const graphene_rect_t* viewport
Renders the scene graph, described by a tree of
renderer will acquire a reference on the
GskRenderNode tree while
the rendering is in progress.
If you want to apply any transformations to
root, you should put it into a
transform node and pass that node instead.
GdkTexture with the rendered contents of
|The caller of the method takes ownership of the returned data, and is responsible for freeing it.