fl_images_core.cxx

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//
// "$Id$"
//
// FLTK images library core.
//
// Copyright 1997-2010 by Easy Software Products.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//
// Contents:
//
//   fl_register_images() - Register the image formats.
//   fl_check_images()    - Check for a supported image format.
//
 
//
// Include necessary header files...
//
 
#include <FL/Fl_Shared_Image.H>
#include <FL/Fl_BMP_Image.H>
#include <FL/Fl_GIF_Image.H>
#include <FL/Fl_JPEG_Image.H>
#include <FL/Fl_PNG_Image.H>
#include <FL/Fl_PNM_Image.H>
#include <stdio.h>
#include <stdlib.h>
#include "flstring.h"
 
 
//
// Define a simple global image registration function that registers
// the extra image formats that aren't part of the core FLTK library.
//
 
static Fl_Image *fl_check_images(const char *name, uchar *header, int headerlen);
 
 
void fl_register_images() {
  Fl_Shared_Image::add_handler(fl_check_images);
}
 
 
//
// 'fl_check_images()' - Check for a supported image format.
//
 
Fl_Image *                  // O - Image, if found
fl_check_images(const char *name,       // I - Filename
                uchar      *header,     // I - Header data from file
        int) {              // I - Amount of data (not used)
  if (memcmp(header, "GIF87a", 6) == 0 ||
      memcmp(header, "GIF89a", 6) == 0) // GIF file
    return new Fl_GIF_Image(name);
 
  if (memcmp(header, "BM", 2) == 0) // BMP file
    return new Fl_BMP_Image(name);
 
  if (header[0] == 'P' && header[1] >= '1' && header[1] <= '7')
                    // Portable anymap
    return new Fl_PNM_Image(name);
 
#ifdef HAVE_LIBPNG
  if (memcmp(header, "\211PNG", 4) == 0)// PNG file
    return new Fl_PNG_Image(name);
#endif // HAVE_LIBPNG
 
#ifdef HAVE_LIBJPEG
  if (memcmp(header, "\377\330\377", 3) == 0 &&
                    // Start-of-Image
      header[3] >= 0xc0 && header[3] <= 0xef)
                    // APPn for JPEG file
    return new Fl_JPEG_Image(name);
#endif // HAVE_LIBJPEG
 
  return 0;
}
 
 
//
// End of "$Id$".
//