src/mac/pnghand.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        pnghand.cpp
   3 // Purpose:     Implements a PNG reader class + handler
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #  pragma implementation "pngread.h"
  14 #  pragma implementation "pnghand.h"
  15 #endif
  16
  17 // For compilers that support precompilation, includes "wx.h".
  18 #include "wx/wxprec.h"
  19
  20 #ifdef __BORLANDC__
  21 #  pragma hdrstop
  22 #endif
  23
  24 #include <stdlib.h>
  25 #include <stdio.h>
  26 #include <string.h>
  27
  28 #if wxUSE_IOSTREAMH
  29 #   include <fstream.h>
  30 #else
  31 #   include <fstream>
  32 #endif
  33
  34 #ifndef __DARWIN__
  35 #  include <windows.h>
  36 #endif
  37 #include "wx/msgdlg.h"
  38 #include "wx/palette.h"
  39 #include "wx/bitmap.h"
  40 #include "wx/mac/pnghand.h"
  41 #include "wx/mac/pngread.h"
  42 #include "wx/mac/private.h"
  43
  44 extern "C" {
  45 #include "png.h"
  46 }
  47
  48 extern "C" void png_read_init PNGARG((png_structp png_ptr));
  49 extern "C" void png_write_init PNGARG((png_structp png_ptr));
  50
  51 extern CTabHandle wxMacCreateColorTable( int numColors ) ;
  52 extern void wxMacDestroyColorTable( CTabHandle colors )  ;
  53 extern void wxMacSetColorTableEntry( CTabHandle newColors , int index , int red , int green ,  int blue ) ;
  54 extern GWorldPtr wxMacCreateGWorld( int width , int height , int depth ) ;
  55 extern void wxMacDestroyGWorld( GWorldPtr gw ) ;
  56
  57 void
  58 ima_png_error(png_struct *png_ptr, char *message)
  59 {
  60         wxMessageBox(message, "PNG error");
  61   longjmp(png_ptr->jmpbuf, 1);
  62 }
  63
  64
  65 // static wxGifReaderIter* iter;
  66 wxPalette *wxCopyPalette(const wxPalette *cmap);
  67
  68 wxPNGReader::wxPNGReader(void)
  69 {
  70   filetype = 0;
  71   RawImage = NULL;      //  Image data
  72
  73   Width = 0; Height = 0;       //  Dimensions
  74   Depth = 0;           // (bits x pixel)
  75   ColorType = 0;        // Bit 1 = Palette used
  76                   // Bit 2 = Color used
  77                   // Bit 3 = Alpha used
  78
  79   EfeWidth = 0;         // Efective Width
  80
  81   lpbi = NULL;
  82   bgindex = -1;
  83   m_palette = 0;
  84   imageOK = FALSE;
  85 }
  86
  87 wxPNGReader::wxPNGReader ( char* ImageFileName )
  88 {
  89   imageOK = FALSE;
  90   filetype = 0;
  91   RawImage = NULL;      //  Image data
  92
  93   Width = 0; Height = 0;       //  Dimensions
  94   Depth = 0;           // (bits x pixel)
  95   ColorType = 0;        // Bit 1 = m_palette used
  96                   // Bit 2 = Color used
  97                   // Bit 3 = Alpha used
  98
  99   EfeWidth = 0;         // Efective Width
 100
 101   lpbi = NULL;
 102   bgindex = -1;
 103   m_palette = 0;
 104
 105   imageOK = ReadFile (ImageFileName);
 106 }
 107
 108 void
 109 wxPNGReader::Create(int width, int height, int depth, int colortype)
 110 {
 111   Width = width; Height = height; Depth = depth;
 112   ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);
 113   delete m_palette;
 114   delete[] RawImage ;
 115   RawImage = 0;
 116   m_palette = 0;
 117
 118   if (lpbi)
 119   {
 120         wxMacDestroyGWorld( (GWorldPtr) lpbi ) ;
 121   }
 122   lpbi = wxMacCreateGWorld( Width , Height , Depth);
 123   if (lpbi)
 124   {
 125     EfeWidth = (long)(((long)Width*Depth + 31) / 32) * 4;
 126     int bitwidth = width ;
 127     if ( EfeWidth > bitwidth )
 128         bitwidth = EfeWidth ;
 129
 130                 RawImage = (byte*) new char[ ( bitwidth * Height * ((Depth+7)>>3) ) ];
 131     imageOK = TRUE;
 132   }
 133 }
 134
 135 wxPNGReader::~wxPNGReader ( )
 136 {
 137         delete[] RawImage ;
 138   if (lpbi)  {
 139         wxMacDestroyGWorld( (GWorldPtr) lpbi ) ;
 140   }
 141   delete m_palette;
 142 }
 143
 144
 145 int wxPNGReader::GetIndex(int x, int y)
 146 {
 147   if (!Inside(x, y) || (Depth>8)) return -1;
 148
 149   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 150   int index = (int)(*ImagePointer);
 151   return index;
 152 }
 153
 154 bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
 155 {
 156   if (!Inside(x, y)) return FALSE;
 157
 158   if (m_palette) {
 159    return m_palette->GetRGB(GetIndex(x, y), r, g, b);
 160 /*   PALETTEENTRY entry;
 161    ::GetPaletteEntries((HPALETTE) m_palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
 162    *r = entry.peRed;
 163    *g = entry.peGreen;
 164    *b = entry.peBlue;  */
 165   } else {
 166    ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 167    *b = ImagePointer[0];
 168    *g = ImagePointer[1];
 169    *r = ImagePointer[2];
 170   }
 171   return TRUE;
 172 }
 173
 174
 175 bool wxPNGReader::SetIndex(int x, int y, int index)
 176 {
 177   if (!Inside(x, y) || (Depth>8)) return FALSE;
 178
 179   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 180   *ImagePointer = index;
 181
 182   return TRUE;
 183 }
 184
 185 bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
 186 {
 187   if (!Inside(x, y)) return FALSE;
 188
 189   if (ColorType & COLORTYPE_PALETTE)
 190   {
 191    if (!m_palette) return FALSE;
 192    SetIndex(x, y, m_palette->GetPixel(r, g, b));
 193
 194   } else {
 195    ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 196    ImagePointer[0] = b;
 197    ImagePointer[1] = g;
 198    ImagePointer[2] = r;
 199   }
 200
 201   return TRUE;
 202 }
 203
 204 bool wxPNGReader::SetPalette(wxPalette* colourmap)
 205 {
 206   delete m_palette ;
 207   if (!colourmap)
 208    return FALSE;
 209   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 210   m_palette = new wxPalette( *colourmap );
 211         return true ;
 212 //  return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 213 }
 214
 215 bool
 216 wxPNGReader::SetPalette(int n, byte *r, byte *g, byte *b)
 217 {
 218   delete m_palette ;
 219   m_palette = new wxPalette();
 220   if (!m_palette)
 221    return FALSE;
 222
 223   if (!g) g = r;
 224   if (!b) b = g;
 225   m_palette->Create(n, r, g, b);
 226   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 227         return true ;
 228 //    return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 229 }
 230
 231 bool
 232 wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
 233 {
 234   delete m_palette ;
 235   m_palette = new wxPalette();
 236   if (!m_palette)
 237    return FALSE;
 238
 239   byte r[256], g[256], b[256];
 240
 241   for(int i=0; i<n; i++)
 242   {
 243    r[i] = rgb_struct[i].red;
 244    g[i] = rgb_struct[i].green;
 245    b[i] = rgb_struct[i].blue;
 246   }
 247   // Added by JACS copying from Andrew Davison's additions
 248   // to GIF-reading code
 249   // Make transparency colour black...
 250   if (bgindex != -1)
 251     r[bgindex] = g[bgindex] = b[bgindex] = 0;
 252
 253   m_palette->Create(n, r, g, b);
 254   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 255         return true ;
 256 //    return (DibSetUsage(lpbi, (HPALETTE) m_palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 257 }
 258
 259 void wxPNGReader::NullData()
 260 {
 261   if (lpbi)  {
 262         wxMacDestroyGWorld( (GWorldPtr) lpbi ) ;
 263   }
 264   delete m_palette;
 265   lpbi = NULL;
 266   m_palette = NULL;
 267 }
 268
 269 wxBitmap* wxPNGReader::GetBitmap(void)
 270 {
 271     wxBitmap *bitmap = new wxBitmap;
 272     if ( InstantiateBitmap(bitmap) )
 273         return bitmap;
 274     else
 275     {
 276         delete bitmap;
 277         return NULL;
 278     }
 279 }
 280
 281 bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
 282 {
 283     if ( lpbi )
 284     {
 285       bitmap->SetHBITMAP((WXHBITMAP) lpbi);
 286       bitmap->SetWidth(GetWidth());
 287       bitmap->SetHeight(GetHeight());
 288       bitmap->SetDepth(GetDepth());
 289       if ( GetDepth() > 1 && m_palette )
 290         bitmap->SetPalette(*m_palette);
 291       bitmap->SetOk(TRUE);
 292
 293
 294       // Make a mask if appropriate
 295       /*
 296       if ( bgindex > -1 )
 297       {
 298         wxMask *mask = CreateMask();
 299         bitmap->SetMask(mask);
 300       }
 301       */
 302       lpbi = NULL ; // bitmap has taken over ownership
 303                 return TRUE;
 304     }
 305     else
 306     {
 307       return FALSE;
 308     }
 309 /*
 310   HDC dc = ::CreateCompatibleDC(NULL);
 311
 312   if (dc)
 313   {
 314         // tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
 315         // is a memory dc that must have a bitmap selected into it)
 316         HDC dc2 = GetDC(NULL);
 317         HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
 318         ReleaseDC(NULL, dc2);
 319         HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, tmpBitmap);
 320
 321         if ( m_palette )
 322         {
 323             HPALETTE oldPal = ::SelectPalette(dc, (HPALETTE) m_palette->GetHPALETTE(), FALSE);
 324         ::RealizePalette(dc);
 325         }
 326
 327     HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
 328         CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);
 329
 330         ::SelectPalette(dc, NULL, TRUE);
 331         ::SelectObject(dc, oldBitmap);
 332         ::DeleteObject(tmpBitmap);
 333         ::DeleteDC(dc);
 334
 335         if ( hBitmap )
 336         {
 337           bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
 338           bitmap->SetWidth(GetWidth());
 339           bitmap->SetHeight(GetHeight());
 340           bitmap->SetDepth(GetDepth());
 341           if ( GetDepth() > 1 && m_palette )
 342             bitmap->SetPalette(*m_palette);
 343           bitmap->SetOk(TRUE);
 344
 345
 346           // Make a mask if appropriate
 347           if ( bgindex > -1 )
 348           {
 349             wxMask *mask = CreateMask();
 350             bitmap->SetMask(mask);
 351           }
 352       return TRUE;
 353         }
 354         else
 355         {
 356           return FALSE;
 357         }
 358   }
 359   else
 360     {
 361     return FALSE;
 362     }
 363   */
 364   return false ;
 365 }
 366
 367 wxPalette *wxCopyPalette(const wxPalette *cmap)
 368 {
 369   wxPalette *newCmap = new wxPalette( *cmap ) ;
 370   return newCmap;
 371 }
 372
 373 wxMask *wxPNGReader::CreateMask(void)
 374 {
 375 /*
 376     HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);
 377
 378   HDC dc = ::CreateCompatibleDC(NULL);
 379     HBITMAP oldBitmap = (HBITMAP) ::SelectObject(dc, hBitmap);
 380
 381     int bgIndex = GetBGIndex();
 382
 383     int x,y;
 384
 385     for (x=0; x<GetWidth(); x++)
 386     {
 387         for (y=0; y<GetHeight(); y++)
 388         {
 389             int index = GetIndex(x, y);
 390             if ( index == bgIndex )
 391                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
 392             else
 393                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));
 394
 395       }
 396     }
 397     ::SelectObject(dc, oldBitmap);
 398     wxMask *mask = new wxMask;
 399     mask->SetMaskBitmap((WXHBITMAP) hBitmap);
 400     return mask;
 401    */
 402    return NULL ;
 403 }
 404
 405 bool wxPNGReader::ReadFile(char * ImageFileName)
 406 {
 407   int number_passes;
 408
 409   if (ImageFileName)
 410    strcpy(filename, ImageFileName);
 411
 412   FILE *fp;
 413   png_struct *png_ptr;
 414    png_info *info_ptr;
 415   wxPNGReaderIter iter(this);
 416
 417   /* open the file */
 418   fp = fopen( ImageFileName , "rb" );
 419
 420   if (!fp)
 421     return FALSE;
 422
 423   /* allocate the necessary structures */
 424   png_ptr = new (png_struct);
 425   if (!png_ptr)
 426   {
 427     fclose(fp);
 428     return FALSE;
 429   }
 430
 431   info_ptr = new (png_info);
 432   if (!info_ptr)
 433   {
 434     fclose(fp);
 435     delete(png_ptr);
 436     return FALSE;
 437   }
 438   /* set error handling */
 439   if (setjmp(png_ptr->jmpbuf))
 440   {
 441     png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 442     fclose(fp);
 443     delete(png_ptr);
 444     delete(info_ptr);
 445
 446     /* If we get here, we had a problem reading the file */
 447     return FALSE;
 448   }
 449         //png_set_error(ima_png_error, NULL);
 450
 451   /* initialize the structures, info first for error handling */
 452   png_info_init(info_ptr);
 453   png_read_init(png_ptr);
 454
 455   /* set up the input control */
 456   png_init_io(png_ptr, fp);
 457
 458   /* read the file information */
 459   png_read_info(png_ptr, info_ptr);
 460
 461   /* allocate the memory to hold the image using the fields
 462     of png_info. */
 463   png_color_16 my_background={ 0, 31, 127, 255, 0 };
 464
 465   if (info_ptr->valid & PNG_INFO_bKGD)
 466     {
 467     png_set_background(png_ptr, &(info_ptr->background),
 468       PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
 469         if ( info_ptr->num_palette > 0 )
 470             bgindex = info_ptr->background.index;
 471     }
 472   else   {
 473     png_set_background(png_ptr, &my_background,
 474       PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 475
 476         // Added by JACS: guesswork!
 477         if ( info_ptr->num_trans != 0 )
 478             bgindex = info_ptr->num_trans - 1 ;
 479    }
 480
 481   /* tell libpng to strip 16 bit depth files down to 8 bits */
 482   if (info_ptr->bit_depth == 16)
 483     png_set_strip_16(png_ptr);
 484
 485   int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
 486   Create(info_ptr->width, info_ptr->height, pixel_depth,
 487     info_ptr->color_type);
 488
 489   if (info_ptr->num_palette>0)
 490     {
 491       SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
 492     }
 493
 494   int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
 495  //  printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
 496 //  printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
 497
 498   byte *row_pointers = new byte[row_stride];
 499
 500   /* turn on interlace handling */
 501   if (info_ptr->interlace_type)
 502     number_passes = png_set_interlace_handling(png_ptr);
 503   else
 504     number_passes = 1;
 505 //  printf("NP = %d ", number_passes);
 506
 507   for (int pass=0; pass< number_passes; pass++)
 508   {
 509           iter.upset();
 510           int y=0;
 511                 CGrafPtr        origPort ;
 512                 GDHandle        origDevice ;
 513
 514                 GetGWorld( &origPort , &origDevice ) ;
 515                 // ignore shapedc
 516                 SetGWorld( (GWorldPtr) lpbi , NULL ) ;
 517           do
 518           {
 519         //    (unsigned char *)iter.GetRow();
 520             if (info_ptr->interlace_type)
 521             {
 522              if (pass>0)
 523               iter.GetRow(row_pointers, row_stride);
 524              png_read_row(png_ptr, row_pointers, NULL);
 525             }
 526             else
 527              png_read_row(png_ptr, row_pointers, NULL);
 528
 529                         if ( info_ptr->palette )
 530                         {
 531                                 if ( pixel_depth == 8 )
 532                                 {
 533                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 534                                         {
 535                                                 png_color_struct* color ;
 536                                                 RGBColor col ;
 537
 538                                                 int index = row_pointers[i] ;
 539                                                 color = &info_ptr->palette[index] ;
 540                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 541                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 542                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 543                                                 SetCPixel( i, y, &col);
 544                                         }
 545                                         /*
 546                                         png_color_struct* color ;
 547                                         RGBColor col ;
 548                                         unsigned char* p = &row_pointers[0] ;
 549                                         PenNormal() ;
 550                                         MoveTo( 0 , y ) ;
 551                                         int index = *p ;
 552                                         color = &info_ptr->palette[index] ;
 553                                         col.red = (color->red << 8) | color->red ;
 554                                         col.green = (color->green << 8) | color->green ;
 555                                         col.blue = (color->blue << 8) | color->blue ;
 556                                         RGBForeColor( &col ) ;
 557                                         col.red = col.green = col.blue = 0xFFFF ;
 558                                         RGBBackColor( &col ) ;
 559                                         for ( int i = 0 ; i < info_ptr->width ; ++i , ++p)
 560                                         {
 561                                                 if ( *p != index )
 562                                                 {
 563                                                         LineTo( i , y ) ;
 564                                                         index = *p ;
 565                                                         color = &info_ptr->palette[index] ;
 566                                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 567                                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 568                                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 569                                                         RGBForeColor( &col ) ;
 570                                                 }
 571                                         }
 572                                         LineTo( info_ptr->width  , y ) ;
 573                                         */
 574                                 }
 575                                 else
 576                                 {
 577                                         for ( int i = 0 ; i < info_ptr->width ; ++i )
 578                                         {
 579                                                 png_color_struct* color ;
 580                                                 RGBColor col ;
 581
 582                                                 int byte = ( i * pixel_depth ) / 8 ;
 583                                                 int offset = ( 8 - pixel_depth ) - ( i * pixel_depth ) % 8 ;
 584
 585                                                 int index = ( row_pointers[byte] >> offset ) & ( 0xFF >> ( 8 - pixel_depth ) );
 586                                                 color = &info_ptr->palette[index] ;
 587                                                 col.red = (((int)color->red) << 8) | ((int)color->red) ;
 588                                                 col.green = (((int)color->green) << 8) | ((int)color->green) ;
 589                                                 col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 590                                                 SetCPixel( i, y, &col);
 591                                         }
 592                                 }
 593                         }
 594                         else
 595                         {
 596                                 for ( int i = 0 ; i < info_ptr->width ; ++i )
 597                                 {
 598                                         png_color_struct* color ;
 599                                         RGBColor col ;
 600                                         color =(png_color_struct*) (&row_pointers[i*3]) ;
 601                                         col.red = (((int)color->red) << 8) | ((int)color->red) ;
 602                                         col.green = (((int)color->green) << 8) | ((int)color->green) ;
 603                                         col.blue = (((int)color->blue) << 8) | ((int)color->blue) ;
 604                                         SetCPixel( i, y, &col);
 605                                 }
 606                         }
 607                         if (number_passes)
 608                                 iter.SetRow(row_pointers, row_stride);
 609             y++;
 610           }
 611           while(iter.PrevRow());
 612           SetGWorld( origPort , origDevice ) ;
 613
 614 //  printf("Y=%d ",y);
 615   }
 616   delete[] row_pointers;
 617
 618   /* read the rest of the file, getting any additional chunks
 619     in info_ptr */
 620   png_read_end(png_ptr, info_ptr);
 621
 622   /* clean up after the read, and free any memory allocated */
 623   png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 624
 625   /* free the structures */
 626   delete(png_ptr);
 627   delete(info_ptr);
 628
 629   /* close the file */
 630   fclose(fp);
 631
 632   /* that's it */
 633   return TRUE;
 634 }
 635
 636
 637 /* write a png file */
 638
 639 bool wxPNGReader::SaveFile(char * ImageFileName)
 640 {
 641   if (ImageFileName)
 642    strcpy(filename, ImageFileName);
 643
 644   wxPNGReaderIter iter(this);
 645   FILE *fp;
 646    png_struct *png_ptr;
 647   png_info *info_ptr;
 648
 649    /* open the file */
 650   fp = fopen(filename, "wb");
 651   if (!fp)
 652     return FALSE;
 653
 654   /* allocate the necessary structures */
 655   png_ptr = new (png_struct);
 656   if (!png_ptr)
 657   {
 658     fclose(fp);
 659     return FALSE;
 660   }
 661
 662   info_ptr = new (png_info);
 663   if (!info_ptr)
 664   {
 665     fclose(fp);
 666     delete(png_ptr);
 667     return FALSE;
 668   }
 669
 670   /* set error handling */
 671   if (setjmp(png_ptr->jmpbuf))
 672   {
 673     png_write_destroy(png_ptr);
 674     fclose(fp);
 675     delete(png_ptr);
 676     delete(info_ptr);
 677
 678     /* If we get here, we had a problem reading the file */
 679     return FALSE;
 680   }
 681         //png_set_error(ima_png_error, NULL);
 682
 683 //  printf("writig pg %s ", filename);
 684    /* initialize the structures */
 685   png_info_init(info_ptr);
 686   png_write_init(png_ptr);
 687
 688   int row_stride = GetWidth() * ((GetDepth()+7)>>3);
 689   /* set up the output control */
 690    png_init_io(png_ptr, fp);
 691
 692   /* set the file information here */
 693   info_ptr->width = GetWidth();
 694   info_ptr->height = GetHeight();
 695   info_ptr->pixel_depth = GetDepth();
 696   info_ptr->channels = (GetDepth()>8) ? 3: 1;
 697   info_ptr->bit_depth = GetDepth()/info_ptr->channels;
 698   info_ptr->color_type = GetColorType();
 699   info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
 700   info_ptr->valid = 0;
 701   info_ptr->rowbytes = row_stride;
 702
 703
 704 // printf("P = %d D = %d RS= %d GD= %d CH= %d ", info_ptr->pixel_depth, info_ptr->bit_depth, row_stride, GetDepth(), info_ptr->channels);
 705   /* set the palette if there is one */
 706   if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
 707   {
 708 //    printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 709     info_ptr->valid |= PNG_INFO_PLTE;
 710     info_ptr->palette = new png_color[256];
 711     info_ptr->num_palette = 256;
 712     for (int i=0; i<256; i++)
 713      GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
 714   }
 715 //    printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 716
 717
 718    /* optional significant bit chunk */
 719 //   info_ptr->valid |= PNG_INFO_sBIT;
 720 //   info_ptr->sig_bit = true_bit_depth;
 721
 722   /* optional gamma chunk */
 723 //   info_ptr->valid |= PNG_INFO_gAMA;
 724 //   info_ptr->gamma = gamma;
 725
 726   /* other optional chunks */
 727
 728    /* write the file information */
 729    png_write_info(png_ptr, info_ptr);
 730
 731    /* set up the transformations you want.  Note that these are
 732       all optional.  Only call them if you want them */
 733
 734   /* shift the pixels up to a legal bit depth and fill in
 735       as appropriate to correctly scale the image */
 736 //   png_set_shift(png_ptr, &(info_ptr->sig_bit));
 737
 738   /* pack pixels into bytes */
 739 //   png_set_packing(png_ptr);
 740
 741   /* flip bgr pixels to rgb */
 742 //   png_set_bgr(png_ptr);
 743
 744    /* swap bytes of 16 bit files to most significant bit first */
 745 //   png_set_swap(png_ptr);
 746
 747    /* get rid of filler bytes, pack rgb into 3 bytes */
 748 //   png_set_rgbx(png_ptr);
 749
 750 /* If you are only writing one row at a time, this works */
 751
 752   byte *row_pointers = new byte[row_stride];
 753     iter.upset();
 754   do  {
 755 //    (unsigned char *)iter.GetRow();
 756     iter.GetRow(row_pointers, row_stride);
 757     png_write_row(png_ptr, row_pointers);
 758   } while(iter.PrevRow());
 759
 760         delete[] row_pointers;
 761
 762 /* write the rest of the file */
 763    png_write_end(png_ptr, info_ptr);
 764
 765   /* clean up after the write, and free any memory allocated */
 766    png_write_destroy(png_ptr);
 767
 768    /* if you malloced the palette, free it here */
 769    if (info_ptr->palette)
 770     delete[] (info_ptr->palette);
 771
 772   /* free the structures */
 773   delete(png_ptr);
 774   delete(info_ptr);
 775
 776   /* close the file */
 777   fclose(fp);
 778
 779   /* that's it */
 780   return TRUE;
 781 }
 782
 783 static int Power(int x, int y)
 784 {
 785     int z = 1;
 786     int i;
 787     for ( i = 0; i < y; i++)
 788     {
 789         z *= x;
 790     }
 791     return z;
 792 }
 793
 794 static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
 795   'C', 'D', 'E', 'F' };
 796
 797 static void DecToHex(int dec, char *buf)
 798 {
 799   int firstDigit = (int)(dec/16.0);
 800   int secondDigit = (int)(dec - (firstDigit*16.0));
 801   buf[0] = hexArray[firstDigit];
 802   buf[1] = hexArray[secondDigit];
 803   buf[2] = 0;
 804 }
 805
 806
 807 bool wxPNGReader::SaveXPM(char *filename, char *name)
 808 {
 809     char nameStr[256];
 810     if ( name )
 811         strcpy(nameStr, name);
 812     else
 813     {
 814         strcpy(nameStr, filename);
 815         wxStripExtension(nameStr);
 816     }
 817
 818     if ( GetDepth() > 4 )
 819     {
 820         // Only a depth of 4 and below allowed
 821         return FALSE;
 822     }
 823
 824     if ( !GetPalette() )
 825         return FALSE;
 826
 827     wxSTD ofstream str(filename);
 828     if ( str.bad() )
 829         return FALSE;
 830
 831     int noColours = Power(2, GetDepth());
 832
 833     // Output header
 834     str << "/* XPM */\n";
 835     str << "static char * " << nameStr << "_xpm[] = {\n";
 836     str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";
 837
 838     // Output colourmap
 839     int base = 97 ; // start from 'a'
 840
 841     unsigned char red, green, blue;
 842     char hexBuf[4];
 843     int i;
 844     for ( i = 0; i < noColours; i ++)
 845     {
 846         str << "\"" << (char)(base + i) << "      c #";
 847         GetPalette()->GetRGB(i, &red, &green, &blue);
 848         DecToHex(red, hexBuf);
 849         str << hexBuf;
 850         DecToHex(green, hexBuf);
 851         str << hexBuf;
 852         DecToHex(blue, hexBuf);
 853         str << hexBuf;
 854         str << "\",\n";
 855     }
 856
 857     // Output the data
 858     int x, y;
 859     for ( y = 0; y < GetHeight(); y++)
 860     {
 861         str << "\"";
 862         for ( x = 0; x < GetWidth(); x++)
 863         {
 864             int index = GetIndex(x, y);
 865             str << (char)(base + index) ;
 866         }
 867         str << "\",\n";
 868     }
 869
 870     str << "};\n";
 871     str.flush();
 872
 873     return TRUE;
 874 }
 875
 876
 877 IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)
 878
 879 bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
 880     int desiredWidth, int desiredHeight)
 881 {
 882     wxPNGReader reader;
 883     if (reader.ReadFile((char*) (const char*) name))
 884     {
 885         return reader.InstantiateBitmap(bitmap);
 886     }
 887     else
 888         return FALSE;
 889 }
 890
 891 bool wxPNGFileHandler::SaveFile(const wxBitmap *bitmap, const wxString& name, int type, const wxPalette *pal)
 892 {
 893     return FALSE;
 894 }
 895
 896