ardour/livetrax
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slightly optimize bounding box computation for ArdourCanvas::PolyItem by avoiding inner conditional

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This commit is contained in:
Paul Davis 2014-03-07 11:24:51 -05:00
parent 170aee13eb
commit 621887cfaa
1 changed files with 14 additions and 13 deletions
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27
libs/canvas/poly_item.cc
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@ -37,27 +37,28 @@ PolyItem::PolyItem (Group* parent)
void
PolyItem::compute_bounding_box () const
{
bool have_one = false;
Rect bbox;
if (!_points.empty()) {
for (Points::const_iterator i = _points.begin(); i != _points.end(); ++i) {
if (have_one) {
Rect bbox;
Points::const_iterator i = _points.begin();
bbox.x0 = bbox.x1 = i->x;
bbox.y0 = bbox.y1 = i->y;
while (i != _points.end()) {
bbox.x0 = min (bbox.x0, i->x);
bbox.y0 = min (bbox.y0, i->y);
bbox.x1 = max (bbox.x1, i->x);
bbox.y1 = max (bbox.y1, i->y);
} else {
bbox.x0 = bbox.x1 = i->x;
bbox.y0 = bbox.y1 = i->y;
have_one = true;
++i;
}
}
if (!have_one) {
_bounding_box = boost::optional<Rect> ();
} else {
_bounding_box = bbox.expand (_outline_width / 2);
} else {
_bounding_box = boost::optional<Rect> ();
}
_bounding_box_dirty = false;