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gtk2/gdk-pixbuf/gdk-pixbuf-io.c
Matthias Clasen 7cb3f99fc7 Document 2.2 API additions.
2002-11-28 00:33:17 +00:00

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/* -*- mode: C; c-file-style: "linux" -*- */
/* 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 <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <glib.h>
#include <errno.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-io.h"
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif
static gint
format_check (GdkPixbufModule *module, guchar *buffer, int size)
{
int j;
gchar m;
GdkPixbufModulePattern *pattern;
for (pattern = module->info->signature; pattern->prefix; pattern++) {
for (j = 0; j < size && pattern->prefix[j] != 0; j++) {
m = pattern->mask ? pattern->mask[j] : ' ';
if (m == ' ') {
if (buffer[j] != pattern->prefix[j])
break;
}
else if (m == '!') {
if (buffer[j] == pattern->prefix[j])
break;
}
else if (m == 'z') {
if (buffer[j] != 0)
break;
}
else if (m == 'n') {
if (buffer[j] == 0)
break;
}
}
if (pattern->prefix[j] == 0)
return pattern->relevance;
}
return 0;
}
static GSList *file_formats = NULL;
static void gdk_pixbuf_io_init ();
static GSList *
get_file_formats ()
{
if (file_formats == NULL)
gdk_pixbuf_io_init ();
return file_formats;
}
#ifdef USE_GMODULE
static gboolean
scan_string (const char **pos, GString *out)
{
const char *p = *pos, *q = *pos;
char *tmp, *tmp2;
gboolean quoted;
while (g_ascii_isspace (*p))
p++;
if (!*p)
return FALSE;
else if (*p == '"') {
p++;
quoted = FALSE;
for (q = p; (*q != '"') || quoted; q++) {
if (!*q)
return FALSE;
quoted = (*q == '\\') && !quoted;
}
tmp = g_strndup (p, q - p);
tmp2 = g_strcompress (tmp);
g_string_truncate (out, 0);
g_string_append (out, tmp2);
g_free (tmp);
g_free (tmp2);
}
q++;
*pos = q;
return TRUE;
}
static gboolean
scan_int (const char **pos, int *out)
{
int i = 0;
char buf[32];
const char *p = *pos;
while (g_ascii_isspace (*p))
p++;
if (*p < '0' || *p > '9')
return FALSE;
while ((*p >= '0') && (*p <= '9') && i < sizeof (buf)) {
buf[i] = *p;
i++;
p++;
}
if (i == sizeof (buf))
return FALSE;
else
buf[i] = '\0';
*out = atoi (buf);
*pos = p;
return TRUE;
}
static gboolean
skip_space (const char **pos)
{
const char *p = *pos;
while (g_ascii_isspace (*p))
p++;
*pos = p;
return !(*p == '\0');
}
static gchar *
gdk_pixbuf_get_module_file (void)
{
gchar *result = g_strdup (g_getenv ("GDK_PIXBUF_MODULE_FILE"));
if (!result)
result = g_build_filename (GTK_SYSCONFDIR, "gtk-2.0", "gdk-pixbuf.loaders", NULL);
return result;
}
static void
gdk_pixbuf_io_init ()
{
GIOChannel *channel;
gchar *line_buf;
gsize term;
GString *tmp_buf = g_string_new (NULL);
gboolean have_error = FALSE;
GdkPixbufModule *module = NULL;
gchar *filename = gdk_pixbuf_get_module_file ();
int flags;
int n_patterns = 0;
GdkPixbufModulePattern *pattern;
GError *error = NULL;
channel = g_io_channel_new_file (filename, "r", &error);
if (!channel) {
g_warning ("Can not open pixbuf loader module file '%s': %s",
filename, error->message);
return;
}
while (!have_error && g_io_channel_read_line (channel, &line_buf, NULL, &term, NULL) == G_IO_STATUS_NORMAL) {
const char *p;
p = line_buf;
line_buf[term] = 0;
if (!skip_space (&p)) {
/* Blank line marking the end of a module
*/
if (module && *p != '#') {
file_formats = g_slist_prepend (file_formats, module);
module = NULL;
}
goto next_line;
}
if (*p == '#')
goto next_line;
if (!module) {
/* Read a module location
*/
module = g_new0 (GdkPixbufModule, 1);
n_patterns = 0;
if (!scan_string (&p, tmp_buf)) {
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
module->module_path = g_strdup (tmp_buf->str);
}
else if (!module->module_name) {
module->info = g_new0 (GdkPixbufFormat, 1);
if (!scan_string (&p, tmp_buf)) {
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
module->info->name = g_strdup (tmp_buf->str);
module->module_name = module->info->name;
if (!scan_int (&p, &flags)) {
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
module->info->flags = flags;
if (!scan_string (&p, tmp_buf)) {
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
if (tmp_buf->str[0] != 0)
module->info->domain = g_strdup (tmp_buf->str);
if (!scan_string (&p, tmp_buf)) {
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
module->info->description = g_strdup (tmp_buf->str);
}
else if (!module->info->mime_types) {
int n = 1;
module->info->mime_types = g_new0 (gchar*, 1);
while (scan_string (&p, tmp_buf)) {
if (tmp_buf->str[0] != 0) {
module->info->mime_types =
g_realloc (module->info->mime_types, (n + 1) * sizeof (gchar*));
module->info->mime_types[n - 1] = g_strdup (tmp_buf->str);
module->info->mime_types[n] = 0;
n++;
}
}
}
else if (!module->info->extensions) {
int n = 1;
module->info->extensions = g_new0 (gchar*, 1);
while (scan_string (&p, tmp_buf)) {
if (tmp_buf->str[0] != 0) {
module->info->extensions =
g_realloc (module->info->extensions, (n + 1) * sizeof (gchar*));
module->info->extensions[n - 1] = g_strdup (tmp_buf->str);
module->info->extensions[n] = 0;
n++;
}
}
}
else {
n_patterns++;
module->info->signature = (GdkPixbufModulePattern *)
g_realloc (module->info->signature, (n_patterns + 1) * sizeof (GdkPixbufModulePattern));
pattern = module->info->signature + n_patterns;
pattern->prefix = NULL;
pattern->mask = NULL;
pattern->relevance = 0;
pattern--;
if (!scan_string (&p, tmp_buf))
goto context_error;
pattern->prefix = g_strdup (tmp_buf->str);
if (!scan_string (&p, tmp_buf))
goto context_error;
if (*tmp_buf->str)
pattern->mask = g_strdup (tmp_buf->str);
else
pattern->mask = NULL;
if (!scan_int (&p, &pattern->relevance))
goto context_error;
goto next_line;
context_error:
g_free (pattern->prefix);
g_free (pattern->mask);
g_free (pattern);
g_warning ("Error parsing loader info in '%s'\n %s",
filename, line_buf);
have_error = TRUE;
}
next_line:
g_free (line_buf);
}
g_string_free (tmp_buf, TRUE);
g_io_channel_unref (channel);
g_free (filename);
}
#ifdef G_OS_WIN32
/* DllMain function needed to tuck away the gdk-pixbuf DLL name */
G_WIN32_DLLMAIN_FOR_DLL_NAME (static, dll_name)
static char *
get_libdir (void)
{
static char *libdir = NULL;
if (libdir == NULL)
libdir = g_win32_get_package_installation_subdirectory
(GETTEXT_PACKAGE, dll_name, "lib\\gtk-2.0\\" GTK_BINARY_VERSION "\\loaders");
return libdir;
}
#undef PIXBUF_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 */
gboolean
_gdk_pixbuf_load_module (GdkPixbufModule *image_module,
GError **error)
{
char *path;
GModule *module;
gpointer sym;
g_return_val_if_fail (image_module->module == NULL, FALSE);
path = image_module->module_path;
module = g_module_open (path, G_MODULE_BIND_LAZY);
if (!module) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Unable to load image-loading module: %s: %s"),
path, g_module_error ());
return FALSE;
}
image_module->module = module;
if (g_module_symbol (module, "fill_vtable", &sym)) {
GdkPixbufModuleFillVtableFunc func = (GdkPixbufModuleFillVtableFunc) sym;
(* func) (image_module);
return TRUE;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Image-loading module %s does not export the proper interface; perhaps it's from a different GTK version?"),
path);
return FALSE;
}
}
#else
#define module(type) \
extern void MODULE_ENTRY (type, fill_info) (GdkPixbufFormat *info); \
extern void MODULE_ENTRY (type, fill_vtable) (GdkPixbufModule *module)
module (png);
module (bmp);
module (wbmp);
module (gif);
module (ico);
module (ani);
module (jpeg);
module (pnm);
module (ras);
module (tiff);
module (xpm);
module (xbm);
module (tga);
gboolean
_gdk_pixbuf_load_module (GdkPixbufModule *image_module,
GError **error)
{
GdkPixbufModuleFillInfoFunc fill_info = NULL;
GdkPixbufModuleFillVtableFunc fill_vtable = NULL;
image_module->module = (void *) 1;
if (FALSE) {
/* Ugly hack so we can use else if unconditionally below ;-) */
}
#ifdef INCLUDE_png
else if (strcmp (image_module->module_name, "png") == 0) {
fill_info = MODULE_ENTRY (png, fill_info);
fill_vtable = MODULE_ENTRY (png, fill_vtable);
}
#endif
#ifdef INCLUDE_bmp
else if (strcmp (image_module->module_name, "bmp") == 0) {
fill_info = MODULE_ENTRY (bmp, fill_info);
fill_vtable = MODULE_ENTRY (bmp, fill_vtable);
}
#endif
#ifdef INCLUDE_wbmp
else if (strcmp (image_module->module_name, "wbmp") == 0) {
fill_info = MODULE_ENTRY (wbmp, fill_info);
fill_vtable = MODULE_ENTRY (wbmp, fill_vtable);
}
#endif
#ifdef INCLUDE_gif
else if (strcmp (image_module->module_name, "gif") == 0) {
fill_info = MODULE_ENTRY (gif, fill_info);
fill_vtable = MODULE_ENTRY (gif, fill_vtable);
}
#endif
#ifdef INCLUDE_ico
else if (strcmp (image_module->module_name, "ico") == 0) {
fill_info = MODULE_ENTRY (ico, fill_info);
fill_vtable = MODULE_ENTRY (ico, fill_vtable);
}
#endif
#ifdef INCLUDE_ani
else if (strcmp (image_module->module_name, "ani") == 0) {
fill_info = MODULE_ENTRY (ani, fill_info);
fill_vtable = MODULE_ENTRY (ani, fill_vtable);
}
#endif
#ifdef INCLUDE_jpeg
else if (strcmp (image_module->module_name, "jpeg") == 0) {
fill_info = MODULE_ENTRY (jpeg, fill_info);
fill_vtable = MODULE_ENTRY (jpeg, fill_vtable);
}
#endif
#ifdef INCLUDE_pnm
else if (strcmp (image_module->module_name, "pnm") == 0) {
fill_info = MODULE_ENTRY (pnm, fill_info);
fill_vtable = MODULE_ENTRY (pnm, fill_vtable);
}
#endif
#ifdef INCLUDE_ras
else if (strcmp (image_module->module_name, "ras") == 0) {
fill_info = MODULE_ENTRY (ras, fill_info);
fill_vtable = MODULE_ENTRY (ras, fill_vtable);
}
#endif
#ifdef INCLUDE_tiff
else if (strcmp (image_module->module_name, "tiff") == 0) {
fill_info = MODULE_ENTRY (tiff, fill_info);
fill_vtable = MODULE_ENTRY (tiff, fill_vtable);
}
#endif
#ifdef INCLUDE_xpm
else if (strcmp (image_module->module_name, "xpm") == 0) {
fill_info = MODULE_ENTRY (xpm, fill_info);
fill_vtable = MODULE_ENTRY (xpm, fill_vtable);
}
#endif
#ifdef INCLUDE_xbm
else if (strcmp (image_module->module_name, "xbm") == 0) {
fill_info = MODULE_ENTRY (xbm, fill_info);
fill_vtable = MODULE_ENTRY (xbm, fill_vtable);
}
#endif
#ifdef INCLUDE_tga
else if (strcmp (image_module->module_name, "tga") == 0) {
fill_info = MODULE_ENTRY (tga, fill_info);
fill_vtable = MODULE_ENTRY (tga, fill_vtable);
}
#endif
if (fill_vtable) {
(* fill_vtable) (image_module);
image_module->info = g_new0 (GdkPixbufFormat, 1);
(* fill_info) (image_module->info);
return TRUE;
} else {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Image type '%s' is not supported"),
image_module->module_name);
return FALSE;
}
}
static void
gdk_pixbuf_io_init ()
{
gchar *included_formats[] = {
"ani", "png", "bmp", "wbmp", "gif",
"ico", "jpeg", "pnm", "ras", "tiff",
"xpm", "xbm", "tga",
NULL
};
gchar **name;
GdkPixbufModule *module = NULL;
for (name = included_formats; *name; name++) {
module = g_new0 (GdkPixbufModule, 1);
module->module_name = *name;
if (_gdk_pixbuf_load_module (module, NULL))
file_formats = g_slist_prepend (file_formats, module);
else
g_free (module);
}
}
#endif
GdkPixbufModule *
_gdk_pixbuf_get_named_module (const char *name,
GError **error)
{
GSList *modules;
for (modules = get_file_formats (); modules; modules = g_slist_next (modules)) {
GdkPixbufModule *module = (GdkPixbufModule *)modules->data;
if (!strcmp (name, module->module_name))
return module;
}
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Image type '%s' is not supported"),
name);
return NULL;
}
GdkPixbufModule *
_gdk_pixbuf_get_module (guchar *buffer, guint size,
const gchar *filename,
GError **error)
{
GSList *modules;
gint score, best = 0;
GdkPixbufModule *selected = NULL;
for (modules = get_file_formats (); modules; modules = g_slist_next (modules)) {
GdkPixbufModule *module = (GdkPixbufModule *)modules->data;
score = format_check (module, buffer, size);
if (score > best) {
best = score;
selected = module;
}
if (score >= 100)
break;
}
if (selected != NULL)
return selected;
if (filename)
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Couldn't recognize the image file format for file '%s'"),
filename);
else
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Unrecognized image file format"));
return NULL;
}
static void
prepared_notify (GdkPixbuf *pixbuf,
GdkPixbufAnimation *anim,
gpointer user_data)
{
if (pixbuf != NULL)
g_object_ref (pixbuf);
*((GdkPixbuf **)user_data) = pixbuf;
}
GdkPixbuf *
_gdk_pixbuf_generic_image_load (GdkPixbufModule *module,
FILE *f,
GError **error)
{
guchar buffer[4096];
size_t length;
GdkPixbuf *pixbuf = NULL;
gpointer context;
if (module->load != NULL)
return (* module->load) (f, error);
context = module->begin_load (NULL, prepared_notify, NULL, &pixbuf, error);
if (!context)
return NULL;
while (!feof (f)) {
length = fread (buffer, 1, sizeof (buffer), f);
if (length > 0)
if (!module->load_increment (context, buffer, length, error)) {
module->stop_load (context, NULL);
if (pixbuf != NULL)
g_object_unref (pixbuf);
return NULL;
}
}
if (!module->stop_load (context, error)) {
if (pixbuf != NULL)
g_object_unref (pixbuf);
return NULL;
}
return pixbuf;
}
/**
* gdk_pixbuf_new_from_file:
* @filename: Name of file to load.
* @error: Return location for an error
*
* Creates a new pixbuf by loading an image from a file. The file format is
* detected automatically. If %NULL is returned, then @error will be set.
* Possible errors are in the #GDK_PIXBUF_ERROR and #G_FILE_ERROR domains.
*
* 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,
GError **error)
{
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) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open file '%s': %s"),
filename, g_strerror (errno));
return NULL;
}
size = fread (&buffer, 1, sizeof (buffer), f);
if (size == 0) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_CORRUPT_IMAGE,
_("Image file '%s' contains no data"),
filename);
fclose (f);
return NULL;
}
image_module = _gdk_pixbuf_get_module (buffer, size, filename, error);
if (image_module == NULL) {
fclose (f);
return NULL;
}
if (image_module->module == NULL)
if (!_gdk_pixbuf_load_module (image_module, error)) {
fclose (f);
return NULL;
}
fseek (f, 0, SEEK_SET);
pixbuf = _gdk_pixbuf_generic_image_load (image_module, f, error);
fclose (f);
if (pixbuf == NULL && error != NULL && *error == NULL) {
/* I don't trust these crufty longjmp()'ing image libs
* to maintain proper error invariants, and I don't
* want user code to segfault as a result. We need to maintain
* the invariastable/gdk-pixbuf/nt that error gets set if NULL is returned.
*/
g_warning ("Bug! gdk-pixbuf loader '%s' didn't set an error on failure.", image_module->module_name);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load image '%s': reason not known, probably a corrupt image file"),
filename);
} else if (error != NULL && *error != NULL) {
/* Add the filename to the error message */
GError *e = *error;
gchar *old;
old = e->message;
e->message = g_strdup_printf (_("Failed to load image '%s': %s"),
filename, old);
g_free (old);
}
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;
GError *error = NULL;
GdkPixbufModule *xpm_module = _gdk_pixbuf_get_named_module ("xpm", NULL);
if (xpm_module->module == NULL) {
if (!_gdk_pixbuf_load_module (xpm_module, &error)) {
g_warning ("Error loading XPM image loader: %s", error->message);
g_error_free (error);
return FALSE;
}
}
if (xpm_module->module == NULL) {
g_warning ("Can't find gdk-pixbuf module for parsing inline XPM data");
return NULL;
} else if (xpm_module->load_xpm_data == NULL) {
g_warning ("gdk-pixbuf XPM module lacks XPM data capability");
return NULL;
} else
load_xpm_data = xpm_module->load_xpm_data;
pixbuf = (* load_xpm_data) (data);
return pixbuf;
}
static void
collect_save_options (va_list opts,
gchar ***keys,
gchar ***vals)
{
gchar *key;
gchar *val;
gchar *next;
gint count;
count = 0;
*keys = NULL;
*vals = NULL;
next = va_arg (opts, gchar*);
while (next)
{
key = next;
val = va_arg (opts, gchar*);
++count;
/* woo, slow */
*keys = g_realloc (*keys, sizeof(gchar*) * (count + 1));
*vals = g_realloc (*vals, sizeof(gchar*) * (count + 1));
(*keys)[count-1] = g_strdup (key);
(*vals)[count-1] = g_strdup (val);
(*keys)[count] = NULL;
(*vals)[count] = NULL;
next = va_arg (opts, gchar*);
}
}
static gboolean
gdk_pixbuf_real_save (GdkPixbuf *pixbuf,
FILE *filehandle,
const char *type,
gchar **keys,
gchar **values,
GError **error)
{
GdkPixbufModule *image_module = NULL;
image_module = _gdk_pixbuf_get_named_module (type, error);
if (image_module == NULL)
return FALSE;
if (image_module->module == NULL)
if (!_gdk_pixbuf_load_module (image_module, error))
return FALSE;
if (image_module->save == NULL) {
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNSUPPORTED_OPERATION,
_("This build of gdk-pixbuf does not support saving the image format: %s"),
type);
return FALSE;
}
return (* image_module->save) (filehandle, pixbuf,
keys, values,
error);
}
/**
* gdk_pixbuf_save:
* @pixbuf: a #GdkPixbuf.
* @filename: name of file to save.
* @type: name of file format.
* @error: return location for error, or %NULL
* @Varargs: list of key-value save options
*
* Saves pixbuf to a file in @type, which is currently "jpeg" or
* "png". If @error is set, %FALSE will be returned. Possible errors include
* those in the #GDK_PIXBUF_ERROR domain and those in the #G_FILE_ERROR domain.
*
* The variable argument list should be %NULL-terminated; if not empty,
* it should contain pairs of strings that modify the save
* parameters. For example:
* <informalexample><programlisting>
* gdk_pixbuf_save (pixbuf, handle, "jpeg", &amp;error,
* "quality", "100", NULL);
* </programlisting></informalexample>
*
* Currently only few parameters exist. JPEG images can be saved with a
* "quality" parameter; its value should be in the range [0,100].
* Text chunks can be attached to PNG images by specifying parameters of
* the form "tEXt::key", where key is an ASCII string of length 1-79.
* The values are UTF-8 encoded strings.
*
* Return value: whether an error was set
**/
gboolean
gdk_pixbuf_save (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
GError **error,
...)
{
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
gboolean result;
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
result = gdk_pixbuf_savev (pixbuf, filename, type,
keys, values,
error);
g_strfreev (keys);
g_strfreev (values);
return result;
}
/**
* gdk_pixbuf_savev:
* @pixbuf: a #GdkPixbuf.
* @filename: name of file to save.
* @type: name of file format.
* @option_keys: name of options to set, %NULL-terminated
* @option_values: values for named options
* @error: return location for error, or %NULL
*
* Saves pixbuf to a file in @type, which is currently "jpeg" or "png".
* If @error is set, %FALSE will be returned. See gdk_pixbuf_save () for more
* details.
*
* Return value: whether an error was set
**/
gboolean
gdk_pixbuf_savev (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
char **option_keys,
char **option_values,
GError **error)
{
FILE *f = NULL;
gboolean result;
g_return_val_if_fail (filename != NULL, FALSE);
g_return_val_if_fail (type != NULL, FALSE);
f = fopen (filename, "wb");
if (f == NULL) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to open '%s' for writing: %s"),
filename, g_strerror (errno));
return FALSE;
}
result = gdk_pixbuf_real_save (pixbuf, f, type,
option_keys, option_values,
error);
if (!result) {
g_return_val_if_fail (error == NULL || *error != NULL, FALSE);
fclose (f);
return FALSE;
}
if (fclose (f) < 0) {
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (errno),
_("Failed to close '%s' while writing image, all data may not have been saved: %s"),
filename, g_strerror (errno));
return FALSE;
}
return TRUE;
}
/**
* gdk_pixbuf_format_get_name:
* @format: a #GdkPixbufFormat
*
* Returns the name of the format.
*
* Return value: the name of the format.
*
* Since: 2.2
*/
gchar *
gdk_pixbuf_format_get_name (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, NULL);
return g_strdup (format->name);
}
/**
* gdk_pixbuf_format_get_description:
* @format: a #GdkPixbufFormat
*
* Returns a description of the format.
*
* Return value: a description of the format.
*
* Since: 2.2
*/
gchar *
gdk_pixbuf_format_get_description (GdkPixbufFormat *format)
{
gchar *domain;
gchar *description;
g_return_val_if_fail (format != NULL, NULL);
if (format->domain != NULL)
domain = format->domain;
else
domain = GETTEXT_PACKAGE;
description = dgettext (domain, format->description);
return g_strdup (description);
}
/**
* gdk_pixbuf_format_get_mime_types:
* @format: a #GdkPixbufFormat
*
* Returns the mime types supported by the format.
*
* Return value: a %NULL-terminated array of mime types.
*
* Since: 2.2
*/
gchar **
gdk_pixbuf_format_get_mime_types (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, NULL);
return g_strdupv (format->mime_types);
}
/**
* gdk_pixbuf_format_get_extensions:
* @format: a #GdkPixbufFormat
*
* Returns the filename extensions typically used for files in the
* given format.
*
* Return value: a %NULL-terminated array of filename extensions.
*
* Since: 2.2
*/
gchar **
gdk_pixbuf_format_get_extensions (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, NULL);
return g_strdupv (format->extensions);
}
/**
* gdk_pixbuf_format_is_writable:
* @format: a #GdkPixbufFormat
*
* Returns whether pixbufs can be saved in the given format.
*
* Return value: whether pixbufs can be saved in the given format.
*
* Since: 2.2
*/
gboolean
gdk_pixbuf_format_is_writable (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, FALSE);
return (format->flags & GDK_PIXBUF_FORMAT_WRITABLE) != 0;
}
GdkPixbufFormat *
_gdk_pixbuf_get_format (GdkPixbufModule *module)
{
g_return_val_if_fail (module != NULL, NULL);
return module->info;
}
/**
* gdk_pixbuf_get_formats:
*
* Obtains the available information about the image formats supported
* by GdkPixbuf.
*
* Returns: A list of #GdkPixbufFormat<!-- -->s describing the supported
* image formats. The list should be freed when it is no longer needed,
* but the structures themselves are owned by #GdkPixbuf and should not be
* freed.
*
* Since: 2.2
*/
GSList *
gdk_pixbuf_get_formats (void)
{
GSList *result = NULL;
GSList *modules;
for (modules = get_file_formats (); modules; modules = g_slist_next (modules)) {
GdkPixbufModule *module = (GdkPixbufModule *)modules->data;
GdkPixbufFormat *info = _gdk_pixbuf_get_format (module);
result = g_slist_prepend (result, info);
}
return result;
}
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