1 /*
2  * Copyright (C) 2009 Grigori Goronzy <greg@geekmind.org>
3  *
4  * This file is part of libass.
5  *
6  * Permission to use, copy, modify, and distribute this software for any
7  * purpose with or without fee is hereby granted, provided that the above
8  * copyright notice and this permission notice appear in all copies.
9  *
10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17  */
18 
19 #ifndef LIBASS_DRAWING_H
20 #define LIBASS_DRAWING_H
21 
22 #include <ft2build.h>
23 #include FT_OUTLINE_H
24 
25 #include "ass.h"
26 
27 #define DRAWING_INITIAL_SIZE 256
28 
29 typedef enum {
30     TOKEN_MOVE,
31     TOKEN_MOVE_NC,
32     TOKEN_LINE,
33     TOKEN_CUBIC_BEZIER,
34     TOKEN_CONIC_BEZIER,
35     TOKEN_B_SPLINE,
36     TOKEN_EXTEND_SPLINE,
37     TOKEN_CLOSE
38 } ASS_TokenType;
39 
40 typedef struct ass_drawing_token {
41     ASS_TokenType type;
42     FT_Vector point;
43     struct ass_drawing_token *next;
44     struct ass_drawing_token *prev;
45 } ASS_DrawingToken;
46 
47 typedef struct {
48     char *text; // drawing string
49     int i;      // text index
50     int scale;  // scale (1-64) for subpixel accuracy
51     double pbo; // drawing will be shifted in y direction by this amount
52     double scale_x;     // FontScaleX
53     double scale_y;     // FontScaleY
54     int asc;            // ascender
55     int desc;           // descender
56     FT_Outline outline; // target outline
57     FT_Vector advance;  // advance (from cbox)
58     int hash;           // hash value (for caching)
59 
60     // private
61     FT_Library ftlibrary;   // needed for font ops
62     ASS_Library *library;
63     int size;           // current buffer size
64     ASS_DrawingToken *tokens;    // tokenized drawing
65     int max_points;     // current maximum size
66     int max_contours;
67     double point_scale_x;
68     double point_scale_y;
69     FT_BBox cbox;   // bounding box, or let's say... VSFilter's idea of it
70 } ASS_Drawing;
71 
72 ASS_Drawing *ass_drawing_new(ASS_Library *lib, FT_Library ftlib);
73 void ass_drawing_free(ASS_Drawing* drawing);
74 void ass_drawing_add_char(ASS_Drawing* drawing, char symbol);
75 void ass_drawing_hash(ASS_Drawing* drawing);
76 FT_Outline *ass_drawing_parse(ASS_Drawing *drawing, int raw_mode);
77 
78 #endif /* LIBASS_DRAWING_H */
79