forked from minhngoc25a/freetype2
750 lines
37 KiB
C
750 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, 2002, 2003, 2004, 2005 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 <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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#include FT_INTERNAL_SERVICE_H
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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#include FT_INCREMENTAL_H
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#endif
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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 FT_MIN( a++, b++ ) to avoid side effects. */
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/* */
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#define FT_MIN( a, b ) ( (a) < (b) ? (a) : (b) )
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#define FT_MAX( a, b ) ( (a) > (b) ? (a) : (b) )
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#define FT_ABS( a ) ( (a) < 0 ? -(a) : (a) )
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#define FT_PAD_FLOOR( x, n ) ( (x) & ~((n)-1) )
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#define FT_PAD_ROUND( x, n ) FT_PAD_FLOOR( (x) + ((n)/2), n )
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#define FT_PAD_CEIL( x, n ) FT_PAD_FLOOR( (x) + ((n)-1), n )
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#define FT_PIX_FLOOR( x ) ( (x) & ~63 )
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#define FT_PIX_ROUND( x ) FT_PIX_FLOOR( (x) + 32 )
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#define FT_PIX_CEIL( x ) FT_PIX_FLOOR( (x) + 63 )
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/*
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* Return the highest power of 2 that is <= value; this correspond to
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* the highest bit in a given 32-bit value.
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*/
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FT_BASE( FT_UInt32 )
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ft_highpow2( FT_UInt32 value );
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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
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(*FT_CMap_InitFunc)( FT_CMap cmap,
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FT_Pointer init_data );
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typedef void
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(*FT_CMap_DoneFunc)( FT_CMap cmap );
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typedef FT_UInt
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(*FT_CMap_CharIndexFunc)( FT_CMap cmap,
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FT_UInt32 char_code );
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typedef FT_UInt
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(*FT_CMap_CharNextFunc)( FT_CMap cmap,
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FT_UInt32 *achar_code );
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typedef struct FT_CMap_ClassRec_
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{
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FT_ULong 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 and remove it from face's list */
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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 :: */
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/* The maximal number of points used to store the vectorial outline */
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/* of any glyph in this face. If this value cannot be known in */
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/* advance, or if the face isn't scalable, this should be set to 0. */
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/* Only relevant for scalable formats. */
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/* */
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/* max_contours :: */
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/* The maximal number of contours used to store the vectorial */
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/* outline of any glyph in this face. If this value cannot be */
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/* known in advance, or if the face isn't scalable, this should be */
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/* set to 0. Only relevant for scalable formats. */
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/* */
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/* transform_matrix :: */
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/* A 2x2 matrix of 16.16 coefficients used to transform glyph */
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/* outlines after they are loaded from the font. Only used by the */
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/* convenience functions. */
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/* */
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/* transform_delta :: */
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/* A translation vector used to transform glyph outlines after they */
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/* are loaded from the font. Only used by the convenience */
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/* functions. */
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/* */
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/* transform_flags :: */
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/* Some flags used to classify the transform. Only used by the */
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/* convenience functions. */
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/* */
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/* services :: */
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/* A cache for frequently used services. It should be only */
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/* accessed with the macro `FT_FACE_LOOKUP_SERVICE'. */
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/* */
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/* incremental_interface :: */
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/* If non-null, the interface through which glyph data and metrics */
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/* are loaded incrementally for faces that do not provide all of */
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/* this data when first opened. This field exists only if */
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/* @FT_CONFIG_OPTION_INCREMENTAL is defined. */
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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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FT_ServiceCacheRec services;
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#ifdef FT_CONFIG_OPTION_INCREMENTAL
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FT_Incremental_InterfaceRec* incremental_interface;
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#endif
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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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/* flags :: Possible values are zero or */
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/* FT_GLYPH_OWN_BITMAP. The latter indicates */
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/* that the FT_GlyphSlot structure owns the */
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/* bitmap buffer. */
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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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#define FT_GLYPH_OWN_BITMAP 0x1
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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_UInt flags;
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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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FT_BASE( FT_Pointer )
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ft_module_get_service( FT_Module module,
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const char* service_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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/**** ****/
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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_FACE_STREAM( x ) FT_FACE( x )->stream
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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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* Free the bitmap of a given glyphslot when needed
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* (i.e., only when it was allocated with ft_glyphslot_alloc_bitmap).
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*/
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FT_BASE( void )
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ft_glyphslot_free_bitmap( FT_GlyphSlot slot );
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/*
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* Allocate a new bitmap buffer in a glyph slot.
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*/
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FT_BASE( FT_Error )
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ft_glyphslot_alloc_bitmap( FT_GlyphSlot slot,
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FT_ULong size );
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/*
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* Set the bitmap buffer in a glyph slot to a given pointer.
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* The buffer will not be freed by a later call to ft_glyphslot_free_bitmap.
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*/
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FT_BASE( void )
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ft_glyphslot_set_bitmap( FT_GlyphSlot slot,
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FT_Byte* buffer );
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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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FT_Renderer_RenderFunc 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. */
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/* */
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/* <Fields> */
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/* root :: Contains the fields of the root module class. */
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/* */
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/* clazz :: A pointer to the font driver's class. Note that */
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/* this is NOT root.clazz. `class' wasn't used */
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/* as it is a reserved word in C++. */
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/* */
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/* faces_list :: The list of faces currently opened by this */
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/* driver. */
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/* */
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/* extensions :: A typeless pointer to the driver's extensions */
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/* 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 ****/
|
|
/**** ****/
|
|
/**** ****/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
/* this hook is used by the TrueType debugger. It must be set to an alternate
|
|
* truetype bytecode interpreter function
|
|
*/
|
|
#define FT_DEBUG_HOOK_TRUETYPE 0
|
|
|
|
|
|
/* set this debug hook to a non-null pointer to force unpatented hinting
|
|
* for all faces when both TT_CONFIG_OPTION_BYTECODE_INTERPRETER and
|
|
* TT_CONFIG_OPTION_UNPATENTED_HINTING are defined. this is only used
|
|
* during debugging
|
|
*/
|
|
#define FT_DEBUG_HOOK_UNPATENTED_HINTING 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. */
|
|
/* */
|
|
/* version_major :: The major version number of the library. */
|
|
/* */
|
|
/* version_minor :: The minor version number of the library. */
|
|
/* */
|
|
/* version_patch :: The current patch level of the library. */
|
|
/* */
|
|
/* 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_Render_Mode 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_BASE( FT_Memory )
|
|
FT_New_Memory( void );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Done_Memory */
|
|
/* */
|
|
/* <Description> */
|
|
/* Discards memory manager. */
|
|
/* */
|
|
/* <Input> */
|
|
/* memory :: A handle to the memory manager. */
|
|
/* */
|
|
FT_BASE( 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 */
|