ardour/livetrax
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tentative fix for canvas background/image surface

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This commit is contained in:
Robin Gareus 2014-11-07 16:50:21 +01:00
parent 159cb4d2f9
commit 0fedfab593
1 changed files with 8 additions and 3 deletions
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11
libs/canvas/canvas.cc
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@ -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 */