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