ardour/livetrax
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pixel-align canvas PolyItems with single-pixel outlines, for crispness

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This commit is contained in:
Paul Davis 2014-01-13 09:28:06 -05:00
parent d202fd9ad9
commit fbe94f4470
1 changed files with 11 additions and 4 deletions
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15
libs/canvas/poly_item.cc
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@ -72,13 +72,14 @@ PolyItem::render_path (Rect const & /* area */, Cairo::RefPtr<Cairo::Context> co
Points::const_iterator i = _points.begin();
Duple c (item_to_window (Duple (i->x, i->y)));
const double pixel_adjust = (_outline_width == 1.0 ? 0.5 : 0.0);
context->move_to (c.x, c.y);
context->move_to (c.x + pixel_adjust, c.y + pixel_adjust);
++i;
while (i != _points.end()) {
c = item_to_window (Duple (i->x, i->y));
context->line_to (c.x, c.y);
context->line_to (c.x + pixel_adjust, c.y + pixel_adjust);
++i;
}
}
@ -94,9 +95,10 @@ 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();
const double pixel_adjust = (_outline_width == 1.0 ? 0.5 : 0.0);
Duple c = item_to_window (Duple (p->x, p->y));
context->move_to (c.x, c.y);
context->move_to (c.x + pixel_adjust, c.y + pixel_adjust);
++p;
while (p != _points.end()) {
@ -106,7 +108,12 @@ PolyItem::render_curve (Rect const & area, Cairo::RefPtr<Cairo::Context> context
c = item_to_window (Duple (p->x, p->y));
context->curve_to (c1.x, c1.y, c2.x, c2.y, c.x, c.y);
context->curve_to (c1.x + pixel_adjust,
c1.y + pixel_adjust,
c2.x + pixel_adjust,
c2.y + pixel_adjust,
c.x + pixel_adjust,
c.y + pixel_adjust);
++cp1;
++cp2;