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settings: Manage our own font DPI

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Previously gnome-shell listened on the Xft Xsettings via GTK+s
GtkSettings to get the font DPI setting. The Xsetting might not
be what we want, and we should not rely on Xsettings when we don't need
to, so lets manage it ourself.

https://bugzilla.gnome.org/show_bug.cgi?id=765011
This commit is contained in:
Jonas Ådahl
2017-05-05 18:05:21 +08:00
parent a6ec2b1d42
commit 88cae8bd3d
3 changed files with 68 additions and 1 deletions
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66
src/backends/meta-settings.c
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@ -34,6 +34,7 @@ enum
{
UI_SCALING_FACTOR_CHANGED,
GLOBAL_SCALING_FACTOR_CHANGED,
FONT_DPI_CHANGED,
EXPERIMENTAL_FEATURES_CHANGED,
N_SIGNALS
@ -53,6 +54,8 @@ struct _MetaSettings
int ui_scaling_factor;
int global_scaling_factor;
int font_dpi;
MetaExperimentalFeature experimental_features;
gboolean experimental_features_overridden;
};
@ -198,6 +201,54 @@ meta_settings_get_global_scaling_factor (MetaSettings *settings,
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,
@ -208,6 +259,10 @@ interface_settings_changed (GSettings *interface_settings,
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
@ -340,6 +395,8 @@ meta_settings_init (MetaSettings *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);
@ -349,6 +406,7 @@ void
meta_settings_post_init (MetaSettings *settings)
{
update_ui_scaling_factor (settings);
update_font_dpi (settings);
}
static void
@ -374,6 +432,14 @@ meta_settings_class_init (MetaSettingsClass *klass)
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),