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freetype/src/base/ftobjs.h

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Initial revision
1999-12-17 00:11:37 +01:00
/***************************************************************************/
/* */
/* ftobjs.h */
/* */
/* The FreeType private base classes (specification). */
/* */
/* Copyright 1996-1999 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 file contains the definition of all internal FreeType classes. */
/* */
/*************************************************************************/
#ifndef FTOBJS_H
#define FTOBJS_H
#include <ftconfig.h>
#include <ftsystem.h>
#include <ftdriver.h>
/*************************************************************************/
/* */
/* Some generic definitions. */
/* */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL (void*)0
#endif
#ifndef UNUSED
#define UNUSED( arg ) ( (void)(arg) )
#endif
/*************************************************************************/
/* */
/* The min and max functions missing in C. As usual, be careful not to */
/* write things like MIN( a++, b++ ) to avoid side effects. */
/* */
#ifndef MIN
#define MIN( a, b ) ( (a) < (b) ? (a) : (b) )
#endif
#ifndef MAX
#define MAX( a, b ) ( (a) > (b) ? (a) : (b) )
#endif
#ifndef ABS
#define ABS( a ) ( (a) < 0 ? -(a) : (a) )
#endif
/*************************************************************************/
/* */
/* <Macro> */
/* FT_SET_ERROR */
/* */
/* <Description> */
/* This macro is used to set an implicit `error' variable to a given */
/* expression's value (usually a function call), and convert it to a */
/* boolean which is set whenever the value is != 0. */
/* */
#undef FT_SET_ERROR
#define FT_SET_ERROR( expression ) \
( (error = (expression)) != 0 )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** M E M O R Y ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <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' where allocation */
/* occurs. */
/* */
/* 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_DEF
FT_Error FT_Alloc( FT_Memory memory,
FT_Long size,
void** P );
/*************************************************************************/
/* */
/* <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' where allocation */
/* occurs. */
/* */
/* current :: 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. */
/* */
/* When the memory object's flag FT_memory_FLAG_NO_REALLOC is */
/* set, this function will try to emulate a realloc through uses */
/* of FT_Alloc and FT_Free. Otherwise, it will call the memory- */
/* specific "realloc" implementation. */
/* */
/* (Some embedded memorys do not have a working realloc). */
/* */
BASE_DEF
FT_Error FT_Realloc( FT_Memory memory,
FT_Long current,
FT_Long size,
void** P );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Free */
/* */
/* <Description> */
/* Releases a given block of memory allocated through FT_Alloc(). */
/* */
/* <Input> */
/* memory :: A handle to a given `memory object' where allocation */
/* occured. */
/* */
/* P :: This is the _address_ of a _pointer_ which points to the */
/* allocated block. It is always set to NULL on exit. */
/* */
/* <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_DEF
void FT_Free( FT_Memory memory,
void** P );
/* This include is needed by the MEM_xxx() macros, it should be */
/* available on every platform we know !! */
#include <string.h>
#define MEM_Set( dest, byte, count ) memset( dest, byte, count )
#ifdef HAVE_MEMCPY
#define MEM_Copy( dest, source, count ) memcpy( dest, source, count )
#else
#define MEM_Copy( dest, source, count ) bcopy( source, dest, count )
#endif
#define MEM_Move( dest, source, count ) memmove( dest, source, count )
/*************************************************************************/
/* */
/* We now support closures to produce completely reentrant code. This */
/* means the allocation functions now takes an additional argument */
/* (`memory'). It is a handle to a given memory object, responsible for */
/* all low-level operations, including memory management and */
/* synchronisation. */
/* */
/* In order to keep our code readable and use the same macros in the */
/* font drivers and the rest of the library, MEM_Alloc(), ALLOC(), and */
/* ALLOC_ARRAY() now use an implicit variable, `memory'. It must be */
/* defined at all locations where a memory operation is queried. */
/* */
/* */
/* Note that ALL memory allocation functions need an IMPLICIT argument */
/* called `memory' to point to the current memory object. */
/* */
#define MEM_Alloc( _pointer_, _size_ ) \
FT_Alloc( memory, _size_, (void**)&(_pointer_) )
#define MEM_Realloc( _pointer_, _current_, _size_ ) \
FT_Realloc( memory, _current_, _size_, (void**)&(_pointer_) )
#define ALLOC( _pointer_, _size_ ) \
FT_SET_ERROR( MEM_Alloc( _pointer_, _size_ ) )
#define REALLOC( _pointer_, _current_, _size_ ) \
FT_SET_ERROR( MEM_Realloc( _pointer_, _current_, _size_ ) )
#define ALLOC_ARRAY( _pointer_, _count_, _type_ ) \
FT_SET_ERROR( MEM_Alloc( _pointer_, (_count_)*sizeof (_type_) ) )
#define REALLOC_ARRAY( _pointer_, _current_, _count_, _type_ ) \
FT_SET_ERROR( MEM_Realloc( _pointer_, (_current_)*sizeof(_type_), \
(_count_)*sizeof(_type_) ) )
#define FREE( _pointer_ ) FT_Free( memory, (void**)&(_pointer_) )
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** D R I V E R S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* FT_DriverRec */
/* */
/* <Description> */
/* The root font driver class. A font driver is responsible for */
/* managing and loading font files of a given format. */
/* */
/* <Fields> */
/* library :: A handle to the driver's parent library. */
/* */
/* memory :: A handle to the driver's memory object. This is a */
/* duplicate of `library->memory'. */
/* */
/* interface :: A set of driver methods that implement its */
/* behaviour. These methods are called by the */
/* various FreeType functions like FT_New_Face(), */
/* FT_Load_Glyph(), etc. */
/* */
/* format :: A typeless pointer, used to store the address of */
/* the driver's format specific interface. This is a */
/* table of other driver methods that are specific to */
/* its format. Format specific interfaces are */
/* defined in the driver's header files (e.g., */
/* `freetype/drivers/ttlib/ttdriver.h'). */
/* */
/* version :: The driver's version. It can be used for */
/* versioning and dynamic driver update if needed. */
/* */
/* description :: An ASCII string describing the driver's supported */
/* format, like `truetype', `type1', etc. */
/* */
/* faces_list :: The list of faces currently opened by this driver. */
/* */
/* extensions :: a typeless pointer to the driver's extensions */
/* registry, when they are supported through the */
/* config macro FT_CONFIG_OPTION_EXTENSIONS */
/* */
typedef struct FT_DriverRec_
{
FT_Library library;
FT_Memory memory;
FT_Generic generic;
FT_DriverInterface interface;
FT_FormatInterface format;
FT_Int version; /* driver version */
FT_String* description; /* format description */
FT_ListRec faces_list; /* driver's faces list */
void* extensions;
} FT_DriverRec;
#ifdef FT_CONFIG_OPTION_ALTERNATE_GLYPH_FORMATS
added glyph zone objects
2000-02-21 17:00:36 +01:00
/************************************************************************
*
* <Struct>
* FT_GlyphZone
*
* <Description>
* A glyph zone is used to load, scale and hint glyph outline
* coordinates.
*
* <Fields>
* memory :: handle to memory manager
* max_points :: max size in points of zone
* max_contours :: max size in contours of zone
* n_points :: current number of points in zone
* n_contours :: current number of contours in zone
* org :: original glyph coordinates (font units/scaled)
* cur :: current glyph coordinates (scaled/hinted)
reformatting, changing the FT_Outline structure: - "flags" have been renamed to "tags" - "outline_flags" have been renamed to "flags" Look for more re-formatting today..
2000-03-09 12:46:25 +01:00
* tags :: point control tags
added glyph zone objects
2000-02-21 17:00:36 +01:00
* contours :: contour end points
*
***********************************************************************/
typedef struct FT_GlyphZone_
{
FT_Memory memory;
FT_UShort max_points;
FT_UShort max_contours;
FT_UShort n_points; /* number of points in zone */
FT_Short n_contours; /* number of contours */
FT_Vector* org; /* original point coordinates */
FT_Vector* cur; /* current point coordinates */
reformatting, changing the FT_Outline structure: - "flags" have been renamed to "tags" - "outline_flags" have been renamed to "flags" Look for more re-formatting today..
2000-03-09 12:46:25 +01:00
FT_Byte* tags; /* current touch flags */
added glyph zone objects
2000-02-21 17:00:36 +01:00
FT_UShort* contours; /* contour end points */
} FT_GlyphZone;
BASE_DEF
FT_Error FT_New_GlyphZone( FT_Memory memory,
FT_UShort maxPoints,
FT_Short maxContours,
FT_GlyphZone* zone );
BASE_DEF
void FT_Done_GlyphZone( FT_GlyphZone* zone );
BASE_DEF
FT_Error FT_Update_GlyphZone( FT_GlyphZone* zone,
FT_UShort num_points,
FT_Short num_contours );
Initial revision
1999-12-17 00:11:37 +01:00
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** G L Y P H F O R M A T S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************
*
* <Struct>
* FT_Glyph_Format
*
* <Description>
* A structure used to model various properties of a non-standard
* glyph image format.
*
* <Fields>
* format_tag :: the glyph format tag
*
* raster_interface :: the default rasters interface for this glyph
* format.
*
* raster :: the default raster object for this glyph format
* if set to nil, a new object will be allocated
* automatically through the raster interface.
*
* raster_owned :: a boolean used internally by the library. If
* set, if indicates that the current raster object
* was allocated by the library.
*
*************************************************************************/
typedef struct FT_Glyph_Format_
{
FT_Glyph_Tag format_tag;
FT_Raster_Interface* raster_interface;
FT_Raster raster;
FT_Bool raster_allocated;
} FT_Glyph_Format;
/*************************************************************************
*
* <Function>
* FT_Add_Glyph_Format
*
* <Description>
* Register a new glyph format into the library
*
* <Input>
* library :: handle to target library object
* interface :: pointer to glyph format interface
*
* <Return>
* Error code. 0 means success
*
* <Note>
* This function should normally be called by those font drivers which
* need to use their own glyph image format.
*
*************************************************************************/
EXPORT_DEF
FT_Error FT_Add_Glyph_Format( FT_Library library,
FT_Glyph_Format* format );
/*************************************************************************
*
* <Function>
* FT_Remove_Glyph_Format
*
* <Description>
* Un-Register a given glyph format from the library
*
* <Input>
* library :: handle to target library object
* glyph_format :: glyph format tag
*
* <Return>
* Error code. 0 means success
*
* <Note>
* This function should normally be called by those font drivers which
* need to use their own glyph image format.
*
*************************************************************************/
EXPORT_DEF
FT_Error FT_Remove_Glyph_Format( FT_Library library,
FT_Glyph_Tag glyph_format );
/*************************************************************************
*
* <Function>
* FT_Get_Glyph_Format
*
* <Description>
* Return a pointer to the glyph format descriptor corresponding to
* a given format tag.
*
* <Input>
* library :: handle to source library object
*
* format_tag :: glyph format tag
*
* <Return>
* a pointer to the corresponding glyph format descriptor, if it was
* registered in the library. 0 otherwise.
*
*************************************************************************/
BASE_DEF
FT_Glyph_Format* FT_Get_Glyph_Format( FT_Library library,
FT_Glyph_Tag format_tag );
#endif /* FT_CONFIG_OPTION_ALTERNATE_GLYPH_FORMATS */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/**** ****/
/**** ****/
/**** L I B R A R I E S ****/
/**** ****/
/**** ****/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
#define FT_DEBUG_HOOK_TRUETYPE 0
#define FT_DEBUG_HOOK_TYPE1 1
/*************************************************************************/
/* */
/* <Struct> */
/* FT_LibraryRec */
/* */
/* <Description> */
/* The FreeType library class. This is the root of all FreeType */
/* data. Use FT_New_Library() to create a library object, and */
/* FT_Done_Library() to discard it and all child objects. */
/* */
/* <Fields> */
/* memory :: The library's memory object. Manages memory */
/* allocation */
/* */
/* generic :: Client data variable. Used to extend the */
/* Library class by higher levels and clients. */
/* */
/* num_drivers :: The number of drivers currently registered */
/* within this library. This is set to 0 for new */
/* libraries. New drivers are added through the */
/* FT_Add_Driver() API function. */
/* */
/* drivers :: A table used to store handles to the currently */
/* registered font drivers. Note that each driver */
/* contains a list of its opened faces. */
/* */
/* glyph_formats :: A table used to store glyph format descriptors */
/* for new image formats that may have been */
/* registered within the library */
/* */
/* raster_pool :: The raster object's render pool. This can */
/* ideally be changed dynamically at run-time. */
/* */
typedef void (*FT_DebugHook_Func)( void* arg );
typedef struct FT_LibraryRec_
{
FT_Memory memory; /* library's memory object */
FT_Generic generic;
FT_Int num_drivers;
FT_Driver drivers[ FT_MAX_DRIVERS ]; /* driver objects */
FT_Glyph_Format glyph_formats[FT_MAX_GLYPH_FORMATS];
void* raster_pool; /* scan-line conversion render pool */
FT_DebugHook_Func debug_hooks[4];
} FT_LibraryRec;
/*************************************************************************/
/* */
/* <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> */
/* library :: A handle to a new library object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function is normally not called by client applications, */
/* unless they want to create a specific instance of FreeType which */
/* uses a specific memory allocator. */
/* */
EXPORT_DEF
FT_Error FT_New_Library( FT_Memory memory,
FT_Library* library );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Library */
/* */
/* <Description> */
/* Discards a given library object. This closes all drivers and */
/* discards all face objects. */
/* */
/* <Input> */
/* library :: A handle to the target library. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
EXPORT_DEF
FT_Error FT_Done_Library( FT_Library library );
EXPORT_DEF
void FT_Set_Debug_Hook( FT_Library library,
FT_UInt hook_index,
FT_DebugHook_Func debug_hook );
/*************************************************************************/
/* */
/* <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. */
/* */
/* <Input> */
/* library :: A handle to the target library object. */
/* */
/* driver_interface :: A pointer to a driver interface table. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function doesn't check whether the driver is already */
/* installed! */
/* */
EXPORT_DEF
FT_Error FT_Add_Driver( FT_Library library,
const FT_DriverInterface* driver_interface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Remove_Driver */
/* */
/* <Description> */
/* Unregister 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> */
/* Error code. 0 means success. */
/* */
EXPORT_DEF
FT_Error FT_Remove_Driver( FT_Driver driver );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Driver */
/* */
/* <Description> */
/* returns the handle of the driver responsible for a given format */
/* (or service) according to its `name'. */
/* */
/* <Input> */
/* library :: handle to library object. */
/* driver_name :: name of driver to look-up. */
/* */
/* <Return> */
/* handle to driver object. 0 otherwise */
/* */
EXPORT_DEF
FT_Driver FT_Get_Driver( FT_Library library,
char* driver_name );
#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
/**************************************************************************
*
* <Function>
* FT_New_Stream
*
* <Description>
* Open a new stream from a given standard ASCII file path name
*
* <Input>
* filepathname :: an ASCII string naming the file to be opened
*
* <Output>
* astream :: the opened stream descriptor to be used by the library
*
* <Return>
* Error code. 0 means success
*
* <Note>
* This function must be implemented by the system-specific part
* of the engine, i.e. `ftsystem.c'.
*
* This function should only fill the stream descriptor. Note that
* the stream's `memory' field should be left to the caller.
*
**************************************************************************/
extern
FT_Error FT_New_Stream( const char* filepathname,
FT_Stream astream );
/**************************************************************************
*
* <Function>
* FT_New_Memory
*
* <Description>
* Returns a handle to a new memory object
*
* <Return>
* Handle to the memory object. 0 means failure
*
* <Note>
* This function must be implemented by the system-specific part
* of the engine, i.e. `ftsystem.c'.
*
* It is only used by `ftinit' in order to implement the function
* FT_Init_FreeType.
*
**************************************************************************/
extern
FT_Memory FT_New_Memory( void );
#endif
/* Define default raster's interface. The default raster is located in `src/base/ftraster.c' */
/* */
/* Client applications can register new rasters through the FT_Set_Raster API.. */
/* */
#ifndef FT_NO_DEFAULT_RASTER
extern
FT_Raster_Interface ft_default_raster;
#endif
#endif /* FTOBJS_H */
/* END */
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