tentative fix for canvas background/image surface

diff --git a/libs/canvas/canvas.cc b/libs/canvas/canvas.cc
index 9d1d9f3ad9df7c5965b85c827ae4f6fdbe25b79d..85c87a39f0c945ae3a59bc1da7e0118f6a935c82 100644 (file)
--- a/libs/canvas/canvas.cc
+++ b/libs/canvas/canvas.cc
@@ -748,13 +748,18 @@ GtkCanvas::on_expose_event (GdkEventExpose* ev)
                /* scope for image_context */
                Cairo::RefPtr<Cairo::Context> image_context = Cairo::Context::create (canvas_image);
 
-               /* clear expose area to transparent */
+               /* clear expose area */
 
                image_context->save ();
                image_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
                image_context->clip ();
-               image_context->set_operator (Cairo::OPERATOR_CLEAR);
-               image_context->paint ();
+               image_context->set_operator (Cairo::OPERATOR_SOURCE);
+               // TODO get canvas backround see CairoWidget::get_parent_bg
+               // also subscribe to parent's signal_style_changed()
+               // ..until new canvas color-theme API is in place, hardcode some values.
+               image_context->set_source_rgba (84./255., 85./255., 93./255., 1.0);
+               image_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+               image_context->fill ();
                image_context->restore ();
 
                /* render into image surface */