+++ /dev/null
-/***************************************************************************/
-/* */
-/* ftextend.c */
-/* */
-/* FreeType extensions implementation (body). */
-/* */
-/* Copyright 1996-2001 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. */
-/* */
-/***************************************************************************/
-
- /*************************************************************************/
- /* */
- /* This is an updated version of the extension component, now located */
- /* in the main library's source directory. It allows the dynamic */
- /* registration/use of various face object extensions through a simple */
- /* API. */
- /* */
- /*************************************************************************/
-
-
-#include <ft2build.h>
-#include FT_INTERNAL_EXTEND_H
-#include FT_INTERNAL_DEBUG_H
-
-
- /*************************************************************************/
- /* */
- /* The macro FT_COMPONENT is used in trace mode. It is an implicit */
- /* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
- /* messages during execution. */
- /* */
-#undef FT_COMPONENT
-#define FT_COMPONENT trace_extend
-
-
- typedef struct FT_Extension_Registry_
- {
- FT_Int num_extensions;
- FT_Long cur_offset;
- FT_Extension_Class classes[FT_MAX_EXTENSIONS];
-
- } FT_Extension_Registry;
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Init_Extensions */
- /* */
- /* <Description> */
- /* Initializes the extension component. */
- /* */
- /* <InOut> */
- /* driver :: A handle to the driver object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- FT_LOCAL_DEF FT_Error
- FT_Init_Extensions( FT_Driver driver )
- {
- FT_Error error;
- FT_Memory memory;
- FT_Extension_Registry* registry;
-
-
- memory = driver->root.library->memory;
- if ( ALLOC( registry, sizeof ( *registry ) ) )
- return error;
-
- registry->num_extensions = 0;
- registry->cur_offset = 0;
- driver->extensions = registry;
-
- FT_TRACE2(( "FT_Init_Extensions: success\n" ));
-
- return FT_Err_Ok;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Done_Extensions */
- /* */
- /* <Description> */
- /* Finalizes the extension component. */
- /* */
- /* <InOut> */
- /* driver :: A handle to the driver object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- FT_LOCAL_DEF FT_Error
- FT_Done_Extensions( FT_Driver driver )
- {
- FT_Memory memory = driver->root.memory;
-
-
- FREE( driver->extensions );
- return FT_Err_Ok;
- }
-
-
- /* documentation is in ftextend.h */
-
- FT_EXPORT_DEF( FT_Error )
- FT_Register_Extension( FT_Driver driver,
- FT_Extension_Class* clazz )
- {
- FT_Extension_Registry* registry;
-
-
- if ( !driver )
- return FT_Err_Invalid_Driver_Handle;
-
- if ( !clazz )
- return FT_Err_Invalid_Argument;
-
- registry = (FT_Extension_Registry*)driver->extensions;
- if ( registry )
- {
- FT_Int n = registry->num_extensions;
- FT_Extension_Class* cur = registry->classes + n;
-
-
- if ( n >= FT_MAX_EXTENSIONS )
- return FT_Err_Too_Many_Extensions;
-
- *cur = *clazz;
-
- cur->offset = registry->cur_offset;
-
- registry->num_extensions++;
- registry->cur_offset +=
- ( cur->size + FT_ALIGNMENT - 1 ) & -FT_ALIGNMENT;
-
- FT_TRACE1(( "FT_Register_Extension: `%s' successfully registered\n",
- cur->id ));
- }
-
- return FT_Err_Ok;
- }
-
-
- /* documentation is in ftextend.h */
-
- FT_EXPORT_DEF( void* )
- FT_Get_Extension( FT_Face face,
- const char* extension_id,
- void** extension_interface )
- {
- FT_Extension_Registry* registry;
-
-
- if ( !face || !extension_id || !extension_interface )
- return 0;
-
- registry = (FT_Extension_Registry*)face->driver->extensions;
- if ( registry && face->extensions )
- {
- FT_Extension_Class* cur = registry->classes;
- FT_Extension_Class* limit = cur + registry->num_extensions;
-
-
- for ( ; cur < limit; cur++ )
- if ( strcmp( cur->id, extension_id ) == 0 )
- {
- *extension_interface = cur->interface;
-
- FT_TRACE1(( "FT_Get_Extension: got `%s'\n", extension_id ));
-
- return (void*)((char*)face->extensions + cur->offset);
- }
- }
-
- /* could not find the extension id */
-
- FT_ERROR(( "FT_Get_Extension: couldn't find `%s'\n", extension_id ));
-
- *extension_interface = 0;
-
- return 0;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Destroy_Extensions */
- /* */
- /* <Description> */
- /* Destroys all extensions within a face object. */
- /* */
- /* <InOut> */
- /* face :: A handle to the face object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <Note> */
- /* Called by the face object destructor. */
- /* */
- FT_LOCAL_DEF FT_Error
- FT_Destroy_Extensions( FT_Face face )
- {
- FT_Extension_Registry* registry;
- FT_Memory memory;
-
-
- registry = (FT_Extension_Registry*)face->driver->extensions;
- if ( registry && face->extensions )
- {
- FT_Extension_Class* cur = registry->classes;
- FT_Extension_Class* limit = cur + registry->num_extensions;
-
-
- for ( ; cur < limit; cur++ )
- {
- char* ext = (char*)face->extensions + cur->offset;
-
- if ( cur->finalize )
- cur->finalize( ext, face );
- }
-
- memory = face->driver->root.memory;
- FREE( face->extensions );
- }
-
- return FT_Err_Ok;
- }
-
-
- /*************************************************************************/
- /* */
- /* <Function> */
- /* FT_Create_Extensions */
- /* */
- /* <Description> */
- /* Creates an extension object within a face object for all */
- /* registered extensions. */
- /* */
- /* <InOut> */
- /* face :: A handle to the face object. */
- /* */
- /* <Return> */
- /* FreeType error code. 0 means success. */
- /* */
- /* <Note> */
- /* Called by the face object constructor. */
- /* */
- FT_LOCAL_DEF FT_Error
- FT_Create_Extensions( FT_Face face )
- {
- FT_Extension_Registry* registry;
- FT_Memory memory;
- FT_Error error;
-
-
- face->extensions = 0;
-
- /* load extensions registry; exit successfully if none is there */
-
- registry = (FT_Extension_Registry*)face->driver->extensions;
- if ( !registry )
- return FT_Err_Ok;
-
- memory = face->driver->root.memory;
- if ( ALLOC( face->extensions, registry->cur_offset ) )
- return error;
-
- {
- FT_Extension_Class* cur = registry->classes;
- FT_Extension_Class* limit = cur + registry->num_extensions;
-
-
- for ( ; cur < limit; cur++ )
- {
- char* ext = (char*)face->extensions + cur->offset;
-
- if ( cur->init )
- {
- error = cur->init( ext, face );
- if ( error )
- break;
- }
- }
- }
-
- return error;
- }
-
-
-/* END */
projects / rrdtool.git / blobdiff