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st: Report correct paint volumes during transitions

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StWidget reports a paint volume large enough to paint the current
theme node. As CSS transitions also paint the previous theme node,
the reported paint volume may be incorrect, resulting in screen
artifacts when painting outside the reported volume.

Add st_theme_node_transition_get_paint_box() to calculate an allocation
large enough to paint both theme nodes, and use it to report the correct
paint volume during transitions.

https://bugzilla.gnome.org/show_bug.cgi?id=640085
This commit is contained in:
Florian Müllner
2011-01-20 21:15:05 +01:00
parent 00ba937171
commit 289d577bc1
3 changed files with 33 additions and 9 deletions
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28
src/st/st-theme-node-transition.c
View File

@ -182,6 +182,22 @@ st_theme_node_transition_update (StThemeNodeTransition *transition,
static void
calculate_offscreen_box (StThemeNodeTransition *transition,
const ClutterActorBox *allocation)
{
ClutterActorBox paint_box;
st_theme_node_transition_get_paint_box (transition,
allocation,
&paint_box);
transition->priv->offscreen_box.x1 = paint_box.x1 - allocation->x1;
transition->priv->offscreen_box.y1 = paint_box.y1 - allocation->y1;
transition->priv->offscreen_box.x2 = paint_box.x2 - allocation->x1;
transition->priv->offscreen_box.y2 = paint_box.y2 - allocation->y1;
}
void
st_theme_node_transition_get_paint_box (StThemeNodeTransition *transition,
const ClutterActorBox *allocation,
ClutterActorBox *paint_box)
{
StThemeNodeTransitionPrivate *priv = transition->priv;
ClutterActorBox old_node_box, new_node_box;
@ -194,14 +210,10 @@ calculate_offscreen_box (StThemeNodeTransition *transition,
allocation,
&new_node_box);
priv->offscreen_box.x1 = MIN (old_node_box.x1, new_node_box.x1)
- allocation->x1;
priv->offscreen_box.y1 = MIN (old_node_box.y1, new_node_box.y1)
- allocation->y1;
priv->offscreen_box.x2 = MAX (old_node_box.x2, new_node_box.x2)
- allocation->x1;
priv->offscreen_box.y2 = MAX (old_node_box.y2, new_node_box.y2)
- allocation->y1;
paint_box->x1 = MIN (old_node_box.x1, new_node_box.x1);
paint_box->y1 = MIN (old_node_box.y1, new_node_box.y1);
paint_box->x2 = MAX (old_node_box.x2, new_node_box.x2);
paint_box->y2 = MAX (old_node_box.y2, new_node_box.y2);
}
static gboolean