Improve scrolling performance for sessions containing hundreds of regions over many tracks by hiding offscreen tracks (scroll faster by making tracks larger, exposing fewer of them). Use distance from screen edges to drive autoscrolling distance. Avoid using canvas coordinates for displacement calculations where possible. Don't redisplay tempo in the colour handler.

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@3853 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 25 insertions, 54 deletions

diff --git a/gtk2_ardour/editor_canvas.cc b/gtk2_ardour/editor_canvas.cc
index 53f114c962..870f195bae 100644
--- a/gtk2_ardour/editor_canvas.cc
+++ b/gtk2_ardour/editor_canvas.cc
@@ -333,6 +333,8 @@ Editor::track_canvas_size_allocated ()
 
 	update_fixed_rulers();
 
+	last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
+
 	Resized (); /* EMIT_SIGNAL */
 
 	return false;
@@ -350,6 +352,7 @@ Editor::controls_layout_size_request (Requisition* req)
 		TimeAxisView *tv = (*i)[route_display_columns.tv];
 		if (tv != 0) {
 			pos += tv->effective_height;
+			tv->clip_to_viewport ();
 		}
 	}
 
@@ -511,29 +514,17 @@ Editor::drop_regions (const RefPtr<Gdk::DragContext>& context,
 void
 Editor::maybe_autoscroll (GdkEventMotion* event)
 {
+
 	nframes64_t rightmost_frame = leftmost_frame + current_page_frames();
 	nframes64_t frame = drag_info.current_pointer_frame;
 	bool startit = false;
-	double vertical_pos = vertical_adjustment.get_value();
-	double upper = vertical_adjustment.get_upper();
-
-	/* 
-	   adjust the event.y to take account of the bounds 
-	   of the _trackview_group 
-	*/
-
-	double vsx1, vsx2, vsy1, vsy2;
-	_trackview_group->get_bounds (vsx1, vsy1, vsx2, vsy2);
 
 	autoscroll_y = 0;
 	autoscroll_x = 0;
-
-	if ((event->y - vsy1) < vertical_pos) {
+	if (event->y < canvas_timebars_vsize) {
 		autoscroll_y = -1;
 		startit = true;
-	}
-
-	if ((event->y - vsy1) > (vertical_pos + canvas_height - canvas_timebars_vsize) && vertical_pos <= upper) {
+	} else if (event->y > canvas_height) {
 		autoscroll_y = 1;
 		startit = true;
 	}
@@ -622,44 +613,21 @@ Editor::autoscroll_canvas ()
 	double target_pixel;
 
 	if (autoscroll_x_distance != 0) {
+		if (autoscroll_x > 0) {
+			autoscroll_x_distance = (unit_to_frame (drag_info.current_pointer_x) - (leftmost_frame + current_page_frames())) / 3;
+		} else if (autoscroll_x < 0) {
+			autoscroll_x_distance = (leftmost_frame - unit_to_frame (drag_info.current_pointer_x)) / 3;
 
-		if (autoscroll_cnt == 50) { /* 0.5 seconds */
-			
-			/* after about a while, speed up a bit by changing the timeout interval */
-			
-			autoscroll_x_distance = (nframes64_t) floor (current_page_frames()/30.0f);
-			
-		} else if (autoscroll_cnt == 150) { /* 1.0 seconds */
-			
-			autoscroll_x_distance = (nframes64_t) floor (current_page_frames()/20.0f);
-			
-		} else if (autoscroll_cnt == 300) { /* 1.5 seconds */
-			
-			/* after about another while, speed up by increasing the shift per callback */
-			
-			autoscroll_x_distance =  (nframes64_t) floor (current_page_frames()/10.0f);
-			
-		} 
+		}
 	}
 
 	if (autoscroll_y_distance != 0) {
+		if (autoscroll_y > 0) {
+			autoscroll_y_distance = (drag_info.current_pointer_y - (get_trackview_group_vertical_offset() + canvas_height)) / 3;
+		} else if (autoscroll_y < 0) {
 
-		if (autoscroll_cnt == 50) { /* 0.5 seconds */
-			
-			/* after about a while, speed up a bit by changing the timeout interval */
-			
-			autoscroll_y_distance = 10;
-			
-		} else if (autoscroll_cnt == 150) { /* 1.0 seconds */
-			
-			autoscroll_y_distance = 20;
-			
-		} else if (autoscroll_cnt == 300) { /* 1.5 seconds */
-			
-			/* after about another while, speed up by increasing the shift per callback */
-			
-			autoscroll_y_distance =  40;
-		} 
+			autoscroll_y_distance = (vertical_adjustment.get_value () - drag_info.current_pointer_y) / 3;
+		}
 	}
 
 	if (autoscroll_x < 0) {
@@ -716,8 +684,6 @@ Editor::autoscroll_canvas ()
 		new_pixel = vertical_pos;
 	}
 
-
-
 	if ((new_frame == 0 || new_frame == limit) && (new_pixel == 0 || new_pixel == DBL_MAX)) {
 		/* we are done */
 		return false;
@@ -843,13 +809,16 @@ Editor::scroll_canvas_vertically ()
 {
 	/* vertical scrolling only */
 
-	double x1, x2, y1, y2, y_delta;
+	double y_delta;
 
-	_trackview_group->get_bounds(x1, y1, x2, y2);
-	y_delta = y1 + get_trackview_group_vertical_offset ();
+	y_delta = last_trackview_group_vertical_offset - get_trackview_group_vertical_offset ();
 
-	_trackview_group->move (0, -y_delta);
+	_trackview_group->move (0, y_delta);
 
+	for (TrackViewList::iterator i = track_views.begin(); i != track_views.end(); ++i) {
+		(*i)->clip_to_viewport ();
+	}
+	last_trackview_group_vertical_offset = get_trackview_group_vertical_offset ();
 	/* required to keep the controls_layout in lock step with the canvas group */
 	track_canvas->update_now ();
 }
@@ -938,10 +907,12 @@ Editor::color_handler()
 	location_punch_color = ARDOUR_UI::config()->canvasvar_LocationPunch.get();
 
 	refresh_location_display ();
+/*
 	redisplay_tempo (true);
 
 	if (session)
 		session->tempo_map().apply_with_metrics (*this, &Editor::draw_metric_marks); // redraw metric markers
+*/
 }
 
 void