color-manager: Maintain a lcms context

Will be used from other color related units later on. This also adds an
explicit dependency on LCMS2.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2164>

meson.build

@@ -13,6 +13,7 @@ mutter_srcdir = meson.current_source_dir()
 mutter_builddir = meson.current_build_dir()
 
 # generic version requirements
+lcms2_req = '>= 2.6'
 colord_req = '>= 1.4.5'
 fribidi_req = '>= 1.0.0'
 glib_req = '>= 2.69.0'
@@ -126,6 +127,7 @@ atk_dep = dependency('atk', version: atk_req)
 libcanberra_dep = dependency('libcanberra', version: libcanberra_req)
 dbus_dep = dependency('dbus-1')
 colord_dep = dependency('colord', version: colord_req)
+lcms2_dep = dependency('lcms2', version: lcms2_req)
 
 have_wayland = get_option('wayland')
 # For now always require X11 support

src/backends/meta-color-manager-private.h

@@ -19,6 +19,7 @@
 #define META_COLOR_MANAGER_PRIVATE_H
 
 #include <colord.h>
+#include <lcms2.h>
 
 #include "backends/meta-color-manager.h"
 
@@ -35,4 +36,6 @@ gboolean meta_color_manager_is_ready (MetaColorManager *color_manager);
 META_EXPORT_TEST
 int meta_color_manager_get_num_color_devices (MetaColorManager *color_manager);
 
+cmsContext meta_color_manager_get_lcms_context (MetaColorManager *color_manager);
+
 #endif /* META_COLOR_MANAGER_PRIVATE_H */

src/backends/meta-color-manager.c

@@ -68,6 +68,8 @@ typedef struct _MetaColorManagerPrivate
 {
   MetaBackend *backend;
 
+  cmsContext lcms_context;
+
   CdClient *cd_client;
   GCancellable *cancellable;
 
@@ -243,6 +245,8 @@ meta_color_manager_constructed (GObject *object)
   MetaColorManagerPrivate *priv =
     meta_color_manager_get_instance_private (color_manager);
 
+  priv->lcms_context = cmsCreateContext (NULL, NULL);
+
   priv->cancellable = g_cancellable_new ();
 
   priv->cd_client = cd_client_new ();
@@ -270,6 +274,7 @@ meta_color_manager_finalize (GObject *object)
   g_clear_object (&priv->cancellable);
   g_clear_pointer (&priv->devices, g_hash_table_unref);
   g_clear_object (&priv->gsd_color);
+  g_clear_pointer (&priv->lcms_context, cmsDeleteContext);
 
   G_OBJECT_CLASS (meta_color_manager_parent_class)->finalize (object);
 }
@@ -389,3 +394,12 @@ meta_color_manager_get_num_color_devices (MetaColorManager *color_manager)
 
   return g_hash_table_size (priv->devices);
 }
+
+cmsContext
+meta_color_manager_get_lcms_context (MetaColorManager *color_manager)
+{
+  MetaColorManagerPrivate *priv =
+    meta_color_manager_get_instance_private (color_manager);
+
+  return priv->lcms_context;
+}

src/meson.build

@@ -23,6 +23,7 @@ mutter_pkg_deps = [
 
 mutter_pkg_private_deps = [
   colord_dep,
+  lcms2_dep,
   gmodule_no_export_dep,
   gnome_settings_daemon_dep,
   json_glib_dep,