static int setCompDefaults(struct jpeg_compress_struct *cinfo, int pixelFormat,
                           int subsamp, int jpegQual, int flags)
{
  int retval = 0;
  char *env = NULL;

  cinfo->in_color_space = pf2cs[pixelFormat];
  cinfo->input_components = tjPixelSize[pixelFormat];
  jpeg_set_defaults(cinfo);

#ifndef NO_GETENV
  if ((env = getenv("TJ_OPTIMIZE")) != NULL && strlen(env) > 0 &&
      !strcmp(env, "1"))
    cinfo->optimize_coding = TRUE;
  if ((env = getenv("TJ_ARITHMETIC")) != NULL && strlen(env) > 0 &&
      !strcmp(env, "1"))
    cinfo->arith_code = TRUE;
  if ((env = getenv("TJ_RESTART")) != NULL && strlen(env) > 0) {
    int temp = -1;
    char tempc = 0;

    if (sscanf(env, "%d%c", &temp, &tempc) >= 1 && temp >= 0 &&
        temp <= 65535) {
      if (toupper(tempc) == 'B') {
        cinfo->restart_interval = temp;
        cinfo->restart_in_rows = 0;
      } else
        cinfo->restart_in_rows = temp;
    }
  }
#endif

  if (jpegQual >= 0) {
    jpeg_set_quality(cinfo, jpegQual, TRUE);
    if (jpegQual >= 96 || flags & TJFLAG_ACCURATEDCT)
      cinfo->dct_method = JDCT_ISLOW;
    else
      cinfo->dct_method = JDCT_FASTEST;
  }
  if (subsamp == TJSAMP_GRAY)
    jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
  else if (pixelFormat == TJPF_CMYK)
    jpeg_set_colorspace(cinfo, JCS_YCCK);
  else
    jpeg_set_colorspace(cinfo, JCS_YCbCr);

  if (flags & TJFLAG_PROGRESSIVE)
    jpeg_simple_progression(cinfo);
#ifndef NO_GETENV
  else if ((env = getenv("TJ_PROGRESSIVE")) != NULL && strlen(env) > 0 &&
           !strcmp(env, "1"))
    jpeg_simple_progression(cinfo);
#endif

  cinfo->comp_info[0].h_samp_factor = tjMCUWidth[subsamp] / 8;
  cinfo->comp_info[1].h_samp_factor = 1;
  cinfo->comp_info[2].h_samp_factor = 1;
  if (cinfo->num_components > 3)
    cinfo->comp_info[3].h_samp_factor = tjMCUWidth[subsamp] / 8;
  cinfo->comp_info[0].v_samp_factor = tjMCUHeight[subsamp] / 8;
  cinfo->comp_info[1].v_samp_factor = 1;
  cinfo->comp_info[2].v_samp_factor = 1;
  if (cinfo->num_components > 3)
    cinfo->comp_info[3].v_samp_factor = tjMCUHeight[subsamp] / 8;

  return retval;
}
Unknown