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offscreen-effect: Use the paint box to size the FBO

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We should be using the real, on-screen, transformed size of the actor to
size and position the offscreen buffer we use to paint the actor for an
effect.
This commit is contained in:
Emmanuele Bassi 2010-08-19 14:05:45 +01:00 committed by Robert Bragg
parent 25abdf09b7
commit 5d97ca5f87
1 changed files with 19 additions and 26 deletions
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45
clutter/clutter-offscreen-effect.c
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@ -153,7 +153,13 @@ update_fbo (ClutterEffect *effect)
* FIXME - this is actually not enough: we need the paint area
* to make this work reliably
*/
clutter_actor_get_transformed_size (priv->actor, &width, &height);
{
ClutterActorBox box = { 0, };
clutter_actor_get_paint_box (priv->actor, &box);
clutter_actor_box_get_size (&box, &width, &height);
}
if (priv->target_width == width &&
priv->target_height == height)
return TRUE;
@ -202,36 +208,23 @@ get_screen_offsets (ClutterActor *actor,
gfloat *x_offset,
gfloat *y_offset)
{
ClutterVertex verts[4];
gfloat x_min = G_MAXFLOAT, y_min = G_MAXFLOAT;
gfloat v[4] = { 0, };
gint i;
/* Get the actors allocation transformed into screen coordinates.
*
* XXX: Note: this may not be a bounding box for the actor, since an
* actor with depth may escape the box due to its perspective
* projection. */
clutter_actor_get_abs_allocation_vertices (actor, verts);
for (i = 0; i < G_N_ELEMENTS (verts); ++i)
if (CLUTTER_ACTOR_IS_TOPLEVEL (actor))
{
if (verts[i].x < x_min)
x_min = verts[i].x;
if (verts[i].y < y_min)
y_min = verts[i].y;
/* trivial optimization: a top-level actor is always going to
* have a (0, 0) offset
*/
*x_offset = 0.0f;
*y_offset = 0.0f;
}
else
{
ClutterActorBox box = { 0, };
/* XXX: It's not good enough to round by simply truncating the fraction here
* via a cast, as it results in offscreen rendering being offset by 1 pixel
* in many cases... */
#define ROUND(x) ((x) >= 0 ? (long)((x) + 0.5) : (long)((x) - 0.5))
*x_offset = ROUND (x_min);
*y_offset = ROUND (y_min);
#undef ROUND
clutter_actor_get_paint_box (actor, &box);
clutter_actor_box_get_origin (&box, x_offset, y_offset);
}
/* since we're setting up a viewport with a negative offset to paint
* in an FBO with the same modelview and projection matrices as the