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st-private: Scale shadows accordingly to actor resource scaling

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Use scaled offscreen framebuffer to paint shadows so that it will match the
scaling applied to the actual actor.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/5
https://bugzilla.gnome.org/show_bug.cgi?id=765011
This commit is contained in:
Marco Trevisan (Treviño) 2017-09-02 04:08:55 +02:00 committed by Jonas Ådahl
parent 03c4628cad
commit 0bcf76970a
1 changed files with 8 additions and 0 deletions
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8
src/st/st-private.c
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@ -431,6 +431,7 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
{
ClutterContent *image = NULL;
CoglPipeline *shadow_pipeline = NULL;
float resource_scale;
float width, height;
g_return_val_if_fail (clutter_actor_has_allocation (actor), NULL);
@ -440,6 +441,12 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
if (width == 0 || height == 0)
return NULL;
if (!clutter_actor_get_resource_scale (actor, &resource_scale))
return NULL;
width *= resource_scale;
height *= resource_scale;
image = clutter_actor_get_content (actor);
if (image && CLUTTER_IS_IMAGE (image))
{
@ -491,6 +498,7 @@ _st_create_shadow_pipeline_from_actor (StShadow *shadow_spec,
cogl_framebuffer_clear (fb, COGL_BUFFER_BIT_COLOR, &clear_color);
cogl_framebuffer_translate (fb, -x, -y, 0);
cogl_framebuffer_orthographic (fb, 0, 0, width, height, 0, 1.0);
cogl_framebuffer_scale (fb, resource_scale, resource_scale, 1);
clutter_actor_set_opacity_override (actor, 255);
clutter_actor_paint (actor);