Files missing from last commit.

git-svn-id: svn://localhost/ardour2/branches/3.0@5221 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 88 insertions, 0 deletions

diff --git a/gtk2_ardour/cairo_widget.cc b/gtk2_ardour/cairo_widget.cc
new file mode 100644
index 0000000000..f594dd51e1
--- /dev/null
+++ b/gtk2_ardour/cairo_widget.cc
@@ -0,0 +1,88 @@
+#include "cairo_widget.h"
+#include "gui_thread.h"
+
+CairoWidget::CairoWidget ()
+	: _width (1),
+	  _height (1),
+	  _dirty (true),
+	  _pixmap (0)
+{
+
+}
+
+CairoWidget::~CairoWidget ()
+{
+	if (_pixmap) {
+		gdk_pixmap_unref (_pixmap);
+	}
+}
+
+bool
+CairoWidget::on_expose_event (GdkEventExpose *event)
+{
+	Gdk::Rectangle const exposure (
+		event->area.x, event->area.y, event->area.width, event->area.height
+		);
+
+	Gdk::Rectangle r = exposure;
+	Gdk::Rectangle content (0, 0, _width, _height);
+	bool intersects;
+	r.intersect (content, intersects);
+	
+	if (intersects) {
+
+		GdkDrawable* drawable = get_window()->gobj ();
+
+		if (_dirty) {
+
+			if (_pixmap) {
+				gdk_pixmap_unref (_pixmap);
+			}
+
+			_pixmap = gdk_pixmap_new (drawable, _width, _height, -1);
+
+			cairo_t* cr = gdk_cairo_create (_pixmap);
+			render (cr);
+			cairo_destroy (cr);
+
+			_dirty = false;
+		}
+
+		gdk_draw_drawable (
+			drawable,
+			get_style()->get_fg_gc (Gtk::STATE_NORMAL)->gobj(),
+			_pixmap,
+ 			r.get_x(),
+ 			r.get_y(),
+ 			r.get_x(),
+ 			r.get_y(),
+ 			r.get_width(),
+ 			r.get_height()
+			);
+	}
+	
+	return true;
+}
+
+void
+CairoWidget::set_dirty ()
+{
+	ENSURE_GUI_THREAD (mem_fun (*this, &CairoWidget::set_dirty));
+
+	_dirty = true;
+	queue_draw ();
+}
+
+/** Handle a size allocation.
+ *  @param alloc GTK allocation.
+ */
+void
+CairoWidget::on_size_allocate (Gtk::Allocation& alloc)
+{
+	Gtk::EventBox::on_size_allocate (alloc);
+
+	_width = alloc.get_width ();
+	_height = alloc.get_height ();
+
+	set_dirty ();
+}