1 files changed, 82 insertions, 0 deletions
diff --git a/src/graphics/Filter3x3.h b/src/graphics/Filter3x3.h
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+++ b/src/graphics/Filter3x3.h
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+//
+//  libavg - Media Playback Engine.
+//  Copyright (C) 2003-2014 Ulrich von Zadow
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2 of the License, or (at your option) any later version.
+//
+//  This library 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
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//  Current versions can be found at www.libavg.de
+//
+
+#ifndef _Filter3x3_H
+#define _Filter3x3_H
+
+#include "../api.h"
+#include "Filter.h"
+
+#include "Pixel8.h"
+#include "Pixel24.h"
+#include "Pixel32.h"
+
+#include <iostream>
+
+namespace avg {
+
+// Filter that applies a 3x3 kernel to the bitmap.
+class AVG_API Filter3x3 : public Filter
+{
+public:
+    Filter3x3(float Mat[3][3]);
+    virtual ~Filter3x3();
+    virtual BitmapPtr apply(BitmapPtr pBmpSource);
+
+private:
+    template<class PIXEL>
+    void convolveLine(const unsigned char * pSrc, unsigned char * pDest,
+            int lineLen, int stride) const;
+    float m_Mat[3][3];
+};
+
+template<class PIXEL>
+void Filter3x3::convolveLine(const unsigned char * pSrc, unsigned char * pDest,
+        int lineLen, int stride) const
+{
+    PIXEL * pSrcPixel = (PIXEL *)pSrc;
+    PIXEL * pDestPixel = (PIXEL *)pDest;
+    for (int x = 0; x < lineLen; ++x) {
+        float newR = 0;
+        float newG = 0;
+        float newB = 0;
+
+        for (int i = 0; i < 3; i++) {
+            unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
+            for (int j = 0; j < 3; j++) {
+                PIXEL SrcPixel = *((PIXEL *)pLineStart+j);
+                newR += SrcPixel.getR()*m_Mat[i][j];
+                newG += SrcPixel.getG()*m_Mat[i][j];
+                newB += SrcPixel.getB()*m_Mat[i][j];
+            }
+        }
+        *pDestPixel = PIXEL((unsigned char)newR, (unsigned char)newG,
+                (unsigned char)newB);
+
+        pSrcPixel++;
+        pDestPixel++;
+    }
+}
+
+}
+
+#endif
+