[SOLVED] CS代考计算机代写 interpreter /***************************************************************************/

/***************************************************************************/
/* */
/*ftincrem.h */
/* */
/*FreeType incremental loading (specification).*/
/* */
/*Copyright 2002-2015 by */
/*David Turner, Robert Wilhelm, and Werner Lemberg.*/
/* */
/*This file is part of the FreeType project, and may only be used, */
/*modified, and distributed under the terms of the FreeType project*/
/*license, LICENSE.TXT.By continuing to use, modify, or distribute */
/*this file you indicate that you have read the license and*/
/*understand and accept it fully.*/
/* */
/***************************************************************************/

#ifndef __FTINCREM_H__
#define __FTINCREM_H__

#include
#include FT_FREETYPE_H

#ifdef FREETYPE_H
#error “freetype.h of FreeType 1 has been loaded!”
#error “Please fix the directory search order for header files”
#error “so that freetype.h of FreeType 2 is found first.”
#endif

FT_BEGIN_HEADER

/***************************************************************************
*
* @section:
*incremental
*
* @title:
*Incremental Loading
*
* @abstract:
*Custom Glyph Loading.
*
* @description:
* This section contains various functions used to perform so-called
* `incremental’ glyph loading.This is a mode where all glyphs loaded
* from a given @FT_Face are provided by the client application.
*
* Apart from that, all other tables are loaded normally from the font
* file.This mode is useful when FreeType is used within another
* engine, e.g., a PostScript Imaging Processor.
*
* To enable this mode, you must use @FT_Open_Face, passing an
* @FT_Parameter with the @FT_PARAM_TAG_INCREMENTAL tag and an
* @FT_Incremental_Interface value.See the comments for
* @FT_Incremental_InterfaceRec for an example.
*
*/

/***************************************************************************
*
* @type:
* FT_Incremental
*
* @description:
* An opaque type describing a user-provided object used to implement
* `incremental’ glyph loading within FreeType.This is used to support
* embedded fonts in certain environments (e.g., PostScript interpreters),
* where the glyph data isn’t in the font file, or must be overridden by
* different values.
*
* @note:
* It is up to client applications to create and implement @FT_Incremental
* objects, as long as they provide implementations for the methods
* @FT_Incremental_GetGlyphDataFunc, @FT_Incremental_FreeGlyphDataFunc
* and @FT_Incremental_GetGlyphMetricsFunc.
*
* See the description of @FT_Incremental_InterfaceRec to understand how
* to use incremental objects with FreeType.
*
*/
typedef struct FT_IncrementalRec_*FT_Incremental;

/***************************************************************************
*
* @struct:
* FT_Incremental_MetricsRec
*
* @description:
* A small structure used to contain the basic glyph metrics returned
* by the @FT_Incremental_GetGlyphMetricsFunc method.
*
* @fields:
* bearing_x ::
* Left bearing, in font units.
*
* bearing_y ::
* Top bearing, in font units.
*
* advance ::
* Horizontal component of glyph advance, in font units.
*
* advance_v ::
* Vertical component of glyph advance, in font units.
*
* @note:
* These correspond to horizontal or vertical metrics depending on the
* value of the `vertical’ argument to the function
* @FT_Incremental_GetGlyphMetricsFunc.
*
*/
typedef structFT_Incremental_MetricsRec_
{
FT_Longbearing_x;
FT_Longbearing_y;
FT_Longadvance;
FT_Longadvance_v; /* since 2.3.12 */

} FT_Incremental_MetricsRec;

/***************************************************************************
*
* @struct:
* FT_Incremental_Metrics
*
* @description:
* A handle to an @FT_Incremental_MetricsRec structure.
*
*/
typedef struct FT_Incremental_MetricsRec_*FT_Incremental_Metrics;

/***************************************************************************
*
* @type:
* FT_Incremental_GetGlyphDataFunc
*
* @description:
* A function called by FreeType to access a given glyph’s data bytes
* during @FT_Load_Glyph or @FT_Load_Char if incremental loading is
* enabled.
*
* Note that the format of the glyph’s data bytes depends on the font
* file format.For TrueType, it must correspond to the raw bytes within
* the `glyf’ table.For PostScript formats, it must correspond to the
* *unencrypted* charstring bytes, without any `lenIV’ header.It is
* undefined for any other format.
*
* @input:
* incremental ::
* Handle to an opaque @FT_Incremental handle provided by the client
* application.
*
* glyph_index ::
* Index of relevant glyph.
*
* @output:
* adata ::
* A structure describing the returned glyph data bytes (which will be
* accessed as a read-only byte block).
*
* @return:
* FreeType error code.0~means success.
*
* @note:
* If this function returns successfully the method
* @FT_Incremental_FreeGlyphDataFunc will be called later to release
* the data bytes.
*
* Nested calls to @FT_Incremental_GetGlyphDataFunc can happen for
* compound glyphs.
*
*/
typedef FT_Error
(*FT_Incremental_GetGlyphDataFunc)( FT_Incrementalincremental,
FT_UInt glyph_index,
FT_Data*adata );

/***************************************************************************
*
* @type:
* FT_Incremental_FreeGlyphDataFunc
*
* @description:
* A function used to release the glyph data bytes returned by a
* successful call to @FT_Incremental_GetGlyphDataFunc.
*
* @input:
* incremental ::
* A handle to an opaque @FT_Incremental handle provided by the client
* application.
*
* data ::
* A structure describing the glyph data bytes (which will be accessed
* as a read-only byte block).
*
*/
typedef void
(*FT_Incremental_FreeGlyphDataFunc)( FT_Incrementalincremental,
FT_Data*data );

/***************************************************************************
*
* @type:
* FT_Incremental_GetGlyphMetricsFunc
*
* @description:
* A function used to retrieve the basic metrics of a given glyph index
* before accessing its data.This is necessary because, in certain
* formats like TrueType, the metrics are stored in a different place from
* the glyph images proper.
*
* @input:
* incremental ::
* A handle to an opaque @FT_Incremental handle provided by the client
* application.
*
* glyph_index ::
* Index of relevant glyph.
*
* vertical ::
* If true, return vertical metrics.
*
* ametrics ::
* This parameter is used for both input and output.
* The original glyph metrics, if any, in font units.If metrics are
* not available all the values must be set to zero.
*
* @output:
* ametrics ::
* The replacement glyph metrics in font units.
*
*/
typedef FT_Error
(*FT_Incremental_GetGlyphMetricsFunc)
( FT_Incrementalincremental,
FT_UInt glyph_index,
FT_Bool vertical,
FT_Incremental_MetricsRec*ametrics );

/**************************************************************************
*
* @struct:
* FT_Incremental_FuncsRec
*
* @description:
* A table of functions for accessing fonts that load data
* incrementally.Used in @FT_Incremental_InterfaceRec.
*
* @fields:
* get_glyph_data ::
* The function to get glyph data.Must not be null.
*
* free_glyph_data ::
* The function to release glyph data.Must not be null.
*
* get_glyph_metrics ::
* The function to get glyph metrics.May be null if the font does
* not provide overriding glyph metrics.
*
*/
typedef structFT_Incremental_FuncsRec_
{
FT_Incremental_GetGlyphDataFunc get_glyph_data;
FT_Incremental_FreeGlyphDataFuncfree_glyph_data;
FT_Incremental_GetGlyphMetricsFuncget_glyph_metrics;

} FT_Incremental_FuncsRec;

/***************************************************************************
*
* @struct:
* FT_Incremental_InterfaceRec
*
* @description:
* A structure to be used with @FT_Open_Face to indicate that the user
* wants to support incremental glyph loading.You should use it with
* @FT_PARAM_TAG_INCREMENTAL as in the following example:
*
* {
* FT_Incremental_InterfaceRecinc_int;
* FT_Parameter parameter;
* FT_Open_Args open_args;
*
*
* // set up incremental descriptor
* inc_int.funcs= my_funcs;
* inc_int.object = my_object;
*
* // set up optional parameter
* parameter.tag= FT_PARAM_TAG_INCREMENTAL;
* parameter.data = &inc_int;
*
* // set up FT_Open_Args structure
* open_args.flags= FT_OPEN_PATHNAME | FT_OPEN_PARAMS;
* open_args.pathname = my_font_pathname;
* open_args.num_params = 1;
* open_args.params = &parameter; // we use one optional argument
*
* // open the font
* error = FT_Open_Face( library, &open_args, index, &face );
* …
* }
*
*/
typedef structFT_Incremental_InterfaceRec_
{
const FT_Incremental_FuncsRec*funcs;
FT_Incrementalobject;

} FT_Incremental_InterfaceRec;

/***************************************************************************
*
* @type:
* FT_Incremental_Interface
*
* @description:
* A pointer to an @FT_Incremental_InterfaceRec structure.
*
*/
typedef FT_Incremental_InterfaceRec* FT_Incremental_Interface;

/***************************************************************************
*
* @constant:
* FT_PARAM_TAG_INCREMENTAL
*
* @description:
* A constant used as the tag of @FT_Parameter structures to indicate
* an incremental loading object to be used by FreeType.
*
*/
#define FT_PARAM_TAG_INCREMENTALFT_MAKE_TAG( ‘i’, ‘n’, ‘c’, ‘r’ )

/* */

FT_END_HEADER

#endif /* __FTINCREM_H__ */

/* END */