755 lines
37 KiB
C
755 lines
37 KiB
C
/***************************************************************************/
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/* */
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/* ftobjs.h */
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/* */
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/* The FreeType private base classes (specification). */
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/* */
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/* Copyright 1996-2001 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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/*************************************************************************/
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/* */
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/* This file contains the definition of all internal FreeType classes. */
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/* */
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/*************************************************************************/
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#ifndef __FTOBJS_H__
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#define __FTOBJS_H__
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#include <setjmp.h>
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#include <ft2build.h>
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#include FT_RENDER_H
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#include FT_SIZES_H
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#include FT_INTERNAL_MEMORY_H
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#include FT_INTERNAL_GLYPH_LOADER_H
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#include FT_INTERNAL_DRIVER_H
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#include FT_INTERNAL_AUTOHINT_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/* */
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/* Some generic definitions. */
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/* */
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef NULL
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#define NULL (void*)0
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#endif
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/*************************************************************************/
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/* */
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/* The min and max functions missing in C. As usual, be careful not to */
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/* write things like MIN( a++, b++ ) to avoid side effects. */
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/* */
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#ifndef MIN
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#define MIN( a, b ) ( (a) < (b) ? (a) : (b) )
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#endif
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#ifndef MAX
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#define MAX( a, b ) ( (a) > (b) ? (a) : (b) )
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#endif
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#ifndef ABS
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#define ABS( a ) ( (a) < 0 ? -(a) : (a) )
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#endif
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** V A L I D A T I O N ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* handle to a validation object */
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typedef struct FT_ValidatorRec_* FT_Validator;
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/**************************************************************************
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*
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* there are three distinct validation levels defined here:
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*
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* FT_VALIDATE_DEFAULT ::
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* a table that passes this validation level can be used reliably by
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* FreeType. It generally means that all offsets have been checked to
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* prevent out-of-bound reads, array counts are correct, etc..
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*
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*
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* FT_VALIDATE_TIGHT ::
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* a table that passes this validation level can be used reliably and
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* doesn't contain invalid data. For example, a charmap table that
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* returns invalid glyph indices will not pass, even though it can
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* be used with FreeType in default mode (the library will simply
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* return an error later when trying to load the glyph)
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*
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* it also check that fields that must be a multiple of 2, 4 or 8 don't
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* have incorrect values, etc..
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*
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*
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* FT_VALIDATE_PARANOID ::
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* only for font facists. Checks that a table follows the specification
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* 100%. Very few fonts will be able to pass this level anyway but it
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* can be useful for certain tools like font editors/converters..
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*/
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typedef enum FT_ValidationLevel_
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{
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FT_VALIDATE_DEFAULT = 0,
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FT_VALIDATE_TIGHT,
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FT_VALIDATE_PARANOID
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} FT_ValidationLevel;
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/* validator structure */
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typedef struct FT_ValidatorRec_
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{
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FT_Byte* base; /* address of table in memory */
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FT_Byte* limit; /* 'base' + sizeof(table) in memory */
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FT_ValidationLevel level; /* validation level */
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FT_Error error; /* error returned. 0 means success */
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jmp_buf jump_buffer; /* used for exception handling */
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} FT_ValidatorRec;
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FT_BASE( void )
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ft_validator_init( FT_Validator valid,
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FT_Byte* base,
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FT_Byte* limit,
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FT_ValidationLevel level );
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/* sets the error field in a validator, then calls 'longjmp' to return */
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/* to high-level caller. Using 'setjmp/longjmp' avoids many stupid */
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/* error checks within the validation routines.. */
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/* */
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FT_BASE( void )
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ft_validator_error( FT_Validator valid,
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FT_Error error );
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/* calls ft_validate_error. Assumes that the 'valid' local variable holds */
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/* a pointer to the current validator object.. */
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/* */
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#define FT_INVALID(_error) ft_validator_error( valid, _error )
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/* called when a broken table is detected */
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#define FT_INVALID_TOO_SHORT FT_INVALID( FT_Err_Invalid_Format )
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/* called when an invalid offset is detected */
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#define FT_INVALID_OFFSET FT_INVALID( FT_Err_Invalid_Offset )
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/* called when an invalid format/value is detected */
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#define FT_INVALID_FORMAT FT_INVALID( FT_Err_Invalid_Format )
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/* called when an invalid glyph index is detected */
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#define FT_INVALID_GLYPH_ID FT_INVALID( FT_Err_Invalid_Glyph_Id )
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** C H A R M A P S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* handle to internal charmap object */
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typedef struct FT_CMapRec_* FT_CMap;
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/* handle to charmap class structure */
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typedef const struct FT_CMap_ClassRec_* FT_CMap_Class;
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/* internal charmap object structure */
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typedef struct FT_CMapRec_
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{
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FT_CharMapRec charmap;
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FT_CMap_Class clazz;
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} FT_CMapRec;
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/* typecase any pointer to a charmap handle */
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#define FT_CMAP(x) ((FT_CMap)(x))
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/* obvious macros */
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#define FT_CMAP_PLATFORM_ID(x) FT_CMAP(x)->charmap.platform_id
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#define FT_CMAP_ENCODING_ID(x) FT_CMAP(x)->charmap.encoding_id
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#define FT_CMAP_ENCODING(x) FT_CMAP(x)->charmap.encoding
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#define FT_CMAP_FACE(x) FT_CMAP(x)->charmap.face
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/* class method definitions */
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typedef FT_Error (*FT_CMap_InitFunc)( FT_CMap cmap,
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FT_Pointer init_data );
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typedef void (*FT_CMap_DoneFunc)( FT_CMap cmap );
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typedef FT_UInt (*FT_CMap_CharIndexFunc)( FT_CMap cmap,
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FT_UInt32 char_code );
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typedef FT_UInt32 (*FT_CMap_CharNextFunc)( FT_CMap cmap,
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FT_UInt32 char_code,
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FT_UInt *agindex );
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typedef struct FT_CMap_ClassRec_
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{
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FT_UInt size;
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FT_CMap_InitFunc init;
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FT_CMap_DoneFunc done;
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FT_CMap_CharIndexFunc char_index;
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FT_CMap_CharNextFunc char_next;
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} FT_CMap_ClassRec;
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/* create a new charmap and add it to charmap->face */
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FT_BASE( FT_Error )
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FT_CMap_New( FT_CMap_Class clazz,
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FT_Pointer init_data,
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FT_CharMap charmap,
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FT_CMap *acmap );
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/* destroy a charmap (don't remove it from face's list though) */
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FT_BASE( void )
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FT_CMap_Done( FT_CMap cmap );
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Face_InternalRec */
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/* */
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/* <Description> */
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/* This structure contains the internal fields of each FT_Face */
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/* object. These fields may change between different releases of */
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/* FreeType. */
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/* */
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/* <Fields> */
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/* max_points :: The maximal number of points used to store the */
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/* vectorial outline of any glyph in this face. */
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/* If this value cannot be known in advance, or */
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/* if the face isn't scalable, this should be set */
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/* to 0. Only relevant for scalable formats. */
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/* */
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/* max_contours :: The maximal number of contours used to store */
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/* the vectorial outline of any glyph in this */
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/* face. If this value cannot be known in */
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/* advance, or if the face isn't scalable, this */
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/* should be set to 0. Only relevant for */
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/* scalable formats. */
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/* */
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/* transform_matrix :: A 2x2 matrix of 16.16 coefficients used to */
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/* transform glyph outlines after they are loaded */
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/* from the font. Only used by the convenience */
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/* functions. */
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/* */
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/* transform_delta :: A translation vector used to transform glyph */
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/* outlines after they are loaded from the font. */
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/* Only used by the convenience functions. */
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/* */
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/* transform_flags :: Some flags used to classify the transform. */
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/* Only used by the convenience functions. */
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/* */
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/* postscript_name :: Postscript font name for this face. */
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/* */
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typedef struct FT_Face_InternalRec_
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{
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FT_UShort max_points;
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FT_Short max_contours;
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FT_Matrix transform_matrix;
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FT_Vector transform_delta;
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FT_Int transform_flags;
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const char* postscript_name;
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} FT_Face_InternalRec;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Slot_InternalRec */
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/* */
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/* <Description> */
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/* This structure contains the internal fields of each FT_GlyphSlot */
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/* object. These fields may change between different releases of */
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/* FreeType. */
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/* */
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/* <Fields> */
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/* loader :: The glyph loader object used to load outlines */
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/* into the glyph slot. */
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/* */
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/* glyph_transformed :: Boolean. Set to TRUE when the loaded glyph */
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/* must be transformed through a specific */
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/* font transformation. This is _not_ the same */
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/* as the face transform set through */
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/* FT_Set_Transform(). */
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/* */
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/* glyph_matrix :: The 2x2 matrix corresponding to the glyph */
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/* transformation, if necessary. */
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/* */
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/* glyph_delta :: The 2d translation vector corresponding to */
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/* the glyph transformation, if necessary. */
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/* */
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/* glyph_hints :: Format-specific glyph hints management. */
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/* */
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typedef struct FT_Slot_InternalRec_
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{
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FT_GlyphLoader loader;
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FT_Bool glyph_transformed;
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FT_Matrix glyph_matrix;
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FT_Vector glyph_delta;
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void* glyph_hints;
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} FT_GlyphSlot_InternalRec;
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** M O D U L E S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_ModuleRec */
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/* */
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/* <Description> */
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/* A module object instance. */
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/* */
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/* <Fields> */
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/* clazz :: A pointer to the module's class. */
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/* */
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/* library :: A handle to the parent library object. */
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/* */
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/* memory :: A handle to the memory manager. */
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/* */
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/* generic :: A generic structure for user-level extensibility (?). */
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/* */
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typedef struct FT_ModuleRec_
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{
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FT_Module_Class* clazz;
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FT_Library library;
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FT_Memory memory;
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FT_Generic generic;
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} FT_ModuleRec;
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/* typecast an object to a FT_Module */
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#define FT_MODULE( x ) ((FT_Module)(x))
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#define FT_MODULE_CLASS( x ) FT_MODULE(x)->clazz
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#define FT_MODULE_LIBRARY( x ) FT_MODULE(x)->library
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#define FT_MODULE_MEMORY( x ) FT_MODULE(x)->memory
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#define FT_MODULE_IS_DRIVER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
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ft_module_font_driver )
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#define FT_MODULE_IS_RENDERER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
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ft_module_renderer )
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#define FT_MODULE_IS_HINTER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
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ft_module_hinter )
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#define FT_MODULE_IS_STYLER( x ) ( FT_MODULE_CLASS( x )->module_flags & \
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ft_module_styler )
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#define FT_DRIVER_IS_SCALABLE( x ) ( FT_MODULE_CLASS(x)->module_flags & \
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ft_module_driver_scalable )
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#define FT_DRIVER_USES_OUTLINES( x ) !( FT_MODULE_CLASS(x)->module_flags & \
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ft_module_driver_no_outlines )
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#define FT_DRIVER_HAS_HINTER( x ) ( FT_MODULE_CLASS(x)->module_flags & \
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ft_module_driver_has_hinter )
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Get_Module_Interface */
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/* */
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/* <Description> */
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/* Finds a module and returns its specific interface as a typeless */
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/* pointer. */
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/* */
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/* <Input> */
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/* library :: A handle to the library object. */
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/* */
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/* module_name :: The module's name (as an ASCII string). */
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/* */
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/* <Return> */
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/* A module-specific interface if available, 0 otherwise. */
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/* */
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/* <Note> */
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/* You should better be familiar with FreeType internals to know */
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/* which module to look for, and what its interface is :-) */
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/* */
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FT_BASE( const void* )
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FT_Get_Module_Interface( FT_Library library,
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const char* mod_name );
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** FACE, SIZE & GLYPH SLOT OBJECTS ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* a few macros used to perform easy typecasts with minimal brain damage */
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#define FT_FACE( x ) ((FT_Face)(x))
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#define FT_SIZE( x ) ((FT_Size)(x))
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#define FT_SLOT( x ) ((FT_GlyphSlot)(x))
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#define FT_FACE_DRIVER( x ) FT_FACE( x )->driver
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#define FT_FACE_LIBRARY( x ) FT_FACE_DRIVER( x )->root.library
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#define FT_FACE_MEMORY( x ) FT_FACE( x )->memory
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#define FT_SIZE_FACE( x ) FT_SIZE( x )->face
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#define FT_SLOT_FACE( x ) FT_SLOT( x )->face
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#define FT_FACE_SLOT( x ) FT_FACE( x )->glyph
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#define FT_FACE_SIZE( x ) FT_FACE( x )->size
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_New_GlyphSlot */
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/* */
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/* <Description> */
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/* It is sometimes useful to have more than one glyph slot for a */
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/* given face object. This function is used to create additional */
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/* slots. All of them are automatically discarded when the face is */
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/* destroyed. */
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/* */
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/* <Input> */
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/* face :: A handle to a parent face object. */
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/* */
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/* <Output> */
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/* aslot :: A handle to a new glyph slot object. */
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/* */
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/* <Return> */
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/* FreeType error code. 0 means success. */
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/* */
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FT_BASE( FT_Error )
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FT_New_GlyphSlot( FT_Face face,
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FT_GlyphSlot *aslot );
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/*************************************************************************/
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/* */
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/* <Function> */
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/* FT_Done_GlyphSlot */
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/* */
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/* <Description> */
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/* Destroys a given glyph slot. Remember however that all slots are */
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/* automatically destroyed with its parent. Using this function is */
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/* not always mandatory. */
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/* */
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/* <Input> */
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/* slot :: A handle to a target glyph slot. */
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/* */
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FT_BASE( void )
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FT_Done_GlyphSlot( FT_GlyphSlot slot );
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** R E N D E R E R S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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#define FT_RENDERER( x ) ((FT_Renderer)( x ))
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#define FT_GLYPH( x ) ((FT_Glyph)( x ))
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#define FT_BITMAP_GLYPH( x ) ((FT_BitmapGlyph)( x ))
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#define FT_OUTLINE_GLYPH( x ) ((FT_OutlineGlyph)( x ))
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typedef struct FT_RendererRec_
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{
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FT_ModuleRec root;
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FT_Renderer_Class* clazz;
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FT_Glyph_Format glyph_format;
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FT_Glyph_Class glyph_class;
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FT_Raster raster;
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FT_Raster_Render_Func raster_render;
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FTRenderer_render render;
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} FT_RendererRec;
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/**** ****/
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/**** ****/
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/**** F O N T D R I V E R S ****/
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/**** ****/
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/**** ****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* typecast a module into a driver easily */
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#define FT_DRIVER( x ) ((FT_Driver)(x))
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/* typecast a module as a driver, and get its driver class */
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#define FT_DRIVER_CLASS( x ) FT_DRIVER( x )->clazz
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_DriverRec */
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/* */
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/* <Description> */
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/* The root font driver class. A font driver is responsible for */
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/* managing and loading font files of a given format. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* root :: Contains the fields of the root module class. */
|
|
/* */
|
|
/* clazz :: A pointer to the font driver's class. Note that */
|
|
/* this is NOT root.clazz. `class' wasn't used */
|
|
/* as it is a reserved word in C++. */
|
|
/* */
|
|
/* faces_list :: The list of faces currently opened by this */
|
|
/* driver. */
|
|
/* */
|
|
/* extensions :: A typeless pointer to the driver's extensions */
|
|
/* registry, if they are supported through the */
|
|
/* configuration macro FT_CONFIG_OPTION_EXTENSIONS. */
|
|
/* */
|
|
/* glyph_loader :: The glyph loader for all faces managed by this */
|
|
/* driver. This object isn't defined for unscalable */
|
|
/* formats. */
|
|
/* */
|
|
typedef struct FT_DriverRec_
|
|
{
|
|
FT_ModuleRec root;
|
|
FT_Driver_Class clazz;
|
|
|
|
FT_ListRec faces_list;
|
|
void* extensions;
|
|
|
|
FT_GlyphLoader glyph_loader;
|
|
|
|
} FT_DriverRec;
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/**** ****/
|
|
/**** ****/
|
|
/**** 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_modules :: The number of modules currently registered */
|
|
/* within this library. This is set to 0 for new */
|
|
/* libraries. New modules are added through the */
|
|
/* FT_Add_Module() API function. */
|
|
/* */
|
|
/* modules :: A table used to store handles to the currently */
|
|
/* registered modules. Note that each font driver */
|
|
/* contains a list of its opened faces. */
|
|
/* */
|
|
/* renderers :: The list of renderers currently registered */
|
|
/* within the library. */
|
|
/* */
|
|
/* cur_renderer :: The current outline renderer. This is a */
|
|
/* shortcut used to avoid parsing the list on */
|
|
/* each call to FT_Outline_Render(). It is a */
|
|
/* handle to the current renderer for the */
|
|
/* ft_glyph_format_outline format. */
|
|
/* */
|
|
/* auto_hinter :: XXX */
|
|
/* */
|
|
/* raster_pool :: The raster object's render pool. This can */
|
|
/* ideally be changed dynamically at run-time. */
|
|
/* */
|
|
/* raster_pool_size :: The size of the render pool in bytes. */
|
|
/* */
|
|
/* debug_hooks :: XXX */
|
|
/* */
|
|
typedef struct FT_LibraryRec_
|
|
{
|
|
FT_Memory memory; /* library's memory manager */
|
|
|
|
FT_Generic generic;
|
|
|
|
FT_Int version_major;
|
|
FT_Int version_minor;
|
|
FT_Int version_patch;
|
|
|
|
FT_UInt num_modules;
|
|
FT_Module modules[FT_MAX_MODULES]; /* module objects */
|
|
|
|
FT_ListRec renderers; /* list of renderers */
|
|
FT_Renderer cur_renderer; /* current outline renderer */
|
|
FT_Module auto_hinter;
|
|
|
|
FT_Byte* raster_pool; /* scan-line conversion */
|
|
/* render pool */
|
|
FT_ULong raster_pool_size; /* size of render pool in bytes */
|
|
|
|
FT_DebugHook_Func debug_hooks[4];
|
|
|
|
} FT_LibraryRec;
|
|
|
|
|
|
FT_BASE( FT_Renderer )
|
|
FT_Lookup_Renderer( FT_Library library,
|
|
FT_Glyph_Format format,
|
|
FT_ListNode* node );
|
|
|
|
FT_BASE( FT_Error )
|
|
FT_Render_Glyph_Internal( FT_Library library,
|
|
FT_GlyphSlot slot,
|
|
FT_UInt render_mode );
|
|
|
|
typedef const char*
|
|
(*FT_Face_GetPostscriptNameFunc)( FT_Face face );
|
|
|
|
typedef FT_Error
|
|
(*FT_Face_GetGlyphNameFunc)( FT_Face face,
|
|
FT_UInt glyph_index,
|
|
FT_Pointer buffer,
|
|
FT_UInt buffer_max );
|
|
|
|
typedef FT_UInt
|
|
(*FT_Face_GetGlyphNameIndexFunc)( FT_Face face,
|
|
FT_String* glyph_name );
|
|
|
|
|
|
#ifndef FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_New_Memory */
|
|
/* */
|
|
/* <Description> */
|
|
/* Creates a new memory object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* A pointer to the new memory object. 0 in case of error. */
|
|
/* */
|
|
FT_EXPORT( FT_Memory )
|
|
FT_New_Memory( void );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Done_Memory */
|
|
/* */
|
|
/* <Description> */
|
|
/* Discards memory manager. */
|
|
/* */
|
|
/* <Input> */
|
|
/* memory :: A handle to the memory manager. */
|
|
/* */
|
|
FT_EXPORT( void )
|
|
FT_Done_Memory( FT_Memory memory );
|
|
|
|
#endif /* !FT_CONFIG_OPTION_NO_DEFAULT_SYSTEM */
|
|
|
|
|
|
/* 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
|
|
FT_EXPORT_VAR( FT_Raster_Funcs ) ft_default_raster;
|
|
#endif
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __FTOBJS_H__ */
|
|
|
|
|
|
/* END */
|