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canvas items must be able to use fractional positions when rendering.

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This is required to be able to draw precise single pixel lines, as described
in the Cairo FAQ
This commit is contained in:
Paul Davis
2015-02-09 16:40:10 -05:00
parent ef79d1c4d4
commit 736038556f
2 changed files with 9 additions and 7 deletions
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2
libs/canvas/canvas/item.h
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@@ -154,7 +154,7 @@ public:
Duple item_to_window (Duple const&, bool rounded = true) const;
Duple window_to_item (Duple const&) const;
Rect item_to_window (Rect const&) const;
Rect item_to_window (Rect const&, bool rounded = true) const;
Rect window_to_item (Rect const&) const;
void raise_to_top ();

14
libs/canvas/item.cc
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@@ -231,14 +231,16 @@ Item::window_to_item (ArdourCanvas::Duple const & d) const
}
ArdourCanvas::Rect
Item::item_to_window (ArdourCanvas::Rect const & r) const
Item::item_to_window (ArdourCanvas::Rect const & r, bool rounded) const
{
Rect ret = item_to_canvas (r).translate (-scroll_offset());
ret.x0 = round (ret.x0);
ret.x1 = round (ret.x1);
ret.y0 = round (ret.y0);
ret.y1 = round (ret.y1);
if (rounded) {
ret.x0 = round (ret.x0);
ret.x1 = round (ret.x1);
ret.y0 = round (ret.y0);
ret.y1 = round (ret.y1);
}
return ret;
}
@@ -766,7 +768,7 @@ Item::render_children (Rect const & area, Cairo::RefPtr<Cairo::Context> context)
continue;
}
Rect item = (*i)->item_to_window (item_bbox.get());
Rect item = (*i)->item_to_window (item_bbox.get(), false);
boost::optional<Rect> d = item.intersection (area);
if (d) {