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screen-cast/area-src: Add before-paint watch to catch scanouts

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Scanouts are taken away after painting. However, when we're
streaming, what we actually want is to capture whatever is
going to end up on screen - and that includes the scanout
if there's any.

Add a before-paint watch that only records new frames if a
scanout is set.

Inspired by (and commit log mostly copied from) e6a13e5d57
("monitor-stream-src: Add before-paint watch to catch scanouts").

v2:
* Do not call stage_painted from before_stage_painted (Georges Basile
  Stavracas Neto)

Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/1707
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1902>
This commit is contained in:
Michel Dänzer 2021-06-25 12:54:46 +02:00 committed by Marge Bot
parent 7bcbf6d5c7
commit 8de0771aad
1 changed files with 27 additions and 0 deletions
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27
src/backends/meta-screen-cast-area-stream-src.c
View File

@ -231,6 +231,25 @@ maybe_record_frame_on_idle (gpointer user_data)
return G_SOURCE_REMOVE;
}
static void
before_stage_painted (MetaStage *stage,
ClutterStageView *view,
ClutterPaintContext *paint_context,
gpointer user_data)
{
MetaScreenCastAreaStreamSrc *area_src =
META_SCREEN_CAST_AREA_STREAM_SRC (user_data);
MetaScreenCastStreamSrc *src = META_SCREEN_CAST_STREAM_SRC (area_src);
if (area_src->maybe_record_idle_id)
return;
if (!clutter_stage_view_peek_scanout (view))
return;
area_src->maybe_record_idle_id = g_idle_add (maybe_record_frame_on_idle, src);
}
static void
stage_painted (MetaStage *stage,
ClutterStageView *view,
@ -293,6 +312,14 @@ add_view_painted_watches (MetaScreenCastAreaStreamSrc *area_src)
{
MetaStageWatch *watch;
watch = meta_stage_watch_view (meta_stage,
CLUTTER_STAGE_VIEW (view),
META_STAGE_WATCH_BEFORE_PAINT,
before_stage_painted,
area_src);
area_src->watches = g_list_prepend (area_src->watches, watch);
watch = meta_stage_watch_view (meta_stage,
CLUTTER_STAGE_VIEW (view),
META_STAGE_WATCH_AFTER_ACTOR_PAINT,