--- a/misc/libfreetype/src/cache/ftccache.c Thu Jul 25 23:16:06 2013 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,626 +0,0 @@
-/***************************************************************************/
-/* */
-/* ftccache.c */
-/* */
-/* The FreeType internal cache interface (body). */
-/* */
-/* Copyright 2000-2001, 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, */
-/* 2011 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 "ftcmanag.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
-
-
-#define FTC_HASH_MAX_LOAD 2
-#define FTC_HASH_MIN_LOAD 1
-#define FTC_HASH_SUB_LOAD ( FTC_HASH_MAX_LOAD - FTC_HASH_MIN_LOAD )
-
- /* this one _must_ be a power of 2! */
-#define FTC_HASH_INITIAL_SIZE 8
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** CACHE NODE DEFINITIONS *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
- /* 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 )
- {
- void *nl = &manager->nodes_list;
-
-
- FTC_MruNode_Prepend( (FTC_MruNode*)nl,
- (FTC_MruNode)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 )
- {
- void *nl = &manager->nodes_list;
-
-
- FTC_MruNode_Remove( (FTC_MruNode*)nl,
- (FTC_MruNode)node );
- manager->num_nodes--;
- }
-
-
-#ifndef FTC_INLINE
-
- /* 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_MruNode_Up( (FTC_MruNode*)&manager->nodes_list,
- (FTC_MruNode)node );
- }
-
-
- /* get a top bucket for specified hash from cache,
- * body for FTC_NODE__TOP_FOR_HASH( cache, hash )
- */
- FT_LOCAL_DEF( FTC_Node* )
- ftc_get_top_node_for_hash( FTC_Cache cache,
- FT_PtrDist hash )
- {
- FTC_Node* pnode;
- FT_UInt idx;
-
-
- idx = (FT_UInt)( hash & cache->mask );
- if ( idx < cache->p )
- idx = (FT_UInt)( hash & ( 2 * cache->mask + 1 ) );
- pnode = cache->buckets + idx;
- return pnode;
- }
-
-#endif /* !FTC_INLINE */
-
-
- /* Note that this function cannot fail. If we cannot re-size the
- * buckets array appropriately, we simply degrade the hash table's
- * performance!
- */
- static void
- ftc_cache_resize( FTC_Cache cache )
- {
- for (;;)
- {
- FTC_Node node, *pnode;
- FT_UFast p = cache->p;
- FT_UFast mask = cache->mask;
- FT_UFast count = mask + p + 1; /* number of buckets */
-
-
- /* do we need to shrink the buckets array? */
- if ( cache->slack < 0 )
- {
- FTC_Node new_list = NULL;
-
-
- /* try to expand the buckets array _before_ splitting
- * the bucket lists
- */
- if ( p >= mask )
- {
- FT_Memory memory = cache->memory;
- FT_Error error;
-
-
- /* if we can't expand the array, leave immediately */
- if ( FT_RENEW_ARRAY( cache->buckets,
- ( mask + 1 ) * 2, ( mask + 1 ) * 4 ) )
- break;
- }
-
- /* split a single bucket */
- pnode = cache->buckets + p;
-
- for (;;)
- {
- node = *pnode;
- if ( node == NULL )
- break;
-
- if ( node->hash & ( mask + 1 ) )
- {
- *pnode = node->link;
- node->link = new_list;
- new_list = node;
- }
- else
- pnode = &node->link;
- }
-
- cache->buckets[p + mask + 1] = new_list;
-
- cache->slack += FTC_HASH_MAX_LOAD;
-
- if ( p >= mask )
- {
- cache->mask = 2 * mask + 1;
- cache->p = 0;
- }
- else
- cache->p = p + 1;
- }
-
- /* do we need to expand the buckets array? */
- else if ( cache->slack > (FT_Long)count * FTC_HASH_SUB_LOAD )
- {
- FT_UFast old_index = p + mask;
- FTC_Node* pold;
-
-
- if ( old_index + 1 <= FTC_HASH_INITIAL_SIZE )
- break;
-
- if ( p == 0 )
- {
- FT_Memory memory = cache->memory;
- FT_Error error;
-
-
- /* if we can't shrink the array, leave immediately */
- if ( FT_RENEW_ARRAY( cache->buckets,
- ( mask + 1 ) * 2, mask + 1 ) )
- break;
-
- cache->mask >>= 1;
- p = cache->mask;
- }
- else
- p--;
-
- pnode = cache->buckets + p;
- while ( *pnode )
- pnode = &(*pnode)->link;
-
- pold = cache->buckets + old_index;
- *pnode = *pold;
- *pold = NULL;
-
- cache->slack -= FTC_HASH_MAX_LOAD;
- cache->p = p;
- }
-
- /* otherwise, the hash table is balanced */
- else
- break;
- }
- }
-
-
- /* remove a node from its cache's hash table */
- static void
- ftc_node_hash_unlink( FTC_Node node0,
- FTC_Cache cache )
- {
- FTC_Node *pnode = FTC_NODE__TOP_FOR_HASH( cache, node0->hash );
-
-
- for (;;)
- {
- FTC_Node node = *pnode;
-
-
- if ( node == NULL )
- {
- FT_TRACE0(( "ftc_node_hash_unlink: unknown node\n" ));
- return;
- }
-
- if ( node == node0 )
- break;
-
- pnode = &(*pnode)->link;
- }
-
- *pnode = node0->link;
- node0->link = NULL;
-
- cache->slack++;
- ftc_cache_resize( cache );
- }
-
-
- /* 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 = FTC_NODE__TOP_FOR_HASH( cache, node->hash );
-
-
- node->link = *pnode;
- *pnode = node;
-
- cache->slack--;
- ftc_cache_resize( cache );
- }
-
-
- /* remove a node from the cache manager */
-#ifdef FT_CONFIG_OPTION_OLD_INTERNALS
- FT_BASE_DEF( void )
-#else
- FT_LOCAL_DEF( void )
-#endif
- ftc_node_destroy( FTC_Node node,
- FTC_Manager manager )
- {
- FTC_Cache cache;
-
-
-#ifdef FT_DEBUG_ERROR
- /* find node's cache */
- if ( node->cache_index >= manager->num_caches )
- {
- FT_TRACE0(( "ftc_node_destroy: invalid node handle\n" ));
- return;
- }
-#endif
-
- cache = manager->caches[node->cache_index];
-
-#ifdef FT_DEBUG_ERROR
- if ( cache == NULL )
- {
- FT_TRACE0(( "ftc_node_destroy: invalid node handle\n" ));
- return;
- }
-#endif
-
- manager->cur_weight -= cache->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 */
- cache->clazz.node_free( node, cache );
-
-#if 0
- /* check, just in case of general corruption :-) */
- if ( manager->num_nodes == 0 )
- FT_TRACE0(( "ftc_node_destroy: invalid cache node count (%d)\n",
- manager->num_nodes ));
-#endif
- }
-
-
- /*************************************************************************/
- /*************************************************************************/
- /***** *****/
- /***** ABSTRACT CACHE CLASS *****/
- /***** *****/
- /*************************************************************************/
- /*************************************************************************/
-
-
- FT_LOCAL_DEF( FT_Error )
- FTC_Cache_Init( FTC_Cache cache )
- {
- return ftc_cache_init( cache );
- }
-
-
- FT_LOCAL_DEF( FT_Error )
- ftc_cache_init( FTC_Cache cache )
- {
- FT_Memory memory = cache->memory;
- FT_Error error;
-
-
- cache->p = 0;
- cache->mask = FTC_HASH_INITIAL_SIZE - 1;
- cache->slack = FTC_HASH_INITIAL_SIZE * FTC_HASH_MAX_LOAD;
-
- (void)FT_NEW_ARRAY( cache->buckets, FTC_HASH_INITIAL_SIZE * 2 );
- return error;
- }
-
-
- static void
- FTC_Cache_Clear( FTC_Cache cache )
- {
- if ( cache && cache->buckets )
- {
- FTC_Manager manager = cache->manager;
- FT_UFast i;
- FT_UFast count;
-
-
- count = cache->p + cache->mask + 1;
-
- for ( i = 0; i < count; 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 -= cache->clazz.node_weight( node, cache );
-
- cache->clazz.node_free( node, cache );
- node = next;
- }
- cache->buckets[i] = NULL;
- }
- ftc_cache_resize( cache );
- }
- }
-
-
- FT_LOCAL_DEF( void )
- ftc_cache_done( FTC_Cache cache )
- {
- if ( cache->memory )
- {
- FT_Memory memory = cache->memory;
-
-
- FTC_Cache_Clear( cache );
-
- FT_FREE( cache->buckets );
- cache->mask = 0;
- cache->p = 0;
- cache->slack = 0;
-
- cache->memory = NULL;
- }
- }
-
-
- FT_LOCAL_DEF( void )
- FTC_Cache_Done( FTC_Cache cache )
- {
- ftc_cache_done( cache );
- }
-
-
- static void
- ftc_cache_add( FTC_Cache cache,
- FT_PtrDist hash,
- FTC_Node node )
- {
- node->hash = hash;
- node->cache_index = (FT_UInt16)cache->index;
- node->ref_count = 0;
-
- ftc_node_hash_link( node, cache );
- ftc_node_mru_link( node, cache->manager );
-
- {
- FTC_Manager manager = cache->manager;
-
-
- manager->cur_weight += cache->clazz.node_weight( node, cache );
-
- if ( manager->cur_weight >= manager->max_weight )
- {
- node->ref_count++;
- FTC_Manager_Compress( manager );
- node->ref_count--;
- }
- }
- }
-
-
- FT_LOCAL_DEF( FT_Error )
- FTC_Cache_NewNode( FTC_Cache cache,
- FT_PtrDist hash,
- FT_Pointer query,
- FTC_Node *anode )
- {
- FT_Error error;
- FTC_Node node;
-
-
- /*
- * We use the FTC_CACHE_TRYLOOP macros to support out-of-memory
- * errors (OOM) correctly, i.e., by flushing the cache progressively
- * in order to make more room.
- */
-
- FTC_CACHE_TRYLOOP( cache )
- {
- error = cache->clazz.node_new( &node, query, cache );
- }
- FTC_CACHE_TRYLOOP_END( NULL );
-
- if ( error )
- node = NULL;
- else
- {
- /* don't assume that the cache has the same number of buckets, since
- * our allocation request might have triggered global cache flushing
- */
- ftc_cache_add( cache, hash, node );
- }
-
- *anode = node;
- return error;
- }
-
-
-#ifndef FTC_INLINE
-
- FT_LOCAL_DEF( FT_Error )
- FTC_Cache_Lookup( FTC_Cache cache,
- FT_PtrDist hash,
- FT_Pointer query,
- FTC_Node *anode )
- {
- FTC_Node* bucket;
- FTC_Node* pnode;
- FTC_Node node;
- FT_Error error = FTC_Err_Ok;
- FT_Bool list_changed = FALSE;
-
- FTC_Node_CompareFunc compare = cache->clazz.node_compare;
-
-
- if ( cache == NULL || anode == NULL )
- return FTC_Err_Invalid_Argument;
-
- /* Go to the `top' node of the list sharing same masked hash */
- bucket = pnode = FTC_NODE__TOP_FOR_HASH( cache, hash );
-
- /* Lookup a node with exactly same hash and queried properties. */
- /* NOTE: _nodcomp() may change the linked list to reduce memory. */
- for (;;)
- {
- node = *pnode;
- if ( node == NULL )
- goto NewNode;
-
- if ( node->hash == hash &&
- compare( node, query, cache, &list_changed ) )
- break;
-
- pnode = &node->link;
- }
-
- if ( list_changed )
- {
- /* Update bucket by modified linked list */
- bucket = pnode = FTC_NODE__TOP_FOR_HASH( cache, hash );
-
- /* Update pnode by modified linked list */
- while ( *pnode != node )
- {
- if ( *pnode == NULL )
- {
- FT_ERROR(( "FTC_Cache_Lookup: oops!!! node missing\n" ));
- goto NewNode;
- }
- else
- pnode = &((*pnode)->link);
- }
- }
-
- /* Reorder the list to move the found node to the `top' */
- if ( node != *bucket )
- {
- *pnode = node->link;
- node->link = *bucket;
- *bucket = node;
- }
-
- /* move to head of MRU list */
- {
- FTC_Manager manager = cache->manager;
-
-
- if ( node != manager->nodes_list )
- ftc_node_mru_up( node, manager );
- }
- *anode = node;
-
- return error;
-
- NewNode:
- return FTC_Cache_NewNode( cache, hash, query, anode );
- }
-
-#endif /* !FTC_INLINE */
-
-
- FT_LOCAL_DEF( void )
- FTC_Cache_RemoveFaceID( FTC_Cache cache,
- FTC_FaceID face_id )
- {
- FT_UFast i, count;
- FTC_Manager manager = cache->manager;
- FTC_Node frees = NULL;
-
-
- count = cache->p + cache->mask + 1;
- for ( i = 0; i < count; i++ )
- {
- FTC_Node* bucket = cache->buckets + i;
- FTC_Node* pnode = bucket;
-
-
- for ( ;; )
- {
- FTC_Node node = *pnode;
- FT_Bool list_changed = FALSE;
-
-
- if ( node == NULL )
- break;
-
- if ( cache->clazz.node_remove_faceid( node, face_id,
- cache, &list_changed ) )
- {
- *pnode = node->link;
- node->link = frees;
- frees = node;
- }
- else
- pnode = &node->link;
- }
- }
-
- /* remove all nodes in the free list */
- while ( frees )
- {
- FTC_Node node;
-
-
- node = frees;
- frees = node->link;
-
- manager->cur_weight -= cache->clazz.node_weight( node, cache );
- ftc_node_mru_unlink( node, manager );
-
- cache->clazz.node_free( node, cache );
-
- cache->slack++;
- }
-
- ftc_cache_resize( cache );
- }
-
-
-/* END */