change the meters into CairoWidget, add expose_area to CairoWidget::render()

1 files changed, 7 insertions, 1 deletions

diff --git a/libs/gtkmm2ext/cairo_widget.cc b/libs/gtkmm2ext/cairo_widget.cc
index 70c52bf177..b7d9b08c72 100644
--- a/libs/gtkmm2ext/cairo_widget.cc
+++ b/libs/gtkmm2ext/cairo_widget.cc
@@ -53,7 +53,13 @@ CairoWidget::on_expose_event (GdkEventExpose *ev)
 	cairo_set_source_rgb (cr, bg.get_red_p(), bg.get_green_p(), bg.get_blue_p());
 	cairo_fill (cr);
 
-	render (cr);
+	cairo_rectangle_t expose_area;
+	expose_area.x = ev->area.x;
+	expose_area.y = ev->area.y;
+	expose_area.width = ev->area.width;
+	expose_area.height = ev->area.height;
+
+	render (cr, &expose_area);
 
 	cairo_destroy (cr);