static int checkBufYUV()

in java/TJUnitTest.java [556:646]
87 lines of code
24 McCabe index (conditional complexity)

  static int checkBufYUV(byte[] buf, int size, int w, int h, int subsamp,
                         TJScalingFactor sf) throws Exception {
    int row, col;
    int hsf = TJ.getMCUWidth(subsamp) / 8, vsf = TJ.getMCUHeight(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 correctsize = ypitch * ph +
                      (subsamp == TJ.SAMP_GRAY ? 0 : uvpitch * ch * 2);
    int halfway = 16 * sf.getNum() / sf.getDenom();
    int blockSize = 8 * sf.getNum() / sf.getDenom();

    try {
      if (size != correctsize)
        throw new Exception("Incorrect size " + size + ".  Should be " +
                            correctsize);

      for (row = 0; row < ph; row++) {
        for (col = 0; col < pw; col++) {
          byte y = buf[ypitch * row + col];
          if (((row / blockSize) + (col / blockSize)) % 2 == 0) {
            if (row < halfway)
              checkValMax(row, col, y, "Y");
            else
              checkVal0(row, col, y, "Y");
          } else {
            if (row < halfway)
              checkVal(row, col, y, "Y", 76);
            else
              checkVal(row, col, y, "Y", 226);
          }
        }
      }
      if (subsamp != TJ.SAMP_GRAY) {
        halfway = 16 / vsf * sf.getNum() / sf.getDenom();
        for (row = 0; row < ch; row++) {
          for (col = 0; col < cw; col++) {
            byte 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(row, col, u, "U", 128);
              checkVal(row, col, v, "V", 128);
            } else {
              if (row < halfway) {
                checkVal(row, col, u, "U", 85);
                checkValMax(row, col, v, "V");
              } else {
                checkVal0(row, col, u, "U");
                checkVal(row, col, v, "V", 149);
              }
            }
          }
        }
      }
    } catch (Exception e) {
      System.out.println("\n" + e.getMessage());
      retval = 0;
    }

    if (retval == 0) {
      for (row = 0; row < ph; row++) {
        for (col = 0; col < pw; col++) {
          int y = buf[ypitch * row + col];
          if (y < 0) y += 256;
          System.out.format("%3d ", y);
        }
        System.out.print("\n");
      }
      System.out.print("\n");
      for (row = 0; row < ch; row++) {
        for (col = 0; col < cw; col++) {
          int u = buf[ypitch * ph + (uvpitch * row + col)];
          if (u < 0) u += 256;
          System.out.format("%3d ", u);
        }
        System.out.print("\n");
      }
      System.out.print("\n");
      for (row = 0; row < ch; row++) {
        for (col = 0; col < cw; col++) {
          int v = buf[ypitch * ph + uvpitch * ch + (uvpitch * row + col)];
          if (v < 0) v += 256;
          System.out.format("%3d ", v);
        }
        System.out.print("\n");
      }
    }

    return retval;
  }