provide an additional callback function for controlling frame interception

Some postplugins override a frame's draw function just to get/manipulate
frame related information -- and not for drawing on the frame.
The current implementation disables any preprocessing function even if the
plugin is not going to draw on the frame. By introducing a further callback
function route_preprocessing_procs() a plugin is now able to tell that it
is not going to draw on the frame, i. e. it is ok to route the preprocessing
functions to the intercepted frame, too.

--HG--
extra : transplant_source : %170%82%B8%8F%BA%3D%25%9B%D7%EF%E5%B3%3B%EEg%A0%D1be

0 files changed, 0 insertions, 0 deletions