1 files changed, 77 insertions, 0 deletions
diff --git a/src/graphics/FilterBandpass.cpp b/src/graphics/FilterBandpass.cpp
new file mode 100644
index 0000000..f4a3546
--- /dev/null
+++ b/src/graphics/FilterBandpass.cpp
@@ -0,0 +1,77 @@
+//
+//  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 "FilterBandpass.h"
+#include "Filterfill.h"
+#include "Pixel8.h"
+#include "Bitmap.h"
+
+#include <iostream>
+#include <math.h>
+
+using namespace std;
+
+namespace avg {
+    
+FilterBandpass::FilterBandpass(float lowWidth, float highWidth)
+    : m_HighpassFilter(highWidth),
+      m_LowpassFilter(lowWidth)
+{
+    m_FilterWidthDiff = int(ceil(highWidth))-int(ceil(lowWidth));
+}
+
+FilterBandpass::~FilterBandpass()
+{
+}
+
+BitmapPtr FilterBandpass::apply(BitmapPtr pBmpSrc)
+{
+    BitmapPtr pLPBmp = m_LowpassFilter.apply(pBmpSrc);
+    BitmapPtr pHPBmp = m_HighpassFilter.apply(pBmpSrc);
+
+    IntPoint Size = pHPBmp->getSize();
+    BitmapPtr pDestBmp = BitmapPtr(new Bitmap(Size, I8, pBmpSrc->getName()));
+
+    int lpStride = pLPBmp->getStride();
+    int hpStride = pHPBmp->getStride();
+    int destStride = pDestBmp->getStride();
+    unsigned char * pLPLine = pLPBmp->getPixels()+m_FilterWidthDiff*lpStride;
+    unsigned char * pHPLine = pHPBmp->getPixels();
+    unsigned char * pDestLine = pDestBmp->getPixels();
+    for (int y = 0; y < Size.y; ++y) {
+        unsigned char * pLPPixel = pLPLine+m_FilterWidthDiff;
+        unsigned char * pHPPixel = pHPLine;
+        unsigned char * pDestPixel = pDestLine;
+        for (int x = 0; x < Size.x; ++x) {
+            *pDestPixel = (int(*pLPPixel)-*pHPPixel)+128;
+            ++pLPPixel;
+            ++pHPPixel;
+            ++pDestPixel;
+        }
+        pLPLine += lpStride;
+        pHPLine += hpStride;
+        pDestLine += destStride;
+    }
+    return pDestBmp;
+}
+
+
+}