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skia / third_party / freetype2 / refs/tags/VER-2-9-1 / . / include / freetype / freetype.h
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/***************************************************************************/
/* */
/* freetype.h */
/* */
/* FreeType high-level API and common types (specification only). */
/* */
/* Copyright 1996-2018 by */
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
/* */
/* This file is part of the FreeType project, and may only be used, */
/* modified, and distributed under the terms of the FreeType project */
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
/* this file you indicate that you have read the license and */
/* understand and accept it fully. */
/* */
/***************************************************************************/
#ifndef FREETYPE_H_
#define FREETYPE_H_
#ifndef FT_FREETYPE_H
#error "`ft2build.h' hasn't been included yet!"
#error "Please always use macros to include FreeType header files."
#error "Example:"
#error " #include <ft2build.h>"
#error " #include FT_FREETYPE_H"
#endif
#include <ft2build.h>
#include FT_CONFIG_CONFIG_H
#include FT_TYPES_H
#include FT_ERRORS_H
FT_BEGIN_HEADER
/*************************************************************************/
/* */
/* <Section> */
/* header_inclusion */
/* */
/* <Title> */
/* FreeType's header inclusion scheme */
/* */
/* <Abstract> */
/* How client applications should include FreeType header files. */
/* */
/* <Description> */
/* To be as flexible as possible (and for historical reasons), */
/* FreeType uses a very special inclusion scheme to load header */
/* files, for example */
/* */
/* { */
/* #include <ft2build.h> */
/* */
/* #include FT_FREETYPE_H */
/* #include FT_OUTLINE_H */
/* } */
/* */
/* A compiler and its preprocessor only needs an include path to find */
/* the file `ft2build.h'; the exact locations and names of the other */
/* FreeType header files are hidden by preprocessor macro names, */
/* loaded by `ft2build.h'. The API documentation always gives the */
/* header macro name needed for a particular function. */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Section> */
/* user_allocation */
/* */
/* <Title> */
/* User allocation */
/* */
/* <Abstract> */
/* How client applications should allocate FreeType data structures. */
/* */
/* <Description> */
/* FreeType assumes that structures allocated by the user and passed */
/* as arguments are zeroed out except for the actual data. In other */
/* words, it is recommended to use `calloc' (or variants of it) */
/* instead of `malloc' for allocation. */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* B A S I C T Y P E S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Section> */
/* base_interface */
/* */
/* <Title> */
/* Base Interface */
/* */
/* <Abstract> */
/* The FreeType~2 base font interface. */
/* */
/* <Description> */
/* This section describes the most important public high-level API */
/* functions of FreeType~2. */
/* */
/* <Order> */
/* FT_Library */
/* FT_Face */
/* FT_Size */
/* FT_GlyphSlot */
/* FT_CharMap */
/* FT_Encoding */
/* FT_ENC_TAG */
/* */
/* FT_FaceRec */
/* */
/* FT_FACE_FLAG_SCALABLE */
/* FT_FACE_FLAG_FIXED_SIZES */
/* FT_FACE_FLAG_FIXED_WIDTH */
/* FT_FACE_FLAG_HORIZONTAL */
/* FT_FACE_FLAG_VERTICAL */
/* FT_FACE_FLAG_COLOR */
/* FT_FACE_FLAG_SFNT */
/* FT_FACE_FLAG_CID_KEYED */
/* FT_FACE_FLAG_TRICKY */
/* FT_FACE_FLAG_KERNING */
/* FT_FACE_FLAG_MULTIPLE_MASTERS */
/* FT_FACE_FLAG_VARIATION */
/* FT_FACE_FLAG_GLYPH_NAMES */
/* FT_FACE_FLAG_EXTERNAL_STREAM */
/* FT_FACE_FLAG_HINTER */
/* */
/* FT_HAS_HORIZONTAL */
/* FT_HAS_VERTICAL */
/* FT_HAS_KERNING */
/* FT_HAS_FIXED_SIZES */
/* FT_HAS_GLYPH_NAMES */
/* FT_HAS_COLOR */
/* FT_HAS_MULTIPLE_MASTERS */
/* */
/* FT_IS_SFNT */
/* FT_IS_SCALABLE */
/* FT_IS_FIXED_WIDTH */
/* FT_IS_CID_KEYED */
/* FT_IS_TRICKY */
/* FT_IS_NAMED_INSTANCE */
/* FT_IS_VARIATION */
/* */
/* FT_STYLE_FLAG_BOLD */
/* FT_STYLE_FLAG_ITALIC */
/* */
/* FT_SizeRec */
/* FT_Size_Metrics */
/* */
/* FT_GlyphSlotRec */
/* FT_Glyph_Metrics */
/* FT_SubGlyph */
/* */
/* FT_Bitmap_Size */
/* */
/* FT_Init_FreeType */
/* FT_Done_FreeType */
/* */
/* FT_New_Face */
/* FT_Done_Face */
/* FT_Reference_Face */
/* FT_New_Memory_Face */
/* FT_Face_Properties */
/* FT_Open_Face */
/* FT_Open_Args */
/* FT_Parameter */
/* FT_Attach_File */
/* FT_Attach_Stream */
/* */
/* FT_Set_Char_Size */
/* FT_Set_Pixel_Sizes */
/* FT_Request_Size */
/* FT_Select_Size */
/* FT_Size_Request_Type */
/* FT_Size_RequestRec */
/* FT_Size_Request */
/* FT_Set_Transform */
/* FT_Load_Glyph */
/* FT_Get_Char_Index */
/* FT_Get_First_Char */
/* FT_Get_Next_Char */
/* FT_Get_Name_Index */
/* FT_Load_Char */
/* */
/* FT_OPEN_MEMORY */
/* FT_OPEN_STREAM */
/* FT_OPEN_PATHNAME */
/* FT_OPEN_DRIVER */
/* FT_OPEN_PARAMS */
/* */
/* FT_LOAD_DEFAULT */
/* FT_LOAD_RENDER */
/* FT_LOAD_MONOCHROME */
/* FT_LOAD_LINEAR_DESIGN */
/* FT_LOAD_NO_SCALE */
/* FT_LOAD_NO_HINTING */
/* FT_LOAD_NO_BITMAP */
/* FT_LOAD_NO_AUTOHINT */
/* FT_LOAD_COLOR */
/* */
/* FT_LOAD_VERTICAL_LAYOUT */
/* FT_LOAD_IGNORE_TRANSFORM */
/* FT_LOAD_FORCE_AUTOHINT */
/* FT_LOAD_NO_RECURSE */
/* FT_LOAD_PEDANTIC */
/* */
/* FT_LOAD_TARGET_NORMAL */
/* FT_LOAD_TARGET_LIGHT */
/* FT_LOAD_TARGET_MONO */
/* FT_LOAD_TARGET_LCD */
/* FT_LOAD_TARGET_LCD_V */
/* */
/* FT_LOAD_TARGET_MODE */
/* */
/* FT_Render_Glyph */
/* FT_Render_Mode */
/* FT_Get_Kerning */
/* FT_Kerning_Mode */
/* FT_Get_Track_Kerning */
/* FT_Get_Glyph_Name */
/* FT_Get_Postscript_Name */
/* */
/* FT_CharMapRec */
/* FT_Select_Charmap */
/* FT_Set_Charmap */
/* FT_Get_Charmap_Index */
/* */
/* FT_Get_FSType_Flags */
/* FT_Get_SubGlyph_Info */
/* */
/* FT_Face_Internal */
/* FT_Size_Internal */
/* FT_Slot_Internal */
/* */
/* FT_FACE_FLAG_XXX */
/* FT_STYLE_FLAG_XXX */
/* FT_OPEN_XXX */
/* FT_LOAD_XXX */
/* FT_LOAD_TARGET_XXX */
/* FT_SUBGLYPH_FLAG_XXX */
/* FT_FSTYPE_XXX */
/* */
/* FT_HAS_FAST_GLYPHS */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Glyph_Metrics */
/* */
/* <Description> */
/* A structure to model the metrics of a single glyph. The values */
/* are expressed in 26.6 fractional pixel format; if the flag */
/* @FT_LOAD_NO_SCALE has been used while loading the glyph, values */
/* are expressed in font units instead. */
/* */
/* <Fields> */
/* width :: */
/* The glyph's width. */
/* */
/* height :: */
/* The glyph's height. */
/* */
/* horiBearingX :: */
/* Left side bearing for horizontal layout. */
/* */
/* horiBearingY :: */
/* Top side bearing for horizontal layout. */
/* */
/* horiAdvance :: */
/* Advance width for horizontal layout. */
/* */
/* vertBearingX :: */
/* Left side bearing for vertical layout. */
/* */
/* vertBearingY :: */
/* Top side bearing for vertical layout. Larger positive values */
/* mean further below the vertical glyph origin. */
/* */
/* vertAdvance :: */
/* Advance height for vertical layout. Positive values mean the */
/* glyph has a positive advance downward. */
/* */
/* <Note> */
/* If not disabled with @FT_LOAD_NO_HINTING, the values represent */
/* dimensions of the hinted glyph (in case hinting is applicable). */
/* */
/* Stroking a glyph with an outside border does not increase */
/* `horiAdvance' or `vertAdvance'; you have to manually adjust these */
/* values to account for the added width and height. */
/* */
/* FreeType doesn't use the `VORG' table data for CFF fonts because */
/* it doesn't have an interface to quickly retrieve the glyph height. */
/* The y~coordinate of the vertical origin can be simply computed as */
/* `vertBearingY + height' after loading a glyph. */
/* */
typedef struct FT_Glyph_Metrics_
{
FT_Pos width;
FT_Pos height;
FT_Pos horiBearingX;
FT_Pos horiBearingY;
FT_Pos horiAdvance;
FT_Pos vertBearingX;
FT_Pos vertBearingY;
FT_Pos vertAdvance;
} FT_Glyph_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Bitmap_Size */
/* */
/* <Description> */
/* This structure models the metrics of a bitmap strike (i.e., a set */
/* of glyphs for a given point size and resolution) in a bitmap font. */
/* It is used for the `available_sizes' field of @FT_Face. */
/* */
/* <Fields> */
/* height :: The vertical distance, in pixels, between two */
/* consecutive baselines. It is always positive. */
/* */
/* width :: The average width, in pixels, of all glyphs in the */
/* strike. */
/* */
/* size :: The nominal size of the strike in 26.6 fractional */
/* points. This field is not very useful. */
/* */
/* x_ppem :: The horizontal ppem (nominal width) in 26.6 fractional */
/* pixels. */
/* */
/* y_ppem :: The vertical ppem (nominal height) in 26.6 fractional */
/* pixels. */
/* */
/* <Note> */
/* Windows FNT: */
/* The nominal size given in a FNT font is not reliable. If the */
/* driver finds it incorrect, it sets `size' to some calculated */
/* values, and `x_ppem' and `y_ppem' to the pixel width and height */
/* given in the font, respectively. */
/* */
/* TrueType embedded bitmaps: */
/* `size', `width', and `height' values are not contained in the */
/* bitmap strike itself. They are computed from the global font */
/* parameters. */
/* */
typedef struct FT_Bitmap_Size_
{
FT_Short height;
FT_Short width;
FT_Pos size;
FT_Pos x_ppem;
FT_Pos y_ppem;
} FT_Bitmap_Size;
/*************************************************************************/
/*************************************************************************/
/* */
/* O B J E C T C L A S S E S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FT_Library */
/* */
/* <Description> */
/* A handle to a FreeType library instance. Each `library' is */
/* completely independent from the others; it is the `root' of a set */
/* of objects like fonts, faces, sizes, etc. */
/* */
/* It also embeds a memory manager (see @FT_Memory), as well as a */
/* scan-line converter object (see @FT_Raster). */
/* */
/* In multi-threaded applications it is easiest to use one */
/* `FT_Library' object per thread. In case this is too cumbersome, */
/* a single `FT_Library' object across threads is possible also */
/* (since FreeType version 2.5.6), as long as a mutex lock is used */
/* around @FT_New_Face and @FT_Done_Face. */
/* */
/* <Note> */
/* Library objects are normally created by @FT_Init_FreeType, and */
/* destroyed with @FT_Done_FreeType. If you need reference-counting */
/* (cf. @FT_Reference_Library), use @FT_New_Library and */
/* @FT_Done_Library. */
/* */
typedef struct FT_LibraryRec_ *FT_Library;
/*************************************************************************/
/* */
/* <Section> */
/* module_management */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FT_Module */
/* */
/* <Description> */
/* A handle to a given FreeType module object. A module can be a */
/* font driver, a renderer, or anything else that provides services */
/* to the former. */
/* */
typedef struct FT_ModuleRec_* FT_Module;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Driver */
/* */
/* <Description> */
/* A handle to a given FreeType font driver object. A font driver */
/* is a module capable of creating faces from font files. */
/* */
typedef struct FT_DriverRec_* FT_Driver;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Renderer */
/* */
/* <Description> */
/* A handle to a given FreeType renderer. A renderer is a module in */
/* charge of converting a glyph's outline image to a bitmap. It */
/* supports a single glyph image format, and one or more target */
/* surface depths. */
/* */
typedef struct FT_RendererRec_* FT_Renderer;
/*************************************************************************/
/* */
/* <Section> */
/* base_interface */
/* */
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FT_Face */
/* */
/* <Description> */
/* A handle to a typographic face object. A face object models a */
/* given typeface, in a given style. */
/* */
/* <Note> */
/* A face object also owns a single @FT_GlyphSlot object, as well */
/* as one or more @FT_Size objects. */
/* */
/* Use @FT_New_Face or @FT_Open_Face to create a new face object from */
/* a given filepath or a custom input stream. */
/* */
/* Use @FT_Done_Face to destroy it (along with its slot and sizes). */
/* */
/* An `FT_Face' object can only be safely used from one thread at a */
/* time. Similarly, creation and destruction of `FT_Face' with the */
/* same @FT_Library object can only be done from one thread at a */
/* time. On the other hand, functions like @FT_Load_Glyph and its */
/* siblings are thread-safe and do not need the lock to be held as */
/* long as the same `FT_Face' object is not used from multiple */
/* threads at the same time. */
/* */
/* <Also> */
/* See @FT_FaceRec for the publicly accessible fields of a given face */
/* object. */
/* */
typedef struct FT_FaceRec_* FT_Face;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Size */
/* */
/* <Description> */
/* A handle to an object that models a face scaled to a given */
/* character size. */
/* */
/* <Note> */
/* An @FT_Face has one _active_ @FT_Size object that is used by */
/* functions like @FT_Load_Glyph to determine the scaling */
/* transformation that in turn is used to load and hint glyphs and */
/* metrics. */
/* */
/* You can use @FT_Set_Char_Size, @FT_Set_Pixel_Sizes, */
/* @FT_Request_Size or even @FT_Select_Size to change the content */
/* (i.e., the scaling values) of the active @FT_Size. */
/* */
/* You can use @FT_New_Size to create additional size objects for a */
/* given @FT_Face, but they won't be used by other functions until */
/* you activate it through @FT_Activate_Size. Only one size can be */
/* activated at any given time per face. */
/* */
/* <Also> */
/* See @FT_SizeRec for the publicly accessible fields of a given size */
/* object. */
/* */
typedef struct FT_SizeRec_* FT_Size;
/*************************************************************************/
/* */
/* <Type> */
/* FT_GlyphSlot */
/* */
/* <Description> */
/* A handle to a given `glyph slot'. A slot is a container that can */
/* hold any of the glyphs contained in its parent face. */
/* */
/* In other words, each time you call @FT_Load_Glyph or */
/* @FT_Load_Char, the slot's content is erased by the new glyph data, */
/* i.e., the glyph's metrics, its image (bitmap or outline), and */
/* other control information. */
/* */
/* <Also> */
/* See @FT_GlyphSlotRec for the publicly accessible glyph fields. */
/* */
typedef struct FT_GlyphSlotRec_* FT_GlyphSlot;
/*************************************************************************/
/* */
/* <Type> */
/* FT_CharMap */
/* */
/* <Description> */
/* A handle to a character map (usually abbreviated to `charmap'). A */
/* charmap is used to translate character codes in a given encoding */
/* into glyph indexes for its parent's face. Some font formats may */
/* provide several charmaps per font. */
/* */
/* Each face object owns zero or more charmaps, but only one of them */
/* can be `active', providing the data used by @FT_Get_Char_Index or */
/* @FT_Load_Char. */
/* */
/* The list of available charmaps in a face is available through the */
/* `face->num_charmaps' and `face->charmaps' fields of @FT_FaceRec. */
/* */
/* The currently active charmap is available as `face->charmap'. */
/* You should call @FT_Set_Charmap to change it. */
/* */
/* <Note> */
/* When a new face is created (either through @FT_New_Face or */
/* @FT_Open_Face), the library looks for a Unicode charmap within */
/* the list and automatically activates it. If there is no Unicode */
/* charmap, FreeType doesn't set an `active' charmap. */
/* */
/* <Also> */
/* See @FT_CharMapRec for the publicly accessible fields of a given */
/* character map. */
/* */
typedef struct FT_CharMapRec_* FT_CharMap;
/*************************************************************************/
/* */
/* <Macro> */
/* FT_ENC_TAG */
/* */
/* <Description> */
/* This macro converts four-letter tags into an unsigned long. It is */
/* used to define `encoding' identifiers (see @FT_Encoding). */
/* */
/* <Note> */
/* Since many 16-bit compilers don't like 32-bit enumerations, you */
/* should redefine this macro in case of problems to something like */
/* this: */
/* */
/* { */
/* #define FT_ENC_TAG( value, a, b, c, d ) value */
/* } */
/* */
/* to get a simple enumeration without assigning special numbers. */
/* */
#ifndef FT_ENC_TAG
#define FT_ENC_TAG( value, a, b, c, d ) \
value = ( ( (FT_UInt32)(a) << 24 ) | \
( (FT_UInt32)(b) << 16 ) | \
( (FT_UInt32)(c) << 8 ) | \
(FT_UInt32)(d) )
#endif /* FT_ENC_TAG */
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Encoding */
/* */
/* <Description> */
/* An enumeration to specify character sets supported by charmaps. */
/* Used in the @FT_Select_Charmap API function. */
/* */
/* <Note> */
/* Despite the name, this enumeration lists specific character */
/* repertories (i.e., charsets), and not text encoding methods (e.g., */
/* UTF-8, UTF-16, etc.). */
/* */
/* Other encodings might be defined in the future. */
/* */
/* <Values> */
/* FT_ENCODING_NONE :: */
/* The encoding value~0 is reserved. */
/* */
/* FT_ENCODING_UNICODE :: */
/* The Unicode character set. This value covers all versions of */
/* the Unicode repertoire, including ASCII and Latin-1. Most fonts */
/* include a Unicode charmap, but not all of them. */
/* */
/* For example, if you want to access Unicode value U+1F028 (and */
/* the font contains it), use value 0x1F028 as the input value for */
/* @FT_Get_Char_Index. */
/* */
/* FT_ENCODING_MS_SYMBOL :: */
/* Microsoft Symbol encoding, used to encode mathematical symbols */
/* and wingdings. For more information, see */
/* `https://www.microsoft.com/typography/otspec/recom.htm', */
/* `http://www.kostis.net/charsets/symbol.htm', and */
/* `http://www.kostis.net/charsets/wingding.htm'. */
/* */
/* This encoding uses character codes from the PUA (Private Unicode */
/* Area) in the range U+F020-U+F0FF. */
/* */
/* FT_ENCODING_SJIS :: */
/* Shift JIS encoding for Japanese. More info at */
/* `https://en.wikipedia.org/wiki/Shift_JIS'. See note on */
/* multi-byte encodings below. */
/* */
/* FT_ENCODING_PRC :: */
/* Corresponds to encoding systems mainly for Simplified Chinese as */
/* used in People's Republic of China (PRC). The encoding layout */
/* is based on GB~2312 and its supersets GBK and GB~18030. */
/* */
/* FT_ENCODING_BIG5 :: */
/* Corresponds to an encoding system for Traditional Chinese as */
/* used in Taiwan and Hong Kong. */
/* */
/* FT_ENCODING_WANSUNG :: */
/* Corresponds to the Korean encoding system known as Extended */
/* Wansung (MS Windows code page 949). */
/* For more information see */
/* `https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit949.txt'. */
/* */
/* FT_ENCODING_JOHAB :: */
/* The Korean standard character set (KS~C 5601-1992), which */
/* corresponds to MS Windows code page 1361. This character set */
/* includes all possible Hangul character combinations. */
/* */
/* FT_ENCODING_ADOBE_LATIN_1 :: */
/* Corresponds to a Latin-1 encoding as defined in a Type~1 */
/* PostScript font. It is limited to 256 character codes. */
/* */
/* FT_ENCODING_ADOBE_STANDARD :: */
/* Adobe Standard encoding, as found in Type~1, CFF, and */
/* OpenType/CFF fonts. It is limited to 256 character codes. */
/* */
/* FT_ENCODING_ADOBE_EXPERT :: */
/* Adobe Expert encoding, as found in Type~1, CFF, and OpenType/CFF */
/* fonts. It is limited to 256 character codes. */
/* */
/* FT_ENCODING_ADOBE_CUSTOM :: */
/* Corresponds to a custom encoding, as found in Type~1, CFF, and */
/* OpenType/CFF fonts. It is limited to 256 character codes. */
/* */
/* FT_ENCODING_APPLE_ROMAN :: */
/* Apple roman encoding. Many TrueType and OpenType fonts contain */
/* a charmap for this 8-bit encoding, since older versions of Mac */
/* OS are able to use it. */
/* */
/* FT_ENCODING_OLD_LATIN_2 :: */
/* This value is deprecated and was neither used nor reported by */
/* FreeType. Don't use or test for it. */
/* */
/* FT_ENCODING_MS_SJIS :: */
/* Same as FT_ENCODING_SJIS. Deprecated. */
/* */
/* FT_ENCODING_MS_GB2312 :: */
/* Same as FT_ENCODING_PRC. Deprecated. */
/* */
/* FT_ENCODING_MS_BIG5 :: */
/* Same as FT_ENCODING_BIG5. Deprecated. */
/* */
/* FT_ENCODING_MS_WANSUNG :: */
/* Same as FT_ENCODING_WANSUNG. Deprecated. */
/* */
/* FT_ENCODING_MS_JOHAB :: */
/* Same as FT_ENCODING_JOHAB. Deprecated. */
/* */
/* <Note> */
/* By default, FreeType enables a Unicode charmap and tags it with */
/* FT_ENCODING_UNICODE when it is either provided or can be generated */
/* from PostScript glyph name dictionaries in the font file. */
/* All other encodings are considered legacy and tagged only if */
/* explicitly defined in the font file. Otherwise, FT_ENCODING_NONE */
/* is used. */
/* */
/* FT_ENCODING_NONE is set by the BDF and PCF drivers if the charmap */
/* is neither Unicode nor ISO-8859-1 (otherwise it is set to */
/* FT_ENCODING_UNICODE). Use @FT_Get_BDF_Charset_ID to find out */
/* which encoding is really present. If, for example, the */
/* `cs_registry' field is `KOI8' and the `cs_encoding' field is `R', */
/* the font is encoded in KOI8-R. */
/* */
/* FT_ENCODING_NONE is always set (with a single exception) by the */
/* winfonts driver. Use @FT_Get_WinFNT_Header and examine the */
/* `charset' field of the @FT_WinFNT_HeaderRec structure to find out */
/* which encoding is really present. For example, */
/* @FT_WinFNT_ID_CP1251 (204) means Windows code page 1251 (for */
/* Russian). */
/* */
/* FT_ENCODING_NONE is set if `platform_id' is @TT_PLATFORM_MACINTOSH */
/* and `encoding_id' is not `TT_MAC_ID_ROMAN' (otherwise it is set to */
/* FT_ENCODING_APPLE_ROMAN). */
/* */
/* If `platform_id' is @TT_PLATFORM_MACINTOSH, use the function */
/* @FT_Get_CMap_Language_ID to query the Mac language ID that may */
/* be needed to be able to distinguish Apple encoding variants. See */
/* */
/* https://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/Readme.txt */
/* */
/* to get an idea how to do that. Basically, if the language ID */
/* is~0, don't use it, otherwise subtract 1 from the language ID. */
/* Then examine `encoding_id'. If, for example, `encoding_id' is */
/* `TT_MAC_ID_ROMAN' and the language ID (minus~1) is */
/* `TT_MAC_LANGID_GREEK', it is the Greek encoding, not Roman. */
/* `TT_MAC_ID_ARABIC' with `TT_MAC_LANGID_FARSI' means the Farsi */
/* variant the Arabic encoding. */
/* */
typedef enum FT_Encoding_
{
FT_ENC_TAG( FT_ENCODING_NONE, 0, 0, 0, 0 ),
FT_ENC_TAG( FT_ENCODING_MS_SYMBOL, 's', 'y', 'm', 'b' ),
FT_ENC_TAG( FT_ENCODING_UNICODE, 'u', 'n', 'i', 'c' ),
FT_ENC_TAG( FT_ENCODING_SJIS, 's', 'j', 'i', 's' ),
FT_ENC_TAG( FT_ENCODING_PRC, 'g', 'b', ' ', ' ' ),
FT_ENC_TAG( FT_ENCODING_BIG5, 'b', 'i', 'g', '5' ),
FT_ENC_TAG( FT_ENCODING_WANSUNG, 'w', 'a', 'n', 's' ),
FT_ENC_TAG( FT_ENCODING_JOHAB, 'j', 'o', 'h', 'a' ),
/* for backward compatibility */
FT_ENCODING_GB2312 = FT_ENCODING_PRC,
FT_ENCODING_MS_SJIS = FT_ENCODING_SJIS,
FT_ENCODING_MS_GB2312 = FT_ENCODING_PRC,
FT_ENCODING_MS_BIG5 = FT_ENCODING_BIG5,
FT_ENCODING_MS_WANSUNG = FT_ENCODING_WANSUNG,
FT_ENCODING_MS_JOHAB = FT_ENCODING_JOHAB,
FT_ENC_TAG( FT_ENCODING_ADOBE_STANDARD, 'A', 'D', 'O', 'B' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_EXPERT, 'A', 'D', 'B', 'E' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_CUSTOM, 'A', 'D', 'B', 'C' ),
FT_ENC_TAG( FT_ENCODING_ADOBE_LATIN_1, 'l', 'a', 't', '1' ),
FT_ENC_TAG( FT_ENCODING_OLD_LATIN_2, 'l', 'a', 't', '2' ),
FT_ENC_TAG( FT_ENCODING_APPLE_ROMAN, 'a', 'r', 'm', 'n' )
} FT_Encoding;
/* these constants are deprecated; use the corresponding `FT_Encoding' */
/* values instead */
#define ft_encoding_none FT_ENCODING_NONE
#define ft_encoding_unicode FT_ENCODING_UNICODE
#define ft_encoding_symbol FT_ENCODING_MS_SYMBOL
#define ft_encoding_latin_1 FT_ENCODING_ADOBE_LATIN_1
#define ft_encoding_latin_2 FT_ENCODING_OLD_LATIN_2
#define ft_encoding_sjis FT_ENCODING_SJIS
#define ft_encoding_gb2312 FT_ENCODING_PRC
#define ft_encoding_big5 FT_ENCODING_BIG5
#define ft_encoding_wansung FT_ENCODING_WANSUNG
#define ft_encoding_johab FT_ENCODING_JOHAB
#define ft_encoding_adobe_standard FT_ENCODING_ADOBE_STANDARD
#define ft_encoding_adobe_expert FT_ENCODING_ADOBE_EXPERT
#define ft_encoding_adobe_custom FT_ENCODING_ADOBE_CUSTOM
#define ft_encoding_apple_roman FT_ENCODING_APPLE_ROMAN
/*************************************************************************/
/* */
/* <Struct> */
/* FT_CharMapRec */
/* */
/* <Description> */
/* The base charmap structure. */
/* */
/* <Fields> */
/* face :: A handle to the parent face object. */
/* */
/* encoding :: An @FT_Encoding tag identifying the charmap. Use */
/* this with @FT_Select_Charmap. */
/* */
/* platform_id :: An ID number describing the platform for the */
/* following encoding ID. This comes directly from */
/* the TrueType specification and gets emulated for */
/* other formats. */
/* */
/* encoding_id :: A platform specific encoding number. This also */
/* comes from the TrueType specification and gets */
/* emulated similarly. */
/* */
typedef struct FT_CharMapRec_
{
FT_Face face;
FT_Encoding encoding;
FT_UShort platform_id;
FT_UShort encoding_id;
} FT_CharMapRec;
/*************************************************************************/
/*************************************************************************/
/* */
/* B A S E O B J E C T C L A S S E S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FT_Face_Internal */
/* */
/* <Description> */
/* An opaque handle to an `FT_Face_InternalRec' structure that models */
/* the private data of a given @FT_Face object. */
/* */
/* This structure might change between releases of FreeType~2 and is */
/* not generally available to client applications. */
/* */
typedef struct FT_Face_InternalRec_* FT_Face_Internal;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_FaceRec */
/* */
/* <Description> */
/* FreeType root face class structure. A face object models a */
/* typeface in a font file. */
/* */
/* <Fields> */
/* num_faces :: The number of faces in the font file. Some */
/* font formats can have multiple faces in */
/* a single font file. */
/* */
/* face_index :: This field holds two different values. */
/* Bits 0-15 are the index of the face in the */
/* font file (starting with value~0). They */
/* are set to~0 if there is only one face in */
/* the font file. */
/* */
/* [Since 2.6.1] Bits 16-30 are relevant to GX */
/* and OpenType variation fonts only, holding */
/* the named instance index for the current */
/* face index (starting with value~1; value~0 */
/* indicates font access without a named */
/* instance). For non-variation fonts, bits */
/* 16-30 are ignored. If we have the third */
/* named instance of face~4, say, `face_index' */
/* is set to 0x00030004. */
/* */
/* Bit 31 is always zero (this is, */
/* `face_index' is always a positive value). */
/* */
/* [Since 2.9] Changing the design coordinates */
/* with @FT_Set_Var_Design_Coordinates or */
/* @FT_Set_Var_Blend_Coordinates does not */
/* influence the named instance index value */
/* (only @FT_Set_Named_Instance does that). */
/* */
/* face_flags :: A set of bit flags that give important */
/* information about the face; see */
/* @FT_FACE_FLAG_XXX for the details. */
/* */
/* style_flags :: The lower 16~bits contain a set of bit */
/* flags indicating the style of the face; see */
/* @FT_STYLE_FLAG_XXX for the details. */
/* */
/* [Since 2.6.1] Bits 16-30 hold the number */
/* of named instances available for the */
/* current face if we have a GX or OpenType */
/* variation (sub)font. Bit 31 is always zero */
/* (this is, `style_flags' is always a */
/* positive value). Note that a variation */
/* font has always at least one named */
/* instance, namely the default instance. */
/* */
/* num_glyphs :: The number of glyphs in the face. If the */
/* face is scalable and has sbits (see */
/* `num_fixed_sizes'), it is set to the number */
/* of outline glyphs. */
/* */
/* For CID-keyed fonts (not in an SFNT */
/* wrapper) this value gives the highest CID */
/* used in the font. */
/* */
/* family_name :: The face's family name. This is an ASCII */
/* string, usually in English, that describes */
/* the typeface's family (like `Times New */
/* Roman', `Bodoni', `Garamond', etc). This */
/* is a least common denominator used to list */
/* fonts. Some formats (TrueType & OpenType) */
/* provide localized and Unicode versions of */
/* this string. Applications should use the */
/* format specific interface to access them. */
/* Can be NULL (e.g., in fonts embedded in a */
/* PDF file). */
/* */
/* In case the font doesn't provide a specific */
/* family name entry, FreeType tries to */
/* synthesize one, deriving it from other name */
/* entries. */
/* */
/* style_name :: The face's style name. This is an ASCII */
/* string, usually in English, that describes */
/* the typeface's style (like `Italic', */
/* `Bold', `Condensed', etc). Not all font */
/* formats provide a style name, so this field */
/* is optional, and can be set to NULL. As */
/* for `family_name', some formats provide */
/* localized and Unicode versions of this */
/* string. Applications should use the format */
/* specific interface to access them. */
/* */
/* num_fixed_sizes :: The number of bitmap strikes in the face. */
/* Even if the face is scalable, there might */
/* still be bitmap strikes, which are called */
/* `sbits' in that case. */
/* */
/* available_sizes :: An array of @FT_Bitmap_Size for all bitmap */
/* strikes in the face. It is set to NULL if */
/* there is no bitmap strike. */
/* */
/* Note that FreeType tries to sanitize the */
/* strike data since they are sometimes sloppy */
/* or incorrect, but this can easily fail. */
/* */
/* num_charmaps :: The number of charmaps in the face. */
/* */
/* charmaps :: An array of the charmaps of the face. */
/* */
/* generic :: A field reserved for client uses. See the */
/* @FT_Generic type description. */
/* */
/* bbox :: The font bounding box. Coordinates are */
/* expressed in font units (see */
/* `units_per_EM'). The box is large enough */
/* to contain any glyph from the font. Thus, */
/* `bbox.yMax' can be seen as the `maximum */
/* ascender', and `bbox.yMin' as the `minimum */
/* descender'. Only relevant for scalable */
/* formats. */
/* */
/* Note that the bounding box might be off by */
/* (at least) one pixel for hinted fonts. See */
/* @FT_Size_Metrics for further discussion. */
/* */
/* units_per_EM :: The number of font units per EM square for */
/* this face. This is typically 2048 for */
/* TrueType fonts, and 1000 for Type~1 fonts. */
/* Only relevant for scalable formats. */
/* */
/* ascender :: The typographic ascender of the face, */
/* expressed in font units. For font formats */
/* not having this information, it is set to */
/* `bbox.yMax'. Only relevant for scalable */
/* formats. */
/* */
/* descender :: The typographic descender of the face, */
/* expressed in font units. For font formats */
/* not having this information, it is set to */
/* `bbox.yMin'. Note that this field is */
/* negative for values below the baseline. */
/* Only relevant for scalable formats. */
/* */
/* height :: This value is the vertical distance */
/* between two consecutive baselines, */
/* expressed in font units. It is always */
/* positive. Only relevant for scalable */
/* formats. */
/* */
/* If you want the global glyph height, use */
/* `ascender - descender'. */
/* */
/* max_advance_width :: The maximum advance width, in font units, */
/* for all glyphs in this face. This can be */
/* used to make word wrapping computations */
/* faster. Only relevant for scalable */
/* formats. */
/* */
/* max_advance_height :: The maximum advance height, in font units, */
/* for all glyphs in this face. This is only */
/* relevant for vertical layouts, and is set */
/* to `height' for fonts that do not provide */
/* vertical metrics. Only relevant for */
/* scalable formats. */
/* */
/* underline_position :: The position, in font units, of the */
/* underline line for this face. It is the */
/* center of the underlining stem. Only */
/* relevant for scalable formats. */
/* */
/* underline_thickness :: The thickness, in font units, of the */
/* underline for this face. Only relevant for */
/* scalable formats. */
/* */
/* glyph :: The face's associated glyph slot(s). */
/* */
/* size :: The current active size for this face. */
/* */
/* charmap :: The current active charmap for this face. */
/* */
/* <Note> */
/* Fields may be changed after a call to @FT_Attach_File or */
/* @FT_Attach_Stream. */
/* */
/* For an OpenType variation font, the values of the following fields */
/* can change after a call to @FT_Set_Var_Design_Coordinates (and */
/* friends) if the font contains an `MVAR' table: `ascender', */
/* `descender', `height', `underline_position', and */
/* `underline_thickness'. */
/* */
/* Especially for TrueType fonts see also the documentation for */
/* @FT_Size_Metrics. */
/* */
typedef struct FT_FaceRec_
{
FT_Long num_faces;
FT_Long face_index;
FT_Long face_flags;
FT_Long style_flags;
FT_Long num_glyphs;
FT_String* family_name;
FT_String* style_name;
FT_Int num_fixed_sizes;
FT_Bitmap_Size* available_sizes;
FT_Int num_charmaps;
FT_CharMap* charmaps;
FT_Generic generic;
/*# The following member variables (down to `underline_thickness') */
/*# are only relevant to scalable outlines; cf. @FT_Bitmap_Size */
/*# for bitmap fonts. */
FT_BBox bbox;
FT_UShort units_per_EM;
FT_Short ascender;
FT_Short descender;
FT_Short height;
FT_Short max_advance_width;
FT_Short max_advance_height;
FT_Short underline_position;
FT_Short underline_thickness;
FT_GlyphSlot glyph;
FT_Size size;
FT_CharMap charmap;
/*@private begin */
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_ListRec sizes_list;
FT_Generic autohint; /* face-specific auto-hinter data */
void* extensions; /* unused */
FT_Face_Internal internal;
/*@private end */
} FT_FaceRec;
/*************************************************************************/
/* */
/* <Enum> */
/* FT_FACE_FLAG_XXX */
/* */
/* <Description> */
/* A list of bit flags used in the `face_flags' field of the */
/* @FT_FaceRec structure. They inform client applications of */
/* properties of the corresponding face. */
/* */
/* <Values> */
/* FT_FACE_FLAG_SCALABLE :: */
/* The face contains outline glyphs. Note that a face can contain */
/* bitmap strikes also, i.e., a face can have both this flag and */
/* @FT_FACE_FLAG_FIXED_SIZES set. */
/* */
/* FT_FACE_FLAG_FIXED_SIZES :: */
/* The face contains bitmap strikes. See also the */
/* `num_fixed_sizes' and `available_sizes' fields of @FT_FaceRec. */
/* */
/* FT_FACE_FLAG_FIXED_WIDTH :: */
/* The face contains fixed-width characters (like Courier, Lucida, */
/* MonoType, etc.). */
/* */
/* FT_FACE_FLAG_SFNT :: */
/* The face uses the SFNT storage scheme. For now, this means */
/* TrueType and OpenType. */
/* */
/* FT_FACE_FLAG_HORIZONTAL :: */
/* The face contains horizontal glyph metrics. This should be set */
/* for all common formats. */
/* */
/* FT_FACE_FLAG_VERTICAL :: */
/* The face contains vertical glyph metrics. This is only */
/* available in some formats, not all of them. */
/* */
/* FT_FACE_FLAG_KERNING :: */
/* The face contains kerning information. If set, the kerning */
/* distance can be retrieved using the function @FT_Get_Kerning. */
/* Otherwise the function always return the vector (0,0). Note */
/* that FreeType doesn't handle kerning data from the SFNT `GPOS' */
/* table (as present in many OpenType fonts). */
/* */
/* FT_FACE_FLAG_FAST_GLYPHS :: */
/* THIS FLAG IS DEPRECATED. DO NOT USE OR TEST IT. */
/* */
/* FT_FACE_FLAG_MULTIPLE_MASTERS :: */
/* The face contains multiple masters and is capable of */
/* interpolating between them. Supported formats are Adobe MM, */
/* TrueType GX, and OpenType variation fonts. */
/* */
/* See section @multiple_masters for API details. */
/* */
/* FT_FACE_FLAG_GLYPH_NAMES :: */
/* The face contains glyph names, which can be retrieved using */
/* @FT_Get_Glyph_Name. Note that some TrueType fonts contain */
/* broken glyph name tables. Use the function */
/* @FT_Has_PS_Glyph_Names when needed. */
/* */
/* FT_FACE_FLAG_EXTERNAL_STREAM :: */
/* Used internally by FreeType to indicate that a face's stream was */
/* provided by the client application and should not be destroyed */
/* when @FT_Done_Face is called. Don't read or test this flag. */
/* */
/* FT_FACE_FLAG_HINTER :: */
/* The font driver has a hinting machine of its own. For example, */
/* with TrueType fonts, it makes sense to use data from the SFNT */
/* `gasp' table only if the native TrueType hinting engine (with */
/* the bytecode interpreter) is available and active. */
/* */
/* FT_FACE_FLAG_CID_KEYED :: */
/* The face is CID-keyed. In that case, the face is not accessed */
/* by glyph indices but by CID values. For subsetted CID-keyed */
/* fonts this has the consequence that not all index values are a */
/* valid argument to @FT_Load_Glyph. Only the CID values for which */
/* corresponding glyphs in the subsetted font exist make */
/* `FT_Load_Glyph' return successfully; in all other cases you get */
/* an `FT_Err_Invalid_Argument' error. */
/* */
/* Note that CID-keyed fonts that are in an SFNT wrapper (this is, */
/* all OpenType/CFF fonts) don't have this flag set since the */
/* glyphs are accessed in the normal way (using contiguous */
/* indices); the `CID-ness' isn't visible to the application. */
/* */
/* FT_FACE_FLAG_TRICKY :: */
/* The face is `tricky', this is, it always needs the font format's */
/* native hinting engine to get a reasonable result. A typical */
/* example is the old Chinese font `mingli.ttf' (but not */
/* `mingliu.ttc') that uses TrueType bytecode instructions to move */
/* and scale all of its subglyphs. */
/* */
/* It is not possible to auto-hint such fonts using */
/* @FT_LOAD_FORCE_AUTOHINT; it will also ignore */
/* @FT_LOAD_NO_HINTING. You have to set both @FT_LOAD_NO_HINTING */
/* and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you */
/* probably never want this except for demonstration purposes. */
/* */
/* Currently, there are about a dozen TrueType fonts in the list of */
/* tricky fonts; they are hard-coded in file `ttobjs.c'. */
/* */
/* FT_FACE_FLAG_COLOR :: */
/* [Since 2.5.1] The face has color glyph tables. To access color */
/* glyphs use @FT_LOAD_COLOR. */
/* */
/* FT_FACE_FLAG_VARIATION :: */
/* [Since 2.9] Set if the current face (or named instance) has been */
/* altered with @FT_Set_MM_Design_Coordinates, */
/* @FT_Set_Var_Design_Coordinates, or */
/* @FT_Set_Var_Blend_Coordinates. This flag is unset by a call to */
/* @FT_Set_Named_Instance. */
/* */
#define FT_FACE_FLAG_SCALABLE ( 1L << 0 )
#define FT_FACE_FLAG_FIXED_SIZES ( 1L << 1 )
#define FT_FACE_FLAG_FIXED_WIDTH ( 1L << 2 )
#define FT_FACE_FLAG_SFNT ( 1L << 3 )
#define FT_FACE_FLAG_HORIZONTAL ( 1L << 4 )
#define FT_FACE_FLAG_VERTICAL ( 1L << 5 )
#define FT_FACE_FLAG_KERNING ( 1L << 6 )
#define FT_FACE_FLAG_FAST_GLYPHS ( 1L << 7 )
#define FT_FACE_FLAG_MULTIPLE_MASTERS ( 1L << 8 )
#define FT_FACE_FLAG_GLYPH_NAMES ( 1L << 9 )
#define FT_FACE_FLAG_EXTERNAL_STREAM ( 1L << 10 )
#define FT_FACE_FLAG_HINTER ( 1L << 11 )
#define FT_FACE_FLAG_CID_KEYED ( 1L << 12 )
#define FT_FACE_FLAG_TRICKY ( 1L << 13 )
#define FT_FACE_FLAG_COLOR ( 1L << 14 )
#define FT_FACE_FLAG_VARIATION ( 1L << 15 )
/*************************************************************************
*
* @macro:
* FT_HAS_HORIZONTAL( face )
*
* @description:
* A macro that returns true whenever a face object contains
* horizontal metrics (this is true for all font formats though).
*
* @also:
* @FT_HAS_VERTICAL can be used to check for vertical metrics.
*
*/
#define FT_HAS_HORIZONTAL( face ) \
( (face)->face_flags & FT_FACE_FLAG_HORIZONTAL )
/*************************************************************************
*
* @macro:
* FT_HAS_VERTICAL( face )
*
* @description:
* A macro that returns true whenever a face object contains real
* vertical metrics (and not only synthesized ones).
*
*/
#define FT_HAS_VERTICAL( face ) \
( (face)->face_flags & FT_FACE_FLAG_VERTICAL )
/*************************************************************************
*
* @macro:
* FT_HAS_KERNING( face )
*
* @description:
* A macro that returns true whenever a face object contains kerning
* data that can be accessed with @FT_Get_Kerning.
*
*/
#define FT_HAS_KERNING( face ) \
( (face)->face_flags & FT_FACE_FLAG_KERNING )
/*************************************************************************
*
* @macro:
* FT_IS_SCALABLE( face )
*
* @description:
* A macro that returns true whenever a face object contains a scalable
* font face (true for TrueType, Type~1, Type~42, CID, OpenType/CFF,
* and PFR font formats).
*
*/
#define FT_IS_SCALABLE( face ) \
( (face)->face_flags & FT_FACE_FLAG_SCALABLE )
/*************************************************************************
*
* @macro:
* FT_IS_SFNT( face )
*
* @description:
* A macro that returns true whenever a face object contains a font
* whose format is based on the SFNT storage scheme. This usually
* means: TrueType fonts, OpenType fonts, as well as SFNT-based embedded
* bitmap fonts.
*
* If this macro is true, all functions defined in @FT_SFNT_NAMES_H and
* @FT_TRUETYPE_TABLES_H are available.
*
*/
#define FT_IS_SFNT( face ) \
( (face)->face_flags & FT_FACE_FLAG_SFNT )
/*************************************************************************
*
* @macro:
* FT_IS_FIXED_WIDTH( face )
*
* @description:
* A macro that returns true whenever a face object contains a font face
* that contains fixed-width (or `monospace', `fixed-pitch', etc.)
* glyphs.
*
*/
#define FT_IS_FIXED_WIDTH( face ) \
( (face)->face_flags & FT_FACE_FLAG_FIXED_WIDTH )
/*************************************************************************
*
* @macro:
* FT_HAS_FIXED_SIZES( face )
*
* @description:
* A macro that returns true whenever a face object contains some
* embedded bitmaps. See the `available_sizes' field of the
* @FT_FaceRec structure.
*
*/
#define FT_HAS_FIXED_SIZES( face ) \
( (face)->face_flags & FT_FACE_FLAG_FIXED_SIZES )
/*************************************************************************
*
* @macro:
* FT_HAS_FAST_GLYPHS( face )
*
* @description:
* Deprecated.
*
*/
#define FT_HAS_FAST_GLYPHS( face ) 0
/*************************************************************************
*
* @macro:
* FT_HAS_GLYPH_NAMES( face )
*
* @description:
* A macro that returns true whenever a face object contains some glyph
* names that can be accessed through @FT_Get_Glyph_Name.
*
*/
#define FT_HAS_GLYPH_NAMES( face ) \
( (face)->face_flags & FT_FACE_FLAG_GLYPH_NAMES )
/*************************************************************************
*
* @macro:
* FT_HAS_MULTIPLE_MASTERS( face )
*
* @description:
* A macro that returns true whenever a face object contains some
* multiple masters. The functions provided by @FT_MULTIPLE_MASTERS_H
* are then available to choose the exact design you want.
*
*/
#define FT_HAS_MULTIPLE_MASTERS( face ) \
( (face)->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS )
/*************************************************************************
*
* @macro:
* FT_IS_NAMED_INSTANCE( face )
*
* @description:
* A macro that returns true whenever a face object is a named instance
* of a GX or OpenType variation font.
*
* [Since 2.9] Changing the design coordinates with
* @FT_Set_Var_Design_Coordinates or @FT_Set_Var_Blend_Coordinates does
* not influence the return value of this macro (only
* @FT_Set_Named_Instance does that).
*
* @since:
* 2.7
*
*/
#define FT_IS_NAMED_INSTANCE( face ) \
( (face)->face_index & 0x7FFF0000L )
/*************************************************************************
*
* @macro:
* FT_IS_VARIATION( face )
*
* @description:
* A macro that returns true whenever a face object has been altered
* by @FT_Set_MM_Design_Coordinates, @FT_Set_Var_Design_Coordinates, or
* @FT_Set_Var_Blend_Coordinates.
*
* @since:
* 2.9
*
*/
#define FT_IS_VARIATION( face ) \
( (face)->face_flags & FT_FACE_FLAG_VARIATION )
/*************************************************************************
*
* @macro:
* FT_IS_CID_KEYED( face )
*
* @description:
* A macro that returns true whenever a face object contains a CID-keyed
* font. See the discussion of @FT_FACE_FLAG_CID_KEYED for more
* details.
*
* If this macro is true, all functions defined in @FT_CID_H are
* available.
*
*/
#define FT_IS_CID_KEYED( face ) \
( (face)->face_flags & FT_FACE_FLAG_CID_KEYED )
/*************************************************************************
*
* @macro:
* FT_IS_TRICKY( face )
*
* @description:
* A macro that returns true whenever a face represents a `tricky' font.
* See the discussion of @FT_FACE_FLAG_TRICKY for more details.
*
*/
#define FT_IS_TRICKY( face ) \
( (face)->face_flags & FT_FACE_FLAG_TRICKY )
/*************************************************************************
*
* @macro:
* FT_HAS_COLOR( face )
*
* @description:
* A macro that returns true whenever a face object contains
* tables for color glyphs.
*
* @since:
* 2.5.1
*
*/
#define FT_HAS_COLOR( face ) \
( (face)->face_flags & FT_FACE_FLAG_COLOR )
/*************************************************************************/
/* */
/* <Const> */
/* FT_STYLE_FLAG_XXX */
/* */
/* <Description> */
/* A list of bit flags to indicate the style of a given face. These */
/* are used in the `style_flags' field of @FT_FaceRec. */
/* */
/* <Values> */
/* FT_STYLE_FLAG_ITALIC :: */
/* The face style is italic or oblique. */
/* */
/* FT_STYLE_FLAG_BOLD :: */
/* The face is bold. */
/* */
/* <Note> */
/* The style information as provided by FreeType is very basic. More */
/* details are beyond the scope and should be done on a higher level */
/* (for example, by analyzing various fields of the `OS/2' table in */
/* SFNT based fonts). */
/* */
#define FT_STYLE_FLAG_ITALIC ( 1 << 0 )
#define FT_STYLE_FLAG_BOLD ( 1 << 1 )
/*************************************************************************/
/* */
/* <Type> */
/* FT_Size_Internal */
/* */
/* <Description> */
/* An opaque handle to an `FT_Size_InternalRec' structure, used to */
/* model private data of a given @FT_Size object. */
/* */
typedef struct FT_Size_InternalRec_* FT_Size_Internal;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Size_Metrics */
/* */
/* <Description> */
/* The size metrics structure gives the metrics of a size object. */
/* */
/* <Fields> */
/* x_ppem :: The width of the scaled EM square in pixels, hence */
/* the term `ppem' (pixels per EM). It is also */
/* referred to as `nominal width'. */
/* */
/* y_ppem :: The height of the scaled EM square in pixels, */
/* hence the term `ppem' (pixels per EM). It is also */
/* referred to as `nominal height'. */
/* */
/* x_scale :: A 16.16 fractional scaling value to convert */
/* horizontal metrics from font units to 26.6 */
/* fractional pixels. Only relevant for scalable */
/* font formats. */
/* */
/* y_scale :: A 16.16 fractional scaling value to convert */
/* vertical metrics from font units to 26.6 */
/* fractional pixels. Only relevant for scalable */
/* font formats. */
/* */
/* ascender :: The ascender in 26.6 fractional pixels, rounded up */
/* to an integer value. See @FT_FaceRec for the */
/* details. */
/* */
/* descender :: The descender in 26.6 fractional pixels, rounded */
/* down to an integer value. See @FT_FaceRec for the */
/* details. */
/* */
/* height :: The height in 26.6 fractional pixels, rounded to */
/* an integer value. See @FT_FaceRec for the */
/* details. */
/* */
/* max_advance :: The maximum advance width in 26.6 fractional */
/* pixels, rounded to an integer value. See */
/* @FT_FaceRec for the details. */
/* */
/* <Note> */
/* The scaling values, if relevant, are determined first during a */
/* size changing operation. The remaining fields are then set by the */
/* driver. For scalable formats, they are usually set to scaled */
/* values of the corresponding fields in @FT_FaceRec. Some values */
/* like ascender or descender are rounded for historical reasons; */
/* more precise values (for outline fonts) can be derived by scaling */
/* the corresponding @FT_FaceRec values manually, with code similar */
/* to the following. */
/* */
/* { */
/* scaled_ascender = FT_MulFix( face->ascender, */
/* size_metrics->y_scale ); */
/* } */
/* */
/* Note that due to glyph hinting and the selected rendering mode */
/* these values are usually not exact; consequently, they must be */
/* treated as unreliable with an error margin of at least one pixel! */
/* */
/* Indeed, the only way to get the exact metrics is to render _all_ */
/* glyphs. As this would be a definite performance hit, it is up to */
/* client applications to perform such computations. */
/* */
/* The `FT_Size_Metrics' structure is valid for bitmap fonts also. */
/* */
/* */
/* *TrueType* *fonts* *with* *native* *bytecode* *hinting* */
/* */
/* All applications that handle TrueType fonts with native hinting */
/* must be aware that TTFs expect different rounding of vertical font */
/* dimensions. The application has to cater for this, especially if */
/* it wants to rely on a TTF's vertical data (for example, to */
/* properly align box characters vertically). */
/* */
/* Only the application knows _in_ _advance_ that it is going to use */
/* native hinting for TTFs! FreeType, on the other hand, selects the */
/* hinting mode not at the time of creating an @FT_Size object but */
/* much later, namely while calling @FT_Load_Glyph. */
/* */
/* Here is some pseudo code that illustrates a possible solution. */
/* */
/* { */
/* font_format = FT_Get_Font_Format( face ); */
/* */
/* if ( !strcmp( font_format, "TrueType" ) && */
/* do_native_bytecode_hinting ) */
/* { */
/* ascender = ROUND( FT_MulFix( face->ascender, */
/* size_metrics->y_scale ) ); */
/* descender = ROUND( FT_MulFix( face->descender, */
/* size_metrics->y_scale ) ); */
/* } */
/* else */
/* { */
/* ascender = size_metrics->ascender; */
/* descender = size_metrics->descender; */
/* } */
/* */
/* height = size_metrics->height; */
/* max_advance = size_metrics->max_advance; */
/* } */
/* */
typedef struct FT_Size_Metrics_
{
FT_UShort x_ppem; /* horizontal pixels per EM */
FT_UShort y_ppem; /* vertical pixels per EM */
FT_Fixed x_scale; /* scaling values used to convert font */
FT_Fixed y_scale; /* units to 26.6 fractional pixels */
FT_Pos ascender; /* ascender in 26.6 frac. pixels */
FT_Pos descender; /* descender in 26.6 frac. pixels */
FT_Pos height; /* text height in 26.6 frac. pixels */
FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */
} FT_Size_Metrics;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_SizeRec */
/* */
/* <Description> */
/* FreeType root size class structure. A size object models a face */
/* object at a given size. */
/* */
/* <Fields> */
/* face :: Handle to the parent face object. */
/* */
/* generic :: A typeless pointer, unused by the FreeType library or */
/* any of its drivers. It can be used by client */
/* applications to link their own data to each size */
/* object. */
/* */
/* metrics :: Metrics for this size object. This field is read-only. */
/* */
typedef struct FT_SizeRec_
{
FT_Face face; /* parent face object */
FT_Generic generic; /* generic pointer for client uses */
FT_Size_Metrics metrics; /* size metrics */
FT_Size_Internal internal;
} FT_SizeRec;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_SubGlyph */
/* */
/* <Description> */
/* The subglyph structure is an internal object used to describe */
/* subglyphs (for example, in the case of composites). */
/* */
/* <Note> */
/* The subglyph implementation is not part of the high-level API, */
/* hence the forward structure declaration. */
/* */
/* You can however retrieve subglyph information with */
/* @FT_Get_SubGlyph_Info. */
/* */
typedef struct FT_SubGlyphRec_* FT_SubGlyph;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Slot_Internal */
/* */
/* <Description> */
/* An opaque handle to an `FT_Slot_InternalRec' structure, used to */
/* model private data of a given @FT_GlyphSlot object. */
/* */
typedef struct FT_Slot_InternalRec_* FT_Slot_Internal;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_GlyphSlotRec */
/* */
/* <Description> */
/* FreeType root glyph slot class structure. A glyph slot is a */
/* container where individual glyphs can be loaded, be they in */
/* outline or bitmap format. */
/* */
/* <Fields> */
/* library :: A handle to the FreeType library instance */
/* this slot belongs to. */
/* */
/* face :: A handle to the parent face object. */
/* */
/* next :: In some cases (like some font tools), several */
/* glyph slots per face object can be a good */
/* thing. As this is rare, the glyph slots are */
/* listed through a direct, single-linked list */
/* using its `next' field. */
/* */
/* generic :: A typeless pointer unused by the FreeType */
/* library or any of its drivers. It can be */
/* used by client applications to link their own */
/* data to each glyph slot object. */
/* */
/* metrics :: The metrics of the last loaded glyph in the */
/* slot. The returned values depend on the last */
/* load flags (see the @FT_Load_Glyph API */
/* function) and can be expressed either in 26.6 */
/* fractional pixels or font units. */
/* */
/* Note that even when the glyph image is */
/* transformed, the metrics are not. */
/* */
/* linearHoriAdvance :: The advance width of the unhinted glyph. */
/* Its value is expressed in 16.16 fractional */
/* pixels, unless @FT_LOAD_LINEAR_DESIGN is set */
/* when loading the glyph. This field can be */
/* important to perform correct WYSIWYG layout. */
/* Only relevant for outline glyphs. */
/* */
/* linearVertAdvance :: The advance height of the unhinted glyph. */
/* Its value is expressed in 16.16 fractional */
/* pixels, unless @FT_LOAD_LINEAR_DESIGN is set */
/* when loading the glyph. This field can be */
/* important to perform correct WYSIWYG layout. */
/* Only relevant for outline glyphs. */
/* */
/* advance :: This shorthand is, depending on */
/* @FT_LOAD_IGNORE_TRANSFORM, the transformed */
/* (hinted) advance width for the glyph, in 26.6 */
/* fractional pixel format. As specified with */
/* @FT_LOAD_VERTICAL_LAYOUT, it uses either the */
/* `horiAdvance' or the `vertAdvance' value of */
/* `metrics' field. */
/* */
/* format :: This field indicates the format of the image */
/* contained in the glyph slot. Typically */
/* @FT_GLYPH_FORMAT_BITMAP, */
/* @FT_GLYPH_FORMAT_OUTLINE, or */
/* @FT_GLYPH_FORMAT_COMPOSITE, but other values */
/* are possible. */
/* */
/* bitmap :: This field is used as a bitmap descriptor. */
/* Note that the address and content of the */
/* bitmap buffer can change between calls of */
/* @FT_Load_Glyph and a few other functions. */
/* */
/* bitmap_left :: The bitmap's left bearing expressed in */
/* integer pixels. */
/* */
/* bitmap_top :: The bitmap's top bearing expressed in integer */
/* pixels. This is the distance from the */
/* baseline to the top-most glyph scanline, */
/* upwards y~coordinates being *positive*. */
/* */
/* outline :: The outline descriptor for the current glyph */
/* image if its format is */
/* @FT_GLYPH_FORMAT_OUTLINE. Once a glyph is */
/* loaded, `outline' can be transformed, */
/* distorted, emboldened, etc. However, it must */
/* not be freed. */
/* */
/* num_subglyphs :: The number of subglyphs in a composite glyph. */
/* This field is only valid for the composite */
/* glyph format that should normally only be */
/* loaded with the @FT_LOAD_NO_RECURSE flag. */
/* */
/* subglyphs :: An array of subglyph descriptors for */
/* composite glyphs. There are `num_subglyphs' */
/* elements in there. Currently internal to */
/* FreeType. */
/* */
/* control_data :: Certain font drivers can also return the */
/* control data for a given glyph image (e.g. */
/* TrueType bytecode, Type~1 charstrings, etc.). */
/* This field is a pointer to such data; it is */
/* currently internal to FreeType. */
/* */
/* control_len :: This is the length in bytes of the control */
/* data. Currently internal to FreeType. */
/* */
/* other :: Reserved. */
/* */
/* lsb_delta :: The difference between hinted and unhinted */
/* left side bearing while auto-hinting is */
/* active. Zero otherwise. */
/* */
/* rsb_delta :: The difference between hinted and unhinted */
/* right side bearing while auto-hinting is */
/* active. Zero otherwise. */
/* */
/* <Note> */
/* If @FT_Load_Glyph is called with default flags (see */
/* @FT_LOAD_DEFAULT) the glyph image is loaded in the glyph slot in */
/* its native format (e.g., an outline glyph for TrueType and Type~1 */
/* formats). [Since 2.9] The prospective bitmap metrics are */
/* calculated according to @FT_LOAD_TARGET_XXX and other flags even */
/* for the outline glyph, even if @FT_LOAD_RENDER is not set. */
/* */
/* This image can later be converted into a bitmap by calling */
/* @FT_Render_Glyph. This function searches the current renderer for */
/* the native image's format, then invokes it. */
/* */
/* The renderer is in charge of transforming the native image through */
/* the slot's face transformation fields, then converting it into a */
/* bitmap that is returned in `slot->bitmap'. */
/* */
/* Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */
/* to specify the position of the bitmap relative to the current pen */
/* position (e.g., coordinates (0,0) on the baseline). Of course, */
/* `slot->format' is also changed to @FT_GLYPH_FORMAT_BITMAP. */
/* */
/* Here is a small pseudo code fragment that shows how to use */
/* `lsb_delta' and `rsb_delta' to do fractional positioning of */
/* glyphs: */
/* */
/* { */
/* FT_GlyphSlot slot = face->glyph; */
/* FT_Pos origin_x = 0; */
/* */
/* */
/* for all glyphs do */
/* <load glyph with `FT_Load_Glyph'> */
/* */
/* FT_Outline_Translate( slot->outline, origin_x & 63, 0 ); */
/* */
/* <save glyph image, or render glyph, or ...> */
/* */
/* <compute kern between current and next glyph */
/* and add it to `origin_x'> */
/* */
/* origin_x += slot->advance.x; */
/* origin_x += slot->rsb_delta - slot->lsb_delta; */
/* endfor */
/* } */
/* */
/* Here is another small pseudo code fragment that shows how to use */
/* `lsb_delta' and `rsb_delta' to improve integer positioning of */
/* glyphs: */
/* */
/* { */
/* FT_GlyphSlot slot = face->glyph; */
/* FT_Pos origin_x = 0; */
/* FT_Pos prev_rsb_delta = 0; */
/* */
/* */
/* for all glyphs do */
/* <compute kern between current and previous glyph */
/* and add it to `origin_x'> */
/* */
/* <load glyph with `FT_Load_Glyph'> */
/* */
/* if ( prev_rsb_delta - slot->lsb_delta > 32 ) */
/* origin_x -= 64; */
/* else if ( prev_rsb_delta - slot->lsb_delta < -31 ) */
/* origin_x += 64; */
/* */
/* prev_rsb_delta = slot->rsb_delta; */
/* */
/* <save glyph image, or render glyph, or ...> */
/* */
/* origin_x += slot->advance.x; */
/* endfor */
/* } */
/* */
/* If you use strong auto-hinting, you *must* apply these delta */
/* values! Otherwise you will experience far too large inter-glyph */
/* spacing at small rendering sizes in most cases. Note that it */
/* doesn't harm to use the above code for other hinting modes also, */
/* since the delta values are zero then. */
/* */
typedef struct FT_GlyphSlotRec_
{
FT_Library library;
FT_Face face;
FT_GlyphSlot next;
FT_UInt reserved; /* retained for binary compatibility */
FT_Generic generic;
FT_Glyph_Metrics metrics;
FT_Fixed linearHoriAdvance;
FT_Fixed linearVertAdvance;
FT_Vector advance;
FT_Glyph_Format format;
FT_Bitmap bitmap;
FT_Int bitmap_left;
FT_Int bitmap_top;
FT_Outline outline;
FT_UInt num_subglyphs;
FT_SubGlyph subglyphs;
void* control_data;
long control_len;
FT_Pos lsb_delta;
FT_Pos rsb_delta;
void* other;
FT_Slot_Internal internal;
} FT_GlyphSlotRec;
/*************************************************************************/
/*************************************************************************/
/* */
/* F U N C T I O N S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* FT_Init_FreeType */
/* */
/* <Description> */
/* Initialize a new FreeType library object. The set of modules */
/* that are registered by this function is determined at build time. */
/* */
/* <Output> */
/* alibrary :: A handle to a new library object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* In case you want to provide your own memory allocating routines, */
/* use @FT_New_Library instead, followed by a call to */
/* @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module) */
/* and @FT_Set_Default_Properties. */
/* */
/* See the documentation of @FT_Library and @FT_Face for */
/* multi-threading issues. */
/* */
/* If you need reference-counting (cf. @FT_Reference_Library), use */
/* @FT_New_Library and @FT_Done_Library. */
/* */
/* If compilation option FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES is */
/* set, this function reads the `FREETYPE_PROPERTIES' environment */
/* variable to control driver properties. See section @properties */
/* for more. */
/* */
FT_EXPORT( FT_Error )
FT_Init_FreeType( FT_Library *alibrary );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_FreeType */
/* */
/* <Description> */
/* Destroy a given FreeType library object and all of its children, */
/* including resources, drivers, faces, sizes, etc. */
/* */
/* <Input> */
/* library :: A handle to the target library object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
FT_EXPORT( FT_Error )
FT_Done_FreeType( FT_Library library );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_OPEN_XXX */
/* */
/* <Description> */
/* A list of bit field constants used within the `flags' field of the */
/* @FT_Open_Args structure. */
/* */
/* <Values> */
/* FT_OPEN_MEMORY :: This is a memory-based stream. */
/* */
/* FT_OPEN_STREAM :: Copy the stream from the `stream' field. */
/* */
/* FT_OPEN_PATHNAME :: Create a new input stream from a C~path */
/* name. */
/* */
/* FT_OPEN_DRIVER :: Use the `driver' field. */
/* */
/* FT_OPEN_PARAMS :: Use the `num_params' and `params' fields. */
/* */
/* <Note> */
/* The `FT_OPEN_MEMORY', `FT_OPEN_STREAM', and `FT_OPEN_PATHNAME' */
/* flags are mutually exclusive. */
/* */
#define FT_OPEN_MEMORY 0x1
#define FT_OPEN_STREAM 0x2
#define FT_OPEN_PATHNAME 0x4
#define FT_OPEN_DRIVER 0x8
#define FT_OPEN_PARAMS 0x10
/* these constants are deprecated; use the corresponding `FT_OPEN_XXX' */
/* values instead */
#define ft_open_memory FT_OPEN_MEMORY
#define ft_open_stream FT_OPEN_STREAM
#define ft_open_pathname FT_OPEN_PATHNAME
#define ft_open_driver FT_OPEN_DRIVER
#define ft_open_params FT_OPEN_PARAMS
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Parameter */
/* */
/* <Description> */
/* A simple structure to pass more or less generic parameters to */
/* @FT_Open_Face and @FT_Face_Properties. */
/* */
/* <Fields> */
/* tag :: A four-byte identification tag. */
/* */
/* data :: A pointer to the parameter data. */
/* */
/* <Note> */
/* The ID and function of parameters are driver-specific. See */
/* section @parameter_tags for more information. */
/* */
typedef struct FT_Parameter_
{
FT_ULong tag;
FT_Pointer data;
} FT_Parameter;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Open_Args */
/* */
/* <Description> */
/* A structure to indicate how to open a new font file or stream. A */
/* pointer to such a structure can be used as a parameter for the */
/* functions @FT_Open_Face and @FT_Attach_Stream. */
/* */
/* <Fields> */
/* flags :: A set of bit flags indicating how to use the */
/* structure. */
/* */
/* memory_base :: The first byte of the file in memory. */
/* */
/* memory_size :: The size in bytes of the file in memory. */
/* */
/* pathname :: A pointer to an 8-bit file pathname. */
/* */
/* stream :: A handle to a source stream object. */
/* */
/* driver :: This field is exclusively used by @FT_Open_Face; */
/* it simply specifies the font driver to use for */
/* opening the face. If set to NULL, FreeType tries */
/* to load the face with each one of the drivers in */
/* its list. */
/* */
/* num_params :: The number of extra parameters. */
/* */
/* params :: Extra parameters passed to the font driver when */
/* opening a new face. */
/* */
/* <Note> */
/* The stream type is determined by the contents of `flags' that */
/* are tested in the following order by @FT_Open_Face: */
/* */
/* If the @FT_OPEN_MEMORY bit is set, assume that this is a */
/* memory file of `memory_size' bytes, located at `memory_address'. */
/* The data are not copied, and the client is responsible for */
/* releasing and destroying them _after_ the corresponding call to */
/* @FT_Done_Face. */
/* */
/* Otherwise, if the @FT_OPEN_STREAM bit is set, assume that a */
/* custom input stream `stream' is used. */
/* */
/* Otherwise, if the @FT_OPEN_PATHNAME bit is set, assume that this */
/* is a normal file and use `pathname' to open it. */
/* */
/* If the @FT_OPEN_DRIVER bit is set, @FT_Open_Face only tries to */
/* open the file with the driver whose handler is in `driver'. */
/* */
/* If the @FT_OPEN_PARAMS bit is set, the parameters given by */
/* `num_params' and `params' is used. They are ignored otherwise. */
/* */
/* Ideally, both the `pathname' and `params' fields should be tagged */
/* as `const'; this is missing for API backward compatibility. In */
/* other words, applications should treat them as read-only. */
/* */
typedef struct FT_Open_Args_
{
FT_UInt flags;
const FT_Byte* memory_base;
FT_Long memory_size;
FT_String* pathname;
FT_Stream stream;
FT_Module driver;
FT_Int num_params;
FT_Parameter* params;
} FT_Open_Args;
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Face */
/* */
/* <Description> */
/* Call @FT_Open_Face to open a font by its pathname. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* pathname :: A path to the font file. */
/* */
/* face_index :: See @FT_Open_Face for a detailed description of this */
/* parameter. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* Use @FT_Done_Face to destroy the created @FT_Face object (along */
/* with its slot and sizes). */
/* */
FT_EXPORT( FT_Error )
FT_New_Face( FT_Library library,
const char* filepathname,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Memory_Face */
/* */
/* <Description> */
/* Call @FT_Open_Face to open a font that has been loaded into */
/* memory. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* file_base :: A pointer to the beginning of the font data. */
/* */
/* file_size :: The size of the memory chunk used by the font data. */
/* */
/* face_index :: See @FT_Open_Face for a detailed description of this */
/* parameter. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* You must not deallocate the memory before calling @FT_Done_Face. */
/* */
FT_EXPORT( FT_Error )
FT_New_Memory_Face( FT_Library library,
const FT_Byte* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Open_Face */
/* */
/* <Description> */
/* Create a face object from a given resource described by */
/* @FT_Open_Args. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* args :: A pointer to an `FT_Open_Args' structure that must */
/* be filled by the caller. */
/* */
/* face_index :: This field holds two different values. Bits 0-15 */
/* are the index of the face in the font file (starting */
/* with value~0). Set it to~0 if there is only one */
/* face in the font file. */
/* */
/* [Since 2.6.1] Bits 16-30 are relevant to GX and */
/* OpenType variation fonts only, specifying the named */
/* instance index for the current face index (starting */
/* with value~1; value~0 makes FreeType ignore named */
/* instances). For non-variation fonts, bits 16-30 are */
/* ignored. Assuming that you want to access the third */
/* named instance in face~4, `face_index' should be set */
/* to 0x00030004. If you want to access face~4 without */
/* variation handling, simply set `face_index' to */
/* value~4. */
/* */
/* `FT_Open_Face' and its siblings can be used to */
/* quickly check whether the font format of a given */
/* font resource is supported by FreeType. In general, */
/* if the `face_index' argument is negative, the */
/* function's return value is~0 if the font format is */
/* recognized, or non-zero otherwise. The function */
/* allocates a more or less empty face handle in */
/* `*aface' (if `aface' isn't NULL); the only two */
/* useful fields in this special case are */
/* `face->num_faces' and `face->style_flags'. For any */
/* negative value of `face_index', `face->num_faces' */
/* gives the number of faces within the font file. For */
/* the negative value `-(N+1)' (with `N' a non-negative */
/* 16-bit value), bits 16-30 in `face->style_flags' */
/* give the number of named instances in face `N' if we */
/* have a variation font (or zero otherwise). After */
/* examination, the returned @FT_Face structure should */
/* be deallocated with a call to @FT_Done_Face. */
/* */
/* <Output> */
/* aface :: A handle to a new face object. If `face_index' is */
/* greater than or equal to zero, it must be non-NULL. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object that can be accessed directly through */
/* `face->glyph'. */
/* */
/* Each new face object created with this function also owns a */
/* default @FT_Size object, accessible as `face->size'. */
/* */
/* One @FT_Library instance can have multiple face objects, this is, */
/* @FT_Open_Face and its siblings can be called multiple times using */
/* the same `library' argument. */
/* */
/* See the discussion of reference counters in the description of */
/* @FT_Reference_Face. */
/* */
/* To loop over all faces, use code similar to the following snippet */
/* (omitting the error handling). */
/* */
/* { */
/* ... */
/* FT_Face face; */
/* FT_Long i, num_faces; */
/* */
/* */
/* error = FT_Open_Face( library, args, -1, &face ); */
/* if ( error ) { ... } */
/* */
/* num_faces = face->num_faces; */
/* FT_Done_Face( face ); */
/* */
/* for ( i = 0; i < num_faces; i++ ) */
/* { */
/* ... */
/* error = FT_Open_Face( library, args, i, &face ); */
/* ... */
/* FT_Done_Face( face ); */
/* ... */
/* } */
/* } */
/* */
/* To loop over all valid values for `face_index', use something */
/* similar to the following snippet, again without error handling. */
/* The code accesses all faces immediately (thus only a single call */
/* of `FT_Open_Face' within the do-loop), with and without named */
/* instances. */
/* */
/* { */
/* ... */
/* FT_Face face; */
/* */
/* FT_Long num_faces = 0; */
/* FT_Long num_instances = 0; */
/* */
/* FT_Long face_idx = 0; */
/* FT_Long instance_idx = 0; */
/* */
/* */
/* do */
/* { */
/* FT_Long id = ( instance_idx << 16 ) + face_idx; */
/* */
/* */
/* error = FT_Open_Face( library, args, id, &face ); */
/* if ( error ) { ... } */
/* */
/* num_faces = face->num_faces; */
/* num_instances = face->style_flags >> 16; */
/* */
/* ... */
/* */
/* FT_Done_Face( face ); */
/* */
/* if ( instance_idx < num_instances ) */
/* instance_idx++; */
/* else */
/* { */
/* face_idx++; */
/* instance_idx = 0; */
/* } */
/* */
/* } while ( face_idx < num_faces ) */
/* } */
/* */
FT_EXPORT( FT_Error )
FT_Open_Face( FT_Library library,
const FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* Call @FT_Attach_Stream to attach a file. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* filepathname :: The pathname. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
FT_EXPORT( FT_Error )
FT_Attach_File( FT_Face face,
const char* filepathname );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* `Attach' data to a face object. Normally, this is used to read */
/* additional information for the face object. For example, you can */
/* attach an AFM file that comes with a Type~1 font to get the */
/* kerning values and other metrics. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* parameters :: A pointer to @FT_Open_Args that must be filled by */
/* the caller. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* The meaning of the `attach' (i.e., what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file or stream attachments. */
/* */
FT_EXPORT( FT_Error )
FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Reference_Face */
/* */
/* <Description> */
/* A counter gets initialized to~1 at the time an @FT_Face structure */
/* is created. This function increments the counter. @FT_Done_Face */
/* then only destroys a face if the counter is~1, otherwise it simply */
/* decrements the counter. */
/* */
/* This function helps in managing life-cycles of structures that */
/* reference @FT_Face objects. */
/* */
/* <Input> */
/* face :: A handle to a target face object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Since> */
/* 2.4.2 */
/* */
FT_EXPORT( FT_Error )
FT_Reference_Face( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Face */
/* */
/* <Description> */
/* Discard a given face object, as well as all of its child slots and */
/* sizes. */
/* */
/* <Input> */
/* face :: A handle to a target face object. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* See the discussion of reference counters in the description of */
/* @FT_Reference_Face. */
/* */
FT_EXPORT( FT_Error )
FT_Done_Face( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Size */
/* */
/* <Description> */
/* Select a bitmap strike. To be more precise, this function sets */
/* the scaling factors of the active @FT_Size object in a face so */
/* that bitmaps from this particular strike are taken by */
/* @FT_Load_Glyph and friends. */
/* */
/* <InOut> */
/* face :: A handle to a target face object. */
/* */
/* <Input> */
/* strike_index :: The index of the bitmap strike in the */
/* `available_sizes' field of @FT_FaceRec structure. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* For bitmaps embedded in outline fonts it is common that only a */
/* subset of the available glyphs at a given ppem value is available. */
/* FreeType silently uses outlines if there is no bitmap for a given */
/* glyph index. */
/* */
/* For GX and OpenType variation fonts, a bitmap strike makes sense */
/* only if the default instance is active (this is, no glyph */
/* variation takes place); otherwise, FreeType simply ignores bitmap */
/* strikes. The same is true for all named instances that are */
/* different from the default instance. */
/* */
/* Don't use this function if you are using the FreeType cache API. */
/* */
FT_EXPORT( FT_Error )
FT_Select_Size( FT_Face face,
FT_Int strike_index );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Size_Request_Type */
/* */
/* <Description> */
/* An enumeration type that lists the supported size request types, */
/* i.e., what input size (in font units) maps to the requested output */
/* size (in pixels, as computed from the arguments of */
/* @FT_Size_Request). */
/* */
/* <Values> */
/* FT_SIZE_REQUEST_TYPE_NOMINAL :: */
/* The nominal size. The `units_per_EM' field of @FT_FaceRec is */
/* used to determine both scaling values. */
/* */
/* This is the standard scaling found in most applications. In */
/* particular, use this size request type for TrueType fonts if */
/* they provide optical scaling or something similar. Note, */
/* however, that `units_per_EM' is a rather abstract value which */
/* bears no relation to the actual size of the glyphs in a font. */
/* */
/* FT_SIZE_REQUEST_TYPE_REAL_DIM :: */
/* The real dimension. The sum of the `ascender' and (minus of) */
/* the `descender' fields of @FT_FaceRec is used to determine both */
/* scaling values. */
/* */
/* FT_SIZE_REQUEST_TYPE_BBOX :: */
/* The font bounding box. The width and height of the `bbox' field */
/* of @FT_FaceRec are used to determine the horizontal and vertical */
/* scaling value, respectively. */
/* */
/* FT_SIZE_REQUEST_TYPE_CELL :: */
/* The `max_advance_width' field of @FT_FaceRec is used to */
/* determine the horizontal scaling value; the vertical scaling */
/* value is determined the same way as */
/* @FT_SIZE_REQUEST_TYPE_REAL_DIM does. Finally, both scaling */
/* values are set to the smaller one. This type is useful if you */
/* want to specify the font size for, say, a window of a given */
/* dimension and 80x24 cells. */
/* */
/* FT_SIZE_REQUEST_TYPE_SCALES :: */
/* Specify the scaling values directly. */
/* */
/* <Note> */
/* The above descriptions only apply to scalable formats. For bitmap */
/* formats, the behaviour is up to the driver. */
/* */
/* See the note section of @FT_Size_Metrics if you wonder how size */
/* requesting relates to scaling values. */
/* */
typedef enum FT_Size_Request_Type_
{
FT_SIZE_REQUEST_TYPE_NOMINAL,
FT_SIZE_REQUEST_TYPE_REAL_DIM,
FT_SIZE_REQUEST_TYPE_BBOX,
FT_SIZE_REQUEST_TYPE_CELL,
FT_SIZE_REQUEST_TYPE_SCALES,
FT_SIZE_REQUEST_TYPE_MAX
} FT_Size_Request_Type;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Size_RequestRec */
/* */
/* <Description> */
/* A structure to model a size request. */
/* */
/* <Fields> */
/* type :: See @FT_Size_Request_Type. */
/* */
/* width :: The desired width, given as a 26.6 fractional */
/* point value (with 72pt = 1in). */
/* */
/* height :: The desired height, given as a 26.6 fractional */
/* point value (with 72pt = 1in). */
/* */
/* horiResolution :: The horizontal resolution (dpi, i.e., pixels per */
/* inch). If set to zero, `width' is treated as a */
/* 26.6 fractional *pixel* value, which gets */
/* internally rounded to an integer. */
/* */
/* vertResolution :: The vertical resolution (dpi, i.e., pixels per */
/* inch). If set to zero, `height' is treated as a */
/* 26.6 fractional *pixel* value, which gets */
/* internally rounded to an integer. */
/* */
/* <Note> */
/* If `width' is zero, the horizontal scaling value is set equal */
/* to the vertical scaling value, and vice versa. */
/* */
/* If `type' is FT_SIZE_REQUEST_TYPE_SCALES, `width' and `height' are */
/* interpreted directly as 16.16 fractional scaling values, without */
/* any further modification, and both `horiResolution' and */
/* `vertResolution' are ignored. */
/* */
typedef struct FT_Size_RequestRec_
{
FT_Size_Request_Type type;
FT_Long width;
FT_Long height;
FT_UInt horiResolution;
FT_UInt vertResolution;
} FT_Size_RequestRec;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Size_Request */
/* */
/* <Description> */
/* A handle to a size request structure. */
/* */
typedef struct FT_Size_RequestRec_ *FT_Size_Request;
/*************************************************************************/
/* */
/* <Function> */
/* FT_Request_Size */
/* */
/* <Description> */
/* Resize the scale of the active @FT_Size object in a face. */
/* */
/* <InOut> */
/* face :: A handle to a target face object. */
/* */
/* <Input> */
/* req :: A pointer to a @FT_Size_RequestRec. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* Although drivers may select the bitmap strike matching the */
/* request, you should not rely on this if you intend to select a */
/* particular bitmap strike. Use @FT_Select_Size instead in that */
/* case. */
/* */
/* The relation between the requested size and the resulting glyph */
/* size is dependent entirely on how the size is defined in the */
/* source face. The font designer chooses the final size of each */
/* glyph relative to this size. For more information refer to */
/* `https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html'. */
/* */
/* Contrary to @FT_Set_Char_Size, this function doesn't have special */
/* code to normalize zero-valued widths, heights, or resolutions */
/* (which lead to errors in most cases). */
/* */
/* Don't use this function if you are using the FreeType cache API. */
/* */
FT_EXPORT( FT_Error )
FT_Request_Size( FT_Face face,
FT_Size_Request req );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Call @FT_Request_Size to request the nominal size (in points). */
/* */
/* <InOut> */
/* face :: A handle to a target face object. */
/* */
/* <Input> */
/* char_width :: The nominal width, in 26.6 fractional points. */
/* */
/* char_height :: The nominal height, in 26.6 fractional points. */
/* */
/* horz_resolution :: The horizontal resolution in dpi. */
/* */
/* vert_resolution :: The vertical resolution in dpi. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* While this function allows fractional points as input values, the */
/* resulting ppem value for the given resolution is always rounded to */
/* the nearest integer. */
/* */
/* If either the character width or height is zero, it is set equal */
/* to the other value. */
/* */
/* If either the horizontal or vertical resolution is zero, it is set */
/* equal to the other value. */
/* */
/* A character width or height smaller than 1pt is set to 1pt; if */
/* both resolution values are zero, they are set to 72dpi. */
/* */
/* Don't use this function if you are using the FreeType cache API. */
/* */
FT_EXPORT( FT_Error )
FT_Set_Char_Size( FT_Face face,
FT_F26Dot6 char_width,
FT_F26Dot6 char_height,
FT_UInt horz_resolution,
FT_UInt vert_resolution );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Pixel_Sizes */
/* */
/* <Description> */
/* Call @FT_Request_Size to request the nominal size (in pixels). */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* pixel_width :: The nominal width, in pixels. */
/* */
/* pixel_height :: The nominal height, in pixels. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* You should not rely on the resulting glyphs matching or being */
/* constrained to this pixel size. Refer to @FT_Request_Size to */
/* understand how requested sizes relate to actual sizes. */
/* */
/* Don't use this function if you are using the FreeType cache API. */
/* */
FT_EXPORT( FT_Error )
FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Glyph */
/* */
/* <Description> */
/* Load a glyph into the glyph slot of a face object. */
/* */
/* <InOut> */
/* face :: A handle to the target face object where the glyph */
/* is loaded. */
/* */
/* <Input> */
/* glyph_index :: The index of the glyph in the font file. For */
/* CID-keyed fonts (either in PS or in CFF format) */
/* this argument specifies the CID value. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* @FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* The loaded glyph may be transformed. See @FT_Set_Transform for */
/* the details. */
/* */
/* For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument' is */
/* returned for invalid CID values (this is, for CID values that */
/* don't have a corresponding glyph in the font). See the discussion */
/* of the @FT_FACE_FLAG_CID_KEYED flag for more details. */
/* */
/* If you receive `FT_Err_Glyph_Too_Big', try getting the glyph */
/* outline at EM size, then scale it manually and fill it as a */
/* graphics operation. */
/* */
FT_EXPORT( FT_Error )
FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int32 load_flags );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Char */
/* */
/* <Description> */
/* Load a glyph into the glyph slot of a face object, accessed by its */
/* character code. */
/* */
/* <InOut> */
/* face :: A handle to a target face object where the glyph */
/* is loaded. */
/* */
/* <Input> */
/* char_code :: The glyph's character code, according to the */
/* current charmap used in the face. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* @FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* This function simply calls @FT_Get_Char_Index and @FT_Load_Glyph. */
/* */
/* Many fonts contain glyphs that can't be loaded by this function */
/* since its glyph indices are not listed in any of the font's */
/* charmaps. */
/* */
/* If no active cmap is set up (i.e., `face->charmap' is zero), the */
/* call to @FT_Get_Char_Index is omitted, and the function behaves */
/* identically to @FT_Load_Glyph. */
/* */
FT_EXPORT( FT_Error )
FT_Load_Char( FT_Face face,
FT_ULong char_code,
FT_Int32 load_flags );
/*************************************************************************
*
* @enum:
* FT_LOAD_XXX
*
* @description:
* A list of bit field constants for @FT_Load_Glyph to indicate what
* kind of operations to perform during glyph loading.
*
* @values:
* FT_LOAD_DEFAULT ::
* Corresponding to~0, this value is used as the default glyph load
* operation. In this case, the following happens:
*
* 1. FreeType looks for a bitmap for the glyph corresponding to the
* face's current size. If one is found, the function returns.
* The bitmap data can be accessed from the glyph slot (see note
* below).
*
* 2. If no embedded bitmap is searched for or found, FreeType looks
* for a scalable outline. If one is found, it is loaded from
* the font file, scaled to device pixels, then `hinted' to the
* pixel grid in order to optimize it. The outline data can be
* accessed from the glyph slot (see note below).
*
* Note that by default the glyph loader doesn't render outlines into
* bitmaps. The following flags are used to modify this default
* behaviour to more specific and useful cases.
*
* FT_LOAD_NO_SCALE ::
* Don't scale the loaded outline glyph but keep it in font units.
*
* This flag implies @FT_LOAD_NO_HINTING and @FT_LOAD_NO_BITMAP, and
* unsets @FT_LOAD_RENDER.
*
* If the font is `tricky' (see @FT_FACE_FLAG_TRICKY for more), using
* FT_LOAD_NO_SCALE usually yields meaningless outlines because the
* subglyphs must be scaled and positioned with hinting instructions.
* This can be solved by loading the font without FT_LOAD_NO_SCALE and
* setting the character size to `font->units_per_EM'.
*
* FT_LOAD_NO_HINTING ::
* Disable hinting. This generally generates `blurrier' bitmap glyphs
* when the glyph are rendered in any of the anti-aliased modes. See
* also the note below.
*
* This flag is implied by @FT_LOAD_NO_SCALE.
*
* FT_LOAD_RENDER ::
* Call @FT_Render_Glyph after the glyph is loaded. By default, the
* glyph is rendered in @FT_RENDER_MODE_NORMAL mode. This can be
* overridden by @FT_LOAD_TARGET_XXX or @FT_LOAD_MONOCHROME.
*
* This flag is unset by @FT_LOAD_NO_SCALE.
*
* FT_LOAD_NO_BITMAP ::
* Ignore bitmap strikes when loading. Bitmap-only fonts ignore this
* flag.
*
* @FT_LOAD_NO_SCALE always sets this flag.
*
* FT_LOAD_VERTICAL_LAYOUT ::
* Load the glyph for vertical text layout. In particular, the
* `advance' value in the @FT_GlyphSlotRec structure is set to the
* `vertAdvance' value of the `metrics' field.
*
* In case @FT_HAS_VERTICAL doesn't return true, you shouldn't use
* this flag currently. Reason is that in this case vertical metrics
* get synthesized, and those values are not always consistent across
* various font formats.
*
* FT_LOAD_FORCE_AUTOHINT ::
* Prefer the auto-hinter over the font's native hinter. See also
* the note below.
*
* FT_LOAD_PEDANTIC ::
* Make the font driver perform pedantic verifications during glyph
* loading. This is mostly used to detect broken glyphs in fonts.
* By default, FreeType tries to handle broken fonts also.
*
* In particular, errors from the TrueType bytecode engine are not
* passed to the application if this flag is not set; this might
* result in partially hinted or distorted glyphs in case a glyph's
* bytecode is buggy.
*
* FT_LOAD_NO_RECURSE ::
* Don't load composite glyphs recursively. Instead, the font
* driver should set the `num_subglyph' and `subglyphs' values of
* the glyph slot accordingly, and set `glyph->format' to
* @FT_GLYPH_FORMAT_COMPOSITE. The description of subglyphs can
* then be accessed with @FT_Get_SubGlyph_Info.
*
* This flag implies @FT_LOAD_NO_SCALE and @FT_LOAD_IGNORE_TRANSFORM.
*
* FT_LOAD_IGNORE_TRANSFORM ::
* Ignore the transform matrix set by @FT_Set_Transform.
*
* FT_LOAD_MONOCHROME ::
* This flag is used with @FT_LOAD_RENDER to indicate that you want to
* render an outline glyph to a 1-bit monochrome bitmap glyph, with
* 8~pixels packed into each byte of the bitmap data.
*
* Note that this has no effect on the hinting algorithm used. You
* should rather use @FT_LOAD_TARGET_MONO so that the
* monochrome-optimized hinting algorithm is used.
*
* FT_LOAD_LINEAR_DESIGN ::
* Keep `linearHoriAdvance' and `linearVertAdvance' fields of
* @FT_GlyphSlotRec in font units. See @FT_GlyphSlotRec for
* details.
*
* FT_LOAD_NO_AUTOHINT ::
* Disable the auto-hinter. See also the note below.
*
* FT_LOAD_COLOR ::
* [Since 2.5] Load embedded color bitmap images. The resulting color
* bitmaps, if available, will have the @FT_PIXEL_MODE_BGRA format.
* If the flag is not set and color bitmaps are found, they are
* converted to 256-level gray bitmaps transparently, using the
* @FT_PIXEL_MODE_GRAY format.
*
* FT_LOAD_COMPUTE_METRICS ::
* [Since 2.6.1] Compute glyph metrics from the glyph data, without
* the use of bundled metrics tables (for example, the `hdmx' table in
* TrueType fonts). This flag is mainly used by font validating or
* font editing applications, which need to ignore, verify, or edit
* those tables.
*
* Currently, this flag is only implemented for TrueType fonts.
*
* FT_LOAD_BITMAP_METRICS_ONLY ::
* [Since 2.7.1] Request loading of the metrics and bitmap image
* information of a (possibly embedded) bitmap glyph without
* allocating or copying the bitmap image data itself. No effect if
* the target glyph is not a bitmap image.
*
* This flag unsets @FT_LOAD_RENDER.
*
* FT_LOAD_CROP_BITMAP ::
* Ignored. Deprecated.
*
* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ::
* Ignored. Deprecated.
*
* @note:
* By default, hinting is enabled and the font's native hinter (see
* @FT_FACE_FLAG_HINTER) is preferred over the auto-hinter. You can
* disable hinting by setting @FT_LOAD_NO_HINTING or change the
* precedence by setting @FT_LOAD_FORCE_AUTOHINT. You can also set
* @FT_LOAD_NO_AUTOHINT in case you don't want the auto-hinter to be
* used at all.
*
* See the description of @FT_FACE_FLAG_TRICKY for a special exception
* (affecting only a handful of Asian fonts).
*
* Besides deciding which hinter to use, you can also decide which
* hinting algorithm to use. See @FT_LOAD_TARGET_XXX for details.
*
* Note that the auto-hinter needs a valid Unicode cmap (either a native
* one or synthesized by FreeType) for producing correct results. If a
* font provides an incorrect mapping (for example, assigning the
* character code U+005A, LATIN CAPITAL LETTER Z, to a glyph depicting a
* mathematical integral sign), the auto-hinter might produce useless
* results.
*
*/
#define FT_LOAD_DEFAULT 0x0
#define FT_LOAD_NO_SCALE ( 1L << 0 )
#define FT_LOAD_NO_HINTING ( 1L << 1 )
#define FT_LOAD_RENDER ( 1L << 2 )
#define FT_LOAD_NO_BITMAP ( 1L << 3 )
#define FT_LOAD_VERTICAL_LAYOUT ( 1L << 4 )
#define FT_LOAD_FORCE_AUTOHINT ( 1L << 5 )
#define FT_LOAD_CROP_BITMAP ( 1L << 6 )
#define FT_LOAD_PEDANTIC ( 1L << 7 )
#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ( 1L << 9 )
#define FT_LOAD_NO_RECURSE ( 1L << 10 )
#define FT_LOAD_IGNORE_TRANSFORM ( 1L << 11 )
#define FT_LOAD_MONOCHROME ( 1L << 12 )
#define FT_LOAD_LINEAR_DESIGN ( 1L << 13 )
#define FT_LOAD_NO_AUTOHINT ( 1L << 15 )
/* Bits 16-19 are used by `FT_LOAD_TARGET_' */
#define FT_LOAD_COLOR ( 1L << 20 )
#define FT_LOAD_COMPUTE_METRICS ( 1L << 21 )
#define FT_LOAD_BITMAP_METRICS_ONLY ( 1L << 22 )
/* */
/* used internally only by certain font drivers */
#define FT_LOAD_ADVANCE_ONLY ( 1L << 8 )
#define FT_LOAD_SBITS_ONLY ( 1L << 14 )
/**************************************************************************
*
* @enum:
* FT_LOAD_TARGET_XXX
*
* @description:
* A list of values to select a specific hinting algorithm for the
* hinter. You should OR one of these values to your `load_flags'
* when calling @FT_Load_Glyph.
*
* Note that a font's native hinters may ignore the hinting algorithm
* you have specified (e.g., the TrueType bytecode interpreter). You
* can set @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is
* used.
*
* @values:
* FT_LOAD_TARGET_NORMAL ::
* The default hinting algorithm, optimized for standard gray-level
* rendering. For monochrome output, use @FT_LOAD_TARGET_MONO
* instead.
*
* FT_LOAD_TARGET_LIGHT ::
* A lighter hinting algorithm for gray-level modes. Many generated
* glyphs are fuzzier but better resemble their original shape. This
* is achieved by snapping glyphs to the pixel grid only vertically
* (Y-axis), as is done by FreeType's new CFF engine or Microsoft's
* ClearType font renderer. This preserves inter-glyph spacing in
* horizontal text. The snapping is done either by the native font
* driver, if the driver itself and the font support it, or by the
* auto-hinter.
*
* Advance widths are rounded to integer values; however, using the
* `lsb_delta' and `rsb_delta' fields of @FT_GlyphSlotRec, it is
* possible to get fractional advance widths for subpixel positioning
* (which is recommended to use).
*
* If configuration option AF_CONFIG_OPTION_TT_SIZE_METRICS is active,
* TrueType-like metrics are used to make this mode behave similarly
* as in unpatched FreeType versions between 2.4.6 and 2.7.1
* (inclusive).
*
* FT_LOAD_TARGET_MONO ::
* Strong hinting algorithm that should only be used for monochrome
* output. The result is probably unpleasant if the glyph is rendered
* in non-monochrome modes.
*
* FT_LOAD_TARGET_LCD ::
* A variant of @FT_LOAD_TARGET_LIGHT optimized for horizontally
* decimated LCD displays.
*
* FT_LOAD_TARGET_LCD_V ::
* A variant of @FT_LOAD_TARGET_NORMAL optimized for vertically
* decimated LCD displays.
*
* @note:
* You should use only _one_ of the FT_LOAD_TARGET_XXX values in your
* `load_flags'. They can't be ORed.
*
* If @FT_LOAD_RENDER is also set, the glyph is rendered in the
* corresponding mode (i.e., the mode that matches the used algorithm
* best). An exception is FT_LOAD_TARGET_MONO since it implies
* @FT_LOAD_MONOCHROME.
*
* You can use a hinting algorithm that doesn't correspond to the same
* rendering mode. As an example, it is possible to use the `light'
* hinting algorithm and have the results rendered in horizontal LCD
* pixel mode, with code like
*
* {
* FT_Load_Glyph( face, glyph_index,
* load_flags | FT_LOAD_TARGET_LIGHT );
*
* FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD );
* }
*
* In general, you should stick with one rendering mode. For example,
* switching between @FT_LOAD_TARGET_NORMAL and @FT_LOAD_TARGET_MONO
* enforces a lot of recomputation for TrueType fonts, which is slow.
* Another reason is caching: Selecting a different mode usually causes
* changes in both the outlines and the rasterized bitmaps; it is thus
* necessary to empty the cache after a mode switch to avoid false hits.
*
*/
#define FT_LOAD_TARGET_( x ) ( (FT_Int32)( (x) & 15 ) << 16 )
#define FT_LOAD_TARGET_NORMAL FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL )
#define FT_LOAD_TARGET_LIGHT FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT )
#define FT_LOAD_TARGET_MONO FT_LOAD_TARGET_( FT_RENDER_MODE_MONO )
#define FT_LOAD_TARGET_LCD FT_LOAD_TARGET_( FT_RENDER_MODE_LCD )
#define FT_LOAD_TARGET_LCD_V FT_LOAD_TARGET_( FT_RENDER_MODE_LCD_V )
/**************************************************************************
*
* @macro:
* FT_LOAD_TARGET_MODE
*
* @description:
* Return the @FT_Render_Mode corresponding to a given
* @FT_LOAD_TARGET_XXX value.
*
*/
#define FT_LOAD_TARGET_MODE( x ) ( (FT_Render_Mode)( ( (x) >> 16 ) & 15 ) )
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Transform */
/* */
/* <Description> */
/* Set the transformation that is applied to glyph images when they */
/* are loaded into a glyph slot through @FT_Load_Glyph. */
/* */
/* <InOut> */
/* face :: A handle to the source face object. */
/* */
/* <Input> */
/* matrix :: A pointer to the transformation's 2x2 matrix. Use NULL */
/* for the identity matrix. */
/* delta :: A pointer to the translation vector. Use NULL for the */
/* null vector. */
/* */
/* <Note> */
/* The transformation is only applied to scalable image formats after */
/* the glyph has been loaded. It means that hinting is unaltered by */
/* the transformation and is performed on the character size given in */
/* the last call to @FT_Set_Char_Size or @FT_Set_Pixel_Sizes. */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT( void )
FT_Set_Transform( FT_Face face,
FT_Matrix* matrix,
FT_Vector* delta );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Render_Mode */
/* */
/* <Description> */
/* Render modes supported by FreeType~2. Each mode corresponds to a */
/* specific type of scanline conversion performed on the outline. */
/* */
/* For bitmap fonts and embedded bitmaps the `bitmap->pixel_mode' */
/* field in the @FT_GlyphSlotRec structure gives the format of the */
/* returned bitmap. */
/* */
/* All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity, */
/* indicating pixel coverage. Use linear alpha blending and gamma */
/* correction to correctly render non-monochrome glyph bitmaps onto a */
/* surface; see @FT_Render_Glyph. */
/* */
/* <Values> */
/* FT_RENDER_MODE_NORMAL :: */
/* Default render mode; it corresponds to 8-bit anti-aliased */
/* bitmaps. */
/* */
/* FT_RENDER_MODE_LIGHT :: */
/* This is equivalent to @FT_RENDER_MODE_NORMAL. It is only */
/* defined as a separate value because render modes are also used */
/* indirectly to define hinting algorithm selectors. See */
/* @FT_LOAD_TARGET_XXX for details. */
/* */
/* FT_RENDER_MODE_MONO :: */
/* This mode corresponds to 1-bit bitmaps (with 2~levels of */
/* opacity). */
/* */
/* FT_RENDER_MODE_LCD :: */
/* This mode corresponds to horizontal RGB and BGR subpixel */
/* displays like LCD screens. It produces 8-bit bitmaps that are */
/* 3~times the width of the original glyph outline in pixels, and */
/* which use the @FT_PIXEL_MODE_LCD mode. */
/* */
/* FT_RENDER_MODE_LCD_V :: */
/* This mode corresponds to vertical RGB and BGR subpixel 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> */
/* Should you define FT_CONFIG_OPTION_SUBPIXEL_RENDERING in your */
/* `ftoption.h', which enables patented ClearType-style rendering, */
/* the LCD-optimized glyph bitmaps should be filtered to reduce color */
/* fringes inherent to this technology. You can either set up LCD */
/* filtering with @FT_Library_SetLcdFilter or @FT_Face_Properties, */
/* or do the filtering yourself. The default FreeType LCD rendering */
/* technology does not require filtering. */
/* */
/* The selected render mode only affects vector glyphs of a font. */
/* Embedded bitmaps often have a different pixel mode like */
/* @FT_PIXEL_MODE_MONO. You can use @FT_Bitmap_Convert to transform */
/* them into 8-bit pixmaps. */
/* */
typedef enum FT_Render_Mode_
{
FT_RENDER_MODE_NORMAL = 0,
FT_RENDER_MODE_LIGHT,
FT_RENDER_MODE_MONO,
FT_RENDER_MODE_LCD,
FT_RENDER_MODE_LCD_V,
FT_RENDER_MODE_MAX
} FT_Render_Mode;
/* these constants are deprecated; use the corresponding */
/* `FT_Render_Mode' values instead */
#define ft_render_mode_normal FT_RENDER_MODE_NORMAL
#define ft_render_mode_mono FT_RENDER_MODE_MONO
/*************************************************************************/
/* */
/* <Function> */
/* FT_Render_Glyph */
/* */
/* <Description> */
/* Convert a given glyph image to a bitmap. It does so by inspecting */
/* the glyph image format, finding the relevant renderer, and */
/* invoking it. */
/* */
/* <InOut> */
/* slot :: A handle to the glyph slot containing the image to */
/* convert. */
/* */
/* <Input> */
/* render_mode :: The render mode used to render the glyph image into */
/* a bitmap. See @FT_Render_Mode for a list of */
/* possible values. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* To get meaningful results, font scaling values must be set with */
/* functions like @FT_Set_Char_Size before calling `FT_Render_Glyph'. */
/* */
/* When FreeType outputs a bitmap of a glyph, it really outputs an */
/* alpha coverage map. If a pixel is completely covered by a */
/* filled-in outline, the bitmap contains 0xFF at that pixel, meaning */
/* that 0xFF/0xFF fraction of that pixel is covered, meaning the */
/* pixel is 100% black (or 0% bright). If a pixel is only 50% */
/* covered (value 0x80), the pixel is made 50% black (50% bright or a */
/* middle shade of grey). 0% covered means 0% black (100% bright or */
/* white). */
/* */
/* On high-DPI screens like on smartphones and tablets, the pixels */
/* are so small that their chance of being completely covered and */
/* therefore completely black are fairly good. On the low-DPI */
/* screens, however, the situation is different. The pixels are too */
/* large for most of the details of a glyph and shades of gray are */
/* the norm rather than the exception. */
/* */
/* This is relevant because all our screens have a second problem: */
/* they are not linear. 1~+~1 is not~2. Twice the value does not */
/* result in twice the brightness. When a pixel is only 50% covered, */
/* the coverage map says 50% black, and this translates to a pixel */
/* value of 128 when you use 8~bits per channel (0-255). However, */
/* this does not translate to 50% brightness for that pixel on our */
/* sRGB and gamma~2.2 screens. Due to their non-linearity, they */
/* dwell longer in the darks and only a pixel value of about 186 */
/* results in 50% brightness -- 128 ends up too dark on both bright */
/* and dark backgrounds. The net result is that dark text looks */
/* burnt-out, pixely and blotchy on bright background, bright text */
/* too frail on dark backgrounds, and colored text on colored */
/* background (for example, red on green) seems to have dark halos or */
/* `dirt' around it. The situation is especially ugly for diagonal */
/* stems like in `w' glyph shapes where the quality of FreeType's */
/* anti-aliasing depends on the correct display of grays. On */
/* high-DPI screens where smaller, fully black pixels reign supreme, */
/* this doesn't matter, but on our low-DPI screens with all the gray */
/* shades, it does. 0% and 100% brightness are the same things in */
/* linear and non-linear space, just all the shades in-between */
/* aren't. */
/* */
/* The blending function for placing text over a background is */
/* */
/* { */
/* dst = alpha * src + (1 - alpha) * dst , */
/* } */
/* */
/* which is known as the OVER operator. */
/* */
/* To correctly composite an antialiased pixel of a glyph onto a */
/* surface, */
/* */
/* 1. take the foreground and background colors (e.g., in sRGB space) */
/* and apply gamma to get them in a linear space, */
/* */
/* 2. use OVER to blend the two linear colors using the glyph pixel */
/* as the alpha value (remember, the glyph bitmap is an alpha */
/* coverage bitmap), and */
/* */
/* 3. apply inverse gamma to the blended pixel and write it back to */
/* the image. */
/* */
/* Internal testing at Adobe found that a target inverse gamma of~1.8 */
/* for step~3 gives good results across a wide range of displays with */
/* an sRGB gamma curve or a similar one. */
/* */
/* This process can cost performance. There is an approximation that */
/* does not need to know about the background color; see */
/* https://bel.fi/alankila/lcd/ and */
/* https://bel.fi/alankila/lcd/alpcor.html for details. */
/* */
/* *ATTENTION*: Linear blending is even more important when dealing */
/* with subpixel-rendered glyphs to prevent color-fringing! A */
/* subpixel-rendered glyph must first be filtered with a filter that */
/* gives equal weight to the three color primaries and does not */
/* exceed a sum of 0x100, see section @lcd_filtering. Then the */
/* only difference to gray linear blending is that subpixel-rendered */
/* linear blending is done 3~times per pixel: red foreground subpixel */
/* to red background subpixel and so on for green and blue. */
/* */
FT_EXPORT( FT_Error )
FT_Render_Glyph( FT_GlyphSlot slot,
FT_Render_Mode render_mode );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Kerning_Mode */
/* */
/* <Description> */
/* An enumeration to specify the format of kerning values returned by */
/* @FT_Get_Kerning. */
/* */
/* <Values> */
/* FT_KERNING_DEFAULT :: Return grid-fitted kerning distances in */
/* 26.6 fractional pixels. */
/* */
/* FT_KERNING_UNFITTED :: Return un-grid-fitted kerning distances in */
/* 26.6 fractional pixels. */
/* */
/* FT_KERNING_UNSCALED :: Return the kerning vector in original font */
/* units. */
/* */
/* <Note> */
/* FT_KERNING_DEFAULT returns full pixel values; it also makes */
/* FreeType heuristically scale down kerning distances at small ppem */
/* values so that they don't become too big. */
/* */
/* Both FT_KERNING_DEFAULT and FT_KERNING_UNFITTED use the current */
/* horizontal scaling factor (as set e.g. with @FT_Set_Char_Size) to */
/* convert font units to pixels. */
/* */
typedef enum FT_Kerning_Mode_
{
FT_KERNING_DEFAULT = 0,
FT_KERNING_UNFITTED,
FT_KERNING_UNSCALED
} FT_Kerning_Mode;
/* these constants are deprecated; use the corresponding */
/* `FT_Kerning_Mode' values instead */
#define ft_kerning_default FT_KERNING_DEFAULT
#define ft_kerning_unfitted FT_KERNING_UNFITTED
#define ft_kerning_unscaled FT_KERNING_UNSCALED
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Kerning */
/* */
/* <Description> */
/* Return the kerning vector between two glyphs of the same face. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* left_glyph :: The index of the left glyph in the kern pair. */
/* */
/* right_glyph :: The index of the right glyph in the kern pair. */
/* */
/* kern_mode :: See @FT_Kerning_Mode for more information. */
/* Determines the scale and dimension of the returned */
/* kerning vector. */
/* */
/* <Output> */
/* akerning :: The kerning vector. This is either in font units, */
/* fractional pixels (26.6 format), or pixels for */
/* scalable formats, and in pixels for fixed-sizes */
/* formats. */
/* */
/* <Return> */
/* FreeType error code. 0~means success. */
/* */
/* <Note> */
/* Only horizontal layouts (left-to-right & right-to-left) are */
/* supported by this method. Other layouts, or more sophisticated */
/* kernings, are out of the scope of this API function -- they can be */
/* implemented through format-specific interfaces. */
/*