From 718c78a365e053afdc7974182453e1a069de598f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jonas=20=C3=85dahl?= <jadahl@gmail.com>
Date: Mon, 13 Jun 2022 23:01:15 +0200
Subject: [PATCH] kms: Add API to pass updates asynchronously

While doing this, rename the old synchronous functions to more clearly
communicate that they expect to actually process the update during the
call, not just post it.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2777>
---
 src/backends/native/meta-kms-device.c | 50 ++++++++++++++++++++++++---
 src/backends/native/meta-kms-device.h |  5 +++
 2 files changed, 51 insertions(+), 4 deletions(-)

diff --git a/src/backends/native/meta-kms-device.c b/src/backends/native/meta-kms-device.c
index b59c95dba..63aea26cd 100644
--- a/src/backends/native/meta-kms-device.c
+++ b/src/backends/native/meta-kms-device.c
@@ -289,9 +289,9 @@ typedef struct
 } PostUpdateData;
 
 static gpointer
-process_update_in_impl (MetaThreadImpl  *thread_impl,
-                        gpointer         user_data,
-                        GError         **error)
+process_sync_update_in_impl (MetaThreadImpl  *thread_impl,
+                             gpointer         user_data,
+                             GError         **error)
 {
   PostUpdateData *data = user_data;
   MetaKmsUpdate *update = data->update;
@@ -315,10 +315,52 @@ meta_kms_device_process_update_sync (MetaKmsDevice     *device,
     .update = update,
     .flags = flags,
   };
-  return meta_kms_run_impl_task_sync (kms, process_update_in_impl,
+  return meta_kms_run_impl_task_sync (kms, process_sync_update_in_impl,
                                       &data, NULL);
 }
 
+static gpointer
+process_async_update_in_impl (MetaThreadImpl  *thread_impl,
+                              gpointer         user_data,
+                              GError         **error)
+{
+  PostUpdateData *data = user_data;
+  MetaKmsUpdate *update = data->update;
+  MetaKmsDevice *device = meta_kms_update_get_device (update);
+  MetaKmsImplDevice *impl_device = meta_kms_device_get_impl_device (device);
+  MetaKmsFeedback *feedback;
+
+  feedback = meta_kms_impl_device_process_update (impl_device, update,
+                                                  data->flags);
+  meta_kms_feedback_unref (feedback);
+
+  return GINT_TO_POINTER (TRUE);
+}
+
+void
+meta_kms_device_post_update (MetaKmsDevice       *device,
+                             MetaKmsUpdate       *update,
+                             MetaKmsUpdateFlag    flags)
+{
+  MetaKms *kms = META_KMS (meta_kms_device_get_kms (device));
+  PostUpdateData *data;
+
+  g_return_if_fail (meta_kms_update_get_device (update) == device);
+
+  meta_kms_update_seal (update);
+
+  data = g_new0 (PostUpdateData, 1);
+  *data = (PostUpdateData) {
+    .update = update,
+    .flags = flags,
+  };
+
+  meta_thread_post_impl_task (META_THREAD (kms),
+                              process_async_update_in_impl,
+                              data, g_free,
+                              NULL, NULL);
+}
+
 void
 meta_kms_device_add_fake_plane_in_impl (MetaKmsDevice    *device,
                                         MetaKmsPlaneType  plane_type,
diff --git a/src/backends/native/meta-kms-device.h b/src/backends/native/meta-kms-device.h
index 3f400ceab..543c271a9 100644
--- a/src/backends/native/meta-kms-device.h
+++ b/src/backends/native/meta-kms-device.h
@@ -78,6 +78,11 @@ MetaKmsFeedback * meta_kms_device_process_update_sync (MetaKmsDevice     *device
                                                        MetaKmsUpdateFlag  flags)
   G_GNUC_WARN_UNUSED_RESULT;
 
+META_EXPORT_TEST
+void meta_kms_device_post_update (MetaKmsDevice     *device,
+                                  MetaKmsUpdate     *update,
+                                  MetaKmsUpdateFlag  flags);
+
 META_EXPORT_TEST
 void meta_kms_device_disable (MetaKmsDevice *device);