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Add PreRender signal to the canvas

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Emitted by the canvas immediately before rendering.
This commit is contained in:
Tim Mayberry 2017-03-13 20:45:13 +10:00
parent 48fd06a209
commit d6e7082797
2 changed files with 4 additions and 0 deletions
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2
libs/canvas/canvas.cc
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@ -101,6 +101,8 @@ Canvas::zoomed ()
void
Canvas::render (Rect const & area, Cairo::RefPtr<Cairo::Context> const & context) const
{
PreRender (); // emit signal
#ifdef CANVAS_DEBUG
if (DEBUG_ENABLED(PBD::DEBUG::CanvasRender)) {
cerr << this << " RENDER: " << area << endl;