137 	tile_has_diff = (unsigned char *)  in initialize_tiles()
161 	if (tile_has_diff) {  in free_tiles()
162 		free(tile_has_diff);  in free_tiles()
163 		tile_has_diff = NULL;  in free_tiles()
595 			if (tile_has_diff[n]) {  in hint_updates()
1769 		tile_has_diff[n] = 0;  in copy_tiles()
1861 			tile_has_diff[n+(t-1)] = 0;  in copy_tiles()
1872 				tile_has_diff[n+(t-1)] = 0;  in copy_tiles()
1874 				tile_has_diff[n+(t-1)] = 1;  in copy_tiles()
2070 			if (tile_has_diff[n]) {  in copy_all_tiles()
2074 			if (! tile_has_diff[n]) {  in copy_all_tiles()
2086 				if (! tile_has_diff[m]) {  in copy_all_tiles()
2087 					tile_has_diff[m] = 2;  in copy_all_tiles()
2093 				if (! tile_has_diff[m]) {  in copy_all_tiles()
2094 					tile_has_diff[m] = 2;  in copy_all_tiles()
2118 			if (x != ntiles_x && tile_has_diff[n]) {  in copy_all_tile_runs()
2139 						if (! tile_has_diff[m]) {  in copy_all_tile_runs()
2140 							tile_has_diff[m] = 2;  in copy_all_tile_runs()
2149 					if (! tile_has_diff[m]) {  in copy_all_tile_runs()
2150 						tile_has_diff[m] = 2;  in copy_all_tile_runs()
2190 		if (! tile_has_diff[n]) {  in copy_tiles_backward_pass()
2196 		if (y >= 1 && ! tile_has_diff[m] && tile_region[n].top_diff) {  in copy_tiles_backward_pass()
2198 				tile_has_diff[m] = 2;  in copy_tiles_backward_pass()
2206 		if (x >= 1 && ! tile_has_diff[m] && tile_region[n].left_diff) {  in copy_tiles_backward_pass()
2208 				tile_has_diff[m] = 2;  in copy_tiles_backward_pass()
2216 		if (tile_has_diff[n]) {  in copy_tiles_backward_pass()
2233 			if (! tile_has_diff[n]) {  in copy_tiles_additional_pass()
2245 		if (tile_has_diff[n]) {  in copy_tiles_additional_pass()
2257 	if (! tile_has_diff[n]) {  in gap_try()
2324 		if (tile_has_diff[n]) {  in fill_tile_gaps()
2337 	if (tile_has_diff[n]) {  in island_try()
2343 	if (tile_has_diff[n] && ! tile_has_diff[m]) {  in island_try()
2389 		if (tile_has_diff[n]) {  in grow_islands()
2848 			if (tile_has_diff[n]) {  in print_tiles()
2860 		prev[n] = tile_has_diff[n];  in print_tiles()
3047 		tile_has_diff[n] = 0;  in blackout_line_skip()
3077 				tile_has_diff[n] = 0;  in blackout_line_skip()
3079 				*tile_count += tile_has_diff[n];  in blackout_line_skip()
3295 				if (nodiffs || tile_has_diff[n]) {  in scan_display()
3296 					tile_count += tile_has_diff[n];  in scan_display()
3320 					tile_has_diff[n] = 1;  in scan_display()
3325 						tile_has_diff[n] = 0;  in scan_display()
3327 						tile_has_diff[n] = 1;  in scan_display()
3374 		tile_has_diff[i] = 0;  in scan_for_updates()
3469 			if (tile_has_diff[i]) {  in scan_for_updates()
3473 				tile_has_diff[i] = 1;  in scan_for_updates()
3660 					tile_has_diff[n] = 0;  in scan_for_updates()