754 lines
21 KiB
C
754 lines
21 KiB
C
/****************************************************************************
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*
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* ftmm.h
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*
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* FreeType Multiple Master font interface (specification).
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*
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* Copyright (C) 1996-2020 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 FTMM_H_
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#define FTMM_H_
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#include <ft2build.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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* @section:
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* multiple_masters
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*
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* @title:
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* Multiple Masters
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*
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* @abstract:
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* How to manage Multiple Masters fonts.
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*
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* @description:
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* The following types and functions are used to manage Multiple Master
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* fonts, i.e., the selection of specific design instances by setting
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* design axis coordinates.
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*
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* Besides Adobe MM fonts, the interface supports Apple's TrueType GX and
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* OpenType variation fonts. Some of the routines only work with Adobe
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* MM fonts, others will work with all three types. They are similar
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* enough that a consistent interface makes sense.
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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_MM_Axis
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*
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* @description:
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* A structure to model a given axis in design space for Multiple Masters
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* fonts.
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*
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* This structure can't be used for TrueType GX or OpenType variation
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* fonts.
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*
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* @fields:
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* name ::
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* The axis's name.
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*
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* minimum ::
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* The axis's minimum design coordinate.
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*
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* maximum ::
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* The axis's maximum design coordinate.
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*/
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typedef struct FT_MM_Axis_
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{
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FT_String* name;
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FT_Long minimum;
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FT_Long maximum;
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} FT_MM_Axis;
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/**************************************************************************
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*
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* @struct:
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* FT_Multi_Master
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*
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* @description:
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* A structure to model the axes and space of a Multiple Masters font.
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*
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* This structure can't be used for TrueType GX or OpenType variation
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* fonts.
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*
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* @fields:
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* num_axis ::
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* Number of axes. Cannot exceed~4.
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*
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* num_designs ::
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* Number of designs; should be normally 2^num_axis even though the
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* Type~1 specification strangely allows for intermediate designs to be
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* present. This number cannot exceed~16.
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*
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* axis ::
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* A table of axis descriptors.
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*/
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typedef struct FT_Multi_Master_
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{
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FT_UInt num_axis;
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FT_UInt num_designs;
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FT_MM_Axis axis[T1_MAX_MM_AXIS];
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} FT_Multi_Master;
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/**************************************************************************
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*
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* @struct:
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* FT_Var_Axis
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*
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* @description:
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* A structure to model a given axis in design space for Multiple
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* Masters, TrueType GX, and OpenType variation fonts.
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*
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* @fields:
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* name ::
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* The axis's name. Not always meaningful for TrueType GX or OpenType
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* variation fonts.
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*
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* minimum ::
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* The axis's minimum design coordinate.
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*
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* def ::
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* The axis's default design coordinate. FreeType computes meaningful
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* default values for Adobe MM fonts.
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*
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* maximum ::
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* The axis's maximum design coordinate.
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*
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* tag ::
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* The axis's tag (the equivalent to 'name' for TrueType GX and
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* OpenType variation fonts). FreeType provides default values for
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* Adobe MM fonts if possible.
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*
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* strid ::
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* The axis name entry in the font's 'name' table. This is another
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* (and often better) version of the 'name' field for TrueType GX or
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* OpenType variation fonts. Not meaningful for Adobe MM fonts.
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*
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* @note:
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* The fields `minimum`, `def`, and `maximum` are 16.16 fractional values
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* for TrueType GX and OpenType variation fonts. For Adobe MM fonts, the
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* values are integers.
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*/
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typedef struct FT_Var_Axis_
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{
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FT_String* name;
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FT_Fixed minimum;
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FT_Fixed def;
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FT_Fixed maximum;
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FT_ULong tag;
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FT_UInt strid;
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} FT_Var_Axis;
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/**************************************************************************
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*
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* @struct:
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* FT_Var_Named_Style
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*
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* @description:
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* A structure to model a named instance in a TrueType GX or OpenType
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* variation font.
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*
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* This structure can't be used for Adobe MM fonts.
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*
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* @fields:
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* coords ::
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* The design coordinates for this instance. This is an array with one
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* entry for each axis.
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*
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* strid ::
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* The entry in 'name' table identifying this instance.
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*
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* psid ::
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* The entry in 'name' table identifying a PostScript name for this
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* instance. Value 0xFFFF indicates a missing entry.
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*/
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typedef struct FT_Var_Named_Style_
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{
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FT_Fixed* coords;
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FT_UInt strid;
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FT_UInt psid; /* since 2.7.1 */
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} FT_Var_Named_Style;
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/**************************************************************************
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*
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* @struct:
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* FT_MM_Var
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*
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* @description:
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* A structure to model the axes and space of an Adobe MM, TrueType GX,
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* or OpenType variation font.
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*
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* Some fields are specific to one format and not to the others.
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*
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* @fields:
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* num_axis ::
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* The number of axes. The maximum value is~4 for Adobe MM fonts; no
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* limit in TrueType GX or OpenType variation fonts.
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*
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* num_designs ::
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* The number of designs; should be normally 2^num_axis for Adobe MM
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* fonts. Not meaningful for TrueType GX or OpenType variation fonts
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* (where every glyph could have a different number of designs).
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*
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* num_namedstyles ::
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* The number of named styles; a 'named style' is a tuple of design
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* coordinates that has a string ID (in the 'name' table) associated
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* with it. The font can tell the user that, for example,
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* [Weight=1.5,Width=1.1] is 'Bold'. Another name for 'named style' is
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* 'named instance'.
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*
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* For Adobe Multiple Masters fonts, this value is always zero because
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* the format does not support named styles.
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*
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* axis ::
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* An axis descriptor table. TrueType GX and OpenType variation fonts
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* contain slightly more data than Adobe MM fonts. Memory management
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* of this pointer is done internally by FreeType.
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*
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* namedstyle ::
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* A named style (instance) table. Only meaningful for TrueType GX and
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* OpenType variation fonts. Memory management of this pointer is done
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* internally by FreeType.
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*/
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typedef struct FT_MM_Var_
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{
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FT_UInt num_axis;
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FT_UInt num_designs;
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FT_UInt num_namedstyles;
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FT_Var_Axis* axis;
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FT_Var_Named_Style* namedstyle;
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} FT_MM_Var;
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/**************************************************************************
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*
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* @function:
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* FT_Get_Multi_Master
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*
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* @description:
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* Retrieve a variation descriptor of a given Adobe MM font.
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*
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* This function can't be used with TrueType GX or OpenType variation
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* fonts.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* @output:
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* amaster ::
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* The Multiple Masters descriptor.
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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_EXPORT( FT_Error )
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FT_Get_Multi_Master( FT_Face face,
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FT_Multi_Master *amaster );
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/**************************************************************************
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*
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* @function:
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* FT_Get_MM_Var
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*
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* @description:
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* Retrieve a variation descriptor for a given font.
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*
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* This function works with all supported variation formats.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* @output:
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* amaster ::
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* The variation descriptor. Allocates a data structure, which the
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* user must deallocate with a call to @FT_Done_MM_Var after use.
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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_EXPORT( FT_Error )
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FT_Get_MM_Var( FT_Face face,
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FT_MM_Var* *amaster );
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/**************************************************************************
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*
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* @function:
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* FT_Done_MM_Var
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*
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* @description:
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* Free the memory allocated by @FT_Get_MM_Var.
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*
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* @input:
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* library ::
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* A handle of the face's parent library object that was used in the
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* call to @FT_Get_MM_Var to create `amaster`.
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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_EXPORT( FT_Error )
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FT_Done_MM_Var( FT_Library library,
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FT_MM_Var *amaster );
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/**************************************************************************
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*
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* @function:
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* FT_Set_MM_Design_Coordinates
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*
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* @description:
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* For Adobe MM fonts, choose an interpolated font design through design
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* coordinates.
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*
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* This function can't be used with TrueType GX or OpenType variation
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* fonts.
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*
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* @inout:
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* face ::
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* A handle to the source face.
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*
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* @input:
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* num_coords ::
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* The number of available design coordinates. If it is larger than
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* the number of axes, ignore the excess values. If it is smaller than
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* the number of axes, use default values for the remaining axes.
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*
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* coords ::
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* An array of design coordinates.
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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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* [Since 2.8.1] To reset all axes to the default values, call the
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* function with `num_coords` set to zero and `coords` set to `NULL`.
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*
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* [Since 2.9] If `num_coords` is larger than zero, this function sets
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* the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags` field
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* (i.e., @FT_IS_VARIATION will return true). If `num_coords` is zero,
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* this bit flag gets unset.
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*/
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FT_EXPORT( FT_Error )
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FT_Set_MM_Design_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Long* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Set_Var_Design_Coordinates
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*
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* @description:
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* Choose an interpolated font design through design coordinates.
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*
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* This function works with all supported variation formats.
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*
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* @inout:
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* face ::
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* A handle to the source face.
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*
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* @input:
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* num_coords ::
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* The number of available design coordinates. If it is larger than
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* the number of axes, ignore the excess values. If it is smaller than
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* the number of axes, use default values for the remaining axes.
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*
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* coords ::
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* An array of design coordinates.
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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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* [Since 2.8.1] To reset all axes to the default values, call the
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* function with `num_coords` set to zero and `coords` set to `NULL`.
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* [Since 2.9] 'Default values' means the currently selected named
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* instance (or the base font if no named instance is selected).
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*
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* [Since 2.9] If `num_coords` is larger than zero, this function sets
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* the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags` field
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* (i.e., @FT_IS_VARIATION will return true). If `num_coords` is zero,
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* this bit flag gets unset.
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*/
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FT_EXPORT( FT_Error )
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FT_Set_Var_Design_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Get_Var_Design_Coordinates
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*
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* @description:
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* Get the design coordinates of the currently selected interpolated
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* font.
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*
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* This function works with all supported variation formats.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* num_coords ::
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* The number of design coordinates to retrieve. If it is larger than
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* the number of axes, set the excess values to~0.
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*
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* @output:
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* coords ::
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* The design coordinates array.
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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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* @since:
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* 2.7.1
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*/
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FT_EXPORT( FT_Error )
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FT_Get_Var_Design_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Set_MM_Blend_Coordinates
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*
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* @description:
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* Choose an interpolated font design through normalized blend
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* coordinates.
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*
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* This function works with all supported variation formats.
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*
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* @inout:
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* face ::
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* A handle to the source face.
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*
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* @input:
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* num_coords ::
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* The number of available design coordinates. If it is larger than
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* the number of axes, ignore the excess values. If it is smaller than
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* the number of axes, use default values for the remaining axes.
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*
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* coords ::
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* The design coordinates array (each element must be between 0 and 1.0
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* for Adobe MM fonts, and between -1.0 and 1.0 for TrueType GX and
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* OpenType variation fonts).
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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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* [Since 2.8.1] To reset all axes to the default values, call the
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* function with `num_coords` set to zero and `coords` set to `NULL`.
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* [Since 2.9] 'Default values' means the currently selected named
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* instance (or the base font if no named instance is selected).
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*
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* [Since 2.9] If `num_coords` is larger than zero, this function sets
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* the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags` field
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* (i.e., @FT_IS_VARIATION will return true). If `num_coords` is zero,
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* this bit flag gets unset.
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*/
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FT_EXPORT( FT_Error )
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FT_Set_MM_Blend_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Get_MM_Blend_Coordinates
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*
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* @description:
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* Get the normalized blend coordinates of the currently selected
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* interpolated font.
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*
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* This function works with all supported variation formats.
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*
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* @input:
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* face ::
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* A handle to the source face.
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*
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* num_coords ::
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* The number of normalized blend coordinates to retrieve. If it is
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* larger than the number of axes, set the excess values to~0.5 for
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* Adobe MM fonts, and to~0 for TrueType GX and OpenType variation
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* fonts.
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*
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* @output:
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* coords ::
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* The normalized blend coordinates array.
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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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* @since:
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* 2.7.1
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*/
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FT_EXPORT( FT_Error )
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FT_Get_MM_Blend_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Set_Var_Blend_Coordinates
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*
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* @description:
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* This is another name of @FT_Set_MM_Blend_Coordinates.
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*/
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FT_EXPORT( FT_Error )
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FT_Set_Var_Blend_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Get_Var_Blend_Coordinates
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*
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* @description:
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* This is another name of @FT_Get_MM_Blend_Coordinates.
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*
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* @since:
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* 2.7.1
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*/
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FT_EXPORT( FT_Error )
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FT_Get_Var_Blend_Coordinates( FT_Face face,
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FT_UInt num_coords,
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FT_Fixed* coords );
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/**************************************************************************
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*
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* @function:
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* FT_Set_MM_WeightVector
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*
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* @description:
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* For Adobe MM fonts, choose an interpolated font design by directly
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* setting the weight vector.
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*
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* This function can't be used with TrueType GX or OpenType variation
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* fonts.
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*
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* @inout:
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* face ::
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* A handle to the source face.
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*
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* @input:
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* len ::
|
|
* The length of the weight vector array. If it is larger than the
|
|
* number of designs, the extra values are ignored. If it is less than
|
|
* the number of designs, the remaining values are set to zero.
|
|
*
|
|
* weightvector ::
|
|
* An array representing the weight vector.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0~means success.
|
|
*
|
|
* @note:
|
|
* Adobe Multiple Master fonts limit the number of designs, and thus the
|
|
* length of the weight vector to~16.
|
|
*
|
|
* If `len` is zero and `weightvector` is `NULL`, the weight vector array
|
|
* is reset to the default values.
|
|
*
|
|
* The Adobe documentation also states that the values in the
|
|
* WeightVector array must total 1.0 +/-~0.001. In practice this does
|
|
* not seem to be enforced, so is not enforced here, either.
|
|
*
|
|
* @since:
|
|
* 2.10
|
|
*/
|
|
FT_EXPORT( FT_Error )
|
|
FT_Set_MM_WeightVector( FT_Face face,
|
|
FT_UInt len,
|
|
FT_Fixed* weightvector );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @function:
|
|
* FT_Get_MM_WeightVector
|
|
*
|
|
* @description:
|
|
* For Adobe MM fonts, retrieve the current weight vector of the font.
|
|
*
|
|
* This function can't be used with TrueType GX or OpenType variation
|
|
* fonts.
|
|
*
|
|
* @inout:
|
|
* face ::
|
|
* A handle to the source face.
|
|
*
|
|
* len ::
|
|
* A pointer to the size of the array to be filled. If the size of the
|
|
* array is less than the number of designs, `FT_Err_Invalid_Argument`
|
|
* is returned, and `len` is set to the required size (the number of
|
|
* designs). If the size of the array is greater than the number of
|
|
* designs, the remaining entries are set to~0. On successful
|
|
* completion, `len` is set to the number of designs (i.e., the number
|
|
* of values written to the array).
|
|
*
|
|
* @output:
|
|
* weightvector ::
|
|
* An array to be filled.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0~means success.
|
|
*
|
|
* @note:
|
|
* Adobe Multiple Master fonts limit the number of designs, and thus the
|
|
* length of the WeightVector to~16.
|
|
*
|
|
* @since:
|
|
* 2.10
|
|
*/
|
|
FT_EXPORT( FT_Error )
|
|
FT_Get_MM_WeightVector( FT_Face face,
|
|
FT_UInt* len,
|
|
FT_Fixed* weightvector );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @enum:
|
|
* FT_VAR_AXIS_FLAG_XXX
|
|
*
|
|
* @description:
|
|
* A list of bit flags used in the return value of
|
|
* @FT_Get_Var_Axis_Flags.
|
|
*
|
|
* @values:
|
|
* FT_VAR_AXIS_FLAG_HIDDEN ::
|
|
* The variation axis should not be exposed to user interfaces.
|
|
*
|
|
* @since:
|
|
* 2.8.1
|
|
*/
|
|
#define FT_VAR_AXIS_FLAG_HIDDEN 1
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @function:
|
|
* FT_Get_Var_Axis_Flags
|
|
*
|
|
* @description:
|
|
* Get the 'flags' field of an OpenType Variation Axis Record.
|
|
*
|
|
* Not meaningful for Adobe MM fonts (`*flags` is always zero).
|
|
*
|
|
* @input:
|
|
* master ::
|
|
* The variation descriptor.
|
|
*
|
|
* axis_index ::
|
|
* The index of the requested variation axis.
|
|
*
|
|
* @output:
|
|
* flags ::
|
|
* The 'flags' field. See @FT_VAR_AXIS_FLAG_XXX for possible values.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0~means success.
|
|
*
|
|
* @since:
|
|
* 2.8.1
|
|
*/
|
|
FT_EXPORT( FT_Error )
|
|
FT_Get_Var_Axis_Flags( FT_MM_Var* master,
|
|
FT_UInt axis_index,
|
|
FT_UInt* flags );
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @function:
|
|
* FT_Set_Named_Instance
|
|
*
|
|
* @description:
|
|
* Set or change the current named instance.
|
|
*
|
|
* @input:
|
|
* face ::
|
|
* A handle to the source face.
|
|
*
|
|
* instance_index ::
|
|
* The index of the requested instance, starting with value 1. If set
|
|
* to value 0, FreeType switches to font access without a named
|
|
* instance.
|
|
*
|
|
* @return:
|
|
* FreeType error code. 0~means success.
|
|
*
|
|
* @note:
|
|
* The function uses the value of `instance_index` to set bits 16-30 of
|
|
* the face's `face_index` field. It also resets any variation applied
|
|
* to the font, and the @FT_FACE_FLAG_VARIATION bit of the face's
|
|
* `face_flags` field gets reset to zero (i.e., @FT_IS_VARIATION will
|
|
* return false).
|
|
*
|
|
* For Adobe MM fonts (which don't have named instances) this function
|
|
* simply resets the current face to the default instance.
|
|
*
|
|
* @since:
|
|
* 2.9
|
|
*/
|
|
FT_EXPORT( FT_Error )
|
|
FT_Set_Named_Instance( FT_Face face,
|
|
FT_UInt instance_index );
|
|
|
|
/* */
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* FTMM_H_ */
|
|
|
|
|
|
/* END */
|