Function gtk::functions::cairo_transform_to_window
source · [−]Expand description
Transforms the given cairo context cr
that from widget
-relative
coordinates to window
-relative coordinates.
If the widget
’s window is not an ancestor of window
, no
modification will be applied.
This is the inverse to the transformation GTK applies when
preparing an expose event to be emitted with the signal::Widget::draw
signal. It is intended to help porting multiwindow widgets from
GTK+ 2 to the rendering architecture of GTK+ 3.
cr
the cairo context to transform
widget
the widget the context is currently centered for
window
the window to transform the context to