diff options
| -rw-r--r-- | [GSoC]ChangeLog | 12 | ||||
| -rw-r--r-- | src/sdf/ftbsdf.c | 97 |
2 files changed, 106 insertions, 3 deletions
diff --git a/[GSoC]ChangeLog b/[GSoC]ChangeLog index ae4cae034..9d15fea09 100644 --- a/[GSoC]ChangeLog +++ b/[GSoC]ChangeLog @@ -1,5 +1,17 @@ 2020-07-27 Anuj Verma <anujv@iitbhilai.ac.in> + [sdf -> bsdf] Added edge detection algorithm. + + Added edge detection algorithm. It works by checking + the neighboring pixels and if any neighbor is not + filled (i.e. belongs to background) we mark the + pixel as edge by setting it's distance to 0. + + * src/sdf/ftbsdf.c (bsdf_is_edge): Added function to + detect if the pixel is an edge. + +2020-07-27 Anuj Verma <anujv@iitbhilai.ac.in> + [sdf -> bsdf] Added the second pass of the '8SED'. Added the second pass of the 8SED algorithm. The second pass diff --git a/src/sdf/ftbsdf.c b/src/sdf/ftbsdf.c index caa1acfb5..004346a04 100644 --- a/src/sdf/ftbsdf.c +++ b/src/sdf/ftbsdf.c @@ -85,6 +85,94 @@ /************************************************************************** * * @Function: + * bsdf_is_edge + * + * @Description: + * [TODO] + * + * @Input: + * [TODO] + * + * @Return: + * [TODO] + */ + static FT_Bool + bsdf_is_edge( FT_Byte* s, /* source bitmap */ + FT_Int x, /* x index of point to check */ + FT_Int y, /* y index of point to check */ + FT_Int w, /* width */ + FT_Int r ) /* rows */ + { + FT_Bool is_edge = 0; + FT_Byte* to_check = NULL; + FT_Int num_neighbour = 0; + + if ( y == 7 && x == 20 ) + to_check = NULL; + + if ( *s == 0 ) + goto Done; + + /* up */ + if ( y > 0 ) + { + num_neighbour++; + to_check = s - w; + if ( *to_check == 0 ) + { + is_edge = 1; + goto Done; + } + } + + /* down */ + if ( y < r - 2 ) + { + num_neighbour++; + to_check = s + w; + if ( *to_check == 0 ) + { + is_edge = 1; + goto Done; + } + } + + /* left */ + if ( x > 0 ) + { + num_neighbour++; + to_check = s - 1; + if ( *to_check == 0 ) + { + is_edge = 1; + goto Done; + } + } + + /* right */ + if ( x < w - 2 ) + { + num_neighbour++; + to_check = s + 1; + if ( *to_check == 0 ) + { + is_edge = 1; + goto Done; + } + } + + + + if ( num_neighbour != 4 ) + is_edge = 1; + + Done: + return is_edge; + } + + /************************************************************************** + * + * @Function: * bsdf_init_distance_map * * @Description: @@ -233,19 +321,22 @@ pixel_value <<= 8; #else - if ( pixel_value ) + if ( bsdf_is_edge( s + s_index , s_i, s_j, s_width, s_rows ) ) { t[t_index].dist = 0; - t[t_index].sign = 1; } else { t[t_index].near.x = FT_INT_MAX; t[t_index].near.y = FT_INT_MAX; t[t_index].dist = 128 * ONE; - t[t_index].sign = -1; } + if ( pixel_value ) + t[t_index].sign = 1; + else + t[t_index].sign = -1; + #endif } } |