src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/common/image.cpp
   3 // Purpose:     wxImage
   4 // Author:      Robert Roebling
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #ifdef __BORLANDC__
  14     #pragma hdrstop
  15 #endif
  16
  17 #if wxUSE_IMAGE
  18
  19 #include "wx/image.h"
  20
  21 #ifndef WX_PRECOMP
  22     #include "wx/log.h"
  23     #include "wx/hash.h"
  24     #include "wx/utils.h"
  25     #include "wx/math.h"
  26     #include "wx/module.h"
  27     #include "wx/palette.h"
  28     #include "wx/intl.h"
  29 #endif
  30
  31 #include "wx/filefn.h"
  32 #include "wx/wfstream.h"
  33 #include "wx/xpmdecod.h"
  34
  35 // For memcpy
  36 #include <string.h>
  37
  38 // make the code compile with either wxFile*Stream or wxFFile*Stream:
  39 #define HAS_FILE_STREAMS (wxUSE_STREAMS && (wxUSE_FILE || wxUSE_FFILE))
  40
  41 #if HAS_FILE_STREAMS
  42     #if wxUSE_FFILE
  43         typedef wxFFileInputStream wxImageFileInputStream;
  44         typedef wxFFileOutputStream wxImageFileOutputStream;
  45     #elif wxUSE_FILE
  46         typedef wxFileInputStream wxImageFileInputStream;
  47         typedef wxFileOutputStream wxImageFileOutputStream;
  48     #endif // wxUSE_FILE/wxUSE_FFILE
  49 #endif // HAS_FILE_STREAMS
  50
  51 #if wxUSE_VARIANT
  52 IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(wxImage,WXDLLEXPORT)
  53 #endif
  54
  55 //-----------------------------------------------------------------------------
  56 // global data
  57 //-----------------------------------------------------------------------------
  58
  59 wxList wxImage::sm_handlers;
  60 wxImage wxNullImage;
  61
  62 //-----------------------------------------------------------------------------
  63 // wxImageRefData
  64 //-----------------------------------------------------------------------------
  65
  66 class wxImageRefData: public wxObjectRefData
  67 {
  68 public:
  69     wxImageRefData();
  70     virtual ~wxImageRefData();
  71
  72     int             m_width;
  73     int             m_height;
  74     wxBitmapType    m_type;
  75     unsigned char  *m_data;
  76
  77     bool            m_hasMask;
  78     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  79
  80     // alpha channel data, may be NULL for the formats without alpha support
  81     unsigned char  *m_alpha;
  82
  83     bool            m_ok;
  84
  85     // if true, m_data is pointer to static data and shouldn't be freed
  86     bool            m_static;
  87
  88     // same as m_static but for m_alpha
  89     bool            m_staticAlpha;
  90
  91 #if wxUSE_PALETTE
  92     wxPalette       m_palette;
  93 #endif // wxUSE_PALETTE
  94
  95     wxArrayString   m_optionNames;
  96     wxArrayString   m_optionValues;
  97
  98     wxDECLARE_NO_COPY_CLASS(wxImageRefData);
  99 };
 100
 101 wxImageRefData::wxImageRefData()
 102 {
 103     m_width = 0;
 104     m_height = 0;
 105     m_type = wxBITMAP_TYPE_INVALID;
 106     m_data =
 107     m_alpha = (unsigned char *) NULL;
 108
 109     m_maskRed = 0;
 110     m_maskGreen = 0;
 111     m_maskBlue = 0;
 112     m_hasMask = false;
 113
 114     m_ok = false;
 115     m_static =
 116     m_staticAlpha = false;
 117 }
 118
 119 wxImageRefData::~wxImageRefData()
 120 {
 121     if ( !m_static )
 122         free( m_data );
 123     if ( !m_staticAlpha )
 124         free( m_alpha );
 125 }
 126
 127
 128 //-----------------------------------------------------------------------------
 129 // wxImage
 130 //-----------------------------------------------------------------------------
 131
 132 #define M_IMGDATA static_cast<wxImageRefData*>(m_refData)
 133
 134 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 135
 136 bool wxImage::Create(const char* const* xpmData)
 137 {
 138 #if wxUSE_XPM
 139     UnRef();
 140
 141     wxXPMDecoder decoder;
 142     (*this) = decoder.ReadData(xpmData);
 143     return Ok();
 144 #else
 145     return false;
 146 #endif
 147 }
 148
 149 bool wxImage::Create( int width, int height, bool clear )
 150 {
 151     UnRef();
 152
 153     m_refData = new wxImageRefData();
 154
 155     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 156     if (!M_IMGDATA->m_data)
 157     {
 158         UnRef();
 159         return false;
 160     }
 161
 162     M_IMGDATA->m_width = width;
 163     M_IMGDATA->m_height = height;
 164     M_IMGDATA->m_ok = true;
 165
 166     if (clear)
 167     {
 168         Clear();
 169     }
 170
 171     return true;
 172 }
 173
 174 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 175 {
 176     UnRef();
 177
 178     wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 179
 180     m_refData = new wxImageRefData();
 181
 182     M_IMGDATA->m_data = data;
 183     M_IMGDATA->m_width = width;
 184     M_IMGDATA->m_height = height;
 185     M_IMGDATA->m_ok = true;
 186     M_IMGDATA->m_static = static_data;
 187
 188     return true;
 189 }
 190
 191 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 192 {
 193     UnRef();
 194
 195     wxCHECK_MSG( data, false, wxT("NULL data in wxImage::Create") );
 196
 197     m_refData = new wxImageRefData();
 198
 199     M_IMGDATA->m_data = data;
 200     M_IMGDATA->m_alpha = alpha;
 201     M_IMGDATA->m_width = width;
 202     M_IMGDATA->m_height = height;
 203     M_IMGDATA->m_ok = true;
 204     M_IMGDATA->m_static = static_data;
 205     M_IMGDATA->m_staticAlpha = static_data;
 206
 207     return true;
 208 }
 209
 210 void wxImage::Destroy()
 211 {
 212     UnRef();
 213 }
 214
 215 void wxImage::Clear(unsigned char value)
 216 {
 217     memset(M_IMGDATA->m_data, value, M_IMGDATA->m_width*M_IMGDATA->m_height*3);
 218 }
 219
 220 wxObjectRefData* wxImage::CreateRefData() const
 221 {
 222     return new wxImageRefData;
 223 }
 224
 225 wxObjectRefData* wxImage::CloneRefData(const wxObjectRefData* that) const
 226 {
 227     const wxImageRefData* refData = static_cast<const wxImageRefData*>(that);
 228     wxCHECK_MSG(refData->m_ok, NULL, wxT("invalid image") );
 229
 230     wxImageRefData* refData_new = new wxImageRefData;
 231     refData_new->m_width = refData->m_width;
 232     refData_new->m_height = refData->m_height;
 233     refData_new->m_maskRed = refData->m_maskRed;
 234     refData_new->m_maskGreen = refData->m_maskGreen;
 235     refData_new->m_maskBlue = refData->m_maskBlue;
 236     refData_new->m_hasMask = refData->m_hasMask;
 237     refData_new->m_ok = true;
 238     unsigned size = unsigned(refData->m_width) * unsigned(refData->m_height);
 239     if (refData->m_alpha != NULL)
 240     {
 241         refData_new->m_alpha = (unsigned char*)malloc(size);
 242         memcpy(refData_new->m_alpha, refData->m_alpha, size);
 243     }
 244     size *= 3;
 245     refData_new->m_data = (unsigned char*)malloc(size);
 246     memcpy(refData_new->m_data, refData->m_data, size);
 247 #if wxUSE_PALETTE
 248     refData_new->m_palette = refData->m_palette;
 249 #endif
 250     refData_new->m_optionNames = refData->m_optionNames;
 251     refData_new->m_optionValues = refData->m_optionValues;
 252     return refData_new;
 253 }
 254
 255 wxImage wxImage::Copy() const
 256 {
 257     wxImage image;
 258
 259     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 260
 261     image.m_refData = CloneRefData(m_refData);
 262
 263     return image;
 264 }
 265
 266 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 267 {
 268     if( xFactor == 1 && yFactor == 1 )
 269         return *this;
 270
 271     wxImage image;
 272
 273     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 274
 275     // can't scale to/from 0 size
 276     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 277                  wxT("invalid new image size") );
 278
 279     long old_height = M_IMGDATA->m_height,
 280          old_width  = M_IMGDATA->m_width;
 281
 282     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 283                  wxT("invalid old image size") );
 284
 285     long width = old_width / xFactor ;
 286     long height = old_height / yFactor ;
 287
 288     image.Create( width, height, false );
 289
 290     char unsigned *data = image.GetData();
 291
 292     wxCHECK_MSG( data, image, wxT("unable to create image") );
 293
 294     bool hasMask = false ;
 295     unsigned char maskRed = 0;
 296     unsigned char maskGreen = 0;
 297     unsigned char maskBlue =0 ;
 298
 299     unsigned char *source_data = M_IMGDATA->m_data;
 300     unsigned char *target_data = data;
 301     unsigned char *source_alpha = 0 ;
 302     unsigned char *target_alpha = 0 ;
 303     if (M_IMGDATA->m_hasMask)
 304     {
 305         hasMask = true ;
 306         maskRed = M_IMGDATA->m_maskRed;
 307         maskGreen = M_IMGDATA->m_maskGreen;
 308         maskBlue =M_IMGDATA->m_maskBlue ;
 309
 310         image.SetMaskColour( M_IMGDATA->m_maskRed,
 311                              M_IMGDATA->m_maskGreen,
 312                              M_IMGDATA->m_maskBlue );
 313     }
 314     else
 315     {
 316         source_alpha = M_IMGDATA->m_alpha ;
 317         if ( source_alpha )
 318         {
 319             image.SetAlpha() ;
 320             target_alpha = image.GetAlpha() ;
 321         }
 322     }
 323
 324     for (long y = 0; y < height; y++)
 325     {
 326         for (long x = 0; x < width; x++)
 327         {
 328             unsigned long avgRed = 0 ;
 329             unsigned long avgGreen = 0;
 330             unsigned long avgBlue = 0;
 331             unsigned long avgAlpha = 0 ;
 332             unsigned long counter = 0 ;
 333             // determine average
 334             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 335             {
 336                 long y_offset = (y * yFactor + y1) * old_width;
 337                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 338                 {
 339                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 340                     unsigned char red = pixel[0] ;
 341                     unsigned char green = pixel[1] ;
 342                     unsigned char blue = pixel[2] ;
 343                     unsigned char alpha = 255  ;
 344                     if ( source_alpha )
 345                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 346                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 347                     {
 348                         if ( alpha > 0 )
 349                         {
 350                             avgRed += red ;
 351                             avgGreen += green ;
 352                             avgBlue += blue ;
 353                         }
 354                         avgAlpha += alpha ;
 355                         counter++ ;
 356                     }
 357                 }
 358             }
 359             if ( counter == 0 )
 360             {
 361                 *(target_data++) = M_IMGDATA->m_maskRed ;
 362                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 363                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 364             }
 365             else
 366             {
 367                 if ( source_alpha )
 368                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 369                 *(target_data++) = (unsigned char)(avgRed / counter);
 370                 *(target_data++) = (unsigned char)(avgGreen / counter);
 371                 *(target_data++) = (unsigned char)(avgBlue / counter);
 372             }
 373         }
 374     }
 375
 376     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 377     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 378         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 379                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 380     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 381         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 382                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 383
 384     return image;
 385 }
 386
 387 wxImage
 388 wxImage::Scale( int width, int height, wxImageResizeQuality quality ) const
 389 {
 390     wxImage image;
 391
 392     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 393
 394     // can't scale to/from 0 size
 395     wxCHECK_MSG( (width > 0) && (height > 0), image,
 396                  wxT("invalid new image size") );
 397
 398     long old_height = M_IMGDATA->m_height,
 399          old_width  = M_IMGDATA->m_width;
 400     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 401                  wxT("invalid old image size") );
 402
 403     // If the image's new width and height are the same as the original, no
 404     // need to waste time or CPU cycles
 405     if ( old_width == width && old_height == height )
 406         return *this;
 407
 408     // resample the image using either the nearest neighbourhood, bilinear or
 409     // bicubic method as specified
 410     switch ( quality )
 411     {
 412         case wxIMAGE_QUALITY_BICUBIC:
 413         case wxIMAGE_QUALITY_BILINEAR:
 414             // both of these algorithms should be used for up-sampling the
 415             // image only, when down-sampling always use box averaging for best
 416             // results
 417             if ( width < old_width && height < old_height )
 418                 image = ResampleBox(width, height);
 419             else if ( quality == wxIMAGE_QUALITY_BILINEAR )
 420                 image = ResampleBilinear(width, height);
 421             else if ( quality == wxIMAGE_QUALITY_BICUBIC )
 422                 image = ResampleBicubic(width, height);
 423             break;
 424
 425         case wxIMAGE_QUALITY_NEAREST:
 426             if ( old_width % width == 0 && old_width >= width &&
 427                 old_height % height == 0 && old_height >= height )
 428             {
 429                 return ShrinkBy( old_width / width , old_height / height );
 430             }
 431
 432             image = ResampleNearest(width, height);
 433             break;
 434     }
 435
 436     // If the original image has a mask, apply the mask to the new image
 437     if (M_IMGDATA->m_hasMask)
 438     {
 439         image.SetMaskColour( M_IMGDATA->m_maskRed,
 440                             M_IMGDATA->m_maskGreen,
 441                             M_IMGDATA->m_maskBlue );
 442     }
 443
 444     // In case this is a cursor, make sure the hotspot is scaled accordingly:
 445     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 446         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 447                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 448     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 449         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 450                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 451
 452     return image;
 453 }
 454
 455 wxImage wxImage::ResampleNearest(int width, int height) const
 456 {
 457     wxImage image;
 458     image.Create( width, height, false );
 459
 460     unsigned char *data = image.GetData();
 461
 462     wxCHECK_MSG( data, image, wxT("unable to create image") );
 463
 464     unsigned char *source_data = M_IMGDATA->m_data;
 465     unsigned char *target_data = data;
 466     unsigned char *source_alpha = 0 ;
 467     unsigned char *target_alpha = 0 ;
 468
 469     if ( !M_IMGDATA->m_hasMask )
 470     {
 471         source_alpha = M_IMGDATA->m_alpha ;
 472         if ( source_alpha )
 473         {
 474             image.SetAlpha() ;
 475             target_alpha = image.GetAlpha() ;
 476         }
 477     }
 478
 479     long old_height = M_IMGDATA->m_height,
 480          old_width  = M_IMGDATA->m_width;
 481     long x_delta = (old_width<<16) / width;
 482     long y_delta = (old_height<<16) / height;
 483
 484     unsigned char* dest_pixel = target_data;
 485
 486     long y = 0;
 487     for ( long j = 0; j < height; j++ )
 488     {
 489         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 490         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 491
 492         long x = 0;
 493         for ( long i = 0; i < width; i++ )
 494         {
 495             unsigned char* src_pixel = &src_line[(x>>16)*3];
 496             unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 497             dest_pixel[0] = src_pixel[0];
 498             dest_pixel[1] = src_pixel[1];
 499             dest_pixel[2] = src_pixel[2];
 500             dest_pixel += 3;
 501             if ( source_alpha )
 502                 *(target_alpha++) = *src_alpha_pixel ;
 503             x += x_delta;
 504         }
 505
 506         y += y_delta;
 507     }
 508
 509     return image;
 510 }
 511
 512 wxImage wxImage::ResampleBox(int width, int height) const
 513 {
 514     // This function implements a simple pre-blur/box averaging method for
 515     // downsampling that gives reasonably smooth results To scale the image
 516     // down we will need to gather a grid of pixels of the size of the scale
 517     // factor in each direction and then do an averaging of the pixels.
 518
 519     wxImage ret_image(width, height, false);
 520
 521     const double scale_factor_x = double(M_IMGDATA->m_width) / width;
 522     const double scale_factor_y = double(M_IMGDATA->m_height) / height;
 523
 524     const int scale_factor_x_2 = (int)(scale_factor_x / 2);
 525     const int scale_factor_y_2 = (int)(scale_factor_y / 2);
 526
 527     unsigned char* src_data = M_IMGDATA->m_data;
 528     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 529     unsigned char* dst_data = ret_image.GetData();
 530     unsigned char* dst_alpha = NULL;
 531
 532     if ( src_alpha )
 533     {
 534         ret_image.SetAlpha();
 535         dst_alpha = ret_image.GetAlpha();
 536     }
 537
 538     int averaged_pixels, src_pixel_index;
 539     double sum_r, sum_g, sum_b, sum_a;
 540
 541     for ( int y = 0; y < height; y++ )         // Destination image - Y direction
 542     {
 543         // Source pixel in the Y direction
 544         int src_y = (int)(y * scale_factor_y);
 545
 546         for ( int x = 0; x < width; x++ )      // Destination image - X direction
 547         {
 548             // Source pixel in the X direction
 549             int src_x = (int)(x * scale_factor_x);
 550
 551             // Box of pixels to average
 552             averaged_pixels = 0;
 553             sum_r = sum_g = sum_b = sum_a = 0.0;
 554
 555             for ( int j = int(src_y - scale_factor_y/2.0 + 1);
 556                   j <= int(src_y + scale_factor_y_2);
 557                   j++ )
 558             {
 559                 // We don't care to average pixels that don't exist (edges)
 560                 if ( j < 0 || j > M_IMGDATA->m_height - 1 )
 561                     continue;
 562
 563                 for ( int i = int(src_x - scale_factor_x/2.0 + 1);
 564                       i <= src_x + scale_factor_x_2;
 565                       i++ )
 566                 {
 567                     // Don't average edge pixels
 568                     if ( i < 0 || i > M_IMGDATA->m_width - 1 )
 569                         continue;
 570
 571                     // Calculate the actual index in our source pixels
 572                     src_pixel_index = j * M_IMGDATA->m_width + i;
 573
 574                     sum_r += src_data[src_pixel_index * 3 + 0];
 575                     sum_g += src_data[src_pixel_index * 3 + 1];
 576                     sum_b += src_data[src_pixel_index * 3 + 2];
 577                     if ( src_alpha )
 578                         sum_a += src_alpha[src_pixel_index];
 579
 580                     averaged_pixels++;
 581                 }
 582             }
 583
 584             // Calculate the average from the sum and number of averaged pixels
 585             dst_data[0] = (unsigned char)(sum_r / averaged_pixels);
 586             dst_data[1] = (unsigned char)(sum_g / averaged_pixels);
 587             dst_data[2] = (unsigned char)(sum_b / averaged_pixels);
 588             dst_data += 3;
 589             if ( src_alpha )
 590                 *dst_alpha++ = (unsigned char)(sum_a / averaged_pixels);
 591         }
 592     }
 593
 594     return ret_image;
 595 }
 596
 597 wxImage wxImage::ResampleBilinear(int width, int height) const
 598 {
 599     // This function implements a Bilinear algorithm for resampling.
 600     wxImage ret_image(width, height, false);
 601     unsigned char* src_data = M_IMGDATA->m_data;
 602     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 603     unsigned char* dst_data = ret_image.GetData();
 604     unsigned char* dst_alpha = NULL;
 605
 606     if ( src_alpha )
 607     {
 608         ret_image.SetAlpha();
 609         dst_alpha = ret_image.GetAlpha();
 610     }
 611     double HFactor = double(M_IMGDATA->m_height) / height;
 612     double WFactor = double(M_IMGDATA->m_width) / width;
 613
 614     int srcpixymax = M_IMGDATA->m_height - 1;
 615     int srcpixxmax = M_IMGDATA->m_width - 1;
 616
 617     double srcpixy, srcpixy1, srcpixy2, dy, dy1;
 618     double srcpixx, srcpixx1, srcpixx2, dx, dx1;
 619     double r1, g1, b1, a1;
 620     double r2, g2, b2, a2;
 621
 622     for ( int dsty = 0; dsty < height; dsty++ )
 623     {
 624         // We need to calculate the source pixel to interpolate from - Y-axis
 625         srcpixy = double(dsty) * HFactor;
 626         srcpixy1 = int(srcpixy);
 627         srcpixy2 = ( srcpixy1 == srcpixymax ) ? srcpixy1 : srcpixy1 + 1.0;
 628         dy = srcpixy - (int)srcpixy;
 629         dy1 = 1.0 - dy;
 630
 631
 632         for ( int dstx = 0; dstx < width; dstx++ )
 633         {
 634             // X-axis of pixel to interpolate from
 635             srcpixx = double(dstx) * WFactor;
 636             srcpixx1 = int(srcpixx);
 637             srcpixx2 = ( srcpixx1 == srcpixxmax ) ? srcpixx1 : srcpixx1 + 1.0;
 638             dx = srcpixx - (int)srcpixx;
 639             dx1 = 1.0 - dx;
 640
 641             int x_offset1 = srcpixx1 < 0.0 ? 0 : srcpixx1 > srcpixxmax ? srcpixxmax : (int)srcpixx1;
 642             int x_offset2 = srcpixx2 < 0.0 ? 0 : srcpixx2 > srcpixxmax ? srcpixxmax : (int)srcpixx2;
 643             int y_offset1 = srcpixy1 < 0.0 ? 0 : srcpixy1 > srcpixymax ? srcpixymax : (int)srcpixy1;
 644             int y_offset2 = srcpixy2 < 0.0 ? 0 : srcpixy2 > srcpixymax ? srcpixymax : (int)srcpixy2;
 645
 646             int src_pixel_index00 = y_offset1 * M_IMGDATA->m_width + x_offset1;
 647             int src_pixel_index01 = y_offset1 * M_IMGDATA->m_width + x_offset2;
 648             int src_pixel_index10 = y_offset2 * M_IMGDATA->m_width + x_offset1;
 649             int src_pixel_index11 = y_offset2 * M_IMGDATA->m_width + x_offset2;
 650
 651             //first line
 652             r1 = src_data[src_pixel_index00 * 3 + 0] * dx1 + src_data[src_pixel_index01 * 3 + 0] * dx;
 653             g1 = src_data[src_pixel_index00 * 3 + 1] * dx1 + src_data[src_pixel_index01 * 3 + 1] * dx;
 654             b1 = src_data[src_pixel_index00 * 3 + 2] * dx1 + src_data[src_pixel_index01 * 3 + 2] * dx;
 655             if ( src_alpha )
 656                 a1 = src_alpha[src_pixel_index00] * dx1 + src_alpha[src_pixel_index01] * dx;
 657
 658             //second line
 659             r2 = src_data[src_pixel_index10 * 3 + 0] * dx1 + src_data[src_pixel_index11 * 3 + 0] * dx;
 660             g2 = src_data[src_pixel_index10 * 3 + 1] * dx1 + src_data[src_pixel_index11 * 3 + 1] * dx;
 661             b2 = src_data[src_pixel_index10 * 3 + 2] * dx1 + src_data[src_pixel_index11 * 3 + 2] * dx;
 662             if ( src_alpha )
 663                 a2 = src_alpha[src_pixel_index10] * dx1 + src_alpha[src_pixel_index11] * dx;
 664
 665             //result lines
 666
 667             dst_data[0] = r1 * dy1 + r2 * dy;
 668             dst_data[1] = g1 * dy1 + g2 * dy;
 669             dst_data[2] = b1 * dy1 + b2 * dy;
 670             dst_data += 3;
 671
 672             if ( src_alpha )
 673                 *dst_alpha++ = a1 * dy1 + a2 * dy;
 674         }
 675     }
 676
 677     return ret_image;
 678 }
 679
 680 // The following two local functions are for the B-spline weighting of the
 681 // bicubic sampling algorithm
 682 static inline double spline_cube(double value)
 683 {
 684     return value <= 0.0 ? 0.0 : value * value * value;
 685 }
 686
 687 static inline double spline_weight(double value)
 688 {
 689     return (spline_cube(value + 2) -
 690             4 * spline_cube(value + 1) +
 691             6 * spline_cube(value) -
 692             4 * spline_cube(value - 1)) / 6;
 693 }
 694
 695 // This is the bicubic resampling algorithm
 696 wxImage wxImage::ResampleBicubic(int width, int height) const
 697 {
 698     // This function implements a Bicubic B-Spline algorithm for resampling.
 699     // This method is certainly a little slower than wxImage's default pixel
 700     // replication method, however for most reasonably sized images not being
 701     // upsampled too much on a fairly average CPU this difference is hardly
 702     // noticeable and the results are far more pleasing to look at.
 703     //
 704     // This particular bicubic algorithm does pixel weighting according to a
 705     // B-Spline that basically implements a Gaussian bell-like weighting
 706     // kernel. Because of this method the results may appear a bit blurry when
 707     // upsampling by large factors.  This is basically because a slight
 708     // gaussian blur is being performed to get the smooth look of the upsampled
 709     // image.
 710
 711     // Edge pixels: 3-4 possible solutions
 712     // - (Wrap/tile) Wrap the image, take the color value from the opposite
 713     // side of the image.
 714     // - (Mirror)    Duplicate edge pixels, so that pixel at coordinate (2, n),
 715     // where n is nonpositive, will have the value of (2, 1).
 716     // - (Ignore)    Simply ignore the edge pixels and apply the kernel only to
 717     // pixels which do have all neighbours.
 718     // - (Clamp)     Choose the nearest pixel along the border. This takes the
 719     // border pixels and extends them out to infinity.
 720     //
 721     // NOTE: below the y_offset and x_offset variables are being set for edge
 722     // pixels using the "Mirror" method mentioned above
 723
 724     wxImage ret_image;
 725
 726     ret_image.Create(width, height, false);
 727
 728     unsigned char* src_data = M_IMGDATA->m_data;
 729     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 730     unsigned char* dst_data = ret_image.GetData();
 731     unsigned char* dst_alpha = NULL;
 732
 733     if ( src_alpha )
 734     {
 735         ret_image.SetAlpha();
 736         dst_alpha = ret_image.GetAlpha();
 737     }
 738
 739     for ( int dsty = 0; dsty < height; dsty++ )
 740     {
 741         // We need to calculate the source pixel to interpolate from - Y-axis
 742         double srcpixy = double(dsty * M_IMGDATA->m_height) / height;
 743         double dy = srcpixy - (int)srcpixy;
 744
 745         for ( int dstx = 0; dstx < width; dstx++ )
 746         {
 747             // X-axis of pixel to interpolate from
 748             double srcpixx = double(dstx * M_IMGDATA->m_width) / width;
 749             double dx = srcpixx - (int)srcpixx;
 750
 751             // Sums for each color channel
 752             double sum_r = 0, sum_g = 0, sum_b = 0, sum_a = 0;
 753
 754             // Here we actually determine the RGBA values for the destination pixel
 755             for ( int k = -1; k <= 2; k++ )
 756             {
 757                 // Y offset
 758                 int y_offset = srcpixy + k < 0.0
 759                                 ? 0
 760                                 : srcpixy + k >= M_IMGDATA->m_height
 761                                        ? M_IMGDATA->m_height - 1
 762                                        : (int)(srcpixy + k);
 763
 764                 // Loop across the X axis
 765                 for ( int i = -1; i <= 2; i++ )
 766                 {
 767                     // X offset
 768                     int x_offset = srcpixx + i < 0.0
 769                                     ? 0
 770                                     : srcpixx + i >= M_IMGDATA->m_width
 771                                             ? M_IMGDATA->m_width - 1
 772                                             : (int)(srcpixx + i);
 773
 774                     // Calculate the exact position where the source data
 775                     // should be pulled from based on the x_offset and y_offset
 776                     int src_pixel_index = y_offset*M_IMGDATA->m_width + x_offset;
 777
 778                     // Calculate the weight for the specified pixel according
 779                     // to the bicubic b-spline kernel we're using for
 780                     // interpolation
 781                     double
 782                         pixel_weight = spline_weight(i - dx)*spline_weight(k - dy);
 783
 784                     // Create a sum of all velues for each color channel
 785                     // adjusted for the pixel's calculated weight
 786                     sum_r += src_data[src_pixel_index * 3 + 0] * pixel_weight;
 787                     sum_g += src_data[src_pixel_index * 3 + 1] * pixel_weight;
 788                     sum_b += src_data[src_pixel_index * 3 + 2] * pixel_weight;
 789                     if ( src_alpha )
 790                         sum_a += src_alpha[src_pixel_index] * pixel_weight;
 791                 }
 792             }
 793
 794             // Put the data into the destination image.  The summed values are
 795             // of double data type and are rounded here for accuracy
 796             dst_data[0] = (unsigned char)(sum_r + 0.5);
 797             dst_data[1] = (unsigned char)(sum_g + 0.5);
 798             dst_data[2] = (unsigned char)(sum_b + 0.5);
 799             dst_data += 3;
 800
 801             if ( src_alpha )
 802                 *dst_alpha++ = (unsigned char)sum_a;
 803         }
 804     }
 805
 806     return ret_image;
 807 }
 808
 809 // Blur in the horizontal direction
 810 wxImage wxImage::BlurHorizontal(int blurRadius) const
 811 {
 812     wxImage ret_image;
 813     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 814
 815     unsigned char* src_data = M_IMGDATA->m_data;
 816     unsigned char* dst_data = ret_image.GetData();
 817     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 818     unsigned char* dst_alpha = NULL;
 819
 820     // Check for a mask or alpha
 821     if ( src_alpha )
 822     {
 823         ret_image.SetAlpha();
 824         dst_alpha = ret_image.GetAlpha();
 825     }
 826     else if ( M_IMGDATA->m_hasMask )
 827     {
 828         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 829                                 M_IMGDATA->m_maskGreen,
 830                                 M_IMGDATA->m_maskBlue);
 831     }
 832
 833     // number of pixels we average over
 834     const int blurArea = blurRadius*2 + 1;
 835
 836     // Horizontal blurring algorithm - average all pixels in the specified blur
 837     // radius in the X or horizontal direction
 838     for ( int y = 0; y < M_IMGDATA->m_height; y++ )
 839     {
 840         // Variables used in the blurring algorithm
 841         long sum_r = 0,
 842              sum_g = 0,
 843              sum_b = 0,
 844              sum_a = 0;
 845
 846         long pixel_idx;
 847         const unsigned char *src;
 848         unsigned char *dst;
 849
 850         // Calculate the average of all pixels in the blur radius for the first
 851         // pixel of the row
 852         for ( int kernel_x = -blurRadius; kernel_x <= blurRadius; kernel_x++ )
 853         {
 854             // To deal with the pixels at the start of a row so it's not
 855             // grabbing GOK values from memory at negative indices of the
 856             // image's data or grabbing from the previous row
 857             if ( kernel_x < 0 )
 858                 pixel_idx = y * M_IMGDATA->m_width;
 859             else
 860                 pixel_idx = kernel_x + y * M_IMGDATA->m_width;
 861
 862             src = src_data + pixel_idx*3;
 863             sum_r += src[0];
 864             sum_g += src[1];
 865             sum_b += src[2];
 866             if ( src_alpha )
 867                 sum_a += src_alpha[pixel_idx];
 868         }
 869
 870         dst = dst_data + y * M_IMGDATA->m_width*3;
 871         dst[0] = (unsigned char)(sum_r / blurArea);
 872         dst[1] = (unsigned char)(sum_g / blurArea);
 873         dst[2] = (unsigned char)(sum_b / blurArea);
 874         if ( src_alpha )
 875             dst_alpha[y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 876
 877         // Now average the values of the rest of the pixels by just moving the
 878         // blur radius box along the row
 879         for ( int x = 1; x < M_IMGDATA->m_width; x++ )
 880         {
 881             // Take care of edge pixels on the left edge by essentially
 882             // duplicating the edge pixel
 883             if ( x - blurRadius - 1 < 0 )
 884                 pixel_idx = y * M_IMGDATA->m_width;
 885             else
 886                 pixel_idx = (x - blurRadius - 1) + y * M_IMGDATA->m_width;
 887
 888             // Subtract the value of the pixel at the left side of the blur
 889             // radius box
 890             src = src_data + pixel_idx*3;
 891             sum_r -= src[0];
 892             sum_g -= src[1];
 893             sum_b -= src[2];
 894             if ( src_alpha )
 895                 sum_a -= src_alpha[pixel_idx];
 896
 897             // Take care of edge pixels on the right edge
 898             if ( x + blurRadius > M_IMGDATA->m_width - 1 )
 899                 pixel_idx = M_IMGDATA->m_width - 1 + y * M_IMGDATA->m_width;
 900             else
 901                 pixel_idx = x + blurRadius + y * M_IMGDATA->m_width;
 902
 903             // Add the value of the pixel being added to the end of our box
 904             src = src_data + pixel_idx*3;
 905             sum_r += src[0];
 906             sum_g += src[1];
 907             sum_b += src[2];
 908             if ( src_alpha )
 909                 sum_a += src_alpha[pixel_idx];
 910
 911             // Save off the averaged data
 912             dst = dst_data + x*3 + y*M_IMGDATA->m_width*3;
 913             dst[0] = (unsigned char)(sum_r / blurArea);
 914             dst[1] = (unsigned char)(sum_g / blurArea);
 915             dst[2] = (unsigned char)(sum_b / blurArea);
 916             if ( src_alpha )
 917                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
 918         }
 919     }
 920
 921     return ret_image;
 922 }
 923
 924 // Blur in the vertical direction
 925 wxImage wxImage::BlurVertical(int blurRadius) const
 926 {
 927     wxImage ret_image;
 928     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
 929
 930     unsigned char* src_data = M_IMGDATA->m_data;
 931     unsigned char* dst_data = ret_image.GetData();
 932     unsigned char* src_alpha = M_IMGDATA->m_alpha;
 933     unsigned char* dst_alpha = NULL;
 934
 935     // Check for a mask or alpha
 936     if ( src_alpha )
 937     {
 938         ret_image.SetAlpha();
 939         dst_alpha = ret_image.GetAlpha();
 940     }
 941     else if ( M_IMGDATA->m_hasMask )
 942     {
 943         ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
 944                                 M_IMGDATA->m_maskGreen,
 945                                 M_IMGDATA->m_maskBlue);
 946     }
 947
 948     // number of pixels we average over
 949     const int blurArea = blurRadius*2 + 1;
 950
 951     // Vertical blurring algorithm - same as horizontal but switched the
 952     // opposite direction
 953     for ( int x = 0; x < M_IMGDATA->m_width; x++ )
 954     {
 955         // Variables used in the blurring algorithm
 956         long sum_r = 0,
 957              sum_g = 0,
 958              sum_b = 0,
 959              sum_a = 0;
 960
 961         long pixel_idx;
 962         const unsigned char *src;
 963         unsigned char *dst;
 964
 965         // Calculate the average of all pixels in our blur radius box for the
 966         // first pixel of the column
 967         for ( int kernel_y = -blurRadius; kernel_y <= blurRadius; kernel_y++ )
 968         {
 969             // To deal with the pixels at the start of a column so it's not
 970             // grabbing GOK values from memory at negative indices of the
 971             // image's data or grabbing from the previous column
 972             if ( kernel_y < 0 )
 973                 pixel_idx = x;
 974             else
 975                 pixel_idx = x + kernel_y * M_IMGDATA->m_width;
 976
 977             src = src_data + pixel_idx*3;
 978             sum_r += src[0];
 979             sum_g += src[1];
 980             sum_b += src[2];
 981             if ( src_alpha )
 982                 sum_a += src_alpha[pixel_idx];
 983         }
 984
 985         dst = dst_data + x*3;
 986         dst[0] = (unsigned char)(sum_r / blurArea);
 987         dst[1] = (unsigned char)(sum_g / blurArea);
 988         dst[2] = (unsigned char)(sum_b / blurArea);
 989         if ( src_alpha )
 990             dst_alpha[x] = (unsigned char)(sum_a / blurArea);
 991
 992         // Now average the values of the rest of the pixels by just moving the
 993         // box along the column from top to bottom
 994         for ( int y = 1; y < M_IMGDATA->m_height; y++ )
 995         {
 996             // Take care of pixels that would be beyond the top edge by
 997             // duplicating the top edge pixel for the column
 998             if ( y - blurRadius - 1 < 0 )
 999                 pixel_idx = x;
1000             else
1001                 pixel_idx = x + (y - blurRadius - 1) * M_IMGDATA->m_width;
1002
1003             // Subtract the value of the pixel at the top of our blur radius box
1004             src = src_data + pixel_idx*3;
1005             sum_r -= src[0];
1006             sum_g -= src[1];
1007             sum_b -= src[2];
1008             if ( src_alpha )
1009                 sum_a -= src_alpha[pixel_idx];
1010
1011             // Take care of the pixels that would be beyond the bottom edge of
1012             // the image similar to the top edge
1013             if ( y + blurRadius > M_IMGDATA->m_height - 1 )
1014                 pixel_idx = x + (M_IMGDATA->m_height - 1) * M_IMGDATA->m_width;
1015             else
1016                 pixel_idx = x + (blurRadius + y) * M_IMGDATA->m_width;
1017
1018             // Add the value of the pixel being added to the end of our box
1019             src = src_data + pixel_idx*3;
1020             sum_r += src[0];
1021             sum_g += src[1];
1022             sum_b += src[2];
1023             if ( src_alpha )
1024                 sum_a += src_alpha[pixel_idx];
1025
1026             // Save off the averaged data
1027             dst = dst_data + (x + y * M_IMGDATA->m_width) * 3;
1028             dst[0] = (unsigned char)(sum_r / blurArea);
1029             dst[1] = (unsigned char)(sum_g / blurArea);
1030             dst[2] = (unsigned char)(sum_b / blurArea);
1031             if ( src_alpha )
1032                 dst_alpha[x + y * M_IMGDATA->m_width] = (unsigned char)(sum_a / blurArea);
1033         }
1034     }
1035
1036     return ret_image;
1037 }
1038
1039 // The new blur function
1040 wxImage wxImage::Blur(int blurRadius) const
1041 {
1042     wxImage ret_image;
1043     ret_image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1044
1045     // Blur the image in each direction
1046     ret_image = BlurHorizontal(blurRadius);
1047     ret_image = ret_image.BlurVertical(blurRadius);
1048
1049     return ret_image;
1050 }
1051
1052 wxImage wxImage::Rotate90( bool clockwise ) const
1053 {
1054     wxImage image;
1055
1056     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1057
1058     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
1059
1060     unsigned char *data = image.GetData();
1061
1062     wxCHECK_MSG( data, image, wxT("unable to create image") );
1063
1064     unsigned char *source_data = M_IMGDATA->m_data;
1065     unsigned char *target_data;
1066     unsigned char *alpha_data = 0 ;
1067     unsigned char *source_alpha = 0 ;
1068     unsigned char *target_alpha = 0 ;
1069
1070     if (M_IMGDATA->m_hasMask)
1071     {
1072         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1073     }
1074     else
1075     {
1076         source_alpha = M_IMGDATA->m_alpha ;
1077         if ( source_alpha )
1078         {
1079             image.SetAlpha() ;
1080             alpha_data = image.GetAlpha() ;
1081         }
1082     }
1083
1084     long height = M_IMGDATA->m_height;
1085     long width  = M_IMGDATA->m_width;
1086
1087     for (long j = 0; j < height; j++)
1088     {
1089         for (long i = 0; i < width; i++)
1090         {
1091             if (clockwise)
1092             {
1093                 target_data = data + (((i+1)*height) - j - 1)*3;
1094                 if(source_alpha)
1095                     target_alpha = alpha_data + (((i+1)*height) - j - 1);
1096             }
1097             else
1098             {
1099                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
1100                 if(source_alpha)
1101                     target_alpha = alpha_data + ((height*(width-1)) + j - (i*height));
1102             }
1103             memcpy( target_data, source_data, 3 );
1104             source_data += 3;
1105
1106             if(source_alpha)
1107             {
1108                 memcpy( target_alpha, source_alpha, 1 );
1109                 source_alpha += 1;
1110             }
1111         }
1112     }
1113
1114     return image;
1115 }
1116
1117 wxImage wxImage::Mirror( bool horizontally ) const
1118 {
1119     wxImage image;
1120
1121     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1122
1123     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1124
1125     unsigned char *data = image.GetData();
1126     unsigned char *alpha = NULL;
1127
1128     wxCHECK_MSG( data, image, wxT("unable to create image") );
1129
1130     if (M_IMGDATA->m_alpha != NULL) {
1131         image.SetAlpha();
1132         alpha = image.GetAlpha();
1133         wxCHECK_MSG( alpha, image, wxT("unable to create alpha channel") );
1134     }
1135
1136     if (M_IMGDATA->m_hasMask)
1137         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1138
1139     long height = M_IMGDATA->m_height;
1140     long width  = M_IMGDATA->m_width;
1141
1142     unsigned char *source_data = M_IMGDATA->m_data;
1143     unsigned char *target_data;
1144
1145     if (horizontally)
1146     {
1147         for (long j = 0; j < height; j++)
1148         {
1149             data += width*3;
1150             target_data = data-3;
1151             for (long i = 0; i < width; i++)
1152             {
1153                 memcpy( target_data, source_data, 3 );
1154                 source_data += 3;
1155                 target_data -= 3;
1156             }
1157         }
1158
1159         if (alpha != NULL)
1160         {
1161             // src_alpha starts at the first pixel and increases by 1 after each step
1162             // (a step here is the copy of the alpha value of one pixel)
1163             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1164             // dest_alpha starts just beyond the first line, decreases before each step,
1165             // and after each line is finished, increases by 2 widths (skipping the line
1166             // just copied and the line that will be copied next)
1167             unsigned char *dest_alpha = alpha + width;
1168
1169             for (long jj = 0; jj < height; ++jj)
1170             {
1171                 for (long i = 0; i < width; ++i) {
1172                     *(--dest_alpha) = *(src_alpha++); // copy one pixel
1173                 }
1174                 dest_alpha += 2 * width; // advance beyond the end of the next line
1175             }
1176         }
1177     }
1178     else
1179     {
1180         for (long i = 0; i < height; i++)
1181         {
1182             target_data = data + 3*width*(height-1-i);
1183             memcpy( target_data, source_data, (size_t)3*width );
1184             source_data += 3*width;
1185         }
1186
1187         if (alpha != NULL)
1188         {
1189             // src_alpha starts at the first pixel and increases by 1 width after each step
1190             // (a step here is the copy of the alpha channel of an entire line)
1191             const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1192             // dest_alpha starts just beyond the last line (beyond the whole image)
1193             // and decreases by 1 width before each step
1194             unsigned char *dest_alpha = alpha + width * height;
1195
1196             for (long jj = 0; jj < height; ++jj)
1197             {
1198                 dest_alpha -= width;
1199                 memcpy( dest_alpha, src_alpha, (size_t)width );
1200                 src_alpha += width;
1201             }
1202         }
1203     }
1204
1205     return image;
1206 }
1207
1208 wxImage wxImage::GetSubImage( const wxRect &rect ) const
1209 {
1210     wxImage image;
1211
1212     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1213
1214     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) &&
1215                  (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
1216                  image, wxT("invalid subimage size") );
1217
1218     const int subwidth = rect.GetWidth();
1219     const int subheight = rect.GetHeight();
1220
1221     image.Create( subwidth, subheight, false );
1222
1223     const unsigned char *src_data = GetData();
1224     const unsigned char *src_alpha = M_IMGDATA->m_alpha;
1225     unsigned char *subdata = image.GetData();
1226     unsigned char *subalpha = NULL;
1227
1228     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
1229
1230     if (src_alpha != NULL) {
1231         image.SetAlpha();
1232         subalpha = image.GetAlpha();
1233         wxCHECK_MSG( subalpha, image, wxT("unable to create alpha channel"));
1234     }
1235
1236     if (M_IMGDATA->m_hasMask)
1237         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
1238
1239     const int width = GetWidth();
1240     const int pixsoff = rect.GetLeft() + width * rect.GetTop();
1241
1242     src_data += 3 * pixsoff;
1243     src_alpha += pixsoff; // won't be used if was NULL, so this is ok
1244
1245     for (long j = 0; j < subheight; ++j)
1246     {
1247         memcpy( subdata, src_data, 3 * subwidth );
1248         subdata += 3 * subwidth;
1249         src_data += 3 * width;
1250         if (subalpha != NULL) {
1251             memcpy( subalpha, src_alpha, subwidth );
1252             subalpha += subwidth;
1253             src_alpha += width;
1254         }
1255     }
1256
1257     return image;
1258 }
1259
1260 wxImage wxImage::Size( const wxSize& size, const wxPoint& pos,
1261                        int r_, int g_, int b_ ) const
1262 {
1263     wxImage image;
1264
1265     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1266     wxCHECK_MSG( (size.GetWidth() > 0) && (size.GetHeight() > 0), image, wxT("invalid size") );
1267
1268     int width = GetWidth(), height = GetHeight();
1269     image.Create(size.GetWidth(), size.GetHeight(), false);
1270
1271     unsigned char r = (unsigned char)r_;
1272     unsigned char g = (unsigned char)g_;
1273     unsigned char b = (unsigned char)b_;
1274     if ((r_ == -1) && (g_ == -1) && (b_ == -1))
1275     {
1276         GetOrFindMaskColour( &r, &g, &b );
1277         image.SetMaskColour(r, g, b);
1278     }
1279
1280     image.SetRGB(wxRect(), r, g, b);
1281
1282     wxRect subRect(pos.x, pos.y, width, height);
1283     wxRect finalRect(0, 0, size.GetWidth(), size.GetHeight());
1284     if (pos.x < 0)
1285         finalRect.width -= pos.x;
1286     if (pos.y < 0)
1287         finalRect.height -= pos.y;
1288
1289     subRect.Intersect(finalRect);
1290
1291     if (!subRect.IsEmpty())
1292     {
1293         if ((subRect.GetWidth() == width) && (subRect.GetHeight() == height))
1294             image.Paste(*this, pos.x, pos.y);
1295         else
1296             image.Paste(GetSubImage(subRect), pos.x, pos.y);
1297     }
1298
1299     return image;
1300 }
1301
1302 void wxImage::Paste( const wxImage &image, int x, int y )
1303 {
1304     wxCHECK_RET( Ok(), wxT("invalid image") );
1305     wxCHECK_RET( image.Ok(), wxT("invalid image") );
1306
1307     AllocExclusive();
1308
1309     int xx = 0;
1310     int yy = 0;
1311     int width = image.GetWidth();
1312     int height = image.GetHeight();
1313
1314     if (x < 0)
1315     {
1316         xx = -x;
1317         width += x;
1318     }
1319     if (y < 0)
1320     {
1321         yy = -y;
1322         height += y;
1323     }
1324
1325     if ((x+xx)+width > M_IMGDATA->m_width)
1326         width = M_IMGDATA->m_width - (x+xx);
1327     if ((y+yy)+height > M_IMGDATA->m_height)
1328         height = M_IMGDATA->m_height - (y+yy);
1329
1330     if (width < 1) return;
1331     if (height < 1) return;
1332
1333     if ((!HasMask() && !image.HasMask()) ||
1334         (HasMask() && !image.HasMask()) ||
1335        ((HasMask() && image.HasMask() &&
1336          (GetMaskRed()==image.GetMaskRed()) &&
1337          (GetMaskGreen()==image.GetMaskGreen()) &&
1338          (GetMaskBlue()==image.GetMaskBlue()))))
1339     {
1340         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1341         int source_step = image.GetWidth()*3;
1342
1343         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1344         int target_step = M_IMGDATA->m_width*3;
1345         for (int j = 0; j < height; j++)
1346         {
1347             memcpy( target_data, source_data, width*3 );
1348             source_data += source_step;
1349             target_data += target_step;
1350         }
1351     }
1352
1353     // Copy over the alpha channel from the original image
1354     if ( image.HasAlpha() )
1355     {
1356         if ( !HasAlpha() )
1357             InitAlpha();
1358
1359         unsigned char* source_data = image.GetAlpha() + xx + yy*image.GetWidth();
1360         int source_step = image.GetWidth();
1361
1362         unsigned char* target_data = GetAlpha() + (x+xx) + (y+yy)*M_IMGDATA->m_width;
1363         int target_step = M_IMGDATA->m_width;
1364
1365         for (int j = 0; j < height; j++,
1366                                     source_data += source_step,
1367                                     target_data += target_step)
1368         {
1369             memcpy( target_data, source_data, width );
1370         }
1371     }
1372
1373     if (!HasMask() && image.HasMask())
1374     {
1375         unsigned char r = image.GetMaskRed();
1376         unsigned char g = image.GetMaskGreen();
1377         unsigned char b = image.GetMaskBlue();
1378
1379         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
1380         int source_step = image.GetWidth()*3;
1381
1382         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
1383         int target_step = M_IMGDATA->m_width*3;
1384
1385         for (int j = 0; j < height; j++)
1386         {
1387             for (int i = 0; i < width*3; i+=3)
1388             {
1389                 if ((source_data[i]   != r) ||
1390                     (source_data[i+1] != g) ||
1391                     (source_data[i+2] != b))
1392                 {
1393                     memcpy( target_data+i, source_data+i, 3 );
1394                 }
1395             }
1396             source_data += source_step;
1397             target_data += target_step;
1398         }
1399     }
1400 }
1401
1402 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
1403                        unsigned char r2, unsigned char g2, unsigned char b2 )
1404 {
1405     wxCHECK_RET( Ok(), wxT("invalid image") );
1406
1407     AllocExclusive();
1408
1409     unsigned char *data = GetData();
1410
1411     const int w = GetWidth();
1412     const int h = GetHeight();
1413
1414     for (int j = 0; j < h; j++)
1415         for (int i = 0; i < w; i++)
1416         {
1417             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
1418             {
1419                 data[0] = r2;
1420                 data[1] = g2;
1421                 data[2] = b2;
1422             }
1423             data += 3;
1424         }
1425 }
1426
1427 wxImage wxImage::ConvertToGreyscale( double lr, double lg, double lb ) const
1428 {
1429     wxImage image;
1430
1431     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1432
1433     image.Create(M_IMGDATA->m_width, M_IMGDATA->m_height, false);
1434
1435     unsigned char *dest = image.GetData();
1436
1437     wxCHECK_MSG( dest, image, wxT("unable to create image") );
1438
1439     unsigned char *src = M_IMGDATA->m_data;
1440     bool hasMask = M_IMGDATA->m_hasMask;
1441     unsigned char maskRed = M_IMGDATA->m_maskRed;
1442     unsigned char maskGreen = M_IMGDATA->m_maskGreen;
1443     unsigned char maskBlue = M_IMGDATA->m_maskBlue;
1444
1445     if ( hasMask )
1446         image.SetMaskColour(maskRed, maskGreen, maskBlue);
1447
1448     const long size = M_IMGDATA->m_width * M_IMGDATA->m_height;
1449     for ( long i = 0; i < size; i++, src += 3, dest += 3 )
1450     {
1451         // don't modify the mask
1452         if ( hasMask && src[0] == maskRed && src[1] == maskGreen && src[2] == maskBlue )
1453         {
1454             memcpy(dest, src, 3);
1455         }
1456         else
1457         {
1458             // calculate the luma
1459             double luma = (src[0] * lr + src[1] * lg + src[2] * lb) + 0.5;
1460             dest[0] = dest[1] = dest[2] = static_cast<unsigned char>(luma);
1461         }
1462     }
1463
1464     // copy the alpha channel, if any
1465     if (HasAlpha())
1466     {
1467         const size_t alphaSize = GetWidth() * GetHeight();
1468         unsigned char *alpha = (unsigned char*)malloc(alphaSize);
1469         memcpy(alpha, GetAlpha(), alphaSize);
1470         image.InitAlpha();
1471         image.SetAlpha(alpha);
1472     }
1473
1474     return image;
1475 }
1476
1477 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
1478 {
1479     wxImage image;
1480
1481     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
1482
1483     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
1484
1485     unsigned char *data = image.GetData();
1486
1487     wxCHECK_MSG( data, image, wxT("unable to create image") );
1488
1489     if (M_IMGDATA->m_hasMask)
1490     {
1491         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
1492                                          M_IMGDATA->m_maskBlue == b)
1493             image.SetMaskColour( 255, 255, 255 );
1494         else
1495             image.SetMaskColour( 0, 0, 0 );
1496     }
1497
1498     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
1499
1500     unsigned char *srcd = M_IMGDATA->m_data;
1501     unsigned char *tard = image.GetData();
1502
1503     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
1504     {
1505         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
1506             tard[0] = tard[1] = tard[2] = 255;
1507         else
1508             tard[0] = tard[1] = tard[2] = 0;
1509     }
1510
1511     return image;
1512 }
1513
1514 int wxImage::GetWidth() const
1515 {
1516     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1517
1518     return M_IMGDATA->m_width;
1519 }
1520
1521 int wxImage::GetHeight() const
1522 {
1523     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1524
1525     return M_IMGDATA->m_height;
1526 }
1527
1528 wxBitmapType wxImage::GetType() const
1529 {
1530     wxCHECK_MSG( IsOk(), wxBITMAP_TYPE_INVALID, wxT("invalid image") );
1531
1532     return M_IMGDATA->m_type;
1533 }
1534
1535 void wxImage::SetType(wxBitmapType type)
1536 {
1537     wxCHECK_RET( IsOk(), "must create the image before setting its type");
1538
1539     // type can be wxBITMAP_TYPE_INVALID to reset the image type to default
1540     wxASSERT_MSG( type != wxBITMAP_TYPE_MAX, "invalid bitmap type" );
1541
1542     M_IMGDATA->m_type = type;
1543 }
1544
1545 long wxImage::XYToIndex(int x, int y) const
1546 {
1547     if ( Ok() &&
1548             x >= 0 && y >= 0 &&
1549                 x < M_IMGDATA->m_width && y < M_IMGDATA->m_height )
1550     {
1551         return y*M_IMGDATA->m_width + x;
1552     }
1553
1554     return -1;
1555 }
1556
1557 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
1558 {
1559     long pos = XYToIndex(x, y);
1560     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1561
1562     AllocExclusive();
1563
1564     pos *= 3;
1565
1566     M_IMGDATA->m_data[ pos   ] = r;
1567     M_IMGDATA->m_data[ pos+1 ] = g;
1568     M_IMGDATA->m_data[ pos+2 ] = b;
1569 }
1570
1571 void wxImage::SetRGB( const wxRect& rect_, unsigned char r, unsigned char g, unsigned char b )
1572 {
1573     wxCHECK_RET( Ok(), wxT("invalid image") );
1574
1575     AllocExclusive();
1576
1577     wxRect rect(rect_);
1578     wxRect imageRect(0, 0, GetWidth(), GetHeight());
1579     if ( rect == wxRect() )
1580     {
1581         rect = imageRect;
1582     }
1583     else
1584     {
1585         wxCHECK_RET( imageRect.Contains(rect.GetTopLeft()) &&
1586                      imageRect.Contains(rect.GetBottomRight()),
1587                      wxT("invalid bounding rectangle") );
1588     }
1589
1590     int x1 = rect.GetLeft(),
1591         y1 = rect.GetTop(),
1592         x2 = rect.GetRight() + 1,
1593         y2 = rect.GetBottom() + 1;
1594
1595     unsigned char *data wxDUMMY_INITIALIZE(NULL);
1596     int x, y, width = GetWidth();
1597     for (y = y1; y < y2; y++)
1598     {
1599         data = M_IMGDATA->m_data + (y*width + x1)*3;
1600         for (x = x1; x < x2; x++)
1601         {
1602             *data++ = r;
1603             *data++ = g;
1604             *data++ = b;
1605         }
1606     }
1607 }
1608
1609 unsigned char wxImage::GetRed( int x, int y ) const
1610 {
1611     long pos = XYToIndex(x, y);
1612     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1613
1614     pos *= 3;
1615
1616     return M_IMGDATA->m_data[pos];
1617 }
1618
1619 unsigned char wxImage::GetGreen( int x, int y ) const
1620 {
1621     long pos = XYToIndex(x, y);
1622     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1623
1624     pos *= 3;
1625
1626     return M_IMGDATA->m_data[pos+1];
1627 }
1628
1629 unsigned char wxImage::GetBlue( int x, int y ) const
1630 {
1631     long pos = XYToIndex(x, y);
1632     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1633
1634     pos *= 3;
1635
1636     return M_IMGDATA->m_data[pos+2];
1637 }
1638
1639 bool wxImage::IsOk() const
1640 {
1641     // image of 0 width or height can't be considered ok - at least because it
1642     // causes crashes in ConvertToBitmap() if we don't catch it in time
1643     wxImageRefData *data = M_IMGDATA;
1644     return data && data->m_ok && data->m_width && data->m_height;
1645 }
1646
1647 unsigned char *wxImage::GetData() const
1648 {
1649     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1650
1651     return M_IMGDATA->m_data;
1652 }
1653
1654 void wxImage::SetData( unsigned char *data, bool static_data  )
1655 {
1656     wxCHECK_RET( Ok(), wxT("invalid image") );
1657
1658     wxImageRefData *newRefData = new wxImageRefData();
1659
1660     newRefData->m_width = M_IMGDATA->m_width;
1661     newRefData->m_height = M_IMGDATA->m_height;
1662     newRefData->m_data = data;
1663     newRefData->m_ok = true;
1664     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1665     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1666     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1667     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1668     newRefData->m_static = static_data;
1669
1670     UnRef();
1671
1672     m_refData = newRefData;
1673 }
1674
1675 void wxImage::SetData( unsigned char *data, int new_width, int new_height, bool static_data )
1676 {
1677     wxImageRefData *newRefData = new wxImageRefData();
1678
1679     if (m_refData)
1680     {
1681         newRefData->m_width = new_width;
1682         newRefData->m_height = new_height;
1683         newRefData->m_data = data;
1684         newRefData->m_ok = true;
1685         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
1686         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
1687         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
1688         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
1689     }
1690     else
1691     {
1692         newRefData->m_width = new_width;
1693         newRefData->m_height = new_height;
1694         newRefData->m_data = data;
1695         newRefData->m_ok = true;
1696     }
1697     newRefData->m_static = static_data;
1698
1699     UnRef();
1700
1701     m_refData = newRefData;
1702 }
1703
1704 // ----------------------------------------------------------------------------
1705 // alpha channel support
1706 // ----------------------------------------------------------------------------
1707
1708 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
1709 {
1710     wxCHECK_RET( HasAlpha(), wxT("no alpha channel") );
1711
1712     long pos = XYToIndex(x, y);
1713     wxCHECK_RET( pos != -1, wxT("invalid image coordinates") );
1714
1715     AllocExclusive();
1716
1717     M_IMGDATA->m_alpha[pos] = alpha;
1718 }
1719
1720 unsigned char wxImage::GetAlpha(int x, int y) const
1721 {
1722     wxCHECK_MSG( HasAlpha(), 0, wxT("no alpha channel") );
1723
1724     long pos = XYToIndex(x, y);
1725     wxCHECK_MSG( pos != -1, 0, wxT("invalid image coordinates") );
1726
1727     return M_IMGDATA->m_alpha[pos];
1728 }
1729
1730 bool
1731 wxImage::ConvertColourToAlpha(unsigned char r, unsigned char g, unsigned char b)
1732 {
1733     SetAlpha(NULL);
1734
1735     const int w = M_IMGDATA->m_width;
1736     const int h = M_IMGDATA->m_height;
1737
1738     unsigned char *alpha = GetAlpha();
1739     unsigned char *data = GetData();
1740
1741     for ( int y = 0; y < h; y++ )
1742     {
1743         for ( int x = 0; x < w; x++ )
1744         {
1745             *alpha++ = *data;
1746             *data++ = r;
1747             *data++ = g;
1748             *data++ = b;
1749         }
1750     }
1751
1752     return true;
1753 }
1754
1755 void wxImage::SetAlpha( unsigned char *alpha, bool static_data )
1756 {
1757     wxCHECK_RET( Ok(), wxT("invalid image") );
1758
1759     AllocExclusive();
1760
1761     if ( !alpha )
1762     {
1763         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
1764     }
1765
1766     if( !M_IMGDATA->m_staticAlpha )
1767         free(M_IMGDATA->m_alpha);
1768
1769     M_IMGDATA->m_alpha = alpha;
1770     M_IMGDATA->m_staticAlpha = static_data;
1771 }
1772
1773 unsigned char *wxImage::GetAlpha() const
1774 {
1775     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
1776
1777     return M_IMGDATA->m_alpha;
1778 }
1779
1780 void wxImage::InitAlpha()
1781 {
1782     wxCHECK_RET( !HasAlpha(), wxT("image already has an alpha channel") );
1783
1784     // initialize memory for alpha channel
1785     SetAlpha();
1786
1787     unsigned char *alpha = M_IMGDATA->m_alpha;
1788     const size_t lenAlpha = M_IMGDATA->m_width * M_IMGDATA->m_height;
1789
1790     if ( HasMask() )
1791     {
1792         // use the mask to initialize the alpha channel.
1793         const unsigned char * const alphaEnd = alpha + lenAlpha;
1794
1795         const unsigned char mr = M_IMGDATA->m_maskRed;
1796         const unsigned char mg = M_IMGDATA->m_maskGreen;
1797         const unsigned char mb = M_IMGDATA->m_maskBlue;
1798         for ( unsigned char *src = M_IMGDATA->m_data;
1799               alpha < alphaEnd;
1800               src += 3, alpha++ )
1801         {
1802             *alpha = (src[0] == mr && src[1] == mg && src[2] == mb)
1803                             ? wxIMAGE_ALPHA_TRANSPARENT
1804                             : wxIMAGE_ALPHA_OPAQUE;
1805         }
1806
1807         M_IMGDATA->m_hasMask = false;
1808     }
1809     else // no mask
1810     {
1811         // make the image fully opaque
1812         memset(alpha, wxIMAGE_ALPHA_OPAQUE, lenAlpha);
1813     }
1814 }
1815
1816 // ----------------------------------------------------------------------------
1817 // mask support
1818 // ----------------------------------------------------------------------------
1819
1820 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
1821 {
1822     wxCHECK_RET( Ok(), wxT("invalid image") );
1823
1824     AllocExclusive();
1825
1826     M_IMGDATA->m_maskRed = r;
1827     M_IMGDATA->m_maskGreen = g;
1828     M_IMGDATA->m_maskBlue = b;
1829     M_IMGDATA->m_hasMask = true;
1830 }
1831
1832 bool wxImage::GetOrFindMaskColour( unsigned char *r, unsigned char *g, unsigned char *b ) const
1833 {
1834     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1835
1836     if (M_IMGDATA->m_hasMask)
1837     {
1838         if (r) *r = M_IMGDATA->m_maskRed;
1839         if (g) *g = M_IMGDATA->m_maskGreen;
1840         if (b) *b = M_IMGDATA->m_maskBlue;
1841         return true;
1842     }
1843     else
1844     {
1845         FindFirstUnusedColour(r, g, b);
1846         return false;
1847     }
1848 }
1849
1850 unsigned char wxImage::GetMaskRed() const
1851 {
1852     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1853
1854     return M_IMGDATA->m_maskRed;
1855 }
1856
1857 unsigned char wxImage::GetMaskGreen() const
1858 {
1859     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1860
1861     return M_IMGDATA->m_maskGreen;
1862 }
1863
1864 unsigned char wxImage::GetMaskBlue() const
1865 {
1866     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
1867
1868     return M_IMGDATA->m_maskBlue;
1869 }
1870
1871 void wxImage::SetMask( bool mask )
1872 {
1873     wxCHECK_RET( Ok(), wxT("invalid image") );
1874
1875     AllocExclusive();
1876
1877     M_IMGDATA->m_hasMask = mask;
1878 }
1879
1880 bool wxImage::HasMask() const
1881 {
1882     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1883
1884     return M_IMGDATA->m_hasMask;
1885 }
1886
1887 bool wxImage::IsTransparent(int x, int y, unsigned char threshold) const
1888 {
1889     long pos = XYToIndex(x, y);
1890     wxCHECK_MSG( pos != -1, false, wxT("invalid image coordinates") );
1891
1892     // check mask
1893     if ( M_IMGDATA->m_hasMask )
1894     {
1895         const unsigned char *p = M_IMGDATA->m_data + 3*pos;
1896         if ( p[0] == M_IMGDATA->m_maskRed &&
1897                 p[1] == M_IMGDATA->m_maskGreen &&
1898                     p[2] == M_IMGDATA->m_maskBlue )
1899         {
1900             return true;
1901         }
1902     }
1903
1904     // then check alpha
1905     if ( M_IMGDATA->m_alpha )
1906     {
1907         if ( M_IMGDATA->m_alpha[pos] < threshold )
1908         {
1909             // transparent enough
1910             return true;
1911         }
1912     }
1913
1914     // not transparent
1915     return false;
1916 }
1917
1918 bool wxImage::SetMaskFromImage(const wxImage& mask,
1919                                unsigned char mr, unsigned char mg, unsigned char mb)
1920 {
1921     // check that the images are the same size
1922     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
1923     {
1924         wxLogError( _("Image and mask have different sizes.") );
1925         return false;
1926     }
1927
1928     // find unused colour
1929     unsigned char r,g,b ;
1930     if (!FindFirstUnusedColour(&r, &g, &b))
1931     {
1932         wxLogError( _("No unused colour in image being masked.") );
1933         return false ;
1934     }
1935
1936     AllocExclusive();
1937
1938     unsigned char *imgdata = GetData();
1939     unsigned char *maskdata = mask.GetData();
1940
1941     const int w = GetWidth();
1942     const int h = GetHeight();
1943
1944     for (int j = 0; j < h; j++)
1945     {
1946         for (int i = 0; i < w; i++)
1947         {
1948             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1949             {
1950                 imgdata[0] = r;
1951                 imgdata[1] = g;
1952                 imgdata[2] = b;
1953             }
1954             imgdata  += 3;
1955             maskdata += 3;
1956         }
1957     }
1958
1959     SetMaskColour(r, g, b);
1960     SetMask(true);
1961
1962     return true;
1963 }
1964
1965 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1966 {
1967     if ( !HasAlpha() )
1968         return true;
1969
1970     unsigned char mr, mg, mb;
1971     if ( !FindFirstUnusedColour(&mr, &mg, &mb) )
1972     {
1973         wxLogError( _("No unused colour in image being masked.") );
1974         return false;
1975     }
1976
1977     ConvertAlphaToMask(mr, mg, mb, threshold);
1978     return true;
1979 }
1980
1981 void wxImage::ConvertAlphaToMask(unsigned char mr,
1982                                  unsigned char mg,
1983                                  unsigned char mb,
1984                                  unsigned char threshold)
1985 {
1986     if ( !HasAlpha() )
1987         return;
1988
1989     AllocExclusive();
1990
1991     SetMask(true);
1992     SetMaskColour(mr, mg, mb);
1993
1994     unsigned char *imgdata = GetData();
1995     unsigned char *alphadata = GetAlpha();
1996
1997     int w = GetWidth();
1998     int h = GetHeight();
1999
2000     for (int y = 0; y < h; y++)
2001     {
2002         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
2003         {
2004             if (*alphadata < threshold)
2005             {
2006                 imgdata[0] = mr;
2007                 imgdata[1] = mg;
2008                 imgdata[2] = mb;
2009             }
2010         }
2011     }
2012
2013     if ( !M_IMGDATA->m_staticAlpha )
2014         free(M_IMGDATA->m_alpha);
2015
2016     M_IMGDATA->m_alpha = NULL;
2017     M_IMGDATA->m_staticAlpha = false;
2018 }
2019
2020 // ----------------------------------------------------------------------------
2021 // Palette functions
2022 // ----------------------------------------------------------------------------
2023
2024 #if wxUSE_PALETTE
2025
2026 bool wxImage::HasPalette() const
2027 {
2028     if (!Ok())
2029         return false;
2030
2031     return M_IMGDATA->m_palette.Ok();
2032 }
2033
2034 const wxPalette& wxImage::GetPalette() const
2035 {
2036     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
2037
2038     return M_IMGDATA->m_palette;
2039 }
2040
2041 void wxImage::SetPalette(const wxPalette& palette)
2042 {
2043     wxCHECK_RET( Ok(), wxT("invalid image") );
2044
2045     AllocExclusive();
2046
2047     M_IMGDATA->m_palette = palette;
2048 }
2049
2050 #endif // wxUSE_PALETTE
2051
2052 // ----------------------------------------------------------------------------
2053 // Option functions (arbitrary name/value mapping)
2054 // ----------------------------------------------------------------------------
2055
2056 void wxImage::SetOption(const wxString& name, const wxString& value)
2057 {
2058     AllocExclusive();
2059
2060     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2061     if ( idx == wxNOT_FOUND )
2062     {
2063         M_IMGDATA->m_optionNames.Add(name);
2064         M_IMGDATA->m_optionValues.Add(value);
2065     }
2066     else
2067     {
2068         M_IMGDATA->m_optionNames[idx] = name;
2069         M_IMGDATA->m_optionValues[idx] = value;
2070     }
2071 }
2072
2073 void wxImage::SetOption(const wxString& name, int value)
2074 {
2075     wxString valStr;
2076     valStr.Printf(wxT("%d"), value);
2077     SetOption(name, valStr);
2078 }
2079
2080 wxString wxImage::GetOption(const wxString& name) const
2081 {
2082     if ( !M_IMGDATA )
2083         return wxEmptyString;
2084
2085     int idx = M_IMGDATA->m_optionNames.Index(name, false);
2086     if ( idx == wxNOT_FOUND )
2087         return wxEmptyString;
2088     else
2089         return M_IMGDATA->m_optionValues[idx];
2090 }
2091
2092 int wxImage::GetOptionInt(const wxString& name) const
2093 {
2094     return wxAtoi(GetOption(name));
2095 }
2096
2097 bool wxImage::HasOption(const wxString& name) const
2098 {
2099     return M_IMGDATA ? M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND
2100                      : false;
2101 }
2102
2103 // ----------------------------------------------------------------------------
2104 // image I/O
2105 // ----------------------------------------------------------------------------
2106
2107 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2108                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type),
2109                         int WXUNUSED_UNLESS_STREAMS(index) )
2110 {
2111 #if HAS_FILE_STREAMS
2112     if (wxFileExists(filename))
2113     {
2114         wxImageFileInputStream stream(filename);
2115         wxBufferedInputStream bstream( stream );
2116         return LoadFile(bstream, type, index);
2117     }
2118     else
2119     {
2120         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2121
2122         return false;
2123     }
2124 #else // !HAS_FILE_STREAMS
2125     return false;
2126 #endif // HAS_FILE_STREAMS
2127 }
2128
2129 bool wxImage::LoadFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2130                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype),
2131                         int WXUNUSED_UNLESS_STREAMS(index) )
2132 {
2133 #if HAS_FILE_STREAMS
2134     if (wxFileExists(filename))
2135     {
2136         wxImageFileInputStream stream(filename);
2137         wxBufferedInputStream bstream( stream );
2138         return LoadFile(bstream, mimetype, index);
2139     }
2140     else
2141     {
2142         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
2143
2144         return false;
2145     }
2146 #else // !HAS_FILE_STREAMS
2147     return false;
2148 #endif // HAS_FILE_STREAMS
2149 }
2150
2151
2152 bool wxImage::SaveFile( const wxString& filename ) const
2153 {
2154     wxString ext = filename.AfterLast('.').Lower();
2155
2156     wxImageHandler *handler = FindHandler(ext, wxBITMAP_TYPE_ANY);
2157     if ( !handler)
2158     {
2159        wxLogError(_("Can't save image to file '%s': unknown extension."),
2160                   filename);
2161        return false;
2162     }
2163
2164     return SaveFile(filename, handler->GetType());
2165 }
2166
2167 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2168                         wxBitmapType WXUNUSED_UNLESS_STREAMS(type) ) const
2169 {
2170 #if HAS_FILE_STREAMS
2171     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2172
2173     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2174
2175     wxImageFileOutputStream stream(filename);
2176
2177     if ( stream.IsOk() )
2178     {
2179         wxBufferedOutputStream bstream( stream );
2180         return SaveFile(bstream, type);
2181     }
2182 #endif // HAS_FILE_STREAMS
2183
2184     return false;
2185 }
2186
2187 bool wxImage::SaveFile( const wxString& WXUNUSED_UNLESS_STREAMS(filename),
2188                         const wxString& WXUNUSED_UNLESS_STREAMS(mimetype) ) const
2189 {
2190 #if HAS_FILE_STREAMS
2191     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2192
2193     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
2194
2195     wxImageFileOutputStream stream(filename);
2196
2197     if ( stream.IsOk() )
2198     {
2199         wxBufferedOutputStream bstream( stream );
2200         return SaveFile(bstream, mimetype);
2201     }
2202 #endif // HAS_FILE_STREAMS
2203
2204     return false;
2205 }
2206
2207 bool wxImage::CanRead( const wxString& WXUNUSED_UNLESS_STREAMS(name) )
2208 {
2209 #if HAS_FILE_STREAMS
2210     wxImageFileInputStream stream(name);
2211     return CanRead(stream);
2212 #else
2213     return false;
2214 #endif
2215 }
2216
2217 int wxImage::GetImageCount( const wxString& WXUNUSED_UNLESS_STREAMS(name),
2218                             wxBitmapType WXUNUSED_UNLESS_STREAMS(type) )
2219 {
2220 #if HAS_FILE_STREAMS
2221     wxImageFileInputStream stream(name);
2222     if (stream.Ok())
2223         return GetImageCount(stream, type);
2224 #endif
2225
2226   return 0;
2227 }
2228
2229 #if wxUSE_STREAMS
2230
2231 bool wxImage::CanRead( wxInputStream &stream )
2232 {
2233     const wxList& list = GetHandlers();
2234
2235     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
2236     {
2237         wxImageHandler *handler=(wxImageHandler*)node->GetData();
2238         if (handler->CanRead( stream ))
2239             return true;
2240     }
2241
2242     return false;
2243 }
2244
2245 int wxImage::GetImageCount( wxInputStream &stream, wxBitmapType type )
2246 {
2247     wxImageHandler *handler;
2248
2249     if ( type == wxBITMAP_TYPE_ANY )
2250     {
2251         const wxList& list = GetHandlers();
2252
2253         for ( wxList::compatibility_iterator node = list.GetFirst();
2254               node;
2255               node = node->GetNext() )
2256         {
2257              handler = (wxImageHandler*)node->GetData();
2258              if ( handler->CanRead(stream) )
2259              {
2260                  const int count = handler->GetImageCount(stream);
2261                  if ( count >= 0 )
2262                      return count;
2263              }
2264
2265         }
2266
2267         wxLogWarning(_("No handler found for image type."));
2268         return 0;
2269     }
2270
2271     handler = FindHandler(type);
2272
2273     if ( !handler )
2274     {
2275         wxLogWarning(_("No image handler for type %ld defined."), type);
2276         return false;
2277     }
2278
2279     if ( handler->CanRead(stream) )
2280     {
2281         return handler->GetImageCount(stream);
2282     }
2283     else
2284     {
2285         wxLogError(_("Image file is not of type %ld."), type);
2286         return 0;
2287     }
2288 }
2289
2290 bool wxImage::DoLoad(wxImageHandler& handler, wxInputStream& stream, int index)
2291 {
2292     // save the options values which can be clobbered by the handler (e.g. many
2293     // of them call Destroy() before trying to load the file)
2294     const unsigned maxWidth = GetOptionInt(wxIMAGE_OPTION_MAX_WIDTH),
2295                    maxHeight = GetOptionInt(wxIMAGE_OPTION_MAX_HEIGHT);
2296
2297     if ( !handler.LoadFile(this, stream, true/*verbose*/, index) )
2298         return false;
2299
2300     M_IMGDATA->m_type = handler.GetType();
2301
2302     // rescale the image to the specified size if needed
2303     if ( maxWidth || maxHeight )
2304     {
2305         const unsigned widthOrig = GetWidth(),
2306                        heightOrig = GetHeight();
2307
2308         // this uses the same (trivial) algorithm as the JPEG handler
2309         unsigned width = widthOrig,
2310                  height = heightOrig;
2311         while ( (maxWidth && width > maxWidth) ||
2312                     (maxHeight && height > maxHeight) )
2313         {
2314             width /= 2;
2315             height /= 2;
2316         }
2317
2318         if ( width != widthOrig || height != heightOrig )
2319             Rescale(width, height, wxIMAGE_QUALITY_HIGH);
2320     }
2321
2322     return true;
2323 }
2324
2325 bool wxImage::LoadFile( wxInputStream& stream, wxBitmapType type, int index )
2326 {
2327     AllocExclusive();
2328
2329     wxImageHandler *handler;
2330
2331     if ( type == wxBITMAP_TYPE_ANY )
2332     {
2333         const wxList& list = GetHandlers();
2334         for ( wxList::compatibility_iterator node = list.GetFirst();
2335               node;
2336               node = node->GetNext() )
2337         {
2338              handler = (wxImageHandler*)node->GetData();
2339              if ( handler->CanRead(stream) && DoLoad(*handler, stream, index) )
2340                  return true;
2341         }
2342
2343         wxLogWarning( _("No handler found for image type.") );
2344
2345         return false;
2346     }
2347     //else: have specific type
2348
2349     handler = FindHandler(type);
2350     if ( !handler )
2351     {
2352         wxLogWarning( _("No image handler for type %ld defined."), type );
2353         return false;
2354     }
2355
2356     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2357     {
2358         wxLogError(_("Image file is not of type %ld."), type);
2359         return false;
2360     }
2361
2362     return DoLoad(*handler, stream, index);
2363 }
2364
2365 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
2366 {
2367     UnRef();
2368
2369     m_refData = new wxImageRefData;
2370
2371     wxImageHandler *handler = FindHandlerMime(mimetype);
2372
2373     if ( !handler )
2374     {
2375         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2376         return false;
2377     }
2378
2379     if ( stream.IsSeekable() && !handler->CanRead(stream) )
2380     {
2381         wxLogError(_("Image file is not of type %s."), mimetype);
2382         return false;
2383     }
2384
2385     return DoLoad(*handler, stream, index);
2386 }
2387
2388 bool wxImage::DoSave(wxImageHandler& handler, wxOutputStream& stream) const
2389 {
2390     wxImage * const self = const_cast<wxImage *>(this);
2391     if ( !handler.SaveFile(self, stream) )
2392         return false;
2393
2394     M_IMGDATA->m_type = handler.GetType();
2395     return true;
2396 }
2397
2398 bool wxImage::SaveFile( wxOutputStream& stream, wxBitmapType type ) const
2399 {
2400     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2401
2402     wxImageHandler *handler = FindHandler(type);
2403     if ( !handler )
2404     {
2405         wxLogWarning( _("No image handler for type %d defined."), type );
2406         return false;
2407     }
2408
2409     return DoSave(*handler, stream);
2410 }
2411
2412 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
2413 {
2414     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
2415
2416     wxImageHandler *handler = FindHandlerMime(mimetype);
2417     if ( !handler )
2418     {
2419         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
2420     }
2421
2422     return DoSave(*handler, stream);
2423 }
2424
2425 #endif // wxUSE_STREAMS
2426
2427 // ----------------------------------------------------------------------------
2428 // image I/O handlers
2429 // ----------------------------------------------------------------------------
2430
2431 void wxImage::AddHandler( wxImageHandler *handler )
2432 {
2433     // Check for an existing handler of the type being added.
2434     if (FindHandler( handler->GetType() ) == 0)
2435     {
2436         sm_handlers.Append( handler );
2437     }
2438     else
2439     {
2440         // This is not documented behaviour, merely the simplest 'fix'
2441         // for preventing duplicate additions.  If someone ever has
2442         // a good reason to add and remove duplicate handlers (and they
2443         // may) we should probably refcount the duplicates.
2444         //   also an issue in InsertHandler below.
2445
2446         wxLogDebug( wxT("Adding duplicate image handler for '%s'"),
2447                     handler->GetName().c_str() );
2448         delete handler;
2449     }
2450 }
2451
2452 void wxImage::InsertHandler( wxImageHandler *handler )
2453 {
2454     // Check for an existing handler of the type being added.
2455     if (FindHandler( handler->GetType() ) == 0)
2456     {
2457         sm_handlers.Insert( handler );
2458     }
2459     else
2460     {
2461         // see AddHandler for additional comments.
2462         wxLogDebug( wxT("Inserting duplicate image handler for '%s'"),
2463                     handler->GetName().c_str() );
2464         delete handler;
2465     }
2466 }
2467
2468 bool wxImage::RemoveHandler( const wxString& name )
2469 {
2470     wxImageHandler *handler = FindHandler(name);
2471     if (handler)
2472     {
2473         sm_handlers.DeleteObject(handler);
2474         delete handler;
2475         return true;
2476     }
2477     else
2478         return false;
2479 }
2480
2481 wxImageHandler *wxImage::FindHandler( const wxString& name )
2482 {
2483     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2484     while (node)
2485     {
2486         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2487         if (handler->GetName().Cmp(name) == 0) return handler;
2488
2489         node = node->GetNext();
2490     }
2491     return NULL;
2492 }
2493
2494 wxImageHandler *wxImage::FindHandler( const wxString& extension, wxBitmapType bitmapType )
2495 {
2496     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2497     while (node)
2498     {
2499         wxImageHandler *handler = (wxImageHandler*)node->GetData();
2500         if ((bitmapType == wxBITMAP_TYPE_ANY) || (handler->GetType() == bitmapType))
2501         {
2502             if (handler->GetExtension() == extension)
2503                 return handler;
2504             if (handler->GetAltExtensions().Index(extension, false) != wxNOT_FOUND)
2505                 return handler;
2506         }
2507         node = node->GetNext();
2508     }
2509     return NULL;
2510 }
2511
2512 wxImageHandler *wxImage::FindHandler(wxBitmapType bitmapType )
2513 {
2514     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2515     while (node)
2516     {
2517         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2518         if (handler->GetType() == bitmapType) return handler;
2519         node = node->GetNext();
2520     }
2521     return NULL;
2522 }
2523
2524 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
2525 {
2526     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2527     while (node)
2528     {
2529         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2530         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
2531         node = node->GetNext();
2532     }
2533     return NULL;
2534 }
2535
2536 void wxImage::InitStandardHandlers()
2537 {
2538 #if wxUSE_STREAMS
2539     AddHandler(new wxBMPHandler);
2540 #endif // wxUSE_STREAMS
2541 }
2542
2543 void wxImage::CleanUpHandlers()
2544 {
2545     wxList::compatibility_iterator node = sm_handlers.GetFirst();
2546     while (node)
2547     {
2548         wxImageHandler *handler = (wxImageHandler *)node->GetData();
2549         wxList::compatibility_iterator next = node->GetNext();
2550         delete handler;
2551         node = next;
2552     }
2553
2554     sm_handlers.Clear();
2555 }
2556
2557 wxString wxImage::GetImageExtWildcard()
2558 {
2559     wxString fmts;
2560
2561     wxList& Handlers = wxImage::GetHandlers();
2562     wxList::compatibility_iterator Node = Handlers.GetFirst();
2563     while ( Node )
2564     {
2565         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
2566         fmts += wxT("*.") + Handler->GetExtension();
2567         for (size_t i = 0; i < Handler->GetAltExtensions().size(); i++)
2568             fmts += wxT(";*.") + Handler->GetAltExtensions()[i];
2569         Node = Node->GetNext();
2570         if ( Node ) fmts += wxT(";");
2571     }
2572
2573     return wxT("(") + fmts + wxT(")|") + fmts;
2574 }
2575
2576 wxImage::HSVValue wxImage::RGBtoHSV(const RGBValue& rgb)
2577 {
2578     const double red = rgb.red / 255.0,
2579                  green = rgb.green / 255.0,
2580                  blue = rgb.blue / 255.0;
2581
2582     // find the min and max intensity (and remember which one was it for the
2583     // latter)
2584     double minimumRGB = red;
2585     if ( green < minimumRGB )
2586         minimumRGB = green;
2587     if ( blue < minimumRGB )
2588         minimumRGB = blue;
2589
2590     enum { RED, GREEN, BLUE } chMax = RED;
2591     double maximumRGB = red;
2592     if ( green > maximumRGB )
2593     {
2594         chMax = GREEN;
2595         maximumRGB = green;
2596     }
2597     if ( blue > maximumRGB )
2598     {
2599         chMax = BLUE;
2600         maximumRGB = blue;
2601     }
2602
2603     const double value = maximumRGB;
2604
2605     double hue = 0.0, saturation;
2606     const double deltaRGB = maximumRGB - minimumRGB;
2607     if ( wxIsNullDouble(deltaRGB) )
2608     {
2609         // Gray has no color
2610         hue = 0.0;
2611         saturation = 0.0;
2612     }
2613     else
2614     {
2615         switch ( chMax )
2616         {
2617             case RED:
2618                 hue = (green - blue) / deltaRGB;
2619                 break;
2620
2621             case GREEN:
2622                 hue = 2.0 + (blue - red) / deltaRGB;
2623                 break;
2624
2625             case BLUE:
2626                 hue = 4.0 + (red - green) / deltaRGB;
2627                 break;
2628
2629             default:
2630                 wxFAIL_MSG(wxT("hue not specified"));
2631                 break;
2632         }
2633
2634         hue /= 6.0;
2635
2636         if ( hue < 0.0 )
2637             hue += 1.0;
2638
2639         saturation = deltaRGB / maximumRGB;
2640     }
2641
2642     return HSVValue(hue, saturation, value);
2643 }
2644
2645 wxImage::RGBValue wxImage::HSVtoRGB(const HSVValue& hsv)
2646 {
2647     double red, green, blue;
2648
2649     if ( wxIsNullDouble(hsv.saturation) )
2650     {
2651         // Grey
2652         red = hsv.value;
2653         green = hsv.value;
2654         blue = hsv.value;
2655     }
2656     else // not grey
2657     {
2658         double hue = hsv.hue * 6.0;      // sector 0 to 5
2659         int i = (int)floor(hue);
2660         double f = hue - i;          // fractional part of h
2661         double p = hsv.value * (1.0 - hsv.saturation);
2662
2663         switch (i)
2664         {
2665             case 0:
2666                 red = hsv.value;
2667                 green = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2668                 blue = p;
2669                 break;
2670
2671             case 1:
2672                 red = hsv.value * (1.0 - hsv.saturation * f);
2673                 green = hsv.value;
2674                 blue = p;
2675                 break;
2676
2677             case 2:
2678                 red = p;
2679                 green = hsv.value;
2680                 blue = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2681                 break;
2682
2683             case 3:
2684                 red = p;
2685                 green = hsv.value * (1.0 - hsv.saturation * f);
2686                 blue = hsv.value;
2687                 break;
2688
2689             case 4:
2690                 red = hsv.value * (1.0 - hsv.saturation * (1.0 - f));
2691                 green = p;
2692                 blue = hsv.value;
2693                 break;
2694
2695             default:    // case 5:
2696                 red = hsv.value;
2697                 green = p;
2698                 blue = hsv.value * (1.0 - hsv.saturation * f);
2699                 break;
2700         }
2701     }
2702
2703     return RGBValue((unsigned char)(red * 255.0),
2704                     (unsigned char)(green * 255.0),
2705                     (unsigned char)(blue * 255.0));
2706 }
2707
2708 /*
2709  * Rotates the hue of each pixel of the image. angle is a double in the range
2710  * -1.0..1.0 where -1.0 is -360 degrees and 1.0 is 360 degrees
2711  */
2712 void wxImage::RotateHue(double angle)
2713 {
2714     AllocExclusive();
2715
2716     unsigned char *srcBytePtr;
2717     unsigned char *dstBytePtr;
2718     unsigned long count;
2719     wxImage::HSVValue hsv;
2720     wxImage::RGBValue rgb;
2721
2722     wxASSERT (angle >= -1.0 && angle <= 1.0);
2723     count = M_IMGDATA->m_width * M_IMGDATA->m_height;
2724     if ( count > 0 && !wxIsNullDouble(angle) )
2725     {
2726         srcBytePtr = M_IMGDATA->m_data;
2727         dstBytePtr = srcBytePtr;
2728         do
2729         {
2730             rgb.red = *srcBytePtr++;
2731             rgb.green = *srcBytePtr++;
2732             rgb.blue = *srcBytePtr++;
2733             hsv = RGBtoHSV(rgb);
2734
2735             hsv.hue = hsv.hue + angle;
2736             if (hsv.hue > 1.0)
2737                 hsv.hue = hsv.hue - 1.0;
2738             else if (hsv.hue < 0.0)
2739                 hsv.hue = hsv.hue + 1.0;
2740
2741             rgb = HSVtoRGB(hsv);
2742             *dstBytePtr++ = rgb.red;
2743             *dstBytePtr++ = rgb.green;
2744             *dstBytePtr++ = rgb.blue;
2745         } while (--count != 0);
2746     }
2747 }
2748
2749 //-----------------------------------------------------------------------------
2750 // wxImageHandler
2751 //-----------------------------------------------------------------------------
2752
2753 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
2754
2755 #if wxUSE_STREAMS
2756 int wxImageHandler::GetImageCount( wxInputStream& stream )
2757 {
2758     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2759     //       wxImageHandler::CallDoCanRead
2760
2761     if ( !stream.IsSeekable() )
2762         return false;        // can't test unseekable stream
2763
2764     wxFileOffset posOld = stream.TellI();
2765     int n = DoGetImageCount(stream);
2766
2767     // restore the old position to be able to test other formats and so on
2768     if ( stream.SeekI(posOld) == wxInvalidOffset )
2769     {
2770         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2771
2772         // reading would fail anyhow as we're not at the right position
2773         return false;
2774     }
2775
2776     return n;
2777 }
2778
2779 bool wxImageHandler::CanRead( const wxString& name )
2780 {
2781     if (wxFileExists(name))
2782     {
2783         wxImageFileInputStream stream(name);
2784         return CanRead(stream);
2785     }
2786
2787     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
2788
2789     return false;
2790 }
2791
2792 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
2793 {
2794     // NOTE: this code is the same of wxAnimationDecoder::CanRead and
2795     //       wxImageHandler::GetImageCount
2796
2797     if ( !stream.IsSeekable() )
2798         return false;        // can't test unseekable stream
2799
2800     wxFileOffset posOld = stream.TellI();
2801     bool ok = DoCanRead(stream);
2802
2803     // restore the old position to be able to test other formats and so on
2804     if ( stream.SeekI(posOld) == wxInvalidOffset )
2805     {
2806         wxLogDebug(wxT("Failed to rewind the stream in wxImageHandler!"));
2807
2808         // reading would fail anyhow as we're not at the right position
2809         return false;
2810     }
2811
2812     return ok;
2813 }
2814
2815 #endif // wxUSE_STREAMS
2816
2817 /* static */
2818 wxImageResolution
2819 wxImageHandler::GetResolutionFromOptions(const wxImage& image, int *x, int *y)
2820 {
2821     wxCHECK_MSG( x && y, wxIMAGE_RESOLUTION_NONE, wxT("NULL pointer") );
2822
2823     if ( image.HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
2824          image.HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
2825     {
2826         *x = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX);
2827         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY);
2828     }
2829     else if ( image.HasOption(wxIMAGE_OPTION_RESOLUTION) )
2830     {
2831         *x =
2832         *y = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTION);
2833     }
2834     else // no resolution options specified
2835     {
2836         *x =
2837         *y = 0;
2838
2839         return wxIMAGE_RESOLUTION_NONE;
2840     }
2841
2842     // get the resolution unit too
2843     int resUnit = image.GetOptionInt(wxIMAGE_OPTION_RESOLUTIONUNIT);
2844     if ( !resUnit )
2845     {
2846         // this is the default
2847         resUnit = wxIMAGE_RESOLUTION_INCHES;
2848     }
2849
2850     return (wxImageResolution)resUnit;
2851 }
2852
2853 // ----------------------------------------------------------------------------
2854 // image histogram stuff
2855 // ----------------------------------------------------------------------------
2856
2857 bool
2858 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
2859                                         unsigned char *g,
2860                                         unsigned char *b,
2861                                         unsigned char r2,
2862                                         unsigned char b2,
2863                                         unsigned char g2) const
2864 {
2865     unsigned long key = MakeKey(r2, g2, b2);
2866
2867     while ( find(key) != end() )
2868     {
2869         // color already used
2870         r2++;
2871         if ( r2 >= 255 )
2872         {
2873             r2 = 0;
2874             g2++;
2875             if ( g2 >= 255 )
2876             {
2877                 g2 = 0;
2878                 b2++;
2879                 if ( b2 >= 255 )
2880                 {
2881                     wxLogError(_("No unused colour in image.") );
2882                     return false;
2883                 }
2884             }
2885         }
2886
2887         key = MakeKey(r2, g2, b2);
2888     }
2889
2890     if ( r )
2891         *r = r2;
2892     if ( g )
2893         *g = g2;
2894     if ( b )
2895         *b = b2;
2896
2897     return true;
2898 }
2899
2900 bool
2901 wxImage::FindFirstUnusedColour(unsigned char *r,
2902                                unsigned char *g,
2903                                unsigned char *b,
2904                                unsigned char r2,
2905                                unsigned char b2,
2906                                unsigned char g2) const
2907 {
2908     wxImageHistogram histogram;
2909
2910     ComputeHistogram(histogram);
2911
2912     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
2913 }
2914
2915
2916
2917 // GRG, Dic/99
2918 // Counts and returns the number of different colours. Optionally stops
2919 // when it exceeds 'stopafter' different colours. This is useful, for
2920 // example, to see if the image can be saved as 8-bit (256 colour or
2921 // less, in this case it would be invoked as CountColours(256)). Default
2922 // value for stopafter is -1 (don't care).
2923 //
2924 unsigned long wxImage::CountColours( unsigned long stopafter ) const
2925 {
2926     wxHashTable h;
2927     wxObject dummy;
2928     unsigned char r, g, b;
2929     unsigned char *p;
2930     unsigned long size, nentries, key;
2931
2932     p = GetData();
2933     size = GetWidth() * GetHeight();
2934     nentries = 0;
2935
2936     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
2937     {
2938         r = *(p++);
2939         g = *(p++);
2940         b = *(p++);
2941         key = wxImageHistogram::MakeKey(r, g, b);
2942
2943         if (h.Get(key) == NULL)
2944         {
2945             h.Put(key, &dummy);
2946             nentries++;
2947         }
2948     }
2949
2950     return nentries;
2951 }
2952
2953
2954 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
2955 {
2956     unsigned char *p = GetData();
2957     unsigned long nentries = 0;
2958
2959     h.clear();
2960
2961     const unsigned long size = GetWidth() * GetHeight();
2962
2963     unsigned char r, g, b;
2964     for ( unsigned long n = 0; n < size; n++ )
2965     {
2966         r = *p++;
2967         g = *p++;
2968         b = *p++;
2969
2970         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
2971
2972         if ( entry.value++ == 0 )
2973             entry.index = nentries++;
2974     }
2975
2976     return nentries;
2977 }
2978
2979 /*
2980  * Rotation code by Carlos Moreno
2981  */
2982
2983 static const double wxROTATE_EPSILON = 1e-10;
2984
2985 // Auxiliary function to rotate a point (x,y) with respect to point p0
2986 // make it inline and use a straight return to facilitate optimization
2987 // also, the function receives the sine and cosine of the angle to avoid
2988 // repeating the time-consuming calls to these functions -- sin/cos can
2989 // be computed and stored in the calling function.
2990
2991 static inline wxRealPoint
2992 wxRotatePoint(const wxRealPoint& p, double cos_angle, double sin_angle,
2993               const wxRealPoint& p0)
2994 {
2995     return wxRealPoint(p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
2996                        p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
2997 }
2998
2999 static inline wxRealPoint
3000 wxRotatePoint(double x, double y, double cos_angle, double sin_angle,
3001               const wxRealPoint & p0)
3002 {
3003     return wxRotatePoint (wxRealPoint(x,y), cos_angle, sin_angle, p0);
3004 }
3005
3006 wxImage wxImage::Rotate(double angle,
3007                         const wxPoint& centre_of_rotation,
3008                         bool interpolating,
3009                         wxPoint *offset_after_rotation) const
3010 {
3011     // screen coordinates are a mirror image of "real" coordinates
3012     angle = -angle;
3013
3014     const bool has_alpha = HasAlpha();
3015
3016     const int w = GetWidth();
3017     const int h = GetHeight();
3018
3019     int i;
3020
3021     // Create pointer-based array to accelerate access to wxImage's data
3022     unsigned char ** data = new unsigned char * [h];
3023     data[0] = GetData();
3024     for (i = 1; i < h; i++)
3025         data[i] = data[i - 1] + (3 * w);
3026
3027     // Same for alpha channel
3028     unsigned char ** alpha = NULL;
3029     if (has_alpha)
3030     {
3031         alpha = new unsigned char * [h];
3032         alpha[0] = GetAlpha();
3033         for (i = 1; i < h; i++)
3034             alpha[i] = alpha[i - 1] + w;
3035     }
3036
3037     // precompute coefficients for rotation formula
3038     const double cos_angle = cos(angle);
3039     const double sin_angle = sin(angle);
3040
3041     // Create new Image to store the result
3042     // First, find rectangle that covers the rotated image;  to do that,
3043     // rotate the four corners
3044
3045     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
3046
3047     wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
3048     wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
3049     wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
3050     wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
3051
3052     int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
3053     int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
3054     int x2a = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
3055     int y2a = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
3056
3057     // Create rotated image
3058     wxImage rotated (x2a - x1a + 1, y2a - y1a + 1, false);
3059     // With alpha channel
3060     if (has_alpha)
3061         rotated.SetAlpha();
3062
3063     if (offset_after_rotation != NULL)
3064     {
3065         *offset_after_rotation = wxPoint (x1a, y1a);
3066     }
3067
3068     // the rotated (destination) image is always accessed sequentially via this
3069     // pointer, there is no need for pointer-based arrays here
3070     unsigned char *dst = rotated.GetData();
3071
3072     unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
3073
3074     // if the original image has a mask, use its RGB values as the blank pixel,
3075     // else, fall back to default (black).
3076     unsigned char blank_r = 0;
3077     unsigned char blank_g = 0;
3078     unsigned char blank_b = 0;
3079
3080     if (HasMask())
3081     {
3082         blank_r = GetMaskRed();
3083         blank_g = GetMaskGreen();
3084         blank_b = GetMaskBlue();
3085         rotated.SetMaskColour( blank_r, blank_g, blank_b );
3086     }
3087
3088     // Now, for each point of the rotated image, find where it came from, by
3089     // performing an inverse rotation (a rotation of -angle) and getting the
3090     // pixel at those coordinates
3091
3092     const int rH = rotated.GetHeight();
3093     const int rW = rotated.GetWidth();
3094
3095     // do the (interpolating) test outside of the loops, so that it is done
3096     // only once, instead of repeating it for each pixel.
3097     if (interpolating)
3098     {
3099         for (int y = 0; y < rH; y++)
3100         {
3101             for (int x = 0; x < rW; x++)
3102             {
3103                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3104
3105                 if (-0.25 < src.x && src.x < w - 0.75 &&
3106                     -0.25 < src.y && src.y < h - 0.75)
3107                 {
3108                     // interpolate using the 4 enclosing grid-points.  Those
3109                     // points can be obtained using floor and ceiling of the
3110                     // exact coordinates of the point
3111                     int x1, y1, x2, y2;
3112
3113                     if (0 < src.x && src.x < w - 1)
3114                     {
3115                         x1 = wxRound(floor(src.x));
3116                         x2 = wxRound(ceil(src.x));
3117                     }
3118                     else    // else means that x is near one of the borders (0 or width-1)
3119                     {
3120                         x1 = x2 = wxRound (src.x);
3121                     }
3122
3123                     if (0 < src.y && src.y < h - 1)
3124                     {
3125                         y1 = wxRound(floor(src.y));
3126                         y2 = wxRound(ceil(src.y));
3127                     }
3128                     else
3129                     {
3130                         y1 = y2 = wxRound (src.y);
3131                     }
3132
3133                     // get four points and the distances (square of the distance,
3134                     // for efficiency reasons) for the interpolation formula
3135
3136                     // GRG: Do not calculate the points until they are
3137                     //      really needed -- this way we can calculate
3138                     //      just one, instead of four, if d1, d2, d3
3139                     //      or d4 are < wxROTATE_EPSILON
3140
3141                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
3142                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
3143                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
3144                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
3145
3146                     // Now interpolate as a weighted average of the four surrounding
3147                     // points, where the weights are the distances to each of those points
3148
3149                     // If the point is exactly at one point of the grid of the source
3150                     // image, then don't interpolate -- just assign the pixel
3151
3152                     // d1,d2,d3,d4 are positive -- no need for abs()
3153                     if (d1 < wxROTATE_EPSILON)
3154                     {
3155                         unsigned char *p = data[y1] + (3 * x1);
3156                         *(dst++) = *(p++);
3157                         *(dst++) = *(p++);
3158                         *(dst++) = *p;
3159
3160                         if (has_alpha)
3161                             *(alpha_dst++) = *(alpha[y1] + x1);
3162                     }
3163                     else if (d2 < wxROTATE_EPSILON)
3164                     {
3165                         unsigned char *p = data[y1] + (3 * x2);
3166                         *(dst++) = *(p++);
3167                         *(dst++) = *(p++);
3168                         *(dst++) = *p;
3169
3170                         if (has_alpha)
3171                             *(alpha_dst++) = *(alpha[y1] + x2);
3172                     }
3173                     else if (d3 < wxROTATE_EPSILON)
3174                     {
3175                         unsigned char *p = data[y2] + (3 * x2);
3176                         *(dst++) = *(p++);
3177                         *(dst++) = *(p++);
3178                         *(dst++) = *p;
3179
3180                         if (has_alpha)
3181                             *(alpha_dst++) = *(alpha[y2] + x2);
3182                     }
3183                     else if (d4 < wxROTATE_EPSILON)
3184                     {
3185                         unsigned char *p = data[y2] + (3 * x1);
3186                         *(dst++) = *(p++);
3187                         *(dst++) = *(p++);
3188                         *(dst++) = *p;
3189
3190                         if (has_alpha)
3191                             *(alpha_dst++) = *(alpha[y2] + x1);
3192                     }
3193                     else
3194                     {
3195                         // weights for the weighted average are proportional to the inverse of the distance
3196                         unsigned char *v1 = data[y1] + (3 * x1);
3197                         unsigned char *v2 = data[y1] + (3 * x2);
3198                         unsigned char *v3 = data[y2] + (3 * x2);
3199                         unsigned char *v4 = data[y2] + (3 * x1);
3200
3201                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
3202
3203                         // GRG: Unrolled.
3204
3205                         *(dst++) = (unsigned char)
3206                             ( (w1 * *(v1++) + w2 * *(v2++) +
3207                                w3 * *(v3++) + w4 * *(v4++)) /
3208                               (w1 + w2 + w3 + w4) );
3209                         *(dst++) = (unsigned char)
3210                             ( (w1 * *(v1++) + w2 * *(v2++) +
3211                                w3 * *(v3++) + w4 * *(v4++)) /
3212                               (w1 + w2 + w3 + w4) );
3213                         *(dst++) = (unsigned char)
3214                             ( (w1 * *v1 + w2 * *v2 +
3215                                w3 * *v3 + w4 * *v4) /
3216                               (w1 + w2 + w3 + w4) );
3217
3218                         if (has_alpha)
3219                         {
3220                             v1 = alpha[y1] + (x1);
3221                             v2 = alpha[y1] + (x2);
3222                             v3 = alpha[y2] + (x2);
3223                             v4 = alpha[y2] + (x1);
3224
3225                             *(alpha_dst++) = (unsigned char)
3226                                 ( (w1 * *v1 + w2 * *v2 +
3227                                    w3 * *v3 + w4 * *v4) /
3228                                   (w1 + w2 + w3 + w4) );
3229                         }
3230                     }
3231                 }
3232                 else
3233                 {
3234                     *(dst++) = blank_r;
3235                     *(dst++) = blank_g;
3236                     *(dst++) = blank_b;
3237
3238                     if (has_alpha)
3239                         *(alpha_dst++) = 0;
3240                 }
3241             }
3242         }
3243     }
3244     else // not interpolating
3245     {
3246         for (int y = 0; y < rH; y++)
3247         {
3248             for (int x = 0; x < rW; x++)
3249             {
3250                 wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
3251
3252                 const int xs = wxRound (src.x);      // wxRound rounds to the
3253                 const int ys = wxRound (src.y);      // closest integer
3254
3255                 if (0 <= xs && xs < w && 0 <= ys && ys < h)
3256                 {
3257                     unsigned char *p = data[ys] + (3 * xs);
3258                     *(dst++) = *(p++);
3259                     *(dst++) = *(p++);
3260                     *(dst++) = *p;
3261
3262                     if (has_alpha)
3263                         *(alpha_dst++) = *(alpha[ys] + (xs));
3264                 }
3265                 else
3266                 {
3267                     *(dst++) = blank_r;
3268                     *(dst++) = blank_g;
3269                     *(dst++) = blank_b;
3270
3271                     if (has_alpha)
3272                         *(alpha_dst++) = 255;
3273                 }
3274             }
3275         }
3276     }
3277
3278     delete [] data;
3279     delete [] alpha;
3280
3281     return rotated;
3282 }
3283
3284
3285
3286
3287
3288 // A module to allow wxImage initialization/cleanup
3289 // without calling these functions from app.cpp or from
3290 // the user's application.
3291
3292 class wxImageModule: public wxModule
3293 {
3294 DECLARE_DYNAMIC_CLASS(wxImageModule)
3295 public:
3296     wxImageModule() {}
3297     bool OnInit() { wxImage::InitStandardHandlers(); return true; }
3298     void OnExit() { wxImage::CleanUpHandlers(); }
3299 };
3300
3301 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
3302
3303
3304 #endif // wxUSE_IMAGE