1 /****************************************************************************
5 * FreeType Cache Manager (body).
7 * Copyright (C) 2000-2023 by
8 * David Turner, Robert Wilhelm, and Werner Lemberg.
10 * This file is part of the FreeType project, and may only be used,
11 * modified, and distributed under the terms of the FreeType project
12 * license, LICENSE.TXT. By continuing to use, modify, or distribute
13 * this file you indicate that you have read the license and
14 * understand and accept it fully.
19 #include <freetype/ftcache.h>
21 #include <freetype/internal/ftobjs.h>
22 #include <freetype/internal/ftdebug.h>
23 #include <freetype/ftsizes.h>
30 #define FT_COMPONENT cache
34 ftc_scaler_lookup_size( FTC_Manager manager,
43 error = FTC_Manager_LookupFace( manager, scaler->face_id, &face );
47 error = FT_New_Size( face, &size );
51 FT_Activate_Size( size );
54 error = FT_Set_Pixel_Sizes( face, scaler->width, scaler->height );
56 error = FT_Set_Char_Size( face,
57 (FT_F26Dot6)scaler->width,
58 (FT_F26Dot6)scaler->height,
73 typedef struct FTC_SizeNodeRec_
79 } FTC_SizeNodeRec, *FTC_SizeNode;
81 #define FTC_SIZE_NODE( x ) ( (FTC_SizeNode)( x ) )
84 FT_CALLBACK_DEF( void )
85 ftc_size_node_done( FTC_MruNode ftcnode,
88 FTC_SizeNode node = (FTC_SizeNode)ftcnode;
89 FT_Size size = node->size;
98 FT_CALLBACK_DEF( FT_Bool )
99 ftc_size_node_compare( FTC_MruNode ftcnode,
100 FT_Pointer ftcscaler )
102 FTC_SizeNode node = (FTC_SizeNode)ftcnode;
103 FTC_Scaler scaler = (FTC_Scaler)ftcscaler;
104 FTC_Scaler scaler0 = &node->scaler;
107 if ( FTC_SCALER_COMPARE( scaler0, scaler ) )
109 FT_Activate_Size( node->size );
116 FT_CALLBACK_DEF( FT_Error )
117 ftc_size_node_init( FTC_MruNode ftcnode,
118 FT_Pointer ftcscaler,
119 FT_Pointer ftcmanager )
121 FTC_SizeNode node = (FTC_SizeNode)ftcnode;
122 FTC_Scaler scaler = (FTC_Scaler)ftcscaler;
123 FTC_Manager manager = (FTC_Manager)ftcmanager;
126 node->scaler = scaler[0];
128 return ftc_scaler_lookup_size( manager, scaler, &node->size );
132 FT_CALLBACK_DEF( FT_Error )
133 ftc_size_node_reset( FTC_MruNode ftcnode,
134 FT_Pointer ftcscaler,
135 FT_Pointer ftcmanager )
137 FTC_SizeNode node = (FTC_SizeNode)ftcnode;
138 FTC_Scaler scaler = (FTC_Scaler)ftcscaler;
139 FTC_Manager manager = (FTC_Manager)ftcmanager;
142 FT_Done_Size( node->size );
144 node->scaler = scaler[0];
146 return ftc_scaler_lookup_size( manager, scaler, &node->size );
151 const FTC_MruListClassRec ftc_size_list_class =
153 sizeof ( FTC_SizeNodeRec ),
155 ftc_size_node_compare, /* FTC_MruNode_CompareFunc node_compare */
156 ftc_size_node_init, /* FTC_MruNode_InitFunc node_init */
157 ftc_size_node_reset, /* FTC_MruNode_ResetFunc node_reset */
158 ftc_size_node_done /* FTC_MruNode_DoneFunc node_done */
162 /* helper function used by ftc_face_node_done */
164 ftc_size_node_compare_faceid( FTC_MruNode ftcnode,
165 FT_Pointer ftcface_id )
167 FTC_SizeNode node = (FTC_SizeNode)ftcnode;
168 FTC_FaceID face_id = (FTC_FaceID)ftcface_id;
171 return FT_BOOL( node->scaler.face_id == face_id );
175 /* documentation is in ftcache.h */
177 FT_EXPORT_DEF( FT_Error )
178 FTC_Manager_LookupSize( FTC_Manager manager,
186 if ( !asize || !scaler )
187 return FT_THROW( Invalid_Argument );
192 return FT_THROW( Invalid_Cache_Handle );
196 FTC_MRULIST_LOOKUP_CMP( &manager->sizes, scaler, ftc_size_node_compare,
200 error = FTC_MruList_Lookup( &manager->sizes, scaler, &mrunode );
204 *asize = FTC_SIZE_NODE( mrunode )->size;
210 /*************************************************************************/
211 /*************************************************************************/
213 /***** FACE MRU IMPLEMENTATION *****/
215 /*************************************************************************/
216 /*************************************************************************/
218 typedef struct FTC_FaceNodeRec_
224 } FTC_FaceNodeRec, *FTC_FaceNode;
226 #define FTC_FACE_NODE( x ) ( ( FTC_FaceNode )( x ) )
229 FT_CALLBACK_DEF( FT_Error )
230 ftc_face_node_init( FTC_MruNode ftcnode,
231 FT_Pointer ftcface_id,
232 FT_Pointer ftcmanager )
234 FTC_FaceNode node = (FTC_FaceNode)ftcnode;
235 FTC_FaceID face_id = (FTC_FaceID)ftcface_id;
236 FTC_Manager manager = (FTC_Manager)ftcmanager;
240 node->face_id = face_id;
242 error = manager->request_face( face_id,
244 manager->request_data,
248 /* destroy initial size object; it will be re-created later */
249 if ( node->face->size )
250 FT_Done_Size( node->face->size );
257 FT_CALLBACK_DEF( void )
258 ftc_face_node_done( FTC_MruNode ftcnode,
259 FT_Pointer ftcmanager )
261 FTC_FaceNode node = (FTC_FaceNode)ftcnode;
262 FTC_Manager manager = (FTC_Manager)ftcmanager;
265 /* we must begin by removing all scalers for the target face */
266 /* from the manager's list */
267 FTC_MruList_RemoveSelection( &manager->sizes,
268 ftc_size_node_compare_faceid,
271 /* all right, we can discard the face now */
272 FT_Done_Face( node->face );
274 node->face_id = NULL;
278 FT_CALLBACK_DEF( FT_Bool )
279 ftc_face_node_compare( FTC_MruNode ftcnode,
280 FT_Pointer ftcface_id )
282 FTC_FaceNode node = (FTC_FaceNode)ftcnode;
283 FTC_FaceID face_id = (FTC_FaceID)ftcface_id;
286 return FT_BOOL( node->face_id == face_id );
291 const FTC_MruListClassRec ftc_face_list_class =
293 sizeof ( FTC_FaceNodeRec),
295 ftc_face_node_compare, /* FTC_MruNode_CompareFunc node_compare */
296 ftc_face_node_init, /* FTC_MruNode_InitFunc node_init */
297 NULL, /* FTC_MruNode_ResetFunc node_reset */
298 ftc_face_node_done /* FTC_MruNode_DoneFunc node_done */
302 /* documentation is in ftcache.h */
304 FT_EXPORT_DEF( FT_Error )
305 FTC_Manager_LookupFace( FTC_Manager manager,
314 return FT_THROW( Invalid_Argument );
319 return FT_THROW( Invalid_Cache_Handle );
321 /* we break encapsulation for the sake of speed */
324 FTC_MRULIST_LOOKUP_CMP( &manager->faces, face_id, ftc_face_node_compare,
328 error = FTC_MruList_Lookup( &manager->faces, face_id, &mrunode );
332 *aface = FTC_FACE_NODE( mrunode )->face;
338 /*************************************************************************/
339 /*************************************************************************/
341 /***** CACHE MANAGER ROUTINES *****/
343 /*************************************************************************/
344 /*************************************************************************/
347 /* documentation is in ftcache.h */
349 FT_EXPORT_DEF( FT_Error )
350 FTC_Manager_New( FT_Library library,
354 FTC_Face_Requester requester,
356 FTC_Manager *amanager )
360 FTC_Manager manager = NULL;
364 return FT_THROW( Invalid_Library_Handle );
366 if ( !amanager || !requester )
367 return FT_THROW( Invalid_Argument );
369 memory = library->memory;
371 if ( FT_QNEW( manager ) )
374 if ( max_faces == 0 )
375 max_faces = FTC_MAX_FACES_DEFAULT;
377 if ( max_sizes == 0 )
378 max_sizes = FTC_MAX_SIZES_DEFAULT;
380 if ( max_bytes == 0 )
381 max_bytes = FTC_MAX_BYTES_DEFAULT;
383 manager->library = library;
384 manager->memory = memory;
385 manager->max_weight = max_bytes;
386 manager->cur_weight = 0;
388 manager->request_face = requester;
389 manager->request_data = req_data;
391 FTC_MruList_Init( &manager->faces,
392 &ftc_face_list_class,
397 FTC_MruList_Init( &manager->sizes,
398 &ftc_size_list_class,
403 manager->nodes_list = NULL;
404 manager->num_nodes = 0;
405 manager->num_caches = 0;
414 /* documentation is in ftcache.h */
416 FT_EXPORT_DEF( void )
417 FTC_Manager_Done( FTC_Manager manager )
423 if ( !manager || !manager->library )
426 memory = manager->memory;
428 /* now discard all caches */
429 for ( idx = manager->num_caches; idx-- > 0; )
431 FTC_Cache cache = manager->caches[idx];
436 cache->clazz.cache_done( cache );
438 manager->caches[idx] = NULL;
441 manager->num_caches = 0;
443 /* discard faces and sizes */
444 FTC_MruList_Done( &manager->sizes );
445 FTC_MruList_Done( &manager->faces );
447 manager->library = NULL;
448 manager->memory = NULL;
454 /* documentation is in ftcache.h */
456 FT_EXPORT_DEF( void )
457 FTC_Manager_Reset( FTC_Manager manager )
462 FTC_MruList_Reset( &manager->sizes );
463 FTC_MruList_Reset( &manager->faces );
465 FTC_Manager_FlushN( manager, manager->num_nodes );
469 #ifdef FT_DEBUG_ERROR
472 FTC_Manager_Check( FTC_Manager manager )
474 FTC_Node node, first;
477 first = manager->nodes_list;
479 /* check node weights */
482 FT_Offset weight = 0;
489 FTC_Cache cache = manager->caches[node->cache_index];
492 if ( node->cache_index >= manager->num_caches )
493 FT_TRACE0(( "FTC_Manager_Check: invalid node (cache index = %hu\n",
494 node->cache_index ));
496 weight += cache->clazz.node_weight( node, cache );
498 node = FTC_NODE_NEXT( node );
500 } while ( node != first );
502 if ( weight != manager->cur_weight )
503 FT_TRACE0(( "FTC_Manager_Check: invalid weight %ld instead of %ld\n",
504 manager->cur_weight, weight ));
507 /* check circular list */
517 node = FTC_NODE_NEXT( node );
519 } while ( node != first );
521 if ( count != manager->num_nodes )
522 FT_TRACE0(( "FTC_Manager_Check:"
523 " invalid cache node count %u instead of %u\n",
524 manager->num_nodes, count ));
528 #endif /* FT_DEBUG_ERROR */
531 /* `Compress' the manager's data, i.e., get rid of old cache nodes */
532 /* that are not referenced anymore in order to limit the total */
533 /* memory used by the cache. */
535 /* documentation is in ftcmanag.h */
538 FTC_Manager_Compress( FTC_Manager manager )
540 FTC_Node node, prev, first;
546 first = manager->nodes_list;
548 #ifdef FT_DEBUG_ERROR
549 FTC_Manager_Check( manager );
551 FT_TRACE0(( "compressing, weight = %ld, max = %ld, nodes = %u\n",
552 manager->cur_weight, manager->max_weight,
553 manager->num_nodes ));
556 if ( manager->cur_weight < manager->max_weight || !first )
559 /* go to last node -- it's a circular list */
560 prev = FTC_NODE_PREV( first );
564 prev = FTC_NODE_PREV( node );
566 if ( node->ref_count <= 0 )
567 ftc_node_destroy( node, manager );
569 } while ( node != first && manager->cur_weight > manager->max_weight );
573 /* documentation is in ftcmanag.h */
575 FT_LOCAL_DEF( FT_Error )
576 FTC_Manager_RegisterCache( FTC_Manager manager,
577 FTC_CacheClass clazz,
580 FT_Error error = FT_ERR( Invalid_Argument );
581 FTC_Cache cache = NULL;
584 if ( manager && clazz && acache )
586 FT_Memory memory = manager->memory;
589 if ( manager->num_caches >= FTC_MAX_CACHES )
591 error = FT_THROW( Too_Many_Caches );
592 FT_ERROR(( "FTC_Manager_RegisterCache:"
593 " too many registered caches\n" ));
597 if ( !FT_QALLOC( cache, clazz->cache_size ) )
599 cache->manager = manager;
600 cache->memory = memory;
601 cache->clazz = clazz[0];
602 cache->org_class = clazz;
604 /* THIS IS VERY IMPORTANT! IT WILL WRETCH THE MANAGER */
605 /* IF IT IS NOT SET CORRECTLY */
606 cache->index = manager->num_caches;
608 error = clazz->cache_init( cache );
611 clazz->cache_done( cache );
616 manager->caches[manager->num_caches++] = cache;
627 FT_LOCAL_DEF( FT_UInt )
628 FTC_Manager_FlushN( FTC_Manager manager,
631 FTC_Node first = manager->nodes_list;
636 /* try to remove `count' nodes from the list */
637 if ( !first || !count )
640 /* go to last node -- it's a circular list */
641 prev = FTC_NODE_PREV( first );
645 prev = FTC_NODE_PREV( node );
647 /* don't touch locked nodes */
648 if ( node->ref_count <= 0 )
650 ftc_node_destroy( node, manager );
653 } while ( node != first && result < count );
659 /* documentation is in ftcache.h */
661 FT_EXPORT_DEF( void )
662 FTC_Manager_RemoveFaceID( FTC_Manager manager,
671 /* this will remove all FTC_SizeNode that correspond to
672 * the face_id as well
674 FTC_MruList_RemoveSelection( &manager->faces,
675 ftc_face_node_compare,
678 for ( nn = 0; nn < manager->num_caches; nn++ )
679 FTC_Cache_RemoveFaceID( manager->caches[nn], face_id );
683 /* documentation is in ftcache.h */
685 FT_EXPORT_DEF( void )
686 FTC_Node_Unref( FTC_Node node,
687 FTC_Manager manager )
691 node->cache_index < manager->num_caches )