[gnome-remote-desktop] rdp-surface: Create CUDA damage detector, if CUDA is available

[Jonas Ådahl <jadahl src gnome org>]

commit 630626ca319780ba7b5f9b4a92d6c7d631036092
Author: Pascal Nowack <Pascal Nowack gmx de>
Date:   Fri Jan 7 12:29:38 2022 +0100

    rdp-surface: Create CUDA damage detector, if CUDA is available
    
    With this in place, the damage detection now runs on the GPU, thus
    saving time, and therefore reducing frame latency by several
    milliseconds.

 src/grd-rdp-surface.c | 43 ++++++++++++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 9 deletions(-)
---
diff --git a/src/grd-rdp-surface.c b/src/grd-rdp-surface.c
index 2c2f753d..cb1851f6 100644
--- a/src/grd-rdp-surface.c
+++ b/src/grd-rdp-surface.c
@@ -22,9 +22,20 @@
 #include "grd-rdp-surface.h"
 
 #include "grd-hwaccel-nvidia.h"
-#include "grd-rdp-buffer.h"
+#include "grd-rdp-damage-detector-cuda.h"
 #include "grd-rdp-damage-detector-memcmp.h"
 
+static void
+destroy_hwaccel_util_objects (GrdRdpSurface *rdp_surface)
+{
+  if (rdp_surface->cuda_stream)
+    {
+      grd_hwaccel_nvidia_destroy_cuda_stream (rdp_surface->hwaccel_nvidia,
+                                              rdp_surface->cuda_stream);
+      rdp_surface->cuda_stream = NULL;
+    }
+}
+
 GrdRdpSurface *
 grd_rdp_surface_new (GrdHwAccelNvidia *hwaccel_nvidia)
 {
@@ -38,8 +49,27 @@ grd_rdp_surface_new (GrdHwAccelNvidia *hwaccel_nvidia)
                                               &rdp_surface->cuda_stream))
     return NULL;
 
-  rdp_surface->detector = (GrdRdpDamageDetector *)
-    grd_rdp_damage_detector_memcmp_new ();
+  if (hwaccel_nvidia)
+    {
+      GrdRdpDamageDetectorCuda *detector;
+
+      detector = grd_rdp_damage_detector_cuda_new (hwaccel_nvidia,
+                                                   rdp_surface->cuda_stream);
+      if (!detector)
+        {
+          destroy_hwaccel_util_objects (rdp_surface);
+          return NULL;
+        }
+
+      rdp_surface->detector = GRD_RDP_DAMAGE_DETECTOR (detector);
+    }
+  else
+    {
+      GrdRdpDamageDetectorMemcmp *detector;
+
+      detector = grd_rdp_damage_detector_memcmp_new ();
+      rdp_surface->detector = GRD_RDP_DAMAGE_DETECTOR (detector);
+    }
 
   g_mutex_init (&rdp_surface->surface_mutex);
 
@@ -57,12 +87,7 @@ grd_rdp_surface_free (GrdRdpSurface *rdp_surface)
   g_mutex_clear (&rdp_surface->surface_mutex);
 
   g_clear_object (&rdp_surface->detector);
-  if (rdp_surface->cuda_stream)
-    {
-      grd_hwaccel_nvidia_destroy_cuda_stream (rdp_surface->hwaccel_nvidia,
-                                              rdp_surface->cuda_stream);
-      rdp_surface->cuda_stream = NULL;
-    }
+  destroy_hwaccel_util_objects (rdp_surface);
 
   g_free (rdp_surface);
 }