src/main/dither-eventone.c

93       stpi_dither_channel_t *dc = et->dummy_channel;
94       shade_distance_t *shade = (shade_distance_t *) dc->aux_data;
96       STP_SAFE_FREE(dc->aux_data);
97       stpi_dither_channel_destroy(dc);
121       stpi_dither_channel_t *dc = stp_zalloc(sizeof(stpi_dither_channel_t));
122       stp_dither_matrix_clone(&(d->dither_matrix), &(dc->dithermat), 0, 0);
127       stp_dither_matrix_clone(&(et->transition_matrix), &(dc->pick), 0, 0);
128       dc->error_rows = 1;
129       dc->errs = stp_zalloc(1 * sizeof(int *));
130       dc->errs[0] = stp_zalloc(size * sizeof(int));
131       et->dummy_channel = dc;
240 eventone_update(stpi_dither_channel_t *dc, eventone_t *et,
243   shade_distance_t *sp = (shade_distance_t *) dc->aux_data;
261 diffuse_error(stpi_dither_channel_t *dc, eventone_t *et, int x, int direction)
270   /*  int fraction = (dc->v + (et->diff_factor>>1)) / et->diff_factor; */
271   int frac_2 = dc->v + dc->v;
272   int frac_3 = frac_2 + dc->v;
273   dc->errs[0][x + MAX_SPREAD] = frac_3;
274   dc->errs[0][x + MAX_SPREAD - direction] += frac_2;
275   dc->v -= (frac_2 + frac_3) / 16;
277   dc->errs[0][x + MAX_SPREAD] = dc->v * 3;
278   dc->errs[0][x + MAX_SPREAD - direction] += dc->v * 5;
279   dc->errs[0][x + MAX_SPREAD - (direction * 2)] += dc->v * 1;
280   dc->v -= dc->v * 9 / 16;
285 eventone_adjust(stpi_dither_channel_t *dc, eventone_t *et, int dither_point,
296       shade_distance_t *shade = (shade_distance_t *) dc->aux_data;
307 unitone_adjust(stpi_dither_channel_t *dc, eventone_t *et,
318       shade_distance_t *shade = (shade_distance_t *) dc->aux_data;
327 find_segment(stpi_dither_channel_t *dc, unsigned inkval,
333   if (dc->nlevels == 1)
335       upper->bits = dc->ink_list[1].bits;
336       upper->range = dc->ink_list[1].value;
343       for (i=0, ip = dc->ink_list; i < dc->nlevels - 1; i++, ip++)
357 find_segment_and_ditherpoint(stpi_dither_channel_t *dc, unsigned inkval,
360   find_segment(dc, inkval, lower, upper);
466 	      stpi_dither_channel_t *dc = &CHANNEL(d, i);
467 	      shade_distance_t *sp = (shade_distance_t *) dc->aux_data;
480 		find_segment_and_ditherpoint(dc, raw[i], &lower, &upper);
483 	      dc->v += 2 * range_point + (dc->errs[0][x + MAX_SPREAD] + 8) / 16;
484 	      inkspot = dc->v - range_point;
486 	      point_error += eventone_adjust(dc, et, inkspot, range_point);
494 		  dc->v -= 131070;
503 		      set_row_ends(dc, x);
506 		      print_ink(d, dc->ptr, inkp, bit, length);
511 	      eventone_update(dc, et, x, direction);
512 	      diffuse_error(dc, et, x, direction);
605 	  stpi_dither_channel_t *dc = &CHANNEL(d, i);
606 	  if (dc->ptr)
608 	      shade_distance_t *sp = (shade_distance_t *) dc->aux_data;
618 	      dc->b = find_segment_and_ditherpoint(dc, raw[i],
622 		  if (dc->b > maximum_value)
623 		    maximum_value = dc->b;
624 		  ddc->b += dc->b;
627 	      dc->v += 2 * dc->b + (dc->errs[0][x + MAX_SPREAD] + 8) / 16;
628 	      dc->o = unitone_adjust(dc, et, dc->v - dc->b, dc->b);
657 	      stpi_dither_channel_t *dc = &CHANNEL(d, i);
658 	      shade_distance_t *sp = (shade_distance_t *) dc->aux_data;
660 	      if (dc->ptr)
665 		      if (dc->o > best_channel_value)
668 			  best_channel = dc;
670 			  if (dc->o >= 32768)
673 			    best_channel_value = dc->o;
675 		      else if (dc->o > second_best_channel_value)
677 			  second_best_channel = dc;
678 			  if (dc->o >= 32768)
681 			    second_best_channel_value = dc->o;
690 	  stpi_dither_channel_t *dc = &CHANNEL(d, i);
691 	  if (dc->ptr)
694 	      shade_distance_t *sp = (shade_distance_t *) dc->aux_data;
697 	      if (dc->o < 0)
698 		dc->o = 0;
699 	      else if (dc->o > 65535)
700 		dc->o = 65535;
703 		  point_error += dc->o;
708 		      dc->v -= 131070;
712 	      else if ((channels_to_print >= 1 && best_channel == dc) ||
713 		       (channels_to_print >= 2 && second_best_channel == dc))
716 		  dc->v -= 131070;
723 		      set_row_ends(dc, x);
726 		      print_ink(d, dc->ptr, inkp, bit, length);
742 	  stpi_dither_channel_t *dc = &CHANNEL(d, i);
743 	  if (dc->ptr)
746 	      eventone_update(dc, et, x, direction);
747 	      diffuse_error(dc, et, x, direction);