool wxImage::SetMaskFromImage(const wxImage& mask,
2040                                unsigned char mr, unsigned char mg, unsigned char mb)
2041 {
2042     // check that the images are the same size
2043     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
2044     {
2045         wxLogError( _("Image and mask have different sizes.") );
2046         return false;
2047     }
2048
2049     // find unused colour
2050     unsigned char r,g,b ;
2051     if (!FindFirstUnusedColour(&r, &g, &b))
2052     {
2053         wxLogError( _("No unused colour in image being masked.") );
2054         return false ;
2055     }
2056
2057     AllocExclusive();
2058
2059     unsigned char *imgdata = GetData();
2060     unsigned char *maskdata = mask.GetData();
2061
2062     const int w = GetWidth();
2063     const int h = GetHeight();
2064
2065     for (int j = 0; j < h; j++)
2066     {
2067         for (int i = 0; i < w; i++)
2068         {
2069             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
2070             {
2071                 imgdata[0] = r;
2072                 imgdata[1] = g;
2073                 imgdata[2] = b;
2074             }
2075             imgdata  += 3;
2076             maskdata += 3;
2077         }
2078     }
2079
2080     SetMaskColour(r, g, b);
2081     SetMask(true);
2082
2083     return true;
2084 }
2085
2086 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
2087 {
2088     if ( !HasAlpha() )
2089         return false;
2090
2091     unsigned char mr, mg, mb;
2092     if ( !FindFirstUnusedColour(&mr, &mg, &mb) )
2093     {
2094         wxLogError( _("No unused colour in image being masked.") );
2095         return false;
2096     }
2097
2098     return ConvertAlphaToMask(mr, mg, mb, threshold);
2099 }
2100
2101 bool wxImage::ConvertAlphaToMask(unsigned char mr,
2102                                  unsigned char mg,
2103                                  unsigned char mb,
2104                                  unsigned char threshold)
2105 {
2106     if ( !HasAlpha() )
2107         return false;
2108
2109     AllocExclusive();
2110
2111     SetMask(true);
2112     SetMaskColour(mr, mg, mb);
2113
2114     unsigned char *imgdata = GetData();
2115     unsigned char *alphadata = GetAlpha();
2116
2117     int w = GetWidth();
2118     int h = GetHeight();
2119
2120     for (int y = 0; y < h; y++)
2121     {
2122         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
2123         {
2124             if (*alphadata < threshold)
2125             {
2126                 imgdata[0] = mr;
2127                 imgdata[1] = mg;
2128                 imgdata[2] = mb;
2129             }
2130         }
2131     }
2132
2133     if ( !M_IMGDATA->m_staticAlpha )
2134         free(M_IMGDATA->m_alpha);
2135
2136     M_IMGDATA->m_alpha = NULL;
2137     M_IMGDATA->m_staticAlpha = false;
2138
2139     return true;
2140 }
2141
2142 // ----------------------------------------------------------------------------
2143 // Palette functions
2144 // ----------------------------------------------------------------------------
2145
2146 #if wxUSE_PALETTE
2147
2148 bool wxImage::HasPalette() const
2149 {
2150     if (!Ok())
2151         return false;
2152
2153     return M_IMGDATA->m_palette.Ok();
2154 }
2155
2156 const wxPalette& wxImage::GetPalette() const
2157 {
2158     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
2159
2160     return M_IMGDATA->m_palette;
2161 }
2162
2163 void wxImage::SetPalette(const wxPalette& palette)
2164 {
2165     wxCHECK_RET( Ok(), wxT("invalid image") );
2166
2167     AllocExclusive();
2168
2169     M_IMGDATA->m_palette = palette;
2170 }
2171
2172 #endif // wxUSE_PALETTE
2173
2174 // ----------------------------------------------------------------------------
2175 // Option functions (arbitrary name/value mapping)
2176 // ----------------------------------------------------------------------------
2177
2178 void wxImage::SetOption(const wxString& name, const wxString& value)
2179 {
2180     AllocExclusive();
2181
2182     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2183     if ( idx == wxNOT_FOUND )
2184     {
2185         M_IMGDATA->m_optionNames.Add(name);
2186         M_IMGDATA->m_optionValues.Add(value);
2187     }
2188     else
2189     {
2190         M_IMGDATA->m_optionNames[idx] = name;
2191         M_IMGDATA->m_optionValues[idx] = value;
2192     }
2193 }
2194
2195 void wxImage::SetOption(const wxString& name, int value)
2196 {
2197     wxString valStr;
2198     valStr.Printf(wxT("%d"), value);
2199     SetOption(name, valStr);
2200 }
2201
2202 wxString wxImage::GetOption(const wxString& name) const
2203 {
2204     if ( !M_IMGDATA )
2205         return wxEmptyString;
2206
2207     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2208     if ( idx == wxNOT_FOUND )
2209         return wxEmptyString;
2210     else
2211         return M_IMGDATA->m_optionValues[idx];
2212 }
2213
2214 int wxImage::GetOptionInt(const wxString& name) const
2215 {
2216     return wxAtoi(GetOption(name));
2217 }
2218
2219 bool wxImage::HasOption(const wxString& name) const
2220 {
2221     return M_IMGDATA ? M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND
2222                      : false;
2223 }
2224
2225 // ----------------------------------------------------------------------------
2226 // image I/O
2227 // ----------------------------------------------------------------------------
2228
2229 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2230                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type),
2231                         int WXUNUSED_UNLESS_STREAMS(index) )
2232 {
2233 #if HAS_FILE_STREAMS
2234     if (wxFileExists(filename))
2235     {
2236         wxImageFileInputStream stream(filename);
2237         wxBufferedInputStream bstream( stream );
2238         return LoadFile(bstream, type, index);
2239     }
2240     else
2241     {
2242         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2243
2244         return false;
2245     }
2246 #else // !HAS_FILE_STREAMS
2247     return false;
2248 #endif // HAS_FILE_STREAMS
2249 }
2250
2251 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2252                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
2253                         int WXUNUSED_UNLESS_STREAMS(index) )
2254 {
2255 #if HAS_FILE_STREAMS
2256     if (wxFileExists(filename))
2257     {
2258         wxImageFileInputStream stream(filename);
2259         wxBufferedInputStream bstream( stream );
2260         return LoadFile(bstream, mimetype, index);
2261     }
2262     else
2263     {
2264         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2265
2266         return false;
2267     }
2268 #else // !HAS_FILE_STREAMS
2269     return false;
2270 #endif // HAS_FILE_STREAMS
2271 }
2272
2273
2274 bool wxImage::SaveFile( const wxString& filename ) const
2275 {
2276     wxString ext = filename.AfterLast('.').Lower();
2277
2278     wxImageHandler *handler = FindHandler(ext, wxBITMAP_TYPE_ANY);
2279     if ( !handler)
2280     {
2281        wxLogError(_("Can't save image to file '%s': unknown extension."),
2282                   filename);
2283        return false;
2284     }
2285
2286     return SaveFile(filename, handler->GetType());
2287 }
2288
2289 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2290                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type) ) const
2291 {
2292 #if HAS_FILE_STREAMS
2293     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2294
2295     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2296
2297     wxImageFileOutputStream stream(filename);
2298
2299     if ( stream.IsOk() )
2300     {
2301         wxBufferedOutputStream bstream( stream );
2302         return SaveFile(bstream, type);
2303     }
2304 #endif // HAS_FILE_STREAMS
2305
2306     return false;
2307 }
2308
2309 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2310                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
2311 {
2312 #if HAS_FILE_STREAMS
2313     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2314
2315     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2316
2317     wxImageFileOutputStream stream(filename);
2318
2319     if ( stream.IsOk() )
2320     {
2321         wxBufferedOutputStream bstream( stream );
2322         return SaveFile(bstream, mimetype);
2323     }
2324 #endif // HAS_FILE_STREAMS
2325
2326     return false;
2327 }
2328
2329 bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
2330 {
2331 #if HAS_FILE_STREAMS
2332     wxImageFileInputStream stream(name);
2333     return CanRead(stream);
2334 #else
2335     return false;
2336 #endif
2337 }
2338
2339 int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
2340                             wxBitmapType WXUNUSED_UNLESS_STREAMS(type) )
2341 {
2342 #if HAS_FILE_STREAMS
2343     wxImageFileInputStream stream(name);
2344     if (stream.Ok())
2345         return GetImageCount(stream, type);
2346 #endif
2347
2348   return 0;
2349 }
2350
2351 #if wxUSE_STREAMS
2352
2353 bool wxImage::CanRead( wxInputStream &stream )
2354 {
2355     const wxList& list = GetHandlers();
2356
2357     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2358     {
2359         wxImageHandler *handler=(wxImageHandler*)node->GetData();
2360         if (handler->CanRead( stream ))
2361             return true;
2362     }
2363
2364     return false;
2365 }
2366
2367 int wxImage::GetImageCount( wxInputStream &stream, wxBitmapType type )
2368 {
2369     wxImageHandler *handler;
2370
2371     if ( type == wxBITMAP_TYPE_ANY )
2372     {
2373         const wxList& list = GetHandlers();
2374
2375         for ( wxList::compatibility_iterator node = list.GetFirst();
2376               node;
2377               node = node->GetNext() )
2378         {
2379              handler = (wxImageHandler*)node->GetData();
2380              if ( handler->CanRead(stream) )
2381              {
2382                  const int count = handler->GetImageCount(stream);
2383                  if ( count >= 0 )
2384                      return count;
2385              }
2386
2387         }
2388
2389         wxLogWarning(_("No handler found for image type."));
2390         return 0;
2391     }
2392
2393     handler = FindHandler(type);
2394
2395     if ( !handler )
2396     {
2397         wxLogWarning(_("No image handler for type %d defined."), type);
2398         return false;
2399     }
2400
2401     if ( handler->CanRead(stream) )
2402     {
2403         return handler->GetImageCount(stream);
2404     }
2405     else
2406     {
2407         wxLogError(_("Image file is not of type %d."), type);
2408         return 0;
2409     }
2410 }
2411
2412 bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
2413 {
2414     // save the options values which can be clobbered by the handler (e.g. many
2415     // of them call Destroy() before trying to load the file)
2416     const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
2417                    maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
2418
2419     if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
2420         return false;
2421
2422     // rescale the image to the specified size if needed
2423     if ( maxWidth || maxHeight )
2424     {
2425         const unsigned widthOrig = GetWidth(),
2426                        heightOrig = GetHeight();
2427
2428         // this uses the same (trivial) algorithm as the JPEG handler
2429         unsigned width = widthOrig,
2430                  height = heightOrig;
2431         while ( (maxWidth && width > maxWidth) ||
2432                     (maxHeight && height > maxHeight) )
2433         {
2434             width /= 2;
2435             height /= 2;
2436         }
2437
2438         if ( width != widthOrig || height != heightOrig )
2439             Rescale(width, height, wxIMAGE_QUALITY_HIGH);
2440     }
2441
2442     // Set this after Rescale, which currently does not preserve it
2443     M_IMGDATA->m_type = handler.GetType();
2444
2445     return true;
2446 }
2447
2448 bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
2449 {
2450     AllocExclusive();
2451
2452     wxImageHandler *handler;
2453
2454     if ( type == wxBITMAP_TYPE_ANY )
2455     {
2456         const wxList& list = GetHandlers();
2457         for ( wxList::compatibility_iterator node = list.GetFirst();
2458               node;
2459               node = node->GetNext() )
2460         {
2461              handler = (wxImageHandler*)node->GetData();
2462              if ( handler->CanRead(stream) && DoLoad(*handler, stream, index) )
2463                  return true;
2464         }
2465
2466         wxLogWarning( _("No handler found for image type.") );
2467
2468         return false;
2469     }
2470     //else: have specific type
2471
2472     handler = FindHandler(type);
2473     if ( !handler )
2474     {
2475         wxLogWarning( _("No image handler for type %d defined."), type );
2476         return false;
2477     }
2478
2479     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2480     {
2481         wxLogError(_("Image file is not of type %d."), type);
2482         return false;
2483     }
2484
2485     return DoLoad(*handler, stream, index);
2486 }
2487
2488 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
2489 {
2490     UnRef();
2491
2492     m_refData = new wxImageRefData;
2493
2494     wxImageHandler *handler = FindHandlerMime(mimetype);
2495
2496     if ( !handler )
2497     {
2498         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2499         return false;
2500     }
2501
2502     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2503     {
2504         wxLogError(_("Image file is not of type %s."), mimetype);
2505         return false;
2506     }
2507
2508     return DoLoad(*handler, stream, index);
2509 }
2510
2511 bool wxImage::DoSave(wxImageHandler& handler, wxOutputStream& stream) const
2512 {
2513     wxImage * const self = const_cast<wxImage *>(this);
2514     if ( !handler.SaveFile(self, stream) )
2515         return false;
2516
2517     M_IMGDATA->m_type = handler.GetType();
2518     return true;
2519 }
2520
2521 bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
2522 {
2523     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2524
2525     wxImageHandler *handler = FindHandler(type);
2526     if ( !handler )
2527     {
2528         wxLogWarning( _("No image handler for type %d defined."), type );
2529         return false;
2530     }
2531
2532     return DoSave(*handler, stream);
2533 }
2534
2535 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
2536 {
2537     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2538
2539     wxImageHandler *handler = FindHandlerMime(mimetype);
2540     if ( !handler )
2541     {
2542         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2543     }
2544
2545     return DoSave(*handler, stream);
2546 }
2547
2548 #endif // wxUSE_STREAMS
2549
2550 // ----------------------------------------------------------------------------
2551 // image I/O handlers
2552 // ----------------------------------------------------------------------------
2553
2554 void wxImage::AddHandler( wxImageHandler *handler )
2555 {
2556     // Check for an existing handler of the type being added.
2557     if (FindHandler( handler->GetType() ) == 0)
2558     {
2559         sm_handlers.Append( handler );
2560     }
2561     else
2562     {
2563         // This is not documented behaviour, merely the simplest 'fix'
2564         // for preventing duplicate additions.  If someone ever has
2565         // a good reason to add and remove duplicate handlers (and they
2566         // may) we should probably refcount the duplicates.
2567         //   also an issue in InsertHandler below.
2568
2569         wxLogDebug( wxT("Adding duplicate image handler for '%s'"),
2570                     handler->GetName().c_str() );
2571         delete handler;
2572     }
2573 }
2574
2575 void wxImage::InsertHandler( wxImageHandler *handler )
2576 {
2577     // Check for an existing handler of the type being added.
2578     if (FindHandler( handler->GetType() ) == 0)
2579     {
2580         sm_handlers.Insert( handler );
2581     }
2582     else
2583     {
2584         // see AddHandler for additional comments.
2585         wxLogDebug( wxT("Inserting duplicate image handler for '%s'"),
2586                     handler->GetName().c_str() );
2587         delete handler;
2588     }
2589 }
2590
2591 bool wxImage::RemoveHandler( const wxString& name )
2592 {
2593     wxImageHandler *handler = FindHandler(name);
2594     if (handler)
2595     {
2596         sm_handlers.DeleteObject(handler);
2597         delete handler;
2598         return true;
2599     }
2600     else
2601         return false;
2602 }
2603
2604 wxImageHandler *wxImage::FindHandler( const wxString& name )
2605 {
2606     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2607     while (node)
2608     {
2609         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2610         if (handler->GetName().Cmp(name) == 0) return handler;
2611
2612         node = node->GetNext();
2613     }
2614     return NULL;
2615 }
2616
2617 wxImageHandler *wxImage::FindHandler( const wxString& extension, wxBitmapType bitmapType )
2618 {
2619     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2620     while (node)
2621     {
2622         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2623         if ((bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType))
2624         {
2625             if (handler->GetExtension() == extension)
2626                 return handler;
2627             if (handler->GetAltExtensions().Index(extension, false) != wxNOT_FOUND)
2628                 return handler;
2629         }
2630         node = node->GetNext();
2631     }
2632     return NULL;
2633 }
2634
2635 wxImageHandler *wxImage::FindHandler(wxBitmapType bitmapType )
2636 {
2637     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2638     while (node)
2639     {
2640         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2641         if (handler->GetType() == bitmapType) return handler;
2642         node = node->GetNext();
2643     }
2644     return NULL;
2645 }
2646
2647 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
2648 {
2649     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2650     while (node)
2651     {
2652         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2653         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
2654         node = node->GetNext();
2655     }
2656     return NULL;
2657 }
2658
2659 void wxImage::InitStandardHandlers()
2660 {
2661 #if wxUSE_STREAMS
2662     AddHandler(new wxBMPHandler);
2663 #endif // wxUSE_STREAMS
2664 }
2665
2666 void wxImage::CleanUpHandlers()
2667 {
2668     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2669     while (node)
2670     {
2671         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2672         wxList::compatibility_iterator next = node->GetNext();
2673         delete handler;
2674         node = next;
2675     }
2676
2677     sm_handlers.Clear();
2678 }
2679
2680 wxString wxImage::GetImageExtWildcard()
2681 {
2682     wxString fmts;
2683
2684     wxList& Handlers = wxImage::GetHandlers();
2685     wxList::compatibility_iterator Node = Handlers.GetFirst();
2686     while ( Node )
2687     {
2688         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
2689         fmts += wxT("*.") + Handler->GetExtension();
2690         for (size_t i = 0; i < Handler->GetAltExtensions().size(); i++)
2691             fmts += wxT(";*.") + Handler->GetAltExtensions()[i];
2692         Node = Node->GetNext();
2693         if ( Node ) fmts += wxT(";");
2694     }
2695
2696     return wxT("(") + fmts + wxT(")|") + fmts;
2697 }
2698
2699 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
2700 {
2701     const double red = rgb.red / 255.0,
2702                  green = rgb.green / 255.0,
2703                  blue = rgb.blue / 255.0;
2704
2705     // find the min and max intensity (and remember which one was it for the
2706     // latter)
2707     double minimumRGB = red;
2708     if ( green < minimumRGB )
2709         minimumRGB = green;
2710     if ( blue < minimumRGB )
2711         minimumRGB = blue;
2712
2713     enum { RED, GREEN, BLUE } chMax = RED;
2714     double maximumRGB = red;
2715     if ( green > maximumRGB )
2716     {
2717         chMax = GREEN;
2718         maximumRGB = green;
2719     }
2720     if ( blue > maximumRGB )
2721     {
2722         chMax = BLUE;
2723         maximumRGB = blue;
2724     }
2725
2726     const double value = maximumRGB;
2727
2728     double hue = 0.0, saturation;
2729     const double deltaRGB = maximumRGB - minimumRGB;
2730     if ( wxIsNullDouble(deltaRGB) )
2731     {
2732         // Gray has no color
2733         hue = 0.0;
2734         saturation = 0.0;
2735     }
2736     else
2737     {
2738         switch ( chMax )
2739         {
2740             case RED:
2741                 hue = (green - blue) / deltaRGB;
2742                 break;
2743
2744             case GREEN:
2745                 hue = 2.0 + (blue - red) / deltaRGB;
2746                 break;
2747
2748             case BLUE:
2749                 hue = 4.0 + (red - green) / deltaRGB;
2750                 break;
2751
2752             default:
2753                 wxFAIL_MSG(wxT("hue not specified"));
2754                 break;
2755         }
2756
2757         hue /= 6.0;
2758
2759         if ( hue < 0.0 )
2760             hue += 1.0;
2761
2762         saturation = deltaRGB / maximumRGB;
2763     }
2764
2765     return HSVValue(hue, saturation, value);
2766 }
2767
2768 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
2769 {
2770     double red, green, blue;
2771
2772     if ( wxIsNullDouble(hsv.saturation) )
2773     {
2774         // Grey
2775         red = hsv.value;
2776         green = hsv.value;
2777         blue = hsv.value;
2778     }
2779     else // not grey
2780     {
2781         double hue = hsv.hue * 6.0;      // sector 0 to 5
2782         int i = (int)floor(hue);
2783         double f = hue - i;          // fractional part of h
2784         double p = hsv.value * (1.0 - hsv.saturation);
2785
2786         switch (i)
2787         {
2788             case 0:
2789                 red = hsv.value;
2790                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2791                 blue = p;
2792                 break;
2793
2794             case 1:
2795                 red = hsv.value * (1.0 - hsv.saturation * f);
2796                 green = hsv.value;
2797                 blue = p;
2798                 break;
2799
2800             case 2:
2801                 red = p;
2802                 green = hsv.value;
2803                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2804                 break;
2805
2806             case 3:
2807                 red = p;
2808                 green = hsv.value * (1.0 - hsv.saturation * f);
2809                 blue = hsv.value;
2810                 break;
2811
2812             case 4:
2813                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2814                 green = p;
2815                 blue = hsv.value;
2816                 break;
2817
2818             default:    // case 5:
2819                 red = hsv.value;
2820                 green = p;
2821                 blue = hsv.value * (1.0 - hsv.saturation * f);
2822                 break;
2823         }
2824     }
2825
2826     return RGBValue((unsigned char)(red * 255.0),
2827                     (unsigned char)(green * 255.0),
2828                     (unsigned char)(blue * 255.0));
2829 }
2830
2831 /*
2832  * Rotates the hue of each pixel of the image. angle is a double in the range
2833  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2834  */
2835 void wxImage::RotateHue(double angle)
2836 {
2837     AllocExclusive();
2838
2839     unsigned char *srcBytePtr;
2840     unsigned char *dstBytePtr;
2841     unsigned long count;
2842     wxImage::HSVValue hsv;
2843     wxImage::RGBValue rgb;
2844
2845     wxASSERT (angle >= -1.0 && angle <= 1.0);
2846     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2847     if ( count > 0 && !wxIsNullDouble(angle) )
2848     {
2849         srcBytePtr = M_IMGDATA->m_data;
2850         dstBytePtr = srcBytePtr;
2851         do
2852         {
2853             rgb.red = *srcBytePtr++;
2854             rgb.green = *srcBytePtr++;
2855             rgb.blue = *srcBytePtr++;
2856             hsv = RGBtoHSV(rgb);
2857
2858             hsv.hue = hsv.hue + angle;
2859             if (hsv.hue > 1.0)
2860                 hsv.hue = hsv.hue - 1.0;
2861             else if (hsv.hue < 0.0)
2862                 hsv.hue = hsv.hue + 1.0;
2863
2864             rgb = HSVtoRGB(hsv);
2865             *dstBytePtr++ = rgb.red;
2866             *dstBytePtr++ = rgb.green;
2867             *dstBytePtr++ = rgb.blue;
2868         } while (--count != 0);
2869     }
2870 }
2871
2872 //-----------------------------------------------------------------------------
2873 // wxImageHandler
2874 //-----------------------------------------------------------------------------
2875
2876 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2877
2878 #if wxUSE_STREAMS
2879 int wxImageHandler::GetImageCount( wxInputStream& stream )
2880 {
2881     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2882     //       wxImageHandler::CallDoCanRead
2883
2884     if ( !stream.IsSeekable() )
2885         return false;        // can't test unseekable stream
2886
2887     wxFileOffset posOld = stream.TellI();
2888     int n = DoGetImageCount(stream);
2889
2890     // restore the old position to be able to test other formats and so on
2891     if ( stream.SeekI(posOld) == wxInvalidOffset )
2892     {
2893         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2894
2895         // reading would fail anyhow as we're not at the right position
2896         return false;
2897     }
2898
2899     return n;
2900 }
2901
2902 bool wxImageHandler::CanRead( const wxString& name )
2903 {
2904     if (wxFileExists(name))
2905     {
2906         wxImageFileInputStream stream(name);
2907         return CanRead(stream);
2908     }
2909
2910     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2911
2912     return false;
2913 }
2914
2915 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2916 {
2917     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2918     //       wxImageHandler::GetImageCount
2919
2920     if ( !stream.IsSeekable() )
2921         return false;        // can't test unseekable stream
2922
2923     wxFileOffset posOld = stream.TellI();
2924     bool ok = DoCanRead(stream);
2925
2926     // restore the old position to be able to test other formats and so on
2927     if ( stream.SeekI(posOld) == wxInvalidOffset )
2928     {
2929         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2930
2931         // reading would fail anyhow as we're not at the right position
2932         return false;
2933     }
2934
2935     return ok;
2936 }
2937
2938 #endif // wxUSE_STREAMS
2939
2940 /* static */
2941 wxImageResolution
2942 wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
2943 {
2944     wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, wxT("NULL pointer") );
2945
2946     if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
2947          image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
2948     {
2949         *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
2950         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
2951     }
2952     else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) )
2953     {
2954         *x =
2955         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
2956     }
2957     else // no resolution options specified
2958     {
2959         *x =
2960         *y = 0;
2961
2962         return wxIMAGE_RESOLUTION_NONE;
2963     }
2964
2965     // get the resolution unit too
2966     int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
2967     if ( !resUnit )
2968     {
2969         // this is the default
2970         resUnit = wxIMAGE_RESOLUTION_INCHES;
2971     }
2972
2973     return (wxImageResolution)resUnit;
2974 }
2975
2976 // ----------------------------------------------------------------------------
2977 // image histogram stuff
2978 // ----------------------------------------------------------------------------
2979
2980 bool
2981 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2982                                         unsigned char *g,
2983                                         unsigned char *b,
2984                                         unsigned char r2,
2985                                         unsigned char b2,
2986                                         unsigned char g2) const
2987 {
2988     unsigned long key = MakeKey(r2, g2, b2);
2989
2990     while ( find(key) != end() )
2991     {
2992         // color already used
2993         r2++;
2994         if ( r2 >= 255 )
2995         {
2996             r2 = 0;
2997             g2++;
2998             if ( g2 >= 255 )
2999             {
3000                 g2 = 0;
3001                 b2++;
3002                 if ( b2 >= 255 )
3003                 {
3004                     wxLogError(_("No unused colour in image.") );
3005                     return false;
3006                 }
3007             }
3008         }
3009
3010         key = MakeKey(r2, g2, b2);
3011     }
3012
3013     if ( r )
3014         *r = r2;
3015     if ( g )
3016         *g = g2;
3017     if ( b )
3018         *b = b2;
3019
3020     return true;
3021 }
3022
3023 bool
3024 wxImage::FindFirstUnusedColour(unsigned char *r,
3025                                unsigned char *g,
3026                                unsigned char *b,
3027                                unsigned char r2,
3028                                unsigned char b2,
3029                                unsigned char g2) const
3030 {
3031     wxImageHistogram histogram;
3032
3033     ComputeHistogram(histogram);
3034
3035     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
3036 }
3037
3038
3039
3040 // GRG, Dic/99
3041 // Counts and returns the number of different colours. Optionally stops
3042 // when it exceeds 'stopafter' different colours. This is useful, for
3043 // example, to see if the image can be saved as 8-bit (256 colour or
3044 // less, in this case it would be invoked as CountColours(256)). Default
3045 // value for stopafter is -1 (don't care).
3046 //
3047 unsigned long wxImage::CountColours( unsigned long stopafter ) const
3048 {
3049     wxHashTable h;
3050     wxObject dummy;
3051     unsigned char r, g, b;
3052     unsigned char *p;
3053     unsigned long size, nentries, key;
3054
3055     p = GetData();
3056     size = GetWidth() * GetHeight();
3057     nentries = 0;
3058
3059     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
3060     {
3061         r = *(p++);
3062         g = *(p++);
3063         b = *(p++);
3064         key = wxImageHistogram::MakeKey(r, g, b);
3065
3066         if (h.Get(key) == NULL)
3067         {
3068             h.Put(key, &dummy);
3069             nentries++;
3070         }
3071     }
3072
3073     return nentries;
3074 }
3075
3076
3077 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
3078 {
3079     unsigned char *p = GetData();
3080     unsigned long nentries = 0;
3081
3082     h.clear();
3083
3084     const unsigned long size = GetWidth() * GetHeight();
3085
3086     unsigned char r, g, b;
3087     for ( unsigned long n = 0; n < size; n++ )
3088     {
3089         r = *p++;
3090         g = *p++;
3091         b = *p++;
3092
3093         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
3094
3095         if ( entry.value++ == 0 )
3096             entry.index = nentries++;
3097     }
3098
3099     return nentries;
3100 }
3101
3102 /*
3103  * Rotation code by Carlos Moreno
3104  */
3105
3106 static const double wxROTATE_EPSILON = 1e-10;
3107
3108 // Auxiliary function to rotate a point (x,y) with respect to point p0
3109 // make it inline and use a straight return to facilitate optimization
3110 // also, the function receives the sine and cosine of the angle to avoid
3111 // repeating the time-consuming calls to these functions -- sin/cos can
3112 // be computed and stored in the calling function.
3113
3114 static inline wxRealPoint
3115 wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
3116               const wxRealPoint& p0)
3117 {
3118     return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
3119                        p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
3120 }
3121
3122 static inline wxRealPoint
3123 wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
3124               const wxRealPoint & p0)
3125 {
3126     return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
3127 }
3128
3129 wxImage wxImage::Rotate(double angle,
3130                         const wxPoint& centre_of_rotation,
3131                         bool interpolating,
3132                         wxPoint *offset_after_rotation) const
3133 {
3134     // screen coordinates are a mirror image of "real" coordinates
3135     angle = -angle;
3136
3137     const bool has_alpha = HasAlpha();
3138
3139     const int w = GetWidth();
3140     const int h = GetHeight();
3141
3142     int i;
3143
3144     // Create pointer-based array to accelerate access to wxImage's data
3145     unsigned char ** data = new unsigned char * [h];
3146     data[0] = GetData();
3147     for (i = 1; i < h; i++)
3148         data[i] = data[i - 1] + (3 * w);
3149
3150     // Same for alpha channel
3151     unsigned char ** alpha = NULL;
3152     if (has_alpha)
3153     {
3154         alpha = new unsigned char * [h];
3155         alpha[0] = GetAlpha();
3156         for (i = 1; i < h; i++)
3157             alpha[i] = alpha[i - 1] + w;
3158     }
3159
3160     // precompute coefficients for rotation formula
3161     const double cos_angle = cos(angle);
3162     const double sin_angle = sin(angle);
3163
3164     // Create new Image to store the result
3165     // First, find rectangle that covers the rotated image;  to do that,
3166     // rotate the four corners
3167
3168     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
3169
3170     wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
3171     wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
3172     wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
3173     wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
3174
3175     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
3176     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
3177     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
3178     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
3179
3180     // Create rotated image
3181     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
3182     // With alpha channel
3183     if (has_alpha)
3184         rotated.SetAlpha();
3185
3186     if (offset_after_rotation != NULL)
3187     {
3188         *offset_after_rotation = wxPoint (x1a, y1a);
3189     }
3190
3191     // the rotated (destination) image is always accessed sequentially via this
3192     // pointer, there is no need for pointer-based arrays here
3193     unsigned char *dst = rotated.GetData();
3194
3195     unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
3196
3197     // if the original image has a mask, use its RGB values as the blank pixel,
3198     // else, fall back to default (black).
3199     unsigned char blank_r = 0;
3200     unsigned char blank_g = 0;
3201     unsigned char blank_b = 0;
3202
3203     if (HasMask())
3204     {
3205         blank_r = GetMaskRed();
3206         blank_g = GetMaskGreen();
3207         blank_b = GetMaskBlue();
3208         rotated.SetMaskColour( blank_r, blank_g, blank_b );
3209     }
3210
3211     // Now, for each point of the rotated image, find where it came from, by
3212     // performing an inverse rotation (a rotation of -angle) and getting the
3213     // pixel at those coordinates
3214
3215     const int rH = rotated.GetHeight();
3216     const int rW = rotated.GetWidth();
3217
3218     // do the (interpolating) test outside of the loops, so that it is done
3219     // only once, instead of repeating it for each pixel.
3220     if (interpolating)
3221     {
3222         for (int y = 0; y < rH; y++)
3223         {
3224             for (int x = 0; x < rW; x++)
3225             {
3226                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3227
3228                 if (-0.25 < src.x && src.x < w - 0.75 &&
3229                     -0.25 < src.y && src.y < h - 0.75)
3230                 {
3231                     // interpolate using the 4 enclosing grid-points.  Those
3232                     // points can be obtained using floor and ceiling of the
3233                     // exact coordinates of the point
3234                     int x1, y1, x2, y2;
3235
3236                     if (0 < src.x && src.x < w - 1)
3237                     {
3238                         x1 = wxRound(floor(src.x));
3239                         x2 = wxRound(ceil(src.x));
3240                     }
3241                     else    // else means that x is near one of the borders (0 or width-1)
3242                     {
3243                         x1 = x2 = wxRound (src.x);
3244                     }
3245
3246                     if (0 < src.y && src.y < h - 1)
3247                     {
3248                         y1 = wxRound(floor(src.y));
3249                         y2 = wxRound(ceil(src.y));
3250                     }
3251                     else
3252                     {
3253                         y1 = y2 = wxRound (src.y);
3254                     }
3255
3256                     // get four points and the distances (square of the distance,
3257                     // for efficiency reasons) for the interpolation formula
3258
3259                     // GRG: Do not calculate the points until they are
3260                     //      really needed -- this way we can calculate
3261                     //      just one, instead of four, if d1, d2, d3
3262                     //      or d4 are < wxROTATE_EPSILON
3263
3264                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
3265                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
3266                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
3267                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
3268
3269                     // Now interpolate as a weighted average of the four surrounding
3270                     // points, where the weights are the distances to each of those points
3271
3272                     // If the point is exactly at one point of the grid of the source
3273                     // image, then don't interpolate -- just assign the pixel
3274
3275                     // d1,d2,d3,d4 are positive -- no need for abs()
3276                     if (d1 < wxROTATE_EPSILON)
3277                     {
3278                         unsigned char *p = data[y1] + (3 * x1);
3279                         *(dst++) = *(p++);
3280                         *(dst++) = *(p++);
3281                         *(dst++) = *p;
3282
3283                         if (has_alpha)
3284                             *(alpha_dst++) = *(alpha[y1] + x1);
3285                     }
3286                     else if (d2 < wxROTATE_EPSILON)
3287                     {
3288                         unsigned char *p = data[y1] + (3 * x2);
3289                         *(dst++) = *(p++);
3290                         *(dst++) = *(p++);
3291                         *(dst++) = *p;
3292
3293                         if (has_alpha)
3294                             *(alpha_dst++) = *(alpha[y1] + x2);
3295                     }
3296                     else if (d3 < wxROTATE_EPSILON)
3297                     {
3298                         unsigned char *p = data[y2] + (3 * x2);
3299                         *(dst++) = *(p++);
3300                         *(dst++) = *(p++);
3301                         *(dst++) = *p;
3302
3303                         if (has_alpha)
3304                             *(alpha_dst++) = *(alpha[y2] + x2);
3305                     }
3306                     else if (d4 < wxROTATE_EPSILON)
3307                     {
3308                         unsigned char *p = data[y2] + (3 * x1);
3309                         *(dst++) = *(p++);
3310                         *(dst++) = *(p++);
3311                         *(dst++) = *p;
3312
3313                         if (has_alpha)
3314                             *(alpha_dst++) = *(alpha[y2] + x1);
3315                     }
3316                     else
3317                     {
3318                         // weights for the weighted average are proportional to the inverse of the distance
3319                         unsigned char *v1 = data[y1] + (3 * x1);
3320                         unsigned char *v2 = data[y1] + (3 * x2);
3321                         unsigned char *v3 = data[y2] + (3 * x2);
3322                         unsigned char *v4 = data[y2] + (3 * x1);
3323
3324                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
3325
3326                         // GRG: Unrolled.
3327
3328                         *(dst++) = (unsigned char)
3329                             ( (w1 * *(v1++) + w2 * *(v2++) +
3330                                w3 * *(v3++) + w4 * *(v4++)) /
3331                               (w1 + w2 + w3 + w4) );
3332                         *(dst++) = (unsigned char)
3333                             ( (w1 * *(v1++) + w2 * *(v2++) +
3334                                w3 * *(v3++) + w4 * *(v4++)) /
3335                               (w1 + w2 + w3 + w4) );
3336                         *(dst++) = (unsigned char)
3337                             ( (w1 * *v1 + w2 * *v2 +
3338                                w3 * *v3 + w4 * *v4) /
3339                               (w1 + w2 + w3 + w4) );
3340
3341                         if (has_alpha)
3342                         {
3343                             v1 = alpha[y1] + (x1);
3344                             v2 = alpha[y1] + (x2);
3345                             v3 = alpha[y2] + (x2);
3346                             v4 = alpha[y2] + (x1);
3347
3348                             *(alpha_dst++) = (unsigned char)
3349                                 ( (w1 * *v1 + w2 * *v2 +
3350                                    w3 * *v3 + w4 * *v4) /
3351                                   (w1 + w2 + w3 + w4) );
3352                         }
3353                     }
3354                 }
3355                 else
3356                 {
3357                     *(dst++) = blank_r;
3358                     *(dst++) = blank_g;
3359                     *(dst++) = blank_b;
3360
3361                     if (has_alpha)
3362                         *(alpha_dst++) = 0;
3363                 }
3364             }
3365         }
3366     }
3367     else // not interpolating
3368     {
3369         for (int y = 0; y < rH; y++)
3370         {
3371             for (int x = 0; x < rW; x++)
3372             {
3373                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3374
3375                 const int xs = wxRound (src.x);      // wxRound rounds to the
3376                 const int ys = wxRound (src.y);      // closest integer
3377
3378                 if (0 <= xs && xs < w && 0 <= ys && ys < h)
3379                 {
3380                     unsigned char *p = data[ys] + (3 * xs);
3381                     *(dst++) = *(p++);
3382                     *(dst++) = *(p++);
3383                     *(dst++) = *p;
3384
3385                     if (has_alpha)
3386                         *(alpha_dst++) = *(alpha[ys] + (xs));
3387                 }
3388                 else
3389                 {
3390                     *(dst++) = blank_r;
3391                     *(dst++) = blank_g;
3392                     *(dst++) = blank_b;
3393
3394                     if (has_alpha)
3395                         *(alpha_dst++) = 255;
3396                 }
3397             }
3398         }
3399     }
3400
3401     delete [] data;
3402     delete [] alpha;
3403
3404     return rotated;
3405 }
3406
3407
3408
3409
3410
3411 // A module to allow wxImage initialization/cleanup
3412 // without calling these functions from app.cpp or from
3413 // the user's application.
3414
3415 class wxImageModule: public wxModule
3416 {
3417 DECLARE_DYNAMIC_CLASS(wxImageModule)
3418 public:
3419     wxImageModule() {}
3420     bool OnInit() { wxImage::InitStandardHandlers(); return true; }
3421     void OnExit() { wxImage::CleanUpHandlers(); }
3422 };
3423
3424 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
3425
3426
3427 #endif // wxUSE_IMAGE