Better handling of the ESC key during Freestyle rendering.

This commit is meant to improve the response of the ESC key for stopping Freestyle rendering
throughout the rendering process.  The rendering with Freestyle consists of several steps
including: (1) mesh data loading, (2) winged edge construction, (3) silhouette edge detection,
(4) view map construction, and (5) stroke drawing.  All these steps have been extended to
frequently check if the ESC key is pressed, so that users can abort time-consuming rendering
at any point of time.

1 files changed, 47 insertions, 0 deletions

diff --git a/source/blender/freestyle/intern/system/RenderMonitor.h b/source/blender/freestyle/intern/system/RenderMonitor.h
new file mode 100644
index 00000000000..7d148e65c90
--- /dev/null
+++ b/source/blender/freestyle/intern/system/RenderMonitor.h
@@ -0,0 +1,47 @@
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef RENDERMONITOR_H
+#define RENDERMONITOR_H
+
+extern "C" {
+#include "render_types.h"
+}
+
+class RenderMonitor
+{
+public:
+
+  inline RenderMonitor(Render *re) {
+    _re = re;
+  }
+
+  virtual ~RenderMonitor() {}
+
+  inline bool testBreak() {
+    return _re && _re->test_break(_re->tbh);
+  }
+ 
+protected:
+
+  Render *_re;
+};
+
+#endif // RENDERMONITOR_H