This fixes an issues where Ardour never completes to flush the GUI event
queue due to rapid updates for meters and similar events.
ARDOUR_UI::load_session() never returned and the complete session
ran inside Gtkmm2ext::UI::flush_pending(), this later causes a crash
at exit.
as side effect, this also speeds up session load.
- removes the need for 'pixel hunting' wrt NAME_HIGHLIGHT_SIZE.
- new control points generated by clicking on a line are placed
where the verbose canvas cursor says they are.
looks like not all AU plugin GUIs redraw themselves if
[win setAutodisplay:1] is unnot.
A user reported that some Waves plugins and Shattered Glass 32bit AUs
are blank in 4.4 on 32bit OSX.
see also 5eefdf7 and earlier AU/API changes.
There is anecdotal evidence that using mpeg4 as codec leads to issues
(xjadeo indexes and gets stuck at 99%, likely in libavcodec).
The main motivation for using mpeg4 is/was windows/VFAT 2GB file limit
and improved video quality. This will have to be revisited.
Currently when a GhostRegion is deleted by its "parent" RegionView it emits the
static GhostRegion::CatchDeletion signal which is connected to the
RegionView::remove_ghost method of every RegionView instance.
With a static GhostRegion::CatchDeletion signal a particular test session
causes 31 Million calls of RegionView::remove_ghost on Session deletion and the
session takes 70 seconds to close with a debug build.
The lifetime of a ghost region is tied to both the TimeAxisView(TAV) and
RegionView(RV) in that when a RegionView is deleted all GhostRegion instances
associated with the RegionView should be deleted or when a TimeAxisView is
deleted all ghost regions that are contained in the view should be deleted.
This means that there needs to be notification between GhostRegion and both
classes. Instead of using a signal for this as we know there are only two
listeners and GhostRegion already holds a reference to the TimeAxisView, also
take a reference to the parent RegionView in the GhostRegion constructor and
use it to notify the RegionView when GhostRegion destructor is called so it can
drop any references it holds.
Using a direct function call in the GhostRegion destructor to notify the
TimeAxisView and RegionView "parents" brings the unload/close time down for the
test session from 70 seconds to 4.5 seconds.
The GhostRegion also references canvas items that are added to the TimeAxisView
canvas group or at least a canvas group that it manages. So when the
TimeAxisView is destroyed and the canvas group that is the parent of those
items is destroyed, the GhostRegion's canvas items will also be
deleted/destroyed by the parent canvas item/group. This means the GhostRegions
must be destroyed when the TimeAxisView they are contained in is destroyed or
there will be dangling references to canvas items that have already been
deleted and trying to delete them again will be bad.
