ref: d1b7475be1da031a6f60c229cc0c96a37e6da37e
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 <cache/ftcmanag.h>
#include <freetype/internal/ftobjs.h>
#define FTC_LRU_GET_MANAGER( lru ) (FTC_Manager)lru->user_data
/**************************************************************************/
/**************************************************************************/
/***** *****/
/***** FACE & SIZE LRU CALLBACKS *****/
/***** *****/
/**************************************************************************/
/**************************************************************************/
static
FT_Error ftc_manager_init_face( FT_Lru lru,
FT_LruNode node )
{
FTC_Manager manager = FTC_LRU_GET_MANAGER( lru );
FT_Error error;
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 */
FT_Face face = (FT_Face)node->root.data;
FT_Done_Size( face->size );
}
return error;
}
/* helper function for ftc_manager_done_face */
static
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;
}
static
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_SizeRequest_
{
FT_Face face;
FT_UShort width;
FT_UShort height;
} FTC_SizeRequest;
static
FT_Error ftc_manager_init_size( FT_Lru lru,
FT_LruNode node )
{
FTC_SizeRequest* size_req = (FTC_SizeRequest*)node->key;
FT_Size size;
FT_Error error;
FT_Face face = size_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,
size_req->width,
size_req->height );
if ( error )
FT_Done_Size( size );
else
node->root.data = size;
}
return error;
}
static
void ftc_manager_done_size( FT_Lru lru,
FT_LruNode node )
{
FT_UNUSED( lru );
FT_Done_Size( (FT_Size)node->root.data );
}
static
FT_Error ftc_manager_flush_size( FT_Lru lru,
FT_LruNode node,
FT_LruKey key )
{
FTC_SizeRequest* req = (FTC_SizeRequest*)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;
}
static
FT_Bool ftc_manager_compare_size( FT_LruNode node,
FT_LruKey key )
{
FTC_SizeRequest* req = (FTC_SizeRequest*)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 );
}
static
const FT_Lru_Class ftc_face_lru_class =
{
sizeof ( FT_LruRec ),
ftc_manager_init_face,
ftc_manager_done_face,
0,
0
};
static
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_FUNC( FT_Error ) FTC_Manager_New( FT_Library library,
FT_UInt max_faces,
FT_UInt max_sizes,
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;
if ( max_sizes == 0 )
max_sizes = FTC_MAX_SIZES;
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->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_DEF( void ) FTC_Manager_Done( FTC_Manager manager )
{
FT_Memory memory;
if ( !manager || !manager->library )
return;
memory = manager->library->memory;
FT_Lru_Done( manager->sizes_lru );
FT_Lru_Done( manager->faces_lru );
FREE( manager );
}
FT_EXPORT_DEF( void ) FTC_Manager_Reset( FTC_Manager manager )
{
if ( !manager )
return;
FT_Lru_Reset( manager->sizes_lru );
FT_Lru_Reset( manager->faces_lru );
}
FT_EXPORT_DEF( FT_Error ) FTC_Manager_Lookup_Face( FTC_Manager manager,
FTC_FaceID face_id,
FT_Face* aface )
{
if ( !manager )
return FT_Err_Invalid_Argument;
return FT_Lru_Lookup( manager->faces_lru,
(FT_LruKey)face_id,
(FT_Pointer*)aface );
}
FT_EXPORT_DEF( FT_Error ) FTC_Manager_Lookup_Size( FTC_Manager manager,
FTC_SizeID size_id,
FT_Face* aface,
FT_Size* asize )
{
FTC_SizeRequest req;
FT_Error error;
FT_Face face;
/* check for valid `manager' delayed to FTC_Manager_Lookup_Face() */
if ( aface )
*aface = 0;
if ( asize )
*asize = 0;
error = FTC_Manager_Lookup_Face( manager, size_id->face_id, &face );
if ( !error )
{
FT_Size size;
req.face = face;
req.width = size_id->pix_width;
req.height = size_id->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 */
face->size = size;
if ( asize )
*asize = size;
if ( aface )
*aface = face;
}
}
return error;
}
/* END */