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/***************************************************************************/
/*
*/
/* freetype.h
*/
/*
*/
/* FreeType high-level API and common types (specification only).
*/
/*
*/
/* Copyright 1996-2017 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 FREETYPE_H_
#define FREETYPE_H_
#ifndef FT_FREETYPE_H
#error "`ft2build.h' hasn't been included yet!"
#error "Please always use macros to include FreeType header
files."
#error "Example:"
#error " #include <ft2build.h>"
#error " #include FT_FREETYPE_H"
#endif
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_TYPES_H
#include FT_ERRORS_H
FT_BEGIN_HEADER
/*************************************************************************/
/*
*/
/* <Section>
*/
/* header_inclusion
*/
/*
*/
/* <Title>
*/
/* FreeType's header inclusion scheme
*/
/*
*/
/* <Abstract>
*/
/* How client applications should include FreeType header files.
*/
/*
*/
/* <Description>
*/
/* To be as flexible as possible (and for historical reasons),
*/
/* FreeType uses a very special inclusion scheme to load header
*/
/* files, for example
*/
/*
*/
/* {
*/
/* #include <ft2build.h>
*/
/*
*/
/* #include FT_FREETYPE_H
*/
/* #include FT_OUTLINE_H
*/
/* }
*/
/*
*/
/* A compiler and its preprocessor only needs an include path to find
*/
/* the file `ft2build.h'; the exact locations and names of the
other */
/* FreeType header files are hidden by preprocessor macro names,
*/
/* loaded by `ft2build.h'. The API documentation always gives
the */
/* header macro name needed for a particular function.
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Section>
*/
/* user_allocation
*/
/*
*/
/* <Title>
*/
/* User allocation
*/
/*
*/
/* <Abstract>
*/
/* How client applications should allocate FreeType data structures.
*/
/*
*/
/* <Description>
*/
/* FreeType assumes that structures allocated by the user and passed
*/
/* as arguments are zeroed out except for the actual data. In other
*/
/* words, it is recommended to use `calloc' (or variants of it)
*/
/* instead of `malloc' for allocation.
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* B A S I C T Y P E S
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Section>
*/
/* base_interface
*/
/*
*/
/* <Title>
*/
/* Base Interface
*/
/*
*/
/* <Abstract>
*/
/* The FreeType~2 base font interface.
*/
/*
*/
/* <Description>
*/
/* This section describes the most important public high-level API
*/
/* functions of FreeType~2.
*/
/*
*/
/* <Order>
*/
/* FT_Library
*/
/* FT_Face
*/
/* FT_Size
*/
/* FT_GlyphSlot
*/
/* FT_CharMap
*/
/* FT_Encoding
*/
/* FT_ENC_TAG
*/
/*
*/
/* FT_FaceRec
*/
/*
*/
/* FT_FACE_FLAG_SCALABLE
*/
/* FT_FACE_FLAG_FIXED_SIZES
*/
/* FT_FACE_FLAG_FIXED_WIDTH
*/
/* FT_FACE_FLAG_HORIZONTAL
*/
/* FT_FACE_FLAG_VERTICAL
*/
/* FT_FACE_FLAG_COLOR
*/
/* FT_FACE_FLAG_SFNT
*/
/* FT_FACE_FLAG_CID_KEYED
*/
/* FT_FACE_FLAG_TRICKY
*/
/* FT_FACE_FLAG_KERNING
*/
/* FT_FACE_FLAG_MULTIPLE_MASTERS
*/
/* FT_FACE_FLAG_GLYPH_NAMES
*/
/* FT_FACE_FLAG_EXTERNAL_STREAM
*/
/* FT_FACE_FLAG_HINTER
*/
/*
*/
/* FT_HAS_HORIZONTAL
*/
/* FT_HAS_VERTICAL
*/
/* FT_HAS_KERNING
*/
/* FT_HAS_FIXED_SIZES
*/
/* FT_HAS_GLYPH_NAMES
*/
/* FT_HAS_MULTIPLE_MASTERS
*/
/* FT_HAS_COLOR
*/
/*
*/
/* FT_IS_SFNT
*/
/* FT_IS_SCALABLE
*/
/* FT_IS_FIXED_WIDTH
*/
/* FT_IS_CID_KEYED
*/
/* FT_IS_TRICKY
*/
/*
*/
/* FT_STYLE_FLAG_BOLD
*/
/* FT_STYLE_FLAG_ITALIC
*/
/*
*/
/* FT_SizeRec
*/
/* FT_Size_Metrics
*/
/*
*/
/* FT_GlyphSlotRec
*/
/* FT_Glyph_Metrics
*/
/* FT_SubGlyph
*/
/*
*/
/* FT_Bitmap_Size
*/
/*
*/
/* FT_Init_FreeType
*/
/* FT_Done_FreeType
*/
/*
*/
/* FT_New_Face
*/
/* FT_Done_Face
*/
/* FT_Reference_Face
*/
/* FT_New_Memory_Face
*/
/* FT_Face_Properties
*/
/* FT_Open_Face
*/
/* FT_Open_Args
*/
/* FT_Parameter
*/
/* FT_Attach_File
*/
/* FT_Attach_Stream
*/
/*
*/
/* FT_Set_Char_Size
*/
/* FT_Set_Pixel_Sizes
*/
/* FT_Request_Size
*/
/* FT_Select_Size
*/
/* FT_Size_Request_Type
*/
/* FT_Size_RequestRec
*/
/* FT_Size_Request
*/
/* FT_Set_Transform
*/
/* FT_Load_Glyph
*/
/* FT_Get_Char_Index
*/
/* FT_Get_First_Char
*/
/* FT_Get_Next_Char
*/
/* FT_Get_Name_Index
*/
/* FT_Load_Char
*/
/*
*/
/* FT_OPEN_MEMORY
*/
/* FT_OPEN_STREAM
*/
/* FT_OPEN_PATHNAME
*/
/* FT_OPEN_DRIVER
*/
/* FT_OPEN_PARAMS
*/
/*
*/
/* FT_LOAD_DEFAULT
*/
/* FT_LOAD_RENDER
*/
/* FT_LOAD_MONOCHROME
*/
/* FT_LOAD_LINEAR_DESIGN
*/
/* FT_LOAD_NO_SCALE
*/
/* FT_LOAD_NO_HINTING
*/
/* FT_LOAD_NO_BITMAP
*/
/* FT_LOAD_NO_AUTOHINT
*/
/* FT_LOAD_COLOR
*/
/*
*/
/* FT_LOAD_VERTICAL_LAYOUT
*/
/* FT_LOAD_IGNORE_TRANSFORM
*/
/* FT_LOAD_FORCE_AUTOHINT
*/
/* FT_LOAD_NO_RECURSE
*/
/* FT_LOAD_PEDANTIC
*/
/*
*/
/* FT_LOAD_TARGET_NORMAL
*/
/* FT_LOAD_TARGET_LIGHT
*/
/* FT_LOAD_TARGET_MONO
*/
/* FT_LOAD_TARGET_LCD
*/
/* FT_LOAD_TARGET_LCD_V
*/
/*
*/
/* FT_LOAD_TARGET_MODE
*/
/*
*/
/* FT_Render_Glyph
*/
/* FT_Render_Mode
*/
/* FT_Get_Kerning
*/
/* FT_Kerning_Mode
*/
/* FT_Get_Track_Kerning
*/
/* FT_Get_Glyph_Name
*/
/* FT_Get_Postscript_Name
*/
/*
*/
/* FT_CharMapRec
*/
/* FT_Select_Charmap
*/
/* FT_Set_Charmap
*/
/* FT_Get_Charmap_Index
*/
/*
*/
/* FT_Get_FSType_Flags
*/
/* FT_Get_SubGlyph_Info
*/
/*
*/
/* FT_Face_Internal
*/
/* FT_Size_Internal
*/
/* FT_Slot_Internal
*/
/*
*/
/* FT_FACE_FLAG_XXX
*/
/* FT_STYLE_FLAG_XXX
*/
/* FT_OPEN_XXX
*/
/* FT_LOAD_XXX
*/
/* FT_LOAD_TARGET_XXX
*/
/* FT_SUBGLYPH_FLAG_XXX
*/
/* FT_FSTYPE_XXX
*/
/*
*/
/* FT_HAS_FAST_GLYPHS
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Glyph_Metrics
*/
/*
*/
/* <Description>
*/
/* A structure to model the metrics of a single glyph. The values
*/
/* are expressed in 26.6 fractional pixel format; if the flag
*/
/* @FT_LOAD_NO_SCALE has been used while loading the glyph, values
*/
/* are expressed in font units instead.
*/
/*
*/
/* <Fields>
*/
/* width ::
*/
/* The glyph's width.
*/
/*
*/
/* height ::
*/
/* The glyph's height.
*/
/*
*/
/* horiBearingX ::
*/
/* Left side bearing for horizontal layout.
*/
/*
*/
/* horiBearingY ::
*/
/* Top side bearing for horizontal layout.
*/
/*
*/
/* horiAdvance ::
*/
/* Advance width for horizontal layout.
*/
/*
*/
/* vertBearingX ::
*/
/* Left side bearing for vertical layout.
*/
/*
*/
/* vertBearingY ::
*/
/* Top side bearing for vertical layout. Larger positive values
*/
/* mean further below the vertical glyph origin.
*/
/*
*/
/* vertAdvance ::
*/
/* Advance height for vertical layout. Positive values mean the
*/
/* glyph has a positive advance downward.
*/
/*
*/
/* <Note>
*/
/* If not disabled with @FT_LOAD_NO_HINTING, the values represent
*/
/* dimensions of the hinted glyph (in case hinting is applicable).
*/
/*
*/
/* Stroking a glyph with an outside border does not increase
*/
/* `horiAdvance' or `vertAdvance'; you have to manually
adjust these */
/* values to account for the added width and height.
*/
/*
*/
/* FreeType doesn't use the `VORG' table data for CFF fonts
because */
/* it doesn't have an interface to quickly retrieve the glyph
height. */
/* The y~coordinate of the vertical origin can be simply computed as
*/
/* `vertBearingY + height' after loading a glyph.
*/
/*
*/
typedef struct FT_Glyph_Metrics_
{
FT_Pos width;
FT_Pos height;
FT_Pos horiBearingX;
FT_Pos horiBearingY;
FT_Pos horiAdvance;
FT_Pos vertBearingX;
FT_Pos vertBearingY;
FT_Pos vertAdvance;
} FT_Glyph_Metrics;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Bitmap_Size
*/
/*
*/
/* <Description>
*/
/* This structure models the metrics of a bitmap strike (i.e., a set
*/
/* of glyphs for a given point size and resolution) in a bitmap font.
*/
/* It is used for the `available_sizes' field of @FT_Face.
*/
/*
*/
/* <Fields>
*/
/* height :: The vertical distance, in pixels, between two
*/
/* consecutive baselines. It is always positive.
*/
/*
*/
/* width :: The average width, in pixels, of all glyphs in the
*/
/* strike.
*/
/*
*/
/* size :: The nominal size of the strike in 26.6 fractional
*/
/* points. This field is not very useful.
*/
/*
*/
/* x_ppem :: The horizontal ppem (nominal width) in 26.6 fractional
*/
/* pixels.
*/
/*
*/
/* y_ppem :: The vertical ppem (nominal height) in 26.6 fractional
*/
/* pixels.
*/
/*
*/
/* <Note>
*/
/* Windows FNT:
*/
/* The nominal size given in a FNT font is not reliable. If the
*/
/* driver finds it incorrect, it sets `size' to some calculated
*/
/* values, and `x_ppem' and `y_ppem' to the pixel width
and height */
/* given in the font, respectively.
*/
/*
*/
/* TrueType embedded bitmaps:
*/
/* `size', `width', and `height' values are not
contained in the */
/* bitmap strike itself. They are computed from the global font
*/
/* parameters.
*/
/*
*/
typedef struct FT_Bitmap_Size_
{
FT_Short height;
FT_Short width;
FT_Pos size;
FT_Pos x_ppem;
FT_Pos y_ppem;
} FT_Bitmap_Size;
/*************************************************************************/
/*************************************************************************/
/*
*/
/* O B J E C T C L A S S E S
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Library
*/
/*
*/
/* <Description>
*/
/* A handle to a FreeType library instance. Each `library' is
*/
/* completely independent from the others; it is the `root' of a
set */
/* of objects like fonts, faces, sizes, etc.
*/
/*
*/
/* It also embeds a memory manager (see @FT_Memory), as well as a
*/
/* scan-line converter object (see @FT_Raster).
*/
/*
*/
/* In multi-threaded applications it is easiest to use one
*/
/* `FT_Library' object per thread. In case this is too
cumbersome, */
/* a single `FT_Library' object across threads is possible also
*/
/* (since FreeType version 2.5.6), as long as a mutex lock is used
*/
/* around @FT_New_Face and @FT_Done_Face.
*/
/*
*/
/* <Note>
*/
/* Library objects are normally created by @FT_Init_FreeType, and
*/
/* destroyed with @FT_Done_FreeType. If you need reference-counting
*/
/* (cf. @FT_Reference_Library), use @FT_New_Library and
*/
/* @FT_Done_Library.
*/
/*
*/
typedef struct FT_LibraryRec_ *FT_Library;
/*************************************************************************/
/*
*/
/* <Section>
*/
/* module_management
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Module
*/
/*
*/
/* <Description>
*/
/* A handle to a given FreeType module object. A module can be a
*/
/* font driver, a renderer, or anything else that provides services
*/
/* to the former.
*/
/*
*/
typedef struct FT_ModuleRec_* FT_Module;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Driver
*/
/*
*/
/* <Description>
*/
/* A handle to a given FreeType font driver object. A font driver
*/
/* is a module capable of creating faces from font files.
*/
/*
*/
typedef struct FT_DriverRec_* FT_Driver;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Renderer
*/
/*
*/
/* <Description>
*/
/* A handle to a given FreeType renderer. A renderer is a module in
*/
/* charge of converting a glyph's outline image to a bitmap. It
*/
/* supports a single glyph image format, and one or more target
*/
/* surface depths.
*/
/*
*/
typedef struct FT_RendererRec_* FT_Renderer;
/*************************************************************************/
/*
*/
/* <Section>
*/
/* base_interface
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Face
*/
/*
*/
/* <Description>
*/
/* A handle to a typographic face object. A face object models a
*/
/* given typeface, in a given style.
*/
/*
*/
/* <Note>
*/
/* A face object also owns a single @FT_GlyphSlot object, as well
*/
/* as one or more @FT_Size objects.
*/
/*
*/
/* Use @FT_New_Face or @FT_Open_Face to create a new face object from
*/
/* a given filepath or a custom input stream.
*/
/*
*/
/* Use @FT_Done_Face to destroy it (along with its slot and sizes).
*/
/*
*/
/* An `FT_Face' object can only be safely used from one thread at
a */
/* time. Similarly, creation and destruction of `FT_Face' with
the */
/* same @FT_Library object can only be done from one thread at a
*/
/* time. On the other hand, functions like @FT_Load_Glyph and its
*/
/* siblings are thread-safe and do not need the lock to be held as
*/
/* long as the same `FT_Face' object is not used from multiple
*/
/* threads at the same time.
*/
/*
*/
/* <Also>
*/
/* See @FT_FaceRec for the publicly accessible fields of a given face
*/
/* object.
*/
/*
*/
typedef struct FT_FaceRec_* FT_Face;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Size
*/
/*
*/
/* <Description>
*/
/* A handle to an object that models a face scaled to a given
*/
/* character size.
*/
/*
*/
/* <Note>
*/
/* An @FT_Face has one _active_ @FT_Size object that is used by
*/
/* functions like @FT_Load_Glyph to determine the scaling
*/
/* transformation that in turn is used to load and hint glyphs and
*/
/* metrics.
*/
/*
*/
/* You can use @FT_Set_Char_Size, @FT_Set_Pixel_Sizes,
*/
/* @FT_Request_Size or even @FT_Select_Size to change the content
*/
/* (i.e., the scaling values) of the active @FT_Size.
*/
/*
*/
/* You can use @FT_New_Size to create additional size objects for a
*/
/* given @FT_Face, but they won't be used by other functions
until */
/* you activate it through @FT_Activate_Size. Only one size can be
*/
/* activated at any given time per face.
*/
/*
*/
/* <Also>
*/
/* See @FT_SizeRec for the publicly accessible fields of a given size
*/
/* object.
*/
/*
*/
typedef struct FT_SizeRec_* FT_Size;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_GlyphSlot
*/
/*
*/
/* <Description>
*/
/* A handle to a given `glyph slot'. A slot is a container that
can */
/* hold any of the glyphs contained in its parent face.
*/
/*
*/
/* In other words, each time you call @FT_Load_Glyph or
*/
/* @FT_Load_Char, the slot's content is erased by the new glyph
data, */
/* i.e., the glyph's metrics, its image (bitmap or outline), and
*/
/* other control information.
*/
/*
*/
/* <Also>
*/
/* See @FT_GlyphSlotRec for the publicly accessible glyph fields.
*/
/*
*/
typedef struct FT_GlyphSlotRec_* FT_GlyphSlot;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_CharMap
*/
/*
*/
/* <Description>
*/
/* A handle to a character map (usually abbreviated to
`charmap'). A */
/* charmap is used to translate character codes in a given encoding
*/
/* into glyph indexes for its parent's face. Some font formats
may */
/* provide several charmaps per font.
*/
/*
*/
/* Each face object owns zero or more charmaps, but only one of them
*/
/* can be `active', providing the data used by @FT_Get_Char_Index
or */
/* @FT_Load_Char.
*/
/*
*/
/* The list of available charmaps in a face is available through the
*/
/* `face->num_charmaps' and `face->charmaps' fields of
@FT_FaceRec. */
/*
*/
/* The currently active charmap is available as
`face->charmap'. */
/* You should call @FT_Set_Charmap to change it.
*/
/*
*/
/* <Note>
*/
/* When a new face is created (either through @FT_New_Face or
*/
/* @FT_Open_Face), the library looks for a Unicode charmap within
*/
/* the list and automatically activates it.
*/
/*
*/
/* <Also>
*/
/* See @FT_CharMapRec for the publicly accessible fields of a given
*/
/* character map.
*/
/*
*/
typedef struct FT_CharMapRec_* FT_CharMap;
/*************************************************************************/
/*
*/
/* <Macro>
*/
/* FT_ENC_TAG
*/
/*
*/
/* <Description>
*/
/* This macro converts four-letter tags into an unsigned long. It is
*/
/* used to define `encoding' identifiers (see @FT_Encoding).
*/
/*
*/
/* <Note>
*/
/* Since many 16-bit compilers don't like 32-bit enumerations,
you */
/* should redefine this macro in case of problems to something like
*/
/* this:
*/
/*
*/
/* {
*/
/* #define FT_ENC_TAG( value, a, b, c, d ) value
*/
/* }
*/
/*
*/
/* to get a simple enumeration without assigning special numbers.
*/
/*
*/
#ifndef FT_ENC_TAG
#define FT_ENC_TAG( value, a, b, c, d ) \
value = ( ( (FT_UInt32)(a) << 24 ) | \
( (FT_UInt32)(b) << 16 ) | \
( (FT_UInt32)(c) << 8 ) | \
(FT_UInt32)(d) )
#endif /* FT_ENC_TAG */
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_Encoding
*/
/*
*/
/* <Description>
*/
/* An enumeration to specify character sets supported by charmaps.
*/
/* Used in the @FT_Select_Charmap API function.
*/
/*
*/
/* <Note>
*/
/* Despite the name, this enumeration lists specific character
*/
/* repertories (i.e., charsets), and not text encoding methods (e.g.,
*/
/* UTF-8, UTF-16, etc.).
*/
/*
*/
/* Other encodings might be defined in the future.
*/
/*
*/
/* <Values>
*/
/* FT_ENCODING_NONE ::
*/
/* The encoding value~0 is reserved.
*/
/*
*/
/* FT_ENCODING_UNICODE ::
*/
/* The Unicode character set. This value covers all versions of
*/
/* the Unicode repertoire, including ASCII and Latin-1. Most fonts
*/
/* include a Unicode charmap, but not all of them.
*/
/*
*/
/* For example, if you want to access Unicode value U+1F028 (and
*/
/* the font contains it), use value 0x1F028 as the input value for
*/
/* @FT_Get_Char_Index.
*/
/*
*/
/* FT_ENCODING_MS_SYMBOL ::
*/
/* Microsoft Symbol encoding, used to encode mathematical symbols
*/
/* and wingdings. For more information, see
*/
/* `http://www.microsoft.com/typography/otspec/recom.htm',
*/
/* `http://www.kostis.net/charsets/symbol.htm', and
*/
/* `http://www.kostis.net/charsets/wingding.htm'.
*/
/*
*/
/* This encoding uses character codes from the PUA (Private Unicode
*/
/* Area) in the range U+F020-U+F0FF.
*/
/*
*/
/* FT_ENCODING_SJIS ::
*/
/* Shift JIS encoding for Japanese. More info at
*/
/* `http://en.wikipedia.org/wiki/Shift_JIS'. See note on
*/
/* multi-byte encodings below.
*/
/*
*/
/* FT_ENCODING_PRC ::
*/
/* Corresponds to encoding systems mainly for Simplified Chinese as
*/
/* used in People's Republic of China (PRC). The encoding
layout */
/* is based on GB~2312 and its supersets GBK and GB~18030.
*/
/*
*/
/* FT_ENCODING_BIG5 ::
*/
/* Corresponds to an encoding system for Traditional Chinese as
*/
/* used in Taiwan and Hong Kong.
*/
/*
*/
/* FT_ENCODING_WANSUNG ::
*/
/* Corresponds to the Korean encoding system known as Extended
*/
/* Wansung (MS Windows code page 949).
*/
/* For more information see
*/
/*
`http://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit949.txt'.
*/
/*
*/
/* FT_ENCODING_JOHAB ::
*/
/* The Korean standard character set (KS~C 5601-1992), which
*/
/* corresponds to MS Windows code page 1361. This character set
*/
/* includes all possible Hangul character combinations.
*/
/*
*/
/* FT_ENCODING_ADOBE_LATIN_1 ::
*/
/* Corresponds to a Latin-1 encoding as defined in a Type~1
*/
/* PostScript font. It is limited to 256 character codes.
*/
/*
*/
/* FT_ENCODING_ADOBE_STANDARD ::
*/
/* Adobe Standard encoding, as found in Type~1, CFF, and
*/
/* OpenType/CFF fonts. It is limited to 256 character codes.
*/
/*
*/
/* FT_ENCODING_ADOBE_EXPERT ::
*/
/* Adobe Expert encoding, as found in Type~1, CFF, and OpenType/CFF
*/
/* fonts. It is limited to 256 character codes.
*/
/*
*/
/* FT_ENCODING_ADOBE_CUSTOM ::
*/
/* Corresponds to a custom encoding, as found in Type~1, CFF, and
*/
/* OpenType/CFF fonts. It is limited to 256 character codes.
*/
/*
*/
/* FT_ENCODING_APPLE_ROMAN ::
*/
/* Apple roman encoding. Many TrueType and OpenType fonts contain
*/
/* a charmap for this 8-bit encoding, since older versions of Mac
*/
/* OS are able to use it.
*/
/*
*/
/* FT_ENCODING_OLD_LATIN_2 ::
*/
/* This value is deprecated and was neither used nor reported by
*/
/* FreeType. Don't use or test for it.
*/
/*
*/
/* FT_ENCODING_MS_SJIS ::
*/
/* Same as FT_ENCODING_SJIS. Deprecated.
*/
/*
*/
/* FT_ENCODING_MS_GB2312 ::
*/
/* Same as FT_ENCODING_PRC. Deprecated.
*/
/*
*/
/* FT_ENCODING_MS_BIG5 ::
*/
/* Same as FT_ENCODING_BIG5. Deprecated.
*/
/*
*/
/* FT_ENCODING_MS_WANSUNG ::
*/
/* Same as FT_ENCODING_WANSUNG. Deprecated.
*/
/*
*/
/* FT_ENCODING_MS_JOHAB ::
*/
/* Same as FT_ENCODING_JOHAB. Deprecated.
*/
/*
*/
/* <Note>
*/
/* By default, FreeType automatically synthesizes a Unicode charmap
*/
/* for PostScript fonts, using their glyph name dictionaries.
*/
/* However, it also reports the encodings defined explicitly in the
*/
/* font file, for the cases when they are needed, with the Adobe
*/
/* values as well.
*/
/*
*/
/* FT_ENCODING_NONE is set by the BDF and PCF drivers if the charmap
*/
/* is neither Unicode nor ISO-8859-1 (otherwise it is set to
*/
/* FT_ENCODING_UNICODE). Use @FT_Get_BDF_Charset_ID to find out
*/
/* which encoding is really present. If, for example, the
*/
/* `cs_registry' field is `KOI8' and the `cs_encoding'
field is `R', */
/* the font is encoded in KOI8-R.
*/
/*
*/
/* FT_ENCODING_NONE is always set (with a single exception) by the
*/
/* winfonts driver. Use @FT_Get_WinFNT_Header and examine the
*/
/* `charset' field of the @FT_WinFNT_HeaderRec structure to find
out */
/* which encoding is really present. For example,
*/
/* @FT_WinFNT_ID_CP1251 (204) means Windows code page 1251 (for
*/
/* Russian).
*/
/*
*/
/* FT_ENCODING_NONE is set if `platform_id' is
@TT_PLATFORM_MACINTOSH */
/* and `encoding_id' is not `TT_MAC_ID_ROMAN' (otherwise it
is set to */
/* FT_ENCODING_APPLE_ROMAN).
*/
/*
*/
/* If `platform_id' is @TT_PLATFORM_MACINTOSH, use the function
*/
/* @FT_Get_CMap_Language_ID to query the Mac language ID that may
*/
/* be needed to be able to distinguish Apple encoding variants. See
*/
/*
*/
/* http://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/Readme.txt
*/
/*
*/
/* to get an idea how to do that. Basically, if the language ID
*/
/* is~0, don't use it, otherwise subtract 1 from the language ID.
*/
/* Then examine `encoding_id'. If, for example,
`encoding_id' is */
/* `TT_MAC_ID_ROMAN' and the language ID (minus~1) is
*/
/* `TT_MAC_LANGID_GREEK', it is the Greek encoding, not Roman.
*/
/* `TT_MAC_ID_ARABIC' with `TT_MAC_LANGID_FARSI' means the
Farsi */
/* variant the Arabic encoding.
*/
/*
*/
typedef enum FT_Encoding_
{
FT_ENC_TAG( FT_ENCODING_NONE, 0, 0, 0, 0 ),
FT_ENC_TAG( FT_ENCODING_MS_SYMBOL, 's', 'y',
'm', 'b' ),
FT_ENC_TAG( FT_ENCODING_UNICODE, 'u', 'n',
'i', 'c' ),
FT_ENC_TAG( FT_ENCODING_SJIS, 's', 'j',
'i', 's' ),
FT_ENC_TAG( FT_ENCODING_GB2312, 'g', 'b', '
', ' ' ),
FT_ENC_TAG( FT_ENCODING_BIG5, 'b', 'i',
'g', '5' ),
FT_ENC_TAG( FT_ENCODING_WANSUNG, 'w', 'a',
'n', 's' ),
FT_ENC_TAG( FT_ENCODING_JOHAB, 'j', 'o',
'h', 'a' ),
/* for backward compatibility */
FT_ENCODING_MS_SJIS = FT_ENCODING_SJIS,
FT_ENCODING_MS_GB2312 = FT_ENCODING_GB2312,
FT_ENCODING_MS_BIG5 = FT_ENCODING_BIG5,
FT_ENCODING_MS_WANSUNG = FT_ENCODING_WANSUNG,
FT_ENCODING_MS_JOHAB = FT_ENCODING_JOHAB,
FT_ENC_TAG( FT_ENCODING_ADOBE_STANDARD, 'A', 'D',
'O', 'B' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_EXPERT, 'A', 'D',
'B', 'E' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_CUSTOM, 'A', 'D',
'B', 'C' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_LATIN_1, 'l', 'a',
't', '1' ),
FT_ENC_TAG( FT_ENCODING_OLD_LATIN_2, 'l', 'a',
't', '2' ),
FT_ENC_TAG( FT_ENCODING_APPLE_ROMAN, 'a', 'r',
'm', 'n' )
} FT_Encoding;
/* these constants are deprecated; use the corresponding
`FT_Encoding' */
/* values instead */
#define ft_encoding_none FT_ENCODING_NONE
#define ft_encoding_unicode FT_ENCODING_UNICODE
#define ft_encoding_symbol FT_ENCODING_MS_SYMBOL
#define ft_encoding_latin_1 FT_ENCODING_ADOBE_LATIN_1
#define ft_encoding_latin_2 FT_ENCODING_OLD_LATIN_2
#define ft_encoding_sjis FT_ENCODING_SJIS
#define ft_encoding_gb2312 FT_ENCODING_GB2312
#define ft_encoding_big5 FT_ENCODING_BIG5
#define ft_encoding_wansung FT_ENCODING_WANSUNG
#define ft_encoding_johab FT_ENCODING_JOHAB
#define ft_encoding_adobe_standard FT_ENCODING_ADOBE_STANDARD
#define ft_encoding_adobe_expert FT_ENCODING_ADOBE_EXPERT
#define ft_encoding_adobe_custom FT_ENCODING_ADOBE_CUSTOM
#define ft_encoding_apple_roman FT_ENCODING_APPLE_ROMAN
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_CharMapRec
*/
/*
*/
/* <Description>
*/
/* The base charmap structure.
*/
/*
*/
/* <Fields>
*/
/* face :: A handle to the parent face object.
*/
/*
*/
/* encoding :: An @FT_Encoding tag identifying the charmap. Use
*/
/* this with @FT_Select_Charmap.
*/
/*
*/
/* platform_id :: An ID number describing the platform for the
*/
/* following encoding ID. This comes directly from
*/
/* the TrueType specification and gets emulated for
*/
/* other formats.
*/
/*
*/
/* encoding_id :: A platform specific encoding number. This also
*/
/* comes from the TrueType specification and gets
*/
/* emulated similarly.
*/
/*
*/
typedef struct FT_CharMapRec_
{
FT_Face face;
FT_Encoding encoding;
FT_UShort platform_id;
FT_UShort encoding_id;
} FT_CharMapRec;
/*************************************************************************/
/*************************************************************************/
/*
*/
/* B A S E O B J E C T C L A S S E S
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Face_Internal
*/
/*
*/
/* <Description>
*/
/* An opaque handle to an `FT_Face_InternalRec' structure that
models */
/* the private data of a given @FT_Face object.
*/
/*
*/
/* This structure might change between releases of FreeType~2 and is
*/
/* not generally available to client applications.
*/
/*
*/
typedef struct FT_Face_InternalRec_* FT_Face_Internal;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_FaceRec
*/
/*
*/
/* <Description>
*/
/* FreeType root face class structure. A face object models a
*/
/* typeface in a font file.
*/
/*
*/
/* <Fields>
*/
/* num_faces :: The number of faces in the font file. Some
*/
/* font formats can have multiple faces in
*/
/* a single font file.
*/
/*
*/
/* face_index :: This field holds two different values.
*/
/* Bits 0-15 are the index of the face in the
*/
/* font file (starting with value~0). They
*/
/* are set to~0 if there is only one face in
*/
/* the font file.
*/
/*
*/
/* Bits 16-30 are relevant to GX and OpenType
*/
/* variation fonts only, holding the named
*/
/* instance index for the current face index
*/
/* (starting with value~1; value~0 indicates
*/
/* font access without a named instance). For
*/
/* non-variation fonts, bits 16-30 are
*/
/* ignored. If we have the third named
*/
/* instance of face~4, say, `face_index'
is */
/* set to 0x00030004.
*/
/*
*/
/* Bit 31 is always zero (this is,
*/
/* `face_index' is always a positive
value). */
/*
*/
/* face_flags :: A set of bit flags that give important
*/
/* information about the face; see
*/
/* @FT_FACE_FLAG_XXX for the details.
*/
/*
*/
/* style_flags :: The lower 16~bits contain a set of bit
*/
/* flags indicating the style of the face; see
*/
/* @FT_STYLE_FLAG_XXX for the details. Bits
*/
/* 16-30 hold the number of named instances
*/
/* available for the current face if we have a
*/
/* GX or OpenType variation (sub)font. Bit 31
*/
/* is always zero (this is, `style_flags'
is */
/* always a positive value). Note that a
*/
/* variation font has always at least one
*/
/* named instance, namely the default
*/
/* instance.
*/
/*
*/
/* num_glyphs :: The number of glyphs in the face. If the
*/
/* face is scalable and has sbits (see
*/
/* `num_fixed_sizes'), it is set to the
number */
/* of outline glyphs.
*/
/*
*/
/* For CID-keyed fonts (not in an SFNT
*/
/* wrapper) this value gives the highest CID
*/
/* used in the font.
*/
/*
*/
/* family_name :: The face's family name. This is an
ASCII */
/* string, usually in English, that describes
*/
/* the typeface's family (like `Times New
*/
/* Roman', `Bodoni', `Garamond',
etc). This */
/* is a least common denominator used to list
*/
/* fonts. Some formats (TrueType &
OpenType) */
/* provide localized and Unicode versions of
*/
/* this string. Applications should use the
*/
/* format specific interface to access them.
*/
/* Can be NULL (e.g., in fonts embedded in a
*/
/* PDF file).
*/
/*
*/
/* In case the font doesn't provide a
specific */
/* family name entry, FreeType tries to
*/
/* synthesize one, deriving it from other name
*/
/* entries.
*/
/*
*/
/* style_name :: The face's style name. This is an
ASCII */
/* string, usually in English, that describes
*/
/* the typeface's style (like
`Italic', */
/* `Bold', `Condensed', etc). Not
all font */
/* formats provide a style name, so this field
*/
/* is optional, and can be set to NULL. As
*/
/* for `family_name', some formats provide
*/
/* localized and Unicode versions of this
*/
/* string. Applications should use the format
*/
/* specific interface to access them.
*/
/*
*/
/* num_fixed_sizes :: The number of bitmap strikes in the face.
*/
/* Even if the face is scalable, there might
*/
/* still be bitmap strikes, which are called
*/
/* `sbits' in that case.
*/
/*
*/
/* available_sizes :: An array of @FT_Bitmap_Size for all bitmap
*/
/* strikes in the face. It is set to NULL if
*/
/* there is no bitmap strike.
*/
/*
*/
/* Note that FreeType tries to sanitize the
*/
/* strike data since they are sometimes sloppy
*/
/* or incorrect, but this can easily fail.
*/
/*
*/
/* num_charmaps :: The number of charmaps in the face.
*/
/*
*/
/* charmaps :: An array of the charmaps of the face.
*/
/*
*/
/* generic :: A field reserved for client uses. See the
*/
/* @FT_Generic type description.
*/
/*
*/
/* bbox :: The font bounding box. Coordinates are
*/
/* expressed in font units (see
*/
/* `units_per_EM'). The box is large
enough */
/* to contain any glyph from the font. Thus,
*/
/* `bbox.yMax' can be seen as the `maximum
*/
/* ascender', and `bbox.yMin' as the
`minimum */
/* descender'. Only relevant for scalable
*/
/* formats.
*/
/*
*/
/* Note that the bounding box might be off by
*/
/* (at least) one pixel for hinted fonts. See
*/
/* @FT_Size_Metrics for further discussion.
*/
/*
*/
/* units_per_EM :: The number of font units per EM square for
*/
/* this face. This is typically 2048 for
*/
/* TrueType fonts, and 1000 for Type~1 fonts.
*/
/* Only relevant for scalable formats.
*/
/*
*/
/* ascender :: The typographic ascender of the face,
*/
/* expressed in font units. For font formats
*/
/* not having this information, it is set to
*/
/* `bbox.yMax'. Only relevant for
scalable */
/* formats.
*/
/*
*/
/* descender :: The typographic descender of the face,
*/
/* expressed in font units. For font formats
*/
/* not having this information, it is set to
*/
/* `bbox.yMin'. Note that this field is
*/
/* negative for values below the baseline.
*/
/* Only relevant for scalable formats.
*/
/*
*/
/* height :: This value is the vertical distance
*/
/* between two consecutive baselines,
*/
/* expressed in font units. It is always
*/
/* positive. Only relevant for scalable
*/
/* formats.
*/
/*
*/
/* If you want the global glyph height, use
*/
/* `ascender - descender'.
*/
/*
*/
/* max_advance_width :: The maximum advance width, in font units,
*/
/* for all glyphs in this face. This can be
*/
/* used to make word wrapping computations
*/
/* faster. Only relevant for scalable
*/
/* formats.
*/
/*
*/
/* max_advance_height :: The maximum advance height, in font units,
*/
/* for all glyphs in this face. This is only
*/
/* relevant for vertical layouts, and is set
*/
/* to `height' for fonts that do not
provide */
/* vertical metrics. Only relevant for
*/
/* scalable formats.
*/
/*
*/
/* underline_position :: The position, in font units, of the
*/
/* underline line for this face. It is the
*/
/* center of the underlining stem. Only
*/
/* relevant for scalable formats.
*/
/*
*/
/* underline_thickness :: The thickness, in font units, of the
*/
/* underline for this face. Only relevant for
*/
/* scalable formats.
*/
/*
*/
/* glyph :: The face's associated glyph slot(s).
*/
/*
*/
/* size :: The current active size for this face.
*/
/*
*/
/* charmap :: The current active charmap for this face.
*/
/*
*/
/* <Note>
*/
/* Fields may be changed after a call to @FT_Attach_File or
*/
/* @FT_Attach_Stream.
*/
/*
*/
/* For an OpenType variation font, the values of the following fields
*/
/* can change after a call to @FT_Set_Var_Design_Coordinates (and
*/
/* friends) if the font contains an `MVAR' table:
`ascender', */
/* `descender', `height', `underline_position', and
*/
/* `underline_thickness'.
*/
/*
*/
typedef struct FT_FaceRec_
{
FT_Long num_faces;
FT_Long face_index;
FT_Long face_flags;
FT_Long style_flags;
FT_Long num_glyphs;
FT_String* family_name;
FT_String* style_name;
FT_Int num_fixed_sizes;
FT_Bitmap_Size* available_sizes;
FT_Int num_charmaps;
FT_CharMap* charmaps;
FT_Generic generic;
/*# The following member variables (down to `underline_thickness')
*/
/*# are only relevant to scalable outlines; cf. @FT_Bitmap_Size */
/*# for bitmap fonts. */
FT_BBox bbox;
FT_UShort units_per_EM;
FT_Short ascender;
FT_Short descender;
FT_Short height;
FT_Short max_advance_width;
FT_Short max_advance_height;
FT_Short underline_position;
FT_Short underline_thickness;
FT_GlyphSlot glyph;
FT_Size size;
FT_CharMap charmap;
/*@private begin */
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_ListRec sizes_list;
FT_Generic autohint; /* face-specific auto-hinter data */
void* extensions; /* unused */
FT_Face_Internal internal;
/*@private end */
} FT_FaceRec;
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_FACE_FLAG_XXX
*/
/*
*/
/* <Description>
*/
/* A list of bit flags used in the `face_flags' field of the
*/
/* @FT_FaceRec structure. They inform client applications of
*/
/* properties of the corresponding face.
*/
/*
*/
/* <Values>
*/
/* FT_FACE_FLAG_SCALABLE ::
*/
/* The face contains outline glyphs. Note that a face can contain
*/
/* bitmap strikes also, i.e., a face can have both this flag and
*/
/* @FT_FACE_FLAG_FIXED_SIZES set.
*/
/*
*/
/* FT_FACE_FLAG_FIXED_SIZES ::
*/
/* The face contains bitmap strikes. See also the
*/
/* `num_fixed_sizes' and `available_sizes' fields of
@FT_FaceRec. */
/*
*/
/* FT_FACE_FLAG_FIXED_WIDTH ::
*/
/* The face contains fixed-width characters (like Courier, Lucida,
*/
/* MonoType, etc.).
*/
/*
*/
/* FT_FACE_FLAG_SFNT ::
*/
/* The face uses the SFNT storage scheme. For now, this means
*/
/* TrueType and OpenType.
*/
/*
*/
/* FT_FACE_FLAG_HORIZONTAL ::
*/
/* The face contains horizontal glyph metrics. This should be set
*/
/* for all common formats.
*/
/*
*/
/* FT_FACE_FLAG_VERTICAL ::
*/
/* The face contains vertical glyph metrics. This is only
*/
/* available in some formats, not all of them.
*/
/*
*/
/* FT_FACE_FLAG_KERNING ::
*/
/* The face contains kerning information. If set, the kerning
*/
/* distance can be retrieved using the function @FT_Get_Kerning.
*/
/* Otherwise the function always return the vector (0,0). Note
*/
/* that FreeType doesn't handle kerning data from the SFNT
`GPOS' */
/* table (as present in many OpenType fonts).
*/
/*
*/
/* FT_FACE_FLAG_FAST_GLYPHS ::
*/
/* THIS FLAG IS DEPRECATED. DO NOT USE OR TEST IT.
*/
/*
*/
/* FT_FACE_FLAG_MULTIPLE_MASTERS ::
*/
/* The face contains multiple masters and is capable of
*/
/* interpolating between them. Supported formats are Adobe MM,
*/
/* TrueType GX, and OpenType variation fonts.
*/
/*
*/
/* See the multiple-masters specific API for details.
*/
/*
*/
/* FT_FACE_FLAG_GLYPH_NAMES ::
*/
/* The face contains glyph names, which can be retrieved using
*/
/* @FT_Get_Glyph_Name. Note that some TrueType fonts contain
*/
/* broken glyph name tables. Use the function
*/
/* @FT_Has_PS_Glyph_Names when needed.
*/
/*
*/
/* FT_FACE_FLAG_EXTERNAL_STREAM ::
*/
/* Used internally by FreeType to indicate that a face's stream
was */
/* provided by the client application and should not be destroyed
*/
/* when @FT_Done_Face is called. Don't read or test this flag.
*/
/*
*/
/* FT_FACE_FLAG_HINTER ::
*/
/* The font driver has a hinting machine of its own. For example,
*/
/* with TrueType fonts, it makes sense to use data from the SFNT
*/
/* `gasp' table only if the native TrueType hinting engine
(with */
/* the bytecode interpreter) is available and active.
*/
/*
*/
/* FT_FACE_FLAG_CID_KEYED ::
*/
/* The face is CID-keyed. In that case, the face is not accessed
*/
/* by glyph indices but by CID values. For subsetted CID-keyed
*/
/* fonts this has the consequence that not all index values are a
*/
/* valid argument to @FT_Load_Glyph. Only the CID values for which
*/
/* corresponding glyphs in the subsetted font exist make
*/
/* `FT_Load_Glyph' return successfully; in all other cases you
get */
/* an `FT_Err_Invalid_Argument' error.
*/
/*
*/
/* Note that CID-keyed fonts that are in an SFNT wrapper (this is,
*/
/* all OpenType/CFF fonts) don't have this flag set since the
*/
/* glyphs are accessed in the normal way (using contiguous
*/
/* indices); the `CID-ness' isn't visible to the
application. */
/*
*/
/* FT_FACE_FLAG_TRICKY ::
*/
/* The face is `tricky', this is, it always needs the font
format's */
/* native hinting engine to get a reasonable result. A typical
*/
/* example is the old Chinese font `mingli.ttf' (but not
*/
/* `mingliu.ttc') that uses TrueType bytecode instructions to
move */
/* and scale all of its subglyphs.
*/
/*
*/
/* It is not possible to auto-hint such fonts using
*/
/* @FT_LOAD_FORCE_AUTOHINT; it will also ignore
*/
/* @FT_LOAD_NO_HINTING. You have to set both @FT_LOAD_NO_HINTING
*/
/* and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you
*/
/* probably never want this except for demonstration purposes.
*/
/*
*/
/* Currently, there are about a dozen TrueType fonts in the list of
*/
/* tricky fonts; they are hard-coded in file `ttobjs.c'.
*/
/*
*/
/* FT_FACE_FLAG_COLOR ::
*/
/* The face has color glyph tables. To access color glyphs use
*/
/* @FT_LOAD_COLOR.
*/
/*
*/
#define FT_FACE_FLAG_SCALABLE ( 1L << 0 )
#define FT_FACE_FLAG_FIXED_SIZES ( 1L << 1 )
#define FT_FACE_FLAG_FIXED_WIDTH ( 1L << 2 )
#define FT_FACE_FLAG_SFNT ( 1L << 3 )
#define FT_FACE_FLAG_HORIZONTAL ( 1L << 4 )
#define FT_FACE_FLAG_VERTICAL ( 1L << 5 )
#define FT_FACE_FLAG_KERNING ( 1L << 6 )
#define FT_FACE_FLAG_FAST_GLYPHS ( 1L << 7 )
#define FT_FACE_FLAG_MULTIPLE_MASTERS ( 1L << 8 )
#define FT_FACE_FLAG_GLYPH_NAMES ( 1L << 9 )
#define FT_FACE_FLAG_EXTERNAL_STREAM ( 1L << 10 )
#define FT_FACE_FLAG_HINTER ( 1L << 11 )
#define FT_FACE_FLAG_CID_KEYED ( 1L << 12 )
#define FT_FACE_FLAG_TRICKY ( 1L << 13 )
#define FT_FACE_FLAG_COLOR ( 1L << 14 )
/*************************************************************************
*
* @macro:
* FT_HAS_HORIZONTAL( face )
*
* @description:
* A macro that returns true whenever a face object contains
* horizontal metrics (this is true for all font formats though).
*
* @also:
* @FT_HAS_VERTICAL can be used to check for vertical metrics.
*
*/
#define FT_HAS_HORIZONTAL( face ) \
( (face)->face_flags & FT_FACE_FLAG_HORIZONTAL )
/*************************************************************************
*
* @macro:
* FT_HAS_VERTICAL( face )
*
* @description:
* A macro that returns true whenever a face object contains real
* vertical metrics (and not only synthesized ones).
*
*/
#define FT_HAS_VERTICAL( face ) \
( (face)->face_flags & FT_FACE_FLAG_VERTICAL )
/*************************************************************************
*
* @macro:
* FT_HAS_KERNING( face )
*
* @description:
* A macro that returns true whenever a face object contains kerning
* data that can be accessed with @FT_Get_Kerning.
*
*/
#define FT_HAS_KERNING( face ) \
( (face)->face_flags & FT_FACE_FLAG_KERNING )
/*************************************************************************
*
* @macro:
* FT_IS_SCALABLE( face )
*
* @description:
* A macro that returns true whenever a face object contains a scalable
* font face (true for TrueType, Type~1, Type~42, CID, OpenType/CFF,
* and PFR font formats).
*
*/
#define FT_IS_SCALABLE( face ) \
( (face)->face_flags & FT_FACE_FLAG_SCALABLE )
/*************************************************************************
*
* @macro:
* FT_IS_SFNT( face )
*
* @description:
* A macro that returns true whenever a face object contains a font
* whose format is based on the SFNT storage scheme. This usually
* means: TrueType fonts, OpenType fonts, as well as SFNT-based
embedded
* bitmap fonts.
*
* If this macro is true, all functions defined in @FT_SFNT_NAMES_H and
* @FT_TRUETYPE_TABLES_H are available.
*
*/
#define FT_IS_SFNT( face ) \
( (face)->face_flags & FT_FACE_FLAG_SFNT )
/*************************************************************************
*
* @macro:
* FT_IS_FIXED_WIDTH( face )
*
* @description:
* A macro that returns true whenever a face object contains a font
face
* that contains fixed-width (or `monospace', `fixed-pitch',
etc.)
* glyphs.
*
*/
#define FT_IS_FIXED_WIDTH( face ) \
( (face)->face_flags & FT_FACE_FLAG_FIXED_WIDTH )
/*************************************************************************
*
* @macro:
* FT_HAS_FIXED_SIZES( face )
*
* @description:
* A macro that returns true whenever a face object contains some
* embedded bitmaps. See the `available_sizes' field of the
* @FT_FaceRec structure.
*
*/
#define FT_HAS_FIXED_SIZES( face ) \
( (face)->face_flags & FT_FACE_FLAG_FIXED_SIZES )
/*************************************************************************
*
* @macro:
* FT_HAS_FAST_GLYPHS( face )
*
* @description:
* Deprecated.
*
*/
#define FT_HAS_FAST_GLYPHS( face ) 0
/*************************************************************************
*
* @macro:
* FT_HAS_GLYPH_NAMES( face )
*
* @description:
* A macro that returns true whenever a face object contains some glyph
* names that can be accessed through @FT_Get_Glyph_Name.
*
*/
#define FT_HAS_GLYPH_NAMES( face ) \
( (face)->face_flags & FT_FACE_FLAG_GLYPH_NAMES )
/*************************************************************************
*
* @macro:
* FT_HAS_MULTIPLE_MASTERS( face )
*
* @description:
* A macro that returns true whenever a face object contains some
* multiple masters. The functions provided by @FT_MULTIPLE_MASTERS_H
* are then available to choose the exact design you want.
*
*/
#define FT_HAS_MULTIPLE_MASTERS( face ) \
( (face)->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS )
/*************************************************************************
*
* @macro:
* FT_IS_NAMED_INSTANCE( face )
*
* @description:
* A macro that returns true whenever a face object is a named instance
* of a GX or OpenType variation font.
*
*/
#define FT_IS_NAMED_INSTANCE( face ) \
( (face)->face_index & 0x7FFF0000L )
/*************************************************************************
*
* @macro:
* FT_IS_CID_KEYED( face )
*
* @description:
* A macro that returns true whenever a face object contains a
CID-keyed
* font. See the discussion of @FT_FACE_FLAG_CID_KEYED for more
* details.
*
* If this macro is true, all functions defined in @FT_CID_H are
* available.
*
*/
#define FT_IS_CID_KEYED( face ) \
( (face)->face_flags & FT_FACE_FLAG_CID_KEYED )
/*************************************************************************
*
* @macro:
* FT_IS_TRICKY( face )
*
* @description:
* A macro that returns true whenever a face represents a `tricky'
font.
* See the discussion of @FT_FACE_FLAG_TRICKY for more details.
*
*/
#define FT_IS_TRICKY( face ) \
( (face)->face_flags & FT_FACE_FLAG_TRICKY )
/*************************************************************************
*
* @macro:
* FT_HAS_COLOR( face )
*
* @description:
* A macro that returns true whenever a face object contains
* tables for color glyphs.
*
*/
#define FT_HAS_COLOR( face ) \
( (face)->face_flags & FT_FACE_FLAG_COLOR )
/*************************************************************************/
/*
*/
/* <Const>
*/
/* FT_STYLE_FLAG_XXX
*/
/*
*/
/* <Description>
*/
/* A list of bit flags to indicate the style of a given face. These
*/
/* are used in the `style_flags' field of @FT_FaceRec.
*/
/*
*/
/* <Values>
*/
/* FT_STYLE_FLAG_ITALIC ::
*/
/* The face style is italic or oblique.
*/
/*
*/
/* FT_STYLE_FLAG_BOLD ::
*/
/* The face is bold.
*/
/*
*/
/* <Note>
*/
/* The style information as provided by FreeType is very basic. More
*/
/* details are beyond the scope and should be done on a higher level
*/
/* (for example, by analyzing various fields of the `OS/2' table
in */
/* SFNT based fonts).
*/
/*
*/
#define FT_STYLE_FLAG_ITALIC ( 1 << 0 )
#define FT_STYLE_FLAG_BOLD ( 1 << 1 )
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Size_Internal
*/
/*
*/
/* <Description>
*/
/* An opaque handle to an `FT_Size_InternalRec' structure, used
to */
/* model private data of a given @FT_Size object.
*/
/*
*/
typedef struct FT_Size_InternalRec_* FT_Size_Internal;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Size_Metrics
*/
/*
*/
/* <Description>
*/
/* The size metrics structure gives the metrics of a size object.
*/
/*
*/
/* <Fields>
*/
/* x_ppem :: The width of the scaled EM square in pixels, hence
*/
/* the term `ppem' (pixels per EM). It is also
*/
/* referred to as `nominal width'.
*/
/*
*/
/* y_ppem :: The height of the scaled EM square in pixels,
*/
/* hence the term `ppem' (pixels per EM). It is
also */
/* referred to as `nominal height'.
*/
/*
*/
/* x_scale :: A 16.16 fractional scaling value to convert
*/
/* horizontal metrics from font units to 26.6
*/
/* fractional pixels. Only relevant for scalable
*/
/* font formats.
*/
/*
*/
/* y_scale :: A 16.16 fractional scaling value to convert
*/
/* vertical metrics from font units to 26.6
*/
/* fractional pixels. Only relevant for scalable
*/
/* font formats.
*/
/*
*/
/* ascender :: The ascender in 26.6 fractional pixels, rounded up
*/
/* to an integer value. See @FT_FaceRec for the
*/
/* details.
*/
/*
*/
/* descender :: The descender in 26.6 fractional pixels, rounded
*/
/* down to an integer value. See @FT_FaceRec for the
*/
/* details.
*/
/*
*/
/* height :: The height in 26.6 fractional pixels, rounded to
*/
/* an integer value. See @FT_FaceRec for the
*/
/* details.
*/
/*
*/
/* max_advance :: The maximum advance width in 26.6 fractional
*/
/* pixels, rounded to an integer value. See
*/
/* @FT_FaceRec for the details.
*/
/*
*/
/* <Note>
*/
/* The scaling values, if relevant, are determined first during a
*/
/* size changing operation. The remaining fields are then set by the
*/
/* driver. For scalable formats, they are usually set to scaled
*/
/* values of the corresponding fields in @FT_FaceRec. Some values
*/
/* like ascender or descender are rounded for historical reasons;
*/
/* more precise values (for outline fonts) can be derived by scaling
*/
/* the corresponding @FT_FaceRec values manually.
*/
/*
*/
/* Note that due to glyph hinting and the selected rendering mode
*/
/* these values are usually not exact; consequently, they must be
*/
/* treated as unreliable with an error margin of at least one pixel!
*/
/*
*/
/* Indeed, the only way to get the exact metrics is to render _all_
*/
/* glyphs. As this would be a definite performance hit, it is up to
*/
/* client applications to perform such computations.
*/
/*
*/
/* The `FT_Size_Metrics' structure is valid for bitmap fonts
also. */
/*
*/
typedef struct FT_Size_Metrics_
{
FT_UShort x_ppem; /* horizontal pixels per EM */
FT_UShort y_ppem; /* vertical pixels per EM */
FT_Fixed x_scale; /* scaling values used to convert font */
FT_Fixed y_scale; /* units to 26.6 fractional pixels */
FT_Pos ascender; /* ascender in 26.6 frac. pixels */
FT_Pos descender; /* descender in 26.6 frac. pixels */
FT_Pos height; /* text height in 26.6 frac. pixels */
FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */
} FT_Size_Metrics;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_SizeRec
*/
/*
*/
/* <Description>
*/
/* FreeType root size class structure. A size object models a face
*/
/* object at a given size.
*/
/*
*/
/* <Fields>
*/
/* face :: Handle to the parent face object.
*/
/*
*/
/* generic :: A typeless pointer, unused by the FreeType library or
*/
/* any of its drivers. It can be used by client
*/
/* applications to link their own data to each size
*/
/* object.
*/
/*
*/
/* metrics :: Metrics for this size object. This field is read-only.
*/
/*
*/
typedef struct FT_SizeRec_
{
FT_Face face; /* parent face object */
FT_Generic generic; /* generic pointer for client uses */
FT_Size_Metrics metrics; /* size metrics */
FT_Size_Internal internal;
} FT_SizeRec;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_SubGlyph
*/
/*
*/
/* <Description>
*/
/* The subglyph structure is an internal object used to describe
*/
/* subglyphs (for example, in the case of composites).
*/
/*
*/
/* <Note>
*/
/* The subglyph implementation is not part of the high-level API,
*/
/* hence the forward structure declaration.
*/
/*
*/
/* You can however retrieve subglyph information with
*/
/* @FT_Get_SubGlyph_Info.
*/
/*
*/
typedef struct FT_SubGlyphRec_* FT_SubGlyph;
/*************************************************************************/
/*
*/
/* <Type>
*/
/* FT_Slot_Internal
*/
/*
*/
/* <Description>
*/
/* An opaque handle to an `FT_Slot_InternalRec' structure, used
to */
/* model private data of a given @FT_GlyphSlot object.
*/
/*
*/
typedef struct FT_Slot_InternalRec_* FT_Slot_Internal;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_GlyphSlotRec
*/
/*
*/
/* <Description>
*/
/* FreeType root glyph slot class structure. A glyph slot is a
*/
/* container where individual glyphs can be loaded, be they in
*/
/* outline or bitmap format.
*/
/*
*/
/* <Fields>
*/
/* library :: A handle to the FreeType library instance
*/
/* this slot belongs to.
*/
/*
*/
/* face :: A handle to the parent face object.
*/
/*
*/
/* next :: In some cases (like some font tools), several
*/
/* glyph slots per face object can be a good
*/
/* thing. As this is rare, the glyph slots are
*/
/* listed through a direct, single-linked list
*/
/* using its `next' field.
*/
/*
*/
/* generic :: A typeless pointer unused by the FreeType
*/
/* library or any of its drivers. It can be
*/
/* used by client applications to link their own
*/
/* data to each glyph slot object.
*/
/*
*/
/* metrics :: The metrics of the last loaded glyph in the
*/
/* slot. The returned values depend on the last
*/
/* load flags (see the @FT_Load_Glyph API
*/
/* function) and can be expressed either in 26.6
*/
/* fractional pixels or font units.
*/
/*
*/
/* Note that even when the glyph image is
*/
/* transformed, the metrics are not.
*/
/*
*/
/* linearHoriAdvance :: The advance width of the unhinted glyph.
*/
/* Its value is expressed in 16.16 fractional
*/
/* pixels, unless @FT_LOAD_LINEAR_DESIGN is set
*/
/* when loading the glyph. This field can be
*/
/* important to perform correct WYSIWYG layout.
*/
/* Only relevant for outline glyphs.
*/
/*
*/
/* linearVertAdvance :: The advance height of the unhinted glyph.
*/
/* Its value is expressed in 16.16 fractional
*/
/* pixels, unless @FT_LOAD_LINEAR_DESIGN is set
*/
/* when loading the glyph. This field can be
*/
/* important to perform correct WYSIWYG layout.
*/
/* Only relevant for outline glyphs.
*/
/*
*/
/* advance :: This shorthand is, depending on
*/
/* @FT_LOAD_IGNORE_TRANSFORM, the transformed
*/
/* (hinted) advance width for the glyph, in 26.6
*/
/* fractional pixel format. As specified with
*/
/* @FT_LOAD_VERTICAL_LAYOUT, it uses either the
*/
/* `horiAdvance' or the `vertAdvance'
value of */
/* `metrics' field.
*/
/*
*/
/* format :: This field indicates the format of the image
*/
/* contained in the glyph slot. Typically
*/
/* @FT_GLYPH_FORMAT_BITMAP,
*/
/* @FT_GLYPH_FORMAT_OUTLINE, or
*/
/* @FT_GLYPH_FORMAT_COMPOSITE, but other values
*/
/* are possible.
*/
/*
*/
/* bitmap :: This field is used as a bitmap descriptor
*/
/* when the slot format is
*/
/* @FT_GLYPH_FORMAT_BITMAP. Note that the
*/
/* address and content of the bitmap buffer can
*/
/* change between calls of @FT_Load_Glyph and a
*/
/* few other functions.
*/
/*
*/
/* bitmap_left :: The bitmap's left bearing expressed in
*/
/* integer pixels. Only valid if the format is
*/
/* @FT_GLYPH_FORMAT_BITMAP, this is, if the
*/
/* glyph slot contains a bitmap.
*/
/*
*/
/* bitmap_top :: The bitmap's top bearing expressed in
integer */
/* pixels. This is the distance from the
*/
/* baseline to the top-most glyph scanline,
*/
/* upwards y~coordinates being *positive*.
*/
/*
*/
/* outline :: The outline descriptor for the current glyph
*/
/* image if its format is
*/
/* @FT_GLYPH_FORMAT_OUTLINE. Once a glyph is
*/
/* loaded, `outline' can be transformed,
*/
/* distorted, emboldened, etc. However, it must
*/
/* not be freed.
*/
/*
*/
/* num_subglyphs :: The number of subglyphs in a composite glyph.
*/
/* This field is only valid for the composite
*/
/* glyph format that should normally only be
*/
/* loaded with the @FT_LOAD_NO_RECURSE flag.
*/
/*
*/
/* subglyphs :: An array of subglyph descriptors for
*/
/* composite glyphs. There are
`num_subglyphs' */
/* elements in there. Currently internal to
*/
/* FreeType.
*/
/*
*/
/* control_data :: Certain font drivers can also return the
*/
/* control data for a given glyph image (e.g.
*/
/* TrueType bytecode, Type~1 charstrings, etc.).
*/
/* This field is a pointer to such data; it is
*/
/* currently internal to FreeType.
*/
/*
*/
/* control_len :: This is the length in bytes of the control
*/
/* data. Currently internal to FreeType.
*/
/*
*/
/* other :: Reserved.
*/
/*
*/
/* lsb_delta :: The difference between hinted and unhinted
*/
/* left side bearing while auto-hinting is
*/
/* active. Zero otherwise.
*/
/*
*/
/* rsb_delta :: The difference between hinted and unhinted
*/
/* right side bearing while auto-hinting is
*/
/* active. Zero otherwise.
*/
/*
*/
/* <Note>
*/
/* If @FT_Load_Glyph is called with default flags (see
*/
/* @FT_LOAD_DEFAULT) the glyph image is loaded in the glyph slot in
*/
/* its native format (e.g., an outline glyph for TrueType and Type~1
*/
/* formats).
*/
/*
*/
/* This image can later be converted into a bitmap by calling
*/
/* @FT_Render_Glyph. This function searches the current renderer for
*/
/* the native image's format, then invokes it.
*/
/*
*/
/* The renderer is in charge of transforming the native image through
*/
/* the slot's face transformation fields, then converting it into
a */
/* bitmap that is returned in `slot->bitmap'.
*/
/*
*/
/* Note that `slot->bitmap_left' and
`slot->bitmap_top' are also used */
/* to specify the position of the bitmap relative to the current pen
*/
/* position (e.g., coordinates (0,0) on the baseline). Of course,
*/
/* `slot->format' is also changed to @FT_GLYPH_FORMAT_BITMAP.
*/
/*
*/
/* Here is a small pseudo code fragment that shows how to use
*/
/* `lsb_delta' and `rsb_delta' to do fractional positioning
of */
/* glyphs:
*/
/*
*/
/* {
*/
/* FT_GlyphSlot slot = face->glyph;
*/
/* FT_Pos origin_x = 0;
*/
/*
*/
/*
*/
/* for all glyphs do
*/
/* <load glyph with `FT_Load_Glyph'>
*/
/*
*/
/* FT_Outline_Translate( slot->outline, origin_x & 63, 0 );
*/
/*
*/
/* <save glyph image, or render glyph, or ...>
*/
/*
*/
/* <compute kern between current and next glyph
*/
/* and add it to `origin_x'>
*/
/*
*/
/* origin_x += slot->advance.x;
*/
/* origin_x += slot->rsb_delta - slot->lsb_relta;
*/
/* endfor
*/
/* }
*/
/*
*/
/* Here is another small pseudo code fragment that shows how to use
*/
/* `lsb_delta' and `rsb_delta' to improve integer
positioning of */
/* glyphs:
*/
/*
*/
/* {
*/
/* FT_GlyphSlot slot = face->glyph;
*/
/* FT_Pos origin_x = 0;
*/
/* FT_Pos prev_rsb_delta = 0;
*/
/*
*/
/*
*/
/* for all glyphs do
*/
/* <compute kern between current and previous glyph
*/
/* and add it to `origin_x'>
*/
/*
*/
/* <load glyph with `FT_Load_Glyph'>
*/
/*
*/
/* if ( prev_rsb_delta - slot->lsb_delta >= 32 )
*/
/* origin_x -= 64;
*/
/* else if ( prev_rsb_delta - slot->lsb_delta < -32 )
*/
/* origin_x += 64;
*/
/*
*/
/* prev_rsb_delta = slot->rsb_delta;
*/
/*
*/
/* <save glyph image, or render glyph, or ...>
*/
/*
*/
/* origin_x += slot->advance.x;
*/
/* endfor
*/
/* }
*/
/*
*/
/* If you use strong auto-hinting, you *must* apply these delta
*/
/* values! Otherwise you will experience far too large inter-glyph
*/
/* spacing at small rendering sizes in most cases. Note that it
*/
/* doesn't harm to use the above code for other hinting modes
also, */
/* since the delta values are zero then.
*/
/*
*/
typedef struct FT_GlyphSlotRec_
{
FT_Library library;
FT_Face face;
FT_GlyphSlot next;
FT_UInt reserved; /* retained for binary compatibility
*/
FT_Generic generic;
FT_Glyph_Metrics metrics;
FT_Fixed linearHoriAdvance;
FT_Fixed linearVertAdvance;
FT_Vector advance;
FT_Glyph_Format format;
FT_Bitmap bitmap;
FT_Int bitmap_left;
FT_Int bitmap_top;
FT_Outline outline;
FT_UInt num_subglyphs;
FT_SubGlyph subglyphs;
void* control_data;
long control_len;
FT_Pos lsb_delta;
FT_Pos rsb_delta;
void* other;
FT_Slot_Internal internal;
} FT_GlyphSlotRec;
/*************************************************************************/
/*************************************************************************/
/*
*/
/* F U N C T I O N S
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Init_FreeType
*/
/*
*/
/* <Description>
*/
/* Initialize a new FreeType library object. The set of modules
*/
/* that are registered by this function is determined at build time.
*/
/*
*/
/* <Output>
*/
/* alibrary :: A handle to a new library object.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* In case you want to provide your own memory allocating routines,
*/
/* use @FT_New_Library instead, followed by a call to
*/
/* @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module)
*/
/* and @FT_Set_Default_Properties.
*/
/*
*/
/* See the documentation of @FT_Library and @FT_Face for
*/
/* multi-threading issues.
*/
/*
*/
/* If you need reference-counting (cf. @FT_Reference_Library), use
*/
/* @FT_New_Library and @FT_Done_Library.
*/
/*
*/
/* If compilation option FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES is
*/
/* set, this function reads the `FREETYPE_PROPERTIES' environment
*/
/* variable to control driver properties. See sections @auto_hinter,
*/
/* @cff_driver, @pcf_driver, and @tt_driver for more.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Init_FreeType( FT_Library *alibrary );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Done_FreeType
*/
/*
*/
/* <Description>
*/
/* Destroy a given FreeType library object and all of its children,
*/
/* including resources, drivers, faces, sizes, etc.
*/
/*
*/
/* <Input>
*/
/* library :: A handle to the target library object.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Done_FreeType( FT_Library library );
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_OPEN_XXX
*/
/*
*/
/* <Description>
*/
/* A list of bit field constants used within the `flags' field of
the */
/* @FT_Open_Args structure.
*/
/*
*/
/* <Values>
*/
/* FT_OPEN_MEMORY :: This is a memory-based stream.
*/
/*
*/
/* FT_OPEN_STREAM :: Copy the stream from the `stream' field.
*/
/*
*/
/* FT_OPEN_PATHNAME :: Create a new input stream from a C~path
*/
/* name.
*/
/*
*/
/* FT_OPEN_DRIVER :: Use the `driver' field.
*/
/*
*/
/* FT_OPEN_PARAMS :: Use the `num_params' and `params'
fields. */
/*
*/
/* <Note>
*/
/* The `FT_OPEN_MEMORY', `FT_OPEN_STREAM', and
`FT_OPEN_PATHNAME' */
/* flags are mutually exclusive.
*/
/*
*/
#define FT_OPEN_MEMORY 0x1
#define FT_OPEN_STREAM 0x2
#define FT_OPEN_PATHNAME 0x4
#define FT_OPEN_DRIVER 0x8
#define FT_OPEN_PARAMS 0x10
/* these constants are deprecated; use the corresponding
`FT_OPEN_XXX' */
/* values instead */
#define ft_open_memory FT_OPEN_MEMORY
#define ft_open_stream FT_OPEN_STREAM
#define ft_open_pathname FT_OPEN_PATHNAME
#define ft_open_driver FT_OPEN_DRIVER
#define ft_open_params FT_OPEN_PARAMS
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Parameter
*/
/*
*/
/* <Description>
*/
/* A simple structure to pass more or less generic parameters to
*/
/* @FT_Open_Face and @FT_Face_Properties.
*/
/*
*/
/* <Fields>
*/
/* tag :: A four-byte identification tag.
*/
/*
*/
/* data :: A pointer to the parameter data.
*/
/*
*/
/* <Note>
*/
/* The ID and function of parameters are driver-specific. See the
*/
/* various FT_PARAM_TAG_XXX flags for more information.
*/
/*
*/
typedef struct FT_Parameter_
{
FT_ULong tag;
FT_Pointer data;
} FT_Parameter;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Open_Args
*/
/*
*/
/* <Description>
*/
/* A structure to indicate how to open a new font file or stream. A
*/
/* pointer to such a structure can be used as a parameter for the
*/
/* functions @FT_Open_Face and @FT_Attach_Stream.
*/
/*
*/
/* <Fields>
*/
/* flags :: A set of bit flags indicating how to use the
*/
/* structure.
*/
/*
*/
/* memory_base :: The first byte of the file in memory.
*/
/*
*/
/* memory_size :: The size in bytes of the file in memory.
*/
/*
*/
/* pathname :: A pointer to an 8-bit file pathname.
*/
/*
*/
/* stream :: A handle to a source stream object.
*/
/*
*/
/* driver :: This field is exclusively used by @FT_Open_Face;
*/
/* it simply specifies the font driver to use for
*/
/* opening the face. If set to NULL, FreeType tries
*/
/* to load the face with each one of the drivers in
*/
/* its list.
*/
/*
*/
/* num_params :: The number of extra parameters.
*/
/*
*/
/* params :: Extra parameters passed to the font driver when
*/
/* opening a new face.
*/
/*
*/
/* <Note>
*/
/* The stream type is determined by the contents of `flags' that
*/
/* are tested in the following order by @FT_Open_Face:
*/
/*
*/
/* If the @FT_OPEN_MEMORY bit is set, assume that this is a
*/
/* memory file of `memory_size' bytes, located at
`memory_address'. */
/* The data are not copied, and the client is responsible for
*/
/* releasing and destroying them _after_ the corresponding call to
*/
/* @FT_Done_Face.
*/
/*
*/
/* Otherwise, if the @FT_OPEN_STREAM bit is set, assume that a
*/
/* custom input stream `stream' is used.
*/
/*
*/
/* Otherwise, if the @FT_OPEN_PATHNAME bit is set, assume that this
*/
/* is a normal file and use `pathname' to open it.
*/
/*
*/
/* If the @FT_OPEN_DRIVER bit is set, @FT_Open_Face only tries to
*/
/* open the file with the driver whose handler is in `driver'.
*/
/*
*/
/* If the @FT_OPEN_PARAMS bit is set, the parameters given by
*/
/* `num_params' and `params' is used. They are ignored
otherwise. */
/*
*/
/* Ideally, both the `pathname' and `params' fields should
be tagged */
/* as `const'; this is missing for API backward compatibility.
In */
/* other words, applications should treat them as read-only.
*/
/*
*/
typedef struct FT_Open_Args_
{
FT_UInt flags;
const FT_Byte* memory_base;
FT_Long memory_size;
FT_String* pathname;
FT_Stream stream;
FT_Module driver;
FT_Int num_params;
FT_Parameter* params;
} FT_Open_Args;
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_New_Face
*/
/*
*/
/* <Description>
*/
/* Call @FT_Open_Face to open a font by its pathname.
*/
/*
*/
/* <InOut>
*/
/* library :: A handle to the library resource.
*/
/*
*/
/* <Input>
*/
/* pathname :: A path to the font file.
*/
/*
*/
/* face_index :: See @FT_Open_Face for a detailed description of this
*/
/* parameter.
*/
/*
*/
/* <Output>
*/
/* aface :: A handle to a new face object. If `face_index'
is */
/* greater than or equal to zero, it must be non-NULL.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* Use @FT_Done_Face to destroy the created @FT_Face object (along
*/
/* with its slot and sizes).
*/
/*
*/
FT_EXPORT( FT_Error )
FT_New_Face( FT_Library library,
const char* filepathname,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_New_Memory_Face
*/
/*
*/
/* <Description>
*/
/* Call @FT_Open_Face to open a font that has been loaded into
*/
/* memory.
*/
/*
*/
/* <InOut>
*/
/* library :: A handle to the library resource.
*/
/*
*/
/* <Input>
*/
/* file_base :: A pointer to the beginning of the font data.
*/
/*
*/
/* file_size :: The size of the memory chunk used by the font data.
*/
/*
*/
/* face_index :: See @FT_Open_Face for a detailed description of this
*/
/* parameter.
*/
/*
*/
/* <Output>
*/
/* aface :: A handle to a new face object. If `face_index'
is */
/* greater than or equal to zero, it must be non-NULL.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* You must not deallocate the memory before calling @FT_Done_Face.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_New_Memory_Face( FT_Library library,
const FT_Byte* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Open_Face
*/
/*
*/
/* <Description>
*/
/* Create a face object from a given resource described by
*/
/* @FT_Open_Args.
*/
/*
*/
/* <InOut>
*/
/* library :: A handle to the library resource.
*/
/*
*/
/* <Input>
*/
/* args :: A pointer to an `FT_Open_Args' structure that
must */
/* be filled by the caller.
*/
/*
*/
/* face_index :: This field holds two different values. Bits 0-15
*/
/* are the index of the face in the font file (starting
*/
/* with value~0). Set it to~0 if there is only one
*/
/* face in the font file.
*/
/*
*/
/* Bits 16-30 are relevant to GX and OpenType variation
*/
/* fonts only, specifying the named instance index for
*/
/* the current face index (starting with value~1;
*/
/* value~0 makes FreeType ignore named instances). For
*/
/* non-variation fonts, bits 16-30 are ignored.
*/
/* Assuming that you want to access the third named
*/
/* instance in face~4, `face_index' should be set
to */
/* 0x00030004. If you want to access face~4 without
*/
/* variation handling, simply set `face_index' to
*/
/* value~4.
*/
/*
*/
/* `FT_Open_Face' and its siblings can be used to
*/
/* quickly check whether the font format of a given
*/
/* font resource is supported by FreeType. In general,
*/
/* if the `face_index' argument is negative, the
*/
/* function's return value is~0 if the font format
is */
/* recognized, or non-zero otherwise. The function
*/
/* allocates a more or less empty face handle in
*/
/* `*aface' (if `aface' isn't NULL); the
only two */
/* useful fields in this special case are
*/
/* `face->num_faces' and
`face->style_flags'. For any */
/* negative value of `face_index',
`face->num_faces' */
/* gives the number of faces within the font file. For
*/
/* the negative value `-(N+1)' (with `N' a
non-negative */
/* 16-bit value), bits 16-30 in
`face->style_flags' */
/* give the number of named instances in face `N'
if we */
/* have a variation font (or zero otherwise). After
*/
/* examination, the returned @FT_Face structure should
*/
/* be deallocated with a call to @FT_Done_Face.
*/
/*
*/
/* <Output>
*/
/* aface :: A handle to a new face object. If `face_index'
is */
/* greater than or equal to zero, it must be non-NULL.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* Unlike FreeType 1.x, this function automatically creates a glyph
*/
/* slot for the face object that can be accessed directly through
*/
/* `face->glyph'.
*/
/*
*/
/* Each new face object created with this function also owns a
*/
/* default @FT_Size object, accessible as `face->size'.
*/
/*
*/
/* One @FT_Library instance can have multiple face objects, this is,
*/
/* @FT_Open_Face and its siblings can be called multiple times using
*/
/* the same `library' argument.
*/
/*
*/
/* See the discussion of reference counters in the description of
*/
/* @FT_Reference_Face.
*/
/*
*/
/* To loop over all faces, use code similar to the following snippet
*/
/* (omitting the error handling).
*/
/*
*/
/* {
*/
/* ...
*/
/* FT_Face face;
*/
/* FT_Long i, num_faces;
*/
/*
*/
/*
*/
/* error = FT_Open_Face( library, args, -1, &face );
*/
/* if ( error ) { ... }
*/
/*
*/
/* num_faces = face->num_faces;
*/
/* FT_Done_Face( face );
*/
/*
*/
/* for ( i = 0; i < num_faces; i++ )
*/
/* {
*/
/* ...
*/
/* error = FT_Open_Face( library, args, i, &face );
*/
/* ...
*/
/* FT_Done_Face( face );
*/
/* ...
*/
/* }
*/
/* }
*/
/*
*/
/* To loop over all valid values for `face_index', use something
*/
/* similar to the following snippet, again without error handling.
*/
/* The code accesses all faces immediately (thus only a single call
*/
/* of `FT_Open_Face' within the do-loop), with and without named
*/
/* instances.
*/
/*
*/
/* {
*/
/* ...
*/
/* FT_Face face;
*/
/*
*/
/* FT_Long num_faces = 0;
*/
/* FT_Long num_instances = 0;
*/
/*
*/
/* FT_Long face_idx = 0;
*/
/* FT_Long instance_idx = 0;
*/
/*
*/
/*
*/
/* do
*/
/* {
*/
/* FT_Long id = ( instance_idx << 16 ) + face_idx;
*/
/*
*/
/*
*/
/* error = FT_Open_Face( library, args, id, &face );
*/
/* if ( error ) { ... }
*/
/*
*/
/* num_faces = face->num_faces;
*/
/* num_instances = face->style_flags >> 16;
*/
/*
*/
/* ...
*/
/*
*/
/* FT_Done_Face( face );
*/
/*
*/
/* if ( instance_idx < num_instances )
*/
/* instance_idx++;
*/
/* else
*/
/* {
*/
/* face_idx++;
*/
/* instance_idx = 0;
*/
/* }
*/
/*
*/
/* } while ( face_idx < num_faces )
*/
/* }
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Open_Face( FT_Library library,
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Attach_File
*/
/*
*/
/* <Description>
*/
/* Call @FT_Attach_Stream to attach a file.
*/
/*
*/
/* <InOut>
*/
/* face :: The target face object.
*/
/*
*/
/* <Input>
*/
/* filepathname :: The pathname.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Attach_File( FT_Face face,
const char* filepathname );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Attach_Stream
*/
/*
*/
/* <Description>
*/
/* `Attach' data to a face object. Normally, this is used to
read */
/* additional information for the face object. For example, you can
*/
/* attach an AFM file that comes with a Type~1 font to get the
*/
/* kerning values and other metrics.
*/
/*
*/
/* <InOut>
*/
/* face :: The target face object.
*/
/*
*/
/* <Input>
*/
/* parameters :: A pointer to @FT_Open_Args that must be filled by
*/
/* the caller.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* The meaning of the `attach' (i.e., what really happens when
the */
/* new file is read) is not fixed by FreeType itself. It really
*/
/* depends on the font format (and thus the font driver).
*/
/*
*/
/* Client applications are expected to know what they are doing
*/
/* when invoking this function. Most drivers simply do not implement
*/
/* file or stream attachments.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Reference_Face
*/
/*
*/
/* <Description>
*/
/* A counter gets initialized to~1 at the time an @FT_Face structure
*/
/* is created. This function increments the counter. @FT_Done_Face
*/
/* then only destroys a face if the counter is~1, otherwise it simply
*/
/* decrements the counter.
*/
/*
*/
/* This function helps in managing life-cycles of structures that
*/
/* reference @FT_Face objects.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to a target face object.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Since>
*/
/* 2.4.2
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Reference_Face( FT_Face face );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Done_Face
*/
/*
*/
/* <Description>
*/
/* Discard a given face object, as well as all of its child slots and
*/
/* sizes.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to a target face object.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* See the discussion of reference counters in the description of
*/
/* @FT_Reference_Face.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Done_Face( FT_Face face );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Select_Size
*/
/*
*/
/* <Description>
*/
/* Select a bitmap strike. To be more precise, this function sets
*/
/* the scaling factors of the active @FT_Size object in a face so
*/
/* that bitmaps from this particular strike are taken by
*/
/* @FT_Load_Glyph and friends.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to a target face object.
*/
/*
*/
/* <Input>
*/
/* strike_index :: The index of the bitmap strike in the
*/
/* `available_sizes' field of @FT_FaceRec
structure. */
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* For bitmaps embedded in outline fonts it is common that only a
*/
/* subset of the available glyphs at a given ppem value is available.
*/
/* FreeType silently uses outlines if there is no bitmap for a given
*/
/* glyph index.
*/
/*
*/
/* For GX and OpenType variation fonts, a bitmap strike makes sense
*/
/* only if the default instance is active (this is, no glyph
*/
/* variation takes place); otherwise, FreeType simply ignores bitmap
*/
/* strikes. The same is true for all named instances that are
*/
/* different from the default instance.
*/
/*
*/
/* Don't use this function if you are using the FreeType cache
API. */
/*
*/
FT_EXPORT( FT_Error )
FT_Select_Size( FT_Face face,
FT_Int strike_index );
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_Size_Request_Type
*/
/*
*/
/* <Description>
*/
/* An enumeration type that lists the supported size request types,
*/
/* i.e., what input size (in font units) maps to the requested output
*/
/* size (in pixels, as computed from the arguments of
*/
/* @FT_Size_Request).
*/
/*
*/
/* <Values>
*/
/* FT_SIZE_REQUEST_TYPE_NOMINAL ::
*/
/* The nominal size. The `units_per_EM' field of @FT_FaceRec
is */
/* used to determine both scaling values.
*/
/*
*/
/* This is the standard scaling found in most applications. In
*/
/* particular, use this size request type for TrueType fonts if
*/
/* they provide optical scaling or something similar. Note,
*/
/* however, that `units_per_EM' is a rather abstract value
which */
/* bears no relation to the actual size of the glyphs in a font.
*/
/*
*/
/* FT_SIZE_REQUEST_TYPE_REAL_DIM ::
*/
/* The real dimension. The sum of the `ascender' and (minus
of) */
/* the `descender' fields of @FT_FaceRec is used to determine
both */
/* scaling values.
*/
/*
*/
/* FT_SIZE_REQUEST_TYPE_BBOX ::
*/
/* The font bounding box. The width and height of the `bbox'
field */
/* of @FT_FaceRec are used to determine the horizontal and vertical
*/
/* scaling value, respectively.
*/
/*
*/
/* FT_SIZE_REQUEST_TYPE_CELL ::
*/
/* The `max_advance_width' field of @FT_FaceRec is used to
*/
/* determine the horizontal scaling value; the vertical scaling
*/
/* value is determined the same way as
*/
/* @FT_SIZE_REQUEST_TYPE_REAL_DIM does. Finally, both scaling
*/
/* values are set to the smaller one. This type is useful if you
*/
/* want to specify the font size for, say, a window of a given
*/
/* dimension and 80x24 cells.
*/
/*
*/
/* FT_SIZE_REQUEST_TYPE_SCALES ::
*/
/* Specify the scaling values directly.
*/
/*
*/
/* <Note>
*/
/* The above descriptions only apply to scalable formats. For bitmap
*/
/* formats, the behaviour is up to the driver.
*/
/*
*/
/* See the note section of @FT_Size_Metrics if you wonder how size
*/
/* requesting relates to scaling values.
*/
/*
*/
typedef enum FT_Size_Request_Type_
{
FT_SIZE_REQUEST_TYPE_NOMINAL,
FT_SIZE_REQUEST_TYPE_REAL_DIM,
FT_SIZE_REQUEST_TYPE_BBOX,
FT_SIZE_REQUEST_TYPE_CELL,
FT_SIZE_REQUEST_TYPE_SCALES,
FT_SIZE_REQUEST_TYPE_MAX
} FT_Size_Request_Type;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Size_RequestRec
*/
/*
*/
/* <Description>
*/
/* A structure to model a size request.
*/
/*
*/
/* <Fields>
*/
/* type :: See @FT_Size_Request_Type.
*/
/*
*/
/* width :: The desired width, given as a 26.6 fractional
*/
/* point value (with 72pt = 1in).
*/
/*
*/
/* height :: The desired height, given as a 26.6 fractional
*/
/* point value (with 72pt = 1in).
*/
/*
*/
/* horiResolution :: The horizontal resolution (dpi, i.e., pixels per
*/
/* inch). If set to zero, `width' is treated
as a */
/* 26.6 fractional *pixel* value, which gets
*/
/* internally rounded to an integer.
*/
/*
*/
/* vertResolution :: The vertical resolution (dpi, i.e., pixels per
*/
/* inch). If set to zero, `height' is treated
as a */
/* 26.6 fractional *pixel* value, which gets
*/
/* internally rounded to an integer.
*/
/*
*/
/* <Note>
*/
/* If `width' is zero, the horizontal scaling value is set equal
*/
/* to the vertical scaling value, and vice versa.
*/
/*
*/
/* If `type' is FT_SIZE_REQUEST_TYPE_SCALES, `width' and
`height' are */
/* interpreted directly as 16.16 fractional scaling values, without
*/
/* any further modification, and both `horiResolution' and
*/
/* `vertResolution' are ignored.
*/
/*
*/
typedef struct FT_Size_RequestRec_
{
FT_Size_Request_Type type;
FT_Long width;
FT_Long height;
FT_UInt horiResolution;
FT_UInt vertResolution;
} FT_Size_RequestRec;
/*************************************************************************/
/*
*/
/* <Struct>
*/
/* FT_Size_Request
*/
/*
*/
/* <Description>
*/
/* A handle to a size request structure.
*/
/*
*/
typedef struct FT_Size_RequestRec_ *FT_Size_Request;
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Request_Size
*/
/*
*/
/* <Description>
*/
/* Resize the scale of the active @FT_Size object in a face.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to a target face object.
*/
/*
*/
/* <Input>
*/
/* req :: A pointer to a @FT_Size_RequestRec.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* Although drivers may select the bitmap strike matching the
*/
/* request, you should not rely on this if you intend to select a
*/
/* particular bitmap strike. Use @FT_Select_Size instead in that
*/
/* case.
*/
/*
*/
/* The relation between the requested size and the resulting glyph
*/
/* size is dependent entirely on how the size is defined in the
*/
/* source face. The font designer chooses the final size of each
*/
/* glyph relative to this size. For more information refer to
*/
/*
`https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html'. */
/*
*/
/* Contrary to @FT_Set_Char_Size, this function doesn't have
special */
/* code to normalize zero-valued widths, heights, or resolutions
*/
/* (which lead to errors in most cases).
*/
/*
*/
/* Don't use this function if you are using the FreeType cache
API. */
/*
*/
FT_EXPORT( FT_Error )
FT_Request_Size( FT_Face face,
FT_Size_Request req );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Set_Char_Size
*/
/*
*/
/* <Description>
*/
/* Call @FT_Request_Size to request the nominal size (in points).
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to a target face object.
*/
/*
*/
/* <Input>
*/
/* char_width :: The nominal width, in 26.6 fractional points.
*/
/*
*/
/* char_height :: The nominal height, in 26.6 fractional points.
*/
/*
*/
/* horz_resolution :: The horizontal resolution in dpi.
*/
/*
*/
/* vert_resolution :: The vertical resolution in dpi.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* While this function allows fractional points as input values, the
*/
/* resulting ppem value for the given resolution is always rounded to
*/
/* the nearest integer.
*/
/*
*/
/* If either the character width or height is zero, it is set equal
*/
/* to the other value.
*/
/*
*/
/* If either the horizontal or vertical resolution is zero, it is set
*/
/* equal to the other value.
*/
/*
*/
/* A character width or height smaller than 1pt is set to 1pt; if
*/
/* both resolution values are zero, they are set to 72dpi.
*/
/*
*/
/* Don't use this function if you are using the FreeType cache
API. */
/*
*/
FT_EXPORT( FT_Error )
FT_Set_Char_Size( FT_Face face,
FT_F26Dot6 char_width,
FT_F26Dot6 char_height,
FT_UInt horz_resolution,
FT_UInt vert_resolution );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Set_Pixel_Sizes
*/
/*
*/
/* <Description>
*/
/* Call @FT_Request_Size to request the nominal size (in pixels).
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to the target face object.
*/
/*
*/
/* <Input>
*/
/* pixel_width :: The nominal width, in pixels.
*/
/*
*/
/* pixel_height :: The nominal height, in pixels.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* You should not rely on the resulting glyphs matching or being
*/
/* constrained to this pixel size. Refer to @FT_Request_Size to
*/
/* understand how requested sizes relate to actual sizes.
*/
/*
*/
/* Don't use this function if you are using the FreeType cache
API. */
/*
*/
FT_EXPORT( FT_Error )
FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Load_Glyph
*/
/*
*/
/* <Description>
*/
/* Load a glyph into the glyph slot of a face object.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to the target face object where the glyph
*/
/* is loaded.
*/
/*
*/
/* <Input>
*/
/* glyph_index :: The index of the glyph in the font file. For
*/
/* CID-keyed fonts (either in PS or in CFF format)
*/
/* this argument specifies the CID value.
*/
/*
*/
/* load_flags :: A flag indicating what to load for this glyph. The
*/
/* @FT_LOAD_XXX constants can be used to control the
*/
/* glyph loading process (e.g., whether the outline
*/
/* should be scaled, whether to load bitmaps or not,
*/
/* whether to hint the outline, etc).
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* The loaded glyph may be transformed. See @FT_Set_Transform for
*/
/* the details.
*/
/*
*/
/* For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument' is
*/
/* returned for invalid CID values (this is, for CID values that
*/
/* don't have a corresponding glyph in the font). See the
discussion */
/* of the @FT_FACE_FLAG_CID_KEYED flag for more details.
*/
/*
*/
/* If you receive `FT_Err_Glyph_Too_Big', try getting the glyph
*/
/* outline at EM size, then scale it manually and fill it as a
*/
/* graphics operation.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int32 load_flags );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Load_Char
*/
/*
*/
/* <Description>
*/
/* Load a glyph into the glyph slot of a face object, accessed by its
*/
/* character code.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to a target face object where the glyph
*/
/* is loaded.
*/
/*
*/
/* <Input>
*/
/* char_code :: The glyph's character code, according to the
*/
/* current charmap used in the face.
*/
/*
*/
/* load_flags :: A flag indicating what to load for this glyph. The
*/
/* @FT_LOAD_XXX constants can be used to control the
*/
/* glyph loading process (e.g., whether the outline
*/
/* should be scaled, whether to load bitmaps or not,
*/
/* whether to hint the outline, etc).
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* This function simply calls @FT_Get_Char_Index and @FT_Load_Glyph.
*/
/*
*/
/* Many fonts contain glyphs that can't be loaded by this
function */
/* since its glyph indices are not listed in any of the font's
*/
/* charmaps.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Load_Char( FT_Face face,
FT_ULong char_code,
FT_Int32 load_flags );
/*************************************************************************
*
* @enum:
* FT_LOAD_XXX
*
* @description:
* A list of bit field constants for @FT_Load_Glyph to indicate what
* kind of operations to perform during glyph loading.
*
* @values:
* FT_LOAD_DEFAULT ::
* Corresponding to~0, this value is used as the default glyph load
* operation. In this case, the following happens:
*
* 1. FreeType looks for a bitmap for the glyph corresponding to the
* face's current size. If one is found, the function
returns.
* The bitmap data can be accessed from the glyph slot (see note
* below).
*
* 2. If no embedded bitmap is searched for or found, FreeType looks
* for a scalable outline. If one is found, it is loaded from
* the font file, scaled to device pixels, then `hinted' to
the
* pixel grid in order to optimize it. The outline data can be
* accessed from the glyph slot (see note below).
*
* Note that by default the glyph loader doesn't render outlines
into
* bitmaps. The following flags are used to modify this default
* behaviour to more specific and useful cases.
*
* FT_LOAD_NO_SCALE ::
* Don't scale the loaded outline glyph but keep it in font
units.
*
* This flag implies @FT_LOAD_NO_HINTING and @FT_LOAD_NO_BITMAP, and
* unsets @FT_LOAD_RENDER.
*
* If the font is `tricky' (see @FT_FACE_FLAG_TRICKY for more),
using
* FT_LOAD_NO_SCALE usually yields meaningless outlines because the
* subglyphs must be scaled and positioned with hinting instructions.
* This can be solved by loading the font without FT_LOAD_NO_SCALE
and
* setting the character size to `font->units_per_EM'.
*
* FT_LOAD_NO_HINTING ::
* Disable hinting. This generally generates `blurrier' bitmap
glyphs
* when the glyph are rendered in any of the anti-aliased modes. See
* also the note below.
*
* This flag is implied by @FT_LOAD_NO_SCALE.
*
* FT_LOAD_RENDER ::
* Call @FT_Render_Glyph after the glyph is loaded. By default, the
* glyph is rendered in @FT_RENDER_MODE_NORMAL mode. This can be
* overridden by @FT_LOAD_TARGET_XXX or @FT_LOAD_MONOCHROME.
*
* This flag is unset by @FT_LOAD_NO_SCALE.
*
* FT_LOAD_NO_BITMAP ::
* Ignore bitmap strikes when loading. Bitmap-only fonts ignore this
* flag.
*
* @FT_LOAD_NO_SCALE always sets this flag.
*
* FT_LOAD_VERTICAL_LAYOUT ::
* Load the glyph for vertical text layout. In particular, the
* `advance' value in the @FT_GlyphSlotRec structure is set to
the
* `vertAdvance' value of the `metrics' field.
*
* In case @FT_HAS_VERTICAL doesn't return true, you
shouldn't use
* this flag currently. Reason is that in this case vertical metrics
* get synthesized, and those values are not always consistent across
* various font formats.
*
* FT_LOAD_FORCE_AUTOHINT ::
* Prefer the auto-hinter over the font's native hinter. See
also
* the note below.
*
* FT_LOAD_PEDANTIC ::
* Make the font driver perform pedantic verifications during glyph
* loading. This is mostly used to detect broken glyphs in fonts.
* By default, FreeType tries to handle broken fonts also.
*
* In particular, errors from the TrueType bytecode engine are not
* passed to the application if this flag is not set; this might
* result in partially hinted or distorted glyphs in case a
glyph's
* bytecode is buggy.
*
* FT_LOAD_NO_RECURSE ::
* Don't load composite glyphs recursively. Instead, the font
* driver should set the `num_subglyph' and `subglyphs'
values of
* the glyph slot accordingly, and set `glyph->format' to
* @FT_GLYPH_FORMAT_COMPOSITE. The description of subglyphs can
* then be accessed with @FT_Get_SubGlyph_Info.
*
* This flag implies @FT_LOAD_NO_SCALE and @FT_LOAD_IGNORE_TRANSFORM.
*
* FT_LOAD_IGNORE_TRANSFORM ::
* Ignore the transform matrix set by @FT_Set_Transform.
*
* FT_LOAD_MONOCHROME ::
* This flag is used with @FT_LOAD_RENDER to indicate that you want
to
* render an outline glyph to a 1-bit monochrome bitmap glyph, with
* 8~pixels packed into each byte of the bitmap data.
*
* Note that this has no effect on the hinting algorithm used. You
* should rather use @FT_LOAD_TARGET_MONO so that the
* monochrome-optimized hinting algorithm is used.
*
* FT_LOAD_LINEAR_DESIGN ::
* Keep `linearHoriAdvance' and `linearVertAdvance' fields
of
* @FT_GlyphSlotRec in font units. See @FT_GlyphSlotRec for
* details.
*
* FT_LOAD_NO_AUTOHINT ::
* Disable the auto-hinter. See also the note below.
*
* FT_LOAD_COLOR ::
* Load embedded color bitmap images. The resulting color bitmaps,
* if available, will have the @FT_PIXEL_MODE_BGRA format. If the
* flag is not set and color bitmaps are found, they are converted
* to 256-level gray bitmaps transparently, using the
* @FT_PIXEL_MODE_GRAY format.
*
* FT_LOAD_COMPUTE_METRICS ::
* Compute glyph metrics from the glyph data, without the use of
* bundled metrics tables (for example, the `hdmx' table in
TrueType
* fonts). This flag is mainly used by font validating or font
* editing applications, which need to ignore, verify, or edit those
* tables.
*
* Currently, this flag is only implemented for TrueType fonts.
*
* FT_LOAD_BITMAP_METRICS_ONLY ::
* Request loading of the metrics and bitmap image information of a
* (possibly embedded) bitmap glyph without allocating or copying
* the bitmap image data itself. No effect if the target glyph is
* not a bitmap image.
*
* This flag unsets @FT_LOAD_RENDER.
*
* FT_LOAD_CROP_BITMAP ::
* Ignored. Deprecated.
*
* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ::
* Ignored. Deprecated.
*
* @note:
* By default, hinting is enabled and the font's native hinter
(see
* @FT_FACE_FLAG_HINTER) is preferred over the auto-hinter. You can
* disable hinting by setting @FT_LOAD_NO_HINTING or change the
* precedence by setting @FT_LOAD_FORCE_AUTOHINT. You can also set
* @FT_LOAD_NO_AUTOHINT in case you don't want the auto-hinter to
be
* used at all.
*
* See the description of @FT_FACE_FLAG_TRICKY for a special exception
* (affecting only a handful of Asian fonts).
*
* Besides deciding which hinter to use, you can also decide which
* hinting algorithm to use. See @FT_LOAD_TARGET_XXX for details.
*
* Note that the auto-hinter needs a valid Unicode cmap (either a
native
* one or synthesized by FreeType) for producing correct results. If a
* font provides an incorrect mapping (for example, assigning the
* character code U+005A, LATIN CAPITAL LETTER Z, to a glyph depicting
a
* mathematical integral sign), the auto-hinter might produce useless
* results.
*
*/
#define FT_LOAD_DEFAULT 0x0
#define FT_LOAD_NO_SCALE ( 1L << 0 )
#define FT_LOAD_NO_HINTING ( 1L << 1 )
#define FT_LOAD_RENDER ( 1L << 2 )
#define FT_LOAD_NO_BITMAP ( 1L << 3 )
#define FT_LOAD_VERTICAL_LAYOUT ( 1L << 4 )
#define FT_LOAD_FORCE_AUTOHINT ( 1L << 5 )
#define FT_LOAD_CROP_BITMAP ( 1L << 6 )
#define FT_LOAD_PEDANTIC ( 1L << 7 )
#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ( 1L << 9 )
#define FT_LOAD_NO_RECURSE ( 1L << 10 )
#define FT_LOAD_IGNORE_TRANSFORM ( 1L << 11 )
#define FT_LOAD_MONOCHROME ( 1L << 12 )
#define FT_LOAD_LINEAR_DESIGN ( 1L << 13 )
#define FT_LOAD_NO_AUTOHINT ( 1L << 15 )
/* Bits 16-19 are used by `FT_LOAD_TARGET_' */
#define FT_LOAD_COLOR ( 1L << 20 )
#define FT_LOAD_COMPUTE_METRICS ( 1L << 21 )
#define FT_LOAD_BITMAP_METRICS_ONLY ( 1L << 22 )
/* */
/* used internally only by certain font drivers */
#define FT_LOAD_ADVANCE_ONLY ( 1L << 8 )
#define FT_LOAD_SBITS_ONLY ( 1L << 14 )
/**************************************************************************
*
* @enum:
* FT_LOAD_TARGET_XXX
*
* @description:
* A list of values to select a specific hinting algorithm for the
* hinter. You should OR one of these values to your `load_flags'
* when calling @FT_Load_Glyph.
*
* Note that a font's native hinters may ignore the hinting
algorithm
* you have specified (e.g., the TrueType bytecode interpreter). You
* can set @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is
* used.
*
* @values:
* FT_LOAD_TARGET_NORMAL ::
* The default hinting algorithm, optimized for standard gray-level
* rendering. For monochrome output, use @FT_LOAD_TARGET_MONO
* instead.
*
* FT_LOAD_TARGET_LIGHT ::
* A lighter hinting algorithm for gray-level modes. Many generated
* glyphs are fuzzier but better resemble their original shape. This
* is achieved by snapping glyphs to the pixel grid only vertically
* (Y-axis), as is done by FreeType's new CFF engine or
Microsoft's
* ClearType font renderer. This preserves inter-glyph spacing in
* horizontal text. The snapping is done either by the native font
* driver, if the driver itself and the font support it, or by the
* auto-hinter.
*
* Advance widths are rounded to integer values; however, using the
* `lsb_delta' and `rsb_delta' fields of @FT_GlyphSlotRec,
it is
* possible to get fractional advance widths for sub-pixel
positioning
* (which is recommended to use).
*
* If configuration option AF_CONFIG_OPTION_TT_SIZE_METRICS is
active,
* TrueType-like metrics are used to make this mode behave similarly
* as in unpatched FreeType versions between 2.4.6 and 2.7.1
* (inclusive).
*
* FT_LOAD_TARGET_MONO ::
* Strong hinting algorithm that should only be used for monochrome
* output. The result is probably unpleasant if the glyph is
rendered
* in non-monochrome modes.
*
* FT_LOAD_TARGET_LCD ::
* A variant of @FT_LOAD_TARGET_LIGHT optimized for horizontally
* decimated LCD displays.
*
* FT_LOAD_TARGET_LCD_V ::
* A variant of @FT_LOAD_TARGET_NORMAL optimized for vertically
* decimated LCD displays.
*
* @note:
* You should use only _one_ of the FT_LOAD_TARGET_XXX values in your
* `load_flags'. They can't be ORed.
*
* If @FT_LOAD_RENDER is also set, the glyph is rendered in the
* corresponding mode (i.e., the mode that matches the used algorithm
* best). An exception is FT_LOAD_TARGET_MONO since it implies
* @FT_LOAD_MONOCHROME.
*
* You can use a hinting algorithm that doesn't correspond to the
same
* rendering mode. As an example, it is possible to use the
`light'
* hinting algorithm and have the results rendered in horizontal LCD
* pixel mode, with code like
*
* {
* FT_Load_Glyph( face, glyph_index,
* load_flags | FT_LOAD_TARGET_LIGHT );
*
* FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD );
* }
*
* In general, you should stick with one rendering mode. For example,
* switching between @FT_LOAD_TARGET_NORMAL and @FT_LOAD_TARGET_MONO
* enforces a lot of recomputation for TrueType fonts, which is slow.
* Another reason is caching: Selecting a different mode usually causes
* changes in both the outlines and the rasterized bitmaps; it is thus
* necessary to empty the cache after a mode switch to avoid false
hits.
*
*/
#define FT_LOAD_TARGET_( x ) ( (FT_Int32)( (x) & 15 ) << 16 )
#define FT_LOAD_TARGET_NORMAL FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL )
#define FT_LOAD_TARGET_LIGHT FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT )
#define FT_LOAD_TARGET_MONO FT_LOAD_TARGET_( FT_RENDER_MODE_MONO )
#define FT_LOAD_TARGET_LCD FT_LOAD_TARGET_( FT_RENDER_MODE_LCD )
#define FT_LOAD_TARGET_LCD_V FT_LOAD_TARGET_( FT_RENDER_MODE_LCD_V )
/**************************************************************************
*
* @macro:
* FT_LOAD_TARGET_MODE
*
* @description:
* Return the @FT_Render_Mode corresponding to a given
* @FT_LOAD_TARGET_XXX value.
*
*/
#define FT_LOAD_TARGET_MODE( x ) ( (FT_Render_Mode)( ( (x) >> 16 )
& 15 ) )
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Set_Transform
*/
/*
*/
/* <Description>
*/
/* Set the transformation that is applied to glyph images when they
*/
/* are loaded into a glyph slot through @FT_Load_Glyph.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Input>
*/
/* matrix :: A pointer to the transformation's 2x2 matrix. Use
NULL */
/* for the identity matrix.
*/
/* delta :: A pointer to the translation vector. Use NULL for the
*/
/* null vector.
*/
/*
*/
/* <Note>
*/
/* The transformation is only applied to scalable image formats after
*/
/* the glyph has been loaded. It means that hinting is unaltered by
*/
/* the transformation and is performed on the character size given in
*/
/* the last call to @FT_Set_Char_Size or @FT_Set_Pixel_Sizes.
*/
/*
*/
/* Note that this also transforms the `face.glyph.advance' field,
but */
/* *not* the values in `face.glyph.metrics'.
*/
/*
*/
FT_EXPORT( void )
FT_Set_Transform( FT_Face face,
FT_Matrix* matrix,
FT_Vector* delta );
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_Render_Mode
*/
/*
*/
/* <Description>
*/
/* Render modes supported by FreeType~2. Each mode corresponds to a
*/
/* specific type of scanline conversion performed on the outline.
*/
/*
*/
/* For bitmap fonts and embedded bitmaps the
`bitmap->pixel_mode' */
/* field in the @FT_GlyphSlotRec structure gives the format of the
*/
/* returned bitmap.
*/
/*
*/
/* All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity,
*/
/* indicating pixel coverage. Use linear alpha blending and gamma
*/
/* correction to correctly render non-monochrome glyph bitmaps onto a
*/
/* surface; see @FT_Render_Glyph.
*/
/*
*/
/* <Values>
*/
/* FT_RENDER_MODE_NORMAL ::
*/
/* Default render mode; it corresponds to 8-bit anti-aliased
*/
/* bitmaps.
*/
/*
*/
/* FT_RENDER_MODE_LIGHT ::
*/
/* This is equivalent to @FT_RENDER_MODE_NORMAL. It is only
*/
/* defined as a separate value because render modes are also used
*/
/* indirectly to define hinting algorithm selectors. See
*/
/* @FT_LOAD_TARGET_XXX for details.
*/
/*
*/
/* FT_RENDER_MODE_MONO ::
*/
/* This mode corresponds to 1-bit bitmaps (with 2~levels of
*/
/* opacity).
*/
/*
*/
/* FT_RENDER_MODE_LCD ::
*/
/* This mode corresponds to horizontal RGB and BGR sub-pixel
*/
/* displays like LCD screens. It produces 8-bit bitmaps that are
*/
/* 3~times the width of the original glyph outline in pixels, and
*/
/* which use the @FT_PIXEL_MODE_LCD mode.
*/
/*
*/
/* FT_RENDER_MODE_LCD_V ::
*/
/* This mode corresponds to vertical RGB and BGR sub-pixel displays
*/
/* (like PDA screens, rotated LCD displays, etc.). It produces
*/
/* 8-bit bitmaps that are 3~times the height of the original
*/
/* glyph outline in pixels and use the @FT_PIXEL_MODE_LCD_V mode.
*/
/*
*/
/* <Note>
*/
/* The LCD-optimized glyph bitmaps produced by `FT_Render_Glyph'
can */
/* be filtered to reduce color-fringes by using
*/
/* @FT_Library_SetLcdFilter (not active in the default builds). It
*/
/* is up to the caller to either call `FT_Library_SetLcdFilter'
(if */
/* available) or do the filtering itself.
*/
/*
*/
/* The selected render mode only affects vector glyphs of a font.
*/
/* Embedded bitmaps often have a different pixel mode like
*/
/* @FT_PIXEL_MODE_MONO. You can use @FT_Bitmap_Convert to transform
*/
/* them into 8-bit pixmaps.
*/
/*
*/
typedef enum FT_Render_Mode_
{
FT_RENDER_MODE_NORMAL = 0,
FT_RENDER_MODE_LIGHT,
FT_RENDER_MODE_MONO,
FT_RENDER_MODE_LCD,
FT_RENDER_MODE_LCD_V,
FT_RENDER_MODE_MAX
} FT_Render_Mode;
/* these constants are deprecated; use the corresponding */
/* `FT_Render_Mode' values instead */
#define ft_render_mode_normal FT_RENDER_MODE_NORMAL
#define ft_render_mode_mono FT_RENDER_MODE_MONO
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Render_Glyph
*/
/*
*/
/* <Description>
*/
/* Convert a given glyph image to a bitmap. It does so by inspecting
*/
/* the glyph image format, finding the relevant renderer, and
*/
/* invoking it.
*/
/*
*/
/* <InOut>
*/
/* slot :: A handle to the glyph slot containing the image to
*/
/* convert.
*/
/*
*/
/* <Input>
*/
/* render_mode :: The render mode used to render the glyph image into
*/
/* a bitmap. See @FT_Render_Mode for a list of
*/
/* possible values.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* To get meaningful results, font scaling values must be set with
*/
/* functions like @FT_Set_Char_Size before calling
`FT_Render_Glyph'. */
/*
*/
/* When FreeType outputs a bitmap of a glyph, it really outputs an
*/
/* alpha coverage map. If a pixel is completely covered by a
*/
/* filled-in outline, the bitmap contains 0xFF at that pixel, meaning
*/
/* that 0xFF/0xFF fraction of that pixel is covered, meaning the
*/
/* pixel is 100% black (or 0% bright). If a pixel is only 50%
*/
/* covered (value 0x80), the pixel is made 50% black (50% bright or a
*/
/* middle shade of grey). 0% covered means 0% black (100% bright or
*/
/* white).
*/
/*
*/
/* On high-DPI screens like on smartphones and tablets, the pixels
*/
/* are so small that their chance of being completely covered and
*/
/* therefore completely black are fairly good. On the low-DPI
*/
/* screens, however, the situation is different. The pixels are too
*/
/* large for most of the details of a glyph and shades of gray are
*/
/* the norm rather than the exception.
*/
/*
*/
/* This is relevant because all our screens have a second problem:
*/
/* they are not linear. 1~+~1 is not~2. Twice the value does not
*/
/* result in twice the brightness. When a pixel is only 50% covered,
*/
/* the coverage map says 50% black, and this translates to a pixel
*/
/* value of 128 when you use 8~bits per channel (0-255). However,
*/
/* this does not translate to 50% brightness for that pixel on our
*/
/* sRGB and gamma~2.2 screens. Due to their non-linearity, they
*/
/* dwell longer in the darks and only a pixel value of about 186
*/
/* results in 50% brightness -- 128 ends up too dark on both bright
*/
/* and dark backgrounds. The net result is that dark text looks
*/
/* burnt-out, pixely and blotchy on bright background, bright text
*/
/* too frail on dark backgrounds, and colored text on colored
*/
/* background (for example, red on green) seems to have dark halos or
*/
/* `dirt' around it. The situation is especially ugly for
diagonal */
/* stems like in `w' glyph shapes where the quality of
FreeType's */
/* anti-aliasing depends on the correct display of grays. On
*/
/* high-DPI screens where smaller, fully black pixels reign supreme,
*/
/* this doesn't matter, but on our low-DPI screens with all the
gray */
/* shades, it does. 0% and 100% brightness are the same things in
*/
/* linear and non-linear space, just all the shades in-between
*/
/* aren't.
*/
/*
*/
/* The blending function for placing text over a background is
*/
/*
*/
/* {
*/
/* dst = alpha * src + (1 - alpha) * dst ,
*/
/* }
*/
/*
*/
/* which is known as the OVER operator.
*/
/*
*/
/* To correctly composite an antialiased pixel of a glyph onto a
*/
/* surface,
*/
/*
*/
/* 1. take the foreground and background colors (e.g., in sRGB space)
*/
/* and apply gamma to get them in a linear space,
*/
/*
*/
/* 2. use OVER to blend the two linear colors using the glyph pixel
*/
/* as the alpha value (remember, the glyph bitmap is an alpha
*/
/* coverage bitmap), and
*/
/*
*/
/* 3. apply inverse gamma to the blended pixel and write it back to
*/
/* the image.
*/
/*
*/
/* Internal testing at Adobe found that a target inverse gamma of~1.8
*/
/* for step~3 gives good results across a wide range of displays with
*/
/* an sRGB gamma curve or a similar one.
*/
/*
*/
/* This process can cost performance. There is an approximation that
*/
/* does not need to know about the background color; see
*/
/* https://bel.fi/alankila/lcd/ and
*/
/* https://bel.fi/alankila/lcd/alpcor.html for details.
*/
/*
*/
/* *ATTENTION*: Linear blending is even more important when dealing
*/
/* with subpixel-rendered glyphs to prevent color-fringing! A
*/
/* subpixel-rendered glyph must first be filtered with a filter that
*/
/* gives equal weight to the three color primaries and does not
*/
/* exceed a sum of 0x100, see section @lcd_filtering. Then the
*/
/* only difference to gray linear blending is that subpixel-rendered
*/
/* linear blending is done 3~times per pixel: red foreground subpixel
*/
/* to red background subpixel and so on for green and blue.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Render_Glyph( FT_GlyphSlot slot,
FT_Render_Mode render_mode );
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_Kerning_Mode
*/
/*
*/
/* <Description>
*/
/* An enumeration to specify the format of kerning values returned by
*/
/* @FT_Get_Kerning.
*/
/*
*/
/* <Values>
*/
/* FT_KERNING_DEFAULT :: Return grid-fitted kerning distances in
*/
/* 26.6 fractional pixels.
*/
/*
*/
/* FT_KERNING_UNFITTED :: Return un-grid-fitted kerning distances in
*/
/* 26.6 fractional pixels.
*/
/*
*/
/* FT_KERNING_UNSCALED :: Return the kerning vector in original font
*/
/* units.
*/
/*
*/
/* <Note>
*/
/* FT_KERNING_DEFAULT returns full pixel values; it also makes
*/
/* FreeType heuristically scale down kerning distances at small ppem
*/
/* values so that they don't become too big.
*/
/*
*/
/* Both FT_KERNING_DEFAULT and FT_KERNING_UNFITTED use the current
*/
/* horizontal scaling factor (as set e.g. with @FT_Set_Char_Size) to
*/
/* convert font units to pixels.
*/
/*
*/
typedef enum FT_Kerning_Mode_
{
FT_KERNING_DEFAULT = 0,
FT_KERNING_UNFITTED,
FT_KERNING_UNSCALED
} FT_Kerning_Mode;
/* these constants are deprecated; use the corresponding */
/* `FT_Kerning_Mode' values instead */
#define ft_kerning_default FT_KERNING_DEFAULT
#define ft_kerning_unfitted FT_KERNING_UNFITTED
#define ft_kerning_unscaled FT_KERNING_UNSCALED
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Kerning
*/
/*
*/
/* <Description>
*/
/* Return the kerning vector between two glyphs of the same face.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to a source face object.
*/
/*
*/
/* left_glyph :: The index of the left glyph in the kern pair.
*/
/*
*/
/* right_glyph :: The index of the right glyph in the kern pair.
*/
/*
*/
/* kern_mode :: See @FT_Kerning_Mode for more information.
*/
/* Determines the scale and dimension of the returned
*/
/* kerning vector.
*/
/*
*/
/* <Output>
*/
/* akerning :: The kerning vector. This is either in font units,
*/
/* fractional pixels (26.6 format), or pixels for
*/
/* scalable formats, and in pixels for fixed-sizes
*/
/* formats.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* Only horizontal layouts (left-to-right & right-to-left) are
*/
/* supported by this method. Other layouts, or more sophisticated
*/
/* kernings, are out of the scope of this API function -- they can be
*/
/* implemented through format-specific interfaces.
*/
/*
*/
/* Kerning for OpenType fonts implemented in a `GPOS' table is
not */
/* supported; use @FT_HAS_KERNING to find out whether a font has data
*/
/* that can be extracted with `FT_Get_Kerning'.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Get_Kerning( FT_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_UInt kern_mode,
FT_Vector *akerning );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Track_Kerning
*/
/*
*/
/* <Description>
*/
/* Return the track kerning for a given face object at a given size.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to a source face object.
*/
/*
*/
/* point_size :: The point size in 16.16 fractional points.
*/
/*
*/
/* degree :: The degree of tightness. Increasingly negative
*/
/* values represent tighter track kerning, while
*/
/* increasingly positive values represent looser track
*/
/* kerning. Value zero means no track kerning.
*/
/*
*/
/* <Output>
*/
/* akerning :: The kerning in 16.16 fractional points, to be
*/
/* uniformly applied between all glyphs.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* Currently, only the Type~1 font driver supports track kerning,
*/
/* using data from AFM files (if attached with @FT_Attach_File or
*/
/* @FT_Attach_Stream).
*/
/*
*/
/* Only very few AFM files come with track kerning data; please refer
*/
/* to Adobe's AFM specification for more details.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Get_Track_Kerning( FT_Face face,
FT_Fixed point_size,
FT_Int degree,
FT_Fixed* akerning );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Glyph_Name
*/
/*
*/
/* <Description>
*/
/* Retrieve the ASCII name of a given glyph in a face. This only
*/
/* works for those faces where @FT_HAS_GLYPH_NAMES(face) returns~1.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to a source face object.
*/
/*
*/
/* glyph_index :: The glyph index.
*/
/*
*/
/* buffer_max :: The maximum number of bytes available in the
*/
/* buffer.
*/
/*
*/
/* <Output>
*/
/* buffer :: A pointer to a target buffer where the name is
*/
/* copied to.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* An error is returned if the face doesn't provide glyph names
or if */
/* the glyph index is invalid. In all cases of failure, the first
*/
/* byte of `buffer' is set to~0 to indicate an empty name.
*/
/*
*/
/* The glyph name is truncated to fit within the buffer if it is too
*/
/* long. The returned string is always zero-terminated.
*/
/*
*/
/* Be aware that FreeType reorders glyph indices internally so that
*/
/* glyph index~0 always corresponds to the `missing glyph'
(called */
/* `.notdef').
*/
/*
*/
/* This function always returns an error if the config macro
*/
/* `FT_CONFIG_OPTION_NO_GLYPH_NAMES' is not defined in
`ftoption.h'. */
/*
*/
FT_EXPORT( FT_Error )
FT_Get_Glyph_Name( FT_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Postscript_Name
*/
/*
*/
/* <Description>
*/
/* Retrieve the ASCII PostScript name of a given face, if available.
*/
/* This only works with PostScript, TrueType, and OpenType fonts.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Return>
*/
/* A pointer to the face's PostScript name. NULL if unavailable.
*/
/*
*/
/* <Note>
*/
/* The returned pointer is owned by the face and is destroyed with
*/
/* it.
*/
/*
*/
/* For variation fonts, this string changes if you select a different
*/
/* instance, and you have to call `FT_Get_PostScript_Name' again
to */
/* retrieve it. FreeType follows Adobe TechNote #5902, `Generating
*/
/* PostScript Names for Fonts Using OpenType Font Variations'.
*/
/*
*/
/*
http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/font/pdfs/5902.AdobePSNameGeneration.html
*/
/*
*/
FT_EXPORT( const char* )
FT_Get_Postscript_Name( FT_Face face );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Select_Charmap
*/
/*
*/
/* <Description>
*/
/* Select a given charmap by its encoding tag (as listed in
*/
/* `freetype.h').
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Input>
*/
/* encoding :: A handle to the selected encoding.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* This function returns an error if no charmap in the face
*/
/* corresponds to the encoding queried here.
*/
/*
*/
/* Because many fonts contain more than a single cmap for Unicode
*/
/* encoding, this function has some special code to select the one
*/
/* that covers Unicode best (`best' in the sense that a UCS-4
cmap is */
/* preferred to a UCS-2 cmap). It is thus preferable to
*/
/* @FT_Set_Charmap in this case.
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Select_Charmap( FT_Face face,
FT_Encoding encoding );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Set_Charmap
*/
/*
*/
/* <Description>
*/
/* Select a given charmap for character code to glyph index mapping.
*/
/*
*/
/* <InOut>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Input>
*/
/* charmap :: A handle to the selected charmap.
*/
/*
*/
/* <Return>
*/
/* FreeType error code. 0~means success.
*/
/*
*/
/* <Note>
*/
/* This function returns an error if the charmap is not part of
*/
/* the face (i.e., if it is not listed in the `face->charmaps'
*/
/* table).
*/
/*
*/
/* It also fails if an OpenType type~14 charmap is selected (which
*/
/* doesn't map character codes to glyph indices at all).
*/
/*
*/
FT_EXPORT( FT_Error )
FT_Set_Charmap( FT_Face face,
FT_CharMap charmap );
/*************************************************************************
*
* @function:
* FT_Get_Charmap_Index
*
* @description:
* Retrieve index of a given charmap.
*
* @input:
* charmap ::
* A handle to a charmap.
*
* @return:
* The index into the array of character maps within the face to which
* `charmap' belongs. If an error occurs, -1 is returned.
*
*/
FT_EXPORT( FT_Int )
FT_Get_Charmap_Index( FT_CharMap charmap );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Char_Index
*/
/*
*/
/* <Description>
*/
/* Return the glyph index of a given character code. This function
*/
/* uses the currently selected charmap to do the mapping.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* charcode :: The character code.
*/
/*
*/
/* <Return>
*/
/* The glyph index. 0~means `undefined character code'.
*/
/*
*/
/* <Note>
*/
/* If you use FreeType to manipulate the contents of font files
*/
/* directly, be aware that the glyph index returned by this function
*/
/* doesn't always correspond to the internal indices used within
the */
/* file. This is done to ensure that value~0 always corresponds to
*/
/* the `missing glyph'. If the first glyph is not named
`.notdef', */
/* then for Type~1 and Type~42 fonts, `.notdef' will be moved
into */
/* the glyph ID~0 position, and whatever was there will be moved to
*/
/* the position `.notdef' had. For Type~1 fonts, if there is no
*/
/* `.notdef' glyph at all, then one will be created at index~0
and */
/* whatever was there will be moved to the last index -- Type~42
*/
/* fonts are considered invalid under this condition.
*/
/*
*/
FT_EXPORT( FT_UInt )
FT_Get_Char_Index( FT_Face face,
FT_ULong charcode );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_First_Char
*/
/*
*/
/* <Description>
*/
/* Return the first character code in the current charmap of a given
*/
/* face, together with its corresponding glyph index.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Output>
*/
/* agindex :: Glyph index of first character code. 0~if charmap is
*/
/* empty.
*/
/*
*/
/* <Return>
*/
/* The charmap's first character code.
*/
/*
*/
/* <Note>
*/
/* You should use this function together with @FT_Get_Next_Char to
*/
/* parse all character codes available in a given charmap. The code
*/
/* should look like this:
*/
/*
*/
/* {
*/
/* FT_ULong charcode;
*/
/* FT_UInt gindex;
*/
/*
*/
/*
*/
/* charcode = FT_Get_First_Char( face, &gindex );
*/
/* while ( gindex != 0 )
*/
/* {
*/
/* ... do something with (charcode,gindex) pair ...
*/
/*
*/
/* charcode = FT_Get_Next_Char( face, charcode, &gindex );
*/
/* }
*/
/* }
*/
/*
*/
/* Be aware that character codes can have values up to 0xFFFFFFFF;
*/
/* this might happen for non-Unicode or malformed cmaps. However,
*/
/* even with regular Unicode encoding, so-called `last resort
fonts' */
/* (using SFNT cmap format 13, see function @FT_Get_CMap_Format)
*/
/* normally have entries for all Unicode characters up to 0x1FFFFF,
*/
/* which can cause *a lot* of iterations.
*/
/*
*/
/* Note that `*agindex' is set to~0 if the charmap is empty. The
*/
/* result itself can be~0 in two cases: if the charmap is empty or
*/
/* if the value~0 is the first valid character code.
*/
/*
*/
FT_EXPORT( FT_ULong )
FT_Get_First_Char( FT_Face face,
FT_UInt *agindex );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Next_Char
*/
/*
*/
/* <Description>
*/
/* Return the next character code in the current charmap of a given
*/
/* face following the value `char_code', as well as the
corresponding */
/* glyph index.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* char_code :: The starting character code.
*/
/*
*/
/* <Output>
*/
/* agindex :: Glyph index of next character code. 0~if charmap
*/
/* is empty.
*/
/*
*/
/* <Return>
*/
/* The charmap's next character code.
*/
/*
*/
/* <Note>
*/
/* You should use this function with @FT_Get_First_Char to walk
*/
/* over all character codes available in a given charmap. See the
*/
/* note for that function for a simple code example.
*/
/*
*/
/* Note that `*agindex' is set to~0 when there are no more codes
in */
/* the charmap.
*/
/*
*/
FT_EXPORT( FT_ULong )
FT_Get_Next_Char( FT_Face face,
FT_ULong char_code,
FT_UInt *agindex );
/*************************************************************************
*
* @function:
* FT_Face_Properties
*
* @description:
* Set or override certain (library or module-wide) properties on a
* face-by-face basis. Useful for finer-grained control and avoiding
* locks on shared structures (threads can modify their own faces as
* they see fit).
*
* Contrary to @FT_Property_Set, this function uses @FT_Parameter so
* that you can pass multiple properties to the target face in one
call.
* Note that only a subset of the available properties can be
* controlled.
*
* * Stem darkening (@FT_PARAM_TAG_STEM_DARKENING, corresponding to the
* property `no-stem-darkening' provided by the `autofit'
and `cff'
* modules; see @no-stem-darkening[autofit] and
* @no-stem-darkening[cff]).
*
* * LCD filter weights (@FT_PARAM_TAG_LCD_FILTER_WEIGHTS,
corresponding
* to function @FT_Library_SetLcdFilterWeights).
*
* * Seed value for the CFF `random' operator
* (@FT_PARAM_TAG_RANDOM_SEED, corresponding to the
`random-seed'
* property provided by the `cff' module; see @random-seed).
*
* Pass NULL as `data' in @FT_Parameter for a given tag to reset
the
* option and use the library or module default again.
*
* @input:
* face ::
* A handle to the source face object.
*
* num_properties ::
* The number of properties that follow.
*
* properties ::
* A handle to an @FT_Parameter array with `num_properties'
elements.
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* Here an example that sets three properties. You must define
* FT_CONFIG_OPTION_SUBPIXEL_RENDERING to make the LCD filter examples
* work.
*
* {
* FT_Parameter property1;
* FT_Bool darken_stems = 1;
*
* FT_Parameter property2;
* FT_LcdFiveTapFilter custom_weight =
* { 0x11, 0x44, 0x56, 0x44, 0x11 };
*
* FT_Parameter property3;
* FT_Int32 random_seed = 314159265;
*
* FT_Parameter properties[3] = { property1,
* property2,
* property3 };
*
*
* property1.tag = FT_PARAM_TAG_STEM_DARKENING;
* property1.data = &darken_stems;
*
* property2.tag = FT_PARAM_TAG_LCD_FILTER_WEIGHTS;
* property2.data = custom_weight;
*
* property3.tag = FT_PARAM_TAG_RANDOM_SEED;
* property3.data = &random_seed;
*
* FT_Face_Properties( face, 3, properties );
* }
*
* The next example resets a single property to its default value.
*
* {
* FT_Parameter property;
*
*
* property.tag = FT_PARAM_TAG_LCD_FILTER_WEIGHTS;
* property.data = NULL;
*
* FT_Face_Properties( face, 1, &property );
* }
*
*/
FT_EXPORT( FT_Error )
FT_Face_Properties( FT_Face face,
FT_UInt num_properties,
FT_Parameter* properties );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_Name_Index
*/
/*
*/
/* <Description>
*/
/* Return the glyph index of a given glyph name.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* glyph_name :: The glyph name.
*/
/*
*/
/* <Return>
*/
/* The glyph index. 0~means `undefined character code'.
*/
/*
*/
FT_EXPORT( FT_UInt )
FT_Get_Name_Index( FT_Face face,
FT_String* glyph_name );
/*************************************************************************
*
* @macro:
* FT_SUBGLYPH_FLAG_XXX
*
* @description:
* A list of constants describing subglyphs. Please refer to the
* `glyf' table description in the OpenType specification for the
* meaning of the various flags (which get synthesized for
* non-OpenType subglyphs).
*
* @values:
* FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS ::
* FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES ::
* FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID ::
* FT_SUBGLYPH_FLAG_SCALE ::
* FT_SUBGLYPH_FLAG_XY_SCALE ::
* FT_SUBGLYPH_FLAG_2X2 ::
* FT_SUBGLYPH_FLAG_USE_MY_METRICS ::
*
*/
#define FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS 1
#define FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES 2
#define FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID 4
#define FT_SUBGLYPH_FLAG_SCALE 8
#define FT_SUBGLYPH_FLAG_XY_SCALE 0x40
#define FT_SUBGLYPH_FLAG_2X2 0x80
#define FT_SUBGLYPH_FLAG_USE_MY_METRICS 0x200
/*************************************************************************
*
* @func:
* FT_Get_SubGlyph_Info
*
* @description:
* Retrieve a description of a given subglyph. Only use it if
* `glyph->format' is @FT_GLYPH_FORMAT_COMPOSITE; an error is
* returned otherwise.
*
* @input:
* glyph ::
* The source glyph slot.
*
* sub_index ::
* The index of the subglyph. Must be less than
* `glyph->num_subglyphs'.
*
* @output:
* p_index ::
* The glyph index of the subglyph.
*
* p_flags ::
* The subglyph flags, see @FT_SUBGLYPH_FLAG_XXX.
*
* p_arg1 ::
* The subglyph's first argument (if any).
*
* p_arg2 ::
* The subglyph's second argument (if any).
*
* p_transform ::
* The subglyph transformation (if any).
*
* @return:
* FreeType error code. 0~means success.
*
* @note:
* The values of `*p_arg1', `*p_arg2', and
`*p_transform' must be
* interpreted depending on the flags returned in `*p_flags'. See
the
* OpenType specification for details.
*
*/
FT_EXPORT( FT_Error )
FT_Get_SubGlyph_Info( FT_GlyphSlot glyph,
FT_UInt sub_index,
FT_Int *p_index,
FT_UInt *p_flags,
FT_Int *p_arg1,
FT_Int *p_arg2,
FT_Matrix *p_transform );
/*************************************************************************/
/*
*/
/* <Enum>
*/
/* FT_FSTYPE_XXX
*/
/*
*/
/* <Description>
*/
/* A list of bit flags used in the `fsType' field of the OS/2
table */
/* in a TrueType or OpenType font and the `FSType' entry in a
*/
/* PostScript font. These bit flags are returned by
*/
/* @FT_Get_FSType_Flags; they inform client applications of embedding
*/
/* and subsetting restrictions associated with a font.
*/
/*
*/
/* See
*/
/*
http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf
*/
/* for more details.
*/
/*
*/
/* <Values>
*/
/* FT_FSTYPE_INSTALLABLE_EMBEDDING ::
*/
/* Fonts with no fsType bit set may be embedded and permanently
*/
/* installed on the remote system by an application.
*/
/*
*/
/* FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING ::
*/
/* Fonts that have only this bit set must not be modified, embedded
*/
/* or exchanged in any manner without first obtaining permission of
*/
/* the font software copyright owner.
*/
/*
*/
/* FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING ::
*/
/* The font may be embedded and temporarily loaded on the remote
*/
/* system. Documents containing Preview & Print fonts must be
*/
/* opened `read-only'; no edits can be applied to the document.
*/
/*
*/
/* FT_FSTYPE_EDITABLE_EMBEDDING ::
*/
/* The font may be embedded but must only be installed temporarily
*/
/* on other systems. In contrast to Preview & Print fonts,
*/
/* documents containing editable fonts may be opened for reading,
*/
/* editing is permitted, and changes may be saved.
*/
/*
*/
/* FT_FSTYPE_NO_SUBSETTING ::
*/
/* The font may not be subsetted prior to embedding.
*/
/*
*/
/* FT_FSTYPE_BITMAP_EMBEDDING_ONLY ::
*/
/* Only bitmaps contained in the font may be embedded; no outline
*/
/* data may be embedded. If there are no bitmaps available in the
*/
/* font, then the font is unembeddable.
*/
/*
*/
/* <Note>
*/
/* The flags are ORed together, thus more than a single value can be
*/
/* returned.
*/
/*
*/
/* While the `fsType' flags can indicate that a font may be
embedded, */
/* a license with the font vendor may be separately required to use
*/
/* the font in this way.
*/
/*
*/
#define FT_FSTYPE_INSTALLABLE_EMBEDDING 0x0000
#define FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING 0x0002
#define FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING 0x0004
#define FT_FSTYPE_EDITABLE_EMBEDDING 0x0008
#define FT_FSTYPE_NO_SUBSETTING 0x0100
#define FT_FSTYPE_BITMAP_EMBEDDING_ONLY 0x0200
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Get_FSType_Flags
*/
/*
*/
/* <Description>
*/
/* Return the `fsType' flags for a font.
*/
/*
*/
/* <Input>
*/
/* face :: A handle to the source face object.
*/
/*
*/
/* <Return>
*/
/* The `fsType' flags, see @FT_FSTYPE_XXX.
*/
/*
*/
/* <Note>
*/
/* Use this function rather than directly reading the `fs_type'
field */
/* in the @PS_FontInfoRec structure, which is only guaranteed to
*/
/* return the correct results for Type~1 fonts.
*/
/*
*/
/* <Since>
*/
/* 2.3.8
*/
/*
*/
FT_EXPORT( FT_UShort )
FT_Get_FSType_Flags( FT_Face face );
/*************************************************************************/
/*
*/
/* <Section>
*/
/* glyph_variants
*/
/*
*/
/* <Title>
*/
/* Unicode Variation Sequences
*/
/*
*/
/* <Abstract>
*/
/* The FreeType~2 interface to Unicode Variation Sequences (UVS),
*/
/* using the SFNT cmap format~14.
*/
/*
*/
/* <Description>
*/
/* Many characters, especially for CJK scripts, have variant forms.
*/
/* They are a sort of grey area somewhere between being totally
*/
/* irrelevant and semantically distinct; for this reason, the Unicode
*/
/* consortium decided to introduce Variation Sequences (VS),
*/
/* consisting of a Unicode base character and a variation selector
*/
/* instead of further extending the already huge number of
*/
/* characters.
*/
/*
*/
/* Unicode maintains two different sets, namely `Standardized
*/
/* Variation Sequences' and registered `Ideographic Variation
*/
/* Sequences' (IVS), collected in the `Ideographic Variation
*/
/* Database' (IVD).
*/
/*
*/
/* http://unicode.org/Public/UCD/latest/ucd/StandardizedVariants.txt
*/
/* http://unicode.org/reports/tr37/
*/
/* http://unicode.org/ivd/
*/
/*
*/
/* To date (January 2017), the character with the most ideographic
*/
/* variations is U+9089, having 32 such IVS.
*/
/*
*/
/* Three Mongolian Variation Selectors have the values U+180B-U+180D;
*/
/* 256 generic Variation Selectors are encoded in the ranges
*/
/* U+FE00-U+FE0F and U+E0100-U+E01EF. IVS currently use Variation
*/
/* Selectors from the range U+E0100-U+E01EF only.
*/
/*
*/
/* A VS consists of the base character value followed by a single
*/
/* Variation Selector. For example, to get the first variation of
*/
/* U+9089, you have to write the character sequence `U+9089
U+E0100'. */
/*
*/
/* Adobe and MS decided to support both standardized and ideographic
*/
/* VS with a new cmap subtable (format~14). It is an odd subtable
*/
/* because it is not a mapping of input code points to glyphs, but
*/
/* contains lists of all variations supported by the font.
*/
/*
*/
/* A variation may be either `default' or `non-default' for
a given */
/* font. A default variation is the one you will get for that code
*/
/* point if you look it up in the standard Unicode cmap. A
*/
/* non-default variation is a different glyph.
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_GetCharVariantIndex
*/
/*
*/
/* <Description>
*/
/* Return the glyph index of a given character code as modified by
*/
/* the variation selector.
*/
/*
*/
/* <Input>
*/
/* face ::
*/
/* A handle to the source face object.
*/
/*
*/
/* charcode ::
*/
/* The character code point in Unicode.
*/
/*
*/
/* variantSelector ::
*/
/* The Unicode code point of the variation selector.
*/
/*
*/
/* <Return>
*/
/* The glyph index. 0~means either `undefined character code',
or */
/* `undefined selector code', or `no variation selector cmap
*/
/* subtable', or `current CharMap is not Unicode'.
*/
/*
*/
/* <Note>
*/
/* If you use FreeType to manipulate the contents of font files
*/
/* directly, be aware that the glyph index returned by this function
*/
/* doesn't always correspond to the internal indices used within
*/
/* the file. This is done to ensure that value~0 always corresponds
*/
/* to the `missing glyph'.
*/
/*
*/
/* This function is only meaningful if
*/
/* a) the font has a variation selector cmap sub table,
*/
/* and
*/
/* b) the current charmap has a Unicode encoding.
*/
/*
*/
/* <Since>
*/
/* 2.3.6
*/
/*
*/
FT_EXPORT( FT_UInt )
FT_Face_GetCharVariantIndex( FT_Face face,
FT_ULong charcode,
FT_ULong variantSelector );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_GetCharVariantIsDefault
*/
/*
*/
/* <Description>
*/
/* Check whether this variation of this Unicode character is the one
*/
/* to be found in the `cmap'.
*/
/*
*/
/* <Input>
*/
/* face ::
*/
/* A handle to the source face object.
*/
/*
*/
/* charcode ::
*/
/* The character codepoint in Unicode.
*/
/*
*/
/* variantSelector ::
*/
/* The Unicode codepoint of the variation selector.
*/
/*
*/
/* <Return>
*/
/* 1~if found in the standard (Unicode) cmap, 0~if found in the
*/
/* variation selector cmap, or -1 if it is not a variation.
*/
/*
*/
/* <Note>
*/
/* This function is only meaningful if the font has a variation
*/
/* selector cmap subtable.
*/
/*
*/
/* <Since>
*/
/* 2.3.6
*/
/*
*/
FT_EXPORT( FT_Int )
FT_Face_GetCharVariantIsDefault( FT_Face face,
FT_ULong charcode,
FT_ULong variantSelector );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_GetVariantSelectors
*/
/*
*/
/* <Description>
*/
/* Return a zero-terminated list of Unicode variation selectors found
*/
/* in the font.
*/
/*
*/
/* <Input>
*/
/* face ::
*/
/* A handle to the source face object.
*/
/*
*/
/* <Return>
*/
/* A pointer to an array of selector code points, or NULL if there is
*/
/* no valid variation selector cmap subtable.
*/
/*
*/
/* <Note>
*/
/* The last item in the array is~0; the array is owned by the
*/
/* @FT_Face object but can be overwritten or released on the next
*/
/* call to a FreeType function.
*/
/*
*/
/* <Since>
*/
/* 2.3.6
*/
/*
*/
FT_EXPORT( FT_UInt32* )
FT_Face_GetVariantSelectors( FT_Face face );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_GetVariantsOfChar
*/
/*
*/
/* <Description>
*/
/* Return a zero-terminated list of Unicode variation selectors found
*/
/* for the specified character code.
*/
/*
*/
/* <Input>
*/
/* face ::
*/
/* A handle to the source face object.
*/
/*
*/
/* charcode ::
*/
/* The character codepoint in Unicode.
*/
/*
*/
/* <Return>
*/
/* A pointer to an array of variation selector code points that are
*/
/* active for the given character, or NULL if the corresponding list
*/
/* is empty.
*/
/*
*/
/* <Note>
*/
/* The last item in the array is~0; the array is owned by the
*/
/* @FT_Face object but can be overwritten or released on the next
*/
/* call to a FreeType function.
*/
/*
*/
/* <Since>
*/
/* 2.3.6
*/
/*
*/
FT_EXPORT( FT_UInt32* )
FT_Face_GetVariantsOfChar( FT_Face face,
FT_ULong charcode );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_GetCharsOfVariant
*/
/*
*/
/* <Description>
*/
/* Return a zero-terminated list of Unicode character codes found for
*/
/* the specified variation selector.
*/
/*
*/
/* <Input>
*/
/* face ::
*/
/* A handle to the source face object.
*/
/*
*/
/* variantSelector ::
*/
/* The variation selector code point in Unicode.
*/
/*
*/
/* <Return>
*/
/* A list of all the code points that are specified by this selector
*/
/* (both default and non-default codes are returned) or NULL if there
*/
/* is no valid cmap or the variation selector is invalid.
*/
/*
*/
/* <Note>
*/
/* The last item in the array is~0; the array is owned by the
*/
/* @FT_Face object but can be overwritten or released on the next
*/
/* call to a FreeType function.
*/
/*
*/
/* <Since>
*/
/* 2.3.6
*/
/*
*/
FT_EXPORT( FT_UInt32* )
FT_Face_GetCharsOfVariant( FT_Face face,
FT_ULong variantSelector );
/*************************************************************************/
/*
*/
/* <Section>
*/
/* computations
*/
/*
*/
/* <Title>
*/
/* Computations
*/
/*
*/
/* <Abstract>
*/
/* Crunching fixed numbers and vectors.
*/
/*
*/
/* <Description>
*/
/* This section contains various functions used to perform
*/
/* computations on 16.16 fixed-float numbers or 2d vectors.
*/
/*
*/
/* <Order>
*/
/* FT_MulDiv
*/
/* FT_MulFix
*/
/* FT_DivFix
*/
/* FT_RoundFix
*/
/* FT_CeilFix
*/
/* FT_FloorFix
*/
/* FT_Vector_Transform
*/
/* FT_Matrix_Multiply
*/
/* FT_Matrix_Invert
*/
/*
*/
/*************************************************************************/
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_MulDiv
*/
/*
*/
/* <Description>
*/
/* Compute `(a*b)/c' with maximum accuracy, using a 64-bit
*/
/* intermediate integer whenever necessary.
*/
/*
*/
/* This function isn't necessarily as fast as some processor
specific */
/* operations, but is at least completely portable.
*/
/*
*/
/* <Input>
*/
/* a :: The first multiplier.
*/
/*
*/
/* b :: The second multiplier.
*/
/*
*/
/* c :: The divisor.
*/
/*
*/
/* <Return>
*/
/* The result of `(a*b)/c'. This function never traps when
trying to */
/* divide by zero; it simply returns `MaxInt' or `MinInt'
depending */
/* on the signs of `a' and `b'.
*/
/*
*/
FT_EXPORT( FT_Long )
FT_MulDiv( FT_Long a,
FT_Long b,
FT_Long c );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_MulFix
*/
/*
*/
/* <Description>
*/
/* Compute `(a*b)/0x10000' with maximum accuracy. Its main use
is to */
/* multiply a given value by a 16.16 fixed-point factor.
*/
/*
*/
/* <Input>
*/
/* a :: The first multiplier.
*/
/*
*/
/* b :: The second multiplier. Use a 16.16 factor here whenever
*/
/* possible (see note below).
*/
/*
*/
/* <Return>
*/
/* The result of `(a*b)/0x10000'.
*/
/*
*/
/* <Note>
*/
/* This function has been optimized for the case where the absolute
*/
/* value of `a' is less than 2048, and `b' is a 16.16
scaling factor. */
/* As this happens mainly when scaling from notional units to
*/
/* fractional pixels in FreeType, it resulted in noticeable speed
*/
/* improvements between versions 2.x and 1.x.
*/
/*
*/
/* As a conclusion, always try to place a 16.16 factor as the
*/
/* _second_ argument of this function; this can make a great
*/
/* difference.
*/
/*
*/
FT_EXPORT( FT_Long )
FT_MulFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_DivFix
*/
/*
*/
/* <Description>
*/
/* Compute `(a*0x10000)/b' with maximum accuracy. Its main use
is to */
/* divide a given value by a 16.16 fixed-point factor.
*/
/*
*/
/* <Input>
*/
/* a :: The numerator.
*/
/*
*/
/* b :: The denominator. Use a 16.16 factor here.
*/
/*
*/
/* <Return>
*/
/* The result of `(a*0x10000)/b'.
*/
/*
*/
FT_EXPORT( FT_Long )
FT_DivFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_RoundFix
*/
/*
*/
/* <Description>
*/
/* Round a 16.16 fixed number.
*/
/*
*/
/* <Input>
*/
/* a :: The number to be rounded.
*/
/*
*/
/* <Return>
*/
/* `a' rounded to the nearest 16.16 fixed integer, halfway cases
away */
/* from zero.
*/
/*
*/
FT_EXPORT( FT_Fixed )
FT_RoundFix( FT_Fixed a );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_CeilFix
*/
/*
*/
/* <Description>
*/
/* Compute the smallest following integer of a 16.16 fixed number.
*/
/*
*/
/* <Input>
*/
/* a :: The number for which the ceiling function is to be computed.
*/
/*
*/
/* <Return>
*/
/* `a' rounded towards plus infinity.
*/
/*
*/
FT_EXPORT( FT_Fixed )
FT_CeilFix( FT_Fixed a );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_FloorFix
*/
/*
*/
/* <Description>
*/
/* Compute the largest previous integer of a 16.16 fixed number.
*/
/*
*/
/* <Input>
*/
/* a :: The number for which the floor function is to be computed.
*/
/*
*/
/* <Return>
*/
/* `a' rounded towards minus infinity.
*/
/*
*/
FT_EXPORT( FT_Fixed )
FT_FloorFix( FT_Fixed a );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Vector_Transform
*/
/*
*/
/* <Description>
*/
/* Transform a single vector through a 2x2 matrix.
*/
/*
*/
/* <InOut>
*/
/* vector :: The target vector to transform.
*/
/*
*/
/* <Input>
*/
/* matrix :: A pointer to the source 2x2 matrix.
*/
/*
*/
/* <Note>
*/
/* The result is undefined if either `vector' or `matrix' is
invalid. */
/*
*/
FT_EXPORT( void )
FT_Vector_Transform( FT_Vector* vec,
const FT_Matrix* matrix );
/*************************************************************************/
/*
*/
/* <Section>
*/
/* version
*/
/*
*/
/* <Title>
*/
/* FreeType Version
*/
/*
*/
/* <Abstract>
*/
/* Functions and macros related to FreeType versions.
*/
/*
*/
/* <Description>
*/
/* Note that those functions and macros are of limited use because
*/
/* even a new release of FreeType with only documentation changes
*/
/* increases the version number.
*/
/*
*/
/* <Order>
*/
/* FT_Library_Version
*/
/*
*/
/* FREETYPE_MAJOR
*/
/* FREETYPE_MINOR
*/
/* FREETYPE_PATCH
*/
/*
*/
/* FT_Face_CheckTrueTypePatents
*/
/* FT_Face_SetUnpatentedHinting
*/
/*
*/
/* FREETYPE_XXX
*/
/*
*/
/*************************************************************************/
/*************************************************************************
*
* @enum:
* FREETYPE_XXX
*
* @description:
* These three macros identify the FreeType source code version.
* Use @FT_Library_Version to access them at runtime.
*
* @values:
* FREETYPE_MAJOR :: The major version number.
* FREETYPE_MINOR :: The minor version number.
* FREETYPE_PATCH :: The patch level.
*
* @note:
* The version number of FreeType if built as a dynamic link library
* with the `libtool' package is _not_ controlled by these three
* macros.
*
*/
#define FREETYPE_MAJOR 2
#define FREETYPE_MINOR 8
#define FREETYPE_PATCH 0
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Library_Version
*/
/*
*/
/* <Description>
*/
/* Return the version of the FreeType library being used. This is
*/
/* useful when dynamically linking to the library, since one cannot
*/
/* use the macros @FREETYPE_MAJOR, @FREETYPE_MINOR, and
*/
/* @FREETYPE_PATCH.
*/
/*
*/
/* <Input>
*/
/* library :: A source library handle.
*/
/*
*/
/* <Output>
*/
/* amajor :: The major version number.
*/
/*
*/
/* aminor :: The minor version number.
*/
/*
*/
/* apatch :: The patch version number.
*/
/*
*/
/* <Note>
*/
/* The reason why this function takes a `library' argument is
because */
/* certain programs implement library initialization in a custom way
*/
/* that doesn't use @FT_Init_FreeType.
*/
/*
*/
/* In such cases, the library version might not be available before
*/
/* the library object has been created.
*/
/*
*/
FT_EXPORT( void )
FT_Library_Version( FT_Library library,
FT_Int *amajor,
FT_Int *aminor,
FT_Int *apatch );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_CheckTrueTypePatents
*/
/*
*/
/* <Description>
*/
/* Deprecated, does nothing.
*/
/*
*/
/* <Input>
*/
/* face :: A face handle.
*/
/*
*/
/* <Return>
*/
/* Always returns false.
*/
/*
*/
/* <Note>
*/
/* Since May 2010, TrueType hinting is no longer patented.
*/
/*
*/
/* <Since>
*/
/* 2.3.5
*/
/*
*/
FT_EXPORT( FT_Bool )
FT_Face_CheckTrueTypePatents( FT_Face face );
/*************************************************************************/
/*
*/
/* <Function>
*/
/* FT_Face_SetUnpatentedHinting
*/
/*
*/
/* <Description>
*/
/* Deprecated, does nothing.
*/
/*
*/
/* <Input>
*/
/* face :: A face handle.
*/
/*
*/
/* value :: New boolean setting.
*/
/*
*/
/* <Return>
*/
/* Always returns false.
*/
/*
*/
/* <Note>
*/
/* Since May 2010, TrueType hinting is no longer patented.
*/
/*
*/
/* <Since>
*/
/* 2.3.5
*/
/*
*/
FT_EXPORT( FT_Bool )
FT_Face_SetUnpatentedHinting( FT_Face face,
FT_Bool value );
/* */
FT_END_HEADER
#endif /* FREETYPE_H_ */
/* END */