ref: 757bdf1aef3d93a27968857ac5b4435a52fa24a0
dir: /include/freetype/ftmm.h/
/****************************************************************************
*
* ftmm.h
*
* FreeType Multiple Master font interface (specification).
*
* Copyright 1996-2018 by
* David Turner, Robert Wilhelm, and Werner Lemberg.
*
* This file is part of the FreeType project, and may only be used,
* modified, and distributed under the terms of the FreeType project
* license, LICENSE.TXT. By continuing to use, modify, or distribute
* this file you indicate that you have read the license and
* understand and accept it fully.
*
*/
#ifndef FTMM_H_
#define FTMM_H_
#include <ft2build.h>
#include FT_TYPE1_TABLES_H
FT_BEGIN_HEADER
/**************************************************************************
*
* @section:
* multiple_masters
*
* @title:
* Multiple Masters
*
* @abstract:
* How to manage Multiple Masters fonts.
*
* @description:
* The following types and functions are used to manage Multiple
* Master fonts, i.e., the selection of specific design instances by
* setting design axis coordinates.
*
* Besides Adobe MM fonts, the interface supports Apple's TrueType GX
* and OpenType variation fonts. Some of the routines only work with
* Adobe MM fonts, others will work with all three types. They are
* similar enough that a consistent interface makes sense.
*
*/
/**************************************************************************
*
* @struct:
* FT_MM_Axis
*
* @description:
* A structure to model a given axis in design space for Multiple
* Masters fonts.
*
* This structure can't be used for TrueType GX or OpenType variation
* fonts.
*
* @fields:
* name ::
* The axis's name.
*
* minimum ::
* The axis's minimum design coordinate.
*
* maximum ::
* The axis's maximum design coordinate.
*/
typedef struct FT_MM_Axis_
{
FT_String* name;
FT_Long minimum;
FT_Long maximum;
} FT_MM_Axis;
/**************************************************************************
*
* @struct:
* FT_Multi_Master
*
* @description:
* A structure to model the axes and space of a Multiple Masters
* font.
*
* This structure can't be used for TrueType GX or OpenType variation
* fonts.
*
* @fields:
* num_axis ::
* Number of axes. Cannot exceed~4.
*
* num_designs ::
* Number of designs; should be normally 2^num_axis
* even though the Type~1 specification strangely
* allows for intermediate designs to be present.
* This number cannot exceed~16.
*
* axis ::
* A table of axis descriptors.
*/
typedef struct FT_Multi_Master_
{
FT_UInt num_axis;
FT_UInt num_designs;
FT_MM_Axis axis[T1_MAX_MM_AXIS];
} FT_Multi_Master;
/**************************************************************************
*
* @struct:
* FT_Var_Axis
*
* @description:
* A structure to model a given axis in design space for Multiple
* Masters, TrueType GX, and OpenType variation fonts.
*
* @fields:
* name ::
* The axis's name.
* Not always meaningful for TrueType GX or OpenType
* variation fonts.
*
* minimum ::
* The axis's minimum design coordinate.
*
* def ::
* The axis's default design coordinate.
* FreeType computes meaningful default values for Adobe
* MM fonts.
*
* maximum ::
* The axis's maximum design coordinate.
*
* tag ::
* The axis's tag (the equivalent to `name' for TrueType
* GX and OpenType variation fonts). FreeType provides
* default values for Adobe MM fonts if possible.
*
* strid ::
* The axis name entry in the font's `name' table. This
* is another (and often better) version of the `name'
* field for TrueType GX or OpenType variation fonts. Not
* meaningful for Adobe MM fonts.
*
* @note:
* The fields `minimum', `def', and `maximum' are 16.16 fractional
* values for TrueType GX and OpenType variation fonts. For Adobe MM
* fonts, the values are integers.
*/
typedef struct FT_Var_Axis_
{
FT_String* name;
FT_Fixed minimum;
FT_Fixed def;
FT_Fixed maximum;
FT_ULong tag;
FT_UInt strid;
} FT_Var_Axis;
/**************************************************************************
*
* @struct:
* FT_Var_Named_Style
*
* @description:
* A structure to model a named instance in a TrueType GX or OpenType
* variation font.
*
* This structure can't be used for Adobe MM fonts.
*
* @fields:
* coords ::
* The design coordinates for this instance.
* This is an array with one entry for each axis.
*
* strid ::
* The entry in `name' table identifying this instance.
*
* psid ::
* The entry in `name' table identifying a PostScript name
* for this instance. Value 0xFFFF indicates a missing
* entry.
*/
typedef struct FT_Var_Named_Style_
{
FT_Fixed* coords;
FT_UInt strid;
FT_UInt psid; /* since 2.7.1 */
} FT_Var_Named_Style;
/**************************************************************************
*
* @struct:
* FT_MM_Var
*
* @description:
* A structure to model the axes and space of an Adobe MM, TrueType
* GX, or OpenType variation font.
*
* Some fields are specific to one format and not to the others.
*
* @fields:
* num_axis ::
* The number of axes. The maximum value is~4 for
* Adobe MM fonts; no limit in TrueType GX or
* OpenType variation fonts.
*
* num_designs ::
* The number of designs; should be normally
* 2^num_axis for Adobe MM fonts. Not meaningful
* for TrueType GX or OpenType variation fonts
* (where every glyph could have a different
* number of designs).
*
* num_namedstyles ::
* The number of named styles; a `named style' is
* a tuple of design coordinates that has a string
* ID (in the `name' table) associated with it.
* The font can tell the user that, for example,
* [Weight=1.5,Width=1.1] is `Bold'. Another name
* for `named style' is `named instance'.
*
* For Adobe Multiple Masters fonts, this value is
* always zero because the format does not support
* named styles.
*
* axis ::
* An axis descriptor table.
* TrueType GX and OpenType variation fonts
* contain slightly more data than Adobe MM fonts.
* Memory management of this pointer is done
* internally by FreeType.
*
* namedstyle ::
* A named style (instance) table.
* Only meaningful for TrueType GX and OpenType
* variation fonts. Memory management of this
* pointer is done internally by FreeType.
*/
typedef struct FT_MM_Var_
{
FT_UInt num_axis;
FT_UInt num_designs;
FT_UInt num_namedstyles;
FT_Var_Axis* axis;
FT_Var_Named_Style* namedstyle;
} FT_MM_Var;
/**************************************************************************
*
* @function:
* FT_Get_Multi_Master
*
* @description:
* Retrieve a variation descriptor of a given Adobe MM font.
*
* This function can't be used with TrueType GX or OpenType variation
* fonts.
*
* @input:
* face ::
* A handle to the source face.
*
* @output:
* amaster ::
* The Multiple Masters descriptor.
*
* @return:
* FreeType error code. 0~means success.
*/
FT_EXPORT( FT_Error )
FT_Get_Multi_Master( FT_Face face,
FT_Multi_Master *amaster );
/**************************************************************************
*
* @function:
* FT_Get_MM_Var
*
* @description:
* Retrieve a variation descriptor for a given font.
*
* This function works with all supported variation formats.
*
* @input:
* face ::
* A handle to the source face.
*
* @output:
* amaster ::
* The variation descriptor.
* Allocates a data structure, which the user must
* deallocate with a call to @FT_Done_MM_Var after use.
*
* @return:
* FreeType error code. 0~means success.
*/
FT_EXPORT( FT_Error )
FT_Get_MM_Var( FT_Face face,
FT_MM_Var* *amaster );
/**************************************************************************
*
* @function:
* FT_Done_MM_Var
*
* @description:
* Free the memory allocated by @FT_Get_MM_Var.
*
* @input:
* library ::
* A handle of the face's parent library object that was
* used in the call to @FT_Get_MM_Var to create `amaster'.
*
* @return:
* FreeType error code. 0~means success.
*/
FT_EXPORT( FT_Error )
FT_Done_MM_Var( FT_Library library,
FT_MM_Var *amaster );
/**************************************************************************
*
* @function:
* FT_Set_MM_Design_Coordinates
*
* @description:
* For Adobe MM fonts, choose an interpolated font design through
* design coordinates.
*
* This function can't be used with TrueType GX or OpenType variation
* fonts.
*
* @inout:
* face ::
* A handle to the source face.
*
* @input:
* num_coords ::
* The number of available design coordinates. If it
* is larger than the number of axes, ignore the excess
* values. If it is smaller than the number of axes,
* use default values for the remaining axes.
*
* coords ::
* An array of design coordinates.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* [Since 2.8.1] To reset all axes to the default values, call the
* function with `num_coords' set to zero and `coords' set to NULL.
*
* [Since 2.9] If `num_coords' is larger than zero, this function
* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags'
* field (i.e., @FT_IS_VARIATION will return true). If `num_coords'
* is zero, this bit flag gets unset.
*/
FT_EXPORT( FT_Error )
FT_Set_MM_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Long* coords );
/**************************************************************************
*
* @function:
* FT_Set_Var_Design_Coordinates
*
* @description:
* Choose an interpolated font design through design coordinates.
*
* This function works with all supported variation formats.
*
* @inout:
* face ::
* A handle to the source face.
*
* @input:
* num_coords ::
* The number of available design coordinates. If it
* is larger than the number of axes, ignore the excess
* values. If it is smaller than the number of axes,
* use default values for the remaining axes.
*
* coords ::
* An array of design coordinates.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* [Since 2.8.1] To reset all axes to the default values, call the
* function with `num_coords' set to zero and `coords' set to NULL.
* [Since 2.9] `Default values' means the currently selected named
* instance (or the base font if no named instance is selected).
*
* [Since 2.9] If `num_coords' is larger than zero, this function
* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags'
* field (i.e., @FT_IS_VARIATION will return true). If `num_coords'
* is zero, this bit flag gets unset.
*/
FT_EXPORT( FT_Error )
FT_Set_Var_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @function:
* FT_Get_Var_Design_Coordinates
*
* @description:
* Get the design coordinates of the currently selected interpolated
* font.
*
* This function works with all supported variation formats.
*
* @input:
* face ::
* A handle to the source face.
*
* num_coords ::
* The number of design coordinates to retrieve. If it
* is larger than the number of axes, set the excess
* values to~0.
*
* @output:
* coords ::
* The design coordinates array.
*
* @return:
* FreeType error code. 0~means success.
*
* @since:
* 2.7.1
*/
FT_EXPORT( FT_Error )
FT_Get_Var_Design_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @function:
* FT_Set_MM_Blend_Coordinates
*
* @description:
* Choose an interpolated font design through normalized blend
* coordinates.
*
* This function works with all supported variation formats.
*
* @inout:
* face ::
* A handle to the source face.
*
* @input:
* num_coords ::
* The number of available design coordinates. If it
* is larger than the number of axes, ignore the excess
* values. If it is smaller than the number of axes,
* use default values for the remaining axes.
*
* coords ::
* The design coordinates array (each element must be
* between 0 and 1.0 for Adobe MM fonts, and between
* -1.0 and 1.0 for TrueType GX and OpenType variation
* fonts).
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* [Since 2.8.1] To reset all axes to the default values, call the
* function with `num_coords' set to zero and `coords' set to NULL.
* [Since 2.9] `Default values' means the currently selected named
* instance (or the base font if no named instance is selected).
*
* [Since 2.9] If `num_coords' is larger than zero, this function
* sets the @FT_FACE_FLAG_VARIATION bit in @FT_Face's `face_flags'
* field (i.e., @FT_IS_VARIATION will return true). If `num_coords'
* is zero, this bit flag gets unset.
*/
FT_EXPORT( FT_Error )
FT_Set_MM_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @function:
* FT_Get_MM_Blend_Coordinates
*
* @description:
* Get the normalized blend coordinates of the currently selected
* interpolated font.
*
* This function works with all supported variation formats.
*
* @input:
* face ::
* A handle to the source face.
*
* num_coords ::
* The number of normalized blend coordinates to
* retrieve. If it is larger than the number of axes,
* set the excess values to~0.5 for Adobe MM fonts, and
* to~0 for TrueType GX and OpenType variation fonts.
*
* @output:
* coords ::
* The normalized blend coordinates array.
*
* @return:
* FreeType error code. 0~means success.
*
* @since:
* 2.7.1
*/
FT_EXPORT( FT_Error )
FT_Get_MM_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @function:
* FT_Set_Var_Blend_Coordinates
*
* @description:
* This is another name of @FT_Set_MM_Blend_Coordinates.
*/
FT_EXPORT( FT_Error )
FT_Set_Var_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @function:
* FT_Get_Var_Blend_Coordinates
*
* @description:
* This is another name of @FT_Get_MM_Blend_Coordinates.
*
* @since:
* 2.7.1
*/
FT_EXPORT( FT_Error )
FT_Get_Var_Blend_Coordinates( FT_Face face,
FT_UInt num_coords,
FT_Fixed* coords );
/**************************************************************************
*
* @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 */