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 = 0 ;
1072     unsigned char *target_alpha = 0 ;
1073
1074     if (M_IMGDATA->m_hasMask)
1075     {
1076         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1077     }
1078     else
1079     {
1080         source_alpha = M_IMGDATA->m_alpha ;
1081         if ( source_alpha )
1082         {
1083             image.SetAlpha() ;
1084             alpha_data = image.GetAlpha() ;
1085         }
1086     }
1087
1088     long height = M_IMGDATA->m_height;
1089     long width  = M_IMGDATA->m_width;
1090
1091     for (long j = 0; j < height; j++)
1092     {
1093         for (long i = 0; i < width; i++)
1094         {
1095             if (clockwise)
1096             {
1097                 target_data = data + (((i+1)*height) - j - 1)*3;
1098                 if(source_alpha)
1099                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
1100             }
1101             else
1102             {
1103                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
1104                 if(source_alpha)
1105                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
1106             }
1107             memcpy( target_data, source_data, 3 );
1108             source_data += 3;
1109
1110             if(source_alpha)
1111             {
1112                 memcpy( target_alpha, source_alpha, 1 );
1113                 source_alpha += 1;
1114             }
1115         }
1116     }
1117
1118     return image;
1119 }
1120
1121 wxImage wxImage::Mirror( bool horizontally ) const
1122 {
1123     wxImage image;
1124
1125     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1126
1127     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1128
1129     unsigned char *data = image.GetData();
1130     unsigned char *alpha = NULL;
1131
1132     wxCHECK_MSG( data, image, wxT("unable to create image") );
1133
1134     if (M_IMGDATA->m_alpha != NULL) {
1135         image.SetAlpha();
1136         alpha = image.GetAlpha();
1137         wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
1138     }
1139
1140     if (M_IMGDATA->m_hasMask)
1141         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1142
1143     long height = M_IMGDATA->m_height;
1144     long width  = M_IMGDATA->m_width;
1145
1146     unsigned char *source_data = M_IMGDATA->m_data;
1147     unsigned char *target_data;
1148
1149     if (horizontally)
1150     {
1151         for (long j = 0; j < height; j++)
1152         {
1153             data += width*3;
1154             target_data = data-3;
1155             for (long i = 0; i < width; i++)
1156             {
1157                 memcpy( target_data, source_data, 3 );
1158                 source_data += 3;
1159                 target_data -= 3;
1160             }
1161         }
1162
1163         if (alpha != NULL)
1164         {
1165             // src_alpha starts at the first pixel and increases by 1 after each step
1166             // (a step here is the copy of the alpha value of one pixel)
1167             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1168             // dest_alpha starts just beyond the first line, decreases before each step,
1169             // and after each line is finished, increases by 2 widths (skipping the line
1170             // just copied and the line that will be copied next)
1171             unsigned char *dest_alpha = alpha + width;
1172
1173             for (long jj = 0; jj < height; ++jj)
1174             {
1175                 for (long i = 0; i < width; ++i) {
1176                     *(--dest_alpha) = *(src_alpha++); // copy one pixel
1177                 }
1178                 dest_alpha += 2 * width; // advance beyond the end of the next line
1179             }
1180         }
1181     }
1182     else
1183     {
1184         for (long i = 0; i < height; i++)
1185         {
1186             target_data = data + 3*width*(height-1-i);
1187             memcpy( target_data, source_data, (size_t)3*width );
1188             source_data += 3*width;
1189         }
1190
1191         if (alpha != NULL)
1192         {
1193             // src_alpha starts at the first pixel and increases by 1 width after each step
1194             // (a step here is the copy of the alpha channel of an entire line)
1195             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1196             // dest_alpha starts just beyond the last line (beyond the whole image)
1197             // and decreases by 1 width before each step
1198             unsigned char *dest_alpha = alpha + width * height;
1199
1200             for (long jj = 0; jj < height; ++jj)
1201             {
1202                 dest_alpha -= width;
1203                 memcpy( dest_alpha, src_alpha, (size_t)width );
1204                 src_alpha += width;
1205             }
1206         }
1207     }
1208
1209     return image;
1210 }
1211
1212 wxImage wxImage::GetSubImage( const wxRect &rect ) const
1213 {
1214     wxImage image;
1215
1216     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1217
1218     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
1219                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
1220                  image, wxT("invalid subimage size") );
1221
1222     const int subwidth = rect.GetWidth();
1223     const int subheight = rect.GetHeight();
1224
1225     image.Create( subwidth, subheight, false );
1226
1227     const unsigned char *src_data = GetData();
1228     const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1229     unsigned char *subdata = image.GetData();
1230     unsigned char *subalpha = NULL;
1231
1232     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
1233
1234     if (src_alpha != NULL) {
1235         image.SetAlpha();
1236         subalpha = image.GetAlpha();
1237         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
1238     }
1239
1240     if (M_IMGDATA->m_hasMask)
1241         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1242
1243     const int width = GetWidth();
1244     const int pixsoff = rect.GetLeft() + width * rect.GetTop();
1245
1246     src_data += 3 * pixsoff;
1247     src_alpha += pixsoff; // won't be used if was NULL, so this is ok
1248
1249     for (long j = 0; j < subheight; ++j)
1250     {
1251         memcpy( subdata, src_data, 3 * subwidth );
1252         subdata += 3 * subwidth;
1253         src_data += 3 * width;
1254         if (subalpha != NULL) {
1255             memcpy( subalpha, src_alpha, subwidth );
1256             subalpha += subwidth;
1257             src_alpha += width;
1258         }
1259     }
1260
1261     return image;
1262 }
1263
1264 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
1265                        int r_, int g_, int b_ ) const
1266 {
1267     wxImage image;
1268
1269     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1270     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
1271
1272     int width = GetWidth(), height = GetHeight();
1273     image.Create(size.GetWidth(), size.GetHeight(), false);
1274
1275     unsigned char r = (unsigned char)r_;
1276     unsigned char g = (unsigned char)g_;
1277     unsigned char b = (unsigned char)b_;
1278     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
1279     {
1280         GetOrFindMaskColour( &r, &g, &b );
1281         image.SetMaskColour(r, g, b);
1282     }
1283
1284     image.SetRGB(wxRect(), r, g, b);
1285
1286     // we have two coordinate systems:
1287     // source:     starting at 0,0 of source image
1288     // destination starting at 0,0 of destination image
1289     // Documentation says:
1290     // "The image is pasted into a new image [...] at the position pos relative
1291     // to the upper left of the new image." this means the transition rule is:
1292     // "dest coord" = "source coord" + pos;
1293
1294     // calculate the intersection using source coordinates:
1295     wxRect srcRect(0, 0, width, height);
1296     wxRect dstRect(-pos, size);
1297
1298     srcRect.Intersect(dstRect);
1299
1300     if (!srcRect.IsEmpty())
1301     {
1302         // insertion point is needed in destination coordinates.
1303         // NB: it is not always "pos"!
1304         wxPoint ptInsert = srcRect.GetTopLeft() + pos;
1305
1306         if ((srcRect.GetWidth() == width) && (srcRect.GetHeight() == height))
1307             image.Paste(*this, ptInsert.x, ptInsert.y);
1308         else
1309             image.Paste(GetSubImage(srcRect), ptInsert.x, ptInsert.y);
1310     }
1311
1312     return image;
1313 }
1314
1315 void wxImage::Paste( const wxImage &image, int x, int y )
1316 {
1317     wxCHECK_RET( Ok(), wxT("invalid image") );
1318     wxCHECK_RET( image.Ok(), wxT("invalid image") );
1319
1320     AllocExclusive();
1321
1322     int xx = 0;
1323     int yy = 0;
1324     int width = image.GetWidth();
1325     int height = image.GetHeight();
1326
1327     if (x < 0)
1328     {
1329         xx = -x;
1330         width += x;
1331     }
1332     if (y < 0)
1333     {
1334         yy = -y;
1335         height += y;
1336     }
1337
1338     if ((x+xx)+width > M_IMGDATA->m_width)
1339         width = M_IMGDATA->m_width - (x+xx);
1340     if ((y+yy)+height > M_IMGDATA->m_height)
1341         height = M_IMGDATA->m_height - (y+yy);
1342
1343     if (width < 1) return;
1344     if (height < 1) return;
1345
1346     if ((!HasMask() && !image.HasMask()) ||
1347         (HasMask() && !image.HasMask()) ||
1348        ((HasMask() && image.HasMask() &&
1349          (GetMaskRed()==image.GetMaskRed()) &&
1350          (GetMaskGreen()==image.GetMaskGreen()) &&
1351          (GetMaskBlue()==image.GetMaskBlue()))))
1352     {
1353         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1354         int source_step = image.GetWidth()*3;
1355
1356         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1357         int target_step = M_IMGDATA->m_width*3;
1358         for (int j = 0; j < height; j++)
1359         {
1360             memcpy( target_data, source_data, width*3 );
1361             source_data += source_step;
1362             target_data += target_step;
1363         }
1364     }
1365
1366     // Copy over the alpha channel from the original image
1367     if ( image.HasAlpha() )
1368     {
1369         if ( !HasAlpha() )
1370             InitAlpha();
1371
1372         unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
1373         int source_step = image.GetWidth();
1374
1375         unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
1376         int target_step = M_IMGDATA->m_width;
1377
1378         for (int j = 0; j < height; j++,
1379                                     source_data += source_step,
1380                                     target_data += target_step)
1381         {
1382             memcpy( target_data, source_data, width );
1383         }
1384     }
1385
1386     if (!HasMask() && image.HasMask())
1387     {
1388         unsigned char r = image.GetMaskRed();
1389         unsigned char g = image.GetMaskGreen();
1390         unsigned char b = image.GetMaskBlue();
1391
1392         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1393         int source_step = image.GetWidth()*3;
1394
1395         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1396         int target_step = M_IMGDATA->m_width*3;
1397
1398         for (int j = 0; j < height; j++)
1399         {
1400             for (int i = 0; i < width*3; i+=3)
1401             {
1402                 if ((source_data[i]   != r) ||
1403                     (source_data[i+1] != g) ||
1404                     (source_data[i+2] != b))
1405                 {
1406                     memcpy( target_data+i, source_data+i, 3 );
1407                 }
1408             }
1409             source_data += source_step;
1410             target_data += target_step;
1411         }
1412     }
1413 }
1414
1415 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
1416                        unsigned char r2, unsigned char g2, unsigned char b2 )
1417 {
1418     wxCHECK_RET( Ok(), wxT("invalid image") );
1419
1420     AllocExclusive();
1421
1422     unsigned char *data = GetData();
1423
1424     const int w = GetWidth();
1425     const int h = GetHeight();
1426
1427     for (int j = 0; j < h; j++)
1428         for (int i = 0; i < w; i++)
1429         {
1430             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
1431             {
1432                 data[0] = r2;
1433                 data[1] = g2;
1434                 data[2] = b2;
1435             }
1436             data += 3;
1437         }
1438 }
1439
1440 wxImage wxImage::ConvertToGreyscale(void) const
1441 {
1442     return ConvertToGreyscale(0.299, 0.587, 0.114);
1443 }
1444
1445 wxImage wxImage::ConvertToGreyscale(double weight_r, double weight_g, double weight_b) const
1446 {
1447     wxImage image;
1448
1449     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1450
1451     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1452
1453     unsigned char *dest = image.GetData();
1454
1455     wxCHECK_MSG( dest, image, wxT("unable to create image") );
1456
1457     unsigned char *src = M_IMGDATA->m_data;
1458     bool hasMask = M_IMGDATA->m_hasMask;
1459     unsigned char maskRed = M_IMGDATA->m_maskRed;
1460     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
1461     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
1462
1463     if ( hasMask )
1464         image.SetMaskColour(maskRed, maskGreen, maskBlue);
1465
1466     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
1467     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
1468     {
1469         memcpy(dest, src, 3);
1470         // don't modify the mask
1471         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
1472         {
1473         }
1474         else
1475         {
1476             wxColour::MakeGrey(dest + 0, dest + 1, dest + 2, weight_r, weight_g, weight_b);
1477         }
1478     }
1479
1480     // copy the alpha channel, if any
1481     if (HasAlpha())
1482     {
1483         const size_t alphaSize = GetWidth() * GetHeight();
1484         unsigned char *alpha = (unsigned char*)malloc(alphaSize);
1485         memcpy(alpha, GetAlpha(), alphaSize);
1486         image.InitAlpha();
1487         image.SetAlpha(alpha);
1488     }
1489
1490     return image;
1491 }
1492
1493 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
1494 {
1495     wxImage image;
1496
1497     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1498
1499     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1500
1501     unsigned char *data = image.GetData();
1502
1503     wxCHECK_MSG( data, image, wxT("unable to create image") );
1504
1505     if (M_IMGDATA->m_hasMask)
1506     {
1507         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
1508                                          M_IMGDATA->m_maskBlue == b)
1509             image.SetMaskColour( 255, 255, 255 );
1510         else
1511             image.SetMaskColour( 0, 0, 0 );
1512     }
1513
1514     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
1515
1516     unsigned char *srcd = M_IMGDATA->m_data;
1517     unsigned char *tard = image.GetData();
1518
1519     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
1520     {
1521         bool on = (srcd[0] == r) && (srcd[1] == g) && (srcd[2] == b);
1522         wxColourBase::MakeMono(tard + 0, tard + 1, tard + 2, on);
1523     }
1524
1525     return image;
1526 }
1527
1528 wxImage wxImage::ConvertToDisabled(unsigned char brightness) const
1529 {
1530     wxImage image = *this;
1531
1532     unsigned char mr = image.GetMaskRed();
1533     unsigned char mg = image.GetMaskGreen();
1534     unsigned char mb = image.GetMaskBlue();
1535
1536     int width = image.GetWidth();
1537     int height = image.GetHeight();
1538     bool has_mask = image.HasMask();
1539
1540     for (int y = height-1; y >= 0; --y)
1541     {
1542         for (int x = width-1; x >= 0; --x)
1543         {
1544             unsigned char* data = image.GetData() + (y*(width*3))+(x*3);
1545             unsigned char* r = data;
1546             unsigned char* g = data+1;
1547             unsigned char* b = data+2;
1548
1549             if (has_mask && (*r == mr) && (*g == mg) && (*b == mb))
1550                 continue;
1551
1552             wxColour::MakeDisabled(r, g, b, brightness);
1553         }
1554     }
1555     return image;
1556 }
1557
1558 int wxImage::GetWidth() const
1559 {
1560     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1561
1562     return M_IMGDATA->m_width;
1563 }
1564
1565 int wxImage::GetHeight() const
1566 {
1567     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1568
1569     return M_IMGDATA->m_height;
1570 }
1571
1572 wxBitmapType wxImage::GetType() const
1573 {
1574     wxCHECK_MSG( IsOk(), wxBITMAP_TYPE_INVALID, wxT("invalid image") );
1575
1576     return M_IMGDATA->m_type;
1577 }
1578
1579 void wxImage::SetType(wxBitmapType type)
1580 {
1581     wxCHECK_RET( IsOk(), "must create the image before setting its type");
1582
1583     // type can be wxBITMAP_TYPE_INVALID to reset the image type to default
1584     wxASSERT_MSG( type != wxBITMAP_TYPE_MAX, "invalid bitmap type" );
1585
1586     M_IMGDATA->m_type = type;
1587 }
1588
1589 long wxImage::XYToIndex(int x, int y) const
1590 {
1591     if ( Ok() &&
1592             x >= 0 && y >= 0 &&
1593                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
1594     {
1595         return y*M_IMGDATA->m_width + x;
1596     }
1597
1598     return -1;
1599 }
1600
1601 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
1602 {
1603     long pos = XYToIndex(x, y);
1604     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1605
1606     AllocExclusive();
1607
1608     pos *= 3;
1609
1610     M_IMGDATA->m_data[ pos   ] = r;
1611     M_IMGDATA->m_data[ pos+1 ] = g;
1612     M_IMGDATA->m_data[ pos+2 ] = b;
1613 }
1614
1615 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
1616 {
1617     wxCHECK_RET( Ok(), wxT("invalid image") );
1618
1619     AllocExclusive();
1620
1621     wxRect rect(rect_);
1622     wxRect imageRect(0, 0, GetWidth(), GetHeight());
1623     if ( rect == wxRect() )
1624     {
1625         rect = imageRect;
1626     }
1627     else
1628     {
1629         wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
1630                      imageRect.Contains(rect.GetBottomRight()),
1631                      wxT("invalid bounding rectangle") );
1632     }
1633
1634     int x1 = rect.GetLeft(),
1635         y1 = rect.GetTop(),
1636         x2 = rect.GetRight() + 1,
1637         y2 = rect.GetBottom() + 1;
1638
1639     unsigned char *data wxDUMMY_INITIALIZE(NULL);
1640     int x, y, width = GetWidth();
1641     for (y = y1; y < y2; y++)
1642     {
1643         data = M_IMGDATA->m_data + (y*width + x1)*3;
1644         for (x = x1; x < x2; x++)
1645         {
1646             *data++ = r;
1647             *data++ = g;
1648             *data++ = b;
1649         }
1650     }
1651 }
1652
1653 unsigned char wxImage::GetRed( int x, int y ) const
1654 {
1655     long pos = XYToIndex(x, y);
1656     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1657
1658     pos *= 3;
1659
1660     return M_IMGDATA->m_data[pos];
1661 }
1662
1663 unsigned char wxImage::GetGreen( int x, int y ) const
1664 {
1665     long pos = XYToIndex(x, y);
1666     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1667
1668     pos *= 3;
1669
1670     return M_IMGDATA->m_data[pos+1];
1671 }
1672
1673 unsigned char wxImage::GetBlue( int x, int y ) const
1674 {
1675     long pos = XYToIndex(x, y);
1676     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1677
1678     pos *= 3;
1679
1680     return M_IMGDATA->m_data[pos+2];
1681 }
1682
1683 bool wxImage::IsOk() const
1684 {
1685     // image of 0 width or height can't be considered ok - at least because it
1686     // causes crashes in ConvertToBitmap() if we don't catch it in time
1687     wxImageRefData *data = M_IMGDATA;
1688     return data && data->m_ok && data->m_width && data->m_height;
1689 }
1690
1691 unsigned char *wxImage::GetData() const
1692 {
1693     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1694
1695     return M_IMGDATA->m_data;
1696 }
1697
1698 void wxImage::SetData( unsigned char *data, bool static_data  )
1699 {
1700     wxCHECK_RET( Ok(), wxT("invalid image") );
1701
1702     wxImageRefData *newRefData = new wxImageRefData();
1703
1704     newRefData->m_width = M_IMGDATA->m_width;
1705     newRefData->m_height = M_IMGDATA->m_height;
1706     newRefData->m_data = data;
1707     newRefData->m_ok = true;
1708     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1709     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1710     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1711     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1712     newRefData->m_static = static_data;
1713
1714     UnRef();
1715
1716     m_refData = newRefData;
1717 }
1718
1719 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1720 {
1721     wxImageRefData *newRefData = new wxImageRefData();
1722
1723     if (m_refData)
1724     {
1725         newRefData->m_width = new_width;
1726         newRefData->m_height = new_height;
1727         newRefData->m_data = data;
1728         newRefData->m_ok = true;
1729         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1730         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1731         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1732         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1733     }
1734     else
1735     {
1736         newRefData->m_width = new_width;
1737         newRefData->m_height = new_height;
1738         newRefData->m_data = data;
1739         newRefData->m_ok = true;
1740     }
1741     newRefData->m_static = static_data;
1742
1743     UnRef();
1744
1745     m_refData = newRefData;
1746 }
1747
1748 // ----------------------------------------------------------------------------
1749 // alpha channel support
1750 // ----------------------------------------------------------------------------
1751
1752 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1753 {
1754     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1755
1756     long pos = XYToIndex(x, y);
1757     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1758
1759     AllocExclusive();
1760
1761     M_IMGDATA->m_alpha[pos] = alpha;
1762 }
1763
1764 unsigned char wxImage::GetAlpha(int x, int y) const
1765 {
1766     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1767
1768     long pos = XYToIndex(x, y);
1769     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1770
1771     return M_IMGDATA->m_alpha[pos];
1772 }
1773
1774 bool
1775 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1776 {
1777     SetAlpha(NULL);
1778
1779     const int w = M_IMGDATA->m_width;
1780     const int h = M_IMGDATA->m_height;
1781
1782     unsigned char *alpha = GetAlpha();
1783     unsigned char *data = GetData();
1784
1785     for ( int y = 0; y < h; y++ )
1786     {
1787         for ( int x = 0; x < w; x++ )
1788         {
1789             *alpha++ = *data;
1790             *data++ = r;
1791             *data++ = g;
1792             *data++ = b;
1793         }
1794     }
1795
1796     return true;
1797 }
1798
1799 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1800 {
1801     wxCHECK_RET( Ok(), wxT("invalid image") );
1802
1803     AllocExclusive();
1804
1805     if ( !alpha )
1806     {
1807         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1808     }
1809
1810     if( !M_IMGDATA->m_staticAlpha )
1811         free(M_IMGDATA->m_alpha);
1812
1813     M_IMGDATA->m_alpha = alpha;
1814     M_IMGDATA->m_staticAlpha = static_data;
1815 }
1816
1817 unsigned char *wxImage::GetAlpha() const
1818 {
1819     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1820
1821     return M_IMGDATA->m_alpha;
1822 }
1823
1824 void wxImage::InitAlpha()
1825 {
1826     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1827
1828     // initialize memory for alpha channel
1829     SetAlpha();
1830
1831     unsigned char *alpha = M_IMGDATA->m_alpha;
1832     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1833
1834     if ( HasMask() )
1835     {
1836         // use the mask to initialize the alpha channel.
1837         const unsigned char * const alphaEnd = alpha + lenAlpha;
1838
1839         const unsigned char mr = M_IMGDATA->m_maskRed;
1840         const unsigned char mg = M_IMGDATA->m_maskGreen;
1841         const unsigned char mb = M_IMGDATA->m_maskBlue;
1842         for ( unsigned char *src = M_IMGDATA->m_data;
1843               alpha < alphaEnd;
1844               src += 3, alpha++ )
1845         {
1846             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1847                             ? wxIMAGE_ALPHA_TRANSPARENT
1848                             : wxIMAGE_ALPHA_OPAQUE;
1849         }
1850
1851         M_IMGDATA->m_hasMask = false;
1852     }
1853     else // no mask
1854     {
1855         // make the image fully opaque
1856         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1857     }
1858 }
1859
1860 void wxImage::ClearAlpha()
1861 {
1862     wxCHECK_RET( HasAlpha(), wxT("image already doesn't have an alpha channel") );
1863
1864     if ( !M_IMGDATA->m_staticAlpha )
1865         free( M_IMGDATA->m_alpha );
1866
1867     M_IMGDATA->m_alpha = NULL;
1868 }
1869
1870
1871 // ----------------------------------------------------------------------------
1872 // mask support
1873 // ----------------------------------------------------------------------------
1874
1875 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1876 {
1877     wxCHECK_RET( Ok(), wxT("invalid image") );
1878
1879     AllocExclusive();
1880
1881     M_IMGDATA->m_maskRed = r;
1882     M_IMGDATA->m_maskGreen = g;
1883     M_IMGDATA->m_maskBlue = b;
1884     M_IMGDATA->m_hasMask = true;
1885 }
1886
1887 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1888 {
1889     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1890
1891     if (M_IMGDATA->m_hasMask)
1892     {
1893         if (r) *r = M_IMGDATA->m_maskRed;
1894         if (g) *g = M_IMGDATA->m_maskGreen;
1895         if (b) *b = M_IMGDATA->m_maskBlue;
1896         return true;
1897     }
1898     else
1899     {
1900         FindFirstUnusedColour(r, g, b);
1901         return false;
1902     }
1903 }
1904
1905 unsigned char wxImage::GetMaskRed() const
1906 {
1907     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1908
1909     return M_IMGDATA->m_maskRed;
1910 }
1911
1912 unsigned char wxImage::GetMaskGreen() const
1913 {
1914     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1915
1916     return M_IMGDATA->m_maskGreen;
1917 }
1918
1919 unsigned char wxImage::GetMaskBlue() const
1920 {
1921     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1922
1923     return M_IMGDATA->m_maskBlue;
1924 }
1925
1926 void wxImage::SetMask( bool mask )
1927 {
1928     wxCHECK_RET( Ok(), wxT("invalid image") );
1929
1930     AllocExclusive();
1931
1932     M_IMGDATA->m_hasMask = mask;
1933 }
1934
1935 bool wxImage::HasMask() const
1936 {
1937     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1938
1939     return M_IMGDATA->m_hasMask;
1940 }
1941
1942 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1943 {
1944     long pos = XYToIndex(x, y);
1945     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1946
1947     // check mask
1948     if ( M_IMGDATA->m_hasMask )
1949     {
1950         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1951         if ( p[0] == M_IMGDATA->m_maskRed &&
1952                 p[1] == M_IMGDATA->m_maskGreen &&
1953                     p[2] == M_IMGDATA->m_maskBlue )
1954         {
1955             return true;
1956         }
1957     }
1958
1959     // then check alpha
1960     if ( M_IMGDATA->m_alpha )
1961     {
1962         if ( M_IMGDATA->m_alpha[pos] < threshold )
1963         {
1964             // transparent enough
1965             return true;
1966         }
1967     }
1968
1969     // not transparent
1970     return false;
1971 }
1972
1973 bool wxImage::SetMaskFromImage(const wxImage& mask,
1974                                unsigned char mr, unsigned char mg, unsigned char mb)
1975 {
1976     // check that the images are the same size
1977     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1978     {
1979         wxLogError( _("Image and mask have different sizes.") );
1980         return false;
1981     }
1982
1983     // find unused colour
1984     unsigned char r,g,b ;
1985     if (!FindFirstUnusedColour(&r, &g, &b))
1986     {
1987         wxLogError( _("No unused colour in image being masked.") );
1988         return false ;
1989     }
1990
1991     AllocExclusive();
1992
1993     unsigned char *imgdata = GetData();
1994     unsigned char *maskdata = mask.GetData();
1995
1996     const int w = GetWidth();
1997     const int h = GetHeight();
1998
1999     for (int j = 0; j < h; j++)
2000     {
2001         for (int i = 0; i < w; i++)
2002         {
2003             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
2004             {
2005                 imgdata[0] = r;
2006                 imgdata[1] = g;
2007                 imgdata[2] = b;
2008             }
2009             imgdata  += 3;
2010             maskdata += 3;
2011         }
2012     }
2013
2014     SetMaskColour(r, g, b);
2015     SetMask(true);
2016
2017     return true;
2018 }
2019
2020 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
2021 {
2022     if ( !HasAlpha() )
2023         return true;
2024
2025     unsigned char mr, mg, mb;
2026     if ( !FindFirstUnusedColour(&mr, &mg, &mb) )
2027     {
2028         wxLogError( _("No unused colour in image being masked.") );
2029         return false;
2030     }
2031
2032     ConvertAlphaToMask(mr, mg, mb, threshold);
2033     return true;
2034 }
2035
2036 void wxImage::ConvertAlphaToMask(unsigned char mr,
2037                                  unsigned char mg,
2038                                  unsigned char mb,
2039                                  unsigned char threshold)
2040 {
2041     if ( !HasAlpha() )
2042         return;
2043
2044     AllocExclusive();
2045
2046     SetMask(true);
2047     SetMaskColour(mr, mg, mb);
2048
2049     unsigned char *imgdata = GetData();
2050     unsigned char *alphadata = GetAlpha();
2051
2052     int w = GetWidth();
2053     int h = GetHeight();
2054
2055     for (int y = 0; y < h; y++)
2056     {
2057         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
2058         {
2059             if (*alphadata < threshold)
2060             {
2061                 imgdata[0] = mr;
2062                 imgdata[1] = mg;
2063                 imgdata[2] = mb;
2064             }
2065         }
2066     }
2067
2068     if ( !M_IMGDATA->m_staticAlpha )
2069         free(M_IMGDATA->m_alpha);
2070
2071     M_IMGDATA->m_alpha = NULL;
2072     M_IMGDATA->m_staticAlpha = false;
2073 }
2074
2075 // ----------------------------------------------------------------------------
2076 // Palette functions
2077 // ----------------------------------------------------------------------------
2078
2079 #if wxUSE_PALETTE
2080
2081 bool wxImage::HasPalette() const
2082 {
2083     if (!Ok())
2084         return false;
2085
2086     return M_IMGDATA->m_palette.Ok();
2087 }
2088
2089 const wxPalette& wxImage::GetPalette() const
2090 {
2091     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
2092
2093     return M_IMGDATA->m_palette;
2094 }
2095
2096 void wxImage::SetPalette(const wxPalette& palette)
2097 {
2098     wxCHECK_RET( Ok(), wxT("invalid image") );
2099
2100     AllocExclusive();
2101
2102     M_IMGDATA->m_palette = palette;
2103 }
2104
2105 #endif // wxUSE_PALETTE
2106
2107 // ----------------------------------------------------------------------------
2108 // Option functions (arbitrary name/value mapping)
2109 // ----------------------------------------------------------------------------
2110
2111 void wxImage::SetOption(const wxString& name, const wxString& value)
2112 {
2113     AllocExclusive();
2114
2115     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2116     if ( idx == wxNOT_FOUND )
2117     {
2118         M_IMGDATA->m_optionNames.Add(name);
2119         M_IMGDATA->m_optionValues.Add(value);
2120     }
2121     else
2122     {
2123         M_IMGDATA->m_optionNames[idx] = name;
2124         M_IMGDATA->m_optionValues[idx] = value;
2125     }
2126 }
2127
2128 void wxImage::SetOption(const wxString& name, int value)
2129 {
2130     wxString valStr;
2131     valStr.Printf(wxT("%d"), value);
2132     SetOption(name, valStr);
2133 }
2134
2135 wxString wxImage::GetOption(const wxString& name) const
2136 {
2137     if ( !M_IMGDATA )
2138         return wxEmptyString;
2139
2140     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2141     if ( idx == wxNOT_FOUND )
2142         return wxEmptyString;
2143     else
2144         return M_IMGDATA->m_optionValues[idx];
2145 }
2146
2147 int wxImage::GetOptionInt(const wxString& name) const
2148 {
2149     return wxAtoi(GetOption(name));
2150 }
2151
2152 bool wxImage::HasOption(const wxString& name) const
2153 {
2154     return M_IMGDATA ? M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND
2155                      : false;
2156 }
2157
2158 // ----------------------------------------------------------------------------
2159 // image I/O
2160 // ----------------------------------------------------------------------------
2161
2162 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2163                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type),
2164                         int WXUNUSED_UNLESS_STREAMS(index) )
2165 {
2166 #if HAS_FILE_STREAMS
2167     if (wxFileExists(filename))
2168     {
2169         wxImageFileInputStream stream(filename);
2170         wxBufferedInputStream bstream( stream );
2171         return LoadFile(bstream, type, index);
2172     }
2173     else
2174     {
2175         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2176
2177         return false;
2178     }
2179 #else // !HAS_FILE_STREAMS
2180     return false;
2181 #endif // HAS_FILE_STREAMS
2182 }
2183
2184 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2185                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
2186                         int WXUNUSED_UNLESS_STREAMS(index) )
2187 {
2188 #if HAS_FILE_STREAMS
2189     if (wxFileExists(filename))
2190     {
2191         wxImageFileInputStream stream(filename);
2192         wxBufferedInputStream bstream( stream );
2193         return LoadFile(bstream, mimetype, index);
2194     }
2195     else
2196     {
2197         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2198
2199         return false;
2200     }
2201 #else // !HAS_FILE_STREAMS
2202     return false;
2203 #endif // HAS_FILE_STREAMS
2204 }
2205
2206
2207 bool wxImage::SaveFile( const wxString& filename ) const
2208 {
2209     wxString ext = filename.AfterLast('.').Lower();
2210
2211     wxImageHandler *handler = FindHandler(ext, wxBITMAP_TYPE_ANY);
2212     if ( !handler)
2213     {
2214        wxLogError(_("Can't save image to file '%s': unknown extension."),
2215                   filename);
2216        return false;
2217     }
2218
2219     return SaveFile(filename, handler->GetType());
2220 }
2221
2222 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2223                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type) ) const
2224 {
2225 #if HAS_FILE_STREAMS
2226     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2227
2228     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2229
2230     wxImageFileOutputStream stream(filename);
2231
2232     if ( stream.IsOk() )
2233     {
2234         wxBufferedOutputStream bstream( stream );
2235         return SaveFile(bstream, type);
2236     }
2237 #endif // HAS_FILE_STREAMS
2238
2239     return false;
2240 }
2241
2242 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2243                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
2244 {
2245 #if HAS_FILE_STREAMS
2246     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2247
2248     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2249
2250     wxImageFileOutputStream stream(filename);
2251
2252     if ( stream.IsOk() )
2253     {
2254         wxBufferedOutputStream bstream( stream );
2255         return SaveFile(bstream, mimetype);
2256     }
2257 #endif // HAS_FILE_STREAMS
2258
2259     return false;
2260 }
2261
2262 bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
2263 {
2264 #if HAS_FILE_STREAMS
2265     wxImageFileInputStream stream(name);
2266     return CanRead(stream);
2267 #else
2268     return false;
2269 #endif
2270 }
2271
2272 int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
2273                             wxBitmapType WXUNUSED_UNLESS_STREAMS(type) )
2274 {
2275 #if HAS_FILE_STREAMS
2276     wxImageFileInputStream stream(name);
2277     if (stream.Ok())
2278         return GetImageCount(stream, type);
2279 #endif
2280
2281   return 0;
2282 }
2283
2284 #if wxUSE_STREAMS
2285
2286 bool wxImage::CanRead( wxInputStream &stream )
2287 {
2288     const wxList& list = GetHandlers();
2289
2290     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2291     {
2292         wxImageHandler *handler=(wxImageHandler*)node->GetData();
2293         if (handler->CanRead( stream ))
2294             return true;
2295     }
2296
2297     return false;
2298 }
2299
2300 int wxImage::GetImageCount( wxInputStream &stream, wxBitmapType type )
2301 {
2302     wxImageHandler *handler;
2303
2304     if ( type == wxBITMAP_TYPE_ANY )
2305     {
2306         const wxList& list = GetHandlers();
2307
2308         for ( wxList::compatibility_iterator node = list.GetFirst();
2309               node;
2310               node = node->GetNext() )
2311         {
2312              handler = (wxImageHandler*)node->GetData();
2313              if ( handler->CanRead(stream) )
2314              {
2315                  const int count = handler->GetImageCount(stream);
2316                  if ( count >= 0 )
2317                      return count;
2318              }
2319
2320         }
2321
2322         wxLogWarning(_("No handler found for image type."));
2323         return 0;
2324     }
2325
2326     handler = FindHandler(type);
2327
2328     if ( !handler )
2329     {
2330         wxLogWarning(_("No image handler for type %d defined."), type);
2331         return false;
2332     }
2333
2334     if ( handler->CanRead(stream) )
2335     {
2336         return handler->GetImageCount(stream);
2337     }
2338     else
2339     {
2340         wxLogError(_("Image file is not of type %d."), type);
2341         return 0;
2342     }
2343 }
2344
2345 bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
2346 {
2347     // save the options values which can be clobbered by the handler (e.g. many
2348     // of them call Destroy() before trying to load the file)
2349     const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
2350                    maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
2351
2352     if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
2353         return false;
2354
2355     // rescale the image to the specified size if needed
2356     if ( maxWidth || maxHeight )
2357     {
2358         const unsigned widthOrig = GetWidth(),
2359                        heightOrig = GetHeight();
2360
2361         // this uses the same (trivial) algorithm as the JPEG handler
2362         unsigned width = widthOrig,
2363                  height = heightOrig;
2364         while ( (maxWidth && width > maxWidth) ||
2365                     (maxHeight && height > maxHeight) )
2366         {
2367             width /= 2;
2368             height /= 2;
2369         }
2370
2371         if ( width != widthOrig || height != heightOrig )
2372             Rescale(width, height, wxIMAGE_QUALITY_HIGH);
2373     }
2374
2375     // Set this after Rescale, which currently does not preserve it
2376     M_IMGDATA->m_type = handler.GetType();
2377
2378     return true;
2379 }
2380
2381 bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
2382 {
2383     AllocExclusive();
2384
2385     wxImageHandler *handler;
2386
2387     if ( type == wxBITMAP_TYPE_ANY )
2388     {
2389         const wxList& list = GetHandlers();
2390         for ( wxList::compatibility_iterator node = list.GetFirst();
2391               node;
2392               node = node->GetNext() )
2393         {
2394              handler = (wxImageHandler*)node->GetData();
2395              if ( handler->CanRead(stream) && DoLoad(*handler, stream, index) )
2396                  return true;
2397         }
2398
2399         wxLogWarning( _("No handler found for image type.") );
2400
2401         return false;
2402     }
2403     //else: have specific type
2404
2405     handler = FindHandler(type);
2406     if ( !handler )
2407     {
2408         wxLogWarning( _("No image handler for type %d defined."), type );
2409         return false;
2410     }
2411
2412     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2413     {
2414         wxLogError(_("Image file is not of type %d."), type);
2415         return false;
2416     }
2417
2418     return DoLoad(*handler, stream, index);
2419 }
2420
2421 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
2422 {
2423     UnRef();
2424
2425     m_refData = new wxImageRefData;
2426
2427     wxImageHandler *handler = FindHandlerMime(mimetype);
2428
2429     if ( !handler )
2430     {
2431         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2432         return false;
2433     }
2434
2435     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2436     {
2437         wxLogError(_("Image file is not of type %s."), mimetype);
2438         return false;
2439     }
2440
2441     return DoLoad(*handler, stream, index);
2442 }
2443
2444 bool wxImage::DoSave(wxImageHandler& handler, wxOutputStream& stream) const
2445 {
2446     wxImage * const self = const_cast<wxImage *>(this);
2447     if ( !handler.SaveFile(self, stream) )
2448         return false;
2449
2450     M_IMGDATA->m_type = handler.GetType();
2451     return true;
2452 }
2453
2454 bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
2455 {
2456     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2457
2458     wxImageHandler *handler = FindHandler(type);
2459     if ( !handler )
2460     {
2461         wxLogWarning( _("No image handler for type %d defined."), type );
2462         return false;
2463     }
2464
2465     return DoSave(*handler, stream);
2466 }
2467
2468 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
2469 {
2470     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2471
2472     wxImageHandler *handler = FindHandlerMime(mimetype);
2473     if ( !handler )
2474     {
2475         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2476     }
2477
2478     return DoSave(*handler, stream);
2479 }
2480
2481 #endif // wxUSE_STREAMS
2482
2483 // ----------------------------------------------------------------------------
2484 // image I/O handlers
2485 // ----------------------------------------------------------------------------
2486
2487 void wxImage::AddHandler( wxImageHandler *handler )
2488 {
2489     // Check for an existing handler of the type being added.
2490     if (FindHandler( handler->GetType() ) == 0)
2491     {
2492         sm_handlers.Append( handler );
2493     }
2494     else
2495     {
2496         // This is not documented behaviour, merely the simplest 'fix'
2497         // for preventing duplicate additions.  If someone ever has
2498         // a good reason to add and remove duplicate handlers (and they
2499         // may) we should probably refcount the duplicates.
2500         //   also an issue in InsertHandler below.
2501
2502         wxLogDebug( wxT("Adding duplicate image handler for '%s'"),
2503                     handler->GetName().c_str() );
2504         delete handler;
2505     }
2506 }
2507
2508 void wxImage::InsertHandler( wxImageHandler *handler )
2509 {
2510     // Check for an existing handler of the type being added.
2511     if (FindHandler( handler->GetType() ) == 0)
2512     {
2513         sm_handlers.Insert( handler );
2514     }
2515     else
2516     {
2517         // see AddHandler for additional comments.
2518         wxLogDebug( wxT("Inserting duplicate image handler for '%s'"),
2519                     handler->GetName().c_str() );
2520         delete handler;
2521     }
2522 }
2523
2524 bool wxImage::RemoveHandler( const wxString& name )
2525 {
2526     wxImageHandler *handler = FindHandler(name);
2527     if (handler)
2528     {
2529         sm_handlers.DeleteObject(handler);
2530         delete handler;
2531         return true;
2532     }
2533     else
2534         return false;
2535 }
2536
2537 wxImageHandler *wxImage::FindHandler( const wxString& name )
2538 {
2539     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2540     while (node)
2541     {
2542         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2543         if (handler->GetName().Cmp(name) == 0) return handler;
2544
2545         node = node->GetNext();
2546     }
2547     return NULL;
2548 }
2549
2550 wxImageHandler *wxImage::FindHandler( const wxString& extension, wxBitmapType bitmapType )
2551 {
2552     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2553     while (node)
2554     {
2555         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2556         if ((bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType))
2557         {
2558             if (handler->GetExtension() == extension)
2559                 return handler;
2560             if (handler->GetAltExtensions().Index(extension, false) != wxNOT_FOUND)
2561                 return handler;
2562         }
2563         node = node->GetNext();
2564     }
2565     return NULL;
2566 }
2567
2568 wxImageHandler *wxImage::FindHandler(wxBitmapType bitmapType )
2569 {
2570     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2571     while (node)
2572     {
2573         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2574         if (handler->GetType() == bitmapType) return handler;
2575         node = node->GetNext();
2576     }
2577     return NULL;
2578 }
2579
2580 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
2581 {
2582     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2583     while (node)
2584     {
2585         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2586         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
2587         node = node->GetNext();
2588     }
2589     return NULL;
2590 }
2591
2592 void wxImage::InitStandardHandlers()
2593 {
2594 #if wxUSE_STREAMS
2595     AddHandler(new wxBMPHandler);
2596 #endif // wxUSE_STREAMS
2597 }
2598
2599 void wxImage::CleanUpHandlers()
2600 {
2601     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2602     while (node)
2603     {
2604         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2605         wxList::compatibility_iterator next = node->GetNext();
2606         delete handler;
2607         node = next;
2608     }
2609
2610     sm_handlers.Clear();
2611 }
2612
2613 wxString wxImage::GetImageExtWildcard()
2614 {
2615     wxString fmts;
2616
2617     wxList& Handlers = wxImage::GetHandlers();
2618     wxList::compatibility_iterator Node = Handlers.GetFirst();
2619     while ( Node )
2620     {
2621         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
2622         fmts += wxT("*.") + Handler->GetExtension();
2623         for (size_t i = 0; i < Handler->GetAltExtensions().size(); i++)
2624             fmts += wxT(";*.") + Handler->GetAltExtensions()[i];
2625         Node = Node->GetNext();
2626         if ( Node ) fmts += wxT(";");
2627     }
2628
2629     return wxT("(") + fmts + wxT(")|") + fmts;
2630 }
2631
2632 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
2633 {
2634     const double red = rgb.red / 255.0,
2635                  green = rgb.green / 255.0,
2636                  blue = rgb.blue / 255.0;
2637
2638     // find the min and max intensity (and remember which one was it for the
2639     // latter)
2640     double minimumRGB = red;
2641     if ( green < minimumRGB )
2642         minimumRGB = green;
2643     if ( blue < minimumRGB )
2644         minimumRGB = blue;
2645
2646     enum { RED, GREEN, BLUE } chMax = RED;
2647     double maximumRGB = red;
2648     if ( green > maximumRGB )
2649     {
2650         chMax = GREEN;
2651         maximumRGB = green;
2652     }
2653     if ( blue > maximumRGB )
2654     {
2655         chMax = BLUE;
2656         maximumRGB = blue;
2657     }
2658
2659     const double value = maximumRGB;
2660
2661     double hue = 0.0, saturation;
2662     const double deltaRGB = maximumRGB - minimumRGB;
2663     if ( wxIsNullDouble(deltaRGB) )
2664     {
2665         // Gray has no color
2666         hue = 0.0;
2667         saturation = 0.0;
2668     }
2669     else
2670     {
2671         switch ( chMax )
2672         {
2673             case RED:
2674                 hue = (green - blue) / deltaRGB;
2675                 break;
2676
2677             case GREEN:
2678                 hue = 2.0 + (blue - red) / deltaRGB;
2679                 break;
2680
2681             case BLUE:
2682                 hue = 4.0 + (red - green) / deltaRGB;
2683                 break;
2684
2685             default:
2686                 wxFAIL_MSG(wxT("hue not specified"));
2687                 break;
2688         }
2689
2690         hue /= 6.0;
2691
2692         if ( hue < 0.0 )
2693             hue += 1.0;
2694
2695         saturation = deltaRGB / maximumRGB;
2696     }
2697
2698     return HSVValue(hue, saturation, value);
2699 }
2700
2701 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
2702 {
2703     double red, green, blue;
2704
2705     if ( wxIsNullDouble(hsv.saturation) )
2706     {
2707         // Grey
2708         red = hsv.value;
2709         green = hsv.value;
2710         blue = hsv.value;
2711     }
2712     else // not grey
2713     {
2714         double hue = hsv.hue * 6.0;      // sector 0 to 5
2715         int i = (int)floor(hue);
2716         double f = hue - i;          // fractional part of h
2717         double p = hsv.value * (1.0 - hsv.saturation);
2718
2719         switch (i)
2720         {
2721             case 0:
2722                 red = hsv.value;
2723                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2724                 blue = p;
2725                 break;
2726
2727             case 1:
2728                 red = hsv.value * (1.0 - hsv.saturation * f);
2729                 green = hsv.value;
2730                 blue = p;
2731                 break;
2732
2733             case 2:
2734                 red = p;
2735                 green = hsv.value;
2736                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2737                 break;
2738
2739             case 3:
2740                 red = p;
2741                 green = hsv.value * (1.0 - hsv.saturation * f);
2742                 blue = hsv.value;
2743                 break;
2744
2745             case 4:
2746                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2747                 green = p;
2748                 blue = hsv.value;
2749                 break;
2750
2751             default:    // case 5:
2752                 red = hsv.value;
2753                 green = p;
2754                 blue = hsv.value * (1.0 - hsv.saturation * f);
2755                 break;
2756         }
2757     }
2758
2759     return RGBValue((unsigned char)(red * 255.0),
2760                     (unsigned char)(green * 255.0),
2761                     (unsigned char)(blue * 255.0));
2762 }
2763
2764 /*
2765  * Rotates the hue of each pixel of the image. angle is a double in the range
2766  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2767  */
2768 void wxImage::RotateHue(double angle)
2769 {
2770     AllocExclusive();
2771
2772     unsigned char *srcBytePtr;
2773     unsigned char *dstBytePtr;
2774     unsigned long count;
2775     wxImage::HSVValue hsv;
2776     wxImage::RGBValue rgb;
2777
2778     wxASSERT (angle >= -1.0 && angle <= 1.0);
2779     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2780     if ( count > 0 && !wxIsNullDouble(angle) )
2781     {
2782         srcBytePtr = M_IMGDATA->m_data;
2783         dstBytePtr = srcBytePtr;
2784         do
2785         {
2786             rgb.red = *srcBytePtr++;
2787             rgb.green = *srcBytePtr++;
2788             rgb.blue = *srcBytePtr++;
2789             hsv = RGBtoHSV(rgb);
2790
2791             hsv.hue = hsv.hue + angle;
2792             if (hsv.hue > 1.0)
2793                 hsv.hue = hsv.hue - 1.0;
2794             else if (hsv.hue < 0.0)
2795                 hsv.hue = hsv.hue + 1.0;
2796
2797             rgb = HSVtoRGB(hsv);
2798             *dstBytePtr++ = rgb.red;
2799             *dstBytePtr++ = rgb.green;
2800             *dstBytePtr++ = rgb.blue;
2801         } while (--count != 0);
2802     }
2803 }
2804
2805 //-----------------------------------------------------------------------------
2806 // wxImageHandler
2807 //-----------------------------------------------------------------------------
2808
2809 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2810
2811 #if wxUSE_STREAMS
2812 int wxImageHandler::GetImageCount( wxInputStream& stream )
2813 {
2814     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2815     //       wxImageHandler::CallDoCanRead
2816
2817     if ( !stream.IsSeekable() )
2818         return false;        // can't test unseekable stream
2819
2820     wxFileOffset posOld = stream.TellI();
2821     int n = DoGetImageCount(stream);
2822
2823     // restore the old position to be able to test other formats and so on
2824     if ( stream.SeekI(posOld) == wxInvalidOffset )
2825     {
2826         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2827
2828         // reading would fail anyhow as we're not at the right position
2829         return false;
2830     }
2831
2832     return n;
2833 }
2834
2835 bool wxImageHandler::CanRead( const wxString& name )
2836 {
2837     if (wxFileExists(name))
2838     {
2839         wxImageFileInputStream stream(name);
2840         return CanRead(stream);
2841     }
2842
2843     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2844
2845     return false;
2846 }
2847
2848 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2849 {
2850     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2851     //       wxImageHandler::GetImageCount
2852
2853     if ( !stream.IsSeekable() )
2854         return false;        // can't test unseekable stream
2855
2856     wxFileOffset posOld = stream.TellI();
2857     bool ok = DoCanRead(stream);
2858
2859     // restore the old position to be able to test other formats and so on
2860     if ( stream.SeekI(posOld) == wxInvalidOffset )
2861     {
2862         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2863
2864         // reading would fail anyhow as we're not at the right position
2865         return false;
2866     }
2867
2868     return ok;
2869 }
2870
2871 #endif // wxUSE_STREAMS
2872
2873 /* static */
2874 wxImageResolution
2875 wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
2876 {
2877     wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, wxT("NULL pointer") );
2878
2879     if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
2880          image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
2881     {
2882         *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
2883         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
2884     }
2885     else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) )
2886     {
2887         *x =
2888         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
2889     }
2890     else // no resolution options specified
2891     {
2892         *x =
2893         *y = 0;
2894
2895         return wxIMAGE_RESOLUTION_NONE;
2896     }
2897
2898     // get the resolution unit too
2899     int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
2900     if ( !resUnit )
2901     {
2902         // this is the default
2903         resUnit = wxIMAGE_RESOLUTION_INCHES;
2904     }
2905
2906     return (wxImageResolution)resUnit;
2907 }
2908
2909 // ----------------------------------------------------------------------------
2910 // image histogram stuff
2911 // ----------------------------------------------------------------------------
2912
2913 bool
2914 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2915                                         unsigned char *g,
2916                                         unsigned char *b,
2917                                         unsigned char r2,
2918                                         unsigned char b2,
2919                                         unsigned char g2) const
2920 {
2921     unsigned long key = MakeKey(r2, g2, b2);
2922
2923     while ( find(key) != end() )
2924     {
2925         // color already used
2926         r2++;
2927         if ( r2 >= 255 )
2928         {
2929             r2 = 0;
2930             g2++;
2931             if ( g2 >= 255 )
2932             {
2933                 g2 = 0;
2934                 b2++;
2935                 if ( b2 >= 255 )
2936                 {
2937                     wxLogError(_("No unused colour in image.") );
2938                     return false;
2939                 }
2940             }
2941         }
2942
2943         key = MakeKey(r2, g2, b2);
2944     }
2945
2946     if ( r )
2947         *r = r2;
2948     if ( g )
2949         *g = g2;
2950     if ( b )
2951         *b = b2;
2952
2953     return true;
2954 }
2955
2956 bool
2957 wxImage::FindFirstUnusedColour(unsigned char *r,
2958                                unsigned char *g,
2959                                unsigned char *b,
2960                                unsigned char r2,
2961                                unsigned char b2,
2962                                unsigned char g2) const
2963 {
2964     wxImageHistogram histogram;
2965
2966     ComputeHistogram(histogram);
2967
2968     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2969 }
2970
2971
2972
2973 // GRG, Dic/99
2974 // Counts and returns the number of different colours. Optionally stops
2975 // when it exceeds 'stopafter' different colours. This is useful, for
2976 // example, to see if the image can be saved as 8-bit (256 colour or
2977 // less, in this case it would be invoked as CountColours(256)). Default
2978 // value for stopafter is -1 (don't care).
2979 //
2980 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2981 {
2982     wxHashTable h;
2983     wxObject dummy;
2984     unsigned char r, g, b;
2985     unsigned char *p;
2986     unsigned long size, nentries, key;
2987
2988     p = GetData();
2989     size = GetWidth() * GetHeight();
2990     nentries = 0;
2991
2992     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2993     {
2994         r = *(p++);
2995         g = *(p++);
2996         b = *(p++);
2997         key = wxImageHistogram::MakeKey(r, g, b);
2998
2999         if (h.Get(key) == NULL)
3000         {
3001             h.Put(key, &dummy);
3002             nentries++;
3003         }
3004     }
3005
3006     return nentries;
3007 }
3008
3009
3010 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
3011 {
3012     unsigned char *p = GetData();
3013     unsigned long nentries = 0;
3014
3015     h.clear();
3016
3017     const unsigned long size = GetWidth() * GetHeight();
3018
3019     unsigned char r, g, b;
3020     for ( unsigned long n = 0; n < size; n++ )
3021     {
3022         r = *p++;
3023         g = *p++;
3024         b = *p++;
3025
3026         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
3027
3028         if ( entry.value++ == 0 )
3029             entry.index = nentries++;
3030     }
3031
3032     return nentries;
3033 }
3034
3035 /*
3036  * Rotation code by Carlos Moreno
3037  */
3038
3039 static const double wxROTATE_EPSILON = 1e-10;
3040
3041 // Auxiliary function to rotate a point (x,y) with respect to point p0
3042 // make it inline and use a straight return to facilitate optimization
3043 // also, the function receives the sine and cosine of the angle to avoid
3044 // repeating the time-consuming calls to these functions -- sin/cos can
3045 // be computed and stored in the calling function.
3046
3047 static inline wxRealPoint
3048 wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
3049               const wxRealPoint& p0)
3050 {
3051     return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
3052                        p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
3053 }
3054
3055 static inline wxRealPoint
3056 wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
3057               const wxRealPoint & p0)
3058 {
3059     return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
3060 }
3061
3062 wxImage wxImage::Rotate(double angle,
3063                         const wxPoint& centre_of_rotation,
3064                         bool interpolating,
3065                         wxPoint *offset_after_rotation) const
3066 {
3067     // screen coordinates are a mirror image of "real" coordinates
3068     angle = -angle;
3069
3070     const bool has_alpha = HasAlpha();
3071
3072     const int w = GetWidth();
3073     const int h = GetHeight();
3074
3075     int i;
3076
3077     // Create pointer-based array to accelerate access to wxImage's data
3078     unsigned char ** data = new unsigned char * [h];
3079     data[0] = GetData();
3080     for (i = 1; i < h; i++)
3081         data[i] = data[i - 1] + (3 * w);
3082
3083     // Same for alpha channel
3084     unsigned char ** alpha = NULL;
3085     if (has_alpha)
3086     {
3087         alpha = new unsigned char * [h];
3088         alpha[0] = GetAlpha();
3089         for (i = 1; i < h; i++)
3090             alpha[i] = alpha[i - 1] + w;
3091     }
3092
3093     // precompute coefficients for rotation formula
3094     const double cos_angle = cos(angle);
3095     const double sin_angle = sin(angle);
3096
3097     // Create new Image to store the result
3098     // First, find rectangle that covers the rotated image;  to do that,
3099     // rotate the four corners
3100
3101     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
3102
3103     wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
3104     wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
3105     wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
3106     wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
3107
3108     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
3109     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
3110     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
3111     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
3112
3113     // Create rotated image
3114     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
3115     // With alpha channel
3116     if (has_alpha)
3117         rotated.SetAlpha();
3118
3119     if (offset_after_rotation != NULL)
3120     {
3121         *offset_after_rotation = wxPoint (x1a, y1a);
3122     }
3123
3124     // the rotated (destination) image is always accessed sequentially via this
3125     // pointer, there is no need for pointer-based arrays here
3126     unsigned char *dst = rotated.GetData();
3127
3128     unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
3129
3130     // if the original image has a mask, use its RGB values as the blank pixel,
3131     // else, fall back to default (black).
3132     unsigned char blank_r = 0;
3133     unsigned char blank_g = 0;
3134     unsigned char blank_b = 0;
3135
3136     if (HasMask())
3137     {
3138         blank_r = GetMaskRed();
3139         blank_g = GetMaskGreen();
3140         blank_b = GetMaskBlue();
3141         rotated.SetMaskColour( blank_r, blank_g, blank_b );
3142     }
3143
3144     // Now, for each point of the rotated image, find where it came from, by
3145     // performing an inverse rotation (a rotation of -angle) and getting the
3146     // pixel at those coordinates
3147
3148     const int rH = rotated.GetHeight();
3149     const int rW = rotated.GetWidth();
3150
3151     // do the (interpolating) test outside of the loops, so that it is done
3152     // only once, instead of repeating it for each pixel.
3153     if (interpolating)
3154     {
3155         for (int y = 0; y < rH; y++)
3156         {
3157             for (int x = 0; x < rW; x++)
3158             {
3159                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3160
3161                 if (-0.25 < src.x && src.x < w - 0.75 &&
3162                     -0.25 < src.y && src.y < h - 0.75)
3163                 {
3164                     // interpolate using the 4 enclosing grid-points.  Those
3165                     // points can be obtained using floor and ceiling of the
3166                     // exact coordinates of the point
3167                     int x1, y1, x2, y2;
3168
3169                     if (0 < src.x && src.x < w - 1)
3170                     {
3171                         x1 = wxRound(floor(src.x));
3172                         x2 = wxRound(ceil(src.x));
3173                     }
3174                     else    // else means that x is near one of the borders (0 or width-1)
3175                     {
3176                         x1 = x2 = wxRound (src.x);
3177                     }
3178
3179                     if (0 < src.y && src.y < h - 1)
3180                     {
3181                         y1 = wxRound(floor(src.y));
3182                         y2 = wxRound(ceil(src.y));
3183                     }
3184                     else
3185                     {
3186                         y1 = y2 = wxRound (src.y);
3187                     }
3188
3189                     // get four points and the distances (square of the distance,
3190                     // for efficiency reasons) for the interpolation formula
3191
3192                     // GRG: Do not calculate the points until they are
3193                     //      really needed -- this way we can calculate
3194                     //      just one, instead of four, if d1, d2, d3
3195                     //      or d4 are < wxROTATE_EPSILON
3196
3197                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
3198                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
3199                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
3200                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
3201
3202                     // Now interpolate as a weighted average of the four surrounding
3203                     // points, where the weights are the distances to each of those points
3204
3205                     // If the point is exactly at one point of the grid of the source
3206                     // image, then don't interpolate -- just assign the pixel
3207
3208                     // d1,d2,d3,d4 are positive -- no need for abs()
3209                     if (d1 < wxROTATE_EPSILON)
3210                     {
3211                         unsigned char *p = data[y1] + (3 * x1);
3212                         *(dst++) = *(p++);
3213                         *(dst++) = *(p++);
3214                         *(dst++) = *p;
3215
3216                         if (has_alpha)
3217                             *(alpha_dst++) = *(alpha[y1] + x1);
3218                     }
3219                     else if (d2 < wxROTATE_EPSILON)
3220                     {
3221                         unsigned char *p = data[y1] + (3 * x2);
3222                         *(dst++) = *(p++);
3223                         *(dst++) = *(p++);
3224                         *(dst++) = *p;
3225
3226                         if (has_alpha)
3227                             *(alpha_dst++) = *(alpha[y1] + x2);
3228                     }
3229                     else if (d3 < wxROTATE_EPSILON)
3230                     {
3231                         unsigned char *p = data[y2] + (3 * x2);
3232                         *(dst++) = *(p++);
3233                         *(dst++) = *(p++);
3234                         *(dst++) = *p;
3235
3236                         if (has_alpha)
3237                             *(alpha_dst++) = *(alpha[y2] + x2);
3238                     }
3239                     else if (d4 < wxROTATE_EPSILON)
3240                     {
3241                         unsigned char *p = data[y2] + (3 * x1);
3242                         *(dst++) = *(p++);
3243                         *(dst++) = *(p++);
3244                         *(dst++) = *p;
3245
3246                         if (has_alpha)
3247                             *(alpha_dst++) = *(alpha[y2] + x1);
3248                     }
3249                     else
3250                     {
3251                         // weights for the weighted average are proportional to the inverse of the distance
3252                         unsigned char *v1 = data[y1] + (3 * x1);
3253                         unsigned char *v2 = data[y1] + (3 * x2);
3254                         unsigned char *v3 = data[y2] + (3 * x2);
3255                         unsigned char *v4 = data[y2] + (3 * x1);
3256
3257                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
3258
3259                         // GRG: Unrolled.
3260
3261                         *(dst++) = (unsigned char)
3262                             ( (w1 * *(v1++) + w2 * *(v2++) +
3263                                w3 * *(v3++) + w4 * *(v4++)) /
3264                               (w1 + w2 + w3 + w4) );
3265                         *(dst++) = (unsigned char)
3266                             ( (w1 * *(v1++) + w2 * *(v2++) +
3267                                w3 * *(v3++) + w4 * *(v4++)) /
3268                               (w1 + w2 + w3 + w4) );
3269                         *(dst++) = (unsigned char)
3270                             ( (w1 * *v1 + w2 * *v2 +
3271                                w3 * *v3 + w4 * *v4) /
3272                               (w1 + w2 + w3 + w4) );
3273
3274                         if (has_alpha)
3275                         {
3276                             v1 = alpha[y1] + (x1);
3277                             v2 = alpha[y1] + (x2);
3278                             v3 = alpha[y2] + (x2);
3279                             v4 = alpha[y2] + (x1);
3280
3281                             *(alpha_dst++) = (unsigned char)
3282                                 ( (w1 * *v1 + w2 * *v2 +
3283                                    w3 * *v3 + w4 * *v4) /
3284                                   (w1 + w2 + w3 + w4) );
3285                         }
3286                     }
3287                 }
3288                 else
3289                 {
3290                     *(dst++) = blank_r;
3291                     *(dst++) = blank_g;
3292                     *(dst++) = blank_b;
3293
3294                     if (has_alpha)
3295                         *(alpha_dst++) = 0;
3296                 }
3297             }
3298         }
3299     }
3300     else // not interpolating
3301     {
3302         for (int y = 0; y < rH; y++)
3303         {
3304             for (int x = 0; x < rW; x++)
3305             {
3306                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3307
3308                 const int xs = wxRound (src.x);      // wxRound rounds to the
3309                 const int ys = wxRound (src.y);      // closest integer
3310
3311                 if (0 <= xs && xs < w && 0 <= ys && ys < h)
3312                 {
3313                     unsigned char *p = data[ys] + (3 * xs);
3314                     *(dst++) = *(p++);
3315                     *(dst++) = *(p++);
3316                     *(dst++) = *p;
3317
3318                     if (has_alpha)
3319                         *(alpha_dst++) = *(alpha[ys] + (xs));
3320                 }
3321                 else
3322                 {
3323                     *(dst++) = blank_r;
3324                     *(dst++) = blank_g;
3325                     *(dst++) = blank_b;
3326
3327                     if (has_alpha)
3328                         *(alpha_dst++) = 255;
3329                 }
3330             }
3331         }
3332     }
3333
3334     delete [] data;
3335     delete [] alpha;
3336
3337     return rotated;
3338 }
3339
3340
3341
3342
3343
3344 // A module to allow wxImage initialization/cleanup
3345 // without calling these functions from app.cpp or from
3346 // the user's application.
3347
3348 class wxImageModule: public wxModule
3349 {
3350 DECLARE_DYNAMIC_CLASS(wxImageModule)
3351 public:
3352     wxImageModule() {}
3353     bool OnInit() { wxImage::InitStandardHandlers(); return true; }
3354     void OnExit() { wxImage::CleanUpHandlers(); }
3355 };
3356
3357 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
3358
3359
3360 #endif // wxUSE_IMAGE