1 files changed, 141 insertions, 0 deletions
diff --git a/src/graphics/FilterConvol.h b/src/graphics/FilterConvol.h
new file mode 100644
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--- /dev/null
+++ b/src/graphics/FilterConvol.h
@@ -0,0 +1,141 @@
+//
+//  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 _FilterConvol_H
+#define _FilterConvol_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.
+template<class Pixel>
+class AVG_API FilterConvol : public Filter
+{
+public:
+    FilterConvol(float *Mat,int n,int m, int offset=0);
+    virtual ~FilterConvol();
+    virtual BitmapPtr apply(BitmapPtr pBmpSource);
+
+private:
+    void convolveLine(const unsigned char* pSrc, unsigned char* pDest, 
+            int lineLen, int stride, int offset = 0) const;
+    int m_N;
+    int m_M;
+    int m_Offset;
+    float *m_Mat;
+};
+template <class Pixel>
+void FilterConvol<Pixel>::convolveLine(const unsigned char* pSrc, unsigned char* pDest, 
+        int lineLen, int stride, int offset) 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<m_N; i++) {
+            for (int j=0; j<m_N; j++) {
+                unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
+                Pixel SrcPixel = *((Pixel *)pLineStart+j);
+                NewR += SrcPixel.getR()*m_Mat[m_N*i+j];
+                NewG += SrcPixel.getG()*m_Mat[m_N*i+j];
+                NewB += SrcPixel.getB()*m_Mat[m_N*i+j];
+            }
+        }
+        *pDestPixel = Pixel((unsigned char)(NewR+offset), (unsigned char)(NewG+offset), 
+                (unsigned char)(NewB+offset));
+        
+        pSrcPixel++;
+        pDestPixel++;
+    }
+}
+template <>
+void FilterConvol<Pixel8>::convolveLine(const unsigned char* pSrc, unsigned char* pDest, 
+        int lineLen, int stride, int offset) const 
+{
+    Pixel8 * pSrcPixel = (Pixel8 *)pSrc;
+    Pixel8 * pDestPixel = (Pixel8 *)pDest;
+    for (int x=0; x<lineLen; ++x) {
+        float New = 0;
+
+        for (int i=0; i<m_N; i++) {
+            for (int j=0; j<m_N; j++) {
+                unsigned char * pLineStart = (unsigned char *)pSrcPixel+i*stride;
+                Pixel8 SrcPixel = *((Pixel8 *)pLineStart+j);
+                New += SrcPixel.get()*m_Mat[m_N*i+j];
+            }
+        }
+        *pDestPixel = Pixel8((unsigned char)(New+offset));
+        
+        pSrcPixel++;
+        pDestPixel++;
+    }
+}
+template <class Pixel>
+FilterConvol<Pixel>::FilterConvol(float *Mat, int n, int m, int offset)
+  : Filter(),
+    m_N(n),
+    m_M(m),
+    m_Offset(offset)
+{
+    m_Mat = new float[n*m];
+    for (int y=0; y<n; y++) {
+        for (int x=0; x<m; x++) {
+            m_Mat[m_N*y+x] = Mat[m_N*y+x];
+        }
+    }
+}
+template <class Pixel>
+FilterConvol<Pixel>::~FilterConvol()
+{
+    delete[] m_Mat;
+
+}
+template <class Pixel>
+BitmapPtr FilterConvol<Pixel>::apply(BitmapPtr pBmpSource) 
+{
+    IntPoint NewSize(pBmpSource->getSize().x-m_N+1, pBmpSource->getSize().y-m_M+1);
+    BitmapPtr pNewBmp(new Bitmap(NewSize, pBmpSource->getPixelFormat(),
+            pBmpSource->getName()+"_filtered"));
+            
+    for (int y = 0; y < NewSize.y; y++) {
+        const unsigned char * pSrc = pBmpSource->getPixels()+y*pBmpSource->getStride();
+        unsigned char * pDest = pNewBmp->getPixels()+y*pNewBmp->getStride();
+        convolveLine(pSrc, pDest, NewSize.x, pBmpSource->getStride(), m_Offset);
+    }
+    return pNewBmp;
+}
+
+
+}
+
+#endif
+