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378 lines
22 KiB
378 lines
22 KiB
/***************************************************************************/ |
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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 1996-2001, 2003, 2004, 2006 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 */ |
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/* Master fonts, i.e., the selection of specific design instances by */ |
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/* setting design axis coordinates. */ |
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/* */ |
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/* George Williams has extended this interface to make it work with */ |
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/* both Type 1 Multiple Masters fonts and GX distortable (var) */ |
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/* fonts. Some of these routines only work with MM fonts, others */ |
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/* will work with both types. They are similar enough that a */ |
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/* 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 simple structure used to model a given axis in design space for */ |
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/* Multiple Masters fonts. */ |
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/* */ |
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/* This structure can't be used for GX var fonts. */ |
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/* */ |
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/* <Fields> */ |
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/* name :: The axis's name. */ |
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/* */ |
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/* minimum :: The axis's minimum design coordinate. */ |
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/* */ |
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/* maximum :: 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 used to model the axes and space of a Multiple Masters */ |
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/* font. */ |
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/* */ |
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/* This structure can't be used for GX var fonts. */ |
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/* */ |
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/* <Fields> */ |
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/* num_axis :: Number of axes. Cannot exceed 4. */ |
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/* */ |
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/* num_designs :: Number of designs; should be normally 2^num_axis */ |
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/* even though the Type 1 specification strangely */ |
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/* allows for intermediate designs to be present. This */ |
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/* number cannot exceed 16. */ |
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/* */ |
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/* axis :: 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 simple structure used to model a given axis in design space for */ |
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/* Multiple Masters and GX var fonts. */ |
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/* */ |
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/* <Fields> */ |
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/* name :: The axis's name. */ |
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/* Not always meaningful for GX. */ |
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/* */ |
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/* minimum :: The axis's minimum design coordinate. */ |
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/* */ |
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/* def :: The axis's default design coordinate. */ |
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/* FreeType computes meaningful default values for MM; it */ |
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/* is then an integer value, not in 16.16 format. */ |
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/* */ |
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/* maximum :: The axis's maximum design coordinate. */ |
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/* */ |
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/* tag :: The axis's tag (the GX equivalent to `name'). */ |
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/* FreeType provides default values for MM if possible. */ |
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/* */ |
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/* strid :: The entry in `name' table (another GX version of */ |
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/* `name'). */ |
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/* Not meaningful for MM. */ |
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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 simple structure used to model a named style in a GX var font. */ |
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/* */ |
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/* This structure can't be used for MM fonts. */ |
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/* */ |
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/* <Fields> */ |
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/* coords :: The design coordinates for this style. */ |
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/* This is an array with one entry for each axis. */ |
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/* */ |
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/* strid :: The entry in `name' table identifying this style. */ |
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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_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 used to model the axes and space of a Multiple Masters */ |
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/* or GX var distortable font. */ |
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/* */ |
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/* Some fields are specific to one format and not to the other. */ |
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/* */ |
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/* <Fields> */ |
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/* num_axis :: The number of axes. The maximum value is 4 for */ |
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/* MM; no limit in GX. */ |
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/* */ |
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/* num_designs :: The number of designs; should be normally */ |
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/* 2^num_axis for MM fonts. Not meaningful for GX */ |
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/* (where every glyph could have a different */ |
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/* number of designs). */ |
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/* */ |
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/* num_namedstyles :: The number of named styles; only meaningful for */ |
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/* GX which allows certain design coordinates to */ |
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/* have a string ID (in the `name' table) */ |
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/* associated with them. The font can tell the */ |
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/* user that, for example, Weight=1.5 is `Bold'. */ |
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/* */ |
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/* axis :: A table of axis descriptors. */ |
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/* GX fonts contain slightly more data than MM. */ |
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/* */ |
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/* namedstyles :: A table of named styles. */ |
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/* Only meaningful with GX. */ |
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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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/* */ |
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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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/* Retrieves the Multiple Master descriptor of a given font. */ |
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/* */ |
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/* This function can't be used with GX fonts. */ |
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/* */ |
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/* <Input> */ |
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/* face :: A handle to the source face. */ |
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/* */ |
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/* <Output> */ |
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/* amaster :: 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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/* Retrieves the Multiple Master/GX var descriptor of a given font. */ |
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/* */ |
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/* <Input> */ |
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/* face :: A handle to the source face. */ |
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/* */ |
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/* <Output> */ |
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/* amaster :: The Multiple Masters descriptor. */ |
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/* Allocates a data structure, which the user must free */ |
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/* (a single call to FT_FREE will do it). */ |
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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_Set_MM_Design_Coordinates */ |
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/* */ |
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/* <Description> */ |
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/* For Multiple Masters fonts, choose an interpolated font design */ |
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/* through design coordinates. */ |
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/* */ |
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/* This function can't be used with GX fonts. */ |
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/* */ |
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/* <InOut> */ |
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/* face :: A handle to the source face. */ |
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/* */ |
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/* <Input> */ |
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/* num_coords :: The number of design coordinates (must be equal to */ |
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/* the number of axes in the font). */ |
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/* */ |
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/* coords :: 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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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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/* For Multiple Master or GX Var fonts, choose an interpolated font */ |
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/* design through design coordinates. */ |
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/* */ |
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/* <InOut> */ |
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/* face :: A handle to the source face. */ |
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/* */ |
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/* <Input> */ |
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/* num_coords :: The number of design coordinates (must be equal to */ |
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/* the number of axes in the font). */ |
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/* */ |
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/* coords :: 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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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_Set_MM_Blend_Coordinates */ |
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/* */ |
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/* <Description> */ |
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/* For Multiple Masters and GX var fonts, choose an interpolated font */ |
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/* design through normalized blend coordinates. */ |
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/* */ |
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/* <InOut> */ |
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/* face :: A handle to the source face. */ |
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/* */ |
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/* <Input> */ |
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/* num_coords :: The number of design coordinates (must be equal to */ |
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/* the number of axes in the font). */ |
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/* */ |
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/* coords :: The design coordinates array (each element must be */ |
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/* between 0 and 1.0). */ |
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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_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_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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FT_END_HEADER |
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#endif /* __FTMM_H__ */ |
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/* END */
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