mutter/src/backends/meta-settings.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2017 Red Hat
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include "config.h"
#include "backends/meta-settings-private.h"
#include <gio/gio.h>
#include "backends/meta-backend-private.h"
#include "backends/meta-logical-monitor.h"
#include "backends/meta-monitor-manager-private.h"
#include "ui/theme-private.h"
enum
{
UI_SCALING_FACTOR_CHANGED,
GLOBAL_SCALING_FACTOR_CHANGED,
FONT_DPI_CHANGED,
EXPERIMENTAL_FEATURES_CHANGED,
N_SIGNALS
};
static guint signals[N_SIGNALS];
struct _MetaSettings
{
GObject parent;
MetaBackend *backend;
GSettings *interface_settings;
GSettings *mutter_settings;
int ui_scaling_factor;
int global_scaling_factor;
int font_dpi;
MetaExperimentalFeature experimental_features;
gboolean experimental_features_overridden;
};
G_DEFINE_TYPE (MetaSettings, meta_settings, G_TYPE_OBJECT)
static int
calculate_ui_scaling_factor (MetaSettings *settings)
{
MetaMonitorManager *monitor_manager =
meta_backend_get_monitor_manager (settings->backend);
GList *logical_monitors;
GList *l;
float max_scale = 1.0;
logical_monitors =
meta_monitor_manager_get_logical_monitors (monitor_manager);
for (l = logical_monitors; l; l = l->next)
{
MetaLogicalMonitor *logical_monitor = l->data;
max_scale = MAX (meta_logical_monitor_get_scale (logical_monitor),
max_scale);
}
g_warn_if_fail (fmodf (max_scale, 1.0) == 0.0);
return (int) max_scale;
}
static int
get_xsettings_scaling_factor (void)
{
GdkScreen *screen;
GValue value = G_VALUE_INIT;
g_value_init (&value, G_TYPE_INT);
screen = gdk_screen_get_default ();
if (gdk_screen_get_setting (screen, "gdk-window-scaling-factor", &value))
return g_value_get_int (&value);
else
return 1;
}
static gboolean
update_ui_scaling_factor (MetaSettings *settings)
{
int ui_scaling_factor;
if (meta_is_stage_views_scaled ())
{
ui_scaling_factor = 1;
}
else
{
if (meta_is_monitor_config_manager_enabled ())
ui_scaling_factor = calculate_ui_scaling_factor (settings);
else
ui_scaling_factor = get_xsettings_scaling_factor ();
}
if (settings->ui_scaling_factor != ui_scaling_factor)
{
settings->ui_scaling_factor = ui_scaling_factor;
return TRUE;
}
else
{
return FALSE;
}
}
static void
xft_dpi_changed (GtkSettings *gtk_settings,
GParamSpec *pspec,
MetaSettings *settings)
{
/* This only matters when we rely on XSettings. */
if (meta_is_monitor_config_manager_enabled ())
return;
meta_settings_update_ui_scaling_factor (settings);
}
static void
x11_display_opened (MetaBackend *backend,
MetaSettings *settings)
{
/*
* gdk-window-scaling-factor is not exported to gtk-settings
* because it is handled inside gdk, so we use gtk-xft-dpi instead
* which also changes when the scale factor changes.
*
* TODO: Only rely on our own configured scale when we only have
* MetaMonitorConfigManager.
*/
g_signal_connect (gtk_settings_get_default (), "notify::gtk-xft-dpi",
G_CALLBACK (xft_dpi_changed), settings);
}
void
meta_settings_update_ui_scaling_factor (MetaSettings *settings)
{
if (update_ui_scaling_factor (settings))
g_signal_emit (settings, signals[UI_SCALING_FACTOR_CHANGED], 0);
}
int
meta_settings_get_ui_scaling_factor (MetaSettings *settings)
{
g_assert (settings->ui_scaling_factor != 0);
return settings->ui_scaling_factor;
}
static gboolean
update_global_scaling_factor (MetaSettings *settings)
{
int global_scaling_factor;
global_scaling_factor =
(int) g_settings_get_uint (settings->interface_settings,
"scaling-factor");
if (settings->global_scaling_factor != global_scaling_factor)
{
settings->global_scaling_factor = global_scaling_factor;
return TRUE;
}
else
{
return FALSE;
}
}
gboolean
meta_settings_get_global_scaling_factor (MetaSettings *settings,
int *out_scaling_factor)
{
if (settings->global_scaling_factor == 0)
return FALSE;
*out_scaling_factor = settings->global_scaling_factor;
return TRUE;
}
static gboolean
update_font_dpi (MetaSettings *settings)
{
double text_scaling_factor;
/* Number of logical pixels on an inch when unscaled */
const double dots_per_inch = 96;
/* Being based on Xft, API users expect the DPI to be 1/1024th of an inch. */
const double xft_factor = 1024;
int font_dpi;
text_scaling_factor = g_settings_get_double (settings->interface_settings,
"text-scaling-factor");
font_dpi = (int) (text_scaling_factor *
dots_per_inch *
xft_factor *
settings->ui_scaling_factor);
if (font_dpi != settings->font_dpi)
{
settings->font_dpi = font_dpi;
g_object_set (clutter_settings_get_default (),
"font-dpi", font_dpi,
NULL);
return TRUE;
}
else
{
return FALSE;
}
}
static void
meta_settings_update_font_dpi (MetaSettings *settings)
{
if (update_font_dpi (settings))
g_signal_emit (settings, signals[FONT_DPI_CHANGED], 0);
}
int
meta_settings_get_font_dpi (MetaSettings *settings)
{
g_assert (settings->font_dpi != 0);
return settings->font_dpi;
}
static void
interface_settings_changed (GSettings *interface_settings,
const char *key,
MetaSettings *settings)
{
if (g_str_equal (key, "scaling-factor"))
{
if (update_global_scaling_factor (settings))
g_signal_emit (settings, signals[GLOBAL_SCALING_FACTOR_CHANGED], 0);
}
else if (g_str_equal (key, "text-scaling-factor"))
{
meta_settings_update_font_dpi (settings);
}
}
gboolean
meta_settings_is_experimental_feature_enabled (MetaSettings *settings,
MetaExperimentalFeature feature)
{
return !!(settings->experimental_features & feature);
}
void
meta_settings_override_experimental_features (MetaSettings *settings)
{
settings->experimental_features = META_EXPERIMENTAL_FEATURE_NONE;
settings->experimental_features_overridden = TRUE;
}
void
meta_settings_enable_experimental_feature (MetaSettings *settings,
MetaExperimentalFeature feature)
{
g_assert (settings->experimental_features_overridden);
settings->experimental_features |= feature;
}
static gboolean
experimental_features_handler (GVariant *features_variant,
gpointer *result,
gpointer data)
{
MetaSettings *settings = data;
GVariantIter features_iter;
char *feature;
MetaExperimentalFeature features = META_EXPERIMENTAL_FEATURE_NONE;
if (settings->experimental_features_overridden)
{
*result = GINT_TO_POINTER (FALSE);
return TRUE;
}
g_variant_iter_init (&features_iter, features_variant);
while (g_variant_iter_loop (&features_iter, "s", &feature))
{
/* So far no experimental features defined. */
if (g_str_equal (feature, "scale-monitor-framebuffer"))
features |= META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER;
else if (g_str_equal (feature, "monitor-config-manager"))
features |= META_EXPERIMENTAL_FEATURE_MONITOR_CONFIG_MANAGER;
else
g_info ("Unknown experimental feature '%s'\n", feature);
}
if (features != settings->experimental_features)
{
settings->experimental_features = features;
*result = GINT_TO_POINTER (TRUE);
}
else
{
*result = GINT_TO_POINTER (FALSE);
}
return TRUE;
}
static gboolean
update_experimental_features (MetaSettings *settings)
{
return GPOINTER_TO_INT (g_settings_get_mapped (settings->mutter_settings,
"experimental-features",
experimental_features_handler,
settings));
}
static void
mutter_settings_changed (GSettings *mutter_settings,
gchar *key,
MetaSettings *settings)
{
MetaExperimentalFeature old_experimental_features;
if (!g_str_equal (key, "experimental-features"))
return;
old_experimental_features = settings->experimental_features;
if (update_experimental_features (settings))
g_signal_emit (settings, signals[EXPERIMENTAL_FEATURES_CHANGED], 0,
(unsigned int) old_experimental_features);
}
MetaSettings *
meta_settings_new (MetaBackend *backend)
{
MetaSettings *settings;
settings = g_object_new (META_TYPE_SETTINGS, NULL);
settings->backend = backend;
g_signal_connect (backend, "x11-display-opened",
G_CALLBACK (x11_display_opened),
settings);
return settings;
}
static void
meta_settings_dispose (GObject *object)
{
MetaSettings *settings = META_SETTINGS (object);
g_clear_object (&settings->mutter_settings);
g_clear_object (&settings->interface_settings);
G_OBJECT_CLASS (meta_settings_parent_class)->dispose (object);
}
static void
meta_settings_init (MetaSettings *settings)
{
settings->interface_settings = g_settings_new ("org.gnome.desktop.interface");
g_signal_connect (settings->interface_settings, "changed",
G_CALLBACK (interface_settings_changed),
settings);
settings->mutter_settings = g_settings_new ("org.gnome.mutter");
g_signal_connect (settings->mutter_settings, "changed",
G_CALLBACK (mutter_settings_changed),
settings);
/* Chain up inter-dependent settings. */
g_signal_connect (settings, "global-scaling-factor-changed",
G_CALLBACK (meta_settings_update_ui_scaling_factor), NULL);
g_signal_connect (settings, "ui-scaling-factor-changed",
G_CALLBACK (meta_settings_update_font_dpi), NULL);
update_global_scaling_factor (settings);
update_experimental_features (settings);
}
void
meta_settings_post_init (MetaSettings *settings)
{
update_ui_scaling_factor (settings);
update_font_dpi (settings);
}
static void
meta_settings_class_init (MetaSettingsClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
object_class->dispose = meta_settings_dispose;
signals[UI_SCALING_FACTOR_CHANGED] =
g_signal_new ("ui-scaling-factor-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
signals[GLOBAL_SCALING_FACTOR_CHANGED] =
g_signal_new ("global-scaling-factor-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
signals[FONT_DPI_CHANGED] =
g_signal_new ("font-dpi-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 0);
signals[EXPERIMENTAL_FEATURES_CHANGED] =
g_signal_new ("experimental-features-changed",
G_TYPE_FROM_CLASS (object_class),
G_SIGNAL_RUN_LAST,
0,
NULL, NULL, NULL,
G_TYPE_NONE, 1, G_TYPE_UINT);
}