331 lines
10 KiB
C
331 lines
10 KiB
C
/***************************************************************************/
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/* */
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/* ftccmap.c */
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/* */
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/* FreeType CharMap cache (body) */
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/* */
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/* Copyright 2000-2015 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_CACHE_H
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#include "ftcmanag.h"
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_OBJECTS_H
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#include FT_INTERNAL_DEBUG_H
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#include "ftccback.h"
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#include "ftcerror.h"
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_cache
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/*************************************************************************/
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/* */
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/* Each FTC_CMapNode contains a simple array to map a range of character */
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/* codes to equivalent glyph indices. */
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/* */
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/* For now, the implementation is very basic: Each node maps a range of */
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/* 128 consecutive character codes to their corresponding glyph indices. */
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/* */
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/* We could do more complex things, but I don't think it is really very */
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/* useful. */
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/* */
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/*************************************************************************/
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/* number of glyph indices / character code per node */
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#define FTC_CMAP_INDICES_MAX 128
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/* compute a query/node hash */
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#define FTC_CMAP_HASH( faceid, index, charcode ) \
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( _FTC_FACE_ID_HASH( faceid ) + 211 * (index) + \
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( (charcode) / FTC_CMAP_INDICES_MAX ) )
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/* the charmap query */
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typedef struct FTC_CMapQueryRec_
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{
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FTC_FaceID face_id;
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FT_UInt cmap_index;
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FT_UInt32 char_code;
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} FTC_CMapQueryRec, *FTC_CMapQuery;
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#define FTC_CMAP_QUERY( x ) ((FTC_CMapQuery)(x))
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/* the cmap cache node */
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typedef struct FTC_CMapNodeRec_
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{
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FTC_NodeRec node;
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FTC_FaceID face_id;
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FT_UInt cmap_index;
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FT_UInt32 first; /* first character in node */
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FT_UInt16 indices[FTC_CMAP_INDICES_MAX]; /* array of glyph indices */
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} FTC_CMapNodeRec, *FTC_CMapNode;
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#define FTC_CMAP_NODE( x ) ( (FTC_CMapNode)( x ) )
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/* if (indices[n] == FTC_CMAP_UNKNOWN), we assume that the corresponding */
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/* glyph indices haven't been queried through FT_Get_Glyph_Index() yet */
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#define FTC_CMAP_UNKNOWN (FT_UInt16)~0
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** CHARMAP NODES *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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FT_CALLBACK_DEF( void )
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ftc_cmap_node_free( FTC_Node ftcnode,
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FTC_Cache cache )
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{
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FTC_CMapNode node = (FTC_CMapNode)ftcnode;
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FT_Memory memory = cache->memory;
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FT_FREE( node );
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}
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/* initialize a new cmap node */
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FT_CALLBACK_DEF( FT_Error )
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ftc_cmap_node_new( FTC_Node *ftcanode,
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FT_Pointer ftcquery,
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FTC_Cache cache )
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{
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FTC_CMapNode *anode = (FTC_CMapNode*)ftcanode;
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FTC_CMapQuery query = (FTC_CMapQuery)ftcquery;
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FT_Error error;
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FT_Memory memory = cache->memory;
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FTC_CMapNode node = NULL;
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FT_UInt nn;
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if ( !FT_NEW( node ) )
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{
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node->face_id = query->face_id;
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node->cmap_index = query->cmap_index;
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node->first = (query->char_code / FTC_CMAP_INDICES_MAX) *
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FTC_CMAP_INDICES_MAX;
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for ( nn = 0; nn < FTC_CMAP_INDICES_MAX; nn++ )
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node->indices[nn] = FTC_CMAP_UNKNOWN;
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}
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*anode = node;
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return error;
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}
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/* compute the weight of a given cmap node */
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FT_CALLBACK_DEF( FT_Offset )
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ftc_cmap_node_weight( FTC_Node cnode,
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FTC_Cache cache )
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{
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FT_UNUSED( cnode );
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FT_UNUSED( cache );
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return sizeof ( *cnode );
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}
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/* compare a cmap node to a given query */
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FT_CALLBACK_DEF( FT_Bool )
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ftc_cmap_node_compare( FTC_Node ftcnode,
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FT_Pointer ftcquery,
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FTC_Cache cache,
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FT_Bool* list_changed )
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{
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FTC_CMapNode node = (FTC_CMapNode)ftcnode;
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FTC_CMapQuery query = (FTC_CMapQuery)ftcquery;
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FT_UNUSED( cache );
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if ( list_changed )
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*list_changed = FALSE;
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if ( node->face_id == query->face_id &&
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node->cmap_index == query->cmap_index )
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{
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FT_UInt32 offset = (FT_UInt32)( query->char_code - node->first );
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return FT_BOOL( offset < FTC_CMAP_INDICES_MAX );
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}
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return 0;
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}
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FT_CALLBACK_DEF( FT_Bool )
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ftc_cmap_node_remove_faceid( FTC_Node ftcnode,
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FT_Pointer ftcface_id,
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FTC_Cache cache,
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FT_Bool* list_changed )
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{
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FTC_CMapNode node = (FTC_CMapNode)ftcnode;
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FTC_FaceID face_id = (FTC_FaceID)ftcface_id;
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FT_UNUSED( cache );
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if ( list_changed )
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*list_changed = FALSE;
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return FT_BOOL( node->face_id == face_id );
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}
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** GLYPH IMAGE CACHE *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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static
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const FTC_CacheClassRec ftc_cmap_cache_class =
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{
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ftc_cmap_node_new,
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ftc_cmap_node_weight,
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ftc_cmap_node_compare,
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ftc_cmap_node_remove_faceid,
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ftc_cmap_node_free,
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sizeof ( FTC_CacheRec ),
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ftc_cache_init,
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ftc_cache_done,
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};
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/* documentation is in ftcache.h */
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FT_EXPORT_DEF( FT_Error )
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FTC_CMapCache_New( FTC_Manager manager,
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FTC_CMapCache *acache )
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{
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return FTC_Manager_RegisterCache( manager,
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&ftc_cmap_cache_class,
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FTC_CACHE_P( acache ) );
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}
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/* documentation is in ftcache.h */
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FT_EXPORT_DEF( FT_UInt )
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FTC_CMapCache_Lookup( FTC_CMapCache cmap_cache,
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FTC_FaceID face_id,
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FT_Int cmap_index,
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FT_UInt32 char_code )
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{
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FTC_Cache cache = FTC_CACHE( cmap_cache );
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FTC_CMapQueryRec query;
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FTC_Node node;
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FT_Error error;
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FT_UInt gindex = 0;
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FT_Offset hash;
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FT_Int no_cmap_change = 0;
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if ( cmap_index < 0 )
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{
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/* Treat a negative cmap index as a special value, meaning that you */
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/* don't want to change the FT_Face's character map through this */
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/* call. This can be useful if the face requester callback already */
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/* sets the face's charmap to the appropriate value. */
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no_cmap_change = 1;
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cmap_index = 0;
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}
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if ( !cache )
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{
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FT_TRACE0(( "FTC_CMapCache_Lookup: bad arguments, returning 0\n" ));
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return 0;
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}
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if ( !face_id )
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return 0;
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query.face_id = face_id;
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query.cmap_index = (FT_UInt)cmap_index;
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query.char_code = char_code;
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hash = FTC_CMAP_HASH( face_id, (FT_UInt)cmap_index, char_code );
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#if 1
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FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, &query,
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node, error );
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#else
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error = FTC_Cache_Lookup( cache, hash, &query, &node );
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#endif
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if ( error )
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goto Exit;
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FT_ASSERT( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first ) <
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FTC_CMAP_INDICES_MAX );
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/* something rotten can happen with rogue clients */
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if ( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first >=
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FTC_CMAP_INDICES_MAX ) )
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return 0; /* XXX: should return appropriate error */
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gindex = FTC_CMAP_NODE( node )->indices[char_code -
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FTC_CMAP_NODE( node )->first];
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if ( gindex == FTC_CMAP_UNKNOWN )
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{
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FT_Face face;
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gindex = 0;
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error = FTC_Manager_LookupFace( cache->manager,
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FTC_CMAP_NODE( node )->face_id,
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&face );
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if ( error )
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goto Exit;
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if ( (FT_UInt)cmap_index < (FT_UInt)face->num_charmaps )
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{
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FT_CharMap old, cmap = NULL;
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old = face->charmap;
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cmap = face->charmaps[cmap_index];
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if ( old != cmap && !no_cmap_change )
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FT_Set_Charmap( face, cmap );
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gindex = FT_Get_Char_Index( face, char_code );
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if ( old != cmap && !no_cmap_change )
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FT_Set_Charmap( face, old );
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}
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FTC_CMAP_NODE( node )->indices[char_code -
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FTC_CMAP_NODE( node )->first]
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= (FT_UShort)gindex;
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}
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Exit:
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return gindex;
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}
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/* END */
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