723 lines
22 KiB
C
723 lines
22 KiB
C
/***************************************************************************/
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/* */
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/* pshints.h */
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/* */
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/* Interface to Postscript-specific (Type 1 and Type 2) hints */
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/* recorders (specification only). These are used to support native */
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/* T1/T2 hints in the `type1', `cid', and `cff' font drivers. */
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/* */
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/* Copyright 2001-2015 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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#ifndef __PSHINTS_H__
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#define __PSHINTS_H__
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_TYPE1_TABLES_H
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FT_BEGIN_HEADER
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** INTERNAL REPRESENTATION OF GLOBALS *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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typedef struct PSH_GlobalsRec_* PSH_Globals;
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typedef FT_Error
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(*PSH_Globals_NewFunc)( FT_Memory memory,
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T1_Private* private_dict,
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PSH_Globals* aglobals );
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typedef void
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(*PSH_Globals_SetScaleFunc)( PSH_Globals globals,
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FT_Fixed x_scale,
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FT_Fixed y_scale,
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FT_Fixed x_delta,
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FT_Fixed y_delta );
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typedef void
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(*PSH_Globals_DestroyFunc)( PSH_Globals globals );
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typedef struct PSH_Globals_FuncsRec_
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{
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PSH_Globals_NewFunc create;
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PSH_Globals_SetScaleFunc set_scale;
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PSH_Globals_DestroyFunc destroy;
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} PSH_Globals_FuncsRec, *PSH_Globals_Funcs;
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** PUBLIC TYPE 1 HINTS RECORDER *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************
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*
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* @type:
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* T1_Hints
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*
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* @description:
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* This is a handle to an opaque structure used to record glyph hints
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* from a Type 1 character glyph character string.
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*
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* The methods used to operate on this object are defined by the
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* @T1_Hints_FuncsRec structure. Recording glyph hints is normally
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* achieved through the following scheme:
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*
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* - Open a new hint recording session by calling the `open' method.
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* This rewinds the recorder and prepare it for new input.
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*
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* - For each hint found in the glyph charstring, call the corresponding
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* method (`stem', `stem3', or `reset'). Note that these functions do
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* not return an error code.
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*
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* - Close the recording session by calling the `close' method. It
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* returns an error code if the hints were invalid or something
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* strange happened (e.g., memory shortage).
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*
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* The hints accumulated in the object can later be used by the
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* PostScript hinter.
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*
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*/
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typedef struct T1_HintsRec_* T1_Hints;
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/*************************************************************************
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*
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* @type:
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* T1_Hints_Funcs
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*
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* @description:
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* A pointer to the @T1_Hints_FuncsRec structure that defines the API of
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* a given @T1_Hints object.
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*
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*/
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typedef const struct T1_Hints_FuncsRec_* T1_Hints_Funcs;
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_OpenFunc
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*
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* @description:
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* A method of the @T1_Hints class used to prepare it for a new Type 1
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* hints recording session.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* @note:
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* You should always call the @T1_Hints_CloseFunc method in order to
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* close an opened recording session.
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*
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*/
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typedef void
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(*T1_Hints_OpenFunc)( T1_Hints hints );
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_SetStemFunc
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*
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* @description:
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* A method of the @T1_Hints class used to record a new horizontal or
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* vertical stem. This corresponds to the Type 1 `hstem' and `vstem'
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* operators.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* dimension ::
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* 0 for horizontal stems (hstem), 1 for vertical ones (vstem).
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*
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* coords ::
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* Array of 2 coordinates in 16.16 format, used as (position,length)
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* stem descriptor.
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*
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* @note:
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* Use vertical coordinates (y) for horizontal stems (dim=0). Use
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* horizontal coordinates (x) for vertical stems (dim=1).
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*
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* `coords[0]' is the absolute stem position (lowest coordinate);
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* `coords[1]' is the length.
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*
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* The length can be negative, in which case it must be either -20 or
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* -21. It is interpreted as a `ghost' stem, according to the Type 1
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* specification.
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*
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* If the length is -21 (corresponding to a bottom ghost stem), then
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* the real stem position is `coords[0]+coords[1]'.
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*
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*/
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typedef void
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(*T1_Hints_SetStemFunc)( T1_Hints hints,
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FT_UInt dimension,
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FT_Fixed* coords );
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_SetStem3Func
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*
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* @description:
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* A method of the @T1_Hints class used to record three
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* counter-controlled horizontal or vertical stems at once.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* dimension ::
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* 0 for horizontal stems, 1 for vertical ones.
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*
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* coords ::
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* An array of 6 values in 16.16 format, holding 3 (position,length)
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* pairs for the counter-controlled stems.
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*
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* @note:
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* Use vertical coordinates (y) for horizontal stems (dim=0). Use
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* horizontal coordinates (x) for vertical stems (dim=1).
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*
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* The lengths cannot be negative (ghost stems are never
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* counter-controlled).
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*
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*/
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typedef void
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(*T1_Hints_SetStem3Func)( T1_Hints hints,
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FT_UInt dimension,
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FT_Fixed* coords );
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_ResetFunc
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*
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* @description:
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* A method of the @T1_Hints class used to reset the stems hints in a
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* recording session.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* end_point ::
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* The index of the last point in the input glyph in which the
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* previously defined hints apply.
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*
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*/
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typedef void
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(*T1_Hints_ResetFunc)( T1_Hints hints,
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FT_UInt end_point );
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_CloseFunc
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*
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* @description:
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* A method of the @T1_Hints class used to close a hint recording
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* session.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* end_point ::
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* The index of the last point in the input glyph.
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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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* @note:
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* The error code is set to indicate that an error occurred during the
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* recording session.
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*
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*/
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typedef FT_Error
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(*T1_Hints_CloseFunc)( T1_Hints hints,
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FT_UInt end_point );
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/*************************************************************************
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*
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* @functype:
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* T1_Hints_ApplyFunc
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*
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* @description:
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* A method of the @T1_Hints class used to apply hints to the
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* corresponding glyph outline. Must be called once all hints have been
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* recorded.
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*
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* @input:
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* hints ::
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* A handle to the Type 1 hints recorder.
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*
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* outline ::
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* A pointer to the target outline descriptor.
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*
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* globals ::
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* The hinter globals for this font.
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*
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* hint_mode ::
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* Hinting information.
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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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* @note:
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* On input, all points within the outline are in font coordinates. On
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* output, they are in 1/64th of pixels.
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*
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* The scaling transformation is taken from the `globals' object which
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* must correspond to the same font as the glyph.
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*
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*/
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typedef FT_Error
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(*T1_Hints_ApplyFunc)( T1_Hints hints,
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FT_Outline* outline,
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PSH_Globals globals,
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FT_Render_Mode hint_mode );
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/*************************************************************************
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*
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* @struct:
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* T1_Hints_FuncsRec
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*
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* @description:
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* The structure used to provide the API to @T1_Hints objects.
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*
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* @fields:
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* hints ::
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* A handle to the T1 Hints recorder.
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*
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* open ::
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* The function to open a recording session.
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*
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* close ::
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* The function to close a recording session.
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*
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* stem ::
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* The function to set a simple stem.
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*
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* stem3 ::
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* The function to set counter-controlled stems.
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*
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* reset ::
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* The function to reset stem hints.
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*
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* apply ::
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* The function to apply the hints to the corresponding glyph outline.
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*
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*/
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typedef struct T1_Hints_FuncsRec_
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{
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T1_Hints hints;
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T1_Hints_OpenFunc open;
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T1_Hints_CloseFunc close;
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T1_Hints_SetStemFunc stem;
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T1_Hints_SetStem3Func stem3;
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T1_Hints_ResetFunc reset;
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T1_Hints_ApplyFunc apply;
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} T1_Hints_FuncsRec;
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/*************************************************************************/
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/*************************************************************************/
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/***** *****/
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/***** PUBLIC TYPE 2 HINTS RECORDER *****/
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/***** *****/
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************
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*
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* @type:
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* T2_Hints
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*
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* @description:
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* This is a handle to an opaque structure used to record glyph hints
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* from a Type 2 character glyph character string.
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*
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* The methods used to operate on this object are defined by the
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* @T2_Hints_FuncsRec structure. Recording glyph hints is normally
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* achieved through the following scheme:
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*
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* - Open a new hint recording session by calling the `open' method.
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* This rewinds the recorder and prepare it for new input.
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*
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* - For each hint found in the glyph charstring, call the corresponding
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* method (`stems', `hintmask', `counters'). Note that these
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* functions do not return an error code.
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*
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* - Close the recording session by calling the `close' method. It
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* returns an error code if the hints were invalid or something
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* strange happened (e.g., memory shortage).
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*
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* The hints accumulated in the object can later be used by the
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* Postscript hinter.
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*
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*/
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typedef struct T2_HintsRec_* T2_Hints;
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/*************************************************************************
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*
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* @type:
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* T2_Hints_Funcs
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*
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* @description:
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* A pointer to the @T2_Hints_FuncsRec structure that defines the API of
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* a given @T2_Hints object.
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*
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*/
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typedef const struct T2_Hints_FuncsRec_* T2_Hints_Funcs;
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/*************************************************************************
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*
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* @functype:
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* T2_Hints_OpenFunc
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*
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* @description:
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* A method of the @T2_Hints class used to prepare it for a new Type 2
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* hints recording session.
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*
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* @input:
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* hints ::
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* A handle to the Type 2 hints recorder.
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*
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* @note:
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* You should always call the @T2_Hints_CloseFunc method in order to
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* close an opened recording session.
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*
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*/
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typedef void
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(*T2_Hints_OpenFunc)( T2_Hints hints );
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|
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/*************************************************************************
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*
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* @functype:
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* T2_Hints_StemsFunc
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*
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* @description:
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* A method of the @T2_Hints class used to set the table of stems in
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* either the vertical or horizontal dimension. Equivalent to the
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* `hstem', `vstem', `hstemhm', and `vstemhm' Type 2 operators.
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*
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* @input:
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* hints ::
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* A handle to the Type 2 hints recorder.
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|
*
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* dimension ::
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* 0 for horizontal stems (hstem), 1 for vertical ones (vstem).
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*
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* count ::
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* The number of stems.
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*
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* coords ::
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* An array of `count' (position,length) pairs in 16.16 format.
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*
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* @note:
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* Use vertical coordinates (y) for horizontal stems (dim=0). Use
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* horizontal coordinates (x) for vertical stems (dim=1).
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|
*
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* There are `2*count' elements in the `coords' array. Each even
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* element is an absolute position in font units, each odd element is a
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* length in font units.
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|
*
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|
* A length can be negative, in which case it must be either -20 or
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* -21. It is interpreted as a `ghost' stem, according to the Type 1
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* specification.
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*
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*/
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typedef void
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(*T2_Hints_StemsFunc)( T2_Hints hints,
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FT_UInt dimension,
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FT_Int count,
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FT_Fixed* coordinates );
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|
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/*************************************************************************
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*
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* @functype:
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|
* T2_Hints_MaskFunc
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|
*
|
|
* @description:
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|
* A method of the @T2_Hints class used to set a given hintmask (this
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|
* corresponds to the `hintmask' Type 2 operator).
|
|
*
|
|
* @input:
|
|
* hints ::
|
|
* A handle to the Type 2 hints recorder.
|
|
*
|
|
* end_point ::
|
|
* The glyph index of the last point to which the previously defined
|
|
* or activated hints apply.
|
|
*
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|
* bit_count ::
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|
* The number of bits in the hint mask.
|
|
*
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|
* bytes ::
|
|
* An array of bytes modelling the hint mask.
|
|
*
|
|
* @note:
|
|
* If the hintmask starts the charstring (before any glyph point
|
|
* definition), the value of `end_point' should be 0.
|
|
*
|
|
* `bit_count' is the number of meaningful bits in the `bytes' array; it
|
|
* must be equal to the total number of hints defined so far (i.e.,
|
|
* horizontal+verticals).
|
|
*
|
|
* The `bytes' array can come directly from the Type 2 charstring and
|
|
* respects the same format.
|
|
*
|
|
*/
|
|
typedef void
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|
(*T2_Hints_MaskFunc)( T2_Hints hints,
|
|
FT_UInt end_point,
|
|
FT_UInt bit_count,
|
|
const FT_Byte* bytes );
|
|
|
|
|
|
/*************************************************************************
|
|
*
|
|
* @functype:
|
|
* T2_Hints_CounterFunc
|
|
*
|
|
* @description:
|
|
* A method of the @T2_Hints class used to set a given counter mask
|
|
* (this corresponds to the `hintmask' Type 2 operator).
|
|
*
|
|
* @input:
|
|
* hints ::
|
|
* A handle to the Type 2 hints recorder.
|
|
*
|
|
* end_point ::
|
|
* A glyph index of the last point to which the previously defined or
|
|
* active hints apply.
|
|
*
|
|
* bit_count ::
|
|
* The number of bits in the hint mask.
|
|
*
|
|
* bytes ::
|
|
* An array of bytes modelling the hint mask.
|
|
*
|
|
* @note:
|
|
* If the hintmask starts the charstring (before any glyph point
|
|
* definition), the value of `end_point' should be 0.
|
|
*
|
|
* `bit_count' is the number of meaningful bits in the `bytes' array; it
|
|
* must be equal to the total number of hints defined so far (i.e.,
|
|
* horizontal+verticals).
|
|
*
|
|
* The `bytes' array can come directly from the Type 2 charstring and
|
|
* respects the same format.
|
|
*
|
|
*/
|
|
typedef void
|
|
(*T2_Hints_CounterFunc)( T2_Hints hints,
|
|
FT_UInt bit_count,
|
|
const FT_Byte* bytes );
|
|
|
|
|
|
/*************************************************************************
|
|
*
|
|
* @functype:
|
|
* T2_Hints_CloseFunc
|
|
*
|
|
* @description:
|
|
* A method of the @T2_Hints class used to close a hint recording
|
|
* session.
|
|
*
|
|
* @input:
|
|
* hints ::
|
|
* A handle to the Type 2 hints recorder.
|
|
*
|
|
* end_point ::
|
|
* The index of the last point in the input glyph.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0 means success.
|
|
*
|
|
* @note:
|
|
* The error code is set to indicate that an error occurred during the
|
|
* recording session.
|
|
*
|
|
*/
|
|
typedef FT_Error
|
|
(*T2_Hints_CloseFunc)( T2_Hints hints,
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|
FT_UInt end_point );
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|
|
|
|
|
/*************************************************************************
|
|
*
|
|
* @functype:
|
|
* T2_Hints_ApplyFunc
|
|
*
|
|
* @description:
|
|
* A method of the @T2_Hints class used to apply hints to the
|
|
* corresponding glyph outline. Must be called after the `close'
|
|
* method.
|
|
*
|
|
* @input:
|
|
* hints ::
|
|
* A handle to the Type 2 hints recorder.
|
|
*
|
|
* outline ::
|
|
* A pointer to the target outline descriptor.
|
|
*
|
|
* globals ::
|
|
* The hinter globals for this font.
|
|
*
|
|
* hint_mode ::
|
|
* Hinting information.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0 means success.
|
|
*
|
|
* @note:
|
|
* On input, all points within the outline are in font coordinates. On
|
|
* output, they are in 1/64th of pixels.
|
|
*
|
|
* The scaling transformation is taken from the `globals' object which
|
|
* must correspond to the same font than the glyph.
|
|
*
|
|
*/
|
|
typedef FT_Error
|
|
(*T2_Hints_ApplyFunc)( T2_Hints hints,
|
|
FT_Outline* outline,
|
|
PSH_Globals globals,
|
|
FT_Render_Mode hint_mode );
|
|
|
|
|
|
/*************************************************************************
|
|
*
|
|
* @struct:
|
|
* T2_Hints_FuncsRec
|
|
*
|
|
* @description:
|
|
* The structure used to provide the API to @T2_Hints objects.
|
|
*
|
|
* @fields:
|
|
* hints ::
|
|
* A handle to the T2 hints recorder object.
|
|
*
|
|
* open ::
|
|
* The function to open a recording session.
|
|
*
|
|
* close ::
|
|
* The function to close a recording session.
|
|
*
|
|
* stems ::
|
|
* The function to set the dimension's stems table.
|
|
*
|
|
* hintmask ::
|
|
* The function to set hint masks.
|
|
*
|
|
* counter ::
|
|
* The function to set counter masks.
|
|
*
|
|
* apply ::
|
|
* The function to apply the hints on the corresponding glyph outline.
|
|
*
|
|
*/
|
|
typedef struct T2_Hints_FuncsRec_
|
|
{
|
|
T2_Hints hints;
|
|
T2_Hints_OpenFunc open;
|
|
T2_Hints_CloseFunc close;
|
|
T2_Hints_StemsFunc stems;
|
|
T2_Hints_MaskFunc hintmask;
|
|
T2_Hints_CounterFunc counter;
|
|
T2_Hints_ApplyFunc apply;
|
|
|
|
} T2_Hints_FuncsRec;
|
|
|
|
|
|
/* */
|
|
|
|
|
|
typedef struct PSHinter_Interface_
|
|
{
|
|
PSH_Globals_Funcs (*get_globals_funcs)( FT_Module module );
|
|
T1_Hints_Funcs (*get_t1_funcs) ( FT_Module module );
|
|
T2_Hints_Funcs (*get_t2_funcs) ( FT_Module module );
|
|
|
|
} PSHinter_Interface;
|
|
|
|
typedef PSHinter_Interface* PSHinter_Service;
|
|
|
|
|
|
#ifndef FT_CONFIG_OPTION_PIC
|
|
|
|
#define FT_DEFINE_PSHINTER_INTERFACE( \
|
|
class_, \
|
|
get_globals_funcs_, \
|
|
get_t1_funcs_, \
|
|
get_t2_funcs_ ) \
|
|
static const PSHinter_Interface class_ = \
|
|
{ \
|
|
get_globals_funcs_, \
|
|
get_t1_funcs_, \
|
|
get_t2_funcs_ \
|
|
};
|
|
|
|
#else /* FT_CONFIG_OPTION_PIC */
|
|
|
|
#define FT_DEFINE_PSHINTER_INTERFACE( \
|
|
class_, \
|
|
get_globals_funcs_, \
|
|
get_t1_funcs_, \
|
|
get_t2_funcs_ ) \
|
|
void \
|
|
FT_Init_Class_ ## class_( FT_Library library, \
|
|
PSHinter_Interface* clazz ) \
|
|
{ \
|
|
FT_UNUSED( library ); \
|
|
\
|
|
clazz->get_globals_funcs = get_globals_funcs_; \
|
|
clazz->get_t1_funcs = get_t1_funcs_; \
|
|
clazz->get_t2_funcs = get_t2_funcs_; \
|
|
}
|
|
|
|
#endif /* FT_CONFIG_OPTION_PIC */
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* __PSHINTS_H__ */
|
|
|
|
|
|
/* END */
|