Merge pull request #3 from saurabhb17/master

secondary files

1 files changed, 106 insertions, 0 deletions

diff --git a/include/gal/compositor.h b/include/gal/compositor.h
new file mode 100644
index 0000000..cd1d636
--- /dev/null
+++ b/include/gal/compositor.h
@@ -0,0 +1,106 @@
+/*
+ * 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 compositor.h
+ * @brief Class that handles multitarget rendering (ie. to different textures/surfaces) and
+ * later compositing into a single image.
+ */
+
+#ifndef COMPOSITOR_H_
+#define COMPOSITOR_H_
+
+namespace KIGFX
+{
+
+class COMPOSITOR
+{
+public:
+    virtual ~COMPOSITOR()
+    {
+    }
+
+    /**
+     * Function Reset()
+     * performs primary initialiation, necessary to use the object.
+     */
+    virtual void Initialize() = 0;
+
+    /**
+     * Function Resize()
+     * clears the state of COMPOSITOR, so it has to be reinitialized again with the new dimensions.
+     *
+     * @param aWidth is the framebuffer width (in pixels).
+     * @param aHeight is the framebuffer height (in pixels).
+     */
+    virtual void Resize( unsigned int aWidth, unsigned int aHeight ) = 0;
+
+    /**
+     * Function CreateBuffer()
+     * prepares a new buffer that may be used as a rendering target.
+     *
+     * @return is the handle of the buffer. In case of failure 0 (zero) is returned as the handle.
+     */
+    virtual unsigned int CreateBuffer() = 0;
+
+    /**
+     * Function GetBuffer()
+     * returns currently used buffer handle.
+     *
+     * @return Currently used buffer handle.
+     */
+    virtual unsigned int GetBuffer() const = 0;
+
+    /**
+     * Function SetBuffer()
+     * sets the selected buffer as the rendering target. All the following drawing functions are
+     * going to be rendered in the selected buffer.
+     *
+     * @param aBufferHandle is the handle of the buffer or 0 in case of rendering directly to the
+     * display.
+     */
+    virtual void SetBuffer( unsigned int aBufferHandle ) = 0;
+
+    /**
+     * Function ClearBuffer()
+     * clears the selected buffer (set by the SetBuffer() function).
+     */
+    virtual void ClearBuffer() = 0;
+
+    /**
+     * Function DrawBuffer()
+     * draws the selected buffer on the screen.
+     *
+     * @param aBufferHandle is the handle of the buffer to be drawn.
+     */
+    virtual void DrawBuffer( unsigned int aBufferHandle ) = 0;
+
+protected:
+    unsigned int m_width;           ///< Width of the buffer (in pixels)
+    unsigned int m_height;          ///< Height of the buffer (in pixels)
+};
+
+} // namespace KIGFX
+
+#endif /* COMPOSITOR_H_ */