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stage: implicitly clip to stage window bounds

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This implicitly intersects any clip for redrawing with the stage window
bounds. Without this we were sometimes trying to set huge off screen
scissors leading to undefined clipping results.

Reviewed-by: Emmanuele Bassi <ebassi@linux.intel.com>
This commit is contained in:
Robert Bragg 2011-09-19 12:54:31 +01:00
parent 662d12aeff
commit 239fc43c5f
1 changed files with 29 additions and 16 deletions
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45
clutter/clutter-stage.c
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@ -529,24 +529,23 @@ _clutter_stage_do_paint (ClutterStage *stage, const ClutterGeometry *clip)
{
ClutterStagePrivate *priv = stage->priv;
float clip_poly[8];
ClutterGeometry geom;
_clutter_stage_window_get_geometry (priv->impl, &geom);
if (clip)
{
clip_poly[0] = clip->x;
clip_poly[1] = clip->y;
clip_poly[2] = clip->x + clip->width;
clip_poly[3] = clip->y;
clip_poly[4] = clip->x + clip->width;
clip_poly[5] = clip->y + clip->height;
clip_poly[6] = clip->x;
clip_poly[7] = clip->y + clip->height;
clip_poly[0] = MAX (clip->x, 0);
clip_poly[1] = MAX (clip->y, 0);
clip_poly[2] = MIN (clip->x + clip->width, geom.width);
clip_poly[3] = clip_poly[1];
clip_poly[4] = clip_poly[2];
clip_poly[5] = MIN (clip->y + clip->height, geom.height);
clip_poly[6] = clip_poly[0];
clip_poly[7] = clip_poly[5];
}
else
{
ClutterGeometry geom;
_clutter_stage_window_get_geometry (priv->impl, &geom);
clip_poly[0] = 0;
clip_poly[1] = 0;
clip_poly[2] = geom.width;
@ -1118,6 +1117,8 @@ clutter_stage_real_queue_redraw (ClutterActor *actor,
ClutterGeometry stage_clip;
ClutterPaintVolume *redraw_clip;
ClutterActorBox bounding_box;
ClutterActorBox intersection_box;
ClutterGeometry geom;
if (CLUTTER_ACTOR_IN_DESTRUCTION (actor))
return;
@ -1151,12 +1152,24 @@ clutter_stage_real_queue_redraw (ClutterActor *actor,
stage,
&bounding_box);
_clutter_stage_window_get_geometry (stage_window, &geom);
intersection_box.x1 = MAX (bounding_box.x1, 0);
intersection_box.y1 = MAX (bounding_box.y1, 0);
intersection_box.x2 = MIN (bounding_box.x2, geom.width);
intersection_box.y2 = MIN (bounding_box.y2, geom.height);
/* There is no need to track degenerate/empty redraw clips */
if (intersection_box.x2 <= intersection_box.x1 ||
intersection_box.y2 <= intersection_box.y1)
return;
/* when converting to integer coordinates make sure we round the edges of the
* clip rectangle outwards... */
stage_clip.x = bounding_box.x1;
stage_clip.y = bounding_box.y1;
stage_clip.width = bounding_box.x2 - stage_clip.x;
stage_clip.height = bounding_box.y2 - stage_clip.y;
stage_clip.x = intersection_box.x1;
stage_clip.y = intersection_box.y1;
stage_clip.width = intersection_box.x2 - stage_clip.x;
stage_clip.height = intersection_box.y2 - stage_clip.y;
_clutter_stage_window_add_redraw_clip (stage_window, &stage_clip);
}