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//
// 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;
}
}
}
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