static int checkBufYUV()

in tjunittest.c [311:380]

• 64 lines of code
• 18 McCabe index (conditional complexity)

static int checkBufYUV(unsigned char *buf, int w, int h, int subsamp,
                       tjscalingfactor sf)
{
  int row, col;
  int hsf = tjMCUWidth[subsamp] / 8, vsf = tjMCUHeight[subsamp] / 8;
  int pw = PAD(w, hsf), ph = PAD(h, vsf);
  int cw = pw / hsf, ch = ph / vsf;
  int ypitch = PAD(pw, yuvAlign), uvpitch = PAD(cw, yuvAlign);
  int retval = 1;
  int halfway = 16 * sf.num / sf.denom;
  int blocksize = 8 * sf.num / sf.denom;

  for (row = 0; row < ph; row++) {
    for (col = 0; col < pw; col++) {
      unsigned char y = buf[ypitch * row + col];

      if (((row / blocksize) + (col / blocksize)) % 2 == 0) {
        if (row < halfway) CHECKVALMAX(y)
        else CHECKVAL0(y);
      } else {
        if (row < halfway) CHECKVAL(y, 76)
        else CHECKVAL(y, 225);
      }
    }
  }
  if (subsamp != TJSAMP_GRAY) {
    halfway = 16 / vsf * sf.num / sf.denom;

    for (row = 0; row < ch; row++) {
      for (col = 0; col < cw; col++) {
        unsigned char u = buf[ypitch * ph + (uvpitch * row + col)],
          v = buf[ypitch * ph + uvpitch * ch + (uvpitch * row + col)];

        if (((row * vsf / blocksize) + (col * hsf / blocksize)) % 2 == 0) {
          CHECKVAL(u, 128);  CHECKVAL(v, 128);
        } else {
          if (row < halfway) {
            CHECKVAL(u, 85);  CHECKVALMAX(v);
          } else {
            CHECKVAL0(u);  CHECKVAL(v, 149);
          }
        }
      }
    }
  }

bailout:
  if (retval == 0) {
    for (row = 0; row < ph; row++) {
      for (col = 0; col < pw; col++)
        printf("%.3d ", buf[ypitch * row + col]);
      printf("\n");
    }
    printf("\n");
    for (row = 0; row < ch; row++) {
      for (col = 0; col < cw; col++)
        printf("%.3d ", buf[ypitch * ph + (uvpitch * row + col)]);
      printf("\n");
    }
    printf("\n");
    for (row = 0; row < ch; row++) {
      for (col = 0; col < cw; col++)
        printf("%.3d ",
               buf[ypitch * ph + uvpitch * ch + (uvpitch * row + col)]);
      printf("\n");
    }
  }

  return retval;
}