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color-manager: Keep track of temperature

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It will be used to generate gamma look up tables depending on
temperature.

The temperature comes from org.gnome.SettingsDaemon.Color and
depends on the current night light state.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2165>
This commit is contained in:
Jonas Ådahl 2021-12-04 00:31:43 +01:00
parent b3fa4a6cd8
commit 16149d7c25
1 changed files with 34 additions and 0 deletions
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34
src/backends/meta-color-manager.c
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@ -55,6 +55,8 @@
#include "meta-dbus-gsd-color.h"
#include "meta-dbus-gsd-power-screen.h"
#define DEFAULT_TEMPERATURE 6500 /* Kelvin */
enum
{
PROP_0,
@ -83,6 +85,11 @@ typedef struct _MetaColorManagerPrivate
MetaDbusSettingsDaemonPowerScreen *gsd_power_screen;
gboolean is_ready;
/* The temperature (in Kelvin) adjustment to apply to the color LUTs;
* used to shift the screen towards red for Night Light.
*/
unsigned int temperature;
} MetaColorManagerPrivate;
G_DEFINE_TYPE_WITH_PRIVATE (MetaColorManager, meta_color_manager, G_TYPE_OBJECT)
@ -218,6 +225,28 @@ cd_client_connect_cb (GObject *source_object,
priv->is_ready = TRUE;
}
static void
on_temperature_changed (MetaDbusSettingsDaemonColor *gsd_color,
GParamSpec *pspec,
MetaColorManager *color_manager)
{
MetaColorManagerPrivate *priv =
meta_color_manager_get_instance_private (color_manager);
unsigned int temperature;
temperature = meta_dbus_settings_daemon_color_get_temperature (gsd_color);
if (priv->temperature == temperature)
return;
if (temperature < 1000 || temperature > 10000)
{
g_warning ("Invalid temperature from gsd-color: %u K", temperature);
return;
}
priv->temperature = temperature;
}
static void
on_gsd_color_ready (GObject *source_object,
GAsyncResult *res,
@ -243,6 +272,10 @@ on_gsd_color_ready (GObject *source_object,
meta_topic (META_DEBUG_COLOR,
"Connection to org.gnome.SettingsDaemon.Color established");
priv->gsd_color = gsd_color;
g_signal_connect (gsd_color, "notify::temperature",
G_CALLBACK (on_temperature_changed),
color_manager);
}
static void
@ -283,6 +316,7 @@ meta_color_manager_constructed (GObject *object)
priv->lcms_context = cmsCreateContext (NULL, NULL);
priv->cancellable = g_cancellable_new ();
priv->temperature = DEFAULT_TEMPERATURE;
priv->cd_client = cd_client_new ();
cd_client_connect (priv->cd_client, priv->cancellable, cd_client_connect_cb,