ref: 6654763f83d1fc4314e6ed0228b31fab6b517256
dir: /src/cache/ftcmanag.c/
/***************************************************************************/
/* */
/* ftcmanag.c */
/* */
/* FreeType Cache Manager (body). */
/* */
/* Copyright 2000-2001, 2002, 2003 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_INTERNAL_MANAGER_H
#include FT_INTERNAL_OBJECTS_H
#include FT_INTERNAL_DEBUG_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 )
static FT_Error
ftc_scaler_lookup_size( FTC_Manager manager,
FTC_Scaler scaler,
FT_Size *asize )
{
FT_Face face;
FT_Size size = NULL;
FT_Error error;
error = FTC_Manager_LookupFace( manager, scaler->face_id, &face );
if ( error )
goto Exit;
error = FT_New_Size( face, &size );
if ( error )
goto Exit;
FT_Activate_Size( size );
if ( scaler->pixel )
error = FT_Set_Pixel_Sizes( face, scaler->width, scaler->height );
else
error = FT_Set_Char_Size( face, scaler->width, scaler->height,
scaler->x_res, scaler->y_res );
if ( error )
{
FT_Done_Size( size );
size = NULL;
}
Exit:
*asize = size;
return error;
}
typedef struct FTC_SizeNodeRec_
{
FTC_MruNodeRec node;
FT_Size size;
FTC_ScalerRec scaler;
} FTC_SizeNodeRec, *FTC_SizeNode;
FT_CALLBACK_DEF( void )
ftc_size_node_done( FTC_SizeNode node )
{
FT_Size size = node->size;
if ( size )
FT_Done_Size( size );
}
FT_CALLBACK_DEF( FT_Bool )
ftc_size_node_compare( FTC_SizeNode node,
FTC_Scaler scaler )
{
FTC_Scaler scaler0 = &node->scaler;
if ( FTC_SCALER_COMPARE( scaler0, scaler ) )
{
FT_Activate_Size( node->size );
return 1;
}
return 0;
}
FT_CALLBACK_DEF( FT_Error )
ftc_size_node_init( FTC_SizeNode node,
FTC_Scaler scaler,
FTC_Manager manager )
{
node->scaler = scaler[0];
return ftc_scaler_lookup_size( manager, scaler, &node->size );
}
FT_CALLBACK_DEF( FT_Error )
ftc_size_node_reset( FTC_SizeNode node,
FTC_Scaler scaler,
FTC_Manager manager )
{
FT_Done_Size( node->size );
node->scaler = scaler[0];
return ftc_scaler_lookup_size( manager, scaler, &node->size );
}
static const FTC_MruListClassRec ftc_size_list_class =
{
sizeof( FTC_SizeNodeRec ),
(FTC_MruNode_CompareFunc)ftc_size_node_compare,
(FTC_MruNode_InitFunc) ftc_size_node_init,
(FTC_MruNode_ResetFunc) ftc_size_node_reset,
(FTC_MruNode_DoneFunc) ftc_size_node_done
};
/* helper function used by ftc_face_node_done */
static FT_Bool
ftc_size_node_compare_faceid( FTC_SizeNode node,
FTC_FaceID face_id )
{
return FT_BOOL( node->scaler.face_id == face_id );
}
FT_EXPORT_DEF( FT_Error )
FTC_Manager_LookupSize( FTC_Manager manager,
FTC_Scaler scaler,
FT_Size *asize )
{
FT_Error error;
FTC_SizeNode node;
if ( asize == NULL )
return FTC_Err_Bad_Argument;
*asize = NULL;
if ( !manager )
return FTC_Err_Invalid_Cache_Handle;
/* we break encapsulation for the sake of speed */
error = 0;
FTC_MRULIST_LOOP( &manager->sizes, node )
{
FTC_Scaler scaler0 = &node->scaler;
if ( FTC_SCALER_COMPARE( scaler0, scaler ) )
goto Found;
}
FTC_MRULIST_LOOP_END();
error = FTC_MruList_New( &manager->sizes, scaler, (FTC_MruNode*)&node );
Found:
if ( !error )
*asize = node->size;
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FACE MRU IMPLEMENTATION *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
typedef struct FTC_FaceNodeRec_
{
FTC_MruNodeRec node;
FTC_FaceID face_id;
FT_Face face;
} FTC_FaceNodeRec, *FTC_FaceNode;
FT_CALLBACK_DEF( FT_Error )
ftc_face_node_init( FTC_FaceNode node,
FTC_FaceID face_id,
FTC_Manager manager )
{
FT_Error error;
node->face_id = face_id;
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;
}
FT_CALLBACK_DEF( void )
ftc_face_node_done( FTC_FaceNode node,
FTC_Manager manager )
{
/* we must begin by removing all scalers for the target face */
/* from the manager's list */
FTC_MruList_RemoveSelection(
& manager->sizes,
(FTC_MruNode_CompareFunc)ftc_size_node_compare_faceid,
node->face_id );
/* all right, we can discard the face now */
FT_Done_Face( node->face );
node->face = NULL;
node->face_id = NULL;
}
FT_CALLBACK_DEF( FT_Bool )
ftc_face_node_compare( FTC_FaceNode node,
FTC_FaceID face_id )
{
return FT_BOOL( node->face_id == face_id );
}
static const FTC_MruListClassRec ftc_face_list_class =
{
sizeof( FTC_FaceNodeRec),
(FTC_MruNode_CompareFunc)ftc_face_node_compare,
(FTC_MruNode_InitFunc) ftc_face_node_init,
(FTC_MruNode_ResetFunc) NULL,
(FTC_MruNode_DoneFunc) ftc_face_node_done
};
/* documentation is in ftcache.h */
FT_EXPORT_DEF( FT_Error )
FTC_Manager_LookupFace( 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;
/* we break encapsulation for the sake of speed */
error = 0;
FTC_MRULIST_LOOP( &manager->faces, node )
{
if ( node->face_id == face_id )
goto Found;
}
FTC_MRULIST_LOOP_END();
error = FTC_MruList_New( &manager->faces, face_id, (FTC_MruNode*)&node );
Found:
if ( !error )
*aface = node->face;
return error;
}
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** 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 ( FT_NEW( 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;
manager->library = library;
manager->memory = memory;
manager->max_weight = max_bytes;
manager->request_face = requester;
manager->request_data = req_data;
FTC_MruList_Init( &manager->faces,
&ftc_face_list_class,
max_faces,
manager,
memory );
FTC_MruList_Init( &manager->sizes,
&ftc_size_list_class,
max_sizes,
manager,
memory );
*amanager = manager;
Exit:
return error;
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( void )
FTC_Manager_Done( FTC_Manager manager )
{
FT_Memory memory;
FT_UInt idx;
if ( !manager || !manager->library )
return;
memory = manager->memory;
/* now discard all caches */
for (idx = manager->num_caches; idx-- > 0; )
{
FTC_Cache cache = manager->caches[idx];
if ( cache )
{
cache->clazz.cache_done( cache );
FT_FREE( cache );
manager->caches[idx] = NULL;
}
}
manager->num_caches = 0;
/* discard faces and sizes */
FTC_MruList_Done( &manager->sizes );
FTC_MruList_Done( &manager->faces );
manager->library = NULL;
manager->memory = NULL;
FT_FREE( manager );
}
/* documentation is in ftcache.h */
FT_EXPORT_DEF( void )
FTC_Manager_Reset( FTC_Manager manager )
{
if ( manager )
{
FTC_MruList_Reset( &manager->sizes );
FTC_MruList_Reset( &manager->faces );
}
/* XXX: FIXME: flush the caches? */
}
#ifdef FT_DEBUG_ERROR
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];
if ( (FT_UInt)node->cache_index >= manager->num_caches )
FT_ERROR(( "FTC_Manager_Check: invalid node (cache index = %ld\n",
node->cache_index ));
else
weight += cache->clazz.node_weight( node, cache );
node = FTC_NODE__NEXT( node );
} while ( node != first );
if ( weight != manager->cur_weight )
FT_ERROR(( "FTC_Manager_Check: 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 = FTC_NODE__NEXT( node );
} while ( node != first );
if ( count != manager->num_nodes )
FT_ERROR((
"FTC_Manager_Check: invalid cache node count %d instead of %d\n",
manager->num_nodes, count ));
}
}
#endif /* FT_DEBUG_ERROR */
/* `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;
#ifdef FT_DEBUG_ERROR
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 = FTC_NODE__PREV( first );
do
{
FTC_Node prev;
prev = ( node == first ) ? NULL : FTC_NODE__PREV( node );
if ( node->ref_count <= 0 )
ftc_node_destroy( node, manager );
node = prev;
} while ( node && manager->cur_weight > manager->max_weight );
}
/* documentation is in ftcmanag.h */
FT_EXPORT_DEF( FT_Error )
FTC_Manager_RegisterCache( FTC_Manager manager,
FTC_CacheClass clazz,
FTC_Cache *acache )
{
FT_Error error = FTC_Err_Invalid_Argument;
FTC_Cache cache = NULL;
if ( manager && clazz && acache )
{
FT_Memory memory = manager->memory;
if ( manager->num_caches >= FTC_MAX_CACHES )
{
error = FTC_Err_Too_Many_Caches;
FT_ERROR(( "%s: too many registered caches\n",
"FTC_Manager_Register_Cache" ));
goto Exit;
}
if ( !FT_ALLOC( cache, clazz->cache_size ) )
{
cache->manager = manager;
cache->memory = memory;
cache->clazz = clazz[0];
cache->org_class = clazz;
/* THIS IS VERY IMPORTANT! IT WILL WRETCH THE MANAGER */
/* IF IT IS NOT SET CORRECTLY */
cache->index = manager->num_caches;
error = clazz->cache_init( cache );
if ( error )
{
clazz->cache_done( cache );
FT_FREE( cache );
goto Exit;
}
manager->caches[manager->num_caches++] = cache;
}
}
Exit:
*acache = cache;
return error;
}
FT_EXPORT_DEF( FT_UInt )
FTC_Manager_FlushN( FTC_Manager manager,
FT_UInt count )
{
FTC_Node first = manager->nodes_list;
FTC_Node node;
FT_UInt result;
/* try to remove `count' nodes from the list */
if ( first == NULL ) /* empty list! */
return 0;
/* go to last node - it's a circular list */
node = FTC_NODE__PREV(first);
for ( result = 0; result < count; )
{
FTC_Node prev = FTC_NODE__PREV( node );
/* don't touch locked nodes */
if ( node->ref_count <= 0 )
{
ftc_node_destroy( node, manager );
result++;
}
if ( prev == manager->nodes_list )
break;
node = prev;
}
return result;
}
FT_EXPORT_DEF( void )
FTC_Manager_RemoveFaceID( FTC_Manager manager,
FTC_FaceID face_id )
{
FT_UInt nn;
/* this will remove all FTC_SizeNode that correspond to
* the face_id as well
*/
FTC_MruList_RemoveSelection( &manager->faces, NULL, face_id );
for ( nn = 0; nn < manager->num_caches; nn++ )
FTC_Cache_RemoveFaceID( manager->caches[nn], face_id );
}
/* documentation is in ftcmanag.h */
FT_EXPORT_DEF( void )
FTC_Node_Unref( FTC_Node node,
FTC_Manager manager )
{
if ( node && (FT_UInt)node->cache_index < manager->num_caches )
node->ref_count--;
}
/* END */