src/common/imagtiff.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        imagjpeg.cpp
   3 // Purpose:     wxImage JPEG handler
   4 // Author:      Vaclav Slavik
   5 // RCS-ID:      $Id$
   6 // Copyright:   (c) Vaclav Slavik
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10 /*
  11    We don't put pragma implement in this file because it is already present in
  12    src/common/image.cpp
  13 */
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #ifdef __BORLANDC__
  19 #pragma hdrstop
  20 #endif
  21
  22 #include "wx/defs.h"
  23
  24 #if wxUSE_LIBTIFF
  25
  26 #include "wx/image.h"
  27 #include "wx/bitmap.h"
  28 #include "wx/debug.h"
  29 #include "wx/log.h"
  30 #include "wx/app.h"
  31 extern "C"
  32 {
  33     #include "tiff.h"
  34     #include "tiffio.h"
  35     #include "tiffiop.h"
  36 }
  37 #include "wx/filefn.h"
  38 #include "wx/wfstream.h"
  39 #include "wx/intl.h"
  40 #include "wx/module.h"
  41
  42 //-----------------------------------------------------------------------------
  43 // wxTIFFHandler
  44 //-----------------------------------------------------------------------------
  45
  46 #if !USE_SHARED_LIBRARIES
  47 IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
  48 #endif
  49
  50 static tsize_t
  51 _tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
  52 {
  53     wxInputStream *stream = (wxInputStream*) handle;
  54     stream->Read( (void*) buf, (size_t) size );
  55     return stream->LastRead();
  56 }
  57
  58 static tsize_t
  59 _tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
  60 {
  61     wxOutputStream *stream = (wxOutputStream*) handle;
  62     stream->Write( (void*) buf, (size_t) size );
  63     return stream->LastWrite();
  64 }
  65
  66 static toff_t
  67 _tiffSeekProc(thandle_t handle, toff_t off, int whence)
  68 {
  69     wxInputStream *stream = (wxInputStream*) handle;
  70     wxSeekMode mode;
  71     switch (whence)
  72     {
  73         case SEEK_SET: mode = wxFromStart; break;
  74         case SEEK_CUR: mode = wxFromCurrent; break;
  75         case SEEK_END: mode = wxFromEnd; break;
  76         default:       mode = wxFromCurrent; break;
  77     }
  78
  79     return (toff_t)stream->SeekI( (off_t)off, mode );
  80 }
  81
  82 static int
  83 _tiffCloseProc(thandle_t WXUNUSED(handle))
  84 {
  85     return 0;  // ?
  86 }
  87
  88 static toff_t
  89 _tiffSizeProc(thandle_t handle)
  90 {
  91     wxInputStream *stream = (wxInputStream*) handle;
  92     return (toff_t) stream->GetSize();
  93 }
  94
  95 static int
  96 _tiffMapProc(thandle_t WXUNUSED(handle), tdata_t* pbase, toff_t* psize)
  97 {
  98     return 0;
  99 }
 100
 101 static void
 102 _tiffUnmapProc(thandle_t WXUNUSED(handle), tdata_t base, toff_t size)
 103 {
 104 }
 105
 106 TIFF*
 107 TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
 108 {
 109     TIFF* tif = TIFFClientOpen(name, mode,
 110         (thandle_t) &stream,
 111         _tiffReadProc, _tiffWriteProc,
 112         _tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
 113         _tiffMapProc, _tiffUnmapProc);
 114
 115     if (tif)
 116         tif->tif_fd = (int) &stream;
 117
 118     return tif;
 119 }
 120
 121
 122 bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
 123 {
 124     image->Destroy();
 125
 126     TIFF *tif = TIFFwxOpen( stream, "image", "r" );
 127
 128     if (!tif)
 129     {
 130         if (verbose)
 131             wxLogError( _("TIFF: Error loading image.") );
 132
 133         return FALSE;
 134     }
 135
 136     if (!TIFFSetDirectory( tif, (tdir_t)index ))
 137     {
 138         if (verbose)
 139             wxLogError( _("Invalid TIFF image index.") );
 140
 141         TIFFClose( tif );
 142
 143         return FALSE;
 144     }
 145
 146     uint32 w, h;
 147     size_t npixels;
 148     uint32 *raster;
 149
 150     TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
 151     TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
 152
 153     npixels = w * h;
 154
 155     raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );
 156
 157     if (!raster)
 158     {
 159         if (verbose)
 160             wxLogError( _("TIFF: Couldn't allocate memory.") );
 161
 162         return FALSE;
 163     }
 164
 165     image->Create( w, h );
 166     if (!image->Ok())
 167     {
 168         if (verbose)
 169             wxLogError( _("TIFF: Couldn't allocate memory.") );
 170
 171         _TIFFfree( raster );
 172
 173         return FALSE;
 174     }
 175
 176     if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
 177     {
 178         if (verbose)
 179             wxLogError( _("TIFF: Error reading image.") );
 180
 181         _TIFFfree( raster );
 182         image->Destroy();
 183
 184         return FALSE;
 185     }
 186
 187     bool hasmask = FALSE;
 188
 189     unsigned char *ptr = image->GetData();
 190     uint32 pos = 0;
 191
 192     for (uint32 i = 0; i < h; i++)
 193     {
 194         for (uint32 j = 0; w < h; j++)
 195         {
 196             unsigned char alpha = (unsigned char)(raster[pos] >> 24);
 197             if (alpha < 127)
 198             {
 199                 hasmask = TRUE;
 200                 ptr[0] = image->GetMaskRed();
 201                 ptr++;
 202                 ptr[0] = image->GetMaskGreen();
 203                 ptr++;
 204                 ptr[0] = image->GetMaskBlue();
 205                 ptr++;
 206             }
 207             else
 208             {
 209                 ptr[0] = (unsigned char)(raster[pos] >> 16);
 210                 ptr++;
 211                 ptr[0] = (unsigned char)(raster[pos] >> 8);
 212                 ptr++;
 213                 ptr[0] = (unsigned char)(raster[pos]);
 214                 ptr++;
 215             }
 216             pos++;
 217         }
 218     }
 219
 220     _TIFFfree( raster );
 221
 222     TIFFClose( tif );
 223
 224     image->SetMask( hasmask );
 225
 226     return TRUE;
 227 }
 228
 229 int wxTIFFHandler::GetImageCount( wxInputStream& stream )
 230 {
 231     TIFF *tif = TIFFwxOpen( stream, "image", "r" );
 232
 233     if (!tif)
 234         return 0;
 235
 236     int dircount = 0;  // according to the libtiff docs, dircount should be set to 1 here???
 237     do {
 238         dircount++;
 239     } while (TIFFReadDirectory(tif));
 240
 241     TIFFClose( tif );
 242
 243     return dircount;
 244 }
 245
 246 bool wxTIFFHandler::SaveFile( wxImage *WXUNUSED(image), wxOutputStream& WXUNUSED(stream), bool WXUNUSED(verbose) )
 247 {
 248     return FALSE;
 249 }
 250
 251 bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
 252 {
 253     unsigned char hdr[2];
 254
 255     stream.Read(&hdr, 2);
 256     stream.SeekI(-2, wxFromCurrent);
 257
 258     return ((hdr[0] == 0x49 && hdr[1] == 0x49) ||
 259             (hdr[0] == 0x4D && hdr[1] == 0x4D));
 260 }
 261
 262
 263 #endif
 264    // wxUSE_LIBTIFF
 265
 266
 267
 268
 269
 270