src/common/image.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  11 #pragma implementation "image.h"
  12 #endif
  13
  14 // For compilers that support precompilation, includes "wx.h".
  15 #include "wx/wxprec.h"
  16
  17 #ifdef __BORLANDC__
  18     #pragma hdrstop
  19 #endif
  20
  21 #include "wx/defs.h"
  22
  23 #if wxUSE_IMAGE
  24
  25 #include "wx/image.h"
  26 #include "wx/bitmap.h"
  27 #include "wx/debug.h"
  28 #include "wx/log.h"
  29 #include "wx/app.h"
  30 #include "wx/filefn.h"
  31 #include "wx/wfstream.h"
  32 #include "wx/intl.h"
  33 #include "wx/module.h"
  34 #include "wx/hash.h"
  35 #include "wx/utils.h"
  36 #include "wx/math.h"
  37
  38 // For memcpy
  39 #include <string.h>
  40
  41 #ifdef __SALFORDC__
  42     #undef FAR
  43 #endif
  44
  45
  46 //-----------------------------------------------------------------------------
  47 // wxImage
  48 //-----------------------------------------------------------------------------
  49
  50 class wxImageRefData: public wxObjectRefData
  51 {
  52 public:
  53     wxImageRefData();
  54     virtual ~wxImageRefData();
  55
  56     int             m_width;
  57     int             m_height;
  58     unsigned char  *m_data;
  59
  60     bool            m_hasMask;
  61     unsigned char   m_maskRed,m_maskGreen,m_maskBlue;
  62
  63     // alpha channel data, may be NULL for the formats without alpha support
  64     unsigned char  *m_alpha;
  65
  66     bool            m_ok;
  67     bool            m_static;
  68
  69 #if wxUSE_PALETTE
  70     wxPalette       m_palette;
  71 #endif // wxUSE_PALETTE
  72
  73     wxArrayString   m_optionNames;
  74     wxArrayString   m_optionValues;
  75
  76     DECLARE_NO_COPY_CLASS(wxImageRefData)
  77 };
  78
  79 wxImageRefData::wxImageRefData()
  80 {
  81     m_width = 0;
  82     m_height = 0;
  83     m_data =
  84     m_alpha = (unsigned char *) NULL;
  85
  86     m_maskRed = 0;
  87     m_maskGreen = 0;
  88     m_maskBlue = 0;
  89     m_hasMask = false;
  90
  91     m_ok = false;
  92     m_static = false;
  93 }
  94
  95 wxImageRefData::~wxImageRefData()
  96 {
  97     if (!m_static)
  98     {
  99         free( m_data );
 100         free( m_alpha );
 101     }
 102 }
 103
 104 wxList wxImage::sm_handlers;
 105
 106 wxImage wxNullImage;
 107
 108 //-----------------------------------------------------------------------------
 109
 110 #define M_IMGDATA ((wxImageRefData *)m_refData)
 111
 112 IMPLEMENT_DYNAMIC_CLASS(wxImage, wxObject)
 113
 114 wxImage::wxImage( int width, int height, bool clear )
 115 {
 116     Create( width, height, clear );
 117 }
 118
 119 wxImage::wxImage( int width, int height, unsigned char* data, bool static_data )
 120 {
 121     Create( width, height, data, static_data );
 122 }
 123
 124 wxImage::wxImage( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 125 {
 126     Create( width, height, data, alpha, static_data );
 127 }
 128
 129 wxImage::wxImage( const wxString& name, long type, int index )
 130 {
 131     LoadFile( name, type, index );
 132 }
 133
 134 wxImage::wxImage( const wxString& name, const wxString& mimetype, int index )
 135 {
 136     LoadFile( name, mimetype, index );
 137 }
 138
 139 #if wxUSE_STREAMS
 140 wxImage::wxImage( wxInputStream& stream, long type, int index )
 141 {
 142     LoadFile( stream, type, index );
 143 }
 144
 145 wxImage::wxImage( wxInputStream& stream, const wxString& mimetype, int index )
 146 {
 147     LoadFile( stream, mimetype, index );
 148 }
 149 #endif // wxUSE_STREAMS
 150
 151 wxImage::wxImage( const wxImage& image )
 152     : wxObject()
 153 {
 154     Ref(image);
 155 }
 156
 157 wxImage::wxImage( const wxImage* image )
 158 {
 159     if (image) Ref(*image);
 160 }
 161
 162 bool wxImage::Create( int width, int height, bool clear )
 163 {
 164     UnRef();
 165
 166     m_refData = new wxImageRefData();
 167
 168     M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
 169     if (!M_IMGDATA->m_data)
 170     {
 171         UnRef();
 172         return false;
 173     }
 174
 175     if (clear)
 176         memset(M_IMGDATA->m_data, 0, width*height*3);
 177
 178     M_IMGDATA->m_width = width;
 179     M_IMGDATA->m_height = height;
 180     M_IMGDATA->m_ok = true;
 181
 182     return true;
 183 }
 184
 185 bool wxImage::Create( int width, int height, unsigned char* data, bool static_data )
 186 {
 187     UnRef();
 188
 189     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 190
 191     m_refData = new wxImageRefData();
 192
 193     M_IMGDATA->m_data = data;
 194     M_IMGDATA->m_width = width;
 195     M_IMGDATA->m_height = height;
 196     M_IMGDATA->m_ok = true;
 197     M_IMGDATA->m_static = static_data;
 198
 199     return true;
 200 }
 201
 202 bool wxImage::Create( int width, int height, unsigned char* data, unsigned char* alpha, bool static_data )
 203 {
 204     UnRef();
 205
 206     wxCHECK_MSG( data, false, _T("NULL data in wxImage::Create") );
 207
 208     m_refData = new wxImageRefData();
 209
 210     M_IMGDATA->m_data = data;
 211     M_IMGDATA->m_alpha = alpha;
 212     M_IMGDATA->m_width = width;
 213     M_IMGDATA->m_height = height;
 214     M_IMGDATA->m_ok = true;
 215     M_IMGDATA->m_static = static_data;
 216
 217     return true;
 218 }
 219
 220 void wxImage::Destroy()
 221 {
 222     UnRef();
 223 }
 224
 225 wxImage wxImage::Copy() const
 226 {
 227     wxImage image;
 228
 229     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 230
 231     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 232
 233     unsigned char *data = image.GetData();
 234
 235     wxCHECK_MSG( data, image, wxT("unable to create image") );
 236
 237     image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 238     image.SetMask( M_IMGDATA->m_hasMask );
 239
 240     memcpy( data, GetData(), M_IMGDATA->m_width*M_IMGDATA->m_height*3 );
 241
 242     // also copy the image options
 243     wxImageRefData *imgData = (wxImageRefData *)image.m_refData;
 244     imgData->m_optionNames = M_IMGDATA->m_optionNames;
 245     imgData->m_optionValues = M_IMGDATA->m_optionValues;
 246
 247     return image;
 248 }
 249
 250 wxImage wxImage::ShrinkBy( int xFactor , int yFactor ) const
 251 {
 252     if( xFactor == 1 && yFactor == 1 )
 253         return Copy() ;
 254
 255     wxImage image;
 256
 257     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 258
 259     // can't scale to/from 0 size
 260     wxCHECK_MSG( (xFactor > 0) && (yFactor > 0), image,
 261                  wxT("invalid new image size") );
 262
 263     long old_height = M_IMGDATA->m_height,
 264          old_width  = M_IMGDATA->m_width;
 265
 266     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 267                  wxT("invalid old image size") );
 268
 269     long width = old_width / xFactor ;
 270     long height = old_height / yFactor ;
 271
 272     image.Create( width, height, false );
 273
 274     char unsigned *data = image.GetData();
 275
 276     wxCHECK_MSG( data, image, wxT("unable to create image") );
 277
 278     bool hasMask = false ;
 279     unsigned char maskRed = 0;
 280     unsigned char maskGreen = 0;
 281     unsigned char maskBlue =0 ;
 282
 283     unsigned char *source_data = M_IMGDATA->m_data;
 284     unsigned char *target_data = data;
 285     unsigned char *source_alpha = 0 ;
 286     unsigned char *target_alpha = 0 ;
 287     if (M_IMGDATA->m_hasMask)
 288     {
 289         hasMask = true ;
 290         maskRed = M_IMGDATA->m_maskRed;
 291         maskGreen = M_IMGDATA->m_maskGreen;
 292         maskBlue =M_IMGDATA->m_maskBlue ;
 293
 294         image.SetMaskColour( M_IMGDATA->m_maskRed,
 295                              M_IMGDATA->m_maskGreen,
 296                              M_IMGDATA->m_maskBlue );
 297     }
 298     else
 299     {
 300         source_alpha = M_IMGDATA->m_alpha ;
 301         if ( source_alpha )
 302         {
 303             image.SetAlpha() ;
 304             target_alpha = image.GetAlpha() ;
 305         }
 306     }
 307
 308     for (long y = 0; y < height; y++)
 309     {
 310         for (long x = 0; x < width; x++)
 311         {
 312             unsigned long avgRed = 0 ;
 313             unsigned long avgGreen = 0;
 314             unsigned long avgBlue = 0;
 315             unsigned long avgAlpha = 0 ;
 316             unsigned long counter = 0 ;
 317             // determine average
 318             for ( int y1 = 0 ; y1 < yFactor ; ++y1 )
 319             {
 320                 long y_offset = (y * yFactor + y1) * old_width;
 321                 for ( int x1 = 0 ; x1 < xFactor ; ++x1 )
 322                 {
 323                     unsigned char *pixel = source_data + 3 * ( y_offset + x * xFactor + x1 ) ;
 324                     unsigned char red = pixel[0] ;
 325                     unsigned char green = pixel[1] ;
 326                     unsigned char blue = pixel[2] ;
 327                     unsigned char alpha = 255  ;
 328                     if ( source_alpha )
 329                         alpha = *(source_alpha + y_offset + x * xFactor + x1) ;
 330                     if ( !hasMask || red != maskRed || green != maskGreen || blue != maskBlue )
 331                     {
 332                         if ( alpha > 0 )
 333                         {
 334                             avgRed += red ;
 335                             avgGreen += green ;
 336                             avgBlue += blue ;
 337                         }
 338                         avgAlpha += alpha ;
 339                         counter++ ;
 340                     }
 341                 }
 342             }
 343             if ( counter == 0 )
 344             {
 345                 *(target_data++) = M_IMGDATA->m_maskRed ;
 346                 *(target_data++) = M_IMGDATA->m_maskGreen ;
 347                 *(target_data++) = M_IMGDATA->m_maskBlue ;
 348             }
 349             else
 350             {
 351                 if ( source_alpha )
 352                     *(target_alpha++) = (unsigned char)(avgAlpha / counter ) ;
 353                 *(target_data++) = (unsigned char)(avgRed / counter);
 354                 *(target_data++) = (unsigned char)(avgGreen / counter);
 355                 *(target_data++) = (unsigned char)(avgBlue / counter);
 356             }
 357         }
 358     }
 359
 360     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 361     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 362         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 363                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X))/xFactor);
 364     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 365         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 366                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y))/yFactor);
 367
 368     return image;
 369 }
 370
 371 wxImage wxImage::Scale( int width, int height ) const
 372 {
 373     wxImage image;
 374
 375     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 376
 377     // can't scale to/from 0 size
 378     wxCHECK_MSG( (width > 0) && (height > 0), image,
 379                  wxT("invalid new image size") );
 380
 381     long old_height = M_IMGDATA->m_height,
 382          old_width  = M_IMGDATA->m_width;
 383     wxCHECK_MSG( (old_height > 0) && (old_width > 0), image,
 384                  wxT("invalid old image size") );
 385
 386     if ( old_width % width == 0 && old_width >= width &&
 387         old_height % height == 0 && old_height >= height )
 388     {
 389         return ShrinkBy( old_width / width , old_height / height ) ;
 390     }
 391     image.Create( width, height, false );
 392
 393     unsigned char *data = image.GetData();
 394
 395     wxCHECK_MSG( data, image, wxT("unable to create image") );
 396
 397     unsigned char *source_data = M_IMGDATA->m_data;
 398     unsigned char *target_data = data;
 399     unsigned char *source_alpha = 0 ;
 400     unsigned char *target_alpha = 0 ;
 401
 402     if (M_IMGDATA->m_hasMask)
 403     {
 404         image.SetMaskColour( M_IMGDATA->m_maskRed,
 405                              M_IMGDATA->m_maskGreen,
 406                              M_IMGDATA->m_maskBlue );
 407     }
 408     else
 409     {
 410         source_alpha = M_IMGDATA->m_alpha ;
 411         if ( source_alpha )
 412         {
 413             image.SetAlpha() ;
 414             target_alpha = image.GetAlpha() ;
 415         }
 416     }
 417
 418     long x_delta = (old_width<<16) / width;
 419     long y_delta = (old_height<<16) / height;
 420
 421     unsigned char* dest_pixel = target_data;
 422
 423     long y = 0;
 424     for ( long j = 0; j < height; j++ )
 425         {
 426         unsigned char* src_line = &source_data[(y>>16)*old_width*3];
 427         unsigned char* src_alpha_line = source_alpha ? &source_alpha[(y>>16)*old_width] : 0 ;
 428
 429         long x = 0;
 430         for ( long i = 0; i < width; i++ )
 431         {
 432              unsigned char* src_pixel = &src_line[(x>>16)*3];
 433              unsigned char* src_alpha_pixel = source_alpha ? &src_alpha_line[(x>>16)] : 0 ;
 434              dest_pixel[0] = src_pixel[0];
 435              dest_pixel[1] = src_pixel[1];
 436              dest_pixel[2] = src_pixel[2];
 437              dest_pixel += 3;
 438              if ( source_alpha )
 439                 *(target_alpha++) = *src_alpha_pixel ;
 440              x += x_delta;
 441         }
 442
 443         y += y_delta;
 444     }
 445
 446     // In case this is a cursor, make sure the hotspot is scalled accordingly:
 447     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_X) )
 448         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_X,
 449                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_X)*width)/old_width);
 450     if ( HasOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y) )
 451         image.SetOption(wxIMAGE_OPTION_CUR_HOTSPOT_Y,
 452                 (GetOptionInt(wxIMAGE_OPTION_CUR_HOTSPOT_Y)*height)/old_height);
 453
 454     return image;
 455 }
 456
 457 wxImage wxImage::Rotate90( bool clockwise ) const
 458 {
 459     wxImage image;
 460
 461     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 462
 463     image.Create( M_IMGDATA->m_height, M_IMGDATA->m_width, false );
 464
 465     unsigned char *data = image.GetData();
 466
 467     wxCHECK_MSG( data, image, wxT("unable to create image") );
 468
 469     if (M_IMGDATA->m_hasMask)
 470         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 471
 472     long height = M_IMGDATA->m_height;
 473     long width  = M_IMGDATA->m_width;
 474
 475     unsigned char *source_data = M_IMGDATA->m_data;
 476     unsigned char *target_data;
 477
 478     for (long j = 0; j < height; j++)
 479     {
 480         for (long i = 0; i < width; i++)
 481         {
 482             if (clockwise)
 483                 target_data = data + (((i+1)*height) - j - 1)*3;
 484             else
 485                 target_data = data + ((height*(width-1)) + j - (i*height))*3;
 486             memcpy( target_data, source_data, 3 );
 487             source_data += 3;
 488         }
 489     }
 490
 491     return image;
 492 }
 493
 494 wxImage wxImage::Mirror( bool horizontally ) const
 495 {
 496     wxImage image;
 497
 498     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 499
 500     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 501
 502     unsigned char *data = image.GetData();
 503
 504     wxCHECK_MSG( data, image, wxT("unable to create image") );
 505
 506     if (M_IMGDATA->m_hasMask)
 507         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 508
 509     long height = M_IMGDATA->m_height;
 510     long width  = M_IMGDATA->m_width;
 511
 512     unsigned char *source_data = M_IMGDATA->m_data;
 513     unsigned char *target_data;
 514
 515     if (horizontally)
 516     {
 517         for (long j = 0; j < height; j++)
 518         {
 519             data += width*3;
 520             target_data = data-3;
 521             for (long i = 0; i < width; i++)
 522             {
 523                 memcpy( target_data, source_data, 3 );
 524                 source_data += 3;
 525                 target_data -= 3;
 526             }
 527         }
 528     }
 529     else
 530     {
 531         for (long i = 0; i < height; i++)
 532         {
 533             target_data = data + 3*width*(height-1-i);
 534             memcpy( target_data, source_data, (size_t)3*width );
 535             source_data += 3*width;
 536         }
 537     }
 538
 539     return image;
 540 }
 541
 542 wxImage wxImage::GetSubImage( const wxRect &rect ) const
 543 {
 544     wxImage image;
 545
 546     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 547
 548     wxCHECK_MSG( (rect.GetLeft()>=0) && (rect.GetTop()>=0) && (rect.GetRight()<=GetWidth()) && (rect.GetBottom()<=GetHeight()),
 549                  image, wxT("invalid subimage size") );
 550
 551     int subwidth=rect.GetWidth();
 552     const int subheight=rect.GetHeight();
 553
 554     image.Create( subwidth, subheight, false );
 555
 556     unsigned char *subdata = image.GetData(), *data=GetData();
 557
 558     wxCHECK_MSG( subdata, image, wxT("unable to create image") );
 559
 560     if (M_IMGDATA->m_hasMask)
 561         image.SetMaskColour( M_IMGDATA->m_maskRed, M_IMGDATA->m_maskGreen, M_IMGDATA->m_maskBlue );
 562
 563     const int subleft=3*rect.GetLeft();
 564     const int width=3*GetWidth();
 565     subwidth*=3;
 566
 567     data+=rect.GetTop()*width+subleft;
 568
 569     for (long j = 0; j < subheight; ++j)
 570     {
 571         memcpy( subdata, data, subwidth);
 572         subdata+=subwidth;
 573         data+=width;
 574     }
 575
 576     return image;
 577 }
 578
 579 void wxImage::Paste( const wxImage &image, int x, int y )
 580 {
 581     wxCHECK_RET( Ok(), wxT("invalid image") );
 582     wxCHECK_RET( image.Ok(), wxT("invalid image") );
 583
 584     int xx = 0;
 585     int yy = 0;
 586     int width = image.GetWidth();
 587     int height = image.GetHeight();
 588
 589     if (x < 0)
 590     {
 591         xx = -x;
 592         width += x;
 593     }
 594     if (y < 0)
 595     {
 596         yy = -y;
 597         height += y;
 598     }
 599
 600     if ((x+xx)+width > M_IMGDATA->m_width)
 601         width = M_IMGDATA->m_width - (x+xx);
 602     if ((y+yy)+height > M_IMGDATA->m_height)
 603         height = M_IMGDATA->m_height - (y+yy);
 604
 605     if (width < 1) return;
 606     if (height < 1) return;
 607
 608     if ((!HasMask() && !image.HasMask()) ||
 609        ((HasMask() && image.HasMask() &&
 610          (GetMaskRed()==image.GetMaskRed()) &&
 611          (GetMaskGreen()==image.GetMaskGreen()) &&
 612          (GetMaskBlue()==image.GetMaskBlue()))))
 613     {
 614         width *= 3;
 615         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 616         int source_step = image.GetWidth()*3;
 617
 618         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 619         int target_step = M_IMGDATA->m_width*3;
 620         for (int j = 0; j < height; j++)
 621         {
 622             memcpy( target_data, source_data, width );
 623             source_data += source_step;
 624             target_data += target_step;
 625         }
 626         return;
 627     }
 628
 629     if (!HasMask() && image.HasMask())
 630     {
 631         unsigned char r = image.GetMaskRed();
 632         unsigned char g = image.GetMaskGreen();
 633         unsigned char b = image.GetMaskBlue();
 634
 635         width *= 3;
 636         unsigned char* source_data = image.GetData() + xx*3 + yy*3*image.GetWidth();
 637         int source_step = image.GetWidth()*3;
 638
 639         unsigned char* target_data = GetData() + (x+xx)*3 + (y+yy)*3*M_IMGDATA->m_width;
 640         int target_step = M_IMGDATA->m_width*3;
 641
 642         for (int j = 0; j < height; j++)
 643         {
 644             for (int i = 0; i < width; i+=3)
 645             {
 646                 if ((source_data[i]   != r) &&
 647                     (source_data[i+1] != g) &&
 648                     (source_data[i+2] != b))
 649                 {
 650                     memcpy( target_data+i, source_data+i, 3 );
 651                 }
 652             }
 653             source_data += source_step;
 654             target_data += target_step;
 655         }
 656     }
 657 }
 658
 659 void wxImage::Replace( unsigned char r1, unsigned char g1, unsigned char b1,
 660                        unsigned char r2, unsigned char g2, unsigned char b2 )
 661 {
 662     wxCHECK_RET( Ok(), wxT("invalid image") );
 663
 664     unsigned char *data = GetData();
 665
 666     const int w = GetWidth();
 667     const int h = GetHeight();
 668
 669     for (int j = 0; j < h; j++)
 670         for (int i = 0; i < w; i++)
 671         {
 672             if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
 673             {
 674                 data[0] = r2;
 675                 data[1] = g2;
 676                 data[2] = b2;
 677             }
 678             data += 3;
 679         }
 680 }
 681
 682 wxImage wxImage::ConvertToMono( unsigned char r, unsigned char g, unsigned char b ) const
 683 {
 684     wxImage image;
 685
 686     wxCHECK_MSG( Ok(), image, wxT("invalid image") );
 687
 688     image.Create( M_IMGDATA->m_width, M_IMGDATA->m_height, false );
 689
 690     unsigned char *data = image.GetData();
 691
 692     wxCHECK_MSG( data, image, wxT("unable to create image") );
 693
 694     if (M_IMGDATA->m_hasMask)
 695     {
 696         if (M_IMGDATA->m_maskRed == r && M_IMGDATA->m_maskGreen == g &&
 697                                          M_IMGDATA->m_maskBlue == b)
 698             image.SetMaskColour( 255, 255, 255 );
 699         else
 700             image.SetMaskColour( 0, 0, 0 );
 701     }
 702
 703     long size = M_IMGDATA->m_height * M_IMGDATA->m_width;
 704
 705     unsigned char *srcd = M_IMGDATA->m_data;
 706     unsigned char *tard = image.GetData();
 707
 708     for ( long i = 0; i < size; i++, srcd += 3, tard += 3 )
 709     {
 710         if (srcd[0] == r && srcd[1] == g && srcd[2] == b)
 711             tard[0] = tard[1] = tard[2] = 255;
 712         else
 713             tard[0] = tard[1] = tard[2] = 0;
 714     }
 715
 716     return image;
 717 }
 718
 719 void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
 720 {
 721     wxCHECK_RET( Ok(), wxT("invalid image") );
 722
 723     int w = M_IMGDATA->m_width;
 724     int h = M_IMGDATA->m_height;
 725
 726     wxCHECK_RET( (x>=0) && (y>=0) && (x<w) && (y<h), wxT("invalid image index") );
 727
 728     long pos = (y * w + x) * 3;
 729
 730     M_IMGDATA->m_data[ pos   ] = r;
 731     M_IMGDATA->m_data[ pos+1 ] = g;
 732     M_IMGDATA->m_data[ pos+2 ] = b;
 733 }
 734
 735 unsigned char wxImage::GetRed( int x, int y ) const
 736 {
 737     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 738
 739     int w = M_IMGDATA->m_width;
 740     int h = M_IMGDATA->m_height;
 741
 742     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 743
 744     long pos = (y * w + x) * 3;
 745
 746     return M_IMGDATA->m_data[pos];
 747 }
 748
 749 unsigned char wxImage::GetGreen( int x, int y ) const
 750 {
 751     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 752
 753     int w = M_IMGDATA->m_width;
 754     int h = M_IMGDATA->m_height;
 755
 756     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 757
 758     long pos = (y * w + x) * 3;
 759
 760     return M_IMGDATA->m_data[pos+1];
 761 }
 762
 763 unsigned char wxImage::GetBlue( int x, int y ) const
 764 {
 765     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 766
 767     int w = M_IMGDATA->m_width;
 768     int h = M_IMGDATA->m_height;
 769
 770     wxCHECK_MSG( (x>=0) && (y>=0) && (x<w) && (y<h), 0, wxT("invalid image index") );
 771
 772     long pos = (y * w + x) * 3;
 773
 774     return M_IMGDATA->m_data[pos+2];
 775 }
 776
 777 bool wxImage::Ok() const
 778 {
 779     // image of 0 width or height can't be considered ok - at least because it
 780     // causes crashes in ConvertToBitmap() if we don't catch it in time
 781     wxImageRefData *data = M_IMGDATA;
 782     return data && data->m_ok && data->m_width && data->m_height;
 783 }
 784
 785 unsigned char *wxImage::GetData() const
 786 {
 787     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 788
 789     return M_IMGDATA->m_data;
 790 }
 791
 792 void wxImage::SetData( unsigned char *data )
 793 {
 794     wxCHECK_RET( Ok(), wxT("invalid image") );
 795
 796     wxImageRefData *newRefData = new wxImageRefData();
 797
 798     newRefData->m_width = M_IMGDATA->m_width;
 799     newRefData->m_height = M_IMGDATA->m_height;
 800     newRefData->m_data = data;
 801     newRefData->m_ok = true;
 802     newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 803     newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 804     newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 805     newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 806
 807     UnRef();
 808
 809     m_refData = newRefData;
 810 }
 811
 812 void wxImage::SetData( unsigned char *data, int new_width, int new_height )
 813 {
 814     wxImageRefData *newRefData = new wxImageRefData();
 815
 816     if (m_refData)
 817     {
 818         newRefData->m_width = new_width;
 819         newRefData->m_height = new_height;
 820         newRefData->m_data = data;
 821         newRefData->m_ok = true;
 822         newRefData->m_maskRed = M_IMGDATA->m_maskRed;
 823         newRefData->m_maskGreen = M_IMGDATA->m_maskGreen;
 824         newRefData->m_maskBlue = M_IMGDATA->m_maskBlue;
 825         newRefData->m_hasMask = M_IMGDATA->m_hasMask;
 826     }
 827     else
 828     {
 829         newRefData->m_width = new_width;
 830         newRefData->m_height = new_height;
 831         newRefData->m_data = data;
 832         newRefData->m_ok = true;
 833     }
 834
 835     UnRef();
 836
 837     m_refData = newRefData;
 838 }
 839
 840 // ----------------------------------------------------------------------------
 841 // alpha channel support
 842 // ----------------------------------------------------------------------------
 843
 844 void wxImage::SetAlpha(int x, int y, unsigned char alpha)
 845 {
 846     wxCHECK_RET( Ok() && HasAlpha(), wxT("invalid image or no alpha channel") );
 847
 848     int w = M_IMGDATA->m_width,
 849         h = M_IMGDATA->m_height;
 850
 851     wxCHECK_RET( x >=0 && y >= 0 && x < w && y < h, wxT("invalid image index") );
 852
 853     M_IMGDATA->m_alpha[y*w + x] = alpha;
 854 }
 855
 856 unsigned char wxImage::GetAlpha(int x, int y) const
 857 {
 858     wxCHECK_MSG( Ok() && HasAlpha(), 0, wxT("invalid image or no alpha channel") );
 859
 860     int w = M_IMGDATA->m_width,
 861         h = M_IMGDATA->m_height;
 862
 863     wxCHECK_MSG( x >=0 && y >= 0 && x < w && y < h, 0, wxT("invalid image index") );
 864
 865     return M_IMGDATA->m_alpha[y*w + x];
 866 }
 867
 868 bool wxImage::ConvertColourToAlpha( unsigned char r, unsigned char g, unsigned char b )
 869 {
 870     SetAlpha( NULL );
 871
 872     int w = M_IMGDATA->m_width,
 873         h = M_IMGDATA->m_height;
 874
 875     unsigned char *alpha = GetAlpha();
 876     unsigned char *data = GetData();
 877
 878     int x,y;
 879     for (y = 0; y < h; y++)
 880         for (x = 0; x < w; x++)
 881             {
 882                 *alpha = *data;
 883                 alpha++;
 884                 *data = r;
 885                 data++;
 886                 *data = g;
 887                 data++;
 888                 *data = b;
 889                 data++;
 890             }
 891
 892     return true;
 893 }
 894
 895 void wxImage::SetAlpha( unsigned char *alpha )
 896 {
 897     wxCHECK_RET( Ok(), wxT("invalid image") );
 898
 899     if ( !alpha )
 900     {
 901         alpha = (unsigned char *)malloc(M_IMGDATA->m_width*M_IMGDATA->m_height);
 902     }
 903
 904     free(M_IMGDATA->m_alpha);
 905     M_IMGDATA->m_alpha = alpha;
 906 }
 907
 908 unsigned char *wxImage::GetAlpha() const
 909 {
 910     wxCHECK_MSG( Ok(), (unsigned char *)NULL, wxT("invalid image") );
 911
 912     return M_IMGDATA->m_alpha;
 913 }
 914
 915 // ----------------------------------------------------------------------------
 916 // mask support
 917 // ----------------------------------------------------------------------------
 918
 919 void wxImage::SetMaskColour( unsigned char r, unsigned char g, unsigned char b )
 920 {
 921     wxCHECK_RET( Ok(), wxT("invalid image") );
 922
 923     M_IMGDATA->m_maskRed = r;
 924     M_IMGDATA->m_maskGreen = g;
 925     M_IMGDATA->m_maskBlue = b;
 926     M_IMGDATA->m_hasMask = true;
 927 }
 928
 929 unsigned char wxImage::GetMaskRed() const
 930 {
 931     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 932
 933     return M_IMGDATA->m_maskRed;
 934 }
 935
 936 unsigned char wxImage::GetMaskGreen() const
 937 {
 938     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 939
 940     return M_IMGDATA->m_maskGreen;
 941 }
 942
 943 unsigned char wxImage::GetMaskBlue() const
 944 {
 945     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 946
 947     return M_IMGDATA->m_maskBlue;
 948 }
 949
 950 void wxImage::SetMask( bool mask )
 951 {
 952     wxCHECK_RET( Ok(), wxT("invalid image") );
 953
 954     M_IMGDATA->m_hasMask = mask;
 955 }
 956
 957 bool wxImage::HasMask() const
 958 {
 959     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
 960
 961     return M_IMGDATA->m_hasMask;
 962 }
 963
 964 int wxImage::GetWidth() const
 965 {
 966     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 967
 968     return M_IMGDATA->m_width;
 969 }
 970
 971 int wxImage::GetHeight() const
 972 {
 973     wxCHECK_MSG( Ok(), 0, wxT("invalid image") );
 974
 975     return M_IMGDATA->m_height;
 976 }
 977
 978 bool wxImage::SetMaskFromImage(const wxImage& mask,
 979                                unsigned char mr, unsigned char mg, unsigned char mb)
 980 {
 981     // check that the images are the same size
 982     if ( (M_IMGDATA->m_height != mask.GetHeight() ) || (M_IMGDATA->m_width != mask.GetWidth () ) )
 983     {
 984         wxLogError( _("Image and mask have different sizes.") );
 985         return false;
 986     }
 987
 988     // find unused colour
 989     unsigned char r,g,b ;
 990     if (!FindFirstUnusedColour(&r, &g, &b))
 991     {
 992         wxLogError( _("No unused colour in image being masked.") );
 993         return false ;
 994     }
 995
 996     unsigned char *imgdata = GetData();
 997     unsigned char *maskdata = mask.GetData();
 998
 999     const int w = GetWidth();
1000     const int h = GetHeight();
1001
1002     for (int j = 0; j < h; j++)
1003     {
1004         for (int i = 0; i < w; i++)
1005         {
1006             if ((maskdata[0] == mr) && (maskdata[1]  == mg) && (maskdata[2] == mb))
1007             {
1008                 imgdata[0] = r;
1009                 imgdata[1] = g;
1010                 imgdata[2] = b;
1011             }
1012             imgdata  += 3;
1013             maskdata += 3;
1014         }
1015     }
1016
1017     SetMaskColour(r, g, b);
1018     SetMask(true);
1019
1020     return true;
1021 }
1022
1023 bool wxImage::ConvertAlphaToMask(unsigned char threshold)
1024 {
1025     if (!HasAlpha())
1026         return true;
1027
1028     unsigned char mr, mg, mb;
1029     if (!FindFirstUnusedColour(&mr, &mg, &mb))
1030     {
1031         wxLogError( _("No unused colour in image being masked.") );
1032         return false;
1033     }
1034
1035     SetMask(true);
1036     SetMaskColour(mr, mg, mb);
1037
1038     unsigned char *imgdata = GetData();
1039     unsigned char *alphadata = GetAlpha();
1040
1041     int w = GetWidth();
1042     int h = GetHeight();
1043
1044     for (int y = 0; y < h; y++)
1045     {
1046         for (int x = 0; x < w; x++, imgdata += 3, alphadata++)
1047         {
1048             if (*alphadata < threshold)
1049             {
1050                 imgdata[0] = mr;
1051                 imgdata[1] = mg;
1052                 imgdata[2] = mb;
1053             }
1054         }
1055     }
1056
1057     free(M_IMGDATA->m_alpha);
1058     M_IMGDATA->m_alpha = NULL;
1059
1060     return true;
1061 }
1062
1063 #if wxUSE_PALETTE
1064
1065 // Palette functions
1066
1067 bool wxImage::HasPalette() const
1068 {
1069     if (!Ok())
1070         return false;
1071
1072     return M_IMGDATA->m_palette.Ok();
1073 }
1074
1075 const wxPalette& wxImage::GetPalette() const
1076 {
1077     wxCHECK_MSG( Ok(), wxNullPalette, wxT("invalid image") );
1078
1079     return M_IMGDATA->m_palette;
1080 }
1081
1082 void wxImage::SetPalette(const wxPalette& palette)
1083 {
1084     wxCHECK_RET( Ok(), wxT("invalid image") );
1085
1086     M_IMGDATA->m_palette = palette;
1087 }
1088
1089 #endif // wxUSE_PALETTE
1090
1091 // Option functions (arbitrary name/value mapping)
1092 void wxImage::SetOption(const wxString& name, const wxString& value)
1093 {
1094     wxCHECK_RET( Ok(), wxT("invalid image") );
1095
1096     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1097     if (idx == wxNOT_FOUND)
1098     {
1099         M_IMGDATA->m_optionNames.Add(name);
1100         M_IMGDATA->m_optionValues.Add(value);
1101     }
1102     else
1103     {
1104         M_IMGDATA->m_optionNames[idx] = name;
1105         M_IMGDATA->m_optionValues[idx] = value;
1106     }
1107 }
1108
1109 void wxImage::SetOption(const wxString& name, int value)
1110 {
1111     wxString valStr;
1112     valStr.Printf(wxT("%d"), value);
1113     SetOption(name, valStr);
1114 }
1115
1116 wxString wxImage::GetOption(const wxString& name) const
1117 {
1118     wxCHECK_MSG( Ok(), wxEmptyString, wxT("invalid image") );
1119
1120     int idx = M_IMGDATA->m_optionNames.Index(name, false);
1121     if (idx == wxNOT_FOUND)
1122         return wxEmptyString;
1123     else
1124         return M_IMGDATA->m_optionValues[idx];
1125 }
1126
1127 int wxImage::GetOptionInt(const wxString& name) const
1128 {
1129     return wxAtoi(GetOption(name));
1130 }
1131
1132 bool wxImage::HasOption(const wxString& name) const
1133 {
1134     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1135
1136     return (M_IMGDATA->m_optionNames.Index(name, false) != wxNOT_FOUND);
1137 }
1138
1139 bool wxImage::LoadFile( const wxString& filename, long type, int index )
1140 {
1141 #if wxUSE_STREAMS
1142     if (wxFileExists(filename))
1143     {
1144         wxFileInputStream stream(filename);
1145         wxBufferedInputStream bstream( stream );
1146         return LoadFile(bstream, type, index);
1147     }
1148     else
1149     {
1150         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1151
1152         return false;
1153     }
1154 #else // !wxUSE_STREAMS
1155     return false;
1156 #endif // wxUSE_STREAMS
1157 }
1158
1159 bool wxImage::LoadFile( const wxString& filename, const wxString& mimetype, int index )
1160 {
1161 #if wxUSE_STREAMS
1162     if (wxFileExists(filename))
1163     {
1164         wxFileInputStream stream(filename);
1165         wxBufferedInputStream bstream( stream );
1166         return LoadFile(bstream, mimetype, index);
1167     }
1168     else
1169     {
1170         wxLogError( _("Can't load image from file '%s': file does not exist."), filename.c_str() );
1171
1172         return false;
1173     }
1174 #else // !wxUSE_STREAMS
1175     return false;
1176 #endif // wxUSE_STREAMS
1177 }
1178
1179
1180
1181 bool wxImage::SaveFile( const wxString& filename ) const
1182 {
1183     wxString ext = filename.AfterLast('.').Lower();
1184
1185     wxImageHandler * pHandler = FindHandler(ext, -1);
1186     if (pHandler)
1187     {
1188         SaveFile(filename, pHandler->GetType());
1189         return true;
1190     }
1191
1192     wxLogError(_("Can't save image to file '%s': unknown extension."), filename.c_str());
1193
1194     return false;
1195 }
1196
1197 bool wxImage::SaveFile( const wxString& filename, int type ) const
1198 {
1199 #if wxUSE_STREAMS
1200     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1201
1202     wxFileOutputStream stream(filename);
1203
1204     if ( stream.IsOk() )
1205     {
1206         wxBufferedOutputStream bstream( stream );
1207         return SaveFile(bstream, type);
1208     }
1209 #endif // wxUSE_STREAMS
1210
1211     return false;
1212 }
1213
1214 bool wxImage::SaveFile( const wxString& filename, const wxString& mimetype ) const
1215 {
1216 #if wxUSE_STREAMS
1217     ((wxImage*)this)->SetOption(wxIMAGE_OPTION_FILENAME, filename);
1218
1219     wxFileOutputStream stream(filename);
1220
1221     if ( stream.IsOk() )
1222     {
1223         wxBufferedOutputStream bstream( stream );
1224         return SaveFile(bstream, mimetype);
1225     }
1226 #endif // wxUSE_STREAMS
1227
1228     return false;
1229 }
1230
1231 bool wxImage::CanRead( const wxString &name )
1232 {
1233 #if wxUSE_STREAMS
1234   wxFileInputStream stream(name);
1235   return CanRead(stream);
1236 #else
1237   return false;
1238 #endif
1239 }
1240
1241 int wxImage::GetImageCount( const wxString &name, long type )
1242 {
1243 #if wxUSE_STREAMS
1244   wxFileInputStream stream(name);
1245   if (stream.Ok())
1246       return GetImageCount(stream, type);
1247 #endif
1248
1249   return 0;
1250 }
1251
1252 #if wxUSE_STREAMS
1253
1254 bool wxImage::CanRead( wxInputStream &stream )
1255 {
1256     const wxList& list = GetHandlers();
1257
1258     for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1259     {
1260         wxImageHandler *handler=(wxImageHandler*)node->GetData();
1261         if (handler->CanRead( stream ))
1262             return true;
1263     }
1264
1265     return false;
1266 }
1267
1268 int wxImage::GetImageCount( wxInputStream &stream, long type )
1269 {
1270     wxImageHandler *handler;
1271
1272     if ( type == wxBITMAP_TYPE_ANY )
1273     {
1274         wxList &list=GetHandlers();
1275
1276         for (wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext())
1277         {
1278              handler=(wxImageHandler*)node->GetData();
1279              if ( handler->CanRead(stream) )
1280                  return handler->GetImageCount(stream);
1281
1282         }
1283
1284         wxLogWarning(_("No handler found for image type."));
1285         return 0;
1286     }
1287
1288     handler = FindHandler(type);
1289
1290     if ( !handler )
1291     {
1292         wxLogWarning(_("No image handler for type %d defined."), type);
1293         return false;
1294     }
1295
1296     if ( handler->CanRead(stream) )
1297     {
1298         return handler->GetImageCount(stream);
1299     }
1300     else
1301     {
1302         wxLogError(_("Image file is not of type %d."), type);
1303         return 0;
1304     }
1305 }
1306
1307 bool wxImage::LoadFile( wxInputStream& stream, long type, int index )
1308 {
1309     UnRef();
1310
1311     m_refData = new wxImageRefData;
1312
1313     wxImageHandler *handler;
1314
1315     if ( type == wxBITMAP_TYPE_ANY )
1316     {
1317         wxList &list=GetHandlers();
1318
1319         for ( wxList::compatibility_iterator node = list.GetFirst(); node; node = node->GetNext() )
1320         {
1321              handler=(wxImageHandler*)node->GetData();
1322              if ( handler->CanRead(stream) )
1323                  return handler->LoadFile(this, stream, true/*verbose*/, index);
1324
1325         }
1326
1327         wxLogWarning( _("No handler found for image type.") );
1328         return false;
1329     }
1330
1331     handler = FindHandler(type);
1332
1333     if (handler == 0)
1334     {
1335         wxLogWarning( _("No image handler for type %d defined."), type );
1336
1337         return false;
1338     }
1339
1340     return handler->LoadFile(this, stream, true/*verbose*/, index);
1341 }
1342
1343 bool wxImage::LoadFile( wxInputStream& stream, const wxString& mimetype, int index )
1344 {
1345     UnRef();
1346
1347     m_refData = new wxImageRefData;
1348
1349     wxImageHandler *handler = FindHandlerMime(mimetype);
1350
1351     if (handler == 0)
1352     {
1353         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1354
1355         return false;
1356     }
1357
1358     return handler->LoadFile( this, stream, true/*verbose*/, index );
1359 }
1360
1361 bool wxImage::SaveFile( wxOutputStream& stream, int type ) const
1362 {
1363     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1364
1365     wxImageHandler *handler = FindHandler(type);
1366
1367     if (handler == 0)
1368     {
1369         wxLogWarning( _("No image handler for type %d defined."), type );
1370
1371         return false;
1372     }
1373
1374     return handler->SaveFile( (wxImage*)this, stream );
1375 }
1376
1377 bool wxImage::SaveFile( wxOutputStream& stream, const wxString& mimetype ) const
1378 {
1379     wxCHECK_MSG( Ok(), false, wxT("invalid image") );
1380
1381     wxImageHandler *handler = FindHandlerMime(mimetype);
1382
1383     if (handler == 0)
1384     {
1385         wxLogWarning( _("No image handler for type %s defined."), mimetype.GetData() );
1386
1387         return false;
1388     }
1389
1390     return handler->SaveFile( (wxImage*)this, stream );
1391 }
1392 #endif // wxUSE_STREAMS
1393
1394 void wxImage::AddHandler( wxImageHandler *handler )
1395 {
1396     // Check for an existing handler of the type being added.
1397     if (FindHandler( handler->GetType() ) == 0)
1398     {
1399         sm_handlers.Append( handler );
1400     }
1401     else
1402     {
1403         // This is not documented behaviour, merely the simplest 'fix'
1404         // for preventing duplicate additions.  If someone ever has
1405         // a good reason to add and remove duplicate handlers (and they
1406         // may) we should probably refcount the duplicates.
1407         //   also an issue in InsertHandler below.
1408
1409         wxLogDebug( _T("Adding duplicate image handler for '%s'"),
1410                     handler->GetName().c_str() );
1411         delete handler;
1412     }
1413 }
1414
1415 void wxImage::InsertHandler( wxImageHandler *handler )
1416 {
1417     // Check for an existing handler of the type being added.
1418     if (FindHandler( handler->GetType() ) == 0)
1419     {
1420         sm_handlers.Insert( handler );
1421     }
1422     else
1423     {
1424         // see AddHandler for additional comments.
1425         wxLogDebug( _T("Inserting duplicate image handler for '%s'"),
1426                     handler->GetName().c_str() );
1427         delete handler;
1428     }
1429 }
1430
1431 bool wxImage::RemoveHandler( const wxString& name )
1432 {
1433     wxImageHandler *handler = FindHandler(name);
1434     if (handler)
1435     {
1436         sm_handlers.DeleteObject(handler);
1437         delete handler;
1438         return true;
1439     }
1440     else
1441         return false;
1442 }
1443
1444 wxImageHandler *wxImage::FindHandler( const wxString& name )
1445 {
1446     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1447     while (node)
1448     {
1449         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1450         if (handler->GetName().Cmp(name) == 0) return handler;
1451
1452         node = node->GetNext();
1453     }
1454     return 0;
1455 }
1456
1457 wxImageHandler *wxImage::FindHandler( const wxString& extension, long bitmapType )
1458 {
1459     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1460     while (node)
1461     {
1462         wxImageHandler *handler = (wxImageHandler*)node->GetData();
1463         if ( (handler->GetExtension().Cmp(extension) == 0) &&
1464             (bitmapType == -1 || handler->GetType() == bitmapType) )
1465             return handler;
1466         node = node->GetNext();
1467     }
1468     return 0;
1469 }
1470
1471 wxImageHandler *wxImage::FindHandler( long bitmapType )
1472 {
1473     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1474     while (node)
1475     {
1476         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1477         if (handler->GetType() == bitmapType) return handler;
1478         node = node->GetNext();
1479     }
1480     return 0;
1481 }
1482
1483 wxImageHandler *wxImage::FindHandlerMime( const wxString& mimetype )
1484 {
1485     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1486     while (node)
1487     {
1488         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1489         if (handler->GetMimeType().IsSameAs(mimetype, false)) return handler;
1490         node = node->GetNext();
1491     }
1492     return 0;
1493 }
1494
1495 void wxImage::InitStandardHandlers()
1496 {
1497 #if wxUSE_STREAMS
1498     AddHandler(new wxBMPHandler);
1499 #endif // wxUSE_STREAMS
1500 }
1501
1502 void wxImage::CleanUpHandlers()
1503 {
1504     wxList::compatibility_iterator node = sm_handlers.GetFirst();
1505     while (node)
1506     {
1507         wxImageHandler *handler = (wxImageHandler *)node->GetData();
1508         wxList::compatibility_iterator next = node->GetNext();
1509         delete handler;
1510         node = next;
1511     }
1512
1513     sm_handlers.Clear();
1514 }
1515
1516 wxString wxImage::GetImageExtWildcard()
1517 {
1518     wxString fmts;
1519
1520     wxList& Handlers = wxImage::GetHandlers();
1521     wxList::compatibility_iterator Node = Handlers.GetFirst();
1522     while ( Node )
1523     {
1524         wxImageHandler* Handler = (wxImageHandler*)Node->GetData();
1525         fmts += wxT("*.") + Handler->GetExtension();
1526         Node = Node->GetNext();
1527         if ( Node ) fmts += wxT(";");
1528     }
1529
1530     return wxT("(") + fmts + wxT(")|") + fmts;
1531 }
1532
1533 //-----------------------------------------------------------------------------
1534 // wxImageHandler
1535 //-----------------------------------------------------------------------------
1536
1537 IMPLEMENT_ABSTRACT_CLASS(wxImageHandler,wxObject)
1538
1539 #if wxUSE_STREAMS
1540 bool wxImageHandler::LoadFile( wxImage *WXUNUSED(image), wxInputStream& WXUNUSED(stream), bool WXUNUSED(verbose), int WXUNUSED(index) )
1541 {
1542     return false;
1543 }
1544
1545 bool wxImageHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
1546 {
1547     return false;
1548 }
1549
1550 int wxImageHandler::GetImageCount( wxInputStream& WXUNUSED(stream) )
1551 {
1552     return 1;
1553 }
1554
1555 bool wxImageHandler::CanRead( const wxString& name )
1556 {
1557     if (wxFileExists(name))
1558     {
1559         wxFileInputStream stream(name);
1560         return CanRead(stream);
1561     }
1562
1563     wxLogError( _("Can't check image format of file '%s': file does not exist."), name.c_str() );
1564
1565     return false;
1566 }
1567
1568 bool wxImageHandler::CallDoCanRead(wxInputStream& stream)
1569 {
1570     wxFileOffset posOld = stream.TellI();
1571     if ( posOld == wxInvalidOffset )
1572     {
1573         // can't test unseekable stream
1574         return false;
1575     }
1576
1577     bool ok = DoCanRead(stream);
1578
1579     // restore the old position to be able to test other formats and so on
1580     if ( stream.SeekI(posOld) == wxInvalidOffset )
1581     {
1582         wxLogDebug(_T("Failed to rewind the stream in wxImageHandler!"));
1583
1584         // reading would fail anyhow as we're not at the right position
1585         return false;
1586     }
1587
1588     return ok;
1589 }
1590
1591 #endif // wxUSE_STREAMS
1592
1593 // ----------------------------------------------------------------------------
1594 // image histogram stuff
1595 // ----------------------------------------------------------------------------
1596
1597 bool
1598 wxImageHistogram::FindFirstUnusedColour(unsigned char *r,
1599                                         unsigned char *g,
1600                                         unsigned char *b,
1601                                         unsigned char r2,
1602                                         unsigned char b2,
1603                                         unsigned char g2) const
1604 {
1605     unsigned long key = MakeKey(r2, g2, b2);
1606
1607     while ( find(key) != end() )
1608     {
1609         // color already used
1610         r2++;
1611         if ( r2 >= 255 )
1612         {
1613             r2 = 0;
1614             g2++;
1615             if ( g2 >= 255 )
1616             {
1617                 g2 = 0;
1618                 b2++;
1619                 if ( b2 >= 255 )
1620                 {
1621                     wxLogError(_("No unused colour in image.") );
1622                     return false;
1623                 }
1624             }
1625         }
1626
1627         key = MakeKey(r2, g2, b2);
1628     }
1629
1630     if ( r )
1631         *r = r2;
1632     if ( g )
1633         *g = g2;
1634     if ( b )
1635         *b = b2;
1636
1637     return true;
1638 }
1639
1640 bool
1641 wxImage::FindFirstUnusedColour(unsigned char *r,
1642                                unsigned char *g,
1643                                unsigned char *b,
1644                                unsigned char r2,
1645                                unsigned char b2,
1646                                unsigned char g2) const
1647 {
1648     wxImageHistogram histogram;
1649
1650     ComputeHistogram(histogram);
1651
1652     return histogram.FindFirstUnusedColour(r, g, b, r2, g2, b2);
1653 }
1654
1655
1656
1657 // GRG, Dic/99
1658 // Counts and returns the number of different colours. Optionally stops
1659 // when it exceeds 'stopafter' different colours. This is useful, for
1660 // example, to see if the image can be saved as 8-bit (256 colour or
1661 // less, in this case it would be invoked as CountColours(256)). Default
1662 // value for stopafter is -1 (don't care).
1663 //
1664 unsigned long wxImage::CountColours( unsigned long stopafter ) const
1665 {
1666     wxHashTable h;
1667     wxObject dummy;
1668     unsigned char r, g, b;
1669     unsigned char *p;
1670     unsigned long size, nentries, key;
1671
1672     p = GetData();
1673     size = GetWidth() * GetHeight();
1674     nentries = 0;
1675
1676     for (unsigned long j = 0; (j < size) && (nentries <= stopafter) ; j++)
1677     {
1678         r = *(p++);
1679         g = *(p++);
1680         b = *(p++);
1681         key = wxImageHistogram::MakeKey(r, g, b);
1682
1683         if (h.Get(key) == NULL)
1684         {
1685             h.Put(key, &dummy);
1686             nentries++;
1687         }
1688     }
1689
1690     return nentries;
1691 }
1692
1693
1694 unsigned long wxImage::ComputeHistogram( wxImageHistogram &h ) const
1695 {
1696     unsigned char *p = GetData();
1697     unsigned long nentries = 0;
1698
1699     h.clear();
1700
1701     const unsigned long size = GetWidth() * GetHeight();
1702
1703     unsigned char r, g, b;
1704     for ( unsigned long n = 0; n < size; n++ )
1705     {
1706         r = *p++;
1707         g = *p++;
1708         b = *p++;
1709
1710         wxImageHistogramEntry& entry = h[wxImageHistogram::MakeKey(r, g, b)];
1711
1712         if ( entry.value++ == 0 )
1713             entry.index = nentries++;
1714     }
1715
1716     return nentries;
1717 }
1718
1719 /*
1720  * Rotation code by Carlos Moreno
1721  */
1722
1723 // GRG: I've removed wxRotationPoint - we already have wxRealPoint which
1724 //      does exactly the same thing. And I also got rid of wxRotationPixel
1725 //      bacause of potential problems in architectures where alignment
1726 //      is an issue, so I had to rewrite parts of the code.
1727
1728 static const double gs_Epsilon = 1e-10;
1729
1730 static inline int wxCint (double x)
1731 {
1732     return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
1733 }
1734
1735
1736 // Auxiliary function to rotate a point (x,y) with respect to point p0
1737 // make it inline and use a straight return to facilitate optimization
1738 // also, the function receives the sine and cosine of the angle to avoid
1739 // repeating the time-consuming calls to these functions -- sin/cos can
1740 // be computed and stored in the calling function.
1741
1742 inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
1743 {
1744     return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
1745                         p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
1746 }
1747
1748 inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
1749 {
1750     return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
1751 }
1752
1753 wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
1754 {
1755     int i;
1756     angle = -angle;     // screen coordinates are a mirror image of "real" coordinates
1757
1758     bool has_alpha = HasAlpha();
1759
1760     // Create pointer-based array to accelerate access to wxImage's data
1761     unsigned char ** data = new unsigned char * [GetHeight()];
1762     data[0] = GetData();
1763     for (i = 1; i < GetHeight(); i++)
1764         data[i] = data[i - 1] + (3 * GetWidth());
1765
1766     // Same for alpha channel
1767     unsigned char ** alpha = NULL;
1768     if (has_alpha)
1769     {
1770         alpha = new unsigned char * [GetHeight()];
1771         alpha[0] = GetAlpha();
1772         for (i = 1; i < GetHeight(); i++)
1773             alpha[i] = alpha[i - 1] + GetWidth();
1774     }
1775
1776     // precompute coefficients for rotation formula
1777     // (sine and cosine of the angle)
1778     const double cos_angle = cos(angle);
1779     const double sin_angle = sin(angle);
1780
1781     // Create new Image to store the result
1782     // First, find rectangle that covers the rotated image;  to do that,
1783     // rotate the four corners
1784
1785     const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
1786
1787     wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
1788     wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
1789     wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
1790     wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
1791
1792     int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
1793     int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
1794     int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
1795     int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
1796
1797     // Create rotated image
1798     wxImage rotated (x2 - x1 + 1, y2 - y1 + 1, false);
1799     // With alpha channel
1800     if (has_alpha)
1801         rotated.SetAlpha();
1802
1803     if (offset_after_rotation != NULL)
1804     {
1805         *offset_after_rotation = wxPoint (x1, y1);
1806     }
1807
1808     // GRG: The rotated (destination) image is always accessed
1809     //      sequentially, so there is no need for a pointer-based
1810     //      array here (and in fact it would be slower).
1811     //
1812     unsigned char * dst = rotated.GetData();
1813
1814     unsigned char * alpha_dst = NULL;
1815     if (has_alpha)
1816         alpha_dst = rotated.GetAlpha();
1817
1818     // GRG: if the original image has a mask, use its RGB values
1819     //      as the blank pixel, else, fall back to default (black).
1820     //
1821     unsigned char blank_r = 0;
1822     unsigned char blank_g = 0;
1823     unsigned char blank_b = 0;
1824
1825     if (HasMask())
1826     {
1827         blank_r = GetMaskRed();
1828         blank_g = GetMaskGreen();
1829         blank_b = GetMaskBlue();
1830         rotated.SetMaskColour( blank_r, blank_g, blank_b );
1831     }
1832
1833     // Now, for each point of the rotated image, find where it came from, by
1834     // performing an inverse rotation (a rotation of -angle) and getting the
1835     // pixel at those coordinates
1836
1837     // GRG: I've taken the (interpolating) test out of the loops, so that
1838     //      it is done only once, instead of repeating it for each pixel.
1839
1840     int x;
1841     if (interpolating)
1842     {
1843         for (int y = 0; y < rotated.GetHeight(); y++)
1844         {
1845             for (x = 0; x < rotated.GetWidth(); x++)
1846             {
1847                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
1848
1849                 if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
1850                     -0.25 < src.y && src.y < GetHeight() - 0.75)
1851                 {
1852                     // interpolate using the 4 enclosing grid-points.  Those
1853                     // points can be obtained using floor and ceiling of the
1854                     // exact coordinates of the point
1855                         // C.M. 2000-02-17:  when the point is near the border, special care is required.
1856
1857                     int x1, y1, x2, y2;
1858
1859                     if (0 < src.x && src.x < GetWidth() - 1)
1860                     {
1861                         x1 = wxCint(floor(src.x));
1862                         x2 = wxCint(ceil(src.x));
1863                     }
1864                     else    // else means that x is near one of the borders (0 or width-1)
1865                     {
1866                         x1 = x2 = wxCint (src.x);
1867                     }
1868
1869                     if (0 < src.y && src.y < GetHeight() - 1)
1870                     {
1871                         y1 = wxCint(floor(src.y));
1872                         y2 = wxCint(ceil(src.y));
1873                     }
1874                     else
1875                     {
1876                         y1 = y2 = wxCint (src.y);
1877                     }
1878
1879                     // get four points and the distances (square of the distance,
1880                     // for efficiency reasons) for the interpolation formula
1881
1882                     // GRG: Do not calculate the points until they are
1883                     //      really needed -- this way we can calculate
1884                     //      just one, instead of four, if d1, d2, d3
1885                     //      or d4 are < gs_Epsilon
1886
1887                     const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
1888                     const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
1889                     const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
1890                     const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
1891
1892                     // Now interpolate as a weighted average of the four surrounding
1893                     // points, where the weights are the distances to each of those points
1894
1895                     // If the point is exactly at one point of the grid of the source
1896                     // image, then don't interpolate -- just assign the pixel
1897
1898                     if (d1 < gs_Epsilon)        // d1,d2,d3,d4 are positive -- no need for abs()
1899                     {
1900                         unsigned char *p = data[y1] + (3 * x1);
1901                         *(dst++) = *(p++);
1902                         *(dst++) = *(p++);
1903                         *(dst++) = *p;
1904
1905                         if (has_alpha)
1906                         {
1907                             unsigned char *p = alpha[y1] + x1;
1908                             *(alpha_dst++) = *p;
1909                         }
1910                     }
1911                     else if (d2 < gs_Epsilon)
1912                     {
1913                         unsigned char *p = data[y1] + (3 * x2);
1914                         *(dst++) = *(p++);
1915                         *(dst++) = *(p++);
1916                         *(dst++) = *p;
1917
1918                         if (has_alpha)
1919                         {
1920                             unsigned char *p = alpha[y1] + x2;
1921                             *(alpha_dst++) = *p;
1922                         }
1923                     }
1924                     else if (d3 < gs_Epsilon)
1925                     {
1926                         unsigned char *p = data[y2] + (3 * x2);
1927                         *(dst++) = *(p++);
1928                         *(dst++) = *(p++);
1929                         *(dst++) = *p;
1930
1931                         if (has_alpha)
1932                         {
1933                             unsigned char *p = alpha[y2] + x2;
1934                             *(alpha_dst++) = *p;
1935                         }
1936                     }
1937                     else if (d4 < gs_Epsilon)
1938                     {
1939                         unsigned char *p = data[y2] + (3 * x1);
1940                         *(dst++) = *(p++);
1941                         *(dst++) = *(p++);
1942                         *(dst++) = *p;
1943
1944                         if (has_alpha)
1945                         {
1946                             unsigned char *p = alpha[y2] + x1;
1947                             *(alpha_dst++) = *p;
1948                         }
1949                     }
1950                     else
1951                     {
1952                         // weights for the weighted average are proportional to the inverse of the distance
1953                         unsigned char *v1 = data[y1] + (3 * x1);
1954                         unsigned char *v2 = data[y1] + (3 * x2);
1955                         unsigned char *v3 = data[y2] + (3 * x2);
1956                         unsigned char *v4 = data[y2] + (3 * x1);
1957
1958                         const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
1959
1960                         // GRG: Unrolled.
1961
1962                         *(dst++) = (unsigned char)
1963                             ( (w1 * *(v1++) + w2 * *(v2++) +
1964                                w3 * *(v3++) + w4 * *(v4++)) /
1965                               (w1 + w2 + w3 + w4) );
1966                         *(dst++) = (unsigned char)
1967                             ( (w1 * *(v1++) + w2 * *(v2++) +
1968                                w3 * *(v3++) + w4 * *(v4++)) /
1969                               (w1 + w2 + w3 + w4) );
1970                         *(dst++) = (unsigned char)
1971                             ( (w1 * *v1 + w2 * *v2 +
1972                                w3 * *v3 + w4 * *v4) /
1973                               (w1 + w2 + w3 + w4) );
1974
1975                         if (has_alpha)
1976                         {
1977                             unsigned char *v1 = alpha[y1] + (x1);
1978                             unsigned char *v2 = alpha[y1] + (x2);
1979                             unsigned char *v3 = alpha[y2] + (x2);
1980                             unsigned char *v4 = alpha[y2] + (x1);
1981
1982                             *(alpha_dst++) = (unsigned char)
1983                                 ( (w1 * *v1 + w2 * *v2 +
1984                                    w3 * *v3 + w4 * *v4) /
1985                                   (w1 + w2 + w3 + w4) );
1986                         }
1987                     }
1988                 }
1989                 else
1990                 {
1991                     *(dst++) = blank_r;
1992                     *(dst++) = blank_g;
1993                     *(dst++) = blank_b;
1994
1995                     if (has_alpha)
1996                         *(alpha_dst++) = 0;
1997                 }
1998             }
1999         }
2000     }
2001     else    // not interpolating
2002     {
2003         for (int y = 0; y < rotated.GetHeight(); y++)
2004         {
2005             for (x = 0; x < rotated.GetWidth(); x++)
2006             {
2007                 wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
2008
2009                 const int xs = wxCint (src.x);      // wxCint rounds to the
2010                 const int ys = wxCint (src.y);      // closest integer
2011
2012                 if (0 <= xs && xs < GetWidth() &&
2013                     0 <= ys && ys < GetHeight())
2014                 {
2015                     unsigned char *p = data[ys] + (3 * xs);
2016                     *(dst++) = *(p++);
2017                     *(dst++) = *(p++);
2018                     *(dst++) = *p;
2019
2020                     if (has_alpha)
2021                     {
2022                         unsigned char *p = alpha[ys] + (xs);
2023                         *(alpha_dst++) = *p;
2024                     }
2025                 }
2026                 else
2027                 {
2028                     *(dst++) = blank_r;
2029                     *(dst++) = blank_g;
2030                     *(dst++) = blank_b;
2031
2032                     if (has_alpha)
2033                         *(alpha_dst++) = 255;
2034                 }
2035             }
2036         }
2037     }
2038
2039     delete [] data;
2040
2041     if (has_alpha)
2042         delete [] alpha;
2043
2044     return rotated;
2045 }
2046
2047
2048
2049
2050
2051 // A module to allow wxImage initialization/cleanup
2052 // without calling these functions from app.cpp or from
2053 // the user's application.
2054
2055 class wxImageModule: public wxModule
2056 {
2057 DECLARE_DYNAMIC_CLASS(wxImageModule)
2058 public:
2059     wxImageModule() {}
2060     bool OnInit() { wxImage::InitStandardHandlers(); return true; };
2061     void OnExit() { wxImage::CleanUpHandlers(); };
2062 };
2063
2064 IMPLEMENT_DYNAMIC_CLASS(wxImageModule, wxModule)
2065
2066
2067 #endif // wxUSE_IMAGE