mirror of
https://gitlab.gnome.org/GNOME/gtk.git
synced 2024-11-18 17:30:10 +00:00
3ddaa73578
2000-07-27 Elliot Lee <sopwith@redhat.com> * gtk/gdk-pixbuf-loader.[ch]: Add gdk_pixbuf_loader_new_with_type function, to allow handling image formats that cannot be detected by looking at content alone. gdk-pixbuf/ 2000-07-27 Elliot Lee <sopwith@redhat.com> * gdk-pixbuf-io.h, gdk-pixbuf-io.c: Add gdk_pixbuf_get_named_module() function to facilitate above change * io-bmp.c: Don't malloc a temporary buffer - use stack instead. * io-wbmp.c, pixbufloader_wbmp.defs, gdk-pixbuf-io.c, Makefile: Implement loader for WBMP format. **NOTE: I haven't tested this yet, I need to sync it to another machine, but it if it is broken I'm already working on fixing it
599 lines
16 KiB
C
599 lines
16 KiB
C
/* GdkPixbuf library - Main loading interface.
|
||
*
|
||
* Copyright (C) 1999 The Free Software Foundation
|
||
*
|
||
* Authors: Miguel de Icaza <miguel@gnu.org>
|
||
* Federico Mena-Quintero <federico@gimp.org>
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Lesser General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2 of the License, or (at your option) any later version.
|
||
*
|
||
* This library is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
* Lesser General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Lesser General Public
|
||
* License along with this library; if not, write to the
|
||
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
||
* Boston, MA 02111-1307, USA.
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <string.h>
|
||
#include <glib.h>
|
||
#include "gdk-pixbuf-private.h"
|
||
#include "gdk-pixbuf-io.h"
|
||
|
||
#ifdef G_OS_WIN32
|
||
#define STRICT
|
||
#include <windows.h>
|
||
#endif
|
||
|
||
|
||
|
||
static gboolean
|
||
pixbuf_check_png (guchar *buffer, int size)
|
||
{
|
||
if (size < 28)
|
||
return FALSE;
|
||
|
||
if (buffer [0] != 0x89 ||
|
||
buffer [1] != 'P' ||
|
||
buffer [2] != 'N' ||
|
||
buffer [3] != 'G' ||
|
||
buffer [4] != 0x0d ||
|
||
buffer [5] != 0x0a ||
|
||
buffer [6] != 0x1a ||
|
||
buffer [7] != 0x0a)
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_jpeg (guchar *buffer, int size)
|
||
{
|
||
if (size < 10)
|
||
return FALSE;
|
||
|
||
if (buffer [0] != 0xff || buffer [1] != 0xd8)
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_tiff (guchar *buffer, int size)
|
||
{
|
||
if (size < 10)
|
||
return FALSE;
|
||
|
||
if (buffer [0] == 'M' &&
|
||
buffer [1] == 'M' &&
|
||
buffer [2] == 0 &&
|
||
buffer [3] == 0x2a)
|
||
return TRUE;
|
||
|
||
if (buffer [0] == 'I' &&
|
||
buffer [1] == 'I' &&
|
||
buffer [2] == 0x2a &&
|
||
buffer [3] == 0)
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_gif (guchar *buffer, int size)
|
||
{
|
||
if (size < 20)
|
||
return FALSE;
|
||
|
||
if (strncmp (buffer, "GIF8", 4) == 0)
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_xpm (guchar *buffer, int size)
|
||
{
|
||
if (size < 20)
|
||
return FALSE;
|
||
|
||
if (strncmp (buffer, "/* XPM */", 9) == 0)
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_pnm (guchar *buffer, int size)
|
||
{
|
||
if (size < 20)
|
||
return FALSE;
|
||
|
||
if (buffer [0] == 'P') {
|
||
if (buffer [1] == '1' ||
|
||
buffer [1] == '2' ||
|
||
buffer [1] == '3' ||
|
||
buffer [1] == '4' ||
|
||
buffer [1] == '5' ||
|
||
buffer [1] == '6')
|
||
return TRUE;
|
||
}
|
||
return FALSE;
|
||
}
|
||
static gboolean
|
||
pixbuf_check_sunras (guchar *buffer, int size)
|
||
{
|
||
if (size < 32)
|
||
return FALSE;
|
||
|
||
if (buffer [0] != 0x59 ||
|
||
buffer [1] != 0xA6 ||
|
||
buffer [2] != 0x6A ||
|
||
buffer [3] != 0x95)
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_ico (guchar *buffer, int size)
|
||
{
|
||
/* Note that this may cause false positives, but .ico's don't
|
||
have a magic number.*/
|
||
if (size < 6)
|
||
return FALSE;
|
||
if (buffer [0] != 0x0 ||
|
||
buffer [1] != 0x0 ||
|
||
((buffer [2] != 0x1)&&(buffer[2]!=0x2)) ||
|
||
buffer [3] != 0x0 ||
|
||
buffer [5] != 0x0 )
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
|
||
static gboolean
|
||
pixbuf_check_bmp (guchar *buffer, int size)
|
||
{
|
||
if (size < 20)
|
||
return FALSE;
|
||
|
||
if (buffer [0] != 'B' || buffer [1] != 'M')
|
||
return FALSE;
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
pixbuf_check_wbmp (guchar *buffer, int size)
|
||
{
|
||
if(size < 10) /* at least */
|
||
return FALSE;
|
||
|
||
if(buffer[0] == '\0' /* We only handle type 0 wbmp's for now */)
|
||
return TRUE;
|
||
|
||
return FALSE;
|
||
}
|
||
|
||
static GdkPixbufModule file_formats [] = {
|
||
{ "png", pixbuf_check_png, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "jpeg", pixbuf_check_jpeg, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "tiff", pixbuf_check_tiff, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "gif", pixbuf_check_gif, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
#define XPM_FILE_FORMAT_INDEX 4
|
||
{ "xpm", pixbuf_check_xpm, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "pnm", pixbuf_check_pnm, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "ras", pixbuf_check_sunras, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "ico", pixbuf_check_ico, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "bmp", pixbuf_check_bmp, NULL, NULL, NULL, NULL, NULL, NULL },
|
||
{ "wbmp", pixbuf_check_wbmp, NULL, NULL, NULL, NULL, NULL, NULL }
|
||
{ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL }
|
||
};
|
||
|
||
#ifdef USE_GMODULE
|
||
static gboolean
|
||
pixbuf_module_symbol (GModule *module, const char *module_name, const char *symbol_name, gpointer *symbol)
|
||
{
|
||
char *full_symbol_name = g_strconcat ("gdk_pixbuf__", module_name, "_", symbol_name, NULL);
|
||
gboolean return_value;
|
||
|
||
return_value = g_module_symbol (module, full_symbol_name, symbol);
|
||
g_free (full_symbol_name);
|
||
|
||
return return_value;
|
||
}
|
||
|
||
#ifdef G_OS_WIN32
|
||
|
||
/* What would be the right place for this function? Also
|
||
* gtk needs this function (to find the gtkrc and themes).
|
||
* But it seems stupid for the gdk-pixbuf DLL to depend
|
||
* on the gtk DLL. Should it be in the gdk DLL? Or should we
|
||
* have a small static library at the top gtk+ level?
|
||
*/
|
||
|
||
static gchar *
|
||
gtk_win32_get_installation_directory (void)
|
||
{
|
||
static gboolean been_here = FALSE;
|
||
static gchar gtk_installation_dir[200];
|
||
gchar win_dir[100];
|
||
HKEY reg_key = NULL;
|
||
DWORD type;
|
||
DWORD nbytes = sizeof (gtk_installation_dir);
|
||
|
||
if (been_here)
|
||
return gtk_installation_dir;
|
||
|
||
been_here = TRUE;
|
||
|
||
if (RegOpenKeyEx (HKEY_LOCAL_MACHINE, "Software\\GNU\\GTk+", 0,
|
||
KEY_QUERY_VALUE, ®_key) != ERROR_SUCCESS
|
||
|| RegQueryValueEx (reg_key, "InstallationDirectory", 0,
|
||
&type, gtk_installation_dir, &nbytes) != ERROR_SUCCESS
|
||
|| type != REG_SZ)
|
||
{
|
||
/* Uh oh. Use hard-coded %WinDir%\gtk+ value */
|
||
GetWindowsDirectory (win_dir, sizeof (win_dir));
|
||
sprintf (gtk_installation_dir, "%s\\gtk+", win_dir);
|
||
}
|
||
|
||
if (reg_key != NULL)
|
||
RegCloseKey (reg_key);
|
||
|
||
return gtk_installation_dir;
|
||
}
|
||
|
||
static char *
|
||
get_libdir (void)
|
||
{
|
||
static char *libdir = NULL;
|
||
|
||
if (libdir == NULL)
|
||
libdir = g_strdup_printf (gtk_win32_get_installation_directory (),
|
||
G_DIR_SEPARATOR_S,
|
||
"loaders",
|
||
NULL);
|
||
|
||
return libdir;
|
||
}
|
||
|
||
#define PIXBUF_LIBDIR get_libdir ()
|
||
|
||
#endif
|
||
|
||
/* actually load the image handler - gdk_pixbuf_get_module only get a */
|
||
/* reference to the module to load, it doesn't actually load it */
|
||
/* perhaps these actions should be combined in one function */
|
||
void
|
||
gdk_pixbuf_load_module (GdkPixbufModule *image_module)
|
||
{
|
||
char *module_name;
|
||
char *path;
|
||
GModule *module;
|
||
gpointer load_sym;
|
||
char *name;
|
||
|
||
g_return_if_fail (image_module->module == NULL);
|
||
|
||
name = image_module->module_name;
|
||
|
||
module_name = g_strconcat ("pixbufloader-", name, NULL);
|
||
path = g_module_build_path (PIXBUF_LIBDIR, module_name);
|
||
|
||
module = g_module_open (path, G_MODULE_BIND_LAZY);
|
||
if (!module) {
|
||
/* Debug feature, check in GDK_PIXBUF_MODULEDIR, or working directory */
|
||
char *dir = g_getenv ("GDK_PIXBUF_MODULEDIR");
|
||
if (!dir)
|
||
dir = "";
|
||
|
||
g_free (path);
|
||
path = g_module_build_path (dir, module_name);
|
||
module = g_module_open (path, G_MODULE_BIND_LAZY);
|
||
|
||
if (!module) {
|
||
g_warning ("Unable to load module: %s: %s", path, g_module_error ());
|
||
g_free (module_name);
|
||
g_free (path);
|
||
return;
|
||
}
|
||
g_free (path);
|
||
} else {
|
||
g_free (path);
|
||
}
|
||
|
||
g_free (module_name);
|
||
|
||
image_module->module = module;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_load", &load_sym))
|
||
image_module->load = load_sym;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_load_xpm_data", &load_sym))
|
||
image_module->load_xpm_data = load_sym;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_begin_load", &load_sym))
|
||
image_module->begin_load = load_sym;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_stop_load", &load_sym))
|
||
image_module->stop_load = load_sym;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_load_increment", &load_sym))
|
||
image_module->load_increment = load_sym;
|
||
|
||
if (pixbuf_module_symbol (module, name, "image_load_animation", &load_sym))
|
||
image_module->load_animation = load_sym;
|
||
}
|
||
#else
|
||
|
||
#define mname(type,fn) gdk_pixbuf__ ## type ## _image_ ##fn
|
||
#define m_load(type) extern GdkPixbuf * mname(type,load) (FILE *f);
|
||
#define m_load_xpm_data(type) extern GdkPixbuf * mname(type,load_xpm_data) (const char **data);
|
||
#define m_begin_load(type) \
|
||
extern gpointer mname(type,begin_load) (ModulePreparedNotifyFunc prepare_func, \
|
||
ModuleUpdatedNotifyFunc update_func, \
|
||
ModuleFrameDoneNotifyFunc frame_done_func,\
|
||
ModuleAnimationDoneNotifyFunc anim_done_func,\
|
||
gpointer user_data);
|
||
#define m_stop_load(type) extern void mname(type,stop_load) (gpointer context);
|
||
#define m_load_increment(type) extern gboolean mname(type,load_increment) (gpointer context, const guchar *buf, guint size);
|
||
#define m_load_animation(type) extern GdkPixbufAnimation * mname(type,load_animation) (FILE *f);
|
||
|
||
/* PNG */
|
||
m_load (png);
|
||
m_begin_load (png);
|
||
m_load_increment (png);
|
||
m_stop_load (png);
|
||
/* BMP */
|
||
m_load (bmp);
|
||
m_begin_load (bmp);
|
||
m_load_increment (bmp);
|
||
m_stop_load (bmp);
|
||
/* WBMP */
|
||
m_load (wbmp);
|
||
m_begin_load (wbmp);
|
||
m_load_increment (wbmp);
|
||
m_stop_load (wbmp);
|
||
/* GIF */
|
||
m_load (gif);
|
||
m_begin_load (gif);
|
||
m_load_increment (gif);
|
||
m_stop_load (gif);
|
||
m_load_animation (gif);
|
||
/* ICO */
|
||
m_load (ico);
|
||
m_begin_load (ico);
|
||
m_load_increment (ico);
|
||
m_stop_load (ico);
|
||
/* JPEG */
|
||
m_load (jpeg);
|
||
m_begin_load (jpeg);
|
||
m_load_increment (jpeg);
|
||
m_stop_load (jpeg);
|
||
/* PNM */
|
||
m_load (pnm);
|
||
m_begin_load (pnm);
|
||
m_load_increment (pnm);
|
||
m_stop_load (pnm);
|
||
/* RAS */
|
||
m_load (ras);
|
||
m_begin_load (ras);
|
||
m_load_increment (ras);
|
||
m_stop_load (ras);
|
||
/* TIFF */
|
||
m_load (tiff);
|
||
m_begin_load (tiff);
|
||
m_load_increment (tiff);
|
||
m_stop_load (tiff);
|
||
/* XPM */
|
||
m_load (xpm);
|
||
m_load_xpm_data (xpm);
|
||
|
||
void
|
||
gdk_pixbuf_load_module (GdkPixbufModule *image_module)
|
||
{
|
||
image_module->module = (void *) 1;
|
||
|
||
if (strcmp (image_module->module_name, "png") == 0){
|
||
image_module->load = mname (png,load);
|
||
image_module->begin_load = mname (png,begin_load);
|
||
image_module->load_increment = mname (png,load_increment);
|
||
image_module->stop_load = mname (png,stop_load);
|
||
return;
|
||
}
|
||
|
||
if (strcmp (image_module->module_name, "bmp") == 0){
|
||
image_module->load = mname (bmp,load);
|
||
image_module->begin_load = mname (bmp,begin_load);
|
||
image_module->load_increment = mname (bmp,load_increment);
|
||
image_module->stop_load = mname (bmp,stop_load);
|
||
return;
|
||
}
|
||
|
||
if (strcmp (image_module->module_name, "wbmp") == 0){
|
||
image_module->load = mname (wbmp,load);
|
||
image_module->begin_load = mname (wbmp,begin_load);
|
||
image_module->load_increment = mname (wbmp,load_increment);
|
||
image_module->stop_load = mname (wbmp,stop_load);
|
||
return;
|
||
}
|
||
|
||
if (strcmp (image_module->module_name, "gif") == 0){
|
||
image_module->load = mname (gif,load);
|
||
image_module->begin_load = mname (gif,begin_load);
|
||
image_module->load_increment = mname (gif,load_increment);
|
||
image_module->stop_load = mname (gif,stop_load);
|
||
image_module->load_animation = mname (gif,load_animation);
|
||
return;
|
||
}
|
||
|
||
if (strcmp (image_module->module_name, "ico") == 0){
|
||
image_module->load = mname (ico,load);
|
||
image_module->begin_load = mname (ico,begin_load);
|
||
image_module->load_increment = mname (ico,load_increment);
|
||
image_module->stop_load = mname (ico,stop_load);
|
||
return;
|
||
}
|
||
|
||
if (strcmp (image_module->module_name, "jpeg") == 0){
|
||
image_module->load = mname (jpeg,load);
|
||
image_module->begin_load = mname (jpeg,begin_load);
|
||
image_module->load_increment = mname (jpeg,load_increment);
|
||
image_module->stop_load = mname (jpeg,stop_load);
|
||
return;
|
||
}
|
||
if (strcmp (image_module->module_name, "pnm") == 0){
|
||
image_module->load = mname (pnm,load);
|
||
image_module->begin_load = mname (pnm,begin_load);
|
||
image_module->load_increment = mname (pnm,load_increment);
|
||
image_module->stop_load = mname (pnm,stop_load);
|
||
return;
|
||
}
|
||
if (strcmp (image_module->module_name, "ras") == 0){
|
||
image_module->load = mname (ras,load);
|
||
image_module->begin_load = mname (ras,begin_load);
|
||
image_module->load_increment = mname (ras,load_increment);
|
||
image_module->stop_load = mname (ras,stop_load);
|
||
return;
|
||
}
|
||
if (strcmp (image_module->module_name, "tiff") == 0){
|
||
image_module->load = mname (tiff,load);
|
||
image_module->begin_load = mname (tiff,begin_load);
|
||
image_module->load_increment = mname (tiff,load_increment);
|
||
image_module->stop_load = mname (tiff,stop_load);
|
||
return;
|
||
}
|
||
if (strcmp (image_module->module_name, "xpm") == 0){
|
||
image_module->load = mname (xpm,load);
|
||
image_module->load_xpm_data = mname (xpm,load_xpm_data);
|
||
return;
|
||
}
|
||
}
|
||
|
||
|
||
#endif
|
||
|
||
|
||
|
||
GdkPixbufModule *
|
||
gdk_pixbuf_get_named_module (const char *name)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; file_formats [i].module_name; i++) {
|
||
if (!strcmp(name, file_formats[i].module_name))
|
||
return &(file_formats[i]);
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
GdkPixbufModule *
|
||
gdk_pixbuf_get_module (guchar *buffer, guint size)
|
||
{
|
||
int i;
|
||
|
||
for (i = 0; file_formats [i].module_name; i++) {
|
||
if ((* file_formats [i].format_check) (buffer, size))
|
||
return &(file_formats[i]);
|
||
}
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/**
|
||
* 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;
|
||
}
|