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//
// 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:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.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 <FL/Fl_SVG_Image.H>
#include <FL/fl_utf8.h>
#include <stdio.h>
#include <stdlib.h>
#include "flstring.h"
#if defined(HAVE_LIBZ)
#include <zlib.h>
#endif
//
// 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);
/**
\brief Register the image formats.
This function is provided in the fltk_images library and
registers all of the "extra" image file formats that are not part
of the core FLTK library.
*/
void fl_register_images() {
Fl_Shared_Image::add_handler(fl_check_images);
Fl_Image::register_images_done = true;
}
//
// '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 headerlen) { // I - Amount of data
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] <= 0xfe) // APPn .. comment for JPEG file
return new Fl_JPEG_Image(name);
#endif // HAVE_LIBJPEG
#ifdef FLTK_USE_SVG
# if defined(HAVE_LIBZ)
if (header[0] == 0x1f && header[1] == 0x8b) { // denotes gzip'ed data
int fd = fl_open_ext(name, 1, 0);
if (fd < 0) return NULL;
gzFile gzf = gzdopen(fd, "r");
if (gzf) {
gzread(gzf, header, headerlen);
gzclose(gzf);
}
}
# endif // HAVE_LIBZ
if ( (headerlen > 5 && memcmp(header, "<?xml", 5) == 0) ||
memcmp(header, "<svg", 4) == 0)
return new Fl_SVG_Image(name);
#endif // FLTK_USE_SVG
return 0;
}
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