libass/ass_drawing.h

   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 */