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gtk/gdk/x11/xsettings-client.c
Luca Bacci ac60bc6095 X11: Provide settings in logical pixels 
This makes GtkSettings values on X11 match what we get on
other backends.

Reporting size settings in logical pixels (i.e for scale
== 1) is useful for properly supporting mixed-DPI setups.
As X11 doesn't support mixed-DPI setups anyway, XSettings
doesn't bother providing logical values. Thus we scale
from physical to logical values ourselves.

Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/5223
Fixes https://gitlab.gnome.org/GNOME/gtk/-/issues/5230
2022-11-01 13:09:28 +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 "xsettings-client.h"
#include <gdk/x11/gdkx11display.h>
#include <gdk/x11/gdkx11property.h>
#include <gdk/x11/gdkx11screen.h>
#include <gdk/x11/gdkx11surface.h>
#include <gdk/x11/gdkprivate-x11.h>
#include <gdk/x11/gdkdisplay-x11.h>
#include <gdk/x11/gdkscreen-x11.h>
#include <string.h>
#include <X11/Xlib.h>
#include <X11/Xmd.h> /* For CARD16 */
typedef enum
{
GDK_SETTING_ACTION_NEW,
GDK_SETTING_ACTION_CHANGED,
GDK_SETTING_ACTION_DELETED
} GdkSettingAction;
#include "gdksettings.c"
/* Types of settings possible. Enum values correspond to
* protocol values.
*/
typedef enum
{
XSETTINGS_TYPE_INT = 0,
XSETTINGS_TYPE_STRING = 1,
XSETTINGS_TYPE_COLOR = 2
} XSettingsType;
typedef struct _XSettingsBuffer XSettingsBuffer;
struct _XSettingsBuffer
{
char byte_order;
size_t len;
unsigned char *data;
unsigned char *pos;
};
static void
gdk_xsettings_notify (GdkX11Screen *x11_screen,
const char *name,
GdkSettingAction action)
{
gdk_display_setting_changed (x11_screen->display, name);
}
static gboolean
value_equal (const GValue *value_a,
const GValue *value_b)
{
if (G_VALUE_TYPE (value_a) != G_VALUE_TYPE (value_b))
return FALSE;
switch (G_VALUE_TYPE (value_a))
{
case G_TYPE_INT:
return g_value_get_int (value_a) == g_value_get_int (value_b);
case XSETTINGS_TYPE_COLOR:
return gdk_rgba_equal (g_value_get_boxed (value_a), g_value_get_boxed (value_b));
case G_TYPE_STRING:
return g_str_equal (g_value_get_string (value_a), g_value_get_string (value_b));
default:
g_warning ("unable to compare values of type %s", g_type_name (G_VALUE_TYPE (value_a)));
return FALSE;
}
}
static void
notify_changes (GdkX11Screen *x11_screen,
GHashTable *old_list)
{
GHashTableIter iter;
GValue *setting, *old_setting;
const char *name;
if (x11_screen->xsettings != NULL)
{
g_hash_table_iter_init (&iter, x11_screen->xsettings);
while (g_hash_table_iter_next (&iter, (gpointer *) &name, (gpointer*) &setting))
{
old_setting = old_list ? g_hash_table_lookup (old_list, name) : NULL;
if (old_setting == NULL)
gdk_xsettings_notify (x11_screen, name, GDK_SETTING_ACTION_NEW);
else if (!value_equal (setting, old_setting))
gdk_xsettings_notify (x11_screen, name, GDK_SETTING_ACTION_CHANGED);
/* remove setting from old_list */
if (old_setting != NULL)
g_hash_table_remove (old_list, name);
}
}
if (old_list != NULL)
{
/* old_list now contains only deleted settings */
g_hash_table_iter_init (&iter, old_list);
while (g_hash_table_iter_next (&iter, (gpointer *) &name, (gpointer*) &old_setting))
gdk_xsettings_notify (x11_screen, name, GDK_SETTING_ACTION_DELETED);
}
}
#define BYTES_LEFT(buffer) ((buffer)->data + (buffer)->len - (buffer)->pos)
#define return_if_fail_bytes(buffer, n_bytes) G_STMT_START{ \
if (BYTES_LEFT (buffer) < (n_bytes)) \
{ \
g_warning ("Invalid XSETTINGS property (read off end: Expected %u bytes, only %"G_GSIZE_FORMAT" left", \
(n_bytes), BYTES_LEFT (buffer)); \
return FALSE; \
} \
}G_STMT_END
static gboolean
fetch_card16 (XSettingsBuffer *buffer,
CARD16 *result)
{
CARD16 x;
return_if_fail_bytes (buffer, 2);
x = *(CARD16 *)buffer->pos;
buffer->pos += 2;
if (buffer->byte_order == MSBFirst)
*result = GUINT16_FROM_BE (x);
else
*result = GUINT16_FROM_LE (x);
return TRUE;
}
static gboolean
fetch_ushort (XSettingsBuffer *buffer,
unsigned short *result)
{
CARD16 x;
gboolean r;
r = fetch_card16 (buffer, &x);
if (r)
*result = x;
return r;
}
static gboolean
fetch_card32 (XSettingsBuffer *buffer,
CARD32 *result)
{
CARD32 x;
return_if_fail_bytes (buffer, 4);
x = *(CARD32 *)buffer->pos;
buffer->pos += 4;
if (buffer->byte_order == MSBFirst)
*result = GUINT32_FROM_BE (x);
else
*result = GUINT32_FROM_LE (x);
return TRUE;
}
static gboolean
fetch_card8 (XSettingsBuffer *buffer,
CARD8 *result)
{
return_if_fail_bytes (buffer, 1);
*result = *(CARD8 *)buffer->pos;
buffer->pos += 1;
return TRUE;
}
#define XSETTINGS_PAD(n,m) ((n + m - 1) & (~(m-1)))
static gboolean
fetch_string (XSettingsBuffer *buffer,
guint length,
char **result)
{
guint pad_len;
pad_len = XSETTINGS_PAD (length, 4);
if (pad_len < length) /* guard against overflow */
{
g_warning ("Invalid XSETTINGS property (overflow in string length)");
return FALSE;
}
return_if_fail_bytes (buffer, pad_len);
*result = g_strndup ((char *) buffer->pos, length);
buffer->pos += pad_len;
return TRUE;
}
static void
free_value (gpointer data)
{
GValue *value = data;
g_value_unset (value);
g_free (value);
}
static GHashTable *
parse_settings (unsigned char *data,
size_t len)
{
XSettingsBuffer buffer;
GHashTable *settings = NULL;
CARD32 serial;
CARD32 n_entries;
CARD32 i;
GValue *value = NULL;
char *x_name = NULL;
const char *gdk_name;
buffer.pos = buffer.data = data;
buffer.len = len;
if (!fetch_card8 (&buffer, (unsigned char *)&buffer.byte_order))
goto out;
if (buffer.byte_order != MSBFirst &&
buffer.byte_order != LSBFirst)
{
g_warning ("Invalid XSETTINGS property (unknown byte order %u)", buffer.byte_order);
goto out;
}
buffer.pos += 3;
if (!fetch_card32 (&buffer, &serial) ||
!fetch_card32 (&buffer, &n_entries))
goto out;
GDK_DEBUG (SETTINGS, "reading %lu settings (serial %lu byte order %u)",
(unsigned long)n_entries, (unsigned long)serial, buffer.byte_order);
for (i = 0; i < n_entries; i++)
{
CARD8 type;
CARD16 name_len;
CARD32 v_int;
if (!fetch_card8 (&buffer, &type))
goto out;
buffer.pos += 1;
if (!fetch_card16 (&buffer, &name_len))
goto out;
if (!fetch_string (&buffer, name_len, &x_name) ||
/* last change serial (we ignore it) */
!fetch_card32 (&buffer, &v_int))
goto out;
switch (type)
{
case XSETTINGS_TYPE_INT:
if (!fetch_card32 (&buffer, &v_int))
goto out;
value = g_new0 (GValue, 1);
g_value_init (value, G_TYPE_INT);
g_value_set_int (value, (gint32) v_int);
GDK_DEBUG (SETTINGS, " %s = %d", x_name, (gint32) v_int);
break;
case XSETTINGS_TYPE_STRING:
{
char *s;
if (!fetch_card32 (&buffer, &v_int) ||
!fetch_string (&buffer, v_int, &s))
goto out;
value = g_new0 (GValue, 1);
g_value_init (value, G_TYPE_STRING);
g_value_take_string (value, s);
GDK_DEBUG (SETTINGS, " %s = \"%s\"", x_name, s);
}
break;
case XSETTINGS_TYPE_COLOR:
{
unsigned short red, green, blue, alpha;
GdkRGBA rgba;
if (!fetch_ushort (&buffer, &red) ||
!fetch_ushort (&buffer, &green) ||
!fetch_ushort (&buffer, &blue) ||
!fetch_ushort (&buffer, &alpha))
goto out;
rgba.red = red / 65535.0;
rgba.green = green / 65535.0;
rgba.blue = blue / 65535.0;
rgba.alpha = alpha / 65535.0;
value = g_new0 (GValue, 1);
g_value_init (value, GDK_TYPE_RGBA);
g_value_set_boxed (value, &rgba);
GDK_DEBUG (SETTINGS, " %s = #%02X%02X%02X%02X", x_name, alpha,red, green, blue);
}
break;
default:
/* Quietly ignore unknown types */
GDK_DEBUG (SETTINGS, " %s = ignored (unknown type %u)", x_name, type);
break;
}
gdk_name = gdk_from_xsettings_name (x_name);
g_free (x_name);
x_name = NULL;
if (gdk_name == NULL)
{
GDK_DEBUG (SETTINGS, " ==> unknown to GTK");
free_value (value);
}
else
{
GDK_DEBUG (SETTINGS, " ==> storing as '%s'", gdk_name);
if (settings == NULL)
settings = g_hash_table_new_full (g_str_hash, g_str_equal,
NULL,
free_value);
if (g_hash_table_lookup (settings, gdk_name) != NULL)
{
g_warning ("Invalid XSETTINGS property (Duplicate entry for '%s')", gdk_name);
goto out;
}
g_hash_table_insert (settings, (gpointer) gdk_name, value);
}
value = NULL;
}
return settings;
out:
if (value)
free_value (value);
if (settings)
g_hash_table_unref (settings);
g_free (x_name);
return NULL;
}
static void
read_settings (GdkX11Screen *x11_screen,
gboolean do_notify)
{
GdkDisplay *display = x11_screen->display;
Atom type;
int format;
unsigned long n_items;
unsigned long bytes_after;
unsigned char *data;
int result;
GHashTable *old_list = x11_screen->xsettings;
GValue value = G_VALUE_INIT;
GValue *setting, *copy;
x11_screen->xsettings = NULL;
if (x11_screen->xsettings_manager_window != 0)
{
Atom xsettings_atom = gdk_x11_get_xatom_by_name_for_display (display, "_XSETTINGS_SETTINGS");
gdk_x11_display_error_trap_push (display);
result = XGetWindowProperty (gdk_x11_display_get_xdisplay (display),
x11_screen->xsettings_manager_window,
xsettings_atom, 0, LONG_MAX,
False, xsettings_atom,
&type, &format, &n_items, &bytes_after, &data);
gdk_x11_display_error_trap_pop_ignored (display);
if (result == Success && type != None)
{
if (type != xsettings_atom)
{
g_warning ("Invalid type for XSETTINGS property: %s", gdk_x11_get_xatom_name_for_display (display, type));
}
else if (format != 8)
{
g_warning ("Invalid format for XSETTINGS property: %d", format);
}
else
x11_screen->xsettings = parse_settings (data, n_items);
XFree (data);
}
}
/* Since we support scaling we look at the specific Gdk/UnscaledDPI
setting if it exists and use that instead of Xft/DPI if it is set */
if (x11_screen->xsettings && !x11_screen->fixed_surface_scale)
{
setting = g_hash_table_lookup (x11_screen->xsettings, "gdk-unscaled-dpi");
if (setting)
{
copy = g_new0 (GValue, 1);
g_value_init (copy, G_VALUE_TYPE (setting));
g_value_copy (setting, copy);
g_hash_table_insert (x11_screen->xsettings,
(gpointer) "gtk-xft-dpi", copy);
}
}
g_value_init (&value, G_TYPE_INT);
if (!x11_screen->fixed_surface_scale &&
gdk_display_get_setting (display, "gdk-window-scaling-factor", &value))
_gdk_x11_screen_set_surface_scale (x11_screen, g_value_get_int (&value));
/* XSettings gives us the cursor theme size in physical pixel size,
* while we want logical pixel values instead.
*/
if (x11_screen->surface_scale > 1 &&
gdk_display_get_setting (display, "gtk-cursor-theme-size", &value))
{
int cursor_theme_size = g_value_get_int (&value);
copy = g_new0 (GValue, 1);
g_value_init (copy, G_TYPE_INT);
g_value_set_int (copy, cursor_theme_size / x11_screen->surface_scale);
g_hash_table_insert (x11_screen->xsettings,
(gpointer) "gtk-cursor-theme-size", copy);
}
if (do_notify)
notify_changes (x11_screen, old_list);
if (old_list)
g_hash_table_unref (old_list);
}
static Atom
get_selection_atom (GdkX11Screen *x11_screen)
{
return _gdk_x11_get_xatom_for_display_printf (x11_screen->display, "_XSETTINGS_S%d", x11_screen->screen_num);
}
static void
check_manager_window (GdkX11Screen *x11_screen,
gboolean notify_changes)
{
GdkDisplay *display;
Display *xdisplay;
display = x11_screen->display;
xdisplay = gdk_x11_display_get_xdisplay (display);
gdk_x11_display_grab (display);
if (!(gdk_display_get_debug_flags (display) & GDK_DEBUG_DEFAULT_SETTINGS))
x11_screen->xsettings_manager_window = XGetSelectionOwner (xdisplay, get_selection_atom (x11_screen));
if (x11_screen->xsettings_manager_window != 0)
XSelectInput (xdisplay,
x11_screen->xsettings_manager_window,
PropertyChangeMask | StructureNotifyMask);
gdk_x11_display_ungrab (display);
gdk_display_flush (display);
read_settings (x11_screen, notify_changes);
}
GdkFilterReturn
gdk_xsettings_root_window_filter (const XEvent *xev,
gpointer data)
{
GdkX11Screen *x11_screen = data;
GdkDisplay *display = x11_screen->display;
/* 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.type == ClientMessage &&
xev->xclient.message_type == gdk_x11_get_xatom_by_name_for_display (display, "MANAGER") &&
xev->xclient.data.l[1] == get_selection_atom (x11_screen))
{
check_manager_window (x11_screen, TRUE);
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
GdkFilterReturn
gdk_xsettings_manager_window_filter (const XEvent *xev,
gpointer data)
{
GdkX11Screen *x11_screen = data;
if (xev->xany.type == DestroyNotify)
{
check_manager_window (x11_screen, TRUE);
/* let GDK do its cleanup */
return GDK_FILTER_CONTINUE;
}
else if (xev->xany.type == PropertyNotify)
{
read_settings (x11_screen, TRUE);
return GDK_FILTER_REMOVE;
}
return GDK_FILTER_CONTINUE;
}
void
_gdk_x11_xsettings_init (GdkX11Screen *x11_screen)
{
check_manager_window (x11_screen, FALSE);
}
void
_gdk_x11_settings_force_reread (GdkX11Screen *x11_screen)
{
read_settings (x11_screen, TRUE);
}
void
_gdk_x11_xsettings_finish (GdkX11Screen *x11_screen)
{
if (x11_screen->xsettings_manager_window)
x11_screen->xsettings_manager_window = 0;
if (x11_screen->xsettings)
{
g_hash_table_unref (x11_screen->xsettings);
x11_screen->xsettings = NULL;
}
}
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