///////////////////////////////////縮放圖像
static void _ieInterpImageBilinear8UC1_Ver3_RowFilter(unsigned char src, long dst, int len, int leftIdx, int rightIdx, long weight, int shift)
{
    int i;
    for(i = 0; i < len - 4; i+=4) {
        dst++ = ((1<<shift) - weight[i])src[leftIdx[i]] + weight[i]src[rightIdx[i]];
        dst++ = ((1<<shift) - weight[i+1])src[leftIdx[i+1]] + weight[i+1]src[rightIdx[i+1]];
        dst++ = ((1<<shift) - weight[i+2])src[leftIdx[i+2]] + weight[i+2]src[rightIdx[i+2]];
        dst++ = ((1<<shift) - weight[i+3])src[leftIdx[i+3]] + weight[i+3]*src[rightIdx[i+3]];


}
for( ; i < len; ++i) {
    *dst++ = ((1<<shift) - weight[i])*src[leftIdx[i]] + weight[i]*src[rightIdx[i]];
}

}
define IET_MAX(x,y) (x)>(y)?(x):(y)
define IET_MIN(x,y) (x)>(y)?(y):(x)
define IET_SWAP(x,y,tmp) (tmp)=(x);(x)=(y);(y)=(tmp);
static void ResizeImage(unsigned char pSrc,int src_w,int src_h,
                        unsigned char pDst,int dst_w, int dst_h)
{
    int i, j;
    int sw, sh, sstep;
    int dw, dh, dstep;
    unsigned char sdata, ddata;
    float horScaleRatio, verScaleRatio;
    long rowBuf1, rowBuf2;
    long upLinePtr, downLinePtr, tempPtr;
    long horWeight;
    int horLeftIdx, horRightIdx;
    int preVerUpIdx, preVerDownIdx;
    int shift = 8;

sw=src_w;
sh=src_h;
sstep=24;
sdata=pSrc;
dw=dst_w;
dh=dst_h;
dstep=24;
ddata=pDst;

horScaleRatio = sw / (float)(dw);
verScaleRatio = sh / (float)(dh);

rowBuf1 = new long[dw];
rowBuf2 = new long[dw];
horWeight = new long[dw];
horLeftIdx = new int[dw];
horRightIdx = new int[dw];


//col interpolation

//計算目標圖像像素橫向的左右鄰居序號，和權重。
for(i = 0; i < dw; i++) {
    float pos = (i + 0.5f) * horScaleRatio;
    horLeftIdx[i] = (int)(IET_MAX(pos - 0.5f, 0));
    horRightIdx[i] = (int)(IET_MIN(pos + 0.5f, sw-1));
    horWeight[i] = (long) (fabs(pos - 0.5f - horLeftIdx[i]) * (1<<shift));
}

preVerUpIdx = -1;
preVerDownIdx = -1;
upLinePtr = rowBuf1;
downLinePtr = rowBuf2;
for(j = 0; j < dh; j++) {
    float pos = (j + 0.5f) * verScaleRatio;
    int verUpIdx = (int)(IET_MAX(pos - 0.5f, 0));
    int verDownIdx = (int)(IET_MIN(pos + 0.5f, sh-1));
    long verWeight = (long) (fabs(pos - 0.5f - verUpIdx) * (1<<shift));

    if(verUpIdx == preVerUpIdx && verDownIdx == preVerDownIdx) {
        ;
        //do nothing
    } else if(verUpIdx == preVerDownIdx) {
        IET_SWAP(upLinePtr, downLinePtr, tempPtr);
        _ieInterpImageBilinear8UC1_Ver3_RowFilter(sdata + sstep*verDownIdx, downLinePtr, dw, horLeftIdx, horRightIdx, horWeight, shift);
    } else {
        _ieInterpImageBilinear8UC1_Ver3_RowFilter(sdata + sstep*verUpIdx,   upLinePtr, dw, horLeftIdx, horRightIdx, horWeight, shift);
        _ieInterpImageBilinear8UC1_Ver3_RowFilter(sdata + sstep*verDownIdx, downLinePtr, dw, horLeftIdx, horRightIdx, horWeight, shift);
    }

    unsigned char* _ptr = ddata + dstep*j;
    for(i = 0; i < dw-4; i+=4) {
        *_ptr++ = (unsigned char) ( (((1<<shift) - verWeight)*upLinePtr[i] + verWeight*downLinePtr[i]) >> (2*shift) );
        *_ptr++ = (unsigned char) ( (((1<<shift) - verWeight)*upLinePtr[i+1] + verWeight*downLinePtr[i+1]) >> (2*shift) );
        *_ptr++ = (unsigned char) ( (((1<<shift) - verWeight)*upLinePtr[i+2] + verWeight*downLinePtr[i+2]) >> (2*shift) );
        *_ptr++ = (unsigned char) ( (((1<<shift) - verWeight)*upLinePtr[i+3] + verWeight*downLinePtr[i+3]) >> (2*shift) );
    }
    for(; i < dw; i++) {
        *_ptr++ = (unsigned char) ( (((1<<shift) - verWeight)*upLinePtr[i] + verWeight*downLinePtr[i]) >> (2*shift) );
    }
    preVerUpIdx = verUpIdx;
    preVerDownIdx = verDownIdx;
}
delete []rowBuf1;
delete []rowBuf2;
delete []horWeight;
delete []horLeftIdx;
delete []horRightIdx;

}</pre>