src/main/dither-eventone.c

81   eventone_t *et = (eventone_t *) (d->aux_data);
91   if (et->dummy_channel)
93       stpi_dither_channel_t *dc = et->dummy_channel;
98       STP_SAFE_FREE(et->dummy_channel);
101     stp_dither_matrix_destroy(&(et->transition_matrix));
102   STP_SAFE_FREE(et);
110   eventone_t *et = stp_zalloc(sizeof(eventone_t));
123       et->transition = 0.7;
124       stp_dither_matrix_destroy(&(et->transition_matrix));
125       stp_dither_matrix_copy(&(d->dither_matrix), &(et->transition_matrix));
126       stp_dither_matrix_scale_exponentially(&(et->transition_matrix), et->transition);
127       stp_dither_matrix_clone(&(et->transition_matrix), &(dc->pick), 0, 0);
131       et->dummy_channel = dc;
137   et->d_sq.dx = xa * xa;
138   et->d2x = 2 * et->d_sq.dx;
143   et->d_sq.dy = ya * ya;
144   et->d2y = 2 * et->d_sq.dy;
146   et->aspect = EVEN_C2 / (xa * ya);
147   et->unitone_aspect = UNITONE_C2 / (xa * ya);
148   et->d_sq.r_sq = 0;
154       shade->dis = et->d_sq;
161 	shade->et_dis[x] = et->d_sq;
164   if (et->dummy_channel)
168       shade->dis = et->d_sq;
171 	shade->et_dis[x] = et->d_sq;
172       et->dummy_channel->aux_data = shade;
175   et->physical_aspect = d->y_aspect / d->x_aspect;
176   if (et->physical_aspect >= 4)
177     et->physical_aspect = 4;
178   else if (et->physical_aspect >= 2)
179     et->physical_aspect = 2;
180   else et->physical_aspect = 1;
182   et->diff_factor = diff_factors[et->physical_aspect];
184   d->aux_data = et;
192   eventone_t *et;
196   et = (eventone_t *) (d->aux_data);
212       if (et->dummy_channel)
213 	memset(et->dummy_channel->errs[0], 0, d->dst_width * sizeof(int));
220   if (et->dummy_channel)
221     et->dummy_channel->v = 0;
226 advance_eventone_pre(shade_distance_t *sp, eventone_t *et, int x)
233       sp->dis.dx += et->d2x;
240 eventone_update(stpi_dither_channel_t *dc, eventone_t *et,
253   etd->dy += et->d2y;
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; */
285 eventone_adjust(stpi_dither_channel_t *dc, eventone_t *et, int dither_point,
297       dither_point += shade->dis.r_sq * et->aspect - (EVEN_C1 * 65535) / desired;
307 unitone_adjust(stpi_dither_channel_t *dc, eventone_t *et,
319       dither_point += shade->dis.r_sq * et->unitone_aspect -
410   eventone_t *et;
425   et = (eventone_t *) d->aux_data;
427     stp_dither_matrix_set_row(&(et->transition_matrix), row);
471 	      advance_eventone_pre(sp, et, x);
486 	      point_error += eventone_adjust(dc, et, inkspot, range_point);
495 		  sp->dis = et->d_sq;
511 	      eventone_update(dc, et, x, direction);
512 	      diffuse_error(dc, et, x, direction);
533   eventone_t *et;
555   et = (eventone_t *) d->aux_data;
556   ddc = et->dummy_channel;
601       advance_eventone_pre(ssp, et, x);
610 	      advance_eventone_pre(sp, et, x);
628 	      dc->o = unitone_adjust(dc, et, dc->v - dc->b, dc->b);
649       total_error += eventone_adjust(ddc, et, ddc->v - ddc->b, ddc->b);
709 		      sp->dis = et->d_sq;
717 		  sp->dis = et->d_sq;
735 	  ssp->dis = et->d_sq;
738       eventone_update(ddc, et, x, direction);
739       diffuse_error(ddc, et, x, direction);
746 	      eventone_update(dc, et, x, direction);
747 	      diffuse_error(dc, et, x, direction);