///////////////////////////////////缩放图像  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          //计算目标图像像素横向的左右邻居序号，和权重。      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;  }