d3dvideosink: Avoid frame rendering while the window is completely hidden

https://bugzilla.gnome.org/show_bug.cgi?id=749856

diff --git a/sys/d3dvideosink/d3dhelpers.c b/sys/d3dvideosink/d3dhelpers.c
index 28815d6..4030cd6 100644 (file)
--- a/sys/d3dvideosink/d3dhelpers.c
+++ b/sys/d3dvideosink/d3dhelpers.c
@@ -28,6 +28,14 @@
 
 #include <stdio.h>
 
+typedef enum
+{
+  WINDOW_VISIBILITY_FULL = 1,
+  WINDOW_VISIBILITY_PARTIAL = 2,
+  WINDOW_VISIBILITY_HIDDEN = 3,
+  WINDOW_VISIBILITY_ERROR = 4
+} WindowHandleVisibility;
+
 /** FWD DECLS **/
 
 static gboolean d3d_hidden_window_thread (GstD3DVideoSinkClass * klass);
@@ -1823,6 +1831,12 @@ end:
 GstFlowReturn
 d3d_render_buffer (GstD3DVideoSink * sink, GstBuffer * buf)
 {
+  WindowHandleVisibility handle_visibility = WINDOW_VISIBILITY_ERROR;
+  int clip_ret;
+  HDC handle_hdc;
+  RECT handle_rectangle;
+  RECT clip_rectangle;
+
   GstFlowReturn ret = GST_FLOW_OK;
   GstMemory *mem;
   LPDIRECT3DSURFACE9 surface = NULL;
@@ -1845,6 +1859,36 @@ d3d_render_buffer (GstD3DVideoSink * sink, GstBuffer * buf)
     goto end;
   }
 
+  /* check for window handle visibility, if hidden skip frame rendering  */
+
+  handle_hdc = GetDC (sink->d3d.window_handle);
+  GetClientRect (sink->d3d.window_handle, &handle_rectangle);
+  clip_ret = GetClipBox (handle_hdc, &clip_rectangle);
+  ReleaseDC (sink->d3d.window_handle, handle_hdc);
+
+  switch (clip_ret) {
+    case NULLREGION:
+      handle_visibility = WINDOW_VISIBILITY_HIDDEN;
+      break;
+    case SIMPLEREGION:
+      if (EqualRect (&clip_rectangle, &handle_rectangle))
+        handle_visibility = WINDOW_VISIBILITY_FULL;
+      else
+        handle_visibility = WINDOW_VISIBILITY_PARTIAL;
+      break;
+    case COMPLEXREGION:
+      handle_visibility = WINDOW_VISIBILITY_PARTIAL;
+      break;
+    default:
+      handle_visibility = WINDOW_VISIBILITY_ERROR;
+      break;
+  }
+
+  if (handle_visibility == WINDOW_VISIBILITY_HIDDEN) {
+    GST_DEBUG_OBJECT (sink, "Hidden hwnd, skipping frame rendering...");
+    goto end;
+  }
+
   GST_INFO_OBJECT (sink, "%s %" GST_TIME_FORMAT,
       (sink->d3d.window_handle != NULL) ? "Render" : "No Win",
       GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));