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599 lines
16 KiB
C
599 lines
16 KiB
C
/* GdkPixbuf library - Main loading interface.
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*
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* Copyright (C) 1999 The Free Software Foundation
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*
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* Authors: Miguel de Icaza <miguel@gnu.org>
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* Federico Mena-Quintero <federico@gimp.org>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <config.h>
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#include <string.h>
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#include <glib.h>
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#include "gdk-pixbuf-private.h"
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#include "gdk-pixbuf-io.h"
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#ifdef G_OS_WIN32
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#define STRICT
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#include <windows.h>
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#endif
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static gboolean
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pixbuf_check_png (guchar *buffer, int size)
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{
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if (size < 28)
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return FALSE;
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if (buffer [0] != 0x89 ||
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buffer [1] != 'P' ||
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buffer [2] != 'N' ||
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buffer [3] != 'G' ||
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buffer [4] != 0x0d ||
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buffer [5] != 0x0a ||
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buffer [6] != 0x1a ||
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buffer [7] != 0x0a)
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_jpeg (guchar *buffer, int size)
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{
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if (size < 10)
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return FALSE;
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if (buffer [0] != 0xff || buffer [1] != 0xd8)
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_tiff (guchar *buffer, int size)
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{
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if (size < 10)
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return FALSE;
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if (buffer [0] == 'M' &&
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buffer [1] == 'M' &&
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buffer [2] == 0 &&
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buffer [3] == 0x2a)
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return TRUE;
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if (buffer [0] == 'I' &&
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buffer [1] == 'I' &&
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buffer [2] == 0x2a &&
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buffer [3] == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_gif (guchar *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (strncmp (buffer, "GIF8", 4) == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_xpm (guchar *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (strncmp (buffer, "/* XPM */", 9) == 0)
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return TRUE;
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return FALSE;
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}
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static gboolean
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pixbuf_check_pnm (guchar *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (buffer [0] == 'P') {
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if (buffer [1] == '1' ||
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buffer [1] == '2' ||
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buffer [1] == '3' ||
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buffer [1] == '4' ||
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buffer [1] == '5' ||
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buffer [1] == '6')
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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pixbuf_check_sunras (guchar *buffer, int size)
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{
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if (size < 32)
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return FALSE;
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if (buffer [0] != 0x59 ||
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buffer [1] != 0xA6 ||
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buffer [2] != 0x6A ||
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buffer [3] != 0x95)
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_ico (guchar *buffer, int size)
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{
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/* Note that this may cause false positives, but .ico's don't
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have a magic number.*/
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if (size < 6)
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return FALSE;
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if (buffer [0] != 0x0 ||
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buffer [1] != 0x0 ||
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((buffer [2] != 0x1)&&(buffer[2]!=0x2)) ||
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buffer [3] != 0x0 ||
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buffer [5] != 0x0 )
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_bmp (guchar *buffer, int size)
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{
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if (size < 20)
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return FALSE;
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if (buffer [0] != 'B' || buffer [1] != 'M')
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return FALSE;
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return TRUE;
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}
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static gboolean
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pixbuf_check_wbmp (guchar *buffer, int size)
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{
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if(size < 10) /* at least */
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return FALSE;
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if(buffer[0] == '\0' /* We only handle type 0 wbmp's for now */)
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return TRUE;
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return FALSE;
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}
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static GdkPixbufModule file_formats [] = {
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{ "png", pixbuf_check_png, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "jpeg", pixbuf_check_jpeg, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "tiff", pixbuf_check_tiff, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "gif", pixbuf_check_gif, NULL, NULL, NULL, NULL, NULL, NULL },
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#define XPM_FILE_FORMAT_INDEX 4
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{ "xpm", pixbuf_check_xpm, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "pnm", pixbuf_check_pnm, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "ras", pixbuf_check_sunras, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "ico", pixbuf_check_ico, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "bmp", pixbuf_check_bmp, NULL, NULL, NULL, NULL, NULL, NULL },
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{ "wbmp", pixbuf_check_wbmp, NULL, NULL, NULL, NULL, NULL, NULL },
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{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
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};
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#ifdef USE_GMODULE
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static gboolean
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pixbuf_module_symbol (GModule *module, const char *module_name, const char *symbol_name, gpointer *symbol)
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{
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char *full_symbol_name = g_strconcat ("gdk_pixbuf__", module_name, "_", symbol_name, NULL);
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gboolean return_value;
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return_value = g_module_symbol (module, full_symbol_name, symbol);
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g_free (full_symbol_name);
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return return_value;
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}
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#ifdef G_OS_WIN32
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/* What would be the right place for this function? Also
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* gtk needs this function (to find the gtkrc and themes).
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* But it seems stupid for the gdk-pixbuf DLL to depend
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* on the gtk DLL. Should it be in the gdk DLL? Or should we
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* have a small static library at the top gtk+ level?
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*/
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static gchar *
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gtk_win32_get_installation_directory (void)
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{
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static gboolean been_here = FALSE;
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static gchar gtk_installation_dir[200];
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gchar win_dir[100];
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HKEY reg_key = NULL;
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DWORD type;
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DWORD nbytes = sizeof (gtk_installation_dir);
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if (been_here)
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return gtk_installation_dir;
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been_here = TRUE;
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if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, "Software\\GNU\\GTk+", 0,
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KEY_QUERY_VALUE, ®_key) != ERROR_SUCCESS
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|| RegQueryValueEx (reg_key, "InstallationDirectory", 0,
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&type, gtk_installation_dir, &nbytes) != ERROR_SUCCESS
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|| type != REG_SZ)
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{
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/* Uh oh. Use hard-coded %WinDir%\gtk+ value */
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GetWindowsDirectory (win_dir, sizeof (win_dir));
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sprintf (gtk_installation_dir, "%s\\gtk+", win_dir);
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}
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if (reg_key != NULL)
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RegCloseKey (reg_key);
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return gtk_installation_dir;
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}
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static char *
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get_libdir (void)
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{
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static char *libdir = NULL;
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if (libdir == NULL)
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libdir = g_strdup_printf (gtk_win32_get_installation_directory (),
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G_DIR_SEPARATOR_S,
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"loaders",
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NULL);
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return libdir;
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}
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#define PIXBUF_LIBDIR get_libdir ()
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#endif
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/* actually load the image handler - gdk_pixbuf_get_module only get a */
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/* reference to the module to load, it doesn't actually load it */
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/* perhaps these actions should be combined in one function */
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void
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gdk_pixbuf_load_module (GdkPixbufModule *image_module)
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{
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char *module_name;
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char *path;
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GModule *module;
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gpointer load_sym;
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char *name;
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g_return_if_fail (image_module->module == NULL);
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name = image_module->module_name;
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module_name = g_strconcat ("pixbufloader-", name, NULL);
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path = g_module_build_path (PIXBUF_LIBDIR, module_name);
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module = g_module_open (path, G_MODULE_BIND_LAZY);
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if (!module) {
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/* Debug feature, check in GDK_PIXBUF_MODULEDIR, or working directory */
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char *dir = g_getenv ("GDK_PIXBUF_MODULEDIR");
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if (!dir)
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dir = "";
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g_free (path);
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path = g_module_build_path (dir, module_name);
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module = g_module_open (path, G_MODULE_BIND_LAZY);
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if (!module) {
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g_warning ("Unable to load module: %s: %s", path, g_module_error ());
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g_free (module_name);
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g_free (path);
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return;
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}
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g_free (path);
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} else {
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g_free (path);
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}
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g_free (module_name);
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image_module->module = module;
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if (pixbuf_module_symbol (module, name, "image_load", &load_sym))
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image_module->load = load_sym;
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if (pixbuf_module_symbol (module, name, "image_load_xpm_data", &load_sym))
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image_module->load_xpm_data = load_sym;
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if (pixbuf_module_symbol (module, name, "image_begin_load", &load_sym))
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image_module->begin_load = load_sym;
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if (pixbuf_module_symbol (module, name, "image_stop_load", &load_sym))
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image_module->stop_load = load_sym;
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if (pixbuf_module_symbol (module, name, "image_load_increment", &load_sym))
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image_module->load_increment = load_sym;
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if (pixbuf_module_symbol (module, name, "image_load_animation", &load_sym))
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image_module->load_animation = load_sym;
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}
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#else
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#define mname(type,fn) gdk_pixbuf__ ## type ## _image_ ##fn
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#define m_load(type) extern GdkPixbuf * mname(type,load) (FILE *f);
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#define m_load_xpm_data(type) extern GdkPixbuf * mname(type,load_xpm_data) (const char **data);
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#define m_begin_load(type) \
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extern gpointer mname(type,begin_load) (ModulePreparedNotifyFunc prepare_func, \
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ModuleUpdatedNotifyFunc update_func, \
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ModuleFrameDoneNotifyFunc frame_done_func,\
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ModuleAnimationDoneNotifyFunc anim_done_func,\
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gpointer user_data);
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#define m_stop_load(type) extern void mname(type,stop_load) (gpointer context);
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#define m_load_increment(type) extern gboolean mname(type,load_increment) (gpointer context, const guchar *buf, guint size);
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#define m_load_animation(type) extern GdkPixbufAnimation * mname(type,load_animation) (FILE *f);
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/* PNG */
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m_load (png);
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m_begin_load (png);
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m_load_increment (png);
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m_stop_load (png);
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/* BMP */
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m_load (bmp);
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m_begin_load (bmp);
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m_load_increment (bmp);
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m_stop_load (bmp);
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/* WBMP */
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m_load (wbmp);
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m_begin_load (wbmp);
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m_load_increment (wbmp);
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m_stop_load (wbmp);
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/* GIF */
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m_load (gif);
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m_begin_load (gif);
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m_load_increment (gif);
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m_stop_load (gif);
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m_load_animation (gif);
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/* ICO */
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m_load (ico);
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m_begin_load (ico);
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m_load_increment (ico);
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m_stop_load (ico);
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/* JPEG */
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m_load (jpeg);
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m_begin_load (jpeg);
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m_load_increment (jpeg);
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m_stop_load (jpeg);
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/* PNM */
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m_load (pnm);
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m_begin_load (pnm);
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m_load_increment (pnm);
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m_stop_load (pnm);
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/* RAS */
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m_load (ras);
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m_begin_load (ras);
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m_load_increment (ras);
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m_stop_load (ras);
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/* TIFF */
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m_load (tiff);
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m_begin_load (tiff);
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m_load_increment (tiff);
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m_stop_load (tiff);
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/* XPM */
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m_load (xpm);
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m_load_xpm_data (xpm);
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void
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gdk_pixbuf_load_module (GdkPixbufModule *image_module)
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{
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image_module->module = (void *) 1;
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if (strcmp (image_module->module_name, "png") == 0){
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image_module->load = mname (png,load);
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image_module->begin_load = mname (png,begin_load);
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image_module->load_increment = mname (png,load_increment);
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image_module->stop_load = mname (png,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "bmp") == 0){
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image_module->load = mname (bmp,load);
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image_module->begin_load = mname (bmp,begin_load);
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image_module->load_increment = mname (bmp,load_increment);
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image_module->stop_load = mname (bmp,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "wbmp") == 0){
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image_module->load = mname (wbmp,load);
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image_module->begin_load = mname (wbmp,begin_load);
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image_module->load_increment = mname (wbmp,load_increment);
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image_module->stop_load = mname (wbmp,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "gif") == 0){
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image_module->load = mname (gif,load);
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image_module->begin_load = mname (gif,begin_load);
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image_module->load_increment = mname (gif,load_increment);
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image_module->stop_load = mname (gif,stop_load);
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image_module->load_animation = mname (gif,load_animation);
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return;
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}
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if (strcmp (image_module->module_name, "ico") == 0){
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image_module->load = mname (ico,load);
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image_module->begin_load = mname (ico,begin_load);
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image_module->load_increment = mname (ico,load_increment);
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image_module->stop_load = mname (ico,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "jpeg") == 0){
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image_module->load = mname (jpeg,load);
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image_module->begin_load = mname (jpeg,begin_load);
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image_module->load_increment = mname (jpeg,load_increment);
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image_module->stop_load = mname (jpeg,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "pnm") == 0){
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image_module->load = mname (pnm,load);
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image_module->begin_load = mname (pnm,begin_load);
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image_module->load_increment = mname (pnm,load_increment);
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image_module->stop_load = mname (pnm,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "ras") == 0){
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image_module->load = mname (ras,load);
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image_module->begin_load = mname (ras,begin_load);
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image_module->load_increment = mname (ras,load_increment);
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image_module->stop_load = mname (ras,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "tiff") == 0){
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image_module->load = mname (tiff,load);
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image_module->begin_load = mname (tiff,begin_load);
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image_module->load_increment = mname (tiff,load_increment);
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image_module->stop_load = mname (tiff,stop_load);
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return;
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}
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if (strcmp (image_module->module_name, "xpm") == 0){
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image_module->load = mname (xpm,load);
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image_module->load_xpm_data = mname (xpm,load_xpm_data);
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return;
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}
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}
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#endif
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GdkPixbufModule *
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gdk_pixbuf_get_named_module (const char *name)
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{
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int i;
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for (i = 0; file_formats [i].module_name; i++) {
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if (!strcmp(name, file_formats[i].module_name))
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return &(file_formats[i]);
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}
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return NULL;
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}
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GdkPixbufModule *
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gdk_pixbuf_get_module (guchar *buffer, guint size)
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{
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int i;
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for (i = 0; file_formats [i].module_name; i++) {
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if ((* file_formats [i].format_check) (buffer, size))
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return &(file_formats[i]);
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}
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return NULL;
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}
|
||
|
||
/**
|
||
* gdk_pixbuf_new_from_file:
|
||
* @filename: Name of file to load.
|
||
*
|
||
* Creates a new pixbuf by loading an image from a file. The file format is
|
||
* detected automatically.
|
||
*
|
||
* Return value: A newly-created pixbuf with a reference count of 1, or NULL if
|
||
* any of several error conditions occurred: the file could not be opened,
|
||
* there was no loader for the file's format, there was not enough memory to
|
||
* allocate the image buffer, or the image file contained invalid data.
|
||
**/
|
||
GdkPixbuf *
|
||
gdk_pixbuf_new_from_file (const char *filename)
|
||
{
|
||
GdkPixbuf *pixbuf;
|
||
int size;
|
||
FILE *f;
|
||
guchar buffer [128];
|
||
GdkPixbufModule *image_module;
|
||
|
||
g_return_val_if_fail (filename != NULL, NULL);
|
||
|
||
f = fopen (filename, "rb");
|
||
if (!f)
|
||
return NULL;
|
||
|
||
size = fread (&buffer, 1, sizeof (buffer), f);
|
||
if (size == 0) {
|
||
fclose (f);
|
||
return NULL;
|
||
}
|
||
|
||
image_module = gdk_pixbuf_get_module (buffer, size);
|
||
if (!image_module) {
|
||
g_warning ("Unable to find handler for file: %s", filename);
|
||
fclose (f);
|
||
return NULL;
|
||
}
|
||
|
||
if (image_module->module == NULL)
|
||
gdk_pixbuf_load_module (image_module);
|
||
|
||
if (image_module->load == NULL) {
|
||
fclose (f);
|
||
return NULL;
|
||
}
|
||
|
||
fseek (f, 0, SEEK_SET);
|
||
pixbuf = (* image_module->load) (f);
|
||
fclose (f);
|
||
|
||
return pixbuf;
|
||
}
|
||
|
||
/**
|
||
* gdk_pixbuf_new_from_xpm_data:
|
||
* @data: Pointer to inline XPM data.
|
||
*
|
||
* Creates a new pixbuf by parsing XPM data in memory. This data is commonly
|
||
* the result of including an XPM file into a program's C source.
|
||
*
|
||
* Return value: A newly-created pixbuf with a reference count of 1.
|
||
**/
|
||
GdkPixbuf *
|
||
gdk_pixbuf_new_from_xpm_data (const char **data)
|
||
{
|
||
GdkPixbuf *(* load_xpm_data) (const char **data);
|
||
GdkPixbuf *pixbuf;
|
||
|
||
if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL)
|
||
gdk_pixbuf_load_module (&file_formats[XPM_FILE_FORMAT_INDEX]);
|
||
|
||
if (file_formats[XPM_FILE_FORMAT_INDEX].module == NULL) {
|
||
g_warning ("Can't find gdk-pixbuf module for parsing inline XPM data");
|
||
return NULL;
|
||
} else if (file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data == NULL) {
|
||
g_warning ("gdk-pixbuf XPM module lacks XPM data capability");
|
||
return NULL;
|
||
} else
|
||
load_xpm_data = file_formats[XPM_FILE_FORMAT_INDEX].load_xpm_data;
|
||
|
||
pixbuf = (* load_xpm_data) (data);
|
||
return pixbuf;
|
||
}
|