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freetype2/src/cache/ftcmanag.c

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/***************************************************************************/
/* */
/* ftcmanag.c */
/* */
/* FreeType Cache Manager (body). */
/* */
/* Copyright 2000-2001 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_CACHE_H
#include FT_CACHE_MANAGER_H
#include FT_CACHE_INTERNAL_LRU_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_H
#include FT_LIST_H
#include FT_SIZES_H
#include "ftcerror.h"
#undef FT_COMPONENT
#define FT_COMPONENT trace_cache
#define FTC_LRU_GET_MANAGER( lru ) ( (FTC_Manager)(lru)->user_data )
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FACE LRU IMPLEMENTATION *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct FTC_FaceNodeRec_* FTC_FaceNode;
typedef struct FTC_SizeNodeRec_* FTC_SizeNode;
typedef struct FTC_FaceNodeRec_
{
FT_LruNodeRec lru;
FT_Face face;
} FTC_FaceNodeRec;
typedef struct FTC_SizeNodeRec_
{
FT_LruNodeRec lru;
FT_Size size;
} FTC_SizeNodeRec;
FT_CALLBACK_DEF( FT_Error )
ftc_face_node_init( FTC_FaceNode node,
FTC_FaceID face_id,
FT_LruList list )
{
FTC_Manager manager = FTC_LRU_GET_MANAGER( list );
FT_Error error;
error = manager->request_face( face_id,
manager->library,
manager->request_data,
&node->face );
if ( !error )
{
/* destroy initial size object; it will be re-created later */
if ( node->face->size )
FT_Done_Size( node->face->size );
}
return error;
}
/* helper function for ftc_manager_done_face() */
FT_CALLBACK_DEF( FT_Bool )
ftc_size_node_select( FTC_SizeNode node,
FT_Face face )
{
return FT_BOOL( node->size->face == face );
}
FT_CALLBACK_DEF( void )
ftc_face_node_done( FTC_FaceNode node,
FT_LruList list )
{
FTC_Manager manager = FTC_LRU_GET_MANAGER( list );
FT_Face face = node->face;
/* we must begin by removing all sizes for the target face */
/* from the manager's list */
FT_LruList_Remove_Selection( manager->sizes_list,
(FT_LruNode_SelectFunc)ftc_size_node_select,
face );
/* all right, we can discard the face now */
FT_Done_Face( face );
node->face = NULL;
}
FT_CALLBACK_TABLE_DEF
const FT_LruList_ClassRec ftc_face_list_class =
{
sizeof ( FT_LruListRec ),
(FT_LruList_InitFunc) 0,
(FT_LruList_DoneFunc) 0,
sizeof ( FTC_FaceNodeRec ),
(FT_LruNode_InitFunc) ftc_face_node_init,
(FT_LruNode_DoneFunc) ftc_face_node_done,
(FT_LruNode_FlushFunc) 0, /* no flushing needed */
(FT_LruNode_CompareFunc)0, /* direct comparison of FTC_FaceID handles */
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** SIZES LRU IMPLEMENTATION *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct FTC_SizeQueryRec_
{
FT_Face face;
FT_UInt width;
FT_UInt height;
} FTC_SizeQueryRec, *FTC_SizeQuery;
FT_CALLBACK_DEF( FT_Error )
ftc_size_node_init( FTC_SizeNode node,
FTC_SizeQuery query )
{
FT_Face face = query->face;
FT_Size size;
FT_Error error;
node->size = NULL;
error = FT_New_Size( face, &size );
if ( !error )
{
FT_Activate_Size( size );
error = FT_Set_Pixel_Sizes( query->face,
query->width,
query->height );
if ( error )
FT_Done_Size( size );
else
node->size = size;
}
return error;
}
FT_CALLBACK_DEF( void )
ftc_size_node_done( FTC_SizeNode node )
{
if ( node->size )
{
FT_Done_Size( node->size );
node->size = NULL;
}
}
FT_CALLBACK_DEF( FT_Error )
ftc_size_node_flush( FTC_SizeNode node,
FTC_SizeQuery query )
{
FT_Size size = node->size;
FT_Error error;
if ( size->face == query->face )
{
FT_Activate_Size( size );
error = FT_Set_Pixel_Sizes( query->face, query->width, query->height );
if ( error )
{
FT_Done_Size( size );
node->size = NULL;
}
}
else
{
FT_Done_Size( size );
node->size = NULL;
error = ftc_size_node_init( node, query );
}
return error;
}
FT_CALLBACK_DEF( FT_Bool )
ftc_size_node_compare( FTC_SizeNode node,
FTC_SizeQuery query )
{
FT_Size size = node->size;
return FT_BOOL( size->face == query->face &&
(FT_UInt)size->metrics.x_ppem == query->width &&
(FT_UInt)size->metrics.y_ppem == query->height );
}
FT_CALLBACK_TABLE_DEF
const FT_LruList_ClassRec ftc_size_list_class =
{
sizeof ( FT_LruListRec ),
(FT_LruList_InitFunc) 0,
(FT_LruList_DoneFunc) 0,
sizeof ( FTC_SizeNodeRec ),
(FT_LruNode_InitFunc) ftc_size_node_init,
(FT_LruNode_DoneFunc) ftc_size_node_done,
(FT_LruNode_FlushFunc) ftc_size_node_flush,
(FT_LruNode_CompareFunc)ftc_size_node_compare
};
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** CACHE MANAGER ROUTINES *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
/* documentation is in ftcache.h */
FT_EXPORT_DEF( FT_Error )
FTC_Manager_New( FT_Library library,
FT_UInt max_faces,
FT_UInt max_sizes,
FT_ULong max_bytes,
FTC_Face_Requester requester,
FT_Pointer req_data,
FTC_Manager *amanager )
{
FT_Error error;
FT_Memory memory;
FTC_Manager manager = 0;
if ( !library )
return FTC_Err_Invalid_Library_Handle;
memory = library->memory;
if ( ALLOC( manager, sizeof ( *manager ) ) )
goto Exit;
if ( max_faces == 0 )
max_faces = FTC_MAX_FACES_DEFAULT;
if ( max_sizes == 0 )
max_sizes = FTC_MAX_SIZES_DEFAULT;
if ( max_bytes == 0 )
max_bytes = FTC_MAX_BYTES_DEFAULT;
error = FT_LruList_New( &ftc_face_list_class,
max_faces,
manager,
memory,
&manager->faces_list );
if ( error )
goto Exit;
error = FT_LruList_New( &ftc_size_list_class,
max_sizes,
manager,
memory,
&manager->sizes_list );
if ( error )
goto Exit;
manager->library = library;
manager->max_weight = max_bytes;
manager->cur_weight = 0;
manager->request_face = requester;
manager->request_data = req_data;
*amanager = manager;
Exit:
if ( error && manager )
{
FT_LruList_Destroy( manager->faces_list );
FT_LruList_Destroy( manager->sizes_list );
FREE( manager );
}
return error;
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( void )
FTC_Manager_Done( FTC_Manager manager )
{
FT_Memory memory;
FT_UInt index;
if ( !manager || !manager->library )
return;
memory = manager->library->memory;
/* now discard all caches */
for (index = 0; index < FTC_MAX_CACHES; index++ )
{
FTC_Cache cache = manager->caches[index];
if ( cache )
{
cache->clazz->cache_done( cache );
FREE( cache );
manager->caches[index] = 0;
}
}
/* discard faces and sizes */
FT_LruList_Destroy( manager->faces_list );
manager->faces_list = 0;
FT_LruList_Destroy( manager->sizes_list );
manager->sizes_list = 0;
FREE( manager );
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( void )
FTC_Manager_Reset( FTC_Manager manager )
{
if ( manager )
{
FT_LruList_Reset( manager->sizes_list );
FT_LruList_Reset( manager->faces_list );
}
/* XXX: FIXME: flush the caches? */
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( FT_Error )
FTC_Manager_Lookup_Face( FTC_Manager manager,
FTC_FaceID face_id,
FT_Face *aface )
{
FT_Error error;
FTC_FaceNode node;
if ( aface == NULL )
return FTC_Err_Bad_Argument;
*aface = NULL;
if ( !manager )
return FTC_Err_Invalid_Cache_Handle;
error = FT_LruList_Lookup( manager->faces_list,
(FT_LruKey)face_id,
(FT_LruNode*)&node );
if ( !error )
*aface = node->face;
return error;
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( FT_Error )
FTC_Manager_Lookup_Size( FTC_Manager manager,
FTC_Font font,
FT_Face *aface,
FT_Size *asize )
{
FT_Error error;
/* check for valid `manager' delayed to FTC_Manager_Lookup_Face() */
if ( aface )
*aface = 0;
if ( asize )
*asize = 0;
error = FTC_Manager_Lookup_Face( manager, font->face_id, aface );
if ( !error )
{
FTC_SizeQueryRec query;
FTC_SizeNode node;
query.face = *aface;
query.width = font->pix_width;
query.height = font->pix_height;
error = FT_LruList_Lookup( manager->sizes_list,
(FT_LruKey)&query,
(FT_LruNode*)&node );
if ( !error )
{
/* select the size as the current one for this face */
FT_Activate_Size( node->size );
if ( asize )
*asize = node->size;
}
}
return error;
}
/* add a new node to the head of the manager's circular MRU list */
static void
ftc_node_mru_link( FTC_Node node,
FTC_Manager manager )
{
FTC_Node first = manager->nodes_list;
if ( first )
{
node->mru_prev = first->mru_prev;
node->mru_next = first;
first->mru_prev->mru_next = node;
first->mru_prev = node;
}
else
{
node->mru_next = node;
node->mru_prev = node;
}
manager->nodes_list = node;
manager->num_nodes++;
}
/* remove a node from the manager's MRU list */
static void
ftc_node_mru_unlink( FTC_Node node,
FTC_Manager manager )
{
FTC_Node prev = node->mru_prev;
FTC_Node next = node->mru_next;
FTC_Node first = manager->nodes_list;
prev->mru_next = next;
next->mru_prev = prev;
if ( node->mru_next == first )
{
/* this is the last node in the list; update its head pointer */
if ( node == first )
manager->nodes_list = NULL;
else
first->mru_prev = prev;
}
node->mru_next = NULL;
node->mru_prev = NULL;
manager->num_nodes--;
}
/* move a node to the head of the manager's MRU list */
static void
ftc_node_mru_up( FTC_Node node,
FTC_Manager manager )
{
FTC_Node first = manager->nodes_list;
if ( node != first )
{
ftc_node_mru_unlink( node, manager );
ftc_node_mru_link( node, manager );
}
}
/* remove a node from its cache's hash table */
static void
ftc_node_hash_unlink( FTC_Node node,
FTC_Cache cache )
{
FTC_Node *pnode = cache->buckets + ( node->hash % cache->size );
for (;;)
{
if ( *pnode == NULL )
{
FT_ERROR(( "FreeType.cache.hash_unlink: unknown node!\n" ));
return;
}
if ( *pnode == node )
{
*pnode = node->link;
node->link = NULL;
cache->nodes--;
return;
}
pnode = &(*pnode)->link;
}
}
/* add a node to the "top" of its cache's hash table */
static void
ftc_node_hash_link( FTC_Node node,
FTC_Cache cache )
{
FTC_Node *pnode = cache->buckets + ( node->hash % cache->size );
node->link = *pnode;
*pnode = node;
cache->nodes++;
}
/* remove a node from the cache manager */
static void
ftc_node_destroy( FTC_Node node,
FTC_Manager manager )
{
FT_Memory memory = manager->library->memory;
FTC_Cache cache;
FTC_Cache_Class clazz;
#ifdef FT_DEBUG_ERROR
/* find node's cache */
if ( node->cache_index >= FTC_MAX_CACHES )
{
FT_ERROR(( "FreeType.cache.node_destroy: invalid node handle\n" ));
return;
}
#endif
cache = manager->caches[node->cache_index];
#ifdef FT_DEBUG_ERROR
if ( cache == NULL )
{
FT_ERROR(( "FreeType.cache.node_destroy: invalid node handle\n" ));
return;
}
#endif
clazz = cache->clazz;
manager->cur_weight -= clazz->node_weight( node, cache );
/* remove node from mru list */
ftc_node_mru_unlink( node, manager );
/* remove node from cache's hash table */
ftc_node_hash_unlink( node, cache );
/* now finalize it */
if ( clazz->node_done )
clazz->node_done( node, cache );
FREE( node );
/* check, just in case of general corruption :-) */
if ( manager->num_nodes <= 0 )
FT_ERROR(( "FTC_Manager_Compress: Invalid cache node count! = %d\n",
manager->num_nodes ));
}
FT_EXPORT_DEF( void )
FTC_Manager_Check( FTC_Manager manager )
{
FTC_Node node, first;
first = manager->nodes_list;
/* check node weights */
if ( first )
{
FT_ULong weight = 0;
node = first;
do
{
FTC_Cache cache = manager->caches[node->cache_index];
weight += cache->clazz->node_weight( node, cache );
node = node->mru_next;
} while ( node != first );
if ( weight != manager->cur_weight )
FT_ERROR((
"FTC_Manager_Compress: invalid weight %ld instead of %ld\n",
manager->cur_weight, weight ));
}
/* check circular list */
if ( first )
{
FT_UFast count = 0;
node = first;
do
{
count++;
node = node->mru_next;
} while ( node != first );
if ( count != manager->num_nodes )
FT_ERROR((
"FTC_Manager_Compress: invalid cache node count %d instead of %d\n",
manager->num_nodes, count ));
}
}
/* `Compress' the manager's data, i.e., get rid of old cache nodes */
/* that are not referenced anymore in order to limit the total */
/* memory used by the cache. */
/* documentation is in ftcmanag.h */
FT_EXPORT_DEF( void )
FTC_Manager_Compress( FTC_Manager manager )
{
FTC_Node node, first;
if ( !manager )
return;
first = manager->nodes_list;
#if 0
FTC_Manager_Check( manager );
FT_ERROR(( "compressing, weight = %ld, max = %ld, nodes = %d\n",
manager->cur_weight, manager->max_weight,
manager->num_nodes ));
#endif
if ( manager->cur_weight < manager->max_weight || first == NULL )
return;
/* go to last node - it's a circular list */
node = first->mru_prev;
do
{
FTC_Node prev = node->mru_prev;
prev = ( node == first ) ? NULL : node->mru_prev;
if ( node->ref_count <= 0 )
ftc_node_destroy( node, manager );
node = prev;
} while ( node && manager->cur_weight > manager->max_weight );
}
FT_EXPORT_DEF( FT_Error )
FTC_Manager_Register_Cache( FTC_Manager manager,
FTC_Cache_Class clazz,
FTC_Cache *acache )
{
FT_Error error = FTC_Err_Invalid_Argument;
FTC_Cache cache = NULL;
if ( manager && clazz && acache )
{
FT_Memory memory = manager->library->memory;
FT_UInt index = 0;
/* check for an empty cache slot in the manager's table */
for ( index = 0; index < FTC_MAX_CACHES; index++ )
{
if ( manager->caches[index] == 0 )
break;
}
/* return an error if there are too many registered caches */
if ( index >= FTC_MAX_CACHES )
{
error = FTC_Err_Too_Many_Caches;
FT_ERROR(( "FTC_Manager_Register_Cache:" ));
FT_ERROR(( " too many registered caches\n" ));
goto Exit;
}
if ( !ALLOC( cache, clazz->cache_size ) )
{
cache->manager = manager;
cache->memory = memory;
cache->clazz = clazz;
/* THIS IS VERY IMPORTANT! IT WILL WRETCH THE MANAGER */
/* IF IT IS NOT SET CORRECTLY */
cache->cache_index = index;
if ( clazz->cache_init )
{
error = clazz->cache_init( cache );
if ( error )
{
if ( clazz->cache_done )
clazz->cache_done( cache );
FREE( cache );
goto Exit;
}
}
manager->caches[index] = cache;
}
}
Exit:
*acache = cache;
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** ABSTRACT CACHE CLASS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
#define FTC_PRIMES_MIN 7
#define FTC_PRIMES_MAX 13845163
static const FT_UInt ftc_primes[] =
{
7,
11,
19,
37,
73,
109,
163,
251,
367,
557,
823,
1237,
1861,
2777,
4177,
6247,
9371,
14057,
21089,
31627,
47431,
71143,
106721,
160073,
240101,
360163,
540217,
810343,
1215497,
1823231,
2734867,
4102283,
6153409,
9230113,
13845163,
};
static FT_UFast
ftc_prime_closest( FT_UFast num )
{
FT_UInt i;
for ( i = 0; i < sizeof ( ftc_primes ) / sizeof ( ftc_primes[0] ); i++ )
if ( ftc_primes[i] > num )
return ftc_primes[i];
return FTC_PRIMES_MAX;
}
FT_EXPORT_DEF( void )
ftc_cache_resize( FTC_Cache cache )
{
FT_UFast new_size;
new_size = ftc_prime_closest( cache->nodes );
if ( new_size != cache->size )
{
FT_Memory memory = cache->memory;
FT_Error error;
FTC_Node* new_buckets ;
FT_ULong i;
if ( ALLOC_ARRAY( new_buckets, new_size, FTC_Node ) )
return;
for ( i = 0; i < cache->size; i++ )
{
FTC_Node node, next, *pnode;
FT_UFast hash;
node = cache->buckets[i];
while ( node )
{
next = node->link;
hash = node->hash % new_size;
pnode = new_buckets + hash;
node->link = pnode[0];
pnode[0] = node;
node = next;
}
}
if ( cache->buckets )
FREE( cache->buckets );
cache->buckets = new_buckets;
cache->size = new_size;
}
}
FT_EXPORT_DEF( FT_Error )
ftc_cache_init( FTC_Cache cache )
{
FT_Memory memory = cache->memory;
FT_Error error;
cache->nodes = 0;
cache->size = FTC_PRIMES_MIN;
if ( ALLOC_ARRAY( cache->buckets, cache->size, FTC_Node ) )
goto Exit;
Exit:
return error;
}
FT_EXPORT_DEF( void )
ftc_cache_done( FTC_Cache cache )
{
if ( cache )
{
FT_Memory memory = cache->memory;
FTC_Cache_Class clazz = cache->clazz;
FTC_Manager manager = cache->manager;
FT_UFast i;
for ( i = 0; i < cache->size; i++ )
{
FTC_Node *pnode = cache->buckets + i, next, node = *pnode;
while ( node )
{
next = node->link;
node->link = NULL;
/* remove node from mru list */
ftc_node_mru_unlink( node, manager );
/* now finalize it */
manager->cur_weight -= clazz->node_weight( node, cache );
if ( clazz->node_done )
clazz->node_done( node, cache );
FREE( node );
node = next;
}
cache->buckets[i] = NULL;
}
FREE( cache->buckets );
cache->nodes = 0;
cache->size = 0;
}
}
/* Look up a node in "top" of its cache's hash table. */
/* If not found, create a new node. */
/* */
FT_EXPORT_DEF( FT_Error )
ftc_cache_lookup_node( FTC_Cache cache,
FT_UFast key_hash,
FT_Pointer key,
FTC_Node *anode )
{
FT_Error error = 0;
FTC_Node result = NULL;
FTC_Node* bucket = cache->buckets + ( key_hash % cache->size );
if ( *bucket )
{
FTC_Node* pnode = bucket;
FTC_Node_CompareFunc compare = cache->clazz->node_compare;
for (;;)
{
FTC_Node node;
node = *pnode;
if ( node == NULL )
break;
if ( compare( node, key, cache ) )
{
/* move to head of bucket list */
if ( pnode != bucket )
{
*pnode = node->link;
node->link = *bucket;
*bucket = node;
}
/* move to head of MRU list */
if ( node != cache->manager->nodes_list )
ftc_node_mru_up( node, cache->manager );
result = node;
goto Exit;
}
pnode = &(*pnode)->link;
}
}
/* didn't find a node, create a new one */
{
FTC_Cache_Class clazz = cache->clazz;
FTC_Manager manager = cache->manager;
FT_Memory memory = cache->memory;
FTC_Node node;
if ( ALLOC( node, clazz->node_size ) )
goto Exit;
/* node initializer must set 'hash' field */
node->cache_index = cache->cache_index;
node->ref_count = 0;
error = clazz->node_init( node, key, cache );
if ( error )
{
FREE( node );
goto Exit;
}
ftc_node_hash_link( node, cache );
ftc_node_mru_link( node, cache->manager );
cache->manager->cur_weight += clazz->node_weight( node, cache );
/* now try to compress the node pool when necessary */
if ( manager->cur_weight >= manager->max_weight )
{
node->ref_count++;
FTC_Manager_Compress( manager );
node->ref_count--;
}
/* try to resize the hash table when appropriate */
if ( FTC_CACHE_RESIZE_TEST( cache ) )
ftc_cache_resize( cache );
result = node;
}
Exit:
*anode = result;
return error;
}
/* maybe the next two functions will disappear eventually */
FT_EXPORT_DEF( void )
ftc_node_ref( FTC_Node node,
FTC_Cache cache )
{
if ( node && cache && (FT_UInt)node->cache_index == cache->cache_index )
node->ref_count++;
}
FT_EXPORT_DEF( void )
ftc_node_unref( FTC_Node node,
FTC_Cache cache )
{
if ( node && cache && (FT_UInt)node->cache_index == cache->cache_index )
node->ref_count--;
}
/* END */
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