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backends: Don't include damage history in swap region

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Following the EGL_KHR_swap_buffers_with_damage specification, the
surface damage used by eglSwapBuffersWithDamage does not need to
contain the damage history.
Rework that to reduce the amount of rectangles that get passed to
the backend.

Also rework some of the regions that were using fb_clip_region and
missing the last scaling to support fractional scaling.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2089>
This commit is contained in:
Erico Nunes 2021-11-15 12:48:05 +01:00 committed by Marge Bot
parent 5f2779bfb6
commit a82dd68605
1 changed files with 30 additions and 19 deletions
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49
src/backends/meta-stage-impl.c
View File

@ -445,6 +445,8 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
gboolean has_buffer_age;
gboolean swap_with_damage;
cairo_region_t *redraw_clip;
cairo_region_t *redraw_clip_history;
cairo_region_t *redraw_clip_swap;
cairo_region_t *queued_redraw_clip = NULL;
cairo_region_t *fb_clip_region;
cairo_region_t *swap_region;
@ -567,20 +569,28 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
if (use_clipped_redraw)
{
/* Regenerate redraw_clip because:
* 1. It's missing the regions added from damage_history above; and
* 2. If using fractional scaling then it might be a fraction of a
* logical pixel (or one physical pixel) smaller than
* fb_clip_region, due to the clamping from
* offset_scale_and_clamp_region. So we need to ensure redraw_clip
* is a superset of fb_clip_region to avoid such gaps.
/* If using fractional scaling then the regions might be a fraction of
* a logical pixel (or one physical pixel) smaller than expected.
* So we need to regenerate them to avoid such gaps.
*/
cairo_region_destroy (redraw_clip);
redraw_clip = scale_offset_and_clamp_region (fb_clip_region,
1.0 / fb_scale,
view_rect.x,
view_rect.y);
redraw_clip_history = scale_offset_and_clamp_region (fb_clip_region,
1.0 / fb_scale,
view_rect.x,
view_rect.y);
redraw_clip_swap = scale_offset_and_clamp_region (redraw_clip,
1.0 / fb_scale,
view_rect.x,
view_rect.y);
}
else
{
redraw_clip_history = cairo_region_reference (fb_clip_region);
redraw_clip_swap = cairo_region_reference (redraw_clip);
}
g_clear_pointer (&redraw_clip, cairo_region_destroy);
g_clear_pointer (&fb_clip_region, cairo_region_destroy);
if (paint_debug_flags & CLUTTER_DEBUG_PAINT_DAMAGE_REGION)
{
@ -592,11 +602,11 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
}
else if (use_clipped_redraw)
{
queue_damage_region (stage_window, stage_view, fb_clip_region);
queue_damage_region (stage_window, stage_view, redraw_clip_history);
cogl_framebuffer_push_region_clip (fb, fb_clip_region);
cogl_framebuffer_push_region_clip (fb, redraw_clip_history);
paint_stage (stage_impl, stage_view, redraw_clip);
paint_stage (stage_impl, stage_view, redraw_clip_history);
cogl_framebuffer_pop_clip (fb);
}
@ -604,9 +614,11 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
{
meta_topic (META_DEBUG_BACKEND, "Unclipped stage paint");
paint_stage (stage_impl, stage_view, redraw_clip);
paint_stage (stage_impl, stage_view, redraw_clip_history);
}
cairo_region_destroy (redraw_clip_history);
/* XXX: It seems there will be a race here in that the stage
* window may be resized before the cogl_onscreen_swap_region
* is handled and so we may copy the wrong region. I can't
@ -616,12 +628,11 @@ meta_stage_impl_redraw_view_primary (MetaStageImpl *stage_impl,
* artefacts.
*/
if (use_clipped_redraw)
swap_region = cairo_region_reference (fb_clip_region);
swap_region = cairo_region_reference (redraw_clip_swap);
else
swap_region = cairo_region_create ();
g_clear_pointer (&redraw_clip, cairo_region_destroy);
g_clear_pointer (&fb_clip_region, cairo_region_destroy);
cairo_region_destroy (redraw_clip_swap);
COGL_TRACE_BEGIN_SCOPED (MetaStageImplRedrawViewSwapFramebuffer,
"Paint (swap framebuffer)");