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mutter-performance-source/clutter/x11/xsettings/xsettings-client.c
Emmanuele Bassi 98c3c84c00 x11: Add the XSETTINGS machinery 
Use the XSETTINGS machinery to get notification from foreign
environments about settings that might interest Clutter itself - namely:
the default font name, the font DPI, and the Xft font options that can
be mapped on cairo_font_options_t.
2010-06-21 15:55:36 +01:00

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/*
* Copyright © 2001, 2007 Red Hat, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Red Hat not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Red Hat makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* RED HAT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL RED HAT
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Author: Owen Taylor, Red Hat, Inc.
*/
#include "config.h"
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xmd.h> /* For CARD16 */
#include "xsettings-client.h"
struct _XSettingsClient
{
Display *display;
int screen;
XSettingsNotifyFunc notify;
XSettingsWatchFunc watch;
void *cb_data;
XSettingsGrabFunc grab;
XSettingsGrabFunc ungrab;
Window manager_window;
Atom manager_atom;
Atom selection_atom;
Atom xsettings_atom;
XSettingsList *settings;
};
static void
notify_changes (XSettingsClient *client,
XSettingsList *old_list)
{
XSettingsList *old_iter = old_list;
XSettingsList *new_iter = client->settings;
if (!client->notify)
return;
while (old_iter || new_iter)
{
int cmp;
if (old_iter && new_iter)
cmp = strcmp (old_iter->setting->name, new_iter->setting->name);
else if (old_iter)
cmp = -1;
else
cmp = 1;
if (cmp < 0)
{
client->notify (old_iter->setting->name,
XSETTINGS_ACTION_DELETED,
NULL,
client->cb_data);
}
else if (cmp == 0)
{
if (!xsettings_setting_equal (old_iter->setting,
new_iter->setting))
client->notify (old_iter->setting->name,
XSETTINGS_ACTION_CHANGED,
new_iter->setting,
client->cb_data);
}
else
{
client->notify (new_iter->setting->name,
XSETTINGS_ACTION_NEW,
new_iter->setting,
client->cb_data);
}
if (old_iter)
old_iter = old_iter->next;
if (new_iter)
new_iter = new_iter->next;
}
}
static int
ignore_errors (Display *display, XErrorEvent *event)
{
return True;
}
static char local_byte_order = '\0';
#define BYTES_LEFT(buffer) ((buffer)->data + (buffer)->len - (buffer)->pos)
static XSettingsResult
fetch_card16 (XSettingsBuffer *buffer,
CARD16 *result)
{
CARD16 x;
if (BYTES_LEFT (buffer) < 2)
return XSETTINGS_ACCESS;
x = *(CARD16 *)buffer->pos;
buffer->pos += 2;
if (buffer->byte_order == local_byte_order)
*result = x;
else
*result = (x << 8) | (x >> 8);
return XSETTINGS_SUCCESS;
}
static XSettingsResult
fetch_ushort (XSettingsBuffer *buffer,
unsigned short *result)
{
CARD16 x;
XSettingsResult r;
r = fetch_card16 (buffer, &x);
if (r == XSETTINGS_SUCCESS)
*result = x;
return r;
}
static XSettingsResult
fetch_card32 (XSettingsBuffer *buffer,
CARD32 *result)
{
CARD32 x;
if (BYTES_LEFT (buffer) < 4)
return XSETTINGS_ACCESS;
x = *(CARD32 *)buffer->pos;
buffer->pos += 4;
if (buffer->byte_order == local_byte_order)
*result = x;
else
*result = (x << 24) | ((x & 0xff00) << 8) | ((x & 0xff0000) >> 8) | (x >> 24);
return XSETTINGS_SUCCESS;
}
static XSettingsResult
fetch_card8 (XSettingsBuffer *buffer,
CARD8 *result)
{
if (BYTES_LEFT (buffer) < 1)
return XSETTINGS_ACCESS;
*result = *(CARD8 *)buffer->pos;
buffer->pos += 1;
return XSETTINGS_SUCCESS;
}
#define XSETTINGS_PAD(n,m) ((n + m - 1) & (~(m-1)))
static XSettingsList *
parse_settings (unsigned char *data,
size_t len)
{
XSettingsBuffer buffer;
XSettingsResult result = XSETTINGS_SUCCESS;
XSettingsList *settings = NULL;
CARD32 serial;
CARD32 n_entries;
CARD32 i;
XSettingsSetting *setting = NULL;
local_byte_order = xsettings_byte_order ();
buffer.pos = buffer.data = data;
buffer.len = len;
result = fetch_card8 (&buffer, (unsigned char *)&buffer.byte_order);
if (buffer.byte_order != MSBFirst &&
buffer.byte_order != LSBFirst)
{
fprintf (stderr, "Invalid byte order in XSETTINGS property\n");
result = XSETTINGS_FAILED;
goto out;
}
buffer.pos += 3;
result = fetch_card32 (&buffer, &serial);
if (result != XSETTINGS_SUCCESS)
goto out;
result = fetch_card32 (&buffer, &n_entries);
if (result != XSETTINGS_SUCCESS)
goto out;
for (i = 0; i < n_entries; i++)
{
CARD8 type;
CARD16 name_len;
CARD32 v_int;
size_t pad_len;
result = fetch_card8 (&buffer, &type);
if (result != XSETTINGS_SUCCESS)
goto out;
buffer.pos += 1;
result = fetch_card16 (&buffer, &name_len);
if (result != XSETTINGS_SUCCESS)
goto out;
pad_len = XSETTINGS_PAD(name_len, 4);
if (BYTES_LEFT (&buffer) < pad_len)
{
result = XSETTINGS_ACCESS;
goto out;
}
setting = malloc (sizeof *setting);
if (!setting)
{
result = XSETTINGS_NO_MEM;
goto out;
}
setting->type = XSETTINGS_TYPE_INT; /* No allocated memory */
setting->name = malloc (name_len + 1);
if (!setting->name)
{
result = XSETTINGS_NO_MEM;
goto out;
}
memcpy (setting->name, buffer.pos, name_len);
setting->name[name_len] = '\0';
buffer.pos += pad_len;
result = fetch_card32 (&buffer, &v_int);
if (result != XSETTINGS_SUCCESS)
goto out;
setting->last_change_serial = v_int;
switch (type)
{
case XSETTINGS_TYPE_INT:
result = fetch_card32 (&buffer, &v_int);
if (result != XSETTINGS_SUCCESS)
goto out;
setting->data.v_int = (INT32)v_int;
break;
case XSETTINGS_TYPE_STRING:
result = fetch_card32 (&buffer, &v_int);
if (result != XSETTINGS_SUCCESS)
goto out;
pad_len = XSETTINGS_PAD (v_int, 4);
if (v_int + 1 == 0 || /* Guard against wrap-around */
BYTES_LEFT (&buffer) < pad_len)
{
result = XSETTINGS_ACCESS;
goto out;
}
setting->data.v_string = malloc (v_int + 1);
if (!setting->data.v_string)
{
result = XSETTINGS_NO_MEM;
goto out;
}
memcpy (setting->data.v_string, buffer.pos, v_int);
setting->data.v_string[v_int] = '\0';
buffer.pos += pad_len;
break;
case XSETTINGS_TYPE_COLOR:
result = fetch_ushort (&buffer, &setting->data.v_color.red);
if (result != XSETTINGS_SUCCESS)
goto out;
result = fetch_ushort (&buffer, &setting->data.v_color.green);
if (result != XSETTINGS_SUCCESS)
goto out;
result = fetch_ushort (&buffer, &setting->data.v_color.blue);
if (result != XSETTINGS_SUCCESS)
goto out;
result = fetch_ushort (&buffer, &setting->data.v_color.alpha);
if (result != XSETTINGS_SUCCESS)
goto out;
break;
default:
/* Quietly ignore unknown types */
break;
}
setting->type = type;
result = xsettings_list_insert (&settings, setting);
if (result != XSETTINGS_SUCCESS)
goto out;
setting = NULL;
}
out:
if (result != XSETTINGS_SUCCESS)
{
switch (result)
{
case XSETTINGS_NO_MEM:
fprintf(stderr, "Out of memory reading XSETTINGS property\n");
break;
case XSETTINGS_ACCESS:
fprintf(stderr, "Invalid XSETTINGS property (read off end)\n");
break;
case XSETTINGS_DUPLICATE_ENTRY:
fprintf (stderr, "Duplicate XSETTINGS entry for '%s'\n", setting->name);
case XSETTINGS_FAILED:
case XSETTINGS_SUCCESS:
case XSETTINGS_NO_ENTRY:
break;
}
if (setting)
xsettings_setting_free (setting);
xsettings_list_free (settings);
settings = NULL;
}
return settings;
}
static void
read_settings (XSettingsClient *client)
{
Atom type;
int format;
unsigned long n_items;
unsigned long bytes_after;
unsigned char *data;
int result;
int (*old_handler) (Display *, XErrorEvent *);
XSettingsList *old_list = client->settings;
client->settings = NULL;
if (client->manager_window)
{
old_handler = XSetErrorHandler (ignore_errors);
result = XGetWindowProperty (client->display, client->manager_window,
client->xsettings_atom, 0, LONG_MAX,
False, client->xsettings_atom,
&type, &format, &n_items, &bytes_after, &data);
XSetErrorHandler (old_handler);
if (result == Success && type != None)
{
if (type != client->xsettings_atom)
{
fprintf (stderr, "Invalid type for XSETTINGS property");
}
else if (format != 8)
{
fprintf (stderr, "Invalid format for XSETTINGS property %d", format);
}
else
client->settings = parse_settings (data, n_items);
XFree (data);
}
}
notify_changes (client, old_list);
xsettings_list_free (old_list);
}
static void
add_events (Display *display,
Window window,
long mask)
{
XWindowAttributes attr;
XGetWindowAttributes (display, window, &attr);
XSelectInput (display, window, attr.your_event_mask | mask);
}
static void
check_manager_window (XSettingsClient *client)
{
if (client->manager_window && client->watch)
client->watch (client->manager_window, False, 0, client->cb_data);
if (client->grab)
client->grab (client->display);
else
XGrabServer (client->display);
client->manager_window = XGetSelectionOwner (client->display,
client->selection_atom);
if (client->manager_window)
XSelectInput (client->display, client->manager_window,
PropertyChangeMask | StructureNotifyMask);
if (client->ungrab)
client->ungrab (client->display);
else
XUngrabServer (client->display);
XFlush (client->display);
if (client->manager_window && client->watch)
{
if (!client->watch (client->manager_window, True,
PropertyChangeMask | StructureNotifyMask,
client->cb_data))
{
/* Inability to watch the window probably means that it was destroyed
* after we ungrabbed
*/
client->manager_window = None;
return;
}
}
read_settings (client);
}
XSettingsClient *
xsettings_client_new (Display *display,
int screen,
XSettingsNotifyFunc notify,
XSettingsWatchFunc watch,
void *cb_data)
{
return xsettings_client_new_with_grab_funcs (display, screen, notify, watch, cb_data,
NULL, NULL);
}
XSettingsClient *
xsettings_client_new_with_grab_funcs (Display *display,
int screen,
XSettingsNotifyFunc notify,
XSettingsWatchFunc watch,
void *cb_data,
XSettingsGrabFunc grab,
XSettingsGrabFunc ungrab)
{
XSettingsClient *client;
char buffer[256];
char *atom_names[3];
Atom atoms[3];
client = malloc (sizeof *client);
if (!client)
return NULL;
client->display = display;
client->screen = screen;
client->notify = notify;
client->watch = watch;
client->cb_data = cb_data;
client->grab = grab;
client->ungrab = ungrab;
client->manager_window = None;
client->settings = NULL;
sprintf(buffer, "_XSETTINGS_S%d", screen);
atom_names[0] = buffer;
atom_names[1] = "_XSETTINGS_SETTINGS";
atom_names[2] = "MANAGER";
#ifdef HAVE_XINTERNATOMS
XInternAtoms (display, atom_names, 3, False, atoms);
#else
atoms[0] = XInternAtom (display, atom_names[0], False);
atoms[1] = XInternAtom (display, atom_names[1], False);
atoms[2] = XInternAtom (display, atom_names[2], False);
#endif
client->selection_atom = atoms[0];
client->xsettings_atom = atoms[1];
client->manager_atom = atoms[2];
/* Select on StructureNotify so we get MANAGER events
*/
add_events (display, RootWindow (display, screen), StructureNotifyMask);
if (client->watch)
client->watch (RootWindow (display, screen), True, StructureNotifyMask,
client->cb_data);
check_manager_window (client);
return client;
}
void
xsettings_client_set_grab_func (XSettingsClient *client,
XSettingsGrabFunc grab)
{
client->grab = grab;
}
void
xsettings_client_set_ungrab_func (XSettingsClient *client,
XSettingsGrabFunc ungrab)
{
client->ungrab = ungrab;
}
void
xsettings_client_destroy (XSettingsClient *client)
{
if (client->watch)
client->watch (RootWindow (client->display, client->screen),
False, 0, client->cb_data);
if (client->manager_window && client->watch)
client->watch (client->manager_window, False, 0, client->cb_data);
xsettings_list_free (client->settings);
free (client);
}
XSettingsResult
xsettings_client_get_setting (XSettingsClient *client,
const char *name,
XSettingsSetting **setting)
{
XSettingsSetting *search = xsettings_list_lookup (client->settings, name);
if (search)
{
*setting = xsettings_setting_copy (search);
return *setting ? XSETTINGS_SUCCESS : XSETTINGS_NO_MEM;
}
else
return XSETTINGS_NO_ENTRY;
}
Bool
xsettings_client_process_event (XSettingsClient *client,
XEvent *xev)
{
/* The checks here will not unlikely cause us to reread
* the properties from the manager window a number of
* times when the manager changes from A->B. But manager changes
* are going to be pretty rare.
*/
if (xev->xany.window == RootWindow (client->display, client->screen))
{
if (xev->xany.type == ClientMessage &&
xev->xclient.message_type == client->manager_atom &&
xev->xclient.data.l[1] == client->selection_atom)
{
check_manager_window (client);
return True;
}
}
else if (xev->xany.window == client->manager_window)
{
if (xev->xany.type == DestroyNotify)
{
check_manager_window (client);
/* let GDK do its cleanup */
return False;
}
else if (xev->xany.type == PropertyNotify)
{
read_settings (client);
return True;
}
}
return False;
}
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