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paint-volume: Add a union method for boxes

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Creating PaintVolume instances is not possible, and it's not recommended
anyway. It is, though, necessary to union paint volumes, especially with
2D boxes, in some cases.

Clutter should provide a simple convenience function that allows
unioning volumes to boxes in a moderately efficient way.

https://bugzilla.gnome.org/show_bug.cgi?id=670021
This commit is contained in:
Emmanuele Bassi 2012-02-13 22:40:19 +00:00 committed by Emmanuele Bassi
parent 618e04e9cc
commit 6a09bf5b52
4 changed files with 40 additions and 0 deletions
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36
clutter/clutter-paint-volume.c
View File

@ -640,6 +640,42 @@ done:
pv->is_complete = FALSE;
}
/**
* clutter_paint_volume_union_box:
* @pv: a #ClutterPaintVolume
* @box: a #ClutterActorBox to union to @pv
*
* Unions the 2D region represented by @box to a #ClutterPaintVolume.
*
* This function is similar to clutter_paint_volume_union(), but it is
* specific for 2D regions.
*
* Since: 1.10
*/
void
clutter_paint_volume_union_box (ClutterPaintVolume *pv,
const ClutterActorBox *box)
{
ClutterPaintVolume volume;
ClutterVertex origin;
g_return_if_fail (pv != NULL);
g_return_if_fail (box != NULL);
_clutter_paint_volume_init_static (&volume, pv->actor);
origin.x = box->x1;
origin.y = box->y1;
origin.z = 0.f;
clutter_paint_volume_set_origin (&volume, &origin);
clutter_paint_volume_set_width (&volume, box->x2 - box->x1);
clutter_paint_volume_set_height (&volume, box->y2 - box->y1);
clutter_paint_volume_union (pv, &volume);
clutter_paint_volume_free (&volume);
}
/* The paint_volume setters only update vertices 0, 1, 3 and
* 4 since the others can be drived from them.
*

2
clutter/clutter-types.h
View File

@ -279,6 +279,8 @@ void clutter_paint_volume_set_depth (ClutterPaintVolume
gfloat clutter_paint_volume_get_depth (const ClutterPaintVolume *pv);
void clutter_paint_volume_union (ClutterPaintVolume *pv,
const ClutterPaintVolume *another_pv);
void clutter_paint_volume_union_box (ClutterPaintVolume *pv,
const ClutterActorBox *box);
gboolean clutter_paint_volume_set_from_allocation (ClutterPaintVolume *pv,
ClutterActor *actor);

1
clutter/clutter.symbols
View File

@ -900,6 +900,7 @@ clutter_paint_volume_set_from_allocation
clutter_paint_volume_set_height
clutter_paint_volume_set_origin
clutter_paint_volume_set_width
clutter_paint_volume_union_box
clutter_paint_volume_union
clutter_param_color_get_type
clutter_param_fixed_get_type

1
doc/reference/clutter/clutter-sections.txt
View File

@ -547,6 +547,7 @@ clutter_paint_volume_set_depth
clutter_paint_volume_get_depth
clutter_paint_volume_set_from_allocation
clutter_paint_volume_union
clutter_paint_volume_union_box
<SUBSECTION Standard>
CLUTTER_TYPE_GEOMETRY