kopia lustrzana https://gitlab.com/sane-project/backends
coolscan2: average multiple samples
rodzic
2385657904
commit
4126b6796d
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@ -1494,9 +1494,10 @@ sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
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SANE_Status status;
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ssize_t xfer_len_in, xfer_len_line, xfer_len_out;
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unsigned long index;
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int colour;
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int colour, n_colours, sample_pass;
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uint8_t *s8 = NULL;
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uint16_t *s16 = NULL;
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double m_avg_sum;
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SANE_Byte *line_buf_new;
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DBG (10, "sane_read() called, maxlen = %i.\n", maxlen);
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@ -1586,6 +1587,9 @@ sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
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s->n_line_buf = xfer_len_line;
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}
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/* adapt for multi-sampling */
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xfer_len_in *= s->samples_per_scan;
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cs2_scanner_ready (s, CS2_STATUS_READY);
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cs2_init_buffer (s);
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cs2_parse_cmd (s, "28 00 00 00 00 00");
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@ -1602,24 +1606,44 @@ sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
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return status;
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}
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n_colours = s->n_colour_out +
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(s->infrared_stage == CS2_INFRARED_IN ? 1 : 0);
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for (index = 0; index < s->logical_width; index++)
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for (colour = 0;
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colour < s->n_colour_out + (s->infrared_stage ==
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CS2_INFRARED_IN ? 1 : 0); colour++)
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for (colour = 0; colour < n_colours; colour++) {
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m_avg_sum = 0.0;
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switch (s->bytes_per_pixel)
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{
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case 1:
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/* calculate target address */
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if ((s->infrared_stage == CS2_INFRARED_IN)
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&& (colour == s->n_colour_out))
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s8 = (uint8_t *) & (s->infrared_buf[s->infrared_index++]);
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else
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s8 =
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(uint8_t *) & (s->line_buf[s->n_colour_out * index + colour]);
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if (s->samples_per_scan > 1)
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{
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/* calculate average of multi samples */
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for (sample_pass = 0;
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sample_pass < s->samples_per_scan;
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sample_pass++)
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m_avg_sum += (double)
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s->recv_buf[s->logical_width *
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(sample_pass * n_colours + colour) +
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(colour + 1) * s->odd_padding + index];
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*s8 = (uint8_t) (m_avg_sum / s->samples_per_scan + 0.5);
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}
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else
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/* shortcut for single sample */
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*s8 =
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s->recv_buf[colour * s->logical_width +
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(colour + 1) * s->odd_padding + index];
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break;
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case 2:
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/* calculate target address */
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if ((s->infrared_stage == CS2_INFRARED_IN)
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&& (colour == s->n_colour_out))
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s16 =
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@ -1629,6 +1653,21 @@ sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
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(uint16_t *) & (s->
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line_buf[2 *
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(s->n_colour_out * index + colour)]);
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if (s->samples_per_scan > 1)
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{
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/* calculate average of multi samples */
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for (sample_pass = 0;
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s->samples_per_scan > 1 && sample_pass < s->samples_per_scan;
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sample_pass++)
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m_avg_sum += (double)
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(s->recv_buf[2 * (s->logical_width * (sample_pass * n_colours + colour) + index)] * 256 +
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s->recv_buf[2 * (s->logical_width * (sample_pass * n_colours + colour) + index) + 1]);
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*s16 = (uint16_t) (m_avg_sum / s->samples_per_scan + 0.5);
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}
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else
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/* shortcut for single sample */
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*s16 =
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s->recv_buf[2 * (colour * s->logical_width + index)] * 256 +
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s->recv_buf[2 * (colour * s->logical_width + index) + 1];
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@ -1640,6 +1679,7 @@ sane_read (SANE_Handle h, SANE_Byte * buf, SANE_Int maxlen, SANE_Int * len)
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return SANE_STATUS_INVAL;
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break;
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}
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}
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s->xfer_position += xfer_len_line;
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xfer_len_out = xfer_len_line;
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