lib/taglobal.h

   1 /* taglobal.h */
   2
   3 /*
   4  * Copyright (C) 2011-2014 by Werner Lemberg.
   5  *
   6  * This file is part of the ttfautohint library, and may only be used,
   7  * modified, and distributed under the terms given in `COPYING'.  By
   8  * continuing to use, modify, or distribute this file you indicate that you
   9  * have read `COPYING' and understand and accept it fully.
  10  *
  11  * The file `COPYING' mentioned in the previous paragraph is distributed
  12  * with the ttfautohint library.
  13  */
  14
  15
  16 /* originally file `afglobal.h' (2011-Mar-28) from FreeType */
  17
  18 /* heavily modified 2011 by Werner Lemberg <wl@gnu.org> */
  19
  20 #ifndef __TAGLOBAL_H__
  21 #define __TAGLOBAL_H__
  22
  23 #include "ta.h"
  24 #include "tatypes.h"
  25
  26
  27 extern TA_WritingSystemClass const ta_writing_system_classes[];
  28 extern TA_StyleClass const ta_style_classes[];
  29
  30
  31 #ifdef TA_DEBUG
  32 extern const char* ta_style_names[];
  33 #endif
  34
  35
  36 /* Default values and flags for both autofitter globals */
  37 /* (originally found in AF_ModuleRec, we use FONT instead) */
  38 /* and face globals (in TA_FaceGlobalsRec). */
  39
  40 /* index of fallback style in `ta_style_classes' */
  41 #define TA_STYLE_FALLBACK TA_STYLE_NONE
  42 /* a bit mask indicating an uncovered glyph */
  43 #define TA_STYLE_UNASSIGNED 0x7F
  44 /* if this flag is set, we have an ASCII digit */
  45 #define TA_DIGIT 0x80
  46
  47 /* `increase-x-height' property */
  48 #define TA_PROP_INCREASE_X_HEIGHT_MIN 6
  49 #define TA_PROP_INCREASE_X_HEIGHT_MAX 0
  50
  51
  52 /* note that glyph_styles[] maps each glyph to an index into the */
  53 /* `ta_style_classes' array. */
  54 typedef struct TA_FaceGlobalsRec_
  55 {
  56   FT_Face face;
  57   FT_Long glyph_count; /* same as face->num_glyphs */
  58   FT_Byte* glyph_styles;
  59
  60   /* per-face auto-hinter properties */
  61   FT_UInt increase_x_height;
  62
  63   TA_StyleMetrics metrics[TA_STYLE_MAX];
  64
  65   FONT* font; /* to access global properties */
  66 } TA_FaceGlobalsRec;
  67
  68
  69 /* this models the global hints data for a given face, */
  70 /* decomposed into style-specific items */
  71
  72 FT_Error
  73 ta_face_globals_new(FT_Face face,
  74                     TA_FaceGlobals *aglobals,
  75                     FONT* font);
  76
  77 FT_Error
  78 ta_face_globals_get_metrics(TA_FaceGlobals globals,
  79                             FT_UInt gindex,
  80                             FT_UInt options,
  81                             TA_StyleMetrics *ametrics);
  82
  83 void
  84 ta_face_globals_free(TA_FaceGlobals globals);
  85
  86 FT_Bool
  87 ta_face_globals_is_digit(TA_FaceGlobals globals,
  88                          FT_UInt gindex);
  89
  90 #endif /* __TAGLOBAL_H__ */
  91
  92 /* end of taglobal.h */