1 files changed, 80 insertions, 0 deletions
diff --git a/src/graphics/Filtergrayscale.cpp b/src/graphics/Filtergrayscale.cpp
new file mode 100644
index 0000000..58a2336
--- /dev/null
+++ b/src/graphics/Filtergrayscale.cpp
@@ -0,0 +1,80 @@
+//
+//  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 "Filtergrayscale.h"
+
+#include "Pixeldefs.h"
+
+#include <iostream>
+
+namespace avg {
+
+using namespace std;
+    
+FilterGrayscale::FilterGrayscale()
+    : Filter()
+{
+}
+
+FilterGrayscale::~FilterGrayscale()
+{
+
+}
+
+BitmapPtr FilterGrayscale::apply(BitmapPtr pBmpSrc) 
+{
+    PixelFormat PF = pBmpSrc->getPixelFormat();
+    if (PF == I8) {
+        return BitmapPtr(new Bitmap(*pBmpSrc));
+    }
+    BitmapPtr pBmpDest = BitmapPtr(new Bitmap(pBmpSrc->getSize(), I8,
+             pBmpSrc->getName()));
+    unsigned char * pSrcLine = pBmpSrc->getPixels();
+    unsigned char * pDestLine = pBmpDest->getPixels();
+    IntPoint size = pBmpDest->getSize();
+    int bpp = pBmpSrc->getBytesPerPixel();
+    for (int y = 0; y<size.y; ++y) {
+        unsigned char * pSrcPixel = pSrcLine;
+        unsigned char * pDstPixel = pDestLine;
+        for (int x = 0; x < size.x; ++x) {
+            // For the coefficients used, see http://www.inforamp.net/~poynton/
+            // Appoximations curtesy of libpng :-).
+            if (PF == R8G8B8A8 || PF == R8G8B8X8 || PF == R8G8B8) {
+                *pDstPixel = (unsigned char)((pSrcPixel[REDPOS]*54+
+                        pSrcPixel[GREENPOS]*183+
+                        pSrcPixel[BLUEPOS]*19)/256);
+                pSrcPixel += bpp;
+                ++pDstPixel;
+            } else {
+                *pDstPixel = (unsigned char)((pSrcPixel[BLUEPOS]*54+
+                        pSrcPixel[GREENPOS]*183+
+                        pSrcPixel[REDPOS]*19)/256);
+                pSrcPixel += bpp;
+                ++pDstPixel;
+            }
+        }
+        pSrcLine = pSrcLine + pBmpSrc->getStride();
+        pDestLine = pDestLine + pBmpDest->getStride();
+    }
+    return pBmpDest;
+}
+
+}