lugre_bitmask.cpp

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#include "lugre_prefix.h"
#include "lugre_bitmask.h"
#include <stdlib.h>
#include <Ogre.h>

namespace Lugre {

cBitMask::cBitMask  () : mpData(0), mbWrap(false) {}
cBitMask::~cBitMask () { Reset(); }

void    cBitMask::SetDataFromOgreImage  (Ogre::Image& pImage,float fMinAlpha) {
    int w = pImage.getWidth(); // m_uWidth
    int h = pImage.getHeight();
    BlankData(w,h);
    for (int y=0;y<h;++y) for (int x=0;x<w;++x) {
        int iPixelOffset = y*w+x;
        if (pImage.getColourAt(x,y,0).a >= fMinAlpha) mpData[iPixelOffset/8] |= (1<<(iPixelOffset%8)); // set the bit
    }
}

void    cBitMask::SetDataFrom16BitImage (const short *pImageData16Bit,const int w,const int h) {
    BlankData(w,h);
    for (int y=0;y<h;++y) for (int x=0;x<w;++x) {
        int iPixelOffset = y*w+x;
        if (pImageData16Bit[iPixelOffset]) mpData[iPixelOffset/8] |= (1<<(iPixelOffset%8)); // set the bit
    }
}

void    cBitMask::BlankData (const int w,const int h) {
    Reset();
    miW = w;
    miH = h;
    int iDataSize = (w*h+7)/8;
    mpData = (char*)malloc(iDataSize);
    memset(mpData,0,iDataSize);
}

void    cBitMask::Reset () { 
    if (mpData) free(mpData); mpData = 0; 
    miW = 0;
    miH = 0;
}

};