src/fl_images_core.cxx

   1 //
   2 // "$Id: fl_images_core.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // FLTK images library core.
   5 //
   6 // Copyright 1997-2010 by Easy Software Products.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27 // Contents:
  28 //
  29 //   fl_register_images() - Register the image formats.
  30 //   fl_check_images()    - Check for a supported image format.
  31 //
  32
  33 //
  34 // Include necessary header files...
  35 //
  36
  37 #include <FL/Fl_Shared_Image.H>
  38 #include <FL/Fl_BMP_Image.H>
  39 #include <FL/Fl_GIF_Image.H>
  40 #include <FL/Fl_JPEG_Image.H>
  41 #include <FL/Fl_PNG_Image.H>
  42 #include <FL/Fl_PNM_Image.H>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include "flstring.h"
  46
  47
  48 //
  49 // Define a simple global image registration function that registers
  50 // the extra image formats that aren't part of the core FLTK library.
  51 //
  52
  53 static Fl_Image *fl_check_images(const char *name, uchar *header, int headerlen);
  54
  55
  56 /**
  57 \brief Register the image formats.
  58  *
  59  This function is provided in the fltk_images library and
  60  registers all of the "extra" image file formats that are not part
  61  of the core FLTK library.
  62 */
  63 void fl_register_images() {
  64   Fl_Shared_Image::add_handler(fl_check_images);
  65 }
  66
  67
  68 //
  69 // 'fl_check_images()' - Check for a supported image format.
  70 //
  71
  72 Fl_Image *                                      // O - Image, if found
  73 fl_check_images(const char *name,               // I - Filename
  74                 uchar      *header,             // I - Header data from file
  75                 int) {                          // I - Amount of data (not used)
  76   if (memcmp(header, "GIF87a", 6) == 0 ||
  77       memcmp(header, "GIF89a", 6) == 0) // GIF file
  78     return new Fl_GIF_Image(name);
  79
  80   if (memcmp(header, "BM", 2) == 0)     // BMP file
  81     return new Fl_BMP_Image(name);
  82
  83   if (header[0] == 'P' && header[1] >= '1' && header[1] <= '7')
  84                                         // Portable anymap
  85     return new Fl_PNM_Image(name);
  86
  87 #ifdef HAVE_LIBPNG
  88   if (memcmp(header, "\211PNG", 4) == 0)// PNG file
  89     return new Fl_PNG_Image(name);
  90 #endif // HAVE_LIBPNG
  91
  92 #ifdef HAVE_LIBJPEG
  93   if (memcmp(header, "\377\330\377", 3) == 0 &&
  94                                         // Start-of-Image
  95       header[3] >= 0xc0 && header[3] <= 0xef)
  96                                         // APPn for JPEG file
  97     return new Fl_JPEG_Image(name);
  98 #endif // HAVE_LIBJPEG
  99
 100   return 0;
 101 }
 102
 103
 104 //
 105 // End of "$Id: fl_images_core.cxx 7903 2010-11-28 21:06:39Z matt $".
 106 //