src/msw/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 #include <fstream.h>
  28 #include <windows.h>
  29 #include <wx/msw/pngread.h>
  30 #include <wx/msw/dibutils.h>
  31
  32 extern "C" {
  33 #include "png.h"
  34 }
  35
  36 extern "C" void png_read_init PNGARG((png_structp png_ptr));
  37 extern "C" void png_write_init PNGARG((png_structp png_ptr));
  38
  39 #ifndef GlobalAllocPtr
  40 #define     GlobalPtrHandle(lp)         \
  41                 ((HGLOBAL)GlobalHandle(lp))
  42
  43 #define     GlobalLockPtr(lp)                \
  44                 ((BOOL)GlobalLock(GlobalPtrHandle(lp)))
  45 #define     GlobalUnlockPtr(lp)      \
  46                 GlobalUnlock(GlobalPtrHandle(lp))
  47
  48 #define     GlobalAllocPtr(flags, cb)        \
  49                 (GlobalLock(GlobalAlloc((flags), (cb))))
  50 #define     GlobalReAllocPtr(lp, cbNew, flags)       \
  51                 (GlobalUnlockPtr(lp), GlobalLock(GlobalReAlloc(GlobalPtrHandle(lp) , (cbNew), (flags))))
  52 #define     GlobalFreePtr(lp)                \
  53                 (GlobalUnlockPtr(lp), (BOOL)GlobalFree(GlobalPtrHandle(lp)))
  54 #endif
  55
  56
  57 void
  58 ima_png_error(png_struct *png_ptr, char *message)
  59 {
  60 //        wxMessageBox(message, "PNG error");
  61
  62         longjmp(png_ptr->jmpbuf, 1);
  63 }
  64
  65
  66 // static wxGifReaderIter* iter;
  67 wxPalette *wxCopyPalette(const wxPalette *cmap);
  68
  69 wxPNGReader::wxPNGReader(void)
  70 {
  71   filetype = 0;
  72   RawImage = NULL;              //  Image data
  73
  74   Width = 0; Height = 0;                //  Dimensions
  75   Depth = 0;                                    // (bits x pixel)
  76   ColorType = 0;                                // Bit 1 = Palette used
  77                                                                         // Bit 2 = Color used
  78                                                                         // Bit 3 = Alpha used
  79
  80   EfeWidth = 0;                         // Efective Width
  81
  82   lpbi = NULL;
  83   bgindex = -1;
  84   Palette = 0;
  85   imageOK = FALSE;
  86 }
  87
  88 wxPNGReader::wxPNGReader ( char* ImageFileName )
  89 {
  90   imageOK = FALSE;
  91   filetype = 0;
  92   RawImage = NULL;              //  Image data
  93
  94   Width = 0; Height = 0;                //  Dimensions
  95   Depth = 0;                                    // (bits x pixel)
  96   ColorType = 0;                                // Bit 1 = Palette used
  97                                                                         // Bit 2 = Color used
  98                                                                         // Bit 3 = Alpha used
  99
 100   EfeWidth = 0;                         // Efective Width
 101
 102   lpbi = NULL;
 103   bgindex = -1;
 104   Palette = 0;
 105
 106   imageOK = ReadFile (ImageFileName);
 107 }
 108
 109 void
 110 wxPNGReader::Create(int width, int height, int depth, int colortype)
 111 {
 112   Width = width; Height = height; Depth = depth;
 113   ColorType = (colortype>=0) ? colortype: ((Depth>8) ? COLORTYPE_COLOR: 0);
 114
 115   if (lpbi)  {
 116          GlobalFreePtr(lpbi);
 117 //       delete Palette;
 118   }
 119   RawImage = 0;
 120   Palette = 0;
 121   if (lpbi = DibCreate(Depth, Width, Height))  {
 122                 RawImage = (ImagePointerType)DibPtr(lpbi);
 123                 EfeWidth = (long)(((long)Width*Depth + 31) / 32) * 4;
 124         imageOK = TRUE;
 125   }
 126 }
 127
 128 wxPNGReader::~wxPNGReader ( )
 129 {
 130   if (lpbi)  {
 131          GlobalFreePtr(lpbi);
 132          delete Palette;
 133   }
 134 }
 135
 136
 137 int wxPNGReader::GetIndex(int x, int y)
 138 {
 139   if (!Inside(x, y) || (Depth>8)) return -1;
 140
 141   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 142   int index = (int)(*ImagePointer);
 143   return index;
 144 }
 145
 146 bool wxPNGReader::GetRGB(int x, int y, byte* r, byte* g, byte* b)
 147 {
 148   if (!Inside(x, y)) return FALSE;
 149
 150   if (Palette) {
 151          return Palette->GetRGB(GetIndex(x, y), r, g, b);
 152 /*       PALETTEENTRY entry;
 153          ::GetPaletteEntries((HPALETTE) Palette->GetHPALETTE(), GetIndex(x, y), 1, &entry);
 154          *r = entry.peRed;
 155          *g = entry.peGreen;
 156          *b = entry.peBlue;  */
 157   } else {
 158          ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 159          *b = ImagePointer[0];
 160          *g = ImagePointer[1];
 161          *r = ImagePointer[2];
 162   }
 163   return TRUE;
 164 }
 165
 166
 167 bool wxPNGReader::SetIndex(int x, int y, int index)
 168 {
 169   if (!Inside(x, y) || (Depth>8)) return FALSE;
 170
 171   ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 172   *ImagePointer = index;
 173
 174   return TRUE;
 175 }
 176
 177 bool wxPNGReader::SetRGB(int x, int y, byte r, byte g, byte b)
 178 {
 179   if (!Inside(x, y)) return FALSE;
 180
 181   if (ColorType & COLORTYPE_PALETTE)
 182   {
 183          if (!Palette) return FALSE;
 184          SetIndex(x, y, Palette->GetPixel(r, g, b));
 185
 186   } else {
 187          ImagePointerType ImagePointer = RawImage + EfeWidth*y + (x*Depth >> 3);
 188          ImagePointer[0] = b;
 189          ImagePointer[1] = g;
 190          ImagePointer[2] = r;
 191   }
 192
 193   return TRUE;
 194 }
 195
 196 bool wxPNGReader::SetPalette(wxPalette* colourmap)
 197 {
 198   if (!colourmap)
 199          return FALSE;
 200   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 201   Palette = colourmap;
 202   return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 203 }
 204
 205 bool
 206 wxPNGReader::SetPalette(int n, byte *r, byte *g, byte *b)
 207 {
 208   Palette = new wxPalette();
 209   if (!Palette)
 210          return FALSE;
 211
 212   if (!g) g = r;
 213   if (!b) b = g;
 214   Palette->Create(n, r, g, b);
 215   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 216   return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 217 }
 218
 219 bool
 220 wxPNGReader::SetPalette(int n, rgb_color_struct *rgb_struct)
 221 {
 222   Palette = new wxPalette();
 223   if (!Palette)
 224          return FALSE;
 225
 226   byte r[256], g[256], b[256];
 227
 228   for(int i=0; i<n; i++)
 229   {
 230          r[i] = rgb_struct[i].red;
 231          g[i] = rgb_struct[i].green;
 232          b[i] = rgb_struct[i].blue;
 233   }
 234   // Added by JACS copying from Andrew Davison's additions
 235   // to GIF-reading code
 236   // Make transparency colour black...
 237   if (bgindex != -1)
 238     r[bgindex] = g[bgindex] = b[bgindex] = 0;
 239
 240   Palette->Create(n, r, g, b);
 241   ColorType |= (COLORTYPE_PALETTE | COLORTYPE_COLOR);
 242   return (DibSetUsage(lpbi, (HPALETTE) Palette->GetHPALETTE(), WXIMA_COLORS ) != 0);
 243 }
 244
 245 void wxPNGReader::NullData()
 246 {
 247   lpbi = NULL;
 248   Palette = NULL;
 249 }
 250
 251 wxBitmap* wxPNGReader::GetBitmap(void)
 252 {
 253     wxBitmap *bitmap = new wxBitmap;
 254     if ( InstantiateBitmap(bitmap) )
 255         return bitmap;
 256     else
 257     {
 258         delete bitmap;
 259         return NULL;
 260     }
 261 }
 262
 263 bool wxPNGReader::InstantiateBitmap(wxBitmap *bitmap)
 264 {
 265         HDC dc = ::CreateCompatibleDC(NULL);
 266
 267         if (dc)
 268         {
 269         // tmpBitmap is a dummy, to satisfy ::CreateCompatibleDC (it
 270         // is a memory dc that must have a bitmap selected into it)
 271         HDC dc2 = GetDC(NULL);
 272         HBITMAP tmpBitmap = ::CreateCompatibleBitmap(dc2, GetWidth(), GetHeight());
 273         ReleaseDC(NULL, dc2);
 274         HBITMAP oldBitmap = ::SelectObject(dc, tmpBitmap);
 275
 276         if ( Palette )
 277         {
 278             HPALETTE oldPal = ::SelectPalette(dc, (HPALETTE) Palette->GetHPALETTE(), FALSE);
 279                     ::RealizePalette(dc);
 280         }
 281
 282                 HBITMAP hBitmap = ::CreateDIBitmap(dc, lpbi,
 283                     CBM_INIT, RawImage, (LPBITMAPINFO) lpbi, DIB_PAL_COLORS);
 284
 285         ::SelectPalette(dc, NULL, TRUE);
 286         ::SelectObject(dc, oldBitmap);
 287         ::DeleteObject(tmpBitmap);
 288         ::DeleteDC(dc);
 289
 290         if ( hBitmap )
 291         {
 292           bitmap->SetHBITMAP((WXHBITMAP) hBitmap);
 293           bitmap->SetWidth(GetWidth());
 294           bitmap->SetHeight(GetHeight());
 295           bitmap->SetDepth(GetDepth());
 296           if ( GetDepth() > 1 && Palette )
 297             bitmap->SetPalette(*Palette);
 298           bitmap->SetOk(TRUE);
 299
 300
 301           // Make a mask if appropriate
 302           if ( bgindex > -1 )
 303           {
 304             wxMask *mask = CreateMask();
 305             bitmap->SetMask(mask);
 306           }
 307                   return TRUE;
 308         }
 309         else
 310         {
 311           return FALSE;
 312         }
 313         }
 314         else
 315     {
 316                 return FALSE;
 317     }
 318 }
 319
 320 wxPalette *wxCopyPalette(const wxPalette *cmap)
 321 {
 322   // To get number of entries...
 323   WORD count = 0;
 324   ::GetObject((HPALETTE) cmap->GetHPALETTE(), sizeof(WORD), &count);
 325
 326   LOGPALETTE* logPal = (LOGPALETTE*)
 327                  new BYTE[sizeof(LOGPALETTE) + count*sizeof(PALETTEENTRY)];
 328   logPal->palVersion = 0x300;
 329   logPal->palNumEntries = count;
 330   ::GetPaletteEntries((HPALETTE) cmap->GetHPALETTE(), 0, count, logPal->palPalEntry);
 331
 332   HPALETTE hPalette = ::CreatePalette(logPal);
 333   delete[] logPal;
 334
 335   wxPalette *newCmap = new wxPalette;
 336   newCmap->SetHPALETTE((WXHPALETTE) hPalette);
 337   return newCmap;
 338 }
 339
 340 wxMask *wxPNGReader::CreateMask(void)
 341 {
 342     HBITMAP hBitmap = ::CreateBitmap(GetWidth(), GetHeight(), 1, 1, NULL);
 343
 344         HDC dc = ::CreateCompatibleDC(NULL);
 345     HBITMAP oldBitmap = ::SelectObject(dc, hBitmap);
 346
 347     int bgIndex = GetBGIndex();
 348
 349     int x,y;
 350
 351     for (x=0; x<GetWidth(); x++)
 352     {
 353         for (y=0; y<GetHeight(); y++)
 354         {
 355             int index = GetIndex(x, y);
 356             if ( index == bgIndex )
 357                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(0, 0, 0));
 358             else
 359                 ::SetPixel(dc, x, GetHeight() - y - 1, RGB(255, 255, 255));
 360
 361             }
 362     }
 363     ::SelectObject(dc, oldBitmap);
 364     wxMask *mask = new wxMask;
 365     mask->SetMaskBitmap((WXHBITMAP) hBitmap);
 366     return mask;
 367 }
 368
 369 bool wxPNGReader::ReadFile(char * ImageFileName)
 370 {
 371   int number_passes;
 372
 373   if (ImageFileName)
 374          strcpy(filename, ImageFileName);
 375
 376         FILE *fp;
 377         png_struct *png_ptr;
 378    png_info *info_ptr;
 379         wxPNGReaderIter iter(this);
 380
 381         /* open the file */
 382         fp = fopen(filename, "rb");
 383         if (!fp)
 384                 return FALSE;
 385
 386         /* allocate the necessary structures */
 387         png_ptr = new (png_struct);
 388         if (!png_ptr)
 389         {
 390                 fclose(fp);
 391                 return FALSE;
 392         }
 393
 394         info_ptr = new (png_info);
 395         if (!info_ptr)
 396         {
 397                 fclose(fp);
 398                 delete(png_ptr);
 399                 return FALSE;
 400         }
 401         /* set error handling */
 402         if (setjmp(png_ptr->jmpbuf))
 403         {
 404                 png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 405                 fclose(fp);
 406                 delete(png_ptr);
 407                 delete(info_ptr);
 408
 409                 /* If we get here, we had a problem reading the file */
 410                 return FALSE;
 411         }
 412         //png_set_error(ima_png_error, NULL);
 413
 414         /* initialize the structures, info first for error handling */
 415         png_info_init(info_ptr);
 416         png_read_init(png_ptr);
 417
 418         /* set up the input control */
 419         png_init_io(png_ptr, fp);
 420
 421         /* read the file information */
 422         png_read_info(png_ptr, info_ptr);
 423
 424         /* allocate the memory to hold the image using the fields
 425                 of png_info. */
 426         png_color_16 my_background={ 0, 31, 127, 255, 0 };
 427
 428         if (info_ptr->valid & PNG_INFO_bKGD)
 429     {
 430                 png_set_background(png_ptr, &(info_ptr->background),
 431                         PNG_BACKGROUND_GAMMA_FILE, 1, 1.0);
 432         if ( info_ptr->num_palette > 0 )
 433             bgindex = info_ptr->background.index;
 434     }
 435         else   {
 436                 png_set_background(png_ptr, &my_background,
 437                         PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
 438
 439         // Added by JACS: guesswork!
 440         if ( info_ptr->num_trans != 0 )
 441             bgindex = info_ptr->num_trans - 1 ;
 442          }
 443
 444         /* tell libpng to strip 16 bit depth files down to 8 bits */
 445         if (info_ptr->bit_depth == 16)
 446                 png_set_strip_16(png_ptr);
 447
 448         int pixel_depth=(info_ptr->pixel_depth<24) ? info_ptr->pixel_depth: 24;
 449         Create(info_ptr->width, info_ptr->height, pixel_depth,
 450                 info_ptr->color_type);
 451
 452         if (info_ptr->num_palette>0)
 453     {
 454             SetPalette((int)info_ptr->num_palette, (rgb_color_struct*)info_ptr->palette);
 455     }
 456
 457         int row_stride = info_ptr->width * ((pixel_depth+7)>>3);
 458  //     printf("P = %d D = %d RS= %d ", info_ptr->num_palette, info_ptr->pixel_depth,row_stride);
 459 //      printf("CT = %d TRS = %d BD= %d ", info_ptr->color_type, info_ptr->valid & PNG_INFO_tRNS,info_ptr->bit_depth);
 460
 461         byte *row_pointers = new byte[row_stride];
 462
 463         /* turn on interlace handling */
 464         if (info_ptr->interlace_type)
 465                 number_passes = png_set_interlace_handling(png_ptr);
 466         else
 467                 number_passes = 1;
 468 //      printf("NP = %d ", number_passes);
 469
 470         for (int pass=0; pass< number_passes; pass++) {
 471         iter.upset();
 472         int y=0;
 473         do      {
 474 //        (unsigned char *)iter.GetRow();
 475           if (info_ptr->interlace_type)  {
 476                  if (pass>0)
 477                         iter.GetRow(row_pointers, row_stride);
 478                  png_read_row(png_ptr, row_pointers, NULL);
 479           }
 480           else
 481                  png_read_row(png_ptr, row_pointers, NULL);
 482
 483           iter.SetRow(row_pointers, row_stride);
 484           y++;
 485         } while(iter.PrevRow());
 486 //      printf("Y=%d ",y);
 487         }
 488         delete[] row_pointers;
 489
 490         /* read the rest of the file, getting any additional chunks
 491                 in info_ptr */
 492         png_read_end(png_ptr, info_ptr);
 493
 494         /* clean up after the read, and free any memory allocated */
 495         png_read_destroy(png_ptr, info_ptr, (png_info *)0);
 496
 497         /* free the structures */
 498         delete(png_ptr);
 499         delete(info_ptr);
 500
 501         /* close the file */
 502         fclose(fp);
 503
 504         /* that's it */
 505         return TRUE;
 506 }
 507
 508
 509 /* write a png file */
 510
 511 bool wxPNGReader::SaveFile(char * ImageFileName)
 512 {
 513   if (ImageFileName)
 514          strcpy(filename, ImageFileName);
 515
 516   wxPNGReaderIter iter(this);
 517   FILE *fp;
 518    png_struct *png_ptr;
 519         png_info *info_ptr;
 520
 521    /* open the file */
 522         fp = fopen(filename, "wb");
 523         if (!fp)
 524                 return FALSE;
 525
 526         /* allocate the necessary structures */
 527         png_ptr = new (png_struct);
 528         if (!png_ptr)
 529         {
 530                 fclose(fp);
 531                 return FALSE;
 532         }
 533
 534         info_ptr = new (png_info);
 535         if (!info_ptr)
 536         {
 537                 fclose(fp);
 538                 delete(png_ptr);
 539                 return FALSE;
 540         }
 541
 542         /* set error handling */
 543         if (setjmp(png_ptr->jmpbuf))
 544         {
 545                 png_write_destroy(png_ptr);
 546                 fclose(fp);
 547                 delete(png_ptr);
 548                 delete(info_ptr);
 549
 550                 /* If we get here, we had a problem reading the file */
 551                 return FALSE;
 552         }
 553         //png_set_error(ima_png_error, NULL);
 554
 555 //      printf("writig pg %s ", filename);
 556    /* initialize the structures */
 557         png_info_init(info_ptr);
 558         png_write_init(png_ptr);
 559
 560         int row_stride = GetWidth() * ((GetDepth()+7)>>3);
 561         /* set up the output control */
 562    png_init_io(png_ptr, fp);
 563
 564         /* set the file information here */
 565         info_ptr->width = GetWidth();
 566         info_ptr->height = GetHeight();
 567         info_ptr->pixel_depth = GetDepth();
 568         info_ptr->channels = (GetDepth()>8) ? 3: 1;
 569         info_ptr->bit_depth = GetDepth()/info_ptr->channels;
 570         info_ptr->color_type = GetColorType();
 571         info_ptr->compression_type = info_ptr->filter_type = info_ptr->interlace_type=0;
 572         info_ptr->valid = 0;
 573         info_ptr->rowbytes = row_stride;
 574
 575
 576 // 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);
 577         /* set the palette if there is one */
 578         if ((GetColorType() & COLORTYPE_PALETTE) && GetPalette())
 579         {
 580 //        printf("writing paleta[%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 581           info_ptr->valid |= PNG_INFO_PLTE;
 582           info_ptr->palette = new png_color[256];
 583           info_ptr->num_palette = 256;
 584           for (int i=0; i<256; i++)
 585                  GetPalette()->GetRGB(i, &info_ptr->palette[i].red, &info_ptr->palette[i].green, &info_ptr->palette[i].blue);
 586         }
 587 //        printf("Paleta [%d %d %x]",GetColorType() ,COLORTYPE_PALETTE, GetPalette());
 588
 589
 590    /* optional significant bit chunk */
 591 //   info_ptr->valid |= PNG_INFO_sBIT;
 592 //   info_ptr->sig_bit = true_bit_depth;
 593
 594         /* optional gamma chunk */
 595 //   info_ptr->valid |= PNG_INFO_gAMA;
 596 //   info_ptr->gamma = gamma;
 597
 598         /* other optional chunks */
 599
 600    /* write the file information */
 601    png_write_info(png_ptr, info_ptr);
 602
 603    /* set up the transformations you want.  Note that these are
 604       all optional.  Only call them if you want them */
 605
 606         /* shift the pixels up to a legal bit depth and fill in
 607       as appropriate to correctly scale the image */
 608 //   png_set_shift(png_ptr, &(info_ptr->sig_bit));
 609
 610         /* pack pixels into bytes */
 611 //   png_set_packing(png_ptr);
 612
 613         /* flip bgr pixels to rgb */
 614 //   png_set_bgr(png_ptr);
 615
 616    /* swap bytes of 16 bit files to most significant bit first */
 617 //   png_set_swap(png_ptr);
 618
 619    /* get rid of filler bytes, pack rgb into 3 bytes */
 620 //   png_set_rgbx(png_ptr);
 621
 622 /* If you are only writing one row at a time, this works */
 623
 624         byte *row_pointers = new byte[row_stride];
 625         iter.upset();
 626         do      {
 627 //        (unsigned char *)iter.GetRow();
 628           iter.GetRow(row_pointers, row_stride);
 629           png_write_row(png_ptr, row_pointers);
 630         } while(iter.PrevRow());
 631
 632         delete[] row_pointers;
 633
 634 /* write the rest of the file */
 635    png_write_end(png_ptr, info_ptr);
 636
 637         /* clean up after the write, and free any memory allocated */
 638    png_write_destroy(png_ptr);
 639
 640    /* if you malloced the palette, free it here */
 641    if (info_ptr->palette)
 642                 delete[] (info_ptr->palette);
 643
 644         /* free the structures */
 645         delete(png_ptr);
 646         delete(info_ptr);
 647
 648         /* close the file */
 649         fclose(fp);
 650
 651         /* that's it */
 652         return TRUE;
 653 }
 654
 655 static int Power(int x, int y)
 656 {
 657     int z = 1;
 658     int i;
 659     for ( i = 0; i < y; i++)
 660     {
 661         z *= x;
 662     }
 663     return z;
 664 }
 665
 666 static char hexArray[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B',
 667   'C', 'D', 'E', 'F' };
 668
 669 static void DecToHex(int dec, char *buf)
 670 {
 671   int firstDigit = (int)(dec/16.0);
 672   int secondDigit = (int)(dec - (firstDigit*16.0));
 673   buf[0] = hexArray[firstDigit];
 674   buf[1] = hexArray[secondDigit];
 675   buf[2] = 0;
 676 }
 677
 678
 679 bool wxPNGReader::SaveXPM(char *filename, char *name)
 680 {
 681     char nameStr[256];
 682     if ( name )
 683         strcpy(nameStr, name);
 684     else
 685     {
 686         strcpy(nameStr, filename);
 687         wxStripExtension(nameStr);
 688     }
 689
 690     if ( GetDepth() > 4 )
 691     {
 692         // Only a depth of 4 and below allowed
 693         return FALSE;
 694     }
 695
 696     if ( !GetPalette() )
 697         return FALSE;
 698
 699     ofstream str(filename);
 700     if ( str.bad() )
 701         return FALSE;
 702
 703     int noColours = Power(2, GetDepth());
 704
 705     // Output header
 706     str << "/* XPM */\n";
 707     str << "static char * " << nameStr << "_xpm[] = {\n";
 708     str << "\"" << GetWidth() << " " << GetHeight() << " " << noColours << " 1\",\n";
 709
 710     // Output colourmap
 711     int base = 97 ; // start from 'a'
 712
 713     unsigned char red, green, blue;
 714     char hexBuf[4];
 715     int i;
 716     for ( i = 0; i < noColours; i ++)
 717     {
 718         str << "\"" << (char)(base + i) << "      c #";
 719         GetPalette()->GetRGB(i, &red, &green, &blue);
 720         DecToHex(red, hexBuf);
 721         str << hexBuf;
 722         DecToHex(green, hexBuf);
 723         str << hexBuf;
 724         DecToHex(blue, hexBuf);
 725         str << hexBuf;
 726         str << "\",\n";
 727     }
 728
 729     // Output the data
 730     int x, y;
 731     for ( y = 0; y < GetHeight(); y++)
 732     {
 733         str << "\"";
 734         for ( x = 0; x < GetWidth(); x++)
 735         {
 736             int index = GetIndex(x, y);
 737             str << (char)(base + index) ;
 738         }
 739         str << "\",\n";
 740     }
 741
 742     str << "};\n";
 743     str.flush();
 744
 745     return TRUE;
 746 }
 747
 748 #include <wx/msw/pnghand.h>
 749
 750 IMPLEMENT_DYNAMIC_CLASS(wxPNGFileHandler, wxBitmapHandler)
 751
 752 bool wxPNGFileHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
 753     int desiredWidth, int desiredHeight)
 754 {
 755     wxPNGReader reader;
 756     if (reader.ReadFile((char*) (const char*) name))
 757     {
 758         return reader.InstantiateBitmap(bitmap);
 759     }
 760     else
 761         return FALSE;
 762 }
 763
 764 bool wxPNGFileHandler::SaveFile(wxBitmap *bitmap, const wxString& name, int type, const wxPalette *pal)
 765 {
 766     return FALSE;
 767 }
 768
 769