1 files changed, 157 insertions, 0 deletions
diff --git a/src/graphics/HistoryPreProcessor.cpp b/src/graphics/HistoryPreProcessor.cpp
new file mode 100644
index 0000000..673df90
--- /dev/null
+++ b/src/graphics/HistoryPreProcessor.cpp
@@ -0,0 +1,157 @@
+//
+//  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
+//
+//  Original author of this file is igor@c-base.org.
+//
+
+#include "HistoryPreProcessor.h"
+
+#include "Bitmap.h"
+#include "Filterfill.h"
+
+#include "../base/Exception.h"
+
+#include <iostream>
+#include <sstream>
+
+using namespace std;
+
+#define FAST_HISTORY_SPEED 16
+
+namespace avg {
+    
+HistoryPreProcessor::HistoryPreProcessor(IntPoint dimensions, 
+        unsigned int updateInterval, bool bBrighter)
+    : m_FrameCounter(0),
+      m_UpdateInterval(updateInterval),
+      m_bBrighter(bBrighter)
+{
+    m_pHistoryBmp = BitmapPtr(new Bitmap(dimensions, I16));
+    reset();
+}
+
+HistoryPreProcessor::~HistoryPreProcessor()
+{
+}
+
+void HistoryPreProcessor::setInterval(unsigned int updateInterval)
+{
+    m_FrameCounter = 0;
+    m_UpdateInterval = updateInterval;
+}
+
+unsigned int HistoryPreProcessor::getInterval()
+{
+    return m_UpdateInterval;
+}
+
+void HistoryPreProcessor::reset()
+{
+    m_State = NO_IMAGE;
+}
+
+void HistoryPreProcessor::updateHistory(BitmapPtr pNewBmp)
+{
+    AVG_ASSERT(pNewBmp->getSize() == m_pHistoryBmp->getSize());
+    switch (m_State) {
+        case NO_IMAGE:
+            m_pHistoryBmp->copyPixels(*pNewBmp);
+            m_State = INITIALIZING;
+            m_NumInitImages = 0;
+            break;
+        case INITIALIZING:
+            calcAvg<FAST_HISTORY_SPEED>(pNewBmp);
+            m_NumInitImages++;
+            if (m_NumInitImages == FAST_HISTORY_SPEED*2) {
+                m_State = NORMAL;
+            }
+            break;
+        case NORMAL:
+            if (m_FrameCounter < m_UpdateInterval-1) {
+                m_FrameCounter++;
+            } else {
+                m_FrameCounter = 0;
+                calcAvg<256>(pNewBmp);
+            }
+            break;
+    }
+}
+
+void HistoryPreProcessor::applyInPlace(BitmapPtr pBmp)
+{
+    updateHistory(pBmp);
+    unsigned short * pSrc = (unsigned short*)m_pHistoryBmp->getPixels();
+    int srcStride = m_pHistoryBmp->getStride()/m_pHistoryBmp->getBytesPerPixel();
+    int destStride = pBmp->getStride();
+    unsigned char * pDest = pBmp->getPixels();
+    IntPoint size = pBmp->getSize();
+    for (int y = 0; y < size.y; y++) {
+        const unsigned short * pSrcPixel = pSrc;
+        unsigned char * pDestPixel = pDest;
+        if (m_bBrighter) {
+            for (int x = 0; x < size.x; x++) {
+                unsigned char Src = *pSrcPixel/256;
+                if ((*pDestPixel) > Src) {
+                    *pDestPixel = *pDestPixel-Src;
+                } else {
+                    *pDestPixel = 0;
+                }
+                pDestPixel++;
+                pSrcPixel++;
+            }
+        } else {
+            for (int x = 0; x < size.x; x++) {
+                unsigned char Src = *pSrcPixel/256;
+                if ((*pDestPixel) < Src) {
+                    *pDestPixel = Src-*pDestPixel;
+                } else {
+                    *pDestPixel = 0;
+                }
+                pDestPixel++;
+                pSrcPixel++;
+            }
+        }
+        pDest += destStride;
+        pSrc += srcStride;
+    }
+}
+
+// Fast pseudo-normalization with an integer factor.
+void HistoryPreProcessor::normalizeHistogram(BitmapPtr pBmp, unsigned char max)
+{
+    if (max < 128) {
+        max = 128;
+    }
+    int factor = int(256.0/max);
+    unsigned char * pLine = pBmp->getPixels();
+    IntPoint size = pBmp->getSize();
+    int stride = pBmp->getStride();
+    for (int y = 0; y < size.y; y++) {
+        unsigned char * pPixel = pLine;
+        for (int x = 0; x < size.x; x++) {
+            *pPixel *= factor;
+            pPixel++;
+        }
+        pLine += stride;
+    }
+}
+
+}
+