+++ /dev/null
-/***************************************************************************/
-/* */
-/* 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_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 & 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_BOOL( ((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 )
- {
- FT_Activate_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 );
- node->root.data = 0;
- }
-
-
- 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 )
- {
- FT_Activate_Size( 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 FT_BOOL( 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
- };
-
-
- /* 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_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->faces_lru );
- FT_Lru_Done( manager->sizes_lru );
- 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->done_cache( cache );
- FREE( cache );
- manager->caches[index] = 0;
- }
- }
-
- /* discard faces and sizes */
- FT_Lru_Done( manager->faces_lru );
- manager->faces_lru = 0;
-
- FT_Lru_Done( manager->sizes_lru );
- manager->sizes_lru = 0;
-
- FREE( manager );
- }
-
-
- /* documentation is in ftcache.h */
-
- FT_EXPORT_DEF( 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? */
- }
-
-
- /* documentation is in ftcache.h */
-
- FT_EXPORT_DEF( FT_Error )
- FTC_Manager_Lookup_Face( FTC_Manager manager,
- FTC_FaceID face_id,
- FT_Face *aface )
- {
- if ( !manager )
- return FTC_Err_Invalid_Cache_Handle;
-
- return FT_Lru_Lookup( manager->faces_lru,
- (FT_LruKey)face_id,
- (FT_Pointer*)aface );
- }
-
-
- /* 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 )
- {
- 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. */
-
- /* documentation is in ftcmanag.h */
-
- 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_DEF( FT_Error )
- FTC_Manager_Register_Cache( FTC_Manager manager,
- FTC_Cache_Class* clazz,
- FTC_Cache *acache )
- {
- FT_Error error = FTC_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 = 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_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 */
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