src/hb-old/harfbuzz-shaper-private.h

   1 /*
   2  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
   3  *
   4  * This is part of HarfBuzz, an OpenType Layout engine library.
   5  *
   6  * Permission is hereby granted, without written agreement and without
   7  * license or royalty fees, to use, copy, modify, and distribute this
   8  * software and its documentation for any purpose, provided that the
   9  * above copyright notice and the following two paragraphs appear in
  10  * all copies of this software.
  11  *
  12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
  13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
  14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
  15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
  16  * DAMAGE.
  17  *
  18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
  19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
  20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
  21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
  22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
  23  */
  24
  25 #ifndef HARFBUZZ_SHAPER_PRIVATE_H
  26 #define HARFBUZZ_SHAPER_PRIVATE_H
  27
  28 HB_BEGIN_HEADER
  29
  30 enum {
  31     C_DOTTED_CIRCLE = 0x25CC
  32 };
  33
  34 typedef enum
  35 {
  36     HB_Combining_BelowLeftAttached       = 200,
  37     HB_Combining_BelowAttached           = 202,
  38     HB_Combining_BelowRightAttached      = 204,
  39     HB_Combining_LeftAttached            = 208,
  40     HB_Combining_RightAttached           = 210,
  41     HB_Combining_AboveLeftAttached       = 212,
  42     HB_Combining_AboveAttached           = 214,
  43     HB_Combining_AboveRightAttached      = 216,
  44
  45     HB_Combining_BelowLeft               = 218,
  46     HB_Combining_Below                   = 220,
  47     HB_Combining_BelowRight              = 222,
  48     HB_Combining_Left                    = 224,
  49     HB_Combining_Right                   = 226,
  50     HB_Combining_AboveLeft               = 228,
  51     HB_Combining_Above                   = 230,
  52     HB_Combining_AboveRight              = 232,
  53
  54     HB_Combining_DoubleBelow             = 233,
  55     HB_Combining_DoubleAbove             = 234,
  56     HB_Combining_IotaSubscript           = 240
  57 } HB_CombiningClass;
  58
  59 typedef enum {
  60     LocaProperty = 0x1,
  61     CcmpProperty = 0x2,
  62     InitProperty = 0x4,
  63     IsolProperty = 0x8,
  64     FinaProperty = 0x10,
  65     MediProperty = 0x20,
  66     RligProperty = 0x40,
  67     CaltProperty = 0x80,
  68     LigaProperty = 0x100,
  69     DligProperty = 0x200,
  70     CswhProperty = 0x400,
  71     MsetProperty = 0x800,
  72
  73     /* used by indic and myanmar shaper */
  74     NuktaProperty = 0x8,
  75     AkhantProperty = 0x10,
  76     RephProperty = 0x20,
  77     PreFormProperty = 0x40,
  78     BelowFormProperty = 0x80,
  79     AboveFormProperty = 0x100,
  80     HalfFormProperty = 0x200,
  81     PostFormProperty = 0x400,
  82     ConjunctFormProperty = 0x800,
  83     VattuProperty = 0x1000,
  84     PreSubstProperty = 0x2000,
  85     BelowSubstProperty = 0x4000,
  86     AboveSubstProperty = 0x8000,
  87     PostSubstProperty = 0x10000,
  88     HalantProperty = 0x20000,
  89     CligProperty = 0x40000,
  90     IndicCaltProperty = 0x80000
  91
  92 } HB_OpenTypeProperty;
  93
  94 /* return true if ok. */
  95 typedef HB_Bool (*HB_ShapeFunction)(HB_ShaperItem *shaper_item);
  96
  97 typedef struct {
  98     HB_ShapeFunction shape;
  99 } HB_ScriptEngine;
 100
 101 extern const HB_ScriptEngine hb_scriptEngines[];
 102
 103 extern HB_Bool HB_BasicShape(HB_ShaperItem *shaper_item);
 104 extern HB_Bool HB_GreekShape(HB_ShaperItem *shaper_item);
 105 extern HB_Bool HB_TibetanShape(HB_ShaperItem *shaper_item);
 106 extern HB_Bool HB_HebrewShape(HB_ShaperItem *shaper_item);
 107 extern HB_Bool HB_ArabicShape(HB_ShaperItem *shaper_item);
 108 extern HB_Bool HB_HangulShape(HB_ShaperItem *shaper_item);
 109 extern HB_Bool HB_MyanmarShape(HB_ShaperItem *shaper_item);
 110 extern HB_Bool HB_KhmerShape(HB_ShaperItem *shaper_item);
 111 extern HB_Bool HB_IndicShape(HB_ShaperItem *shaper_item);
 112
 113 typedef struct {
 114     hb_uint32 tag;
 115     hb_uint32 property;
 116 } HB_OpenTypeFeature;
 117
 118 #define PositioningProperties 0x80000000
 119
 120 HB_Bool HB_SelectScript(HB_ShaperItem *item, const HB_OpenTypeFeature *features);
 121
 122 HB_Bool HB_OpenTypeShape(HB_ShaperItem *item, const hb_uint32 *properties);
 123 HB_Bool HB_OpenTypePosition(HB_ShaperItem *item, int availableGlyphs, HB_Bool doLogClusters);
 124
 125 void HB_HeuristicPosition(HB_ShaperItem *item);
 126 void HB_HeuristicSetGlyphAttributes(HB_ShaperItem *item);
 127
 128 #define HB_IsControlChar(uc) \
 129     ((uc >= 0x200b && uc <= 0x200f /* ZW Space, ZWNJ, ZWJ, LRM and RLM */) \
 130      || (uc >= 0x2028 && uc <= 0x202f /* LS, PS, LRE, RLE, PDF, LRO, RLO, NNBSP */) \
 131      || (uc >= 0x206a && uc <= 0x206f /* ISS, ASS, IAFS, AFS, NADS, NODS */))
 132
 133 HB_Bool HB_ConvertStringToGlyphIndices(HB_ShaperItem *shaper_item);
 134
 135 #define HB_GetGlyphAdvances(shaper_item) \
 136     shaper_item->font->klass->getGlyphAdvances(shaper_item->font, \
 137                                                shaper_item->glyphs, shaper_item->num_glyphs, \
 138                                                shaper_item->advances, \
 139                                                shaper_item->face->current_flags);
 140
 141 #define HB_DECLARE_STACKARRAY(Type, Name) \
 142     Type stack##Name[512]; \
 143     Type *Name = stack##Name;
 144
 145 #define HB_INIT_STACKARRAY(Type, Name, Length) \
 146     if ((Length) >= 512) \
 147         Name = (Type *)malloc((Length) * sizeof(Type));
 148
 149 #define HB_STACKARRAY(Type, Name, Length) \
 150     HB_DECLARE_STACKARRAY(Type, Name) \
 151     HB_INIT_STACKARRAY(Type, Name, Length)
 152
 153 #define HB_FREE_STACKARRAY(Name) \
 154     if (stack##Name != Name) \
 155         free(Name);
 156
 157 HB_END_HEADER
 158
 159 #endif