| public jpeg_add_quant_table ( int which_tbl, int basic_table, int scale_factor, bool force_baseline ) : void | ||
| which_tbl | int | Indicates which table slot to fill. |
| basic_table | int | An array of 64 unsigned integers given in normal array order.
/// These values are multiplied by /// The basic table should be given in JPEG zigzag order. /// |
| scale_factor | int | Multiplier for values in |
| force_baseline | bool | Defines range of values in |
| return | void | |
public void jpeg_add_quant_table(int which_tbl, int[] basic_table, int scale_factor, bool force_baseline)
{
/* Safety check to ensure start_compress not called yet. */
if (m_global_state != JpegState.CSTATE_START)
ERREXIT(J_MESSAGE_CODE.JERR_BAD_STATE, (int)m_global_state);
if (which_tbl < 0 || which_tbl >= JpegConstants.NUM_QUANT_TBLS)
ERREXIT(J_MESSAGE_CODE.JERR_DQT_INDEX, which_tbl);
if (m_quant_tbl_ptrs[which_tbl] == null)
m_quant_tbl_ptrs[which_tbl] = new JQUANT_TBL();
for (int i = 0; i < JpegConstants.DCTSIZE2; i++)
{
int temp = (basic_table[i] * scale_factor + 50) / 100;
/* limit the values to the valid range */
if (temp <= 0)
temp = 1;
/* max quantizer needed for 12 bits */
if (temp > 32767)
temp = 32767;
/* limit to baseline range if requested */
if (force_baseline && temp > 255)
temp = 255;
m_quant_tbl_ptrs[which_tbl].quantval[i] = (short)temp;
}
/* Initialize sent_table false so table will be written to JPEG file. */
m_quant_tbl_ptrs[which_tbl].Sent_table = false;
}
