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