1 files changed, 94 insertions, 0 deletions
diff --git a/src/graphics/FilterHighpass.cpp b/src/graphics/FilterHighpass.cpp
new file mode 100644
index 0000000..d2c2679
--- /dev/null
+++ b/src/graphics/FilterHighpass.cpp
@@ -0,0 +1,94 @@
+//
+//  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
+//
+
+#include "FilterHighpass.h"
+#include "Filterfill.h"
+#include "Pixel8.h"
+#include "Bitmap.h"
+
+#include "../base/Exception.h"
+
+#include <cstring>
+#include <iostream>
+#include <sstream>
+
+using namespace std;
+
+namespace avg {
+    
+FilterHighpass::FilterHighpass()
+{
+}
+
+FilterHighpass::~FilterHighpass()
+{
+}
+
+BitmapPtr FilterHighpass::apply(BitmapPtr pBmpSrc)
+{
+    AVG_ASSERT(pBmpSrc->getPixelFormat() == I8);
+    BitmapPtr pBmpDest = BitmapPtr(new Bitmap(pBmpSrc->getSize(), I8,
+            pBmpSrc->getName()));
+    int srcStride = pBmpSrc->getStride();
+    int destStride = pBmpDest->getStride();
+    unsigned char * pSrcLine = pBmpSrc->getPixels()+3*srcStride;
+    unsigned char * pDestLine = pBmpDest->getPixels()+3*destStride;
+    IntPoint size = pBmpDest->getSize();
+    for (int y = 3; y < size.y-3; ++y) {
+        unsigned char * pSrcPixel = pSrcLine+3;
+        unsigned char * pDstPixel = pDestLine;
+        *pDstPixel++ = 128;
+        *pDstPixel++ = 128;
+        *pDstPixel++ = 128;
+        for (int x = 3; x < size.x-3; ++x) {
+            // Convolution Matrix is
+            // -1  0  0   0  -1
+            //  0 -1  0  -1   0
+            //  0  0  8   0   0
+            //  0 -1  0  -1   0
+            // -1  0  0   0  -1
+            // Actually, it's 7x7, but you get the idea.
+            *pDstPixel = 128 - int(*(pSrcPixel-3*srcStride-3) 
+                    + *(pSrcPixel-3*srcStride+3) + *(pSrcPixel+3*srcStride-3) 
+                    + *(pSrcPixel+3*srcStride+3))/16; 
+            *pDstPixel += 
+                - int(*(pSrcPixel-2*srcStride-2) + *(pSrcPixel-2*srcStride+2) + 
+                      *(pSrcPixel-srcStride-1) + *(pSrcPixel-1*srcStride+1) +
+                      *(pSrcPixel+srcStride-1) + *(pSrcPixel+1*srcStride+1) + 
+                      *(pSrcPixel+2*srcStride-2) + *(pSrcPixel+2*srcStride+2))/16
+                + *(pSrcPixel)*3/4;
+
+            ++pSrcPixel;
+            ++pDstPixel;
+        }
+        *pDstPixel++ = 128;
+        *pDstPixel++ = 128;
+        *pDstPixel++ = 128;
+        pSrcLine += srcStride;
+        pDestLine += destStride;
+    }
+    // Set top and bottom borders.
+    memset(pBmpDest->getPixels(), 128, destStride*3);
+    memset(pBmpDest->getPixels()+destStride*(size.y-3), 128, destStride*3);
+    return pBmpDest;
+}
+
+}