ref: 91e52d416aedfdfcf5b4331c2156a3866898738e
dir: /src/base/ftobjs.c/
/***************************************************************************/
/* */
/* ftobjs.c */
/* */
/* The FreeType private base classes (base). */
/* */
/* Copyright 1996-2000 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/internal/ftobjs.h>
#include <freetype/internal/ftlist.h>
#include <freetype/internal/ftdebug.h>
#include <freetype/internal/ftstream.h>
#include <freetype/tttables.h>
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M E M O R Y ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* 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_memory
/*************************************************************************/
/* */
/* <Function> */
/* FT_Alloc */
/* */
/* <Description> */
/* Allocates a new block of memory. The returned area is always */
/* zero-filled; this is a strong convention in many FreeType parts. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* allocation. */
/* */
/* size :: The size in bytes of the block to allocate. */
/* */
/* <Output> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
BASE_FUNC( FT_Error ) FT_Alloc( FT_Memory memory,
FT_Long size,
void** P )
{
FT_Assert( P != 0 );
if ( size > 0 )
{
*P = memory->alloc( memory, size );
if ( !*P )
{
FT_ERROR(( "FT_Alloc:" ));
FT_ERROR(( " Out of memory? (%ld requested)\n",
size ));
return FT_Err_Out_Of_Memory;
}
MEM_Set( *P, 0, size );
}
else
*P = NULL;
FT_TRACE2(( "FT_Alloc:" ));
FT_TRACE2(( " size = %ld, block = 0x%08p, ref = 0x%08p\n",
size, *P, P ));
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Realloc */
/* */
/* <Description> */
/* Reallocates a block of memory pointed to by `*P' to `Size' bytes */
/* from the heap, possibly changing `*P'. */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* reallocation. */
/* */
/* current :: The current block size in bytes. */
/* */
/* size :: The new block size in bytes. */
/* */
/* <InOut> */
/* P :: A pointer to the fresh new block. It should be set to */
/* NULL if `size' is 0, or in case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* All callers of FT_Realloc() _must_ provide the current block size */
/* as well as the new one. */
/* */
BASE_FUNC( FT_Error ) FT_Realloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P )
{
void* Q;
FT_Assert( P != 0 );
/* if the original pointer is NULL, call FT_Alloc() */
if ( !*P )
return FT_Alloc( memory, size, P );
/* if the new block if zero-sized, clear the current one */
if ( size <= 0 )
{
FT_Free( memory, P );
return FT_Err_Ok;
}
Q = memory->realloc( memory, current, size, *P );
if ( !Q )
goto Fail;
*P = Q;
return FT_Err_Ok;
Fail:
FT_ERROR(( "FT_Realloc:" ));
FT_ERROR(( " Failed (current %ld, requested %ld)\n",
current, size ));
return FT_Err_Out_Of_Memory;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Free */
/* */
/* <Description> */
/* Releases a given block of memory allocated through FT_Alloc(). */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' which handles */
/* memory deallocation */
/* */
/* P :: This is the _address_ of a _pointer_ which points to the */
/* allocated block. It is always set to NULL on exit. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If P or *P are NULL, this function should return successfully. */
/* This is a strong convention within all of FreeType and its */
/* drivers. */
/* */
BASE_FUNC( void ) FT_Free( FT_Memory memory,
void** P )
{
FT_TRACE2(( "FT_Free:" ));
FT_TRACE2(( " Freeing block 0x%08p, ref 0x%08p\n",
P, P ? *P : (void*)0 ));
FT_Assert( P != 0 );
if ( *P )
{
memory->free( memory, *P );
*P = 0;
}
}
/*************************************************************************/
/* */
/* <Function> */
/* ft_new_input_stream */
/* */
/* <Description> */
/* Creates a new input stream object from an FT_Open_Args structure. */
/* */
/* <Note> */
/* The function expects a valid `astream' parameter. */
static
FT_Error ft_new_input_stream( FT_Library library,
FT_Open_Args* args,
FT_Stream* astream )
{
FT_Error error;
FT_Memory memory;
FT_Stream stream;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !args )
return FT_Err_Invalid_Argument;
*astream = 0;
memory = library->memory;
if ( ALLOC( stream, sizeof ( *stream ) ) )
goto Exit;
stream->memory = memory;
/* now, look at the stream flags */
if ( args->flags & ft_open_memory )
{
error = 0;
FT_New_Memory_Stream( library,
args->memory_base,
args->memory_size,
stream );
}
else if ( args->flags & ft_open_pathname )
{
error = FT_New_Stream( args->pathname, stream );
stream->pathname.pointer = args->pathname;
}
else if ( args->flags & ft_open_stream && args->stream )
{
*stream = *(args->stream);
stream->memory = memory;
}
else
error = FT_Err_Invalid_Argument;
if ( error )
FREE( stream );
*astream = stream;
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Stream */
/* */
/* <Description> */
/* Closes and destroys a stream object. */
/* */
/* <Input> */
/* stream :: The stream to be closed and destroyed. */
/* */
FT_EXPORT_FUNC( void ) FT_Done_Stream( FT_Stream stream )
{
if ( stream && stream->close )
stream->close( stream );
}
static
void ft_done_stream( FT_Stream* astream )
{
FT_Stream stream = *astream;
FT_Memory memory = stream->memory;
if ( stream->close )
stream->close( stream );
FREE( stream );
*astream = 0;
}
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** O B J E C T M A N A G E M E N T ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* destructor for sizes list */
static
void destroy_size( FT_Memory memory,
FT_Size size,
FT_Driver driver )
{
/* finalize format-specific stuff */
driver->interface.done_size( size );
FREE( size );
}
/* destructor for faces list */
static
void destroy_face( FT_Memory memory,
FT_Face face,
FT_Driver driver )
{
/* Discard glyph slots for this face */
/* XXX: Beware! FT_Done_GlyphSlot() changes the field `face->slot' */
while ( face->glyph )
FT_Done_GlyphSlot( face->glyph );
/* Discard all sizes for this face */
FT_List_Finalize( &face->sizes_list,
(FT_List_Destructor)destroy_size,
memory,
driver );
face->size = 0;
/* finalize format-specific stuff */
driver->interface.done_face( face );
/* Now discard client data */
if ( face->generic.finalizer )
face->generic.finalizer( face );
/* close the stream for this face */
ft_done_stream( &face->stream );
/* get rid of it */
FREE( face );
}
/*************************************************************************/
/* */
/* <Function> */
/* Destroy_Driver */
/* */
/* <Description> */
/* Destroys a given driver object. This also destroys all child */
/* faces. */
/* */
/* <InOut> */
/* driver :: A handle to the target driver object. */
/* */
/* <Note> */
/* The driver _must_ be LOCKED! */
/* */
static
void Destroy_Driver( FT_Driver driver )
{
FT_Memory memory = driver->memory;
/* now, finalize all faces in the driver list */
FT_List_Finalize( &driver->faces_list,
(FT_List_Destructor)destroy_face,
memory,
driver );
/* finalize the driver object */
if ( driver->interface.done_driver )
driver->interface.done_driver( driver );
/* finalize client-data */
if ( driver->generic.finalizer )
driver->generic.finalizer( driver );
/* discard it */
FREE( driver );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Raster */
/* */
/* <Description> */
/* Returns the raster interface corresponding to a given glyph format */
/* tag. */
/* */
/* <Input> */
/* library :: A handle to the source library object. */
/* */
/* glyph_format :: The glyph format tag. */
/* */
/* <Output> */
/* raster_funcs :: If this field is not 0, the raster's interface */
/* functions are returned. */
/* */
/* <Return> */
/* A pointer to the corresponding raster object. */
/* */
FT_EXPORT_FUNC( FT_Raster ) FT_Get_Raster(
FT_Library library,
FT_Glyph_Format glyph_format,
FT_Raster_Funcs* raster_funcs )
{
FT_Int n;
if ( !library )
return 0;
for ( n = 0; n < FT_MAX_GLYPH_FORMATS; n++ )
{
FT_Raster_Funcs* funcs = &library->raster_funcs[n];
if ( funcs->glyph_format == glyph_format )
{
if ( raster_funcs )
*raster_funcs = *funcs;
return library->rasters[n];
}
}
return 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Raster */
/* */
/* <Description> */
/* Registers a given raster to the library. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* */
/* raster_funcs :: A pointer to the raster's interface functions. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will do the following: */
/* */
/* - A new raster object is created through `raster_func.raster_new'. */
/* If this fails, the function returns. */
/* */
/* - If a raster is already registered for the glyph format */
/* specified in raster_funcs, it will be destroyed. */
/* */
/* - The new raster is registered for the glyph format. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Raster( FT_Library library,
FT_Raster_Funcs* raster_funcs )
{
FT_Glyph_Format glyph_format;
FT_Raster_Funcs* funcs;
FT_Raster raster;
FT_Error error;
FT_Int n, index;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !raster_funcs )
return FT_Err_Invalid_Argument;
glyph_format = raster_funcs->glyph_format;
if ( glyph_format == ft_glyph_format_none )
return FT_Err_Invalid_Argument;
/* create a new raster object */
error = raster_funcs->raster_new( library->memory, &raster );
if ( error )
goto Exit;
raster_funcs->raster_reset( raster,
library->raster_pool,
library->raster_pool_size );
index = -1;
for ( n = 0; n < FT_MAX_GLYPH_FORMATS; n++ )
{
FT_Raster_Funcs* funcs = library->raster_funcs + n;
/* record the first vacant entry in `index' */
if ( index < 0 && funcs->glyph_format == ft_glyph_format_none )
index = n;
/* compare this entry's glyph format with the one we need */
if ( funcs->glyph_format == glyph_format )
{
/* A raster already exists for this glyph format. We will */
/* destroy it before updating its entry in the table. */
funcs->raster_done( library->rasters[n] );
index = n;
break;
}
}
if ( index < 0 )
{
/* the table is full and has no vacant entries */
error = FT_Err_Too_Many_Glyph_Formats;
goto Fail;
}
funcs = library->raster_funcs + index;
*funcs = *raster_funcs;
library->rasters[index] = raster;
Exit:
return error;
Fail:
raster_funcs->raster_done( raster );
goto Exit;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Unset_Raster */
/* */
/* <Description> */
/* Removes a given raster from the library. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* */
/* raster_funcs :: A pointer to the raster's interface functions. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_DEF( FT_Error ) FT_Unset_Raster(
FT_Library library,
FT_Raster_Funcs* raster_funcs )
{
FT_Glyph_Format glyph_format;
FT_Error error;
FT_Int n;
if ( !library )
return FT_Err_Invalid_Library_Handle;
error = FT_Err_Invalid_Argument;
if ( !raster_funcs )
goto Exit;
glyph_format = raster_funcs->glyph_format;
if ( glyph_format == ft_glyph_format_none )
goto Exit;
for ( n = 0; n < FT_MAX_GLYPH_FORMATS; n++ )
{
FT_Raster_Funcs* funcs = library->raster_funcs + n;
if ( funcs->glyph_format == glyph_format )
{
funcs->raster_done( library->rasters[n] );
library->rasters[n] = 0;
library->raster_funcs[n].glyph_format = ft_glyph_format_none;
error = FT_Err_Ok;
break;
}
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Raster_Mode */
/* */
/* <Description> */
/* Sets a raster-specific mode. */
/* */
/* <InOut> */
/* library :: A handle to a target library object. */
/* */
/* <Input> */
/* format :: The glyph format used to select the raster. */
/* */
/* mode :: The raster-specific mode descriptor. */
/* */
/* args :: The mode arguments. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Raster_Mode( FT_Library library,
FT_Glyph_Format format,
unsigned long mode,
void* args )
{
FT_Raster_Funcs funcs;
FT_Raster raster;
if ( !library )
return FT_Err_Invalid_Library_Handle;
raster = FT_Get_Raster( library, format, &funcs );
if ( raster && args && funcs.raster_set_mode )
return funcs.raster_set_mode( raster, mode, args );
else
return FT_Err_Invalid_Argument;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Debug_Hook */
/* */
/* <Description> */
/* Sets a debug hook function for debugging the interpreter of a */
/* font format. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* */
/* hook_index :: The index of the debug hook. You should use the */
/* values defined in ftobjs.h, e.g. */
/* FT_DEBUG_HOOK_TRUETYPE */
/* */
/* debug_hook :: The function used to debug the interpreter. */
/* */
/* <Note> */
/* Currently, four debug hook slots are available, but only two (for */
/* the TrueType and the Type 1 interpreter) are defined. */
/* */
FT_EXPORT_FUNC( void ) FT_Set_Debug_Hook( FT_Library library,
FT_UInt hook_index,
FT_DebugHook_Func debug_hook )
{
if ( library && debug_hook &&
hook_index <
( sizeof ( library->debug_hooks ) / sizeof ( void* ) ) )
library->debug_hooks[hook_index] = debug_hook;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Library */
/* */
/* <Description> */
/* This function is used to create a new FreeType library instance */
/* from a given memory object. It is thus possible to use libraries */
/* with distinct memory allocators within the same program. */
/* */
/* <Input> */
/* memory :: A handle to the original memory object. */
/* */
/* <Output> */
/* alibrary :: A pointer to handle of a new library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Library( FT_Memory memory,
FT_Library* alibrary )
{
FT_Library library = 0;
FT_Error error;
if ( !memory )
return FT_Err_Invalid_Argument;
/* first of all, allocate the library object */
if ( ALLOC( library, sizeof ( *library ) ) )
return error;
library->memory = memory;
/* allocate the render pool */
library->raster_pool_size = FT_RENDER_POOL_SIZE;
if ( ALLOC( library->raster_pool, FT_RENDER_POOL_SIZE ) )
goto Fail;
/* now register the default raster for the `outline' glyph image */
/* format for now, ignore the error... */
error = FT_Set_Raster( library, &ft_default_raster );
/* That's ok now */
*alibrary = library;
return FT_Err_Ok;
Fail:
FREE( library );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Library */
/* */
/* <Description> */
/* Discards a given library object. This closes all drivers and */
/* discards all resource objects. */
/* */
/* <Input> */
/* library :: A handle to the target library. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Library( FT_Library library )
{
FT_Memory memory;
FT_Int n;
if ( !library )
return FT_Err_Invalid_Library_Handle;
memory = library->memory;
/* Discard client-data */
if ( library->generic.finalizer )
library->generic.finalizer( library );
/* Close all drivers in the library */
for ( n = 0; n < library->num_drivers; n++ )
{
FT_Driver driver = library->drivers[n];
if ( driver )
{
Destroy_Driver( driver );
library->drivers[n] = 0;
}
}
/* Destroy raster objects */
FREE( library->raster_pool );
library->raster_pool_size = 0;
{
FT_Raster_Funcs* cur = library->raster_funcs;
FT_Raster_Funcs* limit = cur + FT_MAX_GLYPH_FORMATS;
FT_Raster* raster = library->rasters;
for ( ; cur < limit; cur++, raster++ )
{
if ( cur->glyph_format != ft_glyph_format_none )
{
cur->raster_done( *raster );
*raster = 0;
cur->glyph_format = ft_glyph_format_none;
}
}
}
FREE( library );
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Add_Driver */
/* */
/* <Description> */
/* Registers a new driver in a given library object. This function */
/* takes only a pointer to a driver interface; it uses it to create */
/* the new driver, then sets up some important fields. */
/* */
/* <InOut> */
/* library :: A handle to the target library object. */
/* */
/* <Input> */
/* driver_interface :: A pointer to a driver interface table. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function doesn't check whether the driver is already */
/* installed! */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Add_Driver(
FT_Library library,
const FT_DriverInterface* driver_interface )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
if ( !library )
return FT_Err_Invalid_Library_Handle;
if ( !driver_interface )
return FT_Err_Invalid_Argument;
memory = library->memory;
error = FT_Err_Ok;
if ( library->num_drivers >= FT_MAX_DRIVERS )
error = FT_Err_Too_Many_Drivers;
else
{
if ( ALLOC( driver, driver_interface->driver_object_size ) )
goto Exit;
driver->library = library;
driver->memory = memory;
driver->interface = *driver_interface;
if ( driver_interface->init_driver )
{
error = driver_interface->init_driver( driver );
if ( error )
goto Fail;
}
library->drivers[library->num_drivers++] = driver;
goto Exit;
Fail:
FREE( driver );
}
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Remove_Driver */
/* */
/* <Description> */
/* Unregisters a given driver. This closes the driver, which in turn */
/* destroys all faces, sizes, slots, etc. associated with it. */
/* */
/* This function also DESTROYS the driver object. */
/* */
/* <Input> */
/* driver :: A handle to target driver object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Remove_Driver( FT_Driver driver )
{
FT_Library library;
FT_Memory memory;
FT_Driver *cur, *last;
FT_Error error;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
library = driver->library;
memory = driver->memory;
if ( !library || !memory )
return FT_Err_Invalid_Driver_Handle;
/* look-up driver entry in library table */
error = FT_Err_Invalid_Driver_Handle;
cur = library->drivers;
last = cur + library->num_drivers - 1;
for ( ; cur <= last; cur++ )
{
if ( *cur == driver )
{
/* destroy the driver object */
Destroy_Driver( driver );
/* now move the last driver in the table to the vacant slot */
if ( cur < last )
{
*cur = *last;
*last = 0;
}
library->num_drivers--;
/* exit loop */
error = FT_Err_Ok;
break;
}
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Driver */
/* */
/* <Description> */
/* Returns the handle of the driver responsible for a given format */
/* (or service) according to its `name'. */
/* */
/* <Input> */
/* library :: A handle to the library object. */
/* driver_name :: The name of the driver to look up. */
/* */
/* <Return> */
/* A handle to the driver object, 0 otherwise. */
/* */
FT_EXPORT_FUNC( FT_Driver ) FT_Get_Driver( FT_Library library,
char* driver_name )
{
FT_Driver *cur, *limit;
if ( !library || !driver_name )
return 0;
cur = library->drivers;
limit = cur + library->num_drivers;
for ( ; cur < limit; cur++ )
{
if ( strcmp( (*cur)->interface.driver_name, driver_name ) == 0 )
return *cur;
}
return 0;
}
/*************************************************************************/
/* */
/* <Function> */
/* open_face */
/* */
/* <Description> */
/* This function does some work for FT_Open_Face(). */
/* */
static
FT_Error open_face( FT_Driver driver,
FT_Stream stream,
FT_Long face_index,
FT_Int num_params,
FT_Parameter* params,
FT_Face* aface )
{
FT_Memory memory;
FT_DriverInterface* interface;
FT_Face face = 0;
FT_Error error;
interface = &driver->interface;
memory = driver->memory;
/* allocate the face object, and perform basic initialization */
if ( ALLOC( face, interface->face_object_size ) )
goto Fail;
face->driver = driver;
face->memory = memory;
face->stream = stream;
error = interface->init_face( stream,
face,
face_index,
num_params,
params );
if ( error )
goto Fail;
*aface = face;
Fail:
if ( error )
{
interface->done_face( face );
FREE( face );
*aface = 0;
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a pathname to the font file. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* pathname :: A path to the font file. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Face( FT_Library library,
const char* pathname,
FT_Long face_index,
FT_Face* aface )
{
FT_Open_Args args;
/* test for valid `library' and `aface' delayed to FT_Open_Face() */
if ( !pathname )
return FT_Err_Invalid_Argument;
args.flags = ft_open_pathname;
args.pathname = (char*)pathname;
return FT_Open_Face( library, &args, face_index, aface );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Memory_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a font file already loaded into memory. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* file_base :: A pointer to the beginning of the font data. */
/* */
/* file_size :: The size of the memory chunk used by the font data. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* face :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Memory_Face() can be used to determine and/or check the */
/* font format of a given font resource. If the `face_index' field */
/* is negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Memory_Face( FT_Library library,
void* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face* face )
{
FT_Open_Args args;
/* test for valid `library' and `face' delayed to FT_Open_Face() */
if ( !file_base )
return FT_Err_Invalid_Argument;
args.flags = ft_open_memory;
args.memory_base = file_base;
args.memory_size = file_size;
return FT_Open_Face( library, &args, face_index, face );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Open_Face */
/* */
/* <Description> */
/* Opens a face object from a given resource and typeface index using */
/* an `FT_Open_Args' structure. If the face object doesn't exist, it */
/* will be created. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* args :: A pointer to an `FT_Open_Args' structure which must */
/* be filled by the caller. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_Open_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Open_Face( FT_Library library,
FT_Open_Args* args,
FT_Long face_index,
FT_Face* aface )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_Face face = 0;
FT_ListNode node = 0;
/* test for valid `library' and `args' delayed to */
/* ft_new_input_stream() */
if ( !aface )
return FT_Err_Invalid_Argument;
*aface = 0;
/* create input stream */
error = ft_new_input_stream( library, args, &stream );
if ( error )
goto Exit;
memory = library->memory;
/* If the font driver is specified in the `args' structure, use */
/* it. Otherwise, we'll scan the list of registered drivers. */
if ( args->flags & ft_open_driver && args->driver )
{
driver = args->driver;
/* not all drivers directly support face objects, so check... */
if ( driver->interface.face_object_size )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
if ( args->flags & ft_open_params )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
}
else
error = FT_Err_Invalid_Handle;
goto Fail;
}
else
{
/* check each font driver for an appropriate format */
FT_Driver* cur = library->drivers;
FT_Driver* limit = cur + library->num_drivers;
for ( ; cur < limit; cur++ )
{
driver = *cur;
/* not all drivers directly support face objects, so check... */
if ( driver->interface.face_object_size )
{
FT_Int num_params = 0;
FT_Parameter* params = 0;
if ( args->flags & ft_open_params )
{
num_params = args->num_params;
params = args->params;
}
error = open_face( driver, stream, face_index,
num_params, params, &face );
if ( !error )
goto Success;
if ( error != FT_Err_Unknown_File_Format )
goto Fail;
}
}
/* no driver is able to handle this format */
error = FT_Err_Unknown_File_Format;
goto Fail;
}
Success:
FT_TRACE4(( "FT_New_Face: New face object, adding to list\n" ));
/* add the face object to its driver's list */
if ( ALLOC( node, sizeof ( *node ) ) )
goto Fail;
node->data = face;
/* don't assume driver is the same as face->driver, so use */
/* face->driver instead. */
FT_List_Add( &face->driver->faces_list, node );
/* now allocate a glyph slot object for the face */
{
FT_GlyphSlot slot;
FT_TRACE4(( "FT_Open_Face: Creating glyph slot\n" ));
error = FT_New_GlyphSlot( face, &slot );
if ( error )
goto Fail;
}
/* finally, allocate a size object for the face */
{
FT_Size size;
FT_TRACE4(( "FT_Open_Face: Creating size object\n" ));
error = FT_New_Size( face, &size );
if ( error )
goto Fail;
}
/* initialize transformation for convenience functions */
face->transform_matrix.xx = 0x10000L;
face->transform_matrix.xy = 0;
face->transform_matrix.yx = 0;
face->transform_matrix.yy = 0x10000L;
face->transform_delta.x = 0;
face->transform_delta.y = 0;
*aface = face;
goto Exit;
Fail:
FT_Done_Face( face );
Exit:
FT_TRACE4(( "FT_Open_Face: Return %d\n", error ));
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* `Attaches' a given font file to an existing face. This is usually */
/* to read additional information for a single face object. For */
/* example, it is used to read the AFM files that come with Type 1 */
/* fonts in order to add kerning data and other metrics. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* filepathname :: An 8-bit pathname naming the `metrics' file. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, use FT_Attach_Stream(). */
/* */
/* The meaning of the `attach' action (i.e., what really happens when */
/* the new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Attach_File( FT_Face face,
const char* filepathname )
{
FT_Open_Args open;
/* test for valid `face' delayed to FT_Attach_Stream() */
if ( !filepathname )
return FT_Err_Invalid_Argument;
open.flags = ft_open_pathname;
open.pathname = (char*)filepathname;
return FT_Attach_Stream( face, &open );
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* This function is similar to FT_Attach_File() with the exception */
/* that it reads the attachment from an arbitrary stream. */
/* */
/* <Input> */
/* face :: The target face object. */
/* */
/* parameters :: A pointer to an FT_Open_Args structure used to */
/* describe the input stream to FreeType. */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The meaning of the `attach' (i.e. what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters )
{
FT_Stream stream;
FT_Error error;
FT_Driver driver;
FTDriver_getInterface get_interface;
/* test for valid `parameters' delayed to ft_new_input_stream() */
if ( !face )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
error = ft_new_input_stream( driver->library, parameters, &stream );
if ( error )
goto Exit;
/* we implement FT_Attach_Stream in each driver through the */
/* `attach_file' interface */
error = FT_Err_Unimplemented_Feature;
get_interface = driver->interface.get_interface;
if ( get_interface )
{
FT_Attach_Reader reader;
reader = (FT_Attach_Reader)(get_interface( driver, "attach_file" ));
if ( reader )
error = reader( face, stream );
}
/* close the attached stream */
ft_done_stream( &stream );
Exit:
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Face */
/* */
/* <Description> */
/* Discards a given face object, as well as all of its child slots */
/* and sizes. */
/* */
/* <Input> */
/* face :: A handle to a target face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Face( FT_Face face )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_DriverInterface* interface;
FT_ListNode node;
if ( !face )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
interface = &driver->interface;
memory = driver->memory;
/* find face in driver's list */
node = FT_List_Find( &driver->faces_list, face );
if ( node )
{
/* remove face object from the driver's list */
FT_List_Remove( &driver->faces_list, node );
FREE( node );
/* now destroy the object proper */
destroy_face( memory, face, driver );
error = FT_Err_Ok;
}
else
error = FT_Err_Invalid_Face_Handle;
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Size */
/* */
/* <Description> */
/* Creates a new size object from a given face object. */
/* */
/* <Input> */
/* face :: A handle to a parent face object. */
/* */
/* <Output> */
/* asize :: A handle to a new size object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_Size( FT_Face face,
FT_Size* asize )
{
FT_Error error;
FT_Memory memory;
FT_Driver driver;
FT_DriverInterface* interface;
FT_Size size = 0;
FT_ListNode node = 0;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !asize )
return FT_Err_Invalid_Argument;
*asize = 0;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
interface = &driver->interface;
memory = face->memory;
/* Allocate new size object and perform basic initialisation */
if ( ALLOC( size, interface->size_object_size ) ||
ALLOC( node, sizeof ( FT_ListNodeRec ) ) )
goto Exit;
size->face = face;
error = interface->init_size( size );
/* in case of success, add to the face's list */
if ( !error )
{
*asize = size;
node->data = size;
FT_List_Add( &face->sizes_list, node );
/* record as current size for the face */
face->size = size;
}
Exit:
if ( error )
{
FREE( node );
FREE( size );
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Size */
/* */
/* <Description> */
/* Discards a given size object. */
/* */
/* <Input> */
/* size :: A handle to a target size object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_Size( FT_Size size )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_Face face;
FT_ListNode node;
if ( !size )
return FT_Err_Invalid_Size_Handle;
face = size->face;
if ( !face )
return FT_Err_Invalid_Face_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
memory = driver->memory;
error = FT_Err_Ok;
node = FT_List_Find( &face->sizes_list, size );
if ( node )
{
FT_List_Remove( &face->sizes_list, node );
FREE( node );
if ( face->size == size )
{
face->size = 0;
if ( face->sizes_list.head )
face->size = (FT_Size)(face->sizes_list.head->data);
}
destroy_size( memory, size, driver );
}
else
error = FT_Err_Invalid_Size_Handle;
return FT_Err_Ok;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The */
/* `char_width' and `char_height' values are used for the width and */
/* height, respectively, expressed in 26.6 fractional points. */
/* */
/* If the horizontal or vertical resolution values are zero, a */
/* default value of 72dpi is used. Similarly, if one of the */
/* character dimensions is zero, its value is set equal to the other. */
/* */
/* <InOut> */
/* size :: A handle to a target size object. */
/* */
/* <Input> */
/* char_width :: The character width, in 26.6 fractional points. */
/* */
/* char_height :: The character height, in 26.6 fractional */
/* points. */
/* */
/* horz_resolution :: The horizontal resolution. */
/* */
/* vert_resolution :: The vertical resolution. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* When dealing with fixed-size faces (i.e., non-scalable formats), */
/* use the function FT_Set_Pixel_Sizes(). */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Char_Size( FT_Face face,
FT_F26Dot6 char_width,
FT_F26Dot6 char_height,
FT_UInt horz_resolution,
FT_UInt vert_resolution )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_DriverInterface* interface;
FT_Size_Metrics* metrics;
FT_Long dim_x, dim_y;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !face->size )
return FT_Err_Invalid_Size_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
metrics = &face->size->metrics;
if ( !char_width )
char_width = char_height;
else if ( !char_height )
char_height = char_width;
if ( !horz_resolution )
horz_resolution = 72;
if ( !vert_resolution )
vert_resolution = 72;
driver = face->driver;
interface = &driver->interface;
memory = driver->memory;
/* default processing -- this can be overridden by the driver */
if ( char_width < 1 * 64 ) char_width = 1 * 64;
if ( char_height < 1 * 64 ) char_height = 1 * 64;
/* Compute pixel sizes in 26.6 units */
dim_x = ( ( ( char_width * horz_resolution ) / 72 ) + 32 ) & -64;
dim_y = ( ( ( char_height * vert_resolution ) / 72 ) + 32 ) & -64;
metrics->x_ppem = (FT_UShort)(dim_x >> 6);
metrics->y_ppem = (FT_UShort)(dim_y >> 6);
metrics->x_scale = 0x10000L;
metrics->y_scale = 0x10000L;
if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
{
metrics->x_scale = FT_DivFix( dim_x, face->units_per_EM );
metrics->y_scale = FT_DivFix( dim_y, face->units_per_EM );
}
error = interface->set_char_sizes( face->size,
char_width,
char_height,
horz_resolution,
vert_resolution );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Pixel_Sizes */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The width */
/* and height are expressed in integer pixels. */
/* */
/* If one of the character dimensions is zero, its value is set equal */
/* to the other. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* pixel_width :: The character width, in integer pixels. */
/* */
/* pixel_height :: The character height, in integer pixels. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height )
{
FT_Error error;
FT_Driver driver;
FT_Memory memory;
FT_DriverInterface* interface;
FT_Size_Metrics* metrics = &face->size->metrics;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !face->size )
return FT_Err_Invalid_Size_Handle;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
interface = &driver->interface;
memory = driver->memory;
/* default processing -- this can be overridden by the driver */
if ( pixel_width == 0 )
pixel_width = pixel_height;
else if ( pixel_height == 0 )
pixel_height = pixel_width;
if ( pixel_width < 1 ) pixel_width = 1;
if ( pixel_height < 1 ) pixel_height = 1;
metrics->x_ppem = pixel_width;
metrics->y_ppem = pixel_height;
if ( face->face_flags & FT_FACE_FLAG_SCALABLE )
{
metrics->x_scale = FT_DivFix( metrics->x_ppem << 6,
face->units_per_EM );
metrics->y_scale = FT_DivFix( metrics->y_ppem << 6,
face->units_per_EM );
}
error = interface->set_pixel_sizes( face->size,
pixel_width,
pixel_height );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_GlyphSlot */
/* */
/* <Description> */
/* It is sometimes useful to have more than one glyph slot for a */
/* given face object. This function is used to create additional */
/* slots. All of them are automatically discarded when the face is */
/* destroyed. */
/* */
/* <Input> */
/* face :: A handle to a parent face object. */
/* */
/* <Output> */
/* aslot :: A handle to a new glyph slot object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_New_GlyphSlot( FT_Face face,
FT_GlyphSlot* aslot )
{
FT_Error error;
FT_Driver driver;
FT_DriverInterface* interface;
FT_Memory memory;
FT_GlyphSlot slot;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !aslot )
return FT_Err_Invalid_Argument;
*aslot = 0;
driver = face->driver;
if ( !driver )
return FT_Err_Invalid_Driver_Handle;
interface = &driver->interface;
memory = driver->memory;
FT_TRACE4(( "FT_New_GlyphSlot: Creating new slot object\n" ));
if ( ALLOC( slot, interface->slot_object_size ) )
goto Exit;
slot->face = face;
slot->max_subglyphs = 0;
slot->num_subglyphs = 0;
slot->subglyphs = 0;
error = interface->init_glyph_slot( slot );
if ( !error )
{
/* in case of success, add slot to the face's list */
slot->next = face->glyph;
face->glyph = slot;
*aslot = slot;
}
if ( error )
FREE( slot );
Exit:
FT_TRACE4(( "FT_New_GlyphSlot: Return %d\n", error ));
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_GlyphSlot */
/* */
/* <Description> */
/* Destroys a given glyph slot. Remember however that all slots are */
/* automatically destroyed with its parent. Using this function is */
/* not always mandatory. */
/* */
/* <Input> */
/* slot :: A handle to a target glyph slot. */
/* */
FT_EXPORT_FUNC( void ) FT_Done_GlyphSlot( FT_GlyphSlot slot )
{
if ( slot )
{
FT_Driver driver = slot->face->driver;
FT_Memory memory = driver->memory;
FT_GlyphSlot* parent;
FT_GlyphSlot cur;
/* Remove slot from its parent face's list */
parent = &slot->face->glyph;
cur = *parent;
while ( cur )
{
if ( cur == slot )
{
*parent = cur->next;
break;
}
cur = cur->next;
}
driver->interface.done_glyph_slot( slot );
FREE( slot );
}
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Glyph */
/* */
/* <Description> */
/* A function used to load a single glyph within a given face. */
/* */
/* <Input> */
/* face :: A handle to a target face object where the glyph */
/* will be loaded. */
/* */
/* glyph_index :: The index of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int load_flags )
{
FT_Error error;
FT_Driver driver;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !face->size )
return FT_Err_Invalid_Size_Handle;
if ( !face->glyph )
return FT_Err_Invalid_Slot_Handle;
if ( glyph_index >= face->num_glyphs )
return FT_Err_Invalid_Argument;
driver = face->driver;
/* when the flag NO_RECURSE is set, we disable hinting and scaling */
if ( load_flags & FT_LOAD_NO_RECURSE )
load_flags |= FT_LOAD_NO_SCALE | FT_LOAD_NO_HINTING;
error = driver->interface.load_glyph( face->glyph,
face->size,
glyph_index,
load_flags );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Char */
/* */
/* <Description> */
/* A function used to load a single character within a given face */
/* and the selected charmap (to be done with the FT_Select_Charmap() */
/* function). */
/* */
/* <Input> */
/* face :: A handle to a target face object where the */
/* character will be loaded. */
/* */
/* char_code :: The character code of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Load_Char( FT_Face face,
FT_ULong char_code,
FT_Int load_flags )
{
FT_Error error;
FT_Driver driver;
FT_UInt glyph_index;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !face->size )
return FT_Err_Invalid_Size_Handle;
if ( !face->glyph )
return FT_Err_Invalid_Slot_Handle;
if ( !face->charmap )
return FT_Err_Invalid_CharMap_Handle;
driver = face->driver;
glyph_index = FT_Get_Char_Index( face, char_code );
if ( glyph_index == 0 )
error = FT_Err_Invalid_Character_Code;
else
error = driver->interface.load_glyph( face->glyph,
face->size,
glyph_index,
load_flags );
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Kerning */
/* */
/* <Description> */
/* Returns the kerning vector between two glyphs of a same face. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* left_glyph :: The index of the left glyph in the kern pair. */
/* */
/* right_glyph :: The index of the right glyph in the kern pair. */
/* */
/* <Output> */
/* kerning :: The kerning vector. This is in font units for */
/* scalable formats, and in pixels for fixed-sizes */
/* formats. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Only horizontal layouts (left-to-right & right-to-left) are */
/* supported by this method. Other layouts, or more sophisticated */
/* kernings, are out of the scope of this API function -- they can be */
/* implemented through format-specific interfaces. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Get_Kerning( FT_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_Vector* kerning )
{
FT_Error error = FT_Err_Ok;
FT_Driver driver;
FT_Memory memory;
if ( !face )
return FT_Err_Invalid_Face_Handle;
if ( !kerning )
return FT_Err_Invalid_Argument;
driver = face->driver;
memory = driver->memory;
if ( driver->interface.get_kerning )
{
error = driver->interface.get_kerning( face,
left_glyph,
right_glyph,
kerning );
}
else
{
kerning->x = 0;
kerning->y = 0;
}
return error;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Charmap */
/* */
/* <Description> */
/* Selects a given charmap by its encoding tag (as listed in */
/* `freetype.h'). */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* encoding :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error if no charmap in the face */
/* corresponds to the encoding queried here. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Select_Charmap( FT_Face face,
FT_Encoding encoding )
{
FT_CharMap* cur;
FT_CharMap* limit;
if ( !face )
return FT_Err_Invalid_Face_Handle;
cur = face->charmaps;
if ( !cur )
return FT_Err_Invalid_CharMap_Handle;
limit = cur + face->num_charmaps;
for ( ; cur < limit; cur++ )
{
if ( cur[0]->encoding == encoding )
{
face->charmap = cur[0];
return 0;
}
}
return FT_Err_Invalid_Argument;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Charmap */
/* */
/* <Description> */
/* Selects a given charmap for character code to glyph index */
/* decoding. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* charmap :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error when the charmap is not part */
/* of the face (i.e., if it is not listed in the face->charmaps[] */
/* table). */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Set_Charmap( FT_Face face,
FT_CharMap charmap )
{
FT_CharMap* cur;
FT_CharMap* limit;
if ( !face )
return FT_Err_Invalid_Face_Handle;
cur = face->charmaps;
if ( !cur )
return FT_Err_Invalid_CharMap_Handle;
limit = cur + face->num_charmaps;
for ( ; cur < limit; cur++ )
{
if ( cur[0] == charmap )
{
face->charmap = cur[0];
return 0;
}
}
return FT_Err_Invalid_Argument;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Char_Index */
/* */
/* <Description> */
/* Returns the glyph index of a given character code. This function */
/* uses a charmap object to do the translation. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* charcode :: The character code. */
/* */
/* <Return> */
/* The glyph index. 0 means `undefined character code'. */
/* */
FT_EXPORT_FUNC( FT_UInt ) FT_Get_Char_Index( FT_Face face,
FT_ULong charcode )
{
FT_UInt result;
FT_Driver driver;
result = 0;
if ( face && face->charmap )
{
driver = face->driver;
result = driver->interface.get_char_index( face->charmap, charcode );
}
return result;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Sfnt_Table */
/* */
/* <Description> */
/* Returns a pointer to a given SFNT table within a face. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* tag :: An index of an SFNT table. */
/* */
/* <Return> */
/* A type-less pointer to the table. This will be 0 in case of */
/* error, or if the corresponding table was not found *OR* loaded */
/* from the file. */
/* */
/* <Note> */
/* The table is owned by the face object, and disappears with it. */
/* */
/* This function is only useful to access SFNT tables that are loaded */
/* by the sfnt/truetype/opentype drivers. See the FT_Sfnt_Tag */
/* enumeration in `tttables.h' for a list. */
/* */
/* You can load any table with a different function.. XXX */
/* */
FT_EXPORT_FUNC( void* ) FT_Get_Sfnt_Table( FT_Face face,
FT_Sfnt_Tag tag )
{
void* table = 0;
FT_Get_Sfnt_Table_Func func;
FT_Driver driver;
if ( !face || !FT_IS_SFNT( face ) )
goto Exit;
driver = face->driver;
func = (FT_Get_Sfnt_Table_Func)driver->interface.get_interface(
driver, "get_sfnt" );
if ( func )
table = func( face, tag );
Exit:
return table;
}
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_FreeType */
/* */
/* <Description> */
/* Destroys a given FreeType library object and all of its childs, */
/* including resources, drivers, faces, sizes, etc. */
/* */
/* <Input> */
/* library :: A handle to the target library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_FUNC( FT_Error ) FT_Done_FreeType( FT_Library library )
{
/* test for valid `library' delayed to FT_Done_Library() */
/* Discard the library object */
FT_Done_Library( library );
return FT_Err_Ok;
}
/* END */