lib/tagloadr.h

   1 /* tagloadr.h */
   2
   3 /*
   4  * Copyright (C) 2011-2013 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 typedef struct TA_SubGlyphRec_
  28 {
  29   FT_Int index;
  30   FT_UShort flags;
  31
  32   FT_Int arg1;
  33   FT_Int arg2;
  34
  35   FT_Matrix transform;
  36 } TA_SubGlyphRec, *TA_SubGlyph;
  37
  38
  39 typedef struct TA_GlyphLoadRec_
  40 {
  41   FT_Outline outline; /* outline */
  42
  43   FT_Vector* extra_points; /* extra points table */
  44   FT_Vector* extra_points2; /* second extra points table */
  45
  46   FT_UInt num_subglyphs; /* number of subglyphs */
  47   TA_SubGlyph subglyphs; /* subglyphs */
  48 } TA_GlyphLoadRec, *TA_GlyphLoad;
  49
  50
  51 typedef struct TA_GlyphLoaderRec_
  52 {
  53   FT_UInt max_points;
  54   FT_UInt max_contours;
  55   FT_UInt max_subglyphs;
  56   FT_Bool use_extra;
  57
  58   TA_GlyphLoadRec base;
  59   TA_GlyphLoadRec current;
  60 } TA_GlyphLoaderRec, *TA_GlyphLoader;
  61
  62
  63 /* create new empty glyph loader */
  64 FT_Error
  65 TA_GlyphLoader_New(TA_GlyphLoader *aloader);
  66
  67 /* add an extra points table to a glyph loader */
  68 FT_Error
  69 TA_GlyphLoader_CreateExtra(TA_GlyphLoader loader);
  70
  71 /* destroy a glyph loader */
  72 void
  73 TA_GlyphLoader_Done(TA_GlyphLoader loader);
  74
  75 /* reset a glyph loader (frees everything int it) */
  76 void
  77 TA_GlyphLoader_Reset(TA_GlyphLoader loader);
  78
  79 /* rewind a glyph loader */
  80 void
  81 TA_GlyphLoader_Rewind(TA_GlyphLoader loader);
  82
  83 /* check that there is enough space to add */
  84 /* `n_points' and `n_contours' to the glyph loader */
  85 FT_Error
  86 TA_GlyphLoader_CheckPoints(TA_GlyphLoader loader,
  87                            FT_UInt n_points,
  88                            FT_UInt n_contours);
  89
  90
  91 #define TA_GLYPHLOADER_CHECK_P(_loader, _count) \
  92    ((_count) == 0 || ((_loader)->base.outline.n_points \
  93                       + (_loader)->current.outline.n_points \
  94                       + (unsigned long)(_count)) <= (_loader)->max_points)
  95
  96 #define TA_GLYPHLOADER_CHECK_C(_loader, _count) \
  97    ((_count) == 0 || ((_loader)->base.outline.n_contours \
  98                       + (_loader)->current.outline.n_contours \
  99                       + (unsigned long)(_count)) <= (_loader)->max_contours)
 100
 101 #define TA_GLYPHLOADER_CHECK_POINTS(_loader, _points, _contours) \
 102    ((TA_GLYPHLOADER_CHECK_P(_loader, _points) \
 103      && TA_GLYPHLOADER_CHECK_C(_loader, _contours)) \
 104     ? 0 \
 105     : TA_GlyphLoader_CheckPoints((_loader), (_points), (_contours)))
 106
 107
 108 /* check that there is enough space to add */
 109 /* `n_subs' sub-glyphs to a glyph loader */
 110 FT_Error
 111 TA_GlyphLoader_CheckSubGlyphs(TA_GlyphLoader loader,
 112                               FT_UInt n_subs);
 113
 114 /* prepare a glyph loader, i.e. empty the current glyph */
 115 void
 116 TA_GlyphLoader_Prepare(TA_GlyphLoader loader);
 117
 118 /* add the current glyph to the base glyph */
 119 void
 120 TA_GlyphLoader_Add(TA_GlyphLoader loader);
 121
 122 /* copy points from one glyph loader to another */
 123 FT_Error
 124 TA_GlyphLoader_CopyPoints(TA_GlyphLoader target,
 125                           TA_GlyphLoader source);
 126
 127 #endif /* __TAGLOADR_H__ */
 128
 129 /* end of tagloadr.h */