701 lines
20 KiB
C
701 lines
20 KiB
C
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/****************************************************************************
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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 (C) 2001-2020 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 strange
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* 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 the
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* 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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/***** *****/
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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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||
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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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|
*
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||
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* @description:
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||
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* This is a handle to an opaque structure used to record glyph hints
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||
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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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|
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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 functions
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* do not return an error code.
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*
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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 strange
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||
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* happened (e.g., memory shortage).
|
||
|
|
*
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* The hints accumulated in the object can later be used by the
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||
|
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* Postscript hinter.
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||
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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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||
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/**************************************************************************
|
||
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*
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||
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* @type:
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||
|
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* T2_Hints_Funcs
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*
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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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||
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* a given @T2_Hints object.
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||
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*
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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
|
||
|
|
*
|
||
|
|
* @description:
|
||
|
|
* A method of the @T2_Hints class used to prepare it for a new Type 2
|
||
|
|
* hints recording session.
|
||
|
|
*
|
||
|
|
* @input:
|
||
|
|
* hints ::
|
||
|
|
* A handle to the Type 2 hints recorder.
|
||
|
|
*
|
||
|
|
* @note:
|
||
|
|
* You should always call the @T2_Hints_CloseFunc method in order to
|
||
|
|
* close an opened recording session.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
typedef void
|
||
|
|
(*T2_Hints_OpenFunc)( T2_Hints hints );
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
*
|
||
|
|
* @functype:
|
||
|
|
* T2_Hints_StemsFunc
|
||
|
|
*
|
||
|
|
* @description:
|
||
|
|
* A method of the @T2_Hints class used to set the table of stems in
|
||
|
|
* either the vertical or horizontal dimension. Equivalent to the
|
||
|
|
* 'hstem', 'vstem', 'hstemhm', and 'vstemhm' Type 2 operators.
|
||
|
|
*
|
||
|
|
* @input:
|
||
|
|
* hints ::
|
||
|
|
* A handle to the Type 2 hints recorder.
|
||
|
|
*
|
||
|
|
* dimension ::
|
||
|
|
* 0 for horizontal stems (hstem), 1 for vertical ones (vstem).
|
||
|
|
*
|
||
|
|
* count ::
|
||
|
|
* The number of stems.
|
||
|
|
*
|
||
|
|
* coords ::
|
||
|
|
* An array of 'count' (position,length) pairs in 16.16 format.
|
||
|
|
*
|
||
|
|
* @note:
|
||
|
|
* Use vertical coordinates (y) for horizontal stems (dim=0). Use
|
||
|
|
* horizontal coordinates (x) for vertical stems (dim=1).
|
||
|
|
*
|
||
|
|
* There are '2*count' elements in the 'coords' array. Each even element
|
||
|
|
* is an absolute position in font units, each odd element is a length in
|
||
|
|
* font units.
|
||
|
|
*
|
||
|
|
* A length can be negative, in which case it must be either -20 or -21.
|
||
|
|
* It is interpreted as a 'ghost' stem, according to the Type 1
|
||
|
|
* specification.
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
typedef void
|
||
|
|
(*T2_Hints_StemsFunc)( T2_Hints hints,
|
||
|
|
FT_UInt dimension,
|
||
|
|
FT_Int count,
|
||
|
|
FT_Fixed* coordinates );
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
*
|
||
|
|
* @functype:
|
||
|
|
* T2_Hints_MaskFunc
|
||
|
|
*
|
||
|
|
* @description:
|
||
|
|
* A method of the @T2_Hints class used to set a given hintmask (this
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* 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_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,
|
||
|
|
FT_UInt end_point );
|
||
|
|
|
||
|
|
|
||
|
|
/**************************************************************************
|
||
|
|
*
|
||
|
|
* @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;
|
||
|
|
|
||
|
|
|
||
|
|
#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_ \
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
FT_END_HEADER
|
||
|
|
|
||
|
|
#endif /* PSHINTS_H_ */
|
||
|
|
|
||
|
|
|
||
|
|
/* END */
|