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small optimization to curve rendering

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This commit is contained in:
Paul Davis 2014-01-03 14:05:05 -05:00
parent 4f465d37b3
commit 4b71d7fde5
1 changed files with 17 additions and 16 deletions
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33
libs/canvas/poly_item.cc
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@ -66,6 +66,10 @@ PolyItem::compute_bounding_box () const
void
PolyItem::render_path (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
{
if (_points.size() < 2) {
return;
}
Points::const_iterator i = _points.begin();
Duple c (item_to_window (Duple (i->x, i->y)));
@ -90,26 +94,23 @@ PolyItem::render_curve (Rect const & area, Cairo::RefPtr<Cairo::Context> context
Points::const_iterator cp1 = first_control_points.begin();
Points::const_iterator cp2 = second_control_points.begin();
Points::const_iterator p = _points.begin();
for (Points::const_iterator i = _points.begin(); i != _points.end(); ++i) {
Duple c = item_to_window (Duple (p->x, p->y));
context->move_to (c.x, c.y);
if (!done_first) {
while (p != _points.end()) {
Duple c = item_to_window (Duple (i->x, i->y));
context->move_to (c.x, c.y);
done_first = true;
Duple c1 = item_to_window (Duple (cp1->x, cp1->y));
Duple c2 = item_to_window (Duple (cp2->x, cp2->y));
} else {
Duple c1 = item_to_window (Duple (cp1->x, cp1->y));
Duple c2 = item_to_window (Duple (cp2->x, cp2->y));
Duple c3 = item_to_window (Duple (i->x, i->y));
context->curve_to (c1.x, c1.y, c2.x, c2.y, c3.x, c3.y);
cp1++;
cp2++;
}
c = item_to_window (Duple (p->x, p->y));
context->curve_to (c1.x, c1.y, c2.x, c2.y, c.x, c.y);
++cp1;
++cp2;
++p;
}
}