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freetype2/include/freetype/freetype.h

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/***************************************************************************/
/* */
/* freetype.h */
/* */
/* FreeType high-level API and common types (specification only). */
/* */
/* Copyright 1996-2001, 2002, 2003, 2004, 2005 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 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
#ifndef __FREETYPE_H__
#define __FREETYPE_H__
/*************************************************************************/
/* */
/* The `raster' component duplicates some of the declarations in */
/* freetype.h for stand-alone use if _FREETYPE_ isn't defined. */
/* */
/*************************************************************************/
/* */
/* The FREETYPE_MAJOR and FREETYPE_MINOR macros are used to version the */
/* new FreeType design, which is able to host several kinds of font */
/* drivers. It starts at 2.0. */
/* */
#define FREETYPE_MAJOR 2
#define FREETYPE_MINOR 2
#define FREETYPE_PATCH 0
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_ERRORS_H
#include FT_TYPES_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <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. With */
/* 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 public high-level API of FreeType 2. */
/* */
/* <Order> */
/* FT_Library */
/* FT_Face */
/* FT_Size */
/* FT_GlyphSlot */
/* FT_CharMap */
/* FT_Encoding */
/* */
/* 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_SFNT */
/* FT_FACE_FLAG_KERNING */
/* FT_FACE_FLAG_MULTIPLE_MASTERS */
/* FT_FACE_FLAG_GLYPH_NAMES */
/* FT_FACE_FLAG_EXTERNAL_STREAM */
/* FT_FACE_FLAG_FAST_GLYPHS */
/* FT_FACE_FLAG_HINTER */
/* */
/* 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_Library_Version */
/* */
/* FT_New_Face */
/* FT_Done_Face */
/* FT_New_Memory_Face */
/* FT_Open_Face */
/* FT_Open_Args */
/* FT_Parameter */
/* FT_Attach_File */
/* FT_Attach_Stream */
/* */
/* FT_Set_Char_Size */
/* FT_Set_Pixel_Sizes */
/* FT_Set_Transform */
/* FT_Load_Glyph */
/* FT_Get_Char_Index */
/* 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_CROP_BITMAP */
/* */
/* FT_LOAD_VERTICAL_LAYOUT */
/* FT_LOAD_IGNORE_TRANSFORM */
/* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */
/* 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_Render_Glyph */
/* FT_Render_Mode */
/* FT_Get_Kerning */
/* FT_Kerning_Mode */
/* FT_Get_Glyph_Name */
/* FT_Get_Postscript_Name */
/* */
/* FT_CharMapRec */
/* FT_Select_Charmap */
/* FT_Set_Charmap */
/* FT_Get_Charmap_Index */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Glyph_Metrics */
/* */
/* <Description> */
/* A structure used 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 is used, values are returned 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. */
/* */
/* vertAdvance :: */
/* Advance height for vertical layout. */
/* */
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 size of a bitmap strike (i.e., a bitmap */
/* instance of the font for a given resolution) in a fixed-size font */
/* face. It is used for the `available_sizes' field of the */
/* @FT_FaceRec structure. */
/* */
/* <Fields> */
/* height :: The (vertical) baseline-to-baseline distance in pixels. */
/* It makes most sense to define the height of a bitmap */
/* font in this way. */
/* */
/* width :: The average width of the font (in pixels). Since the */
/* algorithms to compute this value are different for the */
/* various bitmap formats, it can only give an additional */
/* hint if the `height' value isn't sufficient to select */
/* the proper font. For monospaced fonts the average width */
/* is the same as the maximum width. */
/* */
/* size :: The point size in 26.6 fractional format this font shall */
/* represent (for a given vertical resolution). */
/* */
/* x_ppem :: The horizontal ppem value (in 26.6 fractional format). */
/* */
/* y_ppem :: The vertical ppem value (in 26.6 fractional format). */
/* Usually, this is the `nominal' pixel height of the font. */
/* */
/* <Note> */
/* The values in this structure are taken from the bitmap font. If */
/* the font doesn't provide a parameter it is set to zero to indicate */
/* that the information is not available. */
/* */
/* The following formula converts from dpi to ppem: */
/* */
/* ppem = size * dpi / 72 */
/* */
/* where `size' is in points. */
/* */
/* Windows FNT: */
/* The `size' parameter is not reliable: There exist fonts (e.g., */
/* app850.fon) which have a wrong size for some subfonts; x_ppem */
/* and y_ppem are thus set equal to pixel width and height given in */
/* in the Windows FNT header. */
/* */
/* 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). */
/* */
/* For multi-threading applications each thread should have its own */
/* FT_Library object. */
/* */
/* <Note> */
/* Library objects are normally created by @FT_Init_FreeType, and */
/* destroyed with @FT_Done_FreeType. */
/* */
typedef struct FT_LibraryRec_ *FT_Library;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Module */
/* */
/* <Description> */
/* A handle to a given FreeType module object. Each module can be a */
/* font driver, a renderer, or anything else that provides services */
/* to the formers. */
/* */
typedef struct FT_ModuleRec_* FT_Module;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Driver */
/* */
/* <Description> */
/* A handle to a given FreeType font driver object. Each font driver */
/* is a special 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 special */
/* module in charge of converting a glyph image to a bitmap, when */
/* necessary. Each renderer supports a given glyph image format, and */
/* one or more target surface depths. */
/* */
typedef struct FT_RendererRec_* FT_Renderer;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Face */
/* */
/* <Description> */
/* A handle to a given typographic face object. A face object models */
/* a given typeface, in a given style. */
/* */
/* <Note> */
/* Each 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 filepathname or a custom input stream. */
/* */
/* Use @FT_Done_Face to destroy it (along with its slot and sizes). */
/* */
/* <Also> */
/* The @FT_FaceRec details the publicly accessible fields of a given */
/* face object. */
/* */
typedef struct FT_FaceRec_* FT_Face;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Size */
/* */
/* <Description> */
/* A handle to a given size object. Such an object models the data */
/* that depends on the current _resolution_ and _character size_ in a */
/* given @FT_Face. */
/* */
/* <Note> */
/* Each face object owns one or more sizes. There is however a */
/* single _active_ size for the face at any time that is used by */
/* functions like @FT_Load_Glyph, @FT_Get_Kerning, etc. */
/* */
/* You can use the @FT_Activate_Size API to change the current */
/* active size of any given face. */
/* */
/* <Also> */
/* The @FT_SizeRec structure details the publicly accessible fields */
/* of a given face object. */
/* */
typedef struct FT_SizeRec_* FT_Size;
/*************************************************************************/
/* */
/* <Type> */
/* FT_GlyphSlot */
/* */
/* <Description> */
/* A handle to a given `glyph slot'. A slot is a container where it */
/* is possible to load any one 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> */
/* @FT_GlyphSlotRec details the publicly accessible glyph fields. */
/* */
typedef struct FT_GlyphSlotRec_* FT_GlyphSlot;
/*************************************************************************/
/* */
/* <Type> */
/* FT_CharMap */
/* */
/* <Description> */
/* A handle to a given character map. 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" and 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> */
/* The @FT_CharMapRec details 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 16bit compilers don't like 32bit 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 used to specify encodings supported by charmaps. */
/* Used in the @FT_Select_Charmap API function. */
/* */
/* <Note> */
/* Because of 32-bit charcodes defined in Unicode (i.e., surrogates), */
/* all character codes must be expressed as FT_Longs. */
/* */
/* The values of this type correspond to specific character */
/* repertories (i.e. charsets), and not to text encoding methods */
/* (like UTF-8, UTF-16, GB2312_EUC, etc.). */
/* */
/* Other encodings might be defined in the future. */
/* */
/* <Values> */
/* FT_ENCODING_NONE :: */
/* The encoding value 0 is reserved. */
/* */
/* FT_ENCODING_UNICODE :: */
/* Corresponds to 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. */
/* */
/* FT_ENCODING_MS_SYMBOL :: */
/* Corresponds to the Microsoft Symbol encoding, used to encode */
/* mathematical symbols in the 32..255 character code range. For */
/* more information, see `http://www.ceviz.net/symbol.htm'. */
/* */
/* FT_ENCODING_SJIS :: */
/* Corresponds to Japanese SJIS encoding. More info at */
/* at `http://langsupport.japanreference.com/encoding.shtml'. */
/* See note on multi-byte encodings below. */
/* */
/* FT_ENCODING_GB2312 :: */
/* Corresponds to an encoding system for Simplified Chinese as used */
/* used in mainland China. */
/* */
/* 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 Wansung. */
/* For more information see */
/* `http://www.microsoft.com/typography/unicode/949.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 Hangeul 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 :: */
/* Corresponds to the Adobe Standard encoding, as found in Type 1, */
/* CFF, and OpenType/CFF fonts. It is limited to 256 character */
/* codes. */
/* */
/* FT_ENCODING_ADOBE_EXPERT :: */
/* Corresponds to the 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 :: */
/* Corresponds to the 8-bit Apple roman encoding. Many TrueType and */
/* OpenType fonts contain a charmap for this encoding, since older */
/* versions of Mac OS are able to use it. */
/* */
/* FT_ENCODING_OLD_LATIN_2 :: */
/* This value is deprecated and was never 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_GB2312. 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 synthetizes a Unicode charmap */
/* for Postscript fonts, using their glyph names 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 which 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, */
/* dont 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 backwards 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;
/*************************************************************************/
/* */
/* <Enum> */
/* ft_encoding_xxx */
/* */
/* <Description> */
/* These constants are deprecated; use the corresponding @FT_Encoding */
/* values instead. */
/* */
/* <Values> */
/* ft_encoding_none :: see @FT_ENCODING_NONE */
/* ft_encoding_unicode :: see @FT_ENCODING_UNICODE */
/* ft_encoding_latin_2 :: see @FT_ENCODING_OLD_LATIN_2 */
/* ft_encoding_symbol :: see @FT_ENCODING_MS_SYMBOL */
/* ft_encoding_sjis :: see @FT_ENCODING_SJIS */
/* ft_encoding_gb2312 :: see @FT_ENCODING_GB2312 */
/* ft_encoding_big5 :: see @FT_ENCODING_BIG5 */
/* ft_encoding_wansung :: see @FT_ENCODING_WANSUNG */
/* ft_encoding_johab :: see @FT_ENCODING_JOHAB */
/* */
/* ft_encoding_adobe_standard :: see @FT_ENCODING_ADOBE_STANDARD */
/* ft_encoding_adobe_expert :: see @FT_ENCODING_ADOBE_EXPERT */
/* ft_encoding_adobe_custom :: see @FT_ENCODING_ADOBE_CUSTOM */
/* ft_encoding_latin_1 :: see @FT_ENCODING_ADOBE_LATIN_1 */
/* */
/* ft_encoding_apple_roman :: see @FT_ENCODING_APPLE_ROMAN */
/* */
#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 should be emulated */
/* for other formats. */
/* */
/* encoding_id :: A platform specific encoding number. This also */
/* comes from the TrueType specification and should be */
/* 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, used to */
/* model 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 the */
/* resolution and point-size independent data found in a font file. */
/* */
/* <Fields> */
/* num_faces :: In the case where the face is located in a */
/* collection (i.e., a file which embeds */
/* several faces), this is the total number of */
/* faces found in the resource. 1 by default. */
/* Accessing non-existent face indices causes */
/* an error. */
/* */
/* face_index :: The index of the face in its font file. */
/* Usually, this is 0 for all normal font */
/* formats. It can be > 0 in the case of */
/* collections (which embed several fonts in a */
/* single resource/file). */
/* */
/* face_flags :: A set of bit flags that give important */
/* information about the face; see the */
/* @FT_FACE_FLAG_XXX constants for details. */
/* */
/* style_flags :: A set of bit flags indicating the style of */
/* the face (i.e., italic, bold, underline, */
/* etc). See the @FT_STYLE_FLAG_XXX */
/* constants. */
/* */
/* num_glyphs :: The total number of glyphs in the face. */
/* */
/* family_name :: The face's family name. This is an ASCII */
/* string, usually in English, which 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. */
/* */
/* style_name :: The face's style name. This is an ASCII */
/* string, usually in English, which 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/Unicode versions of this string. */
/* Applications should use the format specific */
/* interface to access them. */
/* */
/* num_fixed_sizes :: The number of fixed sizes available in this */
/* face. This should be set to 0 for scalable */
/* fonts, unless its face includes a set of */
/* glyphs (called a `strike') for the */
/* specified sizes. */
/* */
/* available_sizes :: An array of sizes specifying the available */
/* bitmap/graymap sizes that are contained in */
/* in the font face. Should be set to NULL if */
/* the field `num_fixed_sizes' is set to 0. */
/* */
/* num_charmaps :: The total number of character maps in the */
/* face. */
/* */
/* charmaps :: A table of pointers to the face's charmaps. */
/* Used to scan the list of available charmaps */
/* -- this table might change after a call to */
/* @FT_Attach_File or @FT_Attach_Stream (e.g. */
/* if used to hook an additional encoding or */
/* CMap to the face object). */
/* */
/* 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 `maximal ascender', */
/* bbox.yMin as the `minimal descender', and */
/* the maximal glyph width is given by */
/* `bbox.xMax-bbox.xMin' (not to be confused */
/* with the maximal _advance_width_). Only */
/* relevant for scalable formats. */
/* */
/* units_per_EM :: The number of font units per EM square for */
/* this face. This is typically 2048 for */
/* TrueType fonts, 1000 for Type1 fonts, and */
/* should be set to the (unrealistic) value 1 */
/* for fixed-sizes fonts. Only relevant for */
/* scalable formats. */
/* */
/* ascender :: The face's ascender is the vertical */
/* distance from the baseline to the topmost */
/* point of any glyph in the face. This */
/* field's value is positive, expressed in */
/* font units. Some font designs use a value */
/* different from `bbox.yMax'. Only relevant */
/* for scalable formats. */
/* */
/* descender :: The face's descender is the vertical */
/* distance from the baseline to the */
/* bottommost point of any glyph in the face. */
/* This field's value is *negative* for values */
/* below the baseline. It is expressed in */
/* font units. Some font designs use a value */
/* different from `bbox.yMin'. Only relevant */
/* for scalable formats. */
/* */
/* height :: The face's height is the vertical distance */
/* from one baseline to the next when writing */
/* several lines of text. Its value is always */
/* positive, expressed in font units. The */
/* value can be computed as */
/* `ascender+descender+line_gap' where the */
/* value of `line_gap' is also called */
/* `external leading'. Only relevant for */
/* scalable formats. */
/* */
/* max_advance_width :: The maximal 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 maximal advance height, in font units, */
/* for all glyphs in this face. This is only */
/* relevant for vertical layouts, and should */
/* be set to the `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's 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). This */
/* object is created automatically with a new */
/* face object. However, certain kinds of */
/* applications (mainly tools like converters) */
/* can need more than one slot to ease their */
/* task. */
/* */
/* size :: The current active size for this face. */
/* */
/* charmap :: The current active charmap for this face. */
/* */
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 are only relevant to scalable outlines */
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;
void* extensions;
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 :: */
/* Indicates that the face provides vectorial outlines. This */
/* doesn't prevent embedded bitmaps, i.e., a face can have both */
/* this bit and @FT_FACE_FLAG_FIXED_SIZES set. */
/* */
/* FT_FACE_FLAG_FIXED_SIZES :: */
/* Indicates that the face contains `fixed sizes', i.e., bitmap */
/* strikes for some given pixel sizes. See the `num_fixed_sizes' */
/* and `available_sizes' fields of @FT_FaceRec. */
/* */
/* FT_FACE_FLAG_FIXED_WIDTH :: */
/* Indicates that the face contains fixed-width characters (like */
/* Courier, Lucido, MonoType, etc.). */
/* */
/* FT_FACE_FLAG_SFNT :: */
/* Indicates that the face uses the `sfnt' storage scheme. For */
/* now, this means TrueType and OpenType. */
/* */
/* FT_FACE_FLAG_HORIZONTAL :: */
/* Indicates that the face contains horizontal glyph metrics. This */
/* should be set for all common formats. */
/* */
/* FT_FACE_FLAG_VERTICAL :: */
/* Indicates that the face contains vertical glyph metrics. This */
/* is only available in some formats, not all of them. */
/* */
/* FT_FACE_FLAG_KERNING :: */
/* Indicates that the face contains kerning information. If set, */
/* the kerning distance can be retrieved through the function */
/* @FT_Get_Kerning. Otherwise the function always return the */
/* vector (0,0). Note that FreeType doesn't handle kerning data */
/* from the `GPOS' table (as present in some OpenType fonts). */
/* */
/* FT_FACE_FLAG_FAST_GLYPHS :: */
/* THIS FLAG IS DEPRECATED. DO NOT USE OR TEST IT. */
/* */
/* FT_FACE_FLAG_MULTIPLE_MASTERS :: */
/* Indicates that the font contains multiple masters and is capable */
/* of interpolating between them. See the multiple-masters */
/* specific API for details. */
/* */
/* FT_FACE_FLAG_GLYPH_NAMES :: */
/* Indicates that the font contains glyph names that can be */
/* retrieved through @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 :: */
/* Set if 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. */
/* */
#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 )
/* */
/*************************************************************************/
/* */
/* @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 vertical */
/* metrics. */
/* */
#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, CID, and */
/* OpenType/CFF 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; indicates that the face contains so-called "fast" */
/* glyph bitmaps. */
/* */
#define FT_HAS_FAST_GLYPHS( face ) \
( face->face_flags & FT_FACE_FLAG_FAST_GLYPHS )
/*************************************************************************/
/* */
/* @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 )
/*************************************************************************/
/* */
/* <Constant> */
/* FT_STYLE_FLAG_XXX */
/* */
/* <Description> */
/* A list of bit-flags used to indicate the style of a given face. */
/* These are used in the `style_flags' field of @FT_FaceRec. */
/* */
/* <Values> */
/* FT_STYLE_FLAG_ITALIC :: */
/* Indicates that a given face is italicized. */
/* */
/* FT_STYLE_FLAG_BOLD :: */
/* Indicates that a given face is bold. */
/* */
#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 returned scaled important distances for */
/* a given size object. */
/* */
/* <Fields> */
/* x_ppem :: The character width, expressed in integer pixels. */
/* This is the width of the EM square expressed in */
/* pixels, hence the term `ppem' (pixels per EM). */
/* */
/* y_ppem :: The character height, expressed in integer pixels. */
/* This is the height of the EM square expressed in */
/* pixels, hence the term `ppem' (pixels per EM). */
/* */
/* x_scale :: A simple 16.16 fixed point format coefficient used */
/* to scale horizontal distances expressed in font */
/* units to fractional (26.6) pixel coordinates. */
/* */
/* y_scale :: A simple 16.16 fixed point format coefficient used */
/* to scale vertical distances expressed in font */
/* units to fractional (26.6) pixel coordinates. */
/* */
/* ascender :: The ascender, expressed in 26.6 fixed point */
/* pixels. Positive for ascenders above the */
/* baseline. */
/* */
/* descender :: The descender, expressed in 26.6 fixed point */
/* pixels. Negative for descenders below the */
/* baseline. */
/* */
/* height :: The text height, expressed in 26.6 fixed point */
/* pixels. Always positive. */
/* */
/* max_advance :: Maximum horizontal advance, expressed in 26.6 */
/* fixed point pixels. Always positive. */
/* */
/* <Note> */
/* For scalable fonts, the values of `ascender', `descender', and */
/* `height' are scaled versions of `face->ascender', */
/* `face->descender', and `face->height', respectively. */
/* */
/* Unfortunately, due to glyph hinting, these values might not be */
/* exact for certain fonts. They thus must be treated as unreliable */
/* with an error margin of at least one pixel! */
/* */
/* Indeed, the only way to get the exact pixel ascender and descender */
/* is to render _all_ glyphs. As this would be a definite */
/* performance hit, it is up to client applications to perform such */
/* computations. */
/* */
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; /* two scales used to convert font units */
FT_Fixed y_scale; /* to 26.6 frac. pixel coordinates */
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 the */
/* resolution and pointsize dependent data of a given face. */
/* */
/* <Fields> */
/* face :: Handle to the parent face object. */
/* */
/* generic :: A typeless pointer, which is 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. */
/* */
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 */
/* vectorial or bitmap/graymaps. */
/* */
/* <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 which is 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 :: For scalable formats only, this field holds */
/* the linearly scaled horizontal advance width */
/* for the glyph (i.e. the scaled and unhinted */
/* value of the hori advance). This can be */
/* important to perform correct WYSIWYG layout. */
/* */
/* Note that this value is expressed by default */
/* in 16.16 pixels. However, when the glyph is */
/* loaded with the FT_LOAD_LINEAR_DESIGN flag, */
/* this field contains simply the value of the */
/* advance in original font units. */
/* */
/* linearVertAdvance :: For scalable formats only, this field holds */
/* the linearly scaled vertical advance height */
/* for the glyph. See linearHoriAdvance for */
/* comments. */
/* */
/* advance :: This is the transformed advance width for the */
/* glyph. */
/* */
/* format :: This field indicates the format of the image */
/* contained in the glyph slot. Typically */
/* FT_GLYPH_FORMAT_BITMAP, */
/* FT_GLYPH_FORMAT_OUTLINE, and */
/* FT_GLYPH_FORMAT_COMPOSITE, but others 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 :: This is the bitmap's left bearing expressed */
/* in integer pixels. Of course, this is only */
/* valid if the format is */
/* FT_GLYPH_FORMAT_BITMAP. */
/* */
/* bitmap_top :: This is the bitmap's top bearing expressed in */
/* integer pixels. Remember that 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. */
/* */
/* 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. */
/* For now this is internal to FreeType. */
/* */
/* 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. */
/* */
/* control_len :: This is the length in bytes of the control */
/* data. */
/* */
/* other :: Really wicked formats can use this pointer to */
/* present their own glyph image to client */
/* applications. Note that the application */
/* needs to know about the image format. */
/* */
/* lsb_delta :: The difference between hinted and unhinted */
/* left side bearing while autohinting is */
/* active. Zero otherwise. */
/* */
/* rsb_delta :: The difference between hinted and unhinted */
/* right side bearing while autohinting 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. a vectorial outline for TrueType and */
/* Type 1 formats). */
/* */
/* This image can later be converted into a bitmap by calling */
/* @FT_Render_Glyph. This function finds 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 convert 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' . */
/* */
/* <Note> */
/* Here a small pseudo code fragment which shows how to use */
/* `lsb_delta' and `rsb_delta': */
/* */
/* { */
/* 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 - face->glyph->lsb_delta >= 32 ) */
/* origin_x -= 64; */
/* else if ( prev_rsb_delta - face->glyph->lsb_delta < -32 ) */
/* origin_x += 64; */
/* */
/* prev_rsb_delta = face->glyph->rsb_delta; */
/* */
/* <save glyph image, or render glyph, or ...> */
/* */
/* origin_x += face->glyph->advance.x; */
/* endfor */
/* } */
/* */
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> */
/* Initializes 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. */
/* */
FT_EXPORT( FT_Error )
FT_Init_FreeType( FT_Library *alibrary );
/*************************************************************************/
/* */
/* <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 FT_FREETYPE_MAJOR, FT_FREETYPE_MINOR, and */
/* FT_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_Done_FreeType */
/* */
/* <Description> */
/* Destroys a given FreeType library object and all of its childs, */
/* 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' & `params' field. */
/* */
/* ft_open_memory :: Deprecated; use @FT_OPEN_MEMORY instead. */
/* */
/* ft_open_stream :: Deprecated; use @FT_OPEN_STREAM instead. */
/* */
/* ft_open_pathname :: Deprecated; use @FT_OPEN_PATHNAME instead. */
/* */
/* ft_open_driver :: Deprecated; use @FT_OPEN_DRIVER instead. */
/* */
/* ft_open_params :: Deprecated; use @FT_OPEN_PARAMS instead. */
/* */
/* <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
#define ft_open_memory FT_OPEN_MEMORY /* deprecated */
#define ft_open_stream FT_OPEN_STREAM /* deprecated */
#define ft_open_pathname FT_OPEN_PATHNAME /* deprecated */
#define ft_open_driver FT_OPEN_DRIVER /* deprecated */
#define ft_open_params FT_OPEN_PARAMS /* deprecated */
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Parameter */
/* */
/* <Description> */
/* A simple structure used to pass more or less generic parameters */
/* to @FT_Open_Face. */
/* */
/* <Fields> */
/* tag :: A 4-byte identification tag. */
/* */
/* data :: A pointer to the parameter data. */
/* */
/* <Note> */
/* The id and function of parameters are driver-specific. */
/* */
typedef struct FT_Parameter_
{
FT_ULong tag;
FT_Pointer data;
} FT_Parameter;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Open_Args */
/* */
/* <Description> */
/* A structure used to indicate how to open a new font file/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 to open */
/* the face. If set to 0, 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' which */
/* 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'. */
/* */
/* 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. */
/* */
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> */
/* Creates a new face object from a given resource and typeface index */
/* using a pathname to the font file. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* pathname :: A path to the font file. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* @FT_New_Face can be used to determine and/or check the font format */
/* of a given font resource. If the `face_index' field is negative, */
/* the function does _not_ return any face handle in `aface'; the */
/* return value is 0 if the font format is recognized, or non-zero */
/* otherwise. */
/* */
/* Each new face object created with this function also owns a */
/* default @FT_Size object, accessible as `face->size'. */
/* */
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> */
/* Creates a new face object from a given resource and typeface index */
/* using a font file already 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 :: The index of the face within the resource. The */
/* first face has index 0. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The font data bytes are used _directly_ by the @FT_Face object. */
/* This means that they are not copied, and that the client is */
/* responsible for releasing/destroying them _after_ the */
/* corresponding call to @FT_Done_Face . */
/* */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* @FT_New_Memory_Face can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function does _not_ return any face handle in */
/* `aface'; the return value is 0 if the font format is recognized, */
/* or non-zero otherwise. */
/* */
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> */
/* Opens a face object from a given resource and typeface index using */
/* an `FT_Open_Args' structure. If the face object doesn't exist, it */
/* is created. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* args :: A pointer to an `FT_Open_Args' structure which must */
/* be filled by the caller. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* @FT_Open_Face can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function does _not_ return any face handle in */
/* `*aface'; the function's return value is 0 if the font format is */
/* recognized, or non-zero otherwise. */
/* */
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> */
/* `Attaches' a given font file to an existing face. This is usually */
/* to read additional information for a single face object. For */
/* example, it is used to read the AFM files that come with Type 1 */
/* fonts in order to add kerning data and other metrics. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* filepathname :: An 8-bit pathname naming the `metrics' file. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, use @FT_Attach_Stream. */
/* */
/* The meaning of the `attach' action (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 attachments. */
/* */
FT_EXPORT( FT_Error )
FT_Attach_File( FT_Face face,
const char* filepathname );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* This function is similar to @FT_Attach_File with the exception */
/* that it reads the attachment from an arbitrary stream. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* parameters :: A pointer to an FT_Open_Args structure used to */
/* describe the input stream to FreeType. */
/* <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 attachments. */
/* */
FT_EXPORT( FT_Error )
FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Face */
/* */
/* <Description> */
/* Discards 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. */
/* */
FT_EXPORT( FT_Error )
FT_Done_Face( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The */
/* `char_width' and `char_height' values are used for the width and */
/* height, respectively, expressed in 26.6 fractional points. */
/* */
/* If the horizontal or vertical resolution values are zero, a */
/* default value of 72dpi is used. Similarly, if one of the */
/* character dimensions is zero, its value is set equal to the other. */
/* */
/* <InOut> */
/* face :: A handle to a target face object. */
/* */
/* <Input> */
/* char_width :: The character width, in 26.6 fractional points. */
/* */
/* char_height :: The character height, in 26.6 fractional */
/* points. */
/* */
/* horz_resolution :: The horizontal resolution. */
/* */
/* vert_resolution :: The vertical resolution. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* For BDF and PCF formats, this function uses the `PIXEL_SIZE' */
/* property of the bitmap font; the `char_width' parameter is */
/* ignored. */
/* */
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> */
/* Sets the character dimensions of a given face object. The width */
/* and height are expressed in integer pixels. */
/* */
/* If one of the character dimensions is zero, its value is set equal */
/* to the other. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* pixel_width :: The character width, in integer pixels. */
/* */
/* pixel_height :: The character height, in integer pixels. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The values of `pixel_width' and `pixel_height' correspond to the */
/* pixel values of the _typographic_ character size, which are NOT */
/* necessarily the same as the dimensions of the glyph `bitmap */
/* cells'. */
/* */
/* The `character size' is really the size of an abstract square */
/* called the `EM', used to design the font. However, depending */
/* on the font design, glyphs is smaller or greater than the EM. */
/* */
/* This means that setting the pixel size to, say, 8x8 doesn't */
/* guarantee in any way that you get glyph bitmaps that all fit */
/* within an 8x8 cell (sometimes even far from it). */
/* */
/* For bitmap fonts, `pixel_height' usually is a reliable value for */
/* the height of the bitmap cell. Drivers for bitmap font formats */
/* which contain a single bitmap strike only (BDF, PCF, FNT) ignore */
/* `pixel_width'. */
/* */
/* For BDF and PCF formats, this function uses the sum of the */
/* `FONT_ASCENT' and `FONT_DESCENT' properties of the bitmap font. */
/* */
FT_EXPORT( FT_Error )
FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Glyph */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size. */
/* */
/* <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> */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image is transformed */
/* with the information passed to a previous call to */
/* @FT_Set_Transform. */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT( FT_Error )
FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int32 load_flags );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Char */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size, according to 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> */
/* If the face has no current charmap, or if the character code */
/* is not defined in the charmap, this function returns an error. */
/* */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image is */
/* transformed with the information passed to a previous call to */
/* @FT_Set_Transform. */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
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, used with @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 a default glyph load. 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 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 vector outline being loaded to 26.6 fractional
* pixels, but kept in font units. Note that this also disables
* hinting and the loading of embedded bitmaps. You should only use it
* when you want to retrieve the original glyph outlines in font units.
*
* FT_LOAD_NO_HINTING ::
* Don't hint glyph outlines after their scaling to device pixels.
* This generally generates "blurrier" glyphs in anti-aliased modes.
*
* This flag is ignored if @FT_LOAD_NO_SCALE is set.
*
* FT_LOAD_RENDER ::
* Render the glyph outline immediately into a bitmap before the glyph
* loader returns. By default, the glyph is rendered for the
* @FT_RENDER_MODE_NORMAL mode, which corresponds to 8-bit anti-aliased
* bitmaps using 256 opacity levels. You can use either
* @FT_LOAD_TARGET_MONO or @FT_LOAD_MONOCHROME to render 1-bit
* monochrome bitmaps.
*
* This flag is ignored if @FT_LOAD_NO_SCALE is set.
*
* FT_LOAD_NO_BITMAP ::
* Don't look for bitmaps when loading the glyph. Only scalable
* outlines are loaded when available, and scaled, hinted, or
* rendered depending on other bit flags.
*
* This does not prevent you from rendering outlines to bitmaps
* with @FT_LOAD_RENDER, however.
*
* FT_LOAD_VERTICAL_LAYOUT ::
* Prepare the glyph image for vertical text layout. This basically
* means that `face.glyph.advance' corresponds to the vertical
* advance height (instead of the default horizontal advance width),
* and that the glyph image is translated to match the vertical
* bearings positions.
*
* FT_LOAD_FORCE_AUTOHINT ::
* Force the use of the FreeType auto-hinter when a glyph outline is
* loaded. You shouldn't need this in a typical application, since it
* is mostly used to experiment with its algorithm.
*
* FT_LOAD_CROP_BITMAP ::
* Indicates that the glyph loader should try to crop the bitmap (i.e.,
* remove all space around its black bits) when loading it. This is
* only useful when loading embedded bitmaps in certain fonts, since
* bitmaps rendered with @FT_LOAD_RENDER are always cropped by default.
*
* FT_LOAD_PEDANTIC ::
* Indicates that the glyph loader should perform pedantic
* verifications during glyph loading, rejecting invalid fonts. This
* is mostly used to detect broken glyphs in fonts. By default,
* FreeType tries to handle broken fonts also.
*
* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ::
* Indicates that the glyph loader should ignore the global advance
* width defined in the font. For historical reasons (to support
* buggy CJK fonts), FreeType uses the value of the `advanceWidthMax'
* field in the `htmx' table for all glyphs if the font is monospaced.
* Activating this flags makes FreeType use the metric values given in
* the `htmx' table.
*
* FT_LOAD_NO_RECURSE ::
* This flag is only used internally. It merely indicates that the
* glyph loader should not load composite glyphs recursively. Instead,
* it 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 sub-glyphs is not available to client
* applications for now.
*
* FT_LOAD_IGNORE_TRANSFORM ::
* Indicates that the glyph loader should not try to transform the
* loaded glyph image. This doesn't prevent scaling, hinting, or
* rendering.
*
* FT_LOAD_MONOCHROME ::
* This flag is used with @FT_LOAD_RENDER to indicate that you want
* to render a 1-bit monochrome glyph bitmap from a vectorial outline.
*
* Note that this has no effect on the hinting algorithm used by the
* glyph loader. You should better use @FT_LOAD_TARGET_MONO if you
* want to render monochrome-optimized glyph images instead.
*
* FT_LOAD_LINEAR_DESIGN ::
* Return the linearly scaled metrics expressed in original font units
* instead of the default 16.16 pixel values.
*
* FT_LOAD_NO_AUTOHINT ::
* Indicates that the auto-hinter should never be used to hint glyph
* outlines. This doesn't prevent native format-specific hinters from
* being used. This can be important for certain fonts where unhinted
* output is better than auto-hinted one.
*
* FT_LOAD_TARGET_NORMAL ::
* Use hinting for @FT_RENDER_MODE_NORMAL.
*
* FT_LOAD_TARGET_LIGHT ::
* Use hinting for @FT_RENDER_MODE_LIGHT.
*
* FT_LOAD_TARGET_MONO ::
* Use hinting for @FT_RENDER_MODE_MONO.
*
* FT_LOAD_TARGET_LCD ::
* Use hinting for @FT_RENDER_MODE_LCD.
*
* FT_LOAD_TARGET_LCD_V ::
* Use hinting for @FT_RENDER_MODE_LCD_V.
*
* @note:
* You should use only _one_ of the FT_LOAD_TARGET_XXX values; they
* can't be ORed.
*
* However, FreeType makes a distinction between the hinting algorithm
* being used, and the pixel mode of the target bitmaps. For example,
* it is possible to use the `light' hinting algorithm and have the
* results rendered in horizontal LCD pixel mode, with code like this:
*
* FT_Load_Glyph( face, glyph_index,
* load_flags | FT_LOAD_TARGET_LIGHT );
* FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD );
*
*/
#define FT_LOAD_DEFAULT 0x0
#define FT_LOAD_NO_SCALE 0x1
#define FT_LOAD_NO_HINTING 0x2
#define FT_LOAD_RENDER 0x4
#define FT_LOAD_NO_BITMAP 0x8
#define FT_LOAD_VERTICAL_LAYOUT 0x10
#define FT_LOAD_FORCE_AUTOHINT 0x20
#define FT_LOAD_CROP_BITMAP 0x40
#define FT_LOAD_PEDANTIC 0x80
#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH 0x200
#define FT_LOAD_NO_RECURSE 0x400
#define FT_LOAD_IGNORE_TRANSFORM 0x800
#define FT_LOAD_MONOCHROME 0x1000
#define FT_LOAD_LINEAR_DESIGN 0x2000
/* temporary hack! */
#define FT_LOAD_SBITS_ONLY 0x4000
#define FT_LOAD_NO_AUTOHINT 0x8000U
/* */
#define FT_LOAD_TARGET_( x ) ( (FT_Int32)( (x) & 15 ) << 16 )
#define FT_LOAD_TARGET_MODE( x ) ( (FT_Render_Mode)( ( (x) >> 16 ) & 15 ) )
#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 )
/* */
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Transform */
/* */
/* <Description> */
/* A function used to 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 0 for */
/* the identity matrix. */
/* delta :: A pointer to the translation vector. Use 0 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. */
/* */
FT_EXPORT( void )
FT_Set_Transform( FT_Face face,
FT_Matrix* matrix,
FT_Vector* delta );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Render_Mode */
/* */
/* <Description> */
/* An enumeration type that lists the render modes supported by */
/* FreeType 2. Each mode corresponds to a specific type of scanline */
/* conversion performed on the outline, as well as specific */
/* hinting optimizations. */
/* */
/* For bitmap fonts the `bitmap->pixel_mode' field in the */
/* @FT_GlyphSlotRec structure gives the format of the returned */
/* bitmap. */
/* */
/* <Values> */
/* FT_RENDER_MODE_NORMAL :: */
/* This is the default render mode; it corresponds to 8-bit */
/* anti-aliased bitmaps, using 256 levels of opacity. */
/* */
/* FT_RENDER_MODE_LIGHT :: */
/* This is similar to @FT_RENDER_MODE_NORMAL -- you have to use */
/* @FT_LOAD_TARGET_LIGHT in calls to @FT_Load_Glyph to get any */
/* effect since the rendering process no longer influences the */
/* positioning of glyph outlines. */
/* */
/* The resulting glyph shapes are more similar to the original, */
/* while being a bit more fuzzy (`better shapes' instead of `better */
/* contrast', so to say. */
/* */
/* FT_RENDER_MODE_MONO :: */
/* This mode corresponds to 1-bit bitmaps. */
/* */
/* FT_RENDER_MODE_LCD :: */
/* This mode corresponds to horizontal RGB/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/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 are */
/* _not filtered_ to reduce color-fringes. It is up to the caller to */
/* perform this pass. */
/* */
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;
/*************************************************************************/
/* */
/* <Enum> */
/* ft_render_mode_xxx */
/* */
/* <Description> */
/* These constats are deprecated. Use the corresponding */
/* @FT_Render_Mode values instead. */
/* */
/* <Values> */
/* ft_render_mode_normal :: see @FT_RENDER_MODE_NORMAL */
/* ft_render_mode_mono :: see @FT_RENDER_MODE_MONO */
/* */
#define ft_render_mode_normal FT_RENDER_MODE_NORMAL
#define ft_render_mode_mono FT_RENDER_MODE_MONO
/*************************************************************************/
/* */
/* <Function> */
/* FT_Render_Glyph */
/* */
/* <Description> */
/* Converts a given glyph image to a bitmap. It does so by */
/* inspecting the glyph image format, find the relevant renderer, and */
/* invoke it. */
/* */
/* <InOut> */
/* slot :: A handle to the glyph slot containing the image to */
/* convert. */
/* */
/* <Input> */
/* render_mode :: This is 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. */
/* */
FT_EXPORT( FT_Error )
FT_Render_Glyph( FT_GlyphSlot slot,
FT_Render_Mode render_mode );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Kerning_Mode */
/* */
/* <Description> */
/* An enumeration used to specify which kerning values to return in */
/* @FT_Get_Kerning. */
/* */
/* <Values> */
/* FT_KERNING_DEFAULT :: Return scaled and grid-fitted kerning */
/* distances (value is 0). */
/* */
/* FT_KERNING_UNFITTED :: Return scaled but un-grid-fitted kerning */
/* distances. */
/* */
/* FT_KERNING_UNSCALED :: Return the kerning vector in original font */
/* units. */
/* */
typedef enum FT_Kerning_Mode_
{
FT_KERNING_DEFAULT = 0,
FT_KERNING_UNFITTED,
FT_KERNING_UNSCALED
} FT_Kerning_Mode;
/*************************************************************************/
/* */
/* <Const> */
/* ft_kerning_default */
/* */
/* <Description> */
/* This constant is deprecated. Please use @FT_KERNING_DEFAULT */
/* instead. */
/* */
#define ft_kerning_default FT_KERNING_DEFAULT
/*************************************************************************/
/* */
/* <Const> */
/* ft_kerning_unfitted */
/* */
/* <Description> */
/* This constant is deprecated. Please use @FT_KERNING_UNFITTED */
/* instead. */
/* */
#define ft_kerning_unfitted FT_KERNING_UNFITTED
/*************************************************************************/
/* */
/* <Const> */
/* ft_kerning_unscaled */
/* */
/* <Description> */
/* This constant is deprecated. Please use @FT_KERNING_UNSCALED */
/* instead. */
/* */
#define ft_kerning_unscaled FT_KERNING_UNSCALED
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Kerning */
/* */
/* <Description> */
/* Returns the kerning vector between two glyphs of a 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/dimension of the returned */
/* kerning vector. */
/* */
/* <Output> */
/* akerning :: The kerning vector. This is either in font units */
/* or in pixels (26.6 format) 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. */
/* */
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_Glyph_Name */
/* */
/* <Description> */
/* Retrieves the ASCII name of a given glyph in a face. This only */
/* works for those faces where FT_HAS_GLYPH_NAME(face) returns true. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* glyph_index :: The glyph index. */
/* */
/* buffer_max :: The maximal 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. */
/* */
/* This function is not compiled within the library if the config */
/* macro FT_CONFIG_OPTION_NO_GLYPH_NAMES is defined in */
/* `include/freetype/config/ftoptions.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> */
/* Retrieves the ASCII Postscript name of a given face, if available. */
/* This only works with Postscript and TrueType 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 will be destroyed */
/* with it. */
/* */
FT_EXPORT( const char* )
FT_Get_Postscript_Name( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Charmap */
/* */
/* <Description> */
/* Selects 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. */
/* */
FT_EXPORT( FT_Error )
FT_Select_Charmap( FT_Face face,
FT_Encoding encoding );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Charmap */
/* */
/* <Description> */
/* Selects a given charmap for character code to glyph index */
/* decoding. */
/* */
/* <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). */
/* */
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. */
/* */
FT_EXPORT( FT_Int )
FT_Get_Charmap_Index( FT_CharMap charmap );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Char_Index */
/* */
/* <Description> */
/* Returns the glyph index of a given character code. This function */
/* uses a charmap object to do the translation. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* charcode :: The character code. */
/* */
/* <Return> */
/* The glyph index. 0 means `undefined character code'. */
/* */
/* <Note> */
/* FreeType computes its own glyph indices which are not necessarily */
/* the same as used in the font in case the font is based on glyph */
/* indices. Reason for this behaviour is to assure that index 0 is */
/* never used, representing the missing glyph. */
/* */
FT_EXPORT( FT_UInt )
FT_Get_Char_Index( FT_Face face,
FT_ULong charcode );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_First_Char */
/* */
/* <Description> */
/* This function is used to return the first character code in the */
/* current charmap of a given face. It also returns the */
/* 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 with @FT_Get_Next_Char to be able 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 ); */
/* } */
/* } */
/* */
/* 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 */
/* when 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> */
/* This function is used to 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 first 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 */
/* through all character codes available in a given charmap. See */
/* the note for this 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_Get_Name_Index */
/* */
/* <Description> */
/* Returns the glyph index of a given glyph name. This function uses */
/* driver specific objects to do the translation. */
/* */
/* <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 );
/*************************************************************************/
/* */
/* <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> */
/* A very simple function used to perform the computation `(a*b)/c' */
/* with maximal accuracy (it uses 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> */
/* A very simple function used to perform the computation */
/* `(a*b)/0x10000' with maximal accuracy. Most of the time this is */
/* used to multiply a given value by a 16.16 fixed float 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> */
/* A very simple function used to perform the computation */
/* `(a*0x10000)/b' with maximal accuracy. Most of the time, this is */
/* used to divide a given value by a 16.16 fixed float 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*0x10000)/b'. */
/* */
/* <Note> */
/* The optimization for FT_DivFix() is simple: If (a << 16) fits in */
/* 32 bits, then the division is computed directly. Otherwise, we */
/* use a specialized version of @FT_MulDiv. */
/* */
FT_EXPORT( FT_Long )
FT_DivFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/* */
/* <Function> */
/* FT_RoundFix */
/* */
/* <Description> */
/* A very simple function used to round a 16.16 fixed number. */
/* */
/* <Input> */
/* a :: The number to be rounded. */
/* */
/* <Return> */
/* The result of `(a + 0x8000) & -0x10000'. */
/* */
FT_EXPORT( FT_Fixed )
FT_RoundFix( FT_Fixed a );
/*************************************************************************/
/* */
/* <Function> */
/* FT_CeilFix */
/* */
/* <Description> */
/* A very simple function used to compute the ceiling function of a */
/* 16.16 fixed number. */
/* */
/* <Input> */
/* a :: The number for which the ceiling function is to be computed. */
/* */
/* <Return> */
/* The result of `(a + 0x10000 - 1) & -0x10000'. */
/* */
FT_EXPORT( FT_Fixed )
FT_CeilFix( FT_Fixed a );
/*************************************************************************/
/* */
/* <Function> */
/* FT_FloorFix */
/* */
/* <Description> */
/* A very simple function used to compute the floor function of a */
/* 16.16 fixed number. */
/* */
/* <Input> */
/* a :: The number for which the floor function is to be computed. */
/* */
/* <Return> */
/* The result of `a & -0x10000'. */
/* */
FT_EXPORT( FT_Fixed )
FT_FloorFix( FT_Fixed a );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Vector_Transform */
/* */
/* <Description> */
/* Transforms 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 );
/* */
FT_END_HEADER
#endif /* __FREETYPE_H__ */
/* END */
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