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st: Do not force allocation updates during shadow creation

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If an actor is pending a relayout when get_allocation_box() is called,
the method forces an allocation update. In case of StWidget, this might
then result in a style update and a consecutive invalidation of the
shadow spec.

A helper method that invalidates one of its parameters as a side effect
(and by extension its return value as well) is most unexpected, so cur-
rently _st_create_shadow_pipeline_from_actor() poses an easy trap to
callers to run into.

Remove that trap by calling get_size()/get_position() instead, which
don't have the unintended side effect - it is still a good idea to fix
callers who were running into this to not waste resources on creating
shadows that are invalidated before the next paint, but throwing un-
defined behavior at them is harsh ...

https://bugzilla.gnome.org/show_bug.cgi?id=788908
This commit is contained in:
Florian Müllner 2018-02-23 17:29:54 +01:00 committed by Florian Müllner
parent 9f7b101437
commit f6a08472a0
1 changed files with 4 additions and 4 deletions
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8
src/st/st-private.c
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@ -414,11 +414,9 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
ClutterActor *actor)
{
CoglPipeline *shadow_pipeline = NULL;
ClutterActorBox box;
float width, height;
clutter_actor_get_allocation_box (actor, &box);
clutter_actor_box_get_size (&box, &width, &height);
clutter_actor_get_size (actor, &width, &height);
if (width == 0 || height == 0)
return NULL;
@ -441,6 +439,7 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
CoglFramebuffer *fb;
CoglColor clear_color;
CoglError *catch_error = NULL;
float x, y;
buffer = cogl_texture_new_with_size (width,
height,
@ -462,6 +461,7 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
}
cogl_color_init_from_4ub (&clear_color, 0, 0, 0, 0);
clutter_actor_get_position (actor, &x, &y);
/* XXX: There's no way to render a ClutterActor to an offscreen
* as it uses the implicit API. */
@ -470,7 +470,7 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
G_GNUC_END_IGNORE_DEPRECATIONS;
cogl_framebuffer_clear (fb, COGL_BUFFER_BIT_COLOR, &clear_color);
cogl_framebuffer_translate (fb, -box.x1, -box.y1, 0);
cogl_framebuffer_translate (fb, -x, -y, 0);
cogl_framebuffer_orthographic (fb, 0, 0, width, height, 0, 1.0);
clutter_actor_set_opacity_override (actor, 255);