ref: bf8155a0957d9e7a5e2518bc6609632edaf13397
dir: /src/cache/ftcmanag.c/
/***************************************************************************/
/* */
/* ftcmanag.c */
/* */
/* FreeType Cache Manager (body). */
/* */
/* Copyright 2000 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 <freetype/cache/ftcmanag.h>
#include <freetype/internal/ftobjs.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/ftlist.h>
#undef FT_COMPONENT
#define FT_COMPONENT trace_cache
#define FTC_LRU_GET_MANAGER( lru ) (FTC_Manager)lru->user_data
/*************************************************************************/
/*************************************************************************/
/***** *****/
/***** FACE & SIZE LRU CALLBACKS *****/
/***** *****/
/*************************************************************************/
/*************************************************************************/
FT_CALLBACK_DEF
FT_Error ftc_manager_init_face( FT_Lru lru,
FT_LruNode node )
{
FTC_Manager manager = FTC_LRU_GET_MANAGER( lru );
FT_Error error;
FT_Face face;
error = manager->request_face( (FTC_FaceID)node->key,
manager->library,
manager->request_data,
(FT_Face*)&node->root.data );
if ( !error )
{
/* destroy initial size object; it will be re-created later */
face = (FT_Face)node->root.data;
if ( face->size )
FT_Done_Size( face->size );
}
return error;
}
/* helper function for ftc_manager_done_face() */
FT_CALLBACK_DEF
FT_Bool ftc_manager_size_selector( FT_Lru lru,
FT_LruNode node,
FT_Pointer data )
{
FT_UNUSED( lru );
return ((FT_Size)node->root.data)->face == (FT_Face)data;
}
FT_CALLBACK_DEF
void ftc_manager_done_face( FT_Lru lru,
FT_LruNode node )
{
FTC_Manager manager = FTC_LRU_GET_MANAGER( lru );
FT_Face face = (FT_Face)node->root.data;
/* we must begin by removing all sizes for the target face */
/* from the manager's list */
FT_Lru_Remove_Selection( manager->sizes_lru,
ftc_manager_size_selector,
face );
/* all right, we can discard the face now */
FT_Done_Face( face );
node->root.data = 0;
}
typedef struct FTC_FontRequest_
{
FT_Face face;
FT_UShort width;
FT_UShort height;
} FTC_FontRequest;
FT_CALLBACK_DEF
FT_Error ftc_manager_init_size( FT_Lru lru,
FT_LruNode node )
{
FTC_FontRequest* font_req = (FTC_FontRequest*)node->key;
FT_Size size;
FT_Error error;
FT_Face face = font_req->face;
FT_UNUSED( lru );
node->root.data = 0;
error = FT_New_Size( face, &size );
if ( !error )
{
face->size = size;
error = FT_Set_Pixel_Sizes( face,
font_req->width,
font_req->height );
if ( error )
FT_Done_Size( size );
else
node->root.data = size;
}
return error;
}
FT_CALLBACK_DEF
void ftc_manager_done_size( FT_Lru lru,
FT_LruNode node )
{
FT_UNUSED( lru );
FT_Done_Size( (FT_Size)node->root.data );
}
FT_CALLBACK_DEF
FT_Error ftc_manager_flush_size( FT_Lru lru,
FT_LruNode node,
FT_LruKey key )
{
FTC_FontRequest* req = (FTC_FontRequest*)key;
FT_Size size = (FT_Size)node->root.data;
FT_Error error;
if ( size->face == req->face )
{
size->face->size = size; /* set current size */
error = FT_Set_Pixel_Sizes( req->face, req->width, req->height );
if ( error )
FT_Done_Size( size );
}
else
{
FT_Done_Size( size );
node->key = key;
error = ftc_manager_init_size( lru, node );
}
return error;
}
FT_CALLBACK_DEF
FT_Bool ftc_manager_compare_size( FT_LruNode node,
FT_LruKey key )
{
FTC_FontRequest* req = (FTC_FontRequest*)key;
FT_Size size = (FT_Size)node->root.data;
FT_UNUSED( node );
return ( size->face == req->face &&
size->metrics.x_ppem == req->width &&
size->metrics.y_ppem == req->height );
}
FT_CALLBACK_TABLE_DEF
const FT_Lru_Class ftc_face_lru_class =
{
sizeof ( FT_LruRec ),
ftc_manager_init_face,
ftc_manager_done_face,
0,
0
};
FT_CALLBACK_TABLE_DEF
const FT_Lru_Class ftc_size_lru_class =
{
sizeof ( FT_LruRec ),
ftc_manager_init_size,
ftc_manager_done_size,
ftc_manager_flush_size,
ftc_manager_compare_size
};
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 FT_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_Lru_New( &ftc_face_lru_class,
max_faces,
manager,
memory,
1, /* pre_alloc = TRUE */
(FT_Lru*)&manager->faces_lru );
if ( error )
goto Exit;
error = FT_Lru_New( &ftc_size_lru_class,
max_sizes,
manager,
memory,
1, /* pre_alloc = TRUE */
(FT_Lru*)&manager->sizes_lru );
if ( error )
goto Exit;
manager->library = library;
manager->max_bytes = max_bytes;
manager->request_face = requester;
manager->request_data = req_data;
*amanager = manager;
Exit:
if ( error && manager )
{
FT_Lru_Done( manager->sizes_lru );
FT_Lru_Done( manager->faces_lru );
FREE( manager );
}
return error;
}
FT_EXPORT( 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->done_cache( cache );
FREE( cache );
manager->caches[index] = 0;
}
}
/* discard faces and sizes */
FT_Lru_Done( manager->sizes_lru );
FT_Lru_Done( manager->faces_lru );
FREE( manager );
}
FT_EXPORT( void ) FTC_Manager_Reset( FTC_Manager manager )
{
if (manager )
{
FT_Lru_Reset( manager->sizes_lru );
FT_Lru_Reset( manager->faces_lru );
}
/* XXX: FIXME: flush the caches? */
}
FT_EXPORT( FT_Error ) FTC_Manager_Lookup_Face( FTC_Manager manager,
FTC_FaceID face_id,
FT_Face *aface )
{
if ( !manager )
return FT_Err_Invalid_Cache_Handle;
return FT_Lru_Lookup( manager->faces_lru,
(FT_LruKey)face_id,
(FT_Pointer*)aface );
}
FT_EXPORT( FT_Error ) FTC_Manager_Lookup_Size( FTC_Manager manager,
FTC_Font font,
FT_Face *aface,
FT_Size *asize )
{
FTC_FontRequest req;
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 )
{
FT_Size size;
req.face = *aface;
req.width = font->pix_width;
req.height = font->pix_height;
error = FT_Lru_Lookup( manager->sizes_lru,
(FT_LruKey)&req,
(FT_Pointer*)&size );
if ( !error )
{
/* select the size as the current one for this face */
(*aface)->size = size;
if ( asize )
*asize = size;
}
}
return 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. */
FT_EXPORT_DEF( void ) FTC_Manager_Compress( FTC_Manager manager )
{
FT_ListNode node;
node = manager->global_lru.tail;
while ( manager->num_bytes > manager->max_bytes && node )
{
FTC_CacheNode cache_node = FTC_LIST_TO_CACHENODE( node );
FTC_CacheNode_Data* data = FTC_CACHENODE_TO_DATA_P( cache_node );
FTC_Cache cache;
FT_ListNode prev = node->prev;
if ( data->ref_count <= 0 )
{
/* ok, we are going to remove this node */
FT_List_Remove( &manager->global_lru, node );
/* finalize cache node */
cache = manager->caches[data->cache_index];
if ( cache )
{
FTC_CacheNode_Class* clazz = cache->node_clazz;
manager->num_bytes -= clazz->size_node( cache_node,
cache->cache_data );
clazz->destroy_node( cache_node, cache->cache_data );
}
else
{
/* this should never happen! */
FT_ERROR(( "FTC_Manager_Compress: Cache Manager is corrupted!\n" ));
}
/* check, just in case of general corruption :-) */
if ( manager->num_nodes <= 0 )
FT_ERROR(( "FTC_Manager_Compress: Invalid cache node count!\n" ));
else
manager->num_nodes--;
}
node = prev;
}
}
FT_EXPORT( FT_Error ) FTC_Manager_Register_Cache(
FTC_Manager manager,
FTC_Cache_Class* clazz,
FTC_Cache *acache )
{
FT_Error error = FT_Err_Invalid_Argument;
if ( manager && clazz && acache )
{
FT_Memory memory = manager->library->memory;
FTC_Cache cache;
FT_UInt index = 0;
/* by default, return 0 */
*acache = 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 = FT_Err_Too_Many_Caches;
FT_ERROR(( "FTC_Manager_Register_Cache:" ));
FT_ERROR(( " too many registered caches\n" ));
goto Exit;
}
if ( !ALLOC( cache, clazz->cache_byte_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->init_cache )
error = clazz->init_cache( cache );
if ( error )
FREE( cache );
else
manager->caches[index] = *acache = cache;
}
}
Exit:
return error;
}
/* END */