b64c69e4bc
To support fractional scaling, the logical monitor scale must be stored as a float. No other functional changes is part of this commit. https://bugzilla.gnome.org/show_bug.cgi?id=765011
453 lines
12 KiB
C
453 lines
12 KiB
C
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* Copyright (C) 2017 Red Hat
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include "config.h"
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#include "backends/meta-settings-private.h"
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#include <gio/gio.h>
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#include "backends/meta-backend-private.h"
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#include "backends/meta-logical-monitor.h"
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#include "backends/meta-monitor-manager-private.h"
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#include "ui/theme-private.h"
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enum
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{
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UI_SCALING_FACTOR_CHANGED,
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GLOBAL_SCALING_FACTOR_CHANGED,
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FONT_DPI_CHANGED,
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EXPERIMENTAL_FEATURES_CHANGED,
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N_SIGNALS
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};
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static guint signals[N_SIGNALS];
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struct _MetaSettings
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{
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GObject parent;
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MetaBackend *backend;
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GSettings *interface_settings;
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GSettings *mutter_settings;
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int ui_scaling_factor;
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int global_scaling_factor;
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int font_dpi;
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MetaExperimentalFeature experimental_features;
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gboolean experimental_features_overridden;
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};
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G_DEFINE_TYPE (MetaSettings, meta_settings, G_TYPE_OBJECT)
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static int
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calculate_ui_scaling_factor (MetaSettings *settings)
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{
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MetaMonitorManager *monitor_manager =
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meta_backend_get_monitor_manager (settings->backend);
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GList *logical_monitors;
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GList *l;
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float max_scale = 1.0;
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logical_monitors =
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meta_monitor_manager_get_logical_monitors (monitor_manager);
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for (l = logical_monitors; l; l = l->next)
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{
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MetaLogicalMonitor *logical_monitor = l->data;
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max_scale = MAX (meta_logical_monitor_get_scale (logical_monitor),
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max_scale);
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}
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g_warn_if_fail (fmodf (max_scale, 1.0) == 0.0);
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return (int) max_scale;
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}
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static int
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get_xsettings_scaling_factor (void)
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{
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GdkScreen *screen;
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GValue value = G_VALUE_INIT;
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g_value_init (&value, G_TYPE_INT);
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screen = gdk_screen_get_default ();
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if (gdk_screen_get_setting (screen, "gdk-window-scaling-factor", &value))
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return g_value_get_int (&value);
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else
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return 1;
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}
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static gboolean
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update_ui_scaling_factor (MetaSettings *settings)
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{
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int ui_scaling_factor;
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if (meta_is_stage_views_scaled ())
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{
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ui_scaling_factor = 1;
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}
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else
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{
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if (meta_is_monitor_config_manager_enabled ())
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ui_scaling_factor = calculate_ui_scaling_factor (settings);
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else
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ui_scaling_factor = get_xsettings_scaling_factor ();
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}
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if (settings->ui_scaling_factor != ui_scaling_factor)
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{
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settings->ui_scaling_factor = ui_scaling_factor;
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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static void
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xft_dpi_changed (GtkSettings *gtk_settings,
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GParamSpec *pspec,
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MetaSettings *settings)
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{
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/* This only matters when we rely on XSettings. */
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if (meta_is_monitor_config_manager_enabled ())
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return;
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meta_settings_update_ui_scaling_factor (settings);
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}
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static void
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x11_display_opened (MetaBackend *backend,
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MetaSettings *settings)
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{
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/*
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* gdk-window-scaling-factor is not exported to gtk-settings
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* because it is handled inside gdk, so we use gtk-xft-dpi instead
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* which also changes when the scale factor changes.
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*
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* TODO: Only rely on our own configured scale when we only have
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* MetaMonitorConfigManager.
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*/
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g_signal_connect (gtk_settings_get_default (), "notify::gtk-xft-dpi",
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G_CALLBACK (xft_dpi_changed), settings);
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}
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void
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meta_settings_update_ui_scaling_factor (MetaSettings *settings)
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{
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if (update_ui_scaling_factor (settings))
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g_signal_emit (settings, signals[UI_SCALING_FACTOR_CHANGED], 0);
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}
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int
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meta_settings_get_ui_scaling_factor (MetaSettings *settings)
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{
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g_assert (settings->ui_scaling_factor != 0);
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return settings->ui_scaling_factor;
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}
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static gboolean
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update_global_scaling_factor (MetaSettings *settings)
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{
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int global_scaling_factor;
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global_scaling_factor =
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(int) g_settings_get_uint (settings->interface_settings,
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"scaling-factor");
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if (settings->global_scaling_factor != global_scaling_factor)
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{
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settings->global_scaling_factor = global_scaling_factor;
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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gboolean
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meta_settings_get_global_scaling_factor (MetaSettings *settings,
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int *out_scaling_factor)
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{
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if (settings->global_scaling_factor == 0)
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return FALSE;
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*out_scaling_factor = settings->global_scaling_factor;
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return TRUE;
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}
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static gboolean
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update_font_dpi (MetaSettings *settings)
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{
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double text_scaling_factor;
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/* Number of logical pixels on an inch when unscaled */
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const double dots_per_inch = 96;
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/* Being based on Xft, API users expect the DPI to be 1/1024th of an inch. */
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const double xft_factor = 1024;
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int font_dpi;
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text_scaling_factor = g_settings_get_double (settings->interface_settings,
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"text-scaling-factor");
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font_dpi = (int) (text_scaling_factor *
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dots_per_inch *
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xft_factor *
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settings->ui_scaling_factor);
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if (font_dpi != settings->font_dpi)
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{
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settings->font_dpi = font_dpi;
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g_object_set (clutter_settings_get_default (),
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"font-dpi", font_dpi,
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NULL);
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return TRUE;
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}
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else
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{
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return FALSE;
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}
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}
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static void
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meta_settings_update_font_dpi (MetaSettings *settings)
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{
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if (update_font_dpi (settings))
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g_signal_emit (settings, signals[FONT_DPI_CHANGED], 0);
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}
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int
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meta_settings_get_font_dpi (MetaSettings *settings)
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{
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g_assert (settings->font_dpi != 0);
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return settings->font_dpi;
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}
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static void
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interface_settings_changed (GSettings *interface_settings,
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const char *key,
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MetaSettings *settings)
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{
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if (g_str_equal (key, "scaling-factor"))
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{
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if (update_global_scaling_factor (settings))
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g_signal_emit (settings, signals[GLOBAL_SCALING_FACTOR_CHANGED], 0);
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}
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else if (g_str_equal (key, "text-scaling-factor"))
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{
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meta_settings_update_font_dpi (settings);
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}
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}
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gboolean
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meta_settings_is_experimental_feature_enabled (MetaSettings *settings,
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MetaExperimentalFeature feature)
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{
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return !!(settings->experimental_features & feature);
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}
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void
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meta_settings_override_experimental_features (MetaSettings *settings)
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{
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settings->experimental_features = META_EXPERIMENTAL_FEATURE_NONE;
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settings->experimental_features_overridden = TRUE;
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}
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void
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meta_settings_enable_experimental_feature (MetaSettings *settings,
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MetaExperimentalFeature feature)
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{
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g_assert (settings->experimental_features_overridden);
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settings->experimental_features |= feature;
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}
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static gboolean
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experimental_features_handler (GVariant *features_variant,
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gpointer *result,
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gpointer data)
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{
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MetaSettings *settings = data;
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GVariantIter features_iter;
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char *feature;
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MetaExperimentalFeature features = META_EXPERIMENTAL_FEATURE_NONE;
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if (settings->experimental_features_overridden)
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{
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*result = GINT_TO_POINTER (FALSE);
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return TRUE;
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}
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g_variant_iter_init (&features_iter, features_variant);
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while (g_variant_iter_loop (&features_iter, "s", &feature))
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{
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/* So far no experimental features defined. */
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if (g_str_equal (feature, "scale-monitor-framebuffer"))
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features |= META_EXPERIMENTAL_FEATURE_SCALE_MONITOR_FRAMEBUFFER;
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else if (g_str_equal (feature, "monitor-config-manager"))
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features |= META_EXPERIMENTAL_FEATURE_MONITOR_CONFIG_MANAGER;
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else
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g_info ("Unknown experimental feature '%s'\n", feature);
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}
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if (features != settings->experimental_features)
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{
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settings->experimental_features = features;
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*result = GINT_TO_POINTER (TRUE);
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}
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else
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{
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*result = GINT_TO_POINTER (FALSE);
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}
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return TRUE;
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}
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static gboolean
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update_experimental_features (MetaSettings *settings)
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{
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return GPOINTER_TO_INT (g_settings_get_mapped (settings->mutter_settings,
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"experimental-features",
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experimental_features_handler,
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settings));
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}
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static void
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mutter_settings_changed (GSettings *mutter_settings,
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gchar *key,
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MetaSettings *settings)
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{
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MetaExperimentalFeature old_experimental_features;
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if (!g_str_equal (key, "experimental-features"))
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return;
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old_experimental_features = settings->experimental_features;
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if (update_experimental_features (settings))
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g_signal_emit (settings, signals[EXPERIMENTAL_FEATURES_CHANGED], 0,
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(unsigned int) old_experimental_features);
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}
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MetaSettings *
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meta_settings_new (MetaBackend *backend)
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{
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MetaSettings *settings;
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settings = g_object_new (META_TYPE_SETTINGS, NULL);
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settings->backend = backend;
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g_signal_connect (backend, "x11-display-opened",
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G_CALLBACK (x11_display_opened),
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settings);
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return settings;
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}
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static void
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meta_settings_dispose (GObject *object)
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{
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MetaSettings *settings = META_SETTINGS (object);
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g_clear_object (&settings->mutter_settings);
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g_clear_object (&settings->interface_settings);
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G_OBJECT_CLASS (meta_settings_parent_class)->dispose (object);
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}
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static void
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meta_settings_init (MetaSettings *settings)
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{
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settings->interface_settings = g_settings_new ("org.gnome.desktop.interface");
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g_signal_connect (settings->interface_settings, "changed",
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G_CALLBACK (interface_settings_changed),
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settings);
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settings->mutter_settings = g_settings_new ("org.gnome.mutter");
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g_signal_connect (settings->mutter_settings, "changed",
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G_CALLBACK (mutter_settings_changed),
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settings);
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/* Chain up inter-dependent settings. */
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g_signal_connect (settings, "global-scaling-factor-changed",
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G_CALLBACK (meta_settings_update_ui_scaling_factor), NULL);
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g_signal_connect (settings, "ui-scaling-factor-changed",
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G_CALLBACK (meta_settings_update_font_dpi), NULL);
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update_global_scaling_factor (settings);
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update_experimental_features (settings);
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}
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void
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meta_settings_post_init (MetaSettings *settings)
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{
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update_ui_scaling_factor (settings);
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update_font_dpi (settings);
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}
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static void
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meta_settings_class_init (MetaSettingsClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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object_class->dispose = meta_settings_dispose;
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signals[UI_SCALING_FACTOR_CHANGED] =
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g_signal_new ("ui-scaling-factor-changed",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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signals[GLOBAL_SCALING_FACTOR_CHANGED] =
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g_signal_new ("global-scaling-factor-changed",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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signals[FONT_DPI_CHANGED] =
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g_signal_new ("font-dpi-changed",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL, NULL,
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G_TYPE_NONE, 0);
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signals[EXPERIMENTAL_FEATURES_CHANGED] =
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g_signal_new ("experimental-features-changed",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST,
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0,
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NULL, NULL, NULL,
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G_TYPE_NONE, 1, G_TYPE_UINT);
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}
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