1 files changed, 89 insertions, 0 deletions
diff --git a/common/gal/opengl/noncached_container.cpp b/common/gal/opengl/noncached_container.cpp
new file mode 100644
index 0000000..c902c47
--- /dev/null
+++ b/common/gal/opengl/noncached_container.cpp
@@ -0,0 +1,89 @@
+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 CERN
+ * @author Maciej Suminski <maciej.suminski@cern.ch>
+ *
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file noncached_container.cpp
+ * @brief Class to store instances of VERTEX without caching. It allows a fast one-frame drawing
+ * and then clearing the buffer and starting from scratch.
+ */
+
+#include <gal/opengl/noncached_container.h>
+#include <cstdlib>
+
+using namespace KIGFX;
+
+NONCACHED_CONTAINER::NONCACHED_CONTAINER( unsigned int aSize ) :
+    VERTEX_CONTAINER( aSize ), m_freePtr( 0 )
+{
+}
+
+
+NONCACHED_CONTAINER::~NONCACHED_CONTAINER()
+{
+}
+
+
+void NONCACHED_CONTAINER::SetItem( VERTEX_ITEM* aItem )
+{
+    // Nothing has to be done, as the noncached container
+    // does not care about VERTEX_ITEMs ownership
+}
+
+
+VERTEX* NONCACHED_CONTAINER::Allocate( unsigned int aSize )
+{
+    if( m_freeSpace < aSize )
+    {
+        // Double the space
+        VERTEX* newVertices = static_cast<VERTEX*>( realloc( m_vertices,
+                                                             m_currentSize * 2 *
+                                                             sizeof(VERTEX) ) );
+
+        if( newVertices != NULL )
+        {
+            m_vertices    = newVertices;
+            m_freeSpace   += m_currentSize;
+            m_currentSize *= 2;
+        }
+        else
+        {
+            return NULL;
+        }
+    }
+
+    VERTEX* freeVertex = &m_vertices[m_freePtr];
+
+    // Move to the next free chunk
+    m_freePtr   += aSize;
+    m_freeSpace -= aSize;
+
+    return freeVertex;
+}
+
+
+void NONCACHED_CONTAINER::Clear()
+{
+    m_freePtr   = 0;
+    m_freeSpace = m_currentSize;
+}