[692] | 1 | /***************************************************************************/
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| 2 | /* */
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| 3 | /* ftcglyph.h */
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| 4 | /* */
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| 5 | /* FreeType abstract glyph cache (specification). */
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| 6 | /* */
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| 7 | /* Copyright 2000-2001, 2003, 2004 by */
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| 8 | /* David Turner, Robert Wilhelm, and Werner Lemberg. */
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| 9 | /* */
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| 10 | /* This file is part of the FreeType project, and may only be used, */
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| 11 | /* modified, and distributed under the terms of the FreeType project */
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| 12 | /* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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| 13 | /* this file you indicate that you have read the license and */
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| 14 | /* understand and accept it fully. */
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| 15 | /* */
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| 16 | /***************************************************************************/
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| 17 |
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| 18 |
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| 19 | /*
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| 20 | *
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| 21 | * FTC_GCache is an _abstract_ cache object optimized to store glyph
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| 22 | * data. It works as follows:
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| 23 | *
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| 24 | * - It manages FTC_GNode objects. Each one of them can hold one or more
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| 25 | * glyph `items'. Item types are not specified in the FTC_GCache but
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| 26 | * in classes that extend it.
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| 27 | *
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| 28 | * - Glyph attributes, like face ID, character size, render mode, etc.,
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| 29 | * can be grouped into abstract `glyph families'. This avoids storing
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| 30 | * the attributes within the FTC_GCache, since it is likely that many
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| 31 | * FTC_GNodes will belong to the same family in typical uses.
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| 32 | *
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| 33 | * - Each FTC_GNode is thus an FTC_Node with two additional fields:
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| 34 | *
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| 35 | * * gindex: A glyph index, or the first index in a glyph range.
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| 36 | * * family: A pointer to a glyph `family'.
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| 37 | *
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| 38 | * - Family types are not fully specific in the FTC_Family type, but
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| 39 | * by classes that extend it.
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| 40 | *
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| 41 | * Note that both FTC_ImageCache and FTC_SBitCache extend FTC_GCache.
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| 42 | * They share an FTC_Family sub-class called FTC_BasicFamily which is
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| 43 | * used to store the following data: face ID, pixel/point sizes, load
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| 44 | * flags. For more details see the file `src/cache/ftcbasic.c'.
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| 45 | *
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| 46 | * Client applications can extend FTC_GNode with their own FTC_GNode
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| 47 | * and FTC_Family sub-classes to implement more complex caches (e.g.,
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| 48 | * handling automatic synthesis, like obliquing & emboldening, colored
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| 49 | * glyphs, etc.).
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| 50 | *
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| 51 | * See also the FTC_ICache & FTC_SCache classes in `ftcimage.h' and
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| 52 | * `ftcsbits.h', which both extend FTC_GCache with additional
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| 53 | * optimizations.
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| 54 | *
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| 55 | * A typical FTC_GCache implementation must provide at least the
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| 56 | * following:
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| 57 | *
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| 58 | * - FTC_GNode sub-class, e.g. MyNode, with relevant methods:
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| 59 | * my_node_new (must call FTC_GNode_Init)
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| 60 | * my_node_free (must call FTC_GNode_Done)
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| 61 | * my_node_compare (must call FTC_GNode_Compare)
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| 62 | * my_node_remove_faceid (must call ftc_gnode_unselect in case
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| 63 | * of match)
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| 64 | *
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| 65 | * - FTC_Family sub-class, e.g. MyFamily, with relevant methods:
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| 66 | * my_family_compare
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| 67 | * my_family_init
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| 68 | * my_family_reset (optional)
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| 69 | * my_family_done
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| 70 | *
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| 71 | * - FTC_GQuery sub-class, e.g. MyQuery, to hold cache-specific query
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| 72 | * data.
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| 73 | *
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| 74 | * - Constant structures for a FTC_GNodeClass.
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| 75 | *
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| 76 | * - MyCacheNew() can be implemented easily as a call to the convenience
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| 77 | * function FTC_GCache_New.
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| 78 | *
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| 79 | * - MyCacheLookup with a call to FTC_GCache_Lookup. This function will
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| 80 | * automatically:
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| 81 | *
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| 82 | * - Search for the corresponding family in the cache, or create
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| 83 | * a new one if necessary. Put it in FTC_GQUERY(myquery).family
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| 84 | *
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| 85 | * - Call FTC_Cache_Lookup.
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| 86 | *
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| 87 | * If it returns NULL, you should create a new node, then call
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| 88 | * ftc_cache_add as usual.
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| 89 | */
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| 90 |
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| 91 |
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| 92 | /*************************************************************************/
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| 93 | /* */
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| 94 | /* Important: The functions defined in this file are only used to */
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| 95 | /* implement an abstract glyph cache class. You need to */
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| 96 | /* provide additional logic to implement a complete cache. */
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| 97 | /* */
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| 98 | /*************************************************************************/
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| 99 |
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| 100 |
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| 101 | /*************************************************************************/
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| 102 | /*************************************************************************/
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| 103 | /*************************************************************************/
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| 104 | /*************************************************************************/
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| 105 | /*************************************************************************/
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| 106 | /********* *********/
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| 107 | /********* WARNING, THIS IS BETA CODE. *********/
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| 108 | /********* *********/
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| 109 | /*************************************************************************/
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| 110 | /*************************************************************************/
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| 111 | /*************************************************************************/
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| 112 | /*************************************************************************/
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| 113 | /*************************************************************************/
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| 114 |
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| 115 |
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| 116 | #ifndef __FTCGLYPH_H__
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| 117 | #define __FTCGLYPH_H__
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| 118 |
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| 119 |
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| 120 | #include <ft2build.h>
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| 121 | #include FT_CACHE_INTERNAL_MANAGER_H
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| 122 |
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| 123 |
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| 124 | FT_BEGIN_HEADER
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| 125 |
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| 126 |
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| 127 | /*
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| 128 | * We can group glyphs into `families'. Each family correspond to a
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| 129 | * given face ID, character size, transform, etc.
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| 130 | *
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| 131 | * Families are implemented as MRU list nodes. They are
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| 132 | * reference-counted.
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| 133 | */
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| 134 |
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| 135 | typedef struct FTC_FamilyRec_
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| 136 | {
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| 137 | FTC_MruNodeRec mrunode;
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| 138 | FT_UInt num_nodes; /* current number of nodes in this family */
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| 139 | FTC_Cache cache;
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| 140 | FTC_MruListClass clazz;
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| 141 |
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| 142 | } FTC_FamilyRec, *FTC_Family;
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| 143 |
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| 144 | #define FTC_FAMILY(x) ( (FTC_Family)(x) )
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| 145 | #define FTC_FAMILY_P(x) ( (FTC_Family*)(x) )
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| 146 |
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| 147 |
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| 148 | typedef struct FTC_GNodeRec_
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| 149 | {
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| 150 | FTC_NodeRec node;
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| 151 | FTC_Family family;
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| 152 | FT_UInt gindex;
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| 153 |
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| 154 | } FTC_GNodeRec, *FTC_GNode;
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| 155 |
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| 156 | #define FTC_GNODE( x ) ( (FTC_GNode)(x) )
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| 157 | #define FTC_GNODE_P( x ) ( (FTC_GNode*)(x) )
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| 158 |
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| 159 |
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| 160 | typedef struct FTC_GQueryRec_
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| 161 | {
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| 162 | FT_UInt gindex;
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| 163 | FTC_Family family;
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| 164 |
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| 165 | } FTC_GQueryRec, *FTC_GQuery;
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| 166 |
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| 167 | #define FTC_GQUERY( x ) ( (FTC_GQuery)(x) )
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| 168 |
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| 169 |
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| 170 | /*************************************************************************/
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| 171 | /* */
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| 172 | /* These functions are exported so that they can be called from */
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| 173 | /* user-provided cache classes; otherwise, they are really part of the */
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| 174 | /* cache sub-system internals. */
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| 175 | /* */
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| 176 |
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| 177 | /* must be called by derived FTC_Node_InitFunc routines */
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| 178 | FT_EXPORT( void )
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| 179 | FTC_GNode_Init( FTC_GNode node,
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| 180 | FT_UInt gindex, /* glyph index for node */
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| 181 | FTC_Family family );
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| 182 |
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| 183 | /* returns TRUE iff the query's glyph index correspond to the node; */
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| 184 | /* this assumes that the "family" and "hash" fields of the query are */
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| 185 | /* already correctly set */
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| 186 | FT_EXPORT( FT_Bool )
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| 187 | FTC_GNode_Compare( FTC_GNode gnode,
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| 188 | FTC_GQuery gquery );
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| 189 |
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| 190 | /* call this function to clear a node's family -- this is necessary */
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| 191 | /* to implement the `node_remove_faceid' cache method correctly */
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| 192 | FT_EXPORT( void )
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| 193 | FTC_GNode_UnselectFamily( FTC_GNode gnode,
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| 194 | FTC_Cache cache );
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| 195 |
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| 196 | /* must be called by derived FTC_Node_DoneFunc routines */
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| 197 | FT_EXPORT( void )
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| 198 | FTC_GNode_Done( FTC_GNode node,
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| 199 | FTC_Cache cache );
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| 200 |
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| 201 |
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| 202 | FT_EXPORT( void )
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| 203 | FTC_Family_Init( FTC_Family family,
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| 204 | FTC_Cache cache );
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| 205 |
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| 206 | typedef struct FTC_GCacheRec_
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| 207 | {
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| 208 | FTC_CacheRec cache;
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| 209 | FTC_MruListRec families;
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| 210 |
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| 211 | } FTC_GCacheRec, *FTC_GCache;
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| 212 |
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| 213 | #define FTC_GCACHE( x ) ((FTC_GCache)(x))
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| 214 |
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| 215 |
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| 216 | /* can be used as @FTC_Cache_InitFunc */
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| 217 | FT_EXPORT( FT_Error )
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| 218 | FTC_GCache_Init( FTC_GCache cache );
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| 219 |
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| 220 |
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| 221 | /* can be used as @FTC_Cache_DoneFunc */
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| 222 | FT_EXPORT( void )
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| 223 | FTC_GCache_Done( FTC_GCache cache );
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| 224 |
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| 225 |
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| 226 | /* the glyph cache class adds fields for the family implementation */
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| 227 | typedef struct FTC_GCacheClassRec_
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| 228 | {
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| 229 | FTC_CacheClassRec clazz;
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| 230 | FTC_MruListClass family_class;
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| 231 |
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| 232 | } FTC_GCacheClassRec;
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| 233 |
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| 234 | typedef const FTC_GCacheClassRec* FTC_GCacheClass;
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| 235 |
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| 236 | #define FTC_GCACHE_CLASS( x ) ((FTC_GCacheClass)(x))
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| 237 |
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| 238 | #define FTC_CACHE__GCACHE_CLASS( x ) \
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| 239 | FTC_GCACHE_CLASS( FTC_CACHE(x)->org_class )
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| 240 | #define FTC_CACHE__FAMILY_CLASS( x ) \
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| 241 | ( (FTC_MruListClass)FTC_CACHE__GCACHE_CLASS( x )->family_class )
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| 242 |
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| 243 |
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| 244 | /* convenience function; use it instead of FTC_Manager_Register_Cache */
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| 245 | FT_EXPORT( FT_Error )
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| 246 | FTC_GCache_New( FTC_Manager manager,
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| 247 | FTC_GCacheClass clazz,
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| 248 | FTC_GCache *acache );
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| 249 |
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| 250 | FT_EXPORT( FT_Error )
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| 251 | FTC_GCache_Lookup( FTC_GCache cache,
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| 252 | FT_UInt32 hash,
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| 253 | FT_UInt gindex,
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| 254 | FTC_GQuery query,
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| 255 | FTC_Node *anode );
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| 256 |
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| 257 |
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| 258 | /* */
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| 259 |
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| 260 |
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| 261 | #define FTC_FAMILY_FREE( family, cache ) \
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| 262 | FTC_MruList_Remove( &FTC_GCACHE((cache))->families, \
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| 263 | (FTC_MruNode)(family) )
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| 264 |
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| 265 |
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| 266 | #ifdef FTC_INLINE
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| 267 |
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| 268 | #define FTC_GCACHE_LOOKUP_CMP( cache, famcmp, nodecmp, hash, \
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| 269 | gindex, query, node, error ) \
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| 270 | FT_BEGIN_STMNT \
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| 271 | FTC_GCache _gcache = FTC_GCACHE( cache ); \
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| 272 | FTC_GQuery _gquery = (FTC_GQuery)( query ); \
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| 273 | FTC_MruNode_CompareFunc _fcompare = (FTC_MruNode_CompareFunc)(famcmp); \
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| 274 | \
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| 275 | \
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| 276 | _gquery->gindex = (gindex); \
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| 277 | \
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| 278 | FTC_MRULIST_LOOKUP_CMP( &_gcache->families, _gquery, _fcompare, \
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| 279 | _gquery->family, error ); \
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| 280 | if ( !error ) \
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| 281 | { \
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| 282 | FTC_Family _gqfamily = _gquery->family; \
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| 283 | \
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| 284 | \
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| 285 | _gqfamily->num_nodes++; \
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| 286 | \
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| 287 | FTC_CACHE_LOOKUP_CMP( cache, nodecmp, hash, query, node, error ); \
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| 288 | \
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| 289 | if ( --_gqfamily->num_nodes == 0 ) \
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| 290 | FTC_FAMILY_FREE( _gqfamily, _gcache ); \
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| 291 | } \
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| 292 | FT_END_STMNT
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| 293 | /* */
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| 294 |
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| 295 | #else /* !FTC_INLINE */
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| 296 |
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| 297 | #define FTC_GCACHE_LOOKUP_CMP( cache, famcmp, nodecmp, hash, \
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| 298 | gindex, query, node, error ) \
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| 299 | FT_BEGIN_STMNT \
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| 300 | error = FTC_GCache_Lookup( FTC_GCACHE( cache ), hash, gindex, \
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| 301 | FTC_GQUERY( query ), (FTC_Node*)&(node) ); \
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| 302 | FT_END_STMNT
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| 303 |
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| 304 | #endif /* !FTC_INLINE */
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| 305 |
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| 306 |
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| 307 | FT_END_HEADER
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| 308 |
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| 309 |
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| 310 | #endif /* __FTCGLYPH_H__ */
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| 311 |
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| 312 |
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| 313 | /* END */
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