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clutter/offscreen-effect: Clear offscreen when pre-paint fails

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Some ClutterOffscreenEffect subclasses, such as ClutterBrightnessContrastEffect,
early-return FALSE in pre-paint before chaining up. It's an important optimization
that avoids creating or updating the offscreen framebuffer.

However, if an offscreen framebuffer already exists by the time pre-paint fails,
it will be used *without* repaint the actor over it. That causes an old picture
of the actor to be displayed.

Fix that by always clearing the offscreen framebuffer when pre-paint fails.

Fixes https://gitlab.gnome.org/GNOME/mutter/issues/810

https://gitlab.gnome.org/GNOME/mutter/merge_requests/992

(cherry picked from commit 64685f4b20)
This commit is contained in:
Georges Basile Stavracas Neto 2020-01-07 13:17:56 -03:00 committed by Robert Mader
parent 47fe7ac25b
commit aea5541ffa
1 changed files with 11 additions and 4 deletions
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15
clutter/clutter/clutter-offscreen-effect.c
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@ -458,10 +458,17 @@ clutter_offscreen_effect_paint (ClutterEffect *effect,
*/
if (priv->offscreen == NULL || (flags & CLUTTER_EFFECT_PAINT_ACTOR_DIRTY))
{
/* Chain up to the parent paint method which will call the pre and
post paint functions to update the image */
CLUTTER_EFFECT_CLASS (clutter_offscreen_effect_parent_class)->
paint (effect, flags);
ClutterEffectClass *effect_class = CLUTTER_EFFECT_GET_CLASS (effect);
gboolean pre_paint_succeeded;
pre_paint_succeeded = effect_class->pre_paint (effect);
clutter_actor_continue_paint (priv->actor);
if (pre_paint_succeeded)
effect_class->post_paint (effect);
else
g_clear_pointer (&priv->offscreen, cogl_object_unref);
}
else
clutter_offscreen_effect_paint_texture (self);