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clutter/stage-cogl: Warn if the fb_clip_region is empty

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Since a NULL redraw_clip means that a full view redraw should be done
and an empty redraw clip may never be set (see the width/height checks
in clutter_stage_view_add_redraw_clip()), the fb_clip_region should
always be set to a reasonable region that's either the whole view or
individual regions inside the view.

So make sure that's actually the case by warning and that the
fb_clip_region isn't empty, which allows dropping another few lines of
code.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1113
This commit is contained in:
Jonas Dreßler 2020-03-06 12:35:27 +01:00 committed by Jonas Ådahl
parent 08f47fee16
commit 066e78c9b3
1 changed files with 29 additions and 58 deletions
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37
clutter/clutter/cogl/clutter-stage-cogl.c
View File

@ -578,16 +578,15 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
gboolean use_clipped_redraw;
gboolean can_blit_sub_buffer;
gboolean has_buffer_age;
gboolean do_swap_buffer;
gboolean swap_with_damage;
cairo_region_t *redraw_clip;
cairo_region_t *queued_redraw_clip = NULL;
cairo_region_t *fb_clip_region;
cairo_region_t *swap_region;
gboolean clip_region_empty;
float fb_scale;
int fb_width, fb_height;
int buffer_age;
gboolean res;
clutter_stage_view_get_layout (view, &view_rect);
fb_scale = clutter_stage_view_get_scale (view);
@ -653,13 +652,12 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
redraw_clip = cairo_region_create_rectangle (&view_rect);
}
clip_region_empty = (use_clipped_redraw &&
cairo_region_is_empty (fb_clip_region));
g_return_val_if_fail (!cairo_region_is_empty (fb_clip_region), FALSE);
swap_with_damage = FALSE;
if (has_buffer_age)
{
if (use_clipped_redraw && !clip_region_empty)
if (use_clipped_redraw)
{
cairo_region_t *fb_damage;
cairo_region_t *view_damage;
@ -713,11 +711,7 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
}
}
if (use_clipped_redraw && clip_region_empty)
{
CLUTTER_NOTE (CLIPPING, "Empty stage output paint\n");
}
else if (use_clipped_redraw)
if (use_clipped_redraw)
{
cogl_framebuffer_push_region_clip (fb, fb_clip_region);
@ -741,30 +735,13 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
* artefacts.
*/
if (use_clipped_redraw)
{
if (clip_region_empty)
{
do_swap_buffer = FALSE;
}
else
{
swap_region = cairo_region_copy (fb_clip_region);
do_swap_buffer = TRUE;
}
}
else
{
swap_region = cairo_region_create ();
do_swap_buffer = TRUE;
}
g_clear_pointer (&redraw_clip, cairo_region_destroy);
g_clear_pointer (&fb_clip_region, cairo_region_destroy);
if (do_swap_buffer)
{
gboolean res;
COGL_TRACE_BEGIN_SCOPED (ClutterStageCoglRedrawViewSwapFramebuffer,
"Paint (swap framebuffer)");
@ -795,12 +772,6 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
return res;
}
else
{
g_clear_pointer (&queued_redraw_clip, cairo_region_destroy);
return FALSE;
}
}
static void
clutter_stage_cogl_scanout_view (ClutterStageCogl *stage_cogl,