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gtk/gdk-pixbuf/gdk-pixbuf-io.c
Christian Dywan e72435f9d0 Implement "compression" option in the TIFF pixbuf loader 
This enables applications to read out the compression of a TIFF image
and also makes it possible to apply the same or a different
compression when saving.

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=584700
2009-11-30 13:55:12 +01:00

2663 lines
67 KiB
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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 <errno.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <glib.h>
#include <gio/gio.h>
#include "gdk-pixbuf-private.h"
#include "gdk-pixbuf-io.h"
#include "gdk-pixbuf-loader.h"
#include "gdk-pixbuf-alias.h"
#include <glib/gstdio.h>
#ifdef G_OS_WIN32
#define STRICT
#include <windows.h>
#undef STRICT
#endif
#define SNIFF_BUFFER_SIZE 4096
#define LOAD_BUFFER_SIZE 65536
#ifndef GDK_PIXBUF_USE_GIO_MIME
static gint
format_check (GdkPixbufModule *module, guchar *buffer, int size)
{
int i, j;
gchar m;
GdkPixbufModulePattern *pattern;
gboolean anchored;
guchar *prefix;
gchar *mask;
for (pattern = module->info->signature; pattern->prefix; pattern++) {
if (pattern->mask && pattern->mask[0] == '*') {
prefix = (guchar *)pattern->prefix + 1;
mask = pattern->mask + 1;
anchored = FALSE;
}
else {
prefix = (guchar *)pattern->prefix;
mask = pattern->mask;
anchored = TRUE;
}
for (i = 0; i < size; i++) {
for (j = 0; i + j < size && prefix[j] != 0; j++) {
m = mask ? mask[j] : ' ';
if (m == ' ') {
if (buffer[i + j] != prefix[j])
break;
}
else if (m == '!') {
if (buffer[i + j] == prefix[j])
break;
}
else if (m == 'z') {
if (buffer[i + j] != 0)
break;
}
else if (m == 'n') {
if (buffer[i + j] == 0)
break;
}
}
if (prefix[j] == 0)
return pattern->relevance;
if (anchored)
break;
}
}
return 0;
}
#endif
G_LOCK_DEFINE_STATIC (init_lock);
G_LOCK_DEFINE_STATIC (threadunsafe_loader_lock);
gboolean
_gdk_pixbuf_lock (GdkPixbufModule *image_module)
{
if (g_threads_got_initialized &&
!(image_module->info->flags & GDK_PIXBUF_FORMAT_THREADSAFE)) {
G_LOCK (threadunsafe_loader_lock);
return TRUE;
}
return FALSE;
}
void
_gdk_pixbuf_unlock (GdkPixbufModule *image_module)
{
if (!(image_module->info->flags & GDK_PIXBUF_FORMAT_THREADSAFE)) {
G_UNLOCK (threadunsafe_loader_lock);
}
}
static GSList *file_formats = NULL;
static void gdk_pixbuf_io_init (void);
static GSList *
get_file_formats (void)
{
G_LOCK (init_lock);
if (file_formats == NULL)
gdk_pixbuf_io_init ();
G_UNLOCK (init_lock);
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');
}
#ifdef G_OS_WIN32
/* DllMain function needed to tuck away the gdk-pixbuf DLL handle */
static HMODULE gdk_pixbuf_dll;
BOOL WINAPI
DllMain (HINSTANCE hinstDLL,
DWORD fdwReason,
LPVOID lpvReserved)
{
switch (fdwReason) {
case DLL_PROCESS_ATTACH:
gdk_pixbuf_dll = (HMODULE) hinstDLL;
break;
}
return TRUE;
}
static char *
get_toplevel (void)
{
static char *toplevel = NULL;
if (toplevel == NULL)
toplevel = g_win32_get_package_installation_directory_of_module (gdk_pixbuf_dll);
return toplevel;
}
static char *
get_sysconfdir (void)
{
static char *sysconfdir = NULL;
if (sysconfdir == NULL)
sysconfdir = g_build_filename (get_toplevel (), "etc", NULL);
return sysconfdir;
}
#undef GTK_SYSCONFDIR
#define GTK_SYSCONFDIR get_sysconfdir()
static void
correct_prefix (gchar **path)
{
if (strncmp (*path, GTK_PREFIX "/", strlen (GTK_PREFIX "/")) == 0 ||
strncmp (*path, GTK_PREFIX "\\", strlen (GTK_PREFIX "\\")) == 0)
{
gchar *tem = NULL;
if (strlen(*path) > 5 && strncmp (*path - 5, ".libs", 5) == 0)
{
/* We are being run from inside the build tree, and shouldn't mess about. */
return;
}
/* This is an entry put there by gdk-pixbuf-query-loaders on the
* packager's system. On Windows a prebuilt GTK+ package can be
* installed in a random location. The gdk-pixbuf.loaders file
* distributed in such a package contains paths from the package
* builder's machine. Replace the build-time prefix with the
* installation prefix on this machine.
*/
tem = *path;
*path = g_strconcat (get_toplevel (), tem + strlen (GTK_PREFIX), NULL);
g_free (tem);
}
}
#endif /* G_OS_WIN32 */
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;
}
#endif /* USE_GMODULE */
static gboolean
gdk_pixbuf_load_module_unlocked (GdkPixbufModule *image_module,
GError **error);
static void
gdk_pixbuf_io_init (void)
{
#ifdef USE_GMODULE
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;
#endif
GdkPixbufModule *builtin_module ;
/* initialize on separate line to avoid compiler warnings in the
* common case of no compiled-in modules.
*/
builtin_module = NULL;
#define load_one_builtin_module(format) \
builtin_module = g_new0 (GdkPixbufModule, 1); \
builtin_module->module_name = #format; \
if (gdk_pixbuf_load_module_unlocked (builtin_module, NULL)) \
file_formats = g_slist_prepend (file_formats, builtin_module);\
else \
g_free (builtin_module)
#ifdef INCLUDE_ani
load_one_builtin_module (ani);
#endif
#ifdef INCLUDE_png
load_one_builtin_module (png);
#endif
#ifdef INCLUDE_bmp
load_one_builtin_module (bmp);
#endif
#ifdef INCLUDE_wbmp
load_one_builtin_module (wbmp);
#endif
#ifdef INCLUDE_gif
load_one_builtin_module (gif);
#endif
#ifdef INCLUDE_ico
load_one_builtin_module (ico);
#endif
#ifdef INCLUDE_jpeg
load_one_builtin_module (jpeg);
#endif
#ifdef INCLUDE_pnm
load_one_builtin_module (pnm);
#endif
#ifdef INCLUDE_ras
load_one_builtin_module (ras);
#endif
#ifdef INCLUDE_tiff
load_one_builtin_module (tiff);
#endif
#ifdef INCLUDE_xpm
load_one_builtin_module (xpm);
#endif
#ifdef INCLUDE_xbm
load_one_builtin_module (xbm);
#endif
#ifdef INCLUDE_tga
load_one_builtin_module (tga);
#endif
#ifdef INCLUDE_pcx
load_one_builtin_module (pcx);
#endif
#ifdef INCLUDE_icns
load_one_builtin_module (icns);
#endif
#ifdef INCLUDE_jasper
load_one_builtin_module (jasper);
#endif
#ifdef INCLUDE_qtif
load_one_builtin_module (qtif);
#endif
#ifdef INCLUDE_gdiplus
/* We don't bother having the GDI+ loaders individually selectable
* for building in or not.
*/
load_one_builtin_module (ico);
load_one_builtin_module (wmf);
load_one_builtin_module (emf);
load_one_builtin_module (bmp);
load_one_builtin_module (gif);
load_one_builtin_module (jpeg);
load_one_builtin_module (tiff);
#endif
#ifdef INCLUDE_gdip_png
/* Except the gdip-png loader which normally isn't built at all even */
load_one_builtin_module (png);
#endif
#undef load_one_builtin_module
#ifdef USE_GMODULE
channel = g_io_channel_new_file (filename, "r", &error);
if (!channel) {
/* Don't bother warning if we have some built-in loaders */
if (file_formats == NULL)
g_warning ("Cannot open pixbuf loader module file '%s': %s",
filename, error->message);
g_string_free (tmp_buf, TRUE);
g_free (filename);
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 != '#') {
#ifdef G_OS_WIN32
correct_prefix (&module->module_path);
#endif
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);
if (scan_string (&p, tmp_buf)) {
module->info->license = 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] = NULL;
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] = NULL;
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);
#endif
}
#define module(type) \
extern void _gdk_pixbuf__##type##_fill_info (GdkPixbufFormat *info); \
extern void _gdk_pixbuf__##type##_fill_vtable (GdkPixbufModule *module)
module (png);
module (jpeg);
module (gif);
module (ico);
module (ani);
module (ras);
module (xpm);
module (tiff);
module (pnm);
module (bmp);
module (wbmp);
module (xbm);
module (tga);
module (pcx);
module (icns);
module (jasper);
module (qtif);
module (gdip_ico);
module (gdip_wmf);
module (gdip_emf);
module (gdip_bmp);
module (gdip_gif);
module (gdip_jpeg);
module (gdip_png);
module (gdip_tiff);
#undef module
/* 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 */
static gboolean
gdk_pixbuf_load_module_unlocked (GdkPixbufModule *image_module,
GError **error)
{
GdkPixbufModuleFillInfoFunc fill_info = NULL;
GdkPixbufModuleFillVtableFunc fill_vtable = NULL;
if (image_module->module != NULL)
return TRUE;
#define try_module(format,id) \
if (fill_info == NULL && \
strcmp (image_module->module_name, #format) == 0) { \
fill_info = _gdk_pixbuf__##id##_fill_info; \
fill_vtable = _gdk_pixbuf__##id##_fill_vtable; \
}
#ifdef INCLUDE_png
try_module (png,png);
#endif
#ifdef INCLUDE_bmp
try_module (bmp,bmp);
#endif
#ifdef INCLUDE_wbmp
try_module (wbmp,wbmp);
#endif
#ifdef INCLUDE_gif
try_module (gif,gif);
#endif
#ifdef INCLUDE_ico
try_module (ico,ico);
#endif
#ifdef INCLUDE_ani
try_module (ani,ani);
#endif
#ifdef INCLUDE_jpeg
try_module (jpeg,jpeg);
#endif
#ifdef INCLUDE_pnm
try_module (pnm,pnm);
#endif
#ifdef INCLUDE_ras
try_module (ras,ras);
#endif
#ifdef INCLUDE_tiff
try_module (tiff,tiff);
#endif
#ifdef INCLUDE_xpm
try_module (xpm,xpm);
#endif
#ifdef INCLUDE_xbm
try_module (xbm,xbm);
#endif
#ifdef INCLUDE_tga
try_module (tga,tga);
#endif
#ifdef INCLUDE_pcx
try_module (pcx,pcx);
#endif
#ifdef INCLUDE_icns
try_module (icns,icns);
#endif
#ifdef INCLUDE_jasper
try_module (jasper,jasper);
#endif
#ifdef INCLUDE_qtif
try_module (qtif,qtif);
#endif
#ifdef INCLUDE_gdiplus
try_module (ico,gdip_ico);
try_module (wmf,gdip_wmf);
try_module (emf,gdip_emf);
try_module (bmp,gdip_bmp);
try_module (gif,gdip_gif);
try_module (jpeg,gdip_jpeg);
try_module (tiff,gdip_tiff);
#endif
#ifdef INCLUDE_gdip_png
try_module (png,gdip_png);
#endif
#undef try_module
if (fill_vtable) {
image_module->module = (void *) 1;
(* fill_vtable) (image_module);
if (image_module->info == NULL) {
image_module->info = g_new0 (GdkPixbufFormat, 1);
(* fill_info) (image_module->info);
}
return TRUE;
}
else
#ifdef USE_GMODULE
{
char *path;
GModule *module;
gpointer sym;
path = image_module->module_path;
module = g_module_open (path, G_MODULE_BIND_LAZY | G_MODULE_BIND_LOCAL);
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)) {
fill_vtable = (GdkPixbufModuleFillVtableFunc) sym;
(* fill_vtable) (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
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Image type '%s' is not supported"),
image_module->module_name);
return FALSE;
#endif /* !USE_GMODULE */
}
gboolean
_gdk_pixbuf_load_module (GdkPixbufModule *image_module,
GError **error)
{
gboolean ret;
gboolean locked = FALSE;
/* be extra careful, maybe the module initializes
* the thread system
*/
if (g_threads_got_initialized) {
G_LOCK (init_lock);
locked = TRUE;
}
ret = gdk_pixbuf_load_module_unlocked (image_module, error);
if (locked)
G_UNLOCK (init_lock);
return ret;
}
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 (module->info->disabled)
continue;
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;
GdkPixbufModule *selected = NULL;
gchar *display_name = NULL;
#ifdef GDK_PIXBUF_USE_GIO_MIME
gchar *mime_type;
gchar **mimes;
gchar *type;
gint j;
gboolean uncertain;
mime_type = g_content_type_guess (NULL, buffer, size, &uncertain);
if (uncertain)
mime_type = g_content_type_guess (filename, buffer, size, NULL);
for (modules = get_file_formats (); modules; modules = g_slist_next (modules)) {
GdkPixbufModule *module = (GdkPixbufModule *)modules->data;
GdkPixbufFormat *info = module->info;
if (info->disabled)
continue;
mimes = info->mime_types;
for (j = 0; mimes[j] != NULL; j++) {
type = g_content_type_from_mime_type (mimes[j]);
if (g_ascii_strcasecmp (type, mime_type) == 0) {
g_free (type);
selected = module;
break;
}
g_free (type);
}
}
g_free (mime_type);
#else
gint score, best = 0;
for (modules = get_file_formats (); modules; modules = g_slist_next (modules)) {
GdkPixbufModule *module = (GdkPixbufModule *)modules->data;
if (module->info->disabled)
continue;
score = format_check (module, buffer, size);
if (score > best) {
best = score;
selected = module;
}
if (score >= 100)
break;
}
#endif
if (selected != NULL)
return selected;
if (filename)
{
display_name = g_filename_display_name (filename);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_UNKNOWN_TYPE,
_("Couldn't recognize the image file format for file '%s'"),
display_name);
g_free (display_name);
}
else
g_set_error_literal (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[LOAD_BUFFER_SIZE];
size_t length;
GdkPixbuf *pixbuf = NULL;
GdkPixbufAnimation *animation = NULL;
gpointer context;
gboolean locked;
locked = _gdk_pixbuf_lock (module);
if (module->load != NULL) {
pixbuf = (* module->load) (f, error);
} else if (module->begin_load != NULL) {
context = module->begin_load (NULL, prepared_notify, NULL, &pixbuf, error);
if (!context)
goto out;
while (!feof (f) && !ferror (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);
pixbuf = NULL;
}
goto out;
}
}
if (!module->stop_load (context, error)) {
if (pixbuf != NULL) {
g_object_unref (pixbuf);
pixbuf = NULL;
}
}
} else if (module->load_animation != NULL) {
animation = (* module->load_animation) (f, error);
if (animation != NULL) {
pixbuf = gdk_pixbuf_animation_get_static_image (animation);
g_object_ref (pixbuf);
g_object_unref (animation);
}
}
out:
if (locked)
_gdk_pixbuf_unlock (module);
return pixbuf;
}
/**
* gdk_pixbuf_new_from_file:
* @filename: Name of file to load, in the GLib file name encoding
* @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[SNIFF_BUFFER_SIZE];
GdkPixbufModule *image_module;
gchar *display_name;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (error == NULL || *error == NULL, NULL);
display_name = g_filename_display_name (filename);
f = g_fopen (filename, "rb");
if (!f) {
gint save_errno = errno;
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to open file '%s': %s"),
display_name,
g_strerror (save_errno));
g_free (display_name);
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"),
display_name);
g_free (display_name);
fclose (f);
return NULL;
}
image_module = _gdk_pixbuf_get_module (buffer, size, filename, error);
if (image_module == NULL) {
g_free (display_name);
fclose (f);
return NULL;
}
if (!_gdk_pixbuf_load_module (image_module, error)) {
g_free (display_name);
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 invariant 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"),
display_name);
} 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"),
display_name,
old);
g_free (old);
}
g_free (display_name);
return pixbuf;
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_new_from_file
GdkPixbuf *
gdk_pixbuf_new_from_file (const char *filename,
GError **error)
{
gchar *utf8_filename =
g_locale_to_utf8 (filename, -1, NULL, NULL, error);
GdkPixbuf *retval;
if (utf8_filename == NULL)
return NULL;
retval = gdk_pixbuf_new_from_file_utf8 (utf8_filename, error);
g_free (utf8_filename);
return retval;
}
#endif
/**
* gdk_pixbuf_new_from_file_at_size:
* @filename: Name of file to load, in the GLib file name encoding
* @width: The width the image should have or -1 to not constrain the width
* @height: The height the image should have or -1 to not constrain the height
* @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.
*
* The image will be scaled to fit in the requested size, preserving
* the image's aspect ratio. Note that the returned pixbuf may be smaller
* than @width x @height, if the aspect ratio requires it. To load
* and image at the requested size, regardless of aspect ratio, use
* gdk_pixbuf_new_from_file_at_scale().
*
* 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.
*
* Since: 2.4
**/
GdkPixbuf *
gdk_pixbuf_new_from_file_at_size (const char *filename,
int width,
int height,
GError **error)
{
return gdk_pixbuf_new_from_file_at_scale (filename,
width, height,
TRUE, error);
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_new_from_file_at_size
GdkPixbuf *
gdk_pixbuf_new_from_file_at_size (const char *filename,
int width,
int height,
GError **error)
{
gchar *utf8_filename =
g_locale_to_utf8 (filename, -1, NULL, NULL, error);
GdkPixbuf *retval;
if (utf8_filename == NULL)
return NULL;
retval = gdk_pixbuf_new_from_file_at_size_utf8 (utf8_filename,
width, height,
error);
g_free (utf8_filename);
return retval;
}
#endif
typedef struct {
gint width;
gint height;
gboolean preserve_aspect_ratio;
} AtScaleData;
static void
at_scale_size_prepared_cb (GdkPixbufLoader *loader,
int width,
int height,
gpointer data)
{
AtScaleData *info = data;
g_return_if_fail (width > 0 && height > 0);
if (info->preserve_aspect_ratio &&
(info->width > 0 || info->height > 0)) {
if (info->width < 0)
{
width = width * (double)info->height/(double)height;
height = info->height;
}
else if (info->height < 0)
{
height = height * (double)info->width/(double)width;
width = info->width;
}
else if ((double)height * (double)info->width >
(double)width * (double)info->height) {
width = 0.5 + (double)width * (double)info->height / (double)height;
height = info->height;
} else {
height = 0.5 + (double)height * (double)info->width / (double)width;
width = info->width;
}
} else {
if (info->width > 0)
width = info->width;
if (info->height > 0)
height = info->height;
}
width = MAX (width, 1);
height = MAX (height, 1);
gdk_pixbuf_loader_set_size (loader, width, height);
}
/**
* gdk_pixbuf_new_from_file_at_scale:
* @filename: Name of file to load, in the GLib file name encoding
* @width: The width the image should have or -1 to not constrain the width
* @height: The height the image should have or -1 to not constrain the height
* @preserve_aspect_ratio: %TRUE to preserve the image's aspect ratio
* @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.
* The image will be scaled to fit in the requested size, optionally preserving
* the image's aspect ratio.
*
* When preserving the aspect ratio, a @width of -1 will cause the image
* to be scaled to the exact given height, and a @height of -1 will cause
* the image to be scaled to the exact given width. When not preserving
* aspect ratio, a @width or @height of -1 means to not scale the image
* at all in that dimension. Negative values for @width and @height are
* allowed since 2.8.
*
* 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.
*
* Since: 2.6
**/
GdkPixbuf *
gdk_pixbuf_new_from_file_at_scale (const char *filename,
int width,
int height,
gboolean preserve_aspect_ratio,
GError **error)
{
GdkPixbufLoader *loader;
GdkPixbuf *pixbuf;
guchar buffer[LOAD_BUFFER_SIZE];
int length;
FILE *f;
AtScaleData info;
GdkPixbufAnimation *animation;
GdkPixbufAnimationIter *iter;
gboolean has_frame;
g_return_val_if_fail (filename != NULL, NULL);
g_return_val_if_fail (width > 0 || width == -1, NULL);
g_return_val_if_fail (height > 0 || height == -1, NULL);
f = g_fopen (filename, "rb");
if (!f) {
gint save_errno = errno;
gchar *display_name = g_filename_display_name (filename);
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to open file '%s': %s"),
display_name,
g_strerror (save_errno));
g_free (display_name);
return NULL;
}
loader = gdk_pixbuf_loader_new ();
info.width = width;
info.height = height;
info.preserve_aspect_ratio = preserve_aspect_ratio;
g_signal_connect (loader, "size-prepared",
G_CALLBACK (at_scale_size_prepared_cb), &info);
has_frame = FALSE;
while (!has_frame && !feof (f) && !ferror (f)) {
length = fread (buffer, 1, sizeof (buffer), f);
if (length > 0)
if (!gdk_pixbuf_loader_write (loader, buffer, length, error)) {
gdk_pixbuf_loader_close (loader, NULL);
fclose (f);
g_object_unref (loader);
return NULL;
}
animation = gdk_pixbuf_loader_get_animation (loader);
if (animation) {
iter = gdk_pixbuf_animation_get_iter (animation, NULL);
if (!gdk_pixbuf_animation_iter_on_currently_loading_frame (iter)) {
has_frame = TRUE;
}
g_object_unref (iter);
}
}
fclose (f);
if (!gdk_pixbuf_loader_close (loader, error) && !has_frame) {
g_object_unref (loader);
return NULL;
}
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
if (!pixbuf) {
gchar *display_name = g_filename_display_name (filename);
g_object_unref (loader);
g_set_error (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_FAILED,
_("Failed to load image '%s': reason not known, probably a corrupt image file"),
display_name);
g_free (display_name);
return NULL;
}
g_object_ref (pixbuf);
g_object_unref (loader);
return pixbuf;
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_new_from_file_at_scale
GdkPixbuf *
gdk_pixbuf_new_from_file_at_scale (const char *filename,
int width,
int height,
gboolean preserve_aspect_ratio,
GError **error)
{
gchar *utf8_filename =
g_locale_to_utf8 (filename, -1, NULL, NULL, error);
GdkPixbuf *retval;
if (utf8_filename == NULL)
return NULL;
retval = gdk_pixbuf_new_from_file_at_scale_utf8 (utf8_filename,
width, height,
preserve_aspect_ratio,
error);
g_free (utf8_filename);
return retval;
}
#endif
static GdkPixbuf *
load_from_stream (GdkPixbufLoader *loader,
GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GdkPixbuf *pixbuf;
gssize n_read;
guchar buffer[LOAD_BUFFER_SIZE];
gboolean res;
res = TRUE;
while (1) {
n_read = g_input_stream_read (stream,
buffer,
sizeof (buffer),
cancellable,
error);
if (n_read < 0) {
res = FALSE;
error = NULL; /* Ignore further errors */
break;
}
if (n_read == 0)
break;
if (!gdk_pixbuf_loader_write (loader,
buffer,
n_read,
error)) {
res = FALSE;
error = NULL;
break;
}
}
if (!gdk_pixbuf_loader_close (loader, error)) {
res = FALSE;
error = NULL;
}
pixbuf = NULL;
if (res) {
pixbuf = gdk_pixbuf_loader_get_pixbuf (loader);
if (pixbuf)
g_object_ref (pixbuf);
}
return pixbuf;
}
/**
* gdk_pixbuf_new_from_stream_at_scale:
* @stream: a #GInputStream to load the pixbuf from
* @width: The width the image should have or -1 to not constrain the width
* @height: The height the image should have or -1 to not constrain the height
* @preserve_aspect_ratio: %TRUE to preserve the image's aspect ratio
* @cancellable: optional #GCancellable object, %NULL to ignore
* @error: Return location for an error
*
* Creates a new pixbuf by loading an image from an input stream.
*
* The file format is detected automatically. If %NULL is returned, then
* @error will be set. The @cancellable can be used to abort the operation
* from another thread. If the operation was cancelled, the error
* %GIO_ERROR_CANCELLED will be returned. Other possible errors are in
* the #GDK_PIXBUF_ERROR and %G_IO_ERROR domains.
*
* The image will be scaled to fit in the requested size, optionally
* preserving the image's aspect ratio. When preserving the aspect ratio,
* a @width of -1 will cause the image to be scaled to the exact given
* height, and a @height of -1 will cause the image to be scaled to the
* exact given width. When not preserving aspect ratio, a @width or
* @height of -1 means to not scale the image at all in that dimension.
*
* The stream is not closed.
*
* Return value: A newly-created pixbuf, or %NULL if any of several error
* conditions occurred: the file could not be opened, the image format is
* not supported, there was not enough memory to allocate the image buffer,
* the stream contained invalid data, or the operation was cancelled.
*
* Since: 2.14
*/
GdkPixbuf *
gdk_pixbuf_new_from_stream_at_scale (GInputStream *stream,
gint width,
gint height,
gboolean preserve_aspect_ratio,
GCancellable *cancellable,
GError **error)
{
GdkPixbufLoader *loader;
GdkPixbuf *pixbuf;
AtScaleData info;
loader = gdk_pixbuf_loader_new ();
info.width = width;
info.height = height;
info.preserve_aspect_ratio = preserve_aspect_ratio;
g_signal_connect (loader, "size-prepared",
G_CALLBACK (at_scale_size_prepared_cb), &info);
pixbuf = load_from_stream (loader, stream, cancellable, error);
g_object_unref (loader);
return pixbuf;
}
/**
* gdk_pixbuf_new_from_stream:
* @stream: a #GInputStream to load the pixbuf from
* @cancellable: optional #GCancellable object, %NULL to ignore
* @error: Return location for an error
*
* Creates a new pixbuf by loading an image from an input stream.
*
* The file format is detected automatically. If %NULL is returned, then
* @error will be set. The @cancellable can be used to abort the operation
* from another thread. If the operation was cancelled, the error
* %GIO_ERROR_CANCELLED will be returned. Other possible errors are in
* the #GDK_PIXBUF_ERROR and %G_IO_ERROR domains.
*
* The stream is not closed.
*
* Return value: A newly-created pixbuf, or %NULL if any of several error
* conditions occurred: the file could not be opened, the image format is
* not supported, there was not enough memory to allocate the image buffer,
* the stream contained invalid data, or the operation was cancelled.
*
* Since: 2.14
**/
GdkPixbuf *
gdk_pixbuf_new_from_stream (GInputStream *stream,
GCancellable *cancellable,
GError **error)
{
GdkPixbuf *pixbuf;
GdkPixbufLoader *loader;
loader = gdk_pixbuf_loader_new ();
pixbuf = load_from_stream (loader, stream, cancellable, error);
g_object_unref (loader);
return pixbuf;
}
static void
info_cb (GdkPixbufLoader *loader,
int width,
int height,
gpointer data)
{
struct {
GdkPixbufFormat *format;
int width;
int height;
} *info = data;
g_return_if_fail (width > 0 && height > 0);
info->format = gdk_pixbuf_loader_get_format (loader);
info->width = width;
info->height = height;
gdk_pixbuf_loader_set_size (loader, 0, 0);
}
/**
* gdk_pixbuf_get_file_info:
* @filename: The name of the file to identify.
* @width: Return location for the width of the image, or %NULL
* @height: Return location for the height of the image, or %NULL
*
* Parses an image file far enough to determine its format and size.
*
* Returns: A #GdkPixbufFormat describing the image format of the file
* or %NULL if the image format wasn't recognized. The return value
* is owned by GdkPixbuf and should not be freed.
*
* Since: 2.4
**/
GdkPixbufFormat *
gdk_pixbuf_get_file_info (const gchar *filename,
gint *width,
gint *height)
{
GdkPixbufLoader *loader;
guchar buffer[SNIFF_BUFFER_SIZE];
int length;
FILE *f;
struct {
GdkPixbufFormat *format;
gint width;
gint height;
} info;
g_return_val_if_fail (filename != NULL, NULL);
f = g_fopen (filename, "rb");
if (!f)
return NULL;
loader = gdk_pixbuf_loader_new ();
info.format = NULL;
info.width = -1;
info.height = -1;
g_signal_connect (loader, "size-prepared", G_CALLBACK (info_cb), &info);
while (!feof (f) && !ferror (f)) {
length = fread (buffer, 1, sizeof (buffer), f);
if (length > 0) {
if (!gdk_pixbuf_loader_write (loader, buffer, length, NULL))
break;
}
if (info.format != NULL)
break;
}
fclose (f);
gdk_pixbuf_loader_close (loader, NULL);
g_object_unref (loader);
if (width)
*width = info.width;
if (height)
*height = info.height;
return info.format;
}
/**
* 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;
gboolean locked;
g_return_val_if_fail (data != NULL, NULL);
xpm_module = _gdk_pixbuf_get_named_module ("xpm", &error);
if (xpm_module == NULL) {
g_warning ("Error loading XPM image loader: %s", error->message);
g_error_free (error);
return NULL;
}
if (!_gdk_pixbuf_load_module (xpm_module, &error)) {
g_warning ("Error loading XPM image loader: %s", error->message);
g_error_free (error);
return NULL;
}
locked = _gdk_pixbuf_lock (xpm_module);
if (xpm_module->load_xpm_data == NULL) {
g_warning ("gdk-pixbuf XPM module lacks XPM data capability");
pixbuf = NULL;
} else {
load_xpm_data = xpm_module->load_xpm_data;
pixbuf = (* load_xpm_data) (data);
}
if (locked)
_gdk_pixbuf_unlock (xpm_module);
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
save_to_file_callback (const gchar *buf,
gsize count,
GError **error,
gpointer data)
{
FILE *filehandle = data;
gsize n;
n = fwrite (buf, 1, count, filehandle);
if (n != count) {
gint save_errno = errno;
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Error writing to image file: %s"),
g_strerror (save_errno));
return FALSE;
}
return TRUE;
}
static gboolean
gdk_pixbuf_real_save (GdkPixbuf *pixbuf,
FILE *filehandle,
const char *type,
gchar **keys,
gchar **values,
GError **error)
{
gboolean ret;
GdkPixbufModule *image_module = NULL;
gboolean locked;
image_module = _gdk_pixbuf_get_named_module (type, error);
if (image_module == NULL)
return FALSE;
if (!_gdk_pixbuf_load_module (image_module, error))
return FALSE;
locked = _gdk_pixbuf_lock (image_module);
if (image_module->save) {
/* save normally */
ret = (* image_module->save) (filehandle, pixbuf,
keys, values,
error);
} else if (image_module->save_to_callback) {
/* save with simple callback */
ret = (* image_module->save_to_callback) (save_to_file_callback,
filehandle, pixbuf,
keys, values,
error);
} else {
/* can't save */
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);
ret = FALSE;
}
if (locked)
_gdk_pixbuf_unlock (image_module);
return ret;
}
#define TMP_FILE_BUF_SIZE 4096
static gboolean
save_to_callback_with_tmp_file (GdkPixbufModule *image_module,
GdkPixbuf *pixbuf,
GdkPixbufSaveFunc save_func,
gpointer user_data,
gchar **keys,
gchar **values,
GError **error)
{
int fd;
FILE *f = NULL;
gboolean retval = FALSE;
gchar *buf = NULL;
gsize n;
gchar *filename = NULL;
gboolean locked;
buf = g_try_malloc (TMP_FILE_BUF_SIZE);
if (buf == NULL) {
g_set_error_literal (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to save image to callback"));
goto end;
}
fd = g_file_open_tmp ("gdkpixbuf-save-tmp.XXXXXX", &filename, error);
if (fd == -1)
goto end;
f = fdopen (fd, "wb+");
if (f == NULL) {
gint save_errno = errno;
g_set_error_literal (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to open temporary file"));
goto end;
}
locked = _gdk_pixbuf_lock (image_module);
retval = (image_module->save) (f, pixbuf, keys, values, error);
if (locked)
_gdk_pixbuf_unlock (image_module);
if (!retval)
goto end;
rewind (f);
for (;;) {
n = fread (buf, 1, TMP_FILE_BUF_SIZE, f);
if (n > 0) {
if (!save_func (buf, n, error, user_data))
goto end;
}
if (n != TMP_FILE_BUF_SIZE)
break;
}
if (ferror (f)) {
gint save_errno = errno;
g_set_error_literal (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to read from temporary file"));
goto end;
}
retval = TRUE;
end:
/* cleanup and return retval */
if (f)
fclose (f);
if (filename) {
g_unlink (filename);
g_free (filename);
}
g_free (buf);
return retval;
}
static gboolean
gdk_pixbuf_real_save_to_callback (GdkPixbuf *pixbuf,
GdkPixbufSaveFunc save_func,
gpointer user_data,
const char *type,
gchar **keys,
gchar **values,
GError **error)
{
gboolean ret;
GdkPixbufModule *image_module = NULL;
gboolean locked;
image_module = _gdk_pixbuf_get_named_module (type, error);
if (image_module == NULL)
return FALSE;
if (!_gdk_pixbuf_load_module (image_module, error))
return FALSE;
locked = _gdk_pixbuf_lock (image_module);
if (image_module->save_to_callback) {
/* save normally */
ret = (* image_module->save_to_callback) (save_func, user_data,
pixbuf, keys, values,
error);
} else if (image_module->save) {
/* use a temporary file */
ret = save_to_callback_with_tmp_file (image_module, pixbuf,
save_func, user_data,
keys, values,
error);
} else {
/* can't save */
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);
ret = FALSE;
}
if (locked)
_gdk_pixbuf_unlock (image_module);
return ret;
}
/**
* 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 format @type. By default, "jpeg", "png", "ico"
* and "bmp" are possible file formats to save in, but more formats may be
* installed. The list of all writable formats can be determined in the
* following way:
*
* |[
* void add_if_writable (GdkPixbufFormat *data, GSList **list)
* {
* if (gdk_pixbuf_format_is_writable (data))
* *list = g_slist_prepend (*list, data);
* }
*
* GSList *formats = gdk_pixbuf_get_formats ();
* GSList *writable_formats = NULL;
* g_slist_foreach (formats, add_if_writable, &writable_formats);
* g_slist_free (formats);
* ]|
*
* 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. The PNG compression level can
* be specified using the "compression" parameter; it's value is in an
* integer in the range of [0,9].
*
* TIFF images recognize a "compression" option which acceps an integer value.
* Among the codecs are 1 None, 2 Huffman, 5 LZW, 7 JPEG and 8 Deflate, see
* the libtiff documentation and tiff.h for all supported codec values.
*
* ICO images can be saved in depth 16, 24, or 32, by using the "depth"
* parameter. When the ICO saver is given "x_hot" and "y_hot" parameters,
* it produces a CUR instead of an ICO.
*
* 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;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
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;
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_save
gboolean
gdk_pixbuf_save (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
GError **error,
...)
{
char *utf8_filename;
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
gboolean result;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
utf8_filename = g_locale_to_utf8 (filename, -1, NULL, NULL, error);
if (utf8_filename == NULL)
return FALSE;
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
result = gdk_pixbuf_savev_utf8 (pixbuf, utf8_filename, type,
keys, values,
error);
g_free (utf8_filename);
g_strfreev (keys);
g_strfreev (values);
return result;
}
#endif
/**
* 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", "png", "tiff", "ico" or "bmp".
* 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);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
f = g_fopen (filename, "wb");
if (f == NULL) {
gint save_errno = errno;
gchar *display_name = g_filename_display_name (filename);
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to open '%s' for writing: %s"),
display_name,
g_strerror (save_errno));
g_free (display_name);
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) {
gint save_errno = errno;
gchar *display_name = g_filename_display_name (filename);
g_set_error (error,
G_FILE_ERROR,
g_file_error_from_errno (save_errno),
_("Failed to close '%s' while writing image, all data may not have been saved: %s"),
display_name,
g_strerror (save_errno));
g_free (display_name);
return FALSE;
}
return TRUE;
}
#ifdef G_OS_WIN32
#undef gdk_pixbuf_savev
gboolean
gdk_pixbuf_savev (GdkPixbuf *pixbuf,
const char *filename,
const char *type,
char **option_keys,
char **option_values,
GError **error)
{
char *utf8_filename;
gboolean retval;
g_return_val_if_fail (filename != NULL, FALSE);
utf8_filename = g_locale_to_utf8 (filename, -1, NULL, NULL, error);
if (utf8_filename == NULL)
return FALSE;
retval = gdk_pixbuf_savev_utf8 (pixbuf, utf8_filename, type,
option_keys, option_values, error);
g_free (utf8_filename);
return retval;
}
#endif
/**
* gdk_pixbuf_save_to_callback:
* @pixbuf: a #GdkPixbuf.
* @save_func: a function that is called to save each block of data that
* the save routine generates.
* @user_data: user data to pass to the save function.
* @type: name of file format.
* @error: return location for error, or %NULL
* @Varargs: list of key-value save options
*
* Saves pixbuf in format @type by feeding the produced data to a
* callback. Can be used when you want to store the image to something
* other than a file, such as an in-memory buffer or a socket.
* If @error is set, %FALSE will be returned. Possible errors
* include those in the #GDK_PIXBUF_ERROR domain and whatever the save
* function generates.
*
* See gdk_pixbuf_save() for more details.
*
* Return value: whether an error was set
*
* Since: 2.4
**/
gboolean
gdk_pixbuf_save_to_callback (GdkPixbuf *pixbuf,
GdkPixbufSaveFunc save_func,
gpointer user_data,
const char *type,
GError **error,
...)
{
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
gboolean result;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
result = gdk_pixbuf_save_to_callbackv (pixbuf, save_func, user_data,
type, keys, values,
error);
g_strfreev (keys);
g_strfreev (values);
return result;
}
/**
* gdk_pixbuf_save_to_callbackv:
* @pixbuf: a #GdkPixbuf.
* @save_func: a function that is called to save each block of data that
* the save routine generates.
* @user_data: user data to pass to the save function.
* @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 callback in format @type, which is currently "jpeg",
* "png", "tiff", "ico" or "bmp". If @error is set, %FALSE will be returned. See
* gdk_pixbuf_save_to_callback () for more details.
*
* Return value: whether an error was set
*
* Since: 2.4
**/
gboolean
gdk_pixbuf_save_to_callbackv (GdkPixbuf *pixbuf,
GdkPixbufSaveFunc save_func,
gpointer user_data,
const char *type,
char **option_keys,
char **option_values,
GError **error)
{
gboolean result;
g_return_val_if_fail (save_func != NULL, FALSE);
g_return_val_if_fail (type != NULL, FALSE);
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
result = gdk_pixbuf_real_save_to_callback (pixbuf,
save_func, user_data, type,
option_keys, option_values,
error);
if (!result) {
g_return_val_if_fail (error == NULL || *error != NULL, FALSE);
return FALSE;
}
return TRUE;
}
/**
* gdk_pixbuf_save_to_buffer:
* @pixbuf: a #GdkPixbuf.
* @buffer: location to receive a pointer to the new buffer.
* @buffer_size: location to receive the size of the new buffer.
* @type: name of file format.
* @error: return location for error, or %NULL
* @Varargs: list of key-value save options
*
* Saves pixbuf to a new buffer in format @type, which is currently "jpeg",
* "png", "tiff", "ico" or "bmp". This is a convenience function that uses
* gdk_pixbuf_save_to_callback() to do the real work. Note that the buffer
* is not nul-terminated and may contain embedded nuls.
* If @error is set, %FALSE will be returned and @buffer will be set to
* %NULL. Possible errors include those in the #GDK_PIXBUF_ERROR
* domain.
*
* See gdk_pixbuf_save() for more details.
*
* Return value: whether an error was set
*
* Since: 2.4
**/
gboolean
gdk_pixbuf_save_to_buffer (GdkPixbuf *pixbuf,
gchar **buffer,
gsize *buffer_size,
const char *type,
GError **error,
...)
{
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
gboolean result;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
result = gdk_pixbuf_save_to_bufferv (pixbuf, buffer, buffer_size,
type, keys, values,
error);
g_strfreev (keys);
g_strfreev (values);
return result;
}
struct SaveToBufferData {
gchar *buffer;
gsize len, max;
};
static gboolean
save_to_buffer_callback (const gchar *data,
gsize count,
GError **error,
gpointer user_data)
{
struct SaveToBufferData *sdata = user_data;
gchar *new_buffer;
gsize new_max;
if (sdata->len + count > sdata->max) {
new_max = MAX (sdata->max*2, sdata->len + count);
new_buffer = g_try_realloc (sdata->buffer, new_max);
if (!new_buffer) {
g_set_error_literal (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to save image into a buffer"));
return FALSE;
}
sdata->buffer = new_buffer;
sdata->max = new_max;
}
memcpy (sdata->buffer + sdata->len, data, count);
sdata->len += count;
return TRUE;
}
/**
* gdk_pixbuf_save_to_bufferv:
* @pixbuf: a #GdkPixbuf.
* @buffer: location to receive a pointer to the new buffer.
* @buffer_size: location to receive the size of the new buffer.
* @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 new buffer in format @type, which is currently "jpeg",
* "tiff", "png", "ico" or "bmp". See gdk_pixbuf_save_to_buffer()
* for more details.
*
* Return value: whether an error was set
*
* Since: 2.4
**/
gboolean
gdk_pixbuf_save_to_bufferv (GdkPixbuf *pixbuf,
gchar **buffer,
gsize *buffer_size,
const char *type,
char **option_keys,
char **option_values,
GError **error)
{
static const gint initial_max = 1024;
struct SaveToBufferData sdata;
*buffer = NULL;
*buffer_size = 0;
sdata.buffer = g_try_malloc (initial_max);
sdata.max = initial_max;
sdata.len = 0;
if (!sdata.buffer) {
g_set_error_literal (error,
GDK_PIXBUF_ERROR,
GDK_PIXBUF_ERROR_INSUFFICIENT_MEMORY,
_("Insufficient memory to save image into a buffer"));
return FALSE;
}
if (!gdk_pixbuf_save_to_callbackv (pixbuf,
save_to_buffer_callback, &sdata,
type, option_keys, option_values,
error)) {
g_free (sdata.buffer);
return FALSE;
}
*buffer = sdata.buffer;
*buffer_size = sdata.len;
return TRUE;
}
typedef struct {
GOutputStream *stream;
GCancellable *cancellable;
} SaveToStreamData;
static gboolean
save_to_stream (const gchar *buffer,
gsize count,
GError **error,
gpointer data)
{
SaveToStreamData *sdata = (SaveToStreamData *)data;
gsize remaining;
gssize written;
GError *my_error = NULL;
remaining = count;
written = 0;
while (remaining > 0) {
buffer += written;
remaining -= written;
written = g_output_stream_write (sdata->stream,
buffer, remaining,
sdata->cancellable,
&my_error);
if (written < 0) {
if (!my_error) {
g_set_error_literal (error,
G_IO_ERROR, 0,
_("Error writing to image stream"));
}
else {
g_propagate_error (error, my_error);
}
return FALSE;
}
}
return TRUE;
}
/**
* gdk_pixbuf_save_to_stream:
* @pixbuf: a #GdkPixbuf
* @stream: a #GOutputStream to save the pixbuf to
* @type: name of file format
* @cancellable: optional #GCancellable object, %NULL to ignore
* @error: return location for error, or %NULL
* @Varargs: list of key-value save options
*
* Saves @pixbuf to an output stream.
*
* Supported file formats are currently "jpeg", "tiff", "png", "ico" or
* "bmp". See gdk_pixbuf_save_to_buffer() for more details.
*
* The @cancellable can be used to abort the operation from another
* thread. If the operation was cancelled, the error %GIO_ERROR_CANCELLED
* will be returned. Other possible errors are in the #GDK_PIXBUF_ERROR
* and %G_IO_ERROR domains.
*
* The stream is not closed.
*
* Returns: %TRUE if the pixbuf was saved successfully, %FALSE if an
* error was set.
*
* Since: 2.14
*/
gboolean
gdk_pixbuf_save_to_stream (GdkPixbuf *pixbuf,
GOutputStream *stream,
const char *type,
GCancellable *cancellable,
GError **error,
...)
{
gboolean res;
gchar **keys = NULL;
gchar **values = NULL;
va_list args;
SaveToStreamData data;
va_start (args, error);
collect_save_options (args, &keys, &values);
va_end (args);
data.stream = stream;
data.cancellable = cancellable;
res = gdk_pixbuf_save_to_callbackv (pixbuf, save_to_stream,
&data, type,
keys, values,
error);
g_strfreev (keys);
g_strfreev (values);
return res;
}
/**
* 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;
const gchar *description;
g_return_val_if_fail (format != NULL, NULL);
if (format->domain != NULL)
domain = format->domain;
else
domain = GETTEXT_PACKAGE;
description = g_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 which must be freed with
* g_strfreev() when it is no longer needed.
*
* 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 which must be
* freed with g_strfreev() when it is no longer needed.
*
* 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;
}
/**
* gdk_pixbuf_format_is_scalable:
* @format: a #GdkPixbufFormat
*
* Returns whether this image format is scalable. If a file is in a
* scalable format, it is preferable to load it at the desired size,
* rather than loading it at the default size and scaling the
* resulting pixbuf to the desired size.
*
* Return value: whether this image format is scalable.
*
* Since: 2.6
*/
gboolean
gdk_pixbuf_format_is_scalable (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, FALSE);
return (format->flags & GDK_PIXBUF_FORMAT_SCALABLE) != 0;
}
/**
* gdk_pixbuf_format_is_disabled:
* @format: a #GdkPixbufFormat
*
* Returns whether this image format is disabled. See
* gdk_pixbuf_format_set_disabled().
*
* Return value: whether this image format is disabled.
*
* Since: 2.6
*/
gboolean
gdk_pixbuf_format_is_disabled (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, FALSE);
return format->disabled;
}
/**
* gdk_pixbuf_format_set_disabled:
* @format: a #GdkPixbufFormat
* @disabled: %TRUE to disable the format @format
*
* Disables or enables an image format. If a format is disabled,
* gdk-pixbuf won't use the image loader for this format to load
* images. Applications can use this to avoid using image loaders
* with an inappropriate license, see gdk_pixbuf_format_get_license().
*
* Since: 2.6
*/
void
gdk_pixbuf_format_set_disabled (GdkPixbufFormat *format,
gboolean disabled)
{
g_return_if_fail (format != NULL);
format->disabled = disabled != FALSE;
}
/**
* gdk_pixbuf_format_get_license:
* @format: a #GdkPixbufFormat
*
* Returns information about the license of the image loader for the format. The
* returned string should be a shorthand for a wellknown license, e.g. "LGPL",
* "GPL", "QPL", "GPL/QPL", or "other" to indicate some other license. This
* string should be freed with g_free() when it's no longer needed.
*
* Returns: a string describing the license of @format.
*
* Since: 2.6
*/
gchar*
gdk_pixbuf_format_get_license (GdkPixbufFormat *format)
{
g_return_val_if_fail (format != NULL, NULL);
return g_strdup (format->license);
}
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;
}
#define __GDK_PIXBUF_IO_C__
#include "gdk-pixbuf-aliasdef.c"
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