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stage-impl: Do clipped redraws when drawing offscreen

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This change allows clipped redraws for offscreen. The net
effect of this change is to preserve the original redraw clip when
possible (rather than overwriting it with the full view redraw) in
the paint context.

This eventually helps in retrieving the fine grained updated regions of
the frame since last redraw and sending it to the pipewire client
(as shown in a subsquent CL).

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2775>
This commit is contained in:
Salman 2022-12-20 19:31:08 +00:00 committed by Marge Bot
parent ab36baa9b1
commit 43cee4b6b6
1 changed files with 51 additions and 21 deletions
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72
src/backends/meta-stage-impl.c
View file

@ -454,6 +454,46 @@ transform_swap_region_to_onscreen (ClutterStageView *stage_view,
return transformed_region;
}
static gboolean
should_use_clipped_redraw (gboolean is_full_redraw,
gboolean has_buffer_age,
gboolean buffer_has_valid_damage_history,
ClutterDrawDebugFlag paint_debug_flags,
CoglFramebuffer *framebuffer,
ClutterStageWindow *stage_window)
{
gboolean can_blit_sub_buffer;
gboolean can_use_clipped_redraw;
gboolean is_warmed_up;
if (is_full_redraw)
return FALSE;
if (paint_debug_flags & CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS)
return FALSE;
if (COGL_IS_OFFSCREEN (framebuffer))
return TRUE;
if (!buffer_has_valid_damage_history)
{
meta_topic (META_DEBUG_BACKEND,
"Invalid back buffer age: forcing full redraw");
return FALSE;
}
can_blit_sub_buffer =
cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION);
can_use_clipped_redraw =
_clutter_stage_window_can_clip_redraws (stage_window) &&
(can_blit_sub_buffer || has_buffer_age);
/* Some drivers struggle to get going and produce some junk
* frames when starting up... */
is_warmed_up =
cogl_onscreen_get_frame_counter (COGL_ONSCREEN (framebuffer)) > 3;
return is_warmed_up && can_use_clipped_redraw;
}
static void
meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
ClutterStageView *stage_view,
@ -465,8 +505,8 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
CoglFramebuffer *onscreen = clutter_stage_view_get_onscreen (stage_view);
cairo_rectangle_int_t view_rect;
gboolean is_full_redraw;
gboolean use_clipped_redraw = TRUE;
gboolean can_blit_sub_buffer;
gboolean use_clipped_redraw;
gboolean buffer_has_valid_damage_history = FALSE;
gboolean has_buffer_age;
gboolean swap_with_damage;
cairo_region_t *redraw_clip;
@ -484,10 +524,6 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
fb_width = cogl_framebuffer_get_width (fb);
fb_height = cogl_framebuffer_get_height (fb);
can_blit_sub_buffer =
COGL_IS_ONSCREEN (onscreen) &&
cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_SWAP_REGION);
has_buffer_age =
COGL_IS_ONSCREEN (onscreen) &&
cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE);
@ -505,26 +541,20 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
if (has_buffer_age)
{
buffer_age = cogl_onscreen_get_buffer_age (COGL_ONSCREEN (onscreen));
if (!clutter_damage_history_is_age_valid (damage_history, buffer_age))
{
meta_topic (META_DEBUG_BACKEND,
"Invalid back buffer(age=%d): forcing full redraw",
buffer_age);
use_clipped_redraw = FALSE;
}
buffer_has_valid_damage_history =
clutter_damage_history_is_age_valid (damage_history,
buffer_age);
}
meta_get_clutter_debug_flags (NULL, &paint_debug_flags, NULL);
use_clipped_redraw =
use_clipped_redraw &&
!(paint_debug_flags & CLUTTER_DEBUG_DISABLE_CLIPPED_REDRAWS) &&
_clutter_stage_window_can_clip_redraws (stage_window) &&
(can_blit_sub_buffer || has_buffer_age) &&
!is_full_redraw &&
/* some drivers struggle to get going and produce some junk
* frames when starting up... */
cogl_onscreen_get_frame_counter (COGL_ONSCREEN (onscreen)) > 3;
should_use_clipped_redraw (is_full_redraw,
has_buffer_age,
buffer_has_valid_damage_history,
paint_debug_flags,
onscreen,
stage_window);
if (use_clipped_redraw)
{