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Only call Gtk::Widget::queue_draw_area in canvas when item and visible area intersect

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Refactor GtkCanvas::request_redraw to use Rect::intersection
This commit is contained in:
Tim Mayberry 2017-04-01 23:33:16 +10:00
parent c4e31fc322
commit 8538ba35fe
1 changed files with 10 additions and 10 deletions
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20
libs/canvas/canvas.cc
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@ -1197,19 +1197,19 @@ GtkCanvas::request_redraw (Rect const & request)
return; return;
} }
Rect real_area;
Coord const w = width ();
Coord const h = height ();
/* clamp area requested to actual visible window */ /* clamp area requested to actual visible window */
real_area.x0 = max (0.0, min (w, request.x0)); Rect real_area = request.intersection (visible_area());
real_area.x1 = max (0.0, min (w, request.x1));
real_area.y0 = max (0.0, min (h, request.y0));
real_area.y1 = max (0.0, min (h, request.y1));
queue_draw_area (real_area.x0, real_area.y0, real_area.width(), real_area.height()); if (real_area) {
if (real_area.width () && real_area.height ()) {
// Item intersects with visible canvas area
queue_draw_area (real_area.x0, real_area.y0, real_area.width(), real_area.height());
}
} else {
// Item does not intersect with visible canvas area
}
} }
/** Called to request that we try to get a particular size for ourselves. /** Called to request that we try to get a particular size for ourselves.