lib/tagloadr.h

   1 /* tagloadr.h */
   2
   3 /*
   4  * Copyright (C) 2011-2021 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 `ftgloadr.h' (2011-Mar-28) from FreeType */
  17
  18 /* heavily modified 2011 by Werner Lemberg <wl@gnu.org> */
  19
  20 #ifndef TAGLOADR_H_
  21 #define TAGLOADR_H_
  22
  23 #include <ft2build.h>
  24 #include FT_FREETYPE_H
  25
  26
  27 #ifdef __cplusplus
  28 extern "C" {
  29 #endif
  30
  31 typedef struct TA_SubGlyphRec_
  32 {
  33   FT_Int index;
  34   FT_UShort flags;
  35
  36   FT_Int arg1;
  37   FT_Int arg2;
  38
  39   FT_Matrix transform;
  40 } TA_SubGlyphRec, *TA_SubGlyph;
  41
  42
  43 typedef struct TA_GlyphLoadRec_
  44 {
  45   FT_Outline outline; /* outline */
  46
  47   FT_Vector* extra_points; /* extra points table */
  48   FT_Vector* extra_points2; /* second extra points table */
  49
  50   FT_UInt num_subglyphs; /* number of subglyphs */
  51   TA_SubGlyph subglyphs; /* subglyphs */
  52 } TA_GlyphLoadRec, *TA_GlyphLoad;
  53
  54
  55 typedef struct TA_GlyphLoaderRec_
  56 {
  57   FT_UInt max_points;
  58   FT_UInt max_contours;
  59   FT_UInt max_subglyphs;
  60   FT_Bool use_extra;
  61
  62   TA_GlyphLoadRec base;
  63   TA_GlyphLoadRec current;
  64 } TA_GlyphLoaderRec, *TA_GlyphLoader;
  65
  66
  67 /* create new empty glyph loader */
  68 FT_Error
  69 TA_GlyphLoader_New(TA_GlyphLoader *aloader);
  70
  71 /* add an extra points table to a glyph loader */
  72 FT_Error
  73 TA_GlyphLoader_CreateExtra(TA_GlyphLoader loader);
  74
  75 /* destroy a glyph loader */
  76 void
  77 TA_GlyphLoader_Done(TA_GlyphLoader loader);
  78
  79 /* reset a glyph loader (frees everything int it) */
  80 void
  81 TA_GlyphLoader_Reset(TA_GlyphLoader loader);
  82
  83 /* rewind a glyph loader */
  84 void
  85 TA_GlyphLoader_Rewind(TA_GlyphLoader loader);
  86
  87 /* check that there is enough space to add */
  88 /* `n_points' and `n_contours' to the glyph loader */
  89 FT_Error
  90 TA_GlyphLoader_CheckPoints(TA_GlyphLoader loader,
  91                            FT_UInt n_points,
  92                            FT_UInt n_contours);
  93
  94
  95 #define TA_GLYPHLOADER_CHECK_P(_loader, _count) \
  96    ((_count) == 0 \
  97     || ((FT_UInt)(_loader)->base.outline.n_points \
  98         + (FT_UInt)(_loader)->current.outline.n_points \
  99         + (FT_UInt)(_count)) <= (_loader)->max_points)
 100
 101 #define TA_GLYPHLOADER_CHECK_C(_loader, _count) \
 102    ((_count) == 0 \
 103     || ((FT_UInt)(_loader)->base.outline.n_contours \
 104         + (FT_UInt)(_loader)->current.outline.n_contours \
 105         + (FT_UInt)(_count)) <= (_loader)->max_contours)
 106
 107 #define TA_GLYPHLOADER_CHECK_POINTS(_loader, _points, _contours) \
 108    ((TA_GLYPHLOADER_CHECK_P(_loader, _points) \
 109      && TA_GLYPHLOADER_CHECK_C(_loader, _contours)) \
 110     ? 0 \
 111     : TA_GlyphLoader_CheckPoints((_loader), \
 112                                  (FT_UInt)(_points), \
 113                                  (FT_UInt)(_contours)))
 114
 115
 116 /* check that there is enough space to add */
 117 /* `n_subs' sub-glyphs to a glyph loader */
 118 FT_Error
 119 TA_GlyphLoader_CheckSubGlyphs(TA_GlyphLoader loader,
 120                               FT_UInt n_subs);
 121
 122 /* prepare a glyph loader, i.e. empty the current glyph */
 123 void
 124 TA_GlyphLoader_Prepare(TA_GlyphLoader loader);
 125
 126 /* add the current glyph to the base glyph */
 127 void
 128 TA_GlyphLoader_Add(TA_GlyphLoader loader);
 129
 130 /* copy points from one glyph loader to another */
 131 FT_Error
 132 TA_GlyphLoader_CopyPoints(TA_GlyphLoader target,
 133                           TA_GlyphLoader source);
 134
 135 #ifdef __cplusplus
 136 }
 137 #endif
 138
 139 #endif /* TAGLOADR_H_ */
 140
 141 /* end of tagloadr.h */