Update freetype to latest version of ASOP.

src/cache/ftccmap.c

Index: src/cache/ftccmap.c
diff --git a/src/cache/ftccmap.c b/src/cache/ftccmap.c
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index 0000000000000000000000000000000000000000..848349be2d1bd6b1f1e175091ea7299b89869b66
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+/***************************************************************************/
+/*                                                                         */
+/*  ftccmap.c                                                              */
+/*                                                                         */
+/*    FreeType CharMap cache (body)                                        */
+/*                                                                         */
+/*  Copyright 2000-2013 by                                                 */
+/*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
+/*                                                                         */
+/*  This file is part of the FreeType project, and may only be used,       */
+/*  modified, and distributed under the terms of the FreeType project      */
+/*  license, LICENSE.TXT.  By continuing to use, modify, or distribute     */
+/*  this file you indicate that you have read the license and              */
+/*  understand and accept it fully.                                        */
+/*                                                                         */
+/***************************************************************************/
+
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_CACHE_H
+#include "ftcmanag.h"
+#include FT_INTERNAL_MEMORY_H
+#include FT_INTERNAL_OBJECTS_H
+#include FT_INTERNAL_DEBUG_H
+
+#include "ftccback.h"
+#include "ftcerror.h"
+
+#undef  FT_COMPONENT
+#define FT_COMPONENT  trace_cache
+
+
+  /*************************************************************************/
+  /*                                                                       */
+  /* Each FTC_CMapNode contains a simple array to map a range of character */
+  /* codes to equivalent glyph indices.                                    */
+  /*                                                                       */
+  /* For now, the implementation is very basic: Each node maps a range of  */
+  /* 128 consecutive character codes to their corresponding glyph indices. */
+  /*                                                                       */
+  /* We could do more complex things, but I don't think it is really very  */
+  /* useful.                                                               */
+  /*                                                                       */
+  /*************************************************************************/
+
+
+  /* number of glyph indices / character code per node */
+#define FTC_CMAP_INDICES_MAX  128
+
+  /* compute a query/node hash */
+#define FTC_CMAP_HASH( faceid, index, charcode )         \
+          ( _FTC_FACE_ID_HASH( faceid ) + 211 * (index) + \
+            ( (charcode) / FTC_CMAP_INDICES_MAX )      )
+
+  /* the charmap query */
+  typedef struct  FTC_CMapQueryRec_
+  {
+    FTC_FaceID  face_id;
+    FT_UInt     cmap_index;
+    FT_UInt32   char_code;
+
+  } FTC_CMapQueryRec, *FTC_CMapQuery;
+
+#define FTC_CMAP_QUERY( x )  ((FTC_CMapQuery)(x))
+#define FTC_CMAP_QUERY_HASH( x )                                         \
+          FTC_CMAP_HASH( (x)->face_id, (x)->cmap_index, (x)->char_code )
+
+  /* the cmap cache node */
+  typedef struct  FTC_CMapNodeRec_
+  {
+    FTC_NodeRec  node;
+    FTC_FaceID   face_id;
+    FT_UInt      cmap_index;
+    FT_UInt32    first;                         /* first character in node */
+    FT_UInt16    indices[FTC_CMAP_INDICES_MAX]; /* array of glyph indices  */
+
+  } FTC_CMapNodeRec, *FTC_CMapNode;
+
+#define FTC_CMAP_NODE( x ) ( (FTC_CMapNode)( x ) )
+#define FTC_CMAP_NODE_HASH( x )                                      \
+          FTC_CMAP_HASH( (x)->face_id, (x)->cmap_index, (x)->first )
+
+  /* if (indices[n] == FTC_CMAP_UNKNOWN), we assume that the corresponding */
+  /* glyph indices haven't been queried through FT_Get_Glyph_Index() yet   */
+#define FTC_CMAP_UNKNOWN  (FT_UInt16)~0
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                        CHARMAP NODES                          *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  FT_CALLBACK_DEF( void )
+  ftc_cmap_node_free( FTC_Node   ftcnode,
+                      FTC_Cache  cache )
+  {
+    FTC_CMapNode  node   = (FTC_CMapNode)ftcnode;
+    FT_Memory     memory = cache->memory;
+
+
+    FT_FREE( node );
+  }
+
+
+  /* initialize a new cmap node */
+  FT_CALLBACK_DEF( FT_Error )
+  ftc_cmap_node_new( FTC_Node   *ftcanode,
+                     FT_Pointer  ftcquery,
+                     FTC_Cache   cache )
+  {
+    FTC_CMapNode  *anode  = (FTC_CMapNode*)ftcanode;
+    FTC_CMapQuery  query  = (FTC_CMapQuery)ftcquery;
+    FT_Error       error;
+    FT_Memory      memory = cache->memory;
+    FTC_CMapNode   node   = NULL;
+    FT_UInt        nn;
+
+
+    if ( !FT_NEW( node ) )
+    {
+      node->face_id    = query->face_id;
+      node->cmap_index = query->cmap_index;
+      node->first      = (query->char_code / FTC_CMAP_INDICES_MAX) *
+                         FTC_CMAP_INDICES_MAX;
+
+      for ( nn = 0; nn < FTC_CMAP_INDICES_MAX; nn++ )
+        node->indices[nn] = FTC_CMAP_UNKNOWN;
+    }
+
+    *anode = node;
+    return error;
+  }
+
+
+  /* compute the weight of a given cmap node */
+  FT_CALLBACK_DEF( FT_Offset )
+  ftc_cmap_node_weight( FTC_Node   cnode,
+                        FTC_Cache  cache )
+  {
+    FT_UNUSED( cnode );
+    FT_UNUSED( cache );
+
+    return sizeof ( *cnode );
+  }
+
+
+  /* compare a cmap node to a given query */
+  FT_CALLBACK_DEF( FT_Bool )
+  ftc_cmap_node_compare( FTC_Node    ftcnode,
+                         FT_Pointer  ftcquery,
+                         FTC_Cache   cache,
+                         FT_Bool*    list_changed )
+  {
+    FTC_CMapNode   node  = (FTC_CMapNode)ftcnode;
+    FTC_CMapQuery  query = (FTC_CMapQuery)ftcquery;
+    FT_UNUSED( cache );
+
+
+    if ( list_changed )
+      *list_changed = FALSE;
+    if ( node->face_id    == query->face_id    &&
+         node->cmap_index == query->cmap_index )
+    {
+      FT_UInt32  offset = (FT_UInt32)( query->char_code - node->first );
+
+
+      return FT_BOOL( offset < FTC_CMAP_INDICES_MAX );
+    }
+
+    return 0;
+  }
+
+
+  FT_CALLBACK_DEF( FT_Bool )
+  ftc_cmap_node_remove_faceid( FTC_Node    ftcnode,
+                               FT_Pointer  ftcface_id,
+                               FTC_Cache   cache,
+                               FT_Bool*    list_changed )
+  {
+    FTC_CMapNode  node    = (FTC_CMapNode)ftcnode;
+    FTC_FaceID    face_id = (FTC_FaceID)ftcface_id;
+    FT_UNUSED( cache );
+
+
+    if ( list_changed )
+      *list_changed = FALSE;
+    return FT_BOOL( node->face_id == face_id );
+  }
+
+
+  /*************************************************************************/
+  /*************************************************************************/
+  /*****                                                               *****/
+  /*****                    GLYPH IMAGE CACHE                          *****/
+  /*****                                                               *****/
+  /*************************************************************************/
+  /*************************************************************************/
+
+
+  FT_CALLBACK_TABLE_DEF
+  const FTC_CacheClassRec  ftc_cmap_cache_class =
+  {
+    ftc_cmap_node_new,
+    ftc_cmap_node_weight,
+    ftc_cmap_node_compare,
+    ftc_cmap_node_remove_faceid,
+    ftc_cmap_node_free,
+
+    sizeof ( FTC_CacheRec ),
+    ftc_cache_init,
+    ftc_cache_done,
+  };
+
+
+  /* documentation is in ftcache.h */
+
+  FT_EXPORT_DEF( FT_Error )
+  FTC_CMapCache_New( FTC_Manager     manager,
+                     FTC_CMapCache  *acache )
+  {
+    return FTC_Manager_RegisterCache( manager,
+                                      &ftc_cmap_cache_class,
+                                      FTC_CACHE_P( acache ) );
+  }
+
+
+  /* documentation is in ftcache.h */
+
+  FT_EXPORT_DEF( FT_UInt )
+  FTC_CMapCache_Lookup( FTC_CMapCache  cmap_cache,
+                        FTC_FaceID     face_id,
+                        FT_Int         cmap_index,
+                        FT_UInt32      char_code )
+  {
+    FTC_Cache         cache = FTC_CACHE( cmap_cache );
+    FTC_CMapQueryRec  query;
+    FTC_Node          node;
+    FT_Error          error;
+    FT_UInt           gindex = 0;
+    FT_PtrDist        hash;
+    FT_Int            no_cmap_change = 0;
+
+
+    if ( cmap_index < 0 )
+    {
+      /* Treat a negative cmap index as a special value, meaning that you */
+      /* don't want to change the FT_Face's character map through this    */
+      /* call.  This can be useful if the face requester callback already */
+      /* sets the face's charmap to the appropriate value.                */
+
+      no_cmap_change = 1;
+      cmap_index     = 0;
+    }
+
+    if ( !cache )
+    {
+      FT_TRACE0(( "FTC_CMapCache_Lookup: bad arguments, returning 0\n" ));
+      return 0;
+    }
+
+    query.face_id    = face_id;
+    query.cmap_index = (FT_UInt)cmap_index;
+    query.char_code  = char_code;
+
+    hash = FTC_CMAP_HASH( face_id, cmap_index, char_code );
+
+#if 1
+    FTC_CACHE_LOOKUP_CMP( cache, ftc_cmap_node_compare, hash, &query,
+                          node, error );
+#else
+    error = FTC_Cache_Lookup( cache, hash, &query, &node );
+#endif
+    if ( error )
+      goto Exit;
+
+    FT_ASSERT( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first ) <
+                FTC_CMAP_INDICES_MAX );
+
+    /* something rotten can happen with rogue clients */
+    if ( (FT_UInt)( char_code - FTC_CMAP_NODE( node )->first >=
+                    FTC_CMAP_INDICES_MAX ) )
+      return 0; /* XXX: should return appropriate error */
+
+    gindex = FTC_CMAP_NODE( node )->indices[char_code -
+                                            FTC_CMAP_NODE( node )->first];
+    if ( gindex == FTC_CMAP_UNKNOWN )
+    {
+      FT_Face  face;
+
+
+      gindex = 0;
+
+      error = FTC_Manager_LookupFace( cache->manager,
+                                      FTC_CMAP_NODE( node )->face_id,
+                                      &face );
+      if ( error )
+        goto Exit;
+
+#ifdef FT_MAX_CHARMAP_CACHEABLE
+      /* something rotten can happen with rogue clients */
+      if ( cmap_index > FT_MAX_CHARMAP_CACHEABLE )
+        return 0; /* XXX: should return appropriate error */
+#endif
+
+      if ( (FT_UInt)cmap_index < (FT_UInt)face->num_charmaps )
+      {
+        FT_CharMap  old, cmap  = NULL;
+
+
+        old  = face->charmap;
+        cmap = face->charmaps[cmap_index];
+
+        if ( old != cmap && !no_cmap_change )
+          FT_Set_Charmap( face, cmap );
+
+        gindex = FT_Get_Char_Index( face, char_code );
+
+        if ( old != cmap && !no_cmap_change )
+          FT_Set_Charmap( face, old );
+      }
+
+      FTC_CMAP_NODE( node )->indices[char_code -
+                                     FTC_CMAP_NODE( node )->first]
+        = (FT_UShort)gindex;
+    }
+
+  Exit:
+    return gindex;
+  }
+
+
+/* END */