Fix broken logic and possible NULL pointer dereference for Bundle XML.

[ardour.git] / libs / canvas / canvas.cc

diff --git a/libs/canvas/canvas.cc b/libs/canvas/canvas.cc
index 133e09484c5522a701fad8dfd585ae773e1b4dd3..be0f25d7a24f1afed057e85dbc10ba947e4a35fd 100644 (file)
--- a/libs/canvas/canvas.cc
+++ b/libs/canvas/canvas.cc
@@ -32,9 +32,11 @@
 #include "pbd/stacktrace.h"
 
 #include "canvas/canvas.h"
+#include "canvas/colors.h"
 #include "canvas/debug.h"
 #include "canvas/line.h"
 #include "canvas/scroll_group.h"
+#include "canvas/utils.h"
 
 using namespace std;
 using namespace ArdourCanvas;
@@ -44,6 +46,7 @@ uint32_t Canvas::tooltip_timeout_msecs = 750;
 /** Construct a new Canvas */
 Canvas::Canvas ()
        : _root (this)
+        , _bg_color (rgba_to_color (0, 1.0, 0.0, 1.0))
 {
        set_epoch ();
 }
@@ -340,6 +343,18 @@ Canvas::set_tooltip_timeout (uint32_t msecs)
        tooltip_timeout_msecs = msecs;
 }
 
+void
+Canvas::set_background_color (Color c)
+{
+        _bg_color = c;
+
+        boost::optional<Rect> r = _root.bounding_box();
+
+        if (r) {
+                request_redraw (_root.item_to_window (r.get()));
+        }
+}
+
 void
 GtkCanvas::re_enter ()
 {
@@ -359,7 +374,8 @@ GtkCanvas::GtkCanvas ()
 {
        /* these are the events we want to know about */
        add_events (Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK | Gdk::POINTER_MOTION_MASK |
-                   Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK);
+                   Gdk::SCROLL_MASK | Gdk::ENTER_NOTIFY_MASK | Gdk::LEAVE_NOTIFY_MASK |
+                   Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
 }
 
 void
@@ -720,6 +736,18 @@ GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
        
 }
 
+void
+GtkCanvas::on_size_allocate (Gtk::Allocation& a)
+{
+       EventBox::on_size_allocate (a);
+#ifdef USE_CAIRO_IMAGE_SURFACE
+       /* allocate an image surface as large as the canvas itself */
+
+       canvas_image.clear ();
+       canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, a.get_width(), a.get_height());
+#endif
+}
+
 /** Handler for GDK expose events.
  *  @param ev Event.
  *  @return true if the event was handled.
@@ -727,21 +755,38 @@ GtkCanvas::item_going_away (Item* item, boost::optional<Rect> bounding_box)
 bool
 GtkCanvas::on_expose_event (GdkEventExpose* ev)
 {
-       Cairo::RefPtr<Cairo::Context> cairo_context = get_window()->create_cairo_context ();
-       render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), cairo_context);
-       return true;
-}
-
-/** @return Our Cairo context, or 0 if we don't have one */
-Cairo::RefPtr<Cairo::Context>
-GtkCanvas::context ()
-{
-       Glib::RefPtr<Gdk::Window> w = get_window ();
-       if (!w) {
-               return Cairo::RefPtr<Cairo::Context> ();
+#ifdef USE_CAIRO_IMAGE_SURFACE
+       if (!canvas_image) {
+               canvas_image = Cairo::ImageSurface::create (Cairo::FORMAT_ARGB32, get_width(), get_height());
        }
+        Cairo::RefPtr<Cairo::Context> draw_context = Cairo::Context::create (canvas_image);
+       Cairo::RefPtr<Cairo::Context> window_context = get_window()->create_cairo_context ();
+#else 
+       Cairo::RefPtr<Cairo::Context> draw_context = get_window()->create_cairo_context ();
+#endif
 
-       return w->create_cairo_context ();
+        /* draw background color */
+        
+        draw_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+        draw_context->clip_preserve ();
+        set_source_rgba (draw_context, _bg_color);
+        draw_context->fill ();
+        
+        /* render canvas */
+        
+        render (Rect (ev->area.x, ev->area.y, ev->area.x + ev->area.width, ev->area.y + ev->area.height), draw_context);
+
+#ifdef USE_CAIRO_IMAGE_SURFACE
+       /* now blit our private surface back to the GDK one */
+
+       window_context->rectangle (ev->area.x, ev->area.y, ev->area.width, ev->area.height);
+       window_context->clip ();
+       window_context->set_source (canvas_image, 0, 0);
+       window_context->set_operator (Cairo::OPERATOR_SOURCE);
+       window_context->paint ();
+#endif
+
+       return true;
 }
 
 /** Handler for GDK scroll events.
@@ -770,6 +815,28 @@ GtkCanvas::on_scroll_event (GdkEventScroll* ev)
        return deliver_event (reinterpret_cast<GdkEvent*>(&copy));
 }
 
+/** Handler for GDK key press events.
+ *  @param ev Event.
+ *  @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_key_press_event (GdkEventKey* ev)
+{
+       DEBUG_TRACE (PBD::DEBUG::CanvasEvents, "canvas key press\n");
+       return deliver_event (reinterpret_cast<GdkEvent*>(ev));
+}
+
+/** Handler for GDK key release events.
+ *  @param ev Event.
+ *  @return true if the event was handled.
+ */
+bool
+GtkCanvas::on_key_release_event (GdkEventKey* ev)
+{
+       DEBUG_TRACE (PBD::DEBUG::CanvasEvents, "canvas key release\n");
+       return deliver_event (reinterpret_cast<GdkEvent*>(ev));
+}
+
 /** Handler for GDK button press events.
  *  @param ev Event.
  *  @return true if the event was handled.