rgraves
/
freetype2
forked from minhngoc25a/freetype2
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
freetype2/include/freetype/freetype.h

2299 lines
147 KiB
C
Raw Blame History

/***************************************************************************/
/* */
/* freetype.h */
/* */
/* FreeType high-level API and common types (specification only). */
/* */
/* Copyright 1996-2000 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
/*************************************************************************/
/* */
/* The `raster' component duplicates some of the declarations in */
/* freetype.h for stand-alone use if _FREETYPE_ isn't defined. */
/* */
#define _FREETYPE_
/*************************************************************************/
/* */
/* The FREETYPE_MAJOR and FREETYPE_MINOR macros are used to version the */
/* new FreeType design, which is able to host several kinds of font */
/* drivers. It starts at 2.0. */
/* */
#define FREETYPE_MAJOR 2
#define FREETYPE_MINOR 0
#include <freetype/config/ftconfig.h> /* read configuration information */
#include <freetype/fterrors.h>
#include <freetype/fttypes.h>
#ifdef __cplusplus
extern "C" {
#endif
/*************************************************************************/
/*************************************************************************/
/* */
/* B A S I C T Y P E S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Glyph_Metrics */
/* */
/* <Description> */
/* A structure used to model the metrics of a single glyph. Note */
/* that values are expressed in 26.6 fractional pixel format or in */
/* font units, depending on context. */
/* */
/* <Fields> */
/* width :: The glyph's width. */
/* */
/* height :: The glyph's height. */
/* */
/* horiBearingX :: Horizontal left side bearing. */
/* */
/* horiBearingY :: Horizontal top side bearing. */
/* */
/* horiAdvance :: Horizontal advance width. */
/* */
/* vertBearingX :: Vertical left side bearing. */
/* */
/* vertBearingY :: Vertical top side bearing. */
/* */
/* vertAdvance :: Vertical advance height. */
/* */
typedef struct FT_Glyph_Metrics_
{
FT_Pos width; /* glyph width */
FT_Pos height; /* glyph height */
FT_Pos horiBearingX; /* left side bearing in horizontal layouts */
FT_Pos horiBearingY; /* top side bearing in horizontal layouts */
FT_Pos horiAdvance; /* advance width for horizontal layout */
FT_Pos vertBearingX; /* left side bearing in vertical layouts */
FT_Pos vertBearingY; /* top side bearing in vertical layouts */
FT_Pos vertAdvance; /* advance height for vertical layout */
} FT_Glyph_Metrics;
/*************************************************************************/
/* */
/* <FuncType> */
/* FT_Generic_Finalizer */
/* */
/* <Description> */
/* Describes a function used to destroy the `client' data of any */
/* FreeType object. See the description of the FT_Generic type for */
/* details of usage. */
/* */
/* <Input> */
/* The address of the FreeType object which is under finalization. */
/* Its client data is accessed through its `generic' field. */
/* */
typedef void (*FT_Generic_Finalizer)(void* object);
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Generic */
/* */
/* <Description> */
/* Client applications often need to associate their own data to a */
/* variety of FreeType core objects. For example, a text layout API */
/* might want to associate a glyph cache to a given size object. */
/* */
/* Most FreeType object contains a `generic' field, of type */
/* FT_Generic, which usage is left to client applications and font */
/* servers. */
/* */
/* It can be used to store a pointer to client-specific data, as well */
/* as the address of a `finalizer' function, which will be called by */
/* FreeType when the object is destroyed (for example, the previous */
/* client example would put the address of the glyph cache destructor */
/* in the `finalizer' field). */
/* */
/* <Fields> */
/* data :: A typeless pointer to any client-specified data. This */
/* field is completely ignored by the FreeType library. */
/* */
/* finalizer :: A pointer to a `generic finalizer' function, which */
/* will be called when the object is destroyed. If this */
/* field is set to NULL, no code will be called. */
/* */
typedef struct FT_Generic_
{
void* data;
FT_Generic_Finalizer finalizer;
} FT_Generic;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Bitmap_Size */
/* */
/* <Description> */
/* An extremely simple structure used to model the size of a bitmap */
/* strike (i.e., a bitmap instance of the font for a given */
/* resolution) in a fixed-size font face. This is used for the */
/* `available_sizes' field of the FT_Face_Properties structure. */
/* */
/* <Fields> */
/* height :: The character height in pixels. */
/* */
/* width :: The character width in pixels. */
/* */
typedef struct FT_Bitmap_Size_
{
FT_Short height;
FT_Short width;
} 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 system object (see FT_System), as well as a */
/* scan-line converter object (see FT_Raster). */
/* */
/* <Note> */
/* Library objects are created through FT_Init_FreeType(). */
/* */
typedef struct FT_LibraryRec_ *FT_Library;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Module */
/* */
/* <Description> */
/* A handle to a given FreeType module object. Each module can be a */
/* font driver, a renderer, or anything else that provides services */
/* to the formers. */
/* */
typedef struct FT_ModuleRec_* FT_Module;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Driver */
/* */
/* <Description> */
/* A handle to a given FreeType font driver object. Each font driver */
/* is able to create faces, sizes, glyph slots, and charmaps from the */
/* resources whose format it supports. */
/* */
/* A driver can support either bitmap, graymap, or scalable font */
/* formats. */
/* */
typedef struct FT_DriverRec_* FT_Driver;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Renderer */
/* */
/* <Description> */
/* A handle to a given FreeType renderer. A renderer is in charge of */
/* converting a glyph image to a bitmap, when necessary. Each */
/* supports a given glyph image format, and one or more target */
/* surface depths. */
/* */
typedef struct FT_RendererRec_* FT_Renderer;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Face */
/* */
/* <Description> */
/* A handle to a given driver face object. A face object contains */
/* all the instance and glyph independent data of a font file */
/* typeface. */
/* */
/* A face object is created from a resource object through the */
/* new_face() method of a given driver. */
/* */
typedef struct FT_FaceRec_* FT_Face;
/*************************************************************************/
/* */
/* <Type> */
/* FT_Size */
/* */
/* <Description> */
/* A handle to a given driver size object. Such an object models the */
/* _resolution_ AND _size_ dependent state of a given driver face */
/* size. */
/* */
/* A size object is always created from a given face object. It is */
/* discarded automatically by its parent face. */
/* */
typedef struct FT_SizeRec_* FT_Size;
/*************************************************************************/
/* */
/* <Type> */
/* FT_GlyphSlot */
/* */
/* <Description> */
/* A handle to a given `glyph slot'. A slot is a container where it */
/* is possible to load any of the glyphs contained within its parent */
/* face. */
/* */
/* A glyph slot is created from a given face object. It is discarded */
/* automatically by its parent face. */
/* */
typedef struct FT_GlyphSlotRec_* FT_GlyphSlot;
/*************************************************************************/
/* */
/* <Type> */
/* FT_CharMap */
/* */
/* <Description> */
/* A handle to a given character map. A charmap is used to translate */
/* character codes in a given encoding into glyph indexes for its */
/* parent's face. Some font formats may provide several charmaps per */
/* font. */
/* */
/* A charmap is created from a given face object. It is discarded */
/* automatically by its parent face. */
/* */
typedef struct FT_CharMapRec_* FT_CharMap;
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Encoding */
/* */
/* <Description> */
/* An enumeration used to specify encodings supported by charmaps. */
/* Used in the FT_Select_Charmap() API function. */
/* */
/* <Note> */
/* Because of 32-bit charcodes defined in Unicode (i.e., surrogates), */
/* all character codes must be expressed as FT_Longs. */
/* */
/* Other encodings might be defined in the future. */
/* */
typedef enum FT_Encoding_
{
ft_encoding_none = 0,
ft_encoding_symbol = FT_MAKE_TAG( 's', 'y', 'm', 'b' ),
ft_encoding_unicode = FT_MAKE_TAG( 'u', 'n', 'i', 'c' ),
ft_encoding_latin_2 = FT_MAKE_TAG( 'l', 'a', 't', '2' ),
ft_encoding_sjis = FT_MAKE_TAG( 's', 'j', 'i', 's' ),
ft_encoding_gb2312 = FT_MAKE_TAG( 'g', 'b', ' ', ' ' ),
ft_encoding_big5 = FT_MAKE_TAG( 'b', 'i', 'g', '5' ),
ft_encoding_wansung = FT_MAKE_TAG( 'w', 'a', 'n', 's' ),
ft_encoding_johab = FT_MAKE_TAG( 'j', 'o', 'h', 'a' ),
ft_encoding_adobe_standard = FT_MAKE_TAG( 'A', 'D', 'O', 'B' ),
ft_encoding_adobe_expert = FT_MAKE_TAG( 'A', 'D', 'B', 'E' ),
ft_encoding_adobe_custom = FT_MAKE_TAG( 'A', 'D', 'B', 'C' ),
ft_encoding_apple_roman = FT_MAKE_TAG( 'a', 'r', 'm', 'n' )
} FT_Encoding;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_CharMapRec */
/* */
/* <Description> */
/* The base charmap class. */
/* */
/* <Fields> */
/* face :: A handle to the parent face object. */
/* */
/* encoding :: A tag which identifies the charmap. Use this with */
/* FT_Select_Charmap(). */
/* */
/* platform_id :: An ID number describing the platform for the */
/* following encoding ID. This comes directly from */
/* the TrueType specification and should be emulated */
/* for other formats. */
/* */
/* encoding_id :: A platform specific encoding number. This also */
/* comes from the TrueType specification and should be */
/* emulated similarly. */
/* */
/* <Note> */
/* We STRONGLY recommmend emulating a Unicode charmap for drivers */
/* that do not support TrueType or OpenType. */
/* */
typedef struct FT_CharMapRec_
{
FT_Face face;
FT_Encoding encoding;
FT_UShort platform_id;
FT_UShort encoding_id;
} FT_CharMapRec;
/*************************************************************************/
/*************************************************************************/
/* */
/* B A S E O B J E C T C L A S S E S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Type> */
/* FT_Face_Internal */
/* */
/* <Description> */
/* An opaque handle to an FT_Face_InternalRec structure, used to */
/* model private data of a given FT_Face object. */
/* */
/* This field might change between releases of FreeType 2 and are */
/* not generally available to client applications. */
/* */
typedef struct FT_Face_InternalRec_* FT_Face_Internal;
/*************************************************************************/
/* */
/* FreeType base face class */
/* */
/* <Struct> */
/* FT_FaceRec */
/* */
/* <Description> */
/* FreeType root face class structure. A face object models the */
/* resolution and point-size independent data found in a font file. */
/* */
/* <Fields> */
/* num_faces :: In the case where the face is located in a */
/* collection (i.e., a resource which embeds */
/* several faces), this is the total number of */
/* faces found in the resource. 1 by default. */
/* */
/* face_index :: The index of the face in its resource. */
/* Usually, this is 0 for all normal font */
/* formats. It can be more in the case of */
/* collections (which embed several fonts in a */
/* single resource/file). */
/* */
/* face_flags :: A set of bit flags that give important */
/* information about the face; see the */
/* FT_FACE_FLAG_XXX macros for details. */
/* */
/* style_flags :: A set of bit flags indicating the style of */
/* the face (i.e., italic, bold, underline, */
/* etc). */
/* */
/* num_glyphs :: The total number of glyphs in the face. */
/* */
/* family_name :: The face's family name. This is an ASCII */
/* string, usually in English, which describes */
/* the typeface's family (like `Times New */
/* Roman', `Bodoni', `Garamond', etc). This */
/* is a least common denominator used to list */
/* fonts. Some formats (TrueType & OpenType) */
/* provide localized and Unicode versions of */
/* this string. Applications should use the */
/* format specific interface to access them. */
/* */
/* style_name :: The face's style name. This is an ASCII */
/* string, usually in English, which describes */
/* the typeface's style (like `Italic', */
/* `Bold', `Condensed', etc). Not all font */
/* formats provide a style name, so this field */
/* is optional, and can be set to NULL. As */
/* for `family_name', some formats provide */
/* localized/Unicode versions of this string. */
/* Applications should use the format specific */
/* interface to access them. */
/* */
/* num_fixed_sizes :: The number of fixed sizes available in this */
/* face. This should be set to 0 for scalable */
/* fonts, unless its resource includes a */
/* complete set of glyphs (called a `strike') */
/* for the specified size. */
/* */
/* available_sizes :: An array of sizes specifying the available */
/* bitmap/graymap sizes that are contained in */
/* in the font resource. Should be set to */
/* NULL if the field `num_fixed_sizes' is set */
/* to 0. */
/* */
/* num_charmaps :: The total number of character maps in the */
/* face. */
/* */
/* charmaps :: A table of pointers to the face's charmaps */
/* Used to scan the list of available charmaps */
/* this table might change after a call to */
/* FT_Attach_File/Stream (e.g. when it used */
/* to hook and additional encoding/CMap to */
/* the face object). */
/* */
/* generic :: A field reserved for client uses. See the */
/* FT_Generic type description. */
/* */
/* bbox :: The font bounding box. Coordinates are */
/* expressed in font units (see units_per_EM). */
/* The box is large enough to contain any */
/* glyph from the font. Thus, bbox.yMax can */
/* be seen as the `maximal ascender', */
/* bbox.yMin as the `minimal descender', and */
/* the maximal glyph width is given by */
/* `bbox.xMax-bbox.xMin' (not to be confused */
/* with the maximal _advance_width_). Only */
/* relevant for scalable formats. */
/* */
/* units_per_EM :: The number of font units per EM square for */
/* this face. This is typically 2048 for */
/* TrueType fonts, 1000 for Type1 fonts, and */
/* should be set to the (unrealistic) value 1 */
/* for fixed-sizes fonts. Only relevant for */
/* scalable formats. */
/* */
/* ascender :: The face's ascender is the vertical */
/* distance from the baseline to the topmost */
/* point of any glyph in the face. This */
/* field's value is positive, expressed in */
/* font units. Some font designs use a value */
/* different from `bbox.yMax'. Only relevant */
/* for scalable formats. */
/* */
/* descender :: The face's descender is the vertical */
/* distance from the baseline to the */
/* bottommost point of any glyph in the face. */
/* This field's value is positive, expressed */
/* in font units. Some font designs use a */
/* value different from `-bbox.yMin'. Only */
/* relevant for scalable formats. */
/* */
/* height :: The face's height is the vertical distance */
/* from one baseline to the next when writing */
/* several lines of text. Its value is always */
/* positive, expressed in font units. The */
/* value can be computed as */
/* `ascender+descender+line_gap' where the */
/* value of `line_gap' is also called */
/* `external leading'. Only relevant for */
/* scalable formats. */
/* */
/* max_advance_width :: The maximal advance width, in font units, */
/* for all glyphs in this face. This can be */
/* used to make word wrapping computations */
/* faster. Only relevant for scalable */
/* formats. */
/* */
/* max_advance_height :: The maximal advance height, in font units, */
/* for all glyphs in this face. This is only */
/* relevant for vertical layouts, and should */
/* be set to the `height' for fonts that do */
/* not provide vertical metrics. Only */
/* relevant for scalable formats. */
/* */
/* underline_position :: The position, in font units, of the */
/* underline line for this face. It's the */
/* center of the underlining stem. Only */
/* relevant for scalable formats. */
/* */
/* underline_thickness :: The thickness, in font units, of the */
/* underline for this face. Only relevant for */
/* scalable formats. */
/* */
/* driver :: A handle to the face's parent driver */
/* object. */
/* */
/* memory :: A handle to the face's parent memory */
/* object. Used for the allocation of */
/* subsequent objects. */
/* */
/* stream :: A handle to the face's stream. */
/* */
/* glyph :: The face's associated glyph slot(s). This */
/* object is created automatically with a new */
/* face object. However, certain kinds of */
/* applications (mainly tools like converters) */
/* can need more than one slot to ease their */
/* task. */
/* */
/* sizes_list :: The list of child sizes for this face. */
/* */
/* internal :: A pointer to internal fields of the face */
/* object. These fields can change freely */
/* between releases of FreeType and are not */
/* publicly available. */
/* */
typedef struct FT_FaceRec_
{
FT_Long num_faces;
FT_Long face_index;
FT_Long face_flags;
FT_Long style_flags;
FT_Long num_glyphs;
FT_String* family_name;
FT_String* style_name;
FT_Int num_fixed_sizes;
FT_Bitmap_Size* available_sizes;
FT_Int num_charmaps;
FT_CharMap* charmaps;
FT_Generic generic;
/*# the following are only relevant to scalable outlines */
FT_BBox bbox;
FT_UShort units_per_EM;
FT_Short ascender;
FT_Short descender;
FT_Short height;
FT_Short max_advance_width;
FT_Short max_advance_height;
FT_Short underline_position;
FT_Short underline_thickness;
FT_GlyphSlot glyph;
FT_Size size;
FT_CharMap charmap;
/*@private begin */
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_ListRec sizes_list;
FT_Generic autohint;
void* extensions;
FT_Face_Internal internal;
/*@private end */
} FT_FaceRec;
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_SCALABLE */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face provides */
/* vectorial outlines (i.e., TrueType or Type1). This doesn't */
/* prevent embedding of bitmap strikes though, i.e., a given face can */
/* have both this bit set, and a `num_fixed_sizes' property > 0. */
/* */
#define FT_FACE_FLAG_SCALABLE 1
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_FIXED_SIZES */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face contains */
/* `fixed sizes', i.e., bitmap strikes for some given pixel sizes. */
/* See the `num_fixed_sizes' and `available_sizes' face properties */
/* for more information. */
/* */
#define FT_FACE_FLAG_FIXED_SIZES 2
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_FIXED_WIDTH */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face contains */
/* fixed-width characters (like Courier, Lucida, MonoType, etc.). */
/* */
#define FT_FACE_FLAG_FIXED_WIDTH 4
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_SFNT */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face uses the */
/* `sfnt' storage fomat. For now, this means TrueType or OpenType. */
/* */
#define FT_FACE_FLAG_SFNT 8
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_HORIZONTAL */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face contains */
/* horizontal glyph metrics. This should be set for all common */
/* formats, but who knows. */
/* */
#define FT_FACE_FLAG_HORIZONTAL 0x10
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_VERTICAL */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face contains */
/* vertical glyph metrics. If not set, the glyph loader will */
/* synthetize vertical metrics itself to help display vertical text */
/* correctly. */
/* */
#define FT_FACE_FLAG_VERTICAL 0x20
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_KERNING */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face contains */
/* kerning information. When set, this information can be retrieved */
/* through the function FT_Get_Kerning(). Note that when unset, this */
/* function will always return the kerning vector (0,0). */
/* */
#define FT_FACE_FLAG_KERNING 0x40
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_FAST_GLYPHS */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that the glyphs in a given */
/* font can be retrieved very quickly, and that a glyph cache is thus */
/* not necessary for any of its child size objects. */
/* */
/* This flag should really be set for fixed-size formats like FNT, */
/* where each glyph bitmap is available directly in binary form */
/* without any kind of compression. */
/* */
#define FT_FACE_FLAG_FAST_GLYPHS 0x80
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_MULTIPLE_MASTERS */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that the font contains */
/* multiple masters and is capable of interpolating between them. */
/* */
#define FT_FACE_FLAG_MULTIPLE_MASTERS 0x100
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_GLYPH_NAMES */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that the font contains */
/* glyph names that can be retrieved through FT_Get_Glyph_Name(). */
/* */
#define FT_FACE_FLAG_GLYPH_NAMES 0x200
/*************************************************************************/
/* */
/* <Constant> */
/* FT_FACE_FLAG_EXTERNAL_STREAM */
/* */
/* <Description> */
/* This bit field is used internally by FreeType to indicate that */
/* a face's stream was provided by the client application and should */
/* not be destroyed by FT_Done_Face(). */
/* */
#define FT_FACE_FLAG_EXTERNAL_STREAM 0x4000
/* */
#define FT_HAS_HORIZONTAL( face ) \
( face->face_flags & FT_FACE_FLAG_HORIZONTAL )
#define FT_HAS_VERTICAL( face ) \
( face->face_flags & FT_FACE_FLAG_VERTICAL )
#define FT_HAS_KERNING( face ) \
( face->face_flags & FT_FACE_FLAG_KERNING )
#define FT_IS_SCALABLE( face ) \
( face->face_flags & FT_FACE_FLAG_SCALABLE )
#define FT_IS_SFNT( face ) \
( face->face_flags & FT_FACE_FLAG_SFNT )
#define FT_IS_FIXED_WIDTH( face ) \
( face->face_flags & FT_FACE_FLAG_FIXED_WIDTH )
#define FT_HAS_FIXED_SIZES( face ) \
( face->face_flags & FT_FACE_FLAG_FIXED_SIZES )
#define FT_HAS_FAST_GLYPHS( face ) \
( face->face_flags & FT_FACE_FLAG_FAST_GLYPHS )
#define FT_HAS_GLYPH_NAMES( face ) \
( face->face_flags & FT_FACE_FLAG_GLYPH_NAMES )
#define FT_HAS_MULTIPLE_MASTERS( face ) \
( face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS )
/*************************************************************************/
/* */
/* <Constant> */
/* FT_STYLE_FLAG_ITALIC */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face is */
/* italicized. */
/* */
#define FT_STYLE_FLAG_ITALIC 1
/*************************************************************************/
/* */
/* <Constant> */
/* FT_STYLE_FLAG_BOLD */
/* */
/* <Description> */
/* A bit-field constant, used to indicate that a given face is */
/* emboldened. */
/* */
#define FT_STYLE_FLAG_BOLD 2
/*************************************************************************/
/* */
/* <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;
/*************************************************************************/
/* */
/* FreeType base size metrics */
/* */
/* <Struct> */
/* FT_Size_Metrics */
/* */
/* <Description> */
/* The size metrics structure returned scaled important distances for */
/* a given size object. */
/* */
/* <Fields> */
/* x_ppem :: The character width, expressed in integer pixels. */
/* This is the width of the EM square expressed in */
/* pixels, hence the term `ppem' (pixels per EM). */
/* */
/* y_ppem :: The character height, expressed in integer pixels. */
/* This is the height of the EM square expressed in */
/* pixels, hence the term `ppem' (pixels per EM). */
/* */
/* x_scale :: A simple 16.16 fixed point format coefficient used */
/* to scale horizontal distances expressed in font */
/* units to fractional (26.6) pixel coordinates. */
/* */
/* y_scale :: A simple 16.16 fixed point format coefficient used */
/* to scale vertical distances expressed in font */
/* units to fractional (26.6) pixel coordinates. */
/* */
/* ascender :: The ascender, expressed in 26.6 fixed point */
/* pixels. Always positive. */
/* */
/* descender :: The descender, expressed in 26.6 fixed point */
/* pixels. Always positive. */
/* */
/* height :: The text height, expressed in 26.6 fixed point */
/* pixels. Always positive. */
/* */
/* max_advance :: Maximum horizontal advance, expressed in 26.6 */
/* fixed point pixels. Always positive. */
/* */
/* <Note> */
/* The values of `ascender', `descender', and `height' are only the */
/* scaled versions of `face->ascender', `face->descender', and */
/* `face->height'. */
/* */
/* Unfortunately, due to glyph hinting, these values might not be */
/* exact for certain fonts, they thus must be treated as unreliable */
/* with an error margin of at least one pixel! */
/* */
/* Indeed, the only way to get the exact pixel ascender and descender */
/* is to render _all_ glyphs. As this would be a definite */
/* performance hit, it is up to client applications to perform such */
/* computations. */
/* */
typedef struct FT_Size_Metrics_
{
FT_UShort x_ppem; /* horizontal pixels per EM */
FT_UShort y_ppem; /* vertical pixels per EM */
FT_Fixed x_scale; /* two scales used to convert font units */
FT_Fixed y_scale; /* to 26.6 frac. pixel coordinates.. */
FT_Pos ascender; /* ascender in 26.6 frac. pixels */
FT_Pos descender; /* descender in 26.6 frac. pixels */
FT_Pos height; /* text height in 26.6 frac. pixels */
FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */
} FT_Size_Metrics;
/*************************************************************************/
/* */
/* FreeType base size class */
/* */
/* <Struct> */
/* FT_SizeRec */
/* */
/* <Description> */
/* FreeType root size class structure. A size object models the */
/* resolution and pointsize dependent data of a given face. */
/* */
/* <Fields> */
/* face :: Handle to the parent face object. */
/* */
/* generic :: A typeless pointer, which is unused by the FreeType */
/* library or any of its drivers. It can be used by */
/* client applications to link their own data to each size */
/* object. */
/* */
/* metrics :: Metrics for this size object. This field is read-only. */
/* */
typedef struct FT_SizeRec_
{
FT_Face face; /* parent face object */
FT_Generic generic; /* generic pointer for client uses */
FT_Size_Metrics metrics; /* size metrics */
FT_Size_Internal internal;
} FT_SizeRec;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_SubGlyph */
/* */
/* <Description> */
/* The subglyph structure is an internal object used to describe */
/* subglyphs (for example, in the case of composites). */
/* */
/* <Note> */
/* The subglyph implementation is not part of the high-level API, */
/* hence the forward structure declaration. */
/* */
typedef struct FT_SubGlyph_ 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;
/*************************************************************************/
/* */
/* FreeType Glyph Slot base class */
/* */
/* <Struct> */
/* FT_GlyphSlotRec */
/* */
/* <Description> */
/* FreeType root glyph slot class structure. A glyph slot is a */
/* container where individual glyphs can be loaded, be they */
/* vectorial or bitmap/graymaps. */
/* */
/* <Fields> */
/* library :: A handle to the FreeType library instance */
/* this slot belongs to. */
/* */
/* face :: A handle to the parent face object. */
/* */
/* next :: In some cases (like some font tools), several */
/* glyph slots per face object can be a good */
/* thing. As this is rare, the glyph slots are */
/* listed through a direct, single-linked list */
/* using its `next' field. */
/* */
/* generic :: A typeless pointer which is unused by the */
/* FreeType library or any of its drivers. It */
/* can be used by client applications to link */
/* their own data to each size object. */
/* */
/* metrics :: The metrics of the last loaded glyph in the */
/* slot. The returned values depend on the last */
/* load flags (see the FT_Load_Glyph() API */
/* function) and can be expressed either in 26.6 */
/* fractional pixels or font units. */
/* */
/* Note that even when the glyph image is */
/* transformed, the metrics are not. */
/* */
/* linearHoriAdvance :: For scalable formats only, this field holds */
/* the linearly scaled horizontal advance width */
/* for the glyph (i.e. the scaled and unhinted */
/* value of the hori advance). This can be */
/* important to perform correct WYSIWYG layout. */
/* */
/* Note that this value is expressed by default */
/* in 16.16 pixels. However, when the glyph is */
/* loaded with the FT_LOAD_LINEAR_DESIGN flag, */
/* this field contains simply the value of the */
/* advance in original font units. */
/* */
/* linearVertAdvance :: For scalable formats only, this field holds */
/* the linearly scaled vertical advance height */
/* for the glyph. See linearHoriAdvance for */
/* comments. */
/* */
/* advance :: This is the transformed advance width for the */
/* glyph. */
/* */
/* format :: This field indicates the format of the image */
/* contained in the glyph slot. Typically */
/* ft_glyph_format_bitmap, */
/* ft_glyph_format_outline, and */
/* ft_glyph_format_composite, but others are */
/* possible. */
/* */
/* bitmap :: This field is used as a bitmap descriptor */
/* when the slot format is */
/* ft_glyph_format_bitmap. Note that the */
/* address and content of the bitmap buffer can */
/* change between calls of FT_Load_Glyph() and a */
/* few other functions. */
/* */
/* bitmap_left :: This is the bitmap's left bearing expressed */
/* in integer pixels. Of course, this is only */
/* valid if the format is */
/* ft_glyph_format_bitmap. */
/* */
/* bitmap_top :: This is the bitmap's top bearing expressed in */
/* integer pixels. Remember that this is the */
/* distance from the baseline to the top-most */
/* glyph scanline, upwards y-coordinates being */
/* *positive*. */
/* */
/* outline :: The outline descriptor for the current glyph */
/* image if its format is */
/* ft_glyph_bitmap_outline. */
/* */
/* num_subglyphs :: The number of subglyphs in a composite glyph. */
/* This format 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. */
/* */
/* control_data :: Certain font drivers can also return the */
/* control data for a given glyph image (e.g. */
/* TrueType bytecode, Type 1 charstrings, etc.). */
/* This field is a pointer to such data. */
/* */
/* control_len :: This is the length in bytes of the control */
/* data. */
/* */
/* other :: Really wicked formats can use this pointer to */
/* present their own glyph image to client apps. */
/* Note that the app will need to know about the */
/* image format. */
/* */
/* <Note> */
/* If FT_Load_Glyph() is called with default flags (FT_LOAD_DEFAULT), */
/* the glyph image is loaded in the glyph slot in its native format */
/* (e.g. a vectorial outline for TrueType and Type 1 formats). */
/* */
/* This image can later be converted into a bitmap by calling */
/* FT_Render_Glyph(). This function finds the current renderer for */
/* the native image's format then invokes it. */
/* */
/* The renderer is in charge of transforming the native image through */
/* the slot's face transformation fields, then convert it into a */
/* bitmap that is returned in `slot->bitmap'. */
/* */
/* Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */
/* to specify the position of the bitmap relative to the current pen */
/* position (e.g. coordinates [0,0] on the baseline). Of course, */
/* `slot->format' is also changed to `ft_glyph_format_bitmap' . */
/* */
typedef struct FT_GlyphSlotRec_
{
FT_Library library;
FT_Face face;
FT_GlyphSlot next;
FT_UInt flags;
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;
void* other;
FT_Slot_Internal internal;
} FT_GlyphSlotRec;
/*************************************************************************/
/*************************************************************************/
/* */
/* F U N C T I O N S */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* FT_Init_FreeType */
/* */
/* <Description> */
/* Initializes a new FreeType library object. The set of drivers */
/* that are registered by this function is determined at build time. */
/* */
/* <Output> */
/* alibrary :: A handle to a new library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error ) FT_Init_FreeType( FT_Library *alibrary );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_FreeType */
/* */
/* <Description> */
/* Destroys a given FreeType library object and all of its childs, */
/* including resources, drivers, faces, sizes, etc. */
/* */
/* <Input> */
/* library :: A handle to the target library object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error ) FT_Done_FreeType( FT_Library library );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Open_Flags */
/* */
/* <Description> */
/* An enumeration used to list the bit flags used within */
/* FT_Open_Args(). */
/* */
/* <Fields> */
/* 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 pathname. */
/* */
/* ft_open_driver :: Use the `driver' field. */
/* */
/* ft_open_params :: Use the `num_params' & `params' field. */
/* */
typedef enum
{
ft_open_memory = 1,
ft_open_stream = 2,
ft_open_pathname = 4,
ft_open_driver = 8,
ft_open_params = 16
} FT_Open_Flags;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Parameter */
/* */
/* <Description> */
/* A simple structure used to pass more or less generic parameters */
/* to FT_Open_Face(). */
/* */
/* <Fields> */
/* tag :: A 4-byte identification tag. */
/* */
/* data :: A pointer to the parameter data. */
/* */
/* <Note> */
/* The id and function of parameters are driver-specific. */
/* */
typedef struct FT_Parameter_
{
FT_ULong tag;
FT_Pointer data;
} FT_Parameter;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_Open_Args */
/* */
/* <Description> */
/* A structure used to indicate how to open a new font file/stream. */
/* A pointer to such a structure can be used as a parameter for the */
/* functions FT_Open_Face() & FT_Attach_Stream(). */
/* */
/* <Fields> */
/* flags :: A set of bit flags indicating how to use the */
/* structure. */
/* */
/* memory_base :: The first byte of the file in memory. */
/* */
/* memory_size :: The size in bytes of the file in memory. */
/* */
/* pathname :: A pointer to an 8-bit file pathname. */
/* */
/* stream :: A handle to a source stream object. */
/* */
/* driver :: This field is exclusively used by FT_Open_Face(); */
/* it simply specifies the font driver to use to open */
/* the face. If set to 0, FreeType will try 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> */
/* `stream_type' determines which fields are used to create a new */
/* input stream. */
/* */
/* If it is `ft_stream_memory', a new memory-based stream will be */
/* created using the memory block specified by `memory_base' and */
/* `memory_size'. */
/* */
/* If it is `ft_stream_pathname', a new stream will be created with */
/* the `pathname' field, calling the system-specific FT_New_Stream() */
/* function. */
/* */
/* If is is `ft_stream_copy', then the content of `stream' will be */
/* copied to a new input stream object. The object will be closed */
/* and destroyed when the face is destroyed itself. Note that this */
/* means that you should not close the stream before the library */
/* does! */
/* */
typedef struct FT_Open_Args_
{
FT_Open_Flags flags;
FT_Byte* memory_base;
FT_Long memory_size;
FT_String* pathname;
FT_Stream stream;
FT_Module driver;
FT_Int num_params;
FT_Parameter* params;
} FT_Open_Args;
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a pathname to the font file. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* pathname :: A path to the font file. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `aface'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT( FT_Error ) FT_New_Face( FT_Library library,
const char* filepathname,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Memory_Face */
/* */
/* <Description> */
/* Creates a new face object from a given resource and typeface index */
/* using a font file already loaded into memory. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* file_base :: A pointer to the beginning of the font data. */
/* */
/* file_size :: The size of the memory chunk used by the font data. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_New_Memory_Face() can be used to determine and/or check the */
/* font format of a given font resource. If the `face_index' field */
/* is negative, the function will _not_ return any face handle in */
/* `aface'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT( FT_Error ) FT_New_Memory_Face( FT_Library library,
FT_Byte* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Open_Face */
/* */
/* <Description> */
/* Opens a face object from a given resource and typeface index using */
/* an `FT_Open_Args' structure. If the face object doesn't exist, it */
/* will be created. */
/* */
/* <InOut> */
/* library :: A handle to the library resource. */
/* */
/* <Input> */
/* args :: A pointer to an `FT_Open_Args' structure which must */
/* be filled by the caller. */
/* */
/* face_index :: The index of the face within the resource. The */
/* first face has index 0. */
/* <Output> */
/* aface :: A handle to a new face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Unlike FreeType 1.x, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->glyph'. */
/* */
/* Note that additional slots can be added to each face with the */
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
/* list through their `next' field. */
/* */
/* FT_Open_Face() can be used to determine and/or check the font */
/* format of a given font resource. If the `face_index' field is */
/* negative, the function will _not_ return any face handle in */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT( FT_Error ) FT_Open_Face( FT_Library library,
FT_Open_Args* args,
FT_Long face_index,
FT_Face *aface );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* `Attaches' a given font file to an existing face. This is usually */
/* to read additional information for a single face object. For */
/* example, it is used to read the AFM files that come with Type 1 */
/* fonts in order to add kerning data and other metrics. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* filepathname :: An 8-bit pathname naming the `metrics' file. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, use FT_Attach_Stream(). */
/* */
/* The meaning of the `attach' action (i.e., what really happens when */
/* the new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT( FT_Error ) FT_Attach_File( FT_Face face,
const char* filepathname );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_Stream */
/* */
/* <Description> */
/* This function is similar to FT_Attach_File() with the exception */
/* that it reads the attachment from an arbitrary stream. */
/* */
/* <InOut> */
/* face :: The target face object. */
/* */
/* <Input> */
/* parameters :: A pointer to an FT_Open_Args structure used to */
/* describe the input stream to FreeType. */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* The meaning of the `attach' (i.e. what really happens when the */
/* new file is read) is not fixed by FreeType itself. It really */
/* depends on the font format (and thus the font driver). */
/* */
/* Client applications are expected to know what they are doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments. */
/* */
FT_EXPORT( FT_Error ) FT_Attach_Stream( FT_Face face,
FT_Open_Args* parameters );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Done_Face */
/* */
/* <Description> */
/* Discards a given face object, as well as all of its child slots */
/* and sizes. */
/* */
/* <Input> */
/* face :: A handle to a target face object. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error ) FT_Done_Face( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The */
/* `char_width' and `char_height' values are used for the width and */
/* height, respectively, expressed in 26.6 fractional points. */
/* */
/* If the horizontal or vertical resolution values are zero, a */
/* default value of 72dpi is used. Similarly, if one of the */
/* character dimensions is zero, its value is set equal to the other. */
/* */
/* <InOut> */
/* size :: A handle to a target size object. */
/* */
/* <Input> */
/* char_width :: The character width, in 26.6 fractional points. */
/* */
/* char_height :: The character height, in 26.6 fractional */
/* points. */
/* */
/* horz_resolution :: The horizontal resolution. */
/* */
/* vert_resolution :: The vertical resolution. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* When dealing with fixed-size faces (i.e., non-scalable formats), */
/* use the function FT_Set_Pixel_Sizes(). */
/* */
FT_EXPORT( FT_Error ) FT_Set_Char_Size( FT_Face face,
FT_F26Dot6 char_width,
FT_F26Dot6 char_height,
FT_UInt horz_resolution,
FT_UInt vert_resolution );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Pixel_Sizes */
/* */
/* <Description> */
/* Sets the character dimensions of a given face object. The width */
/* and height are expressed in integer pixels. */
/* */
/* If one of the character dimensions is zero, its value is set equal */
/* to the other. */
/* */
/* <InOut> */
/* face :: A handle to the target face object. */
/* */
/* <Input> */
/* pixel_width :: The character width, in integer pixels. */
/* */
/* pixel_height :: The character height, in integer pixels. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* */
/* <Note> */
/* The values of `pixel_width' and `pixel_height' correspond to the */
/* pixel values of the _typographic_ character size, which are NOT */
/* necessarily the same as the dimensions of the glyph `bitmap */
/* cells'. */
/* */
/* The `character size' is really the size of an abstract square */
/* called the `EM', used to design the font. However, depending */
/* on the font design, glyphs will be smaller or greater than the */
/* EM. */
/* */
/* This means that setting the pixel size to, say, 8x8 doesn't */
/* guarantee in any way that you will get glyph bitmaps that all fit */
/* within an 8x8 cell (sometimes even far from it). */
/* */
FT_EXPORT( FT_Error ) FT_Set_Pixel_Sizes( FT_Face face,
FT_UInt pixel_width,
FT_UInt pixel_height );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Glyph */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size. */
/* */
/* <InOut> */
/* face :: A handle to the target face object where the glyph */
/* will be loaded. */
/* */
/* <Input> */
/* glyph_index :: The index of the glyph in the font file. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
/* transformed with the information passed to a previous call to */
/* FT_Set_Transform(). */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT( FT_Error ) FT_Load_Glyph( FT_Face face,
FT_UInt glyph_index,
FT_Int load_flags );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Load_Char */
/* */
/* <Description> */
/* A function used to load a single glyph within a given glyph slot, */
/* for a given size, according to its character code. */
/* */
/* <InOut> */
/* face :: A handle to a target face object where the glyph */
/* will be loaded. */
/* */
/* <Input> */
/* char_code :: The glyph's character code, according to the */
/* current charmap used in the face. */
/* */
/* load_flags :: A flag indicating what to load for this glyph. The */
/* FT_LOAD_XXX constants can be used to control the */
/* glyph loading process (e.g., whether the outline */
/* should be scaled, whether to load bitmaps or not, */
/* whether to hint the outline, etc). */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* If the face has no current charmap, or if the character code */
/* is not defined in the charmap, this function will return an */
/* error. */
/* */
/* If the glyph image is not a bitmap, and if the bit flag */
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
/* transformed with the information passed to a previous call to */
/* FT_Set_Transform(). */
/* */
/* Note that this also transforms the `face.glyph.advance' field, but */
/* *not* the values in `face.glyph.metrics'. */
/* */
FT_EXPORT( FT_Error ) FT_Load_Char( FT_Face face,
FT_ULong char_code,
FT_Int load_flags );
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_NO_SCALE */
/* */
/* <Description> */
/* A bit field constant, used with FT_Load_Glyph() to indicate that */
/* the vector outline being loaded should not be scaled to 26.6 */
/* fractional pixels, but kept in notional units. */
/* */
#define FT_LOAD_NO_SCALE 1
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_NO_HINTING */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the vector outline being loaded should not be fitted to the pixel */
/* grid but simply scaled to 26.6 fractional pixels. */
/* */
/* This flag is ignored if FT_LOAD_NO_SCALE is set. */
/* */
#define FT_LOAD_NO_HINTING 2
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_RENDER */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should load the glyph and immediately convert it into */
/* a bitmap, if necessary, by calling FT_Render_Glyph(). */
/* */
/* Note that by default, FT_Load_Glyph() loads the glyph image in its */
/* native format. */
/* */
#define FT_LOAD_RENDER 4
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_NO_BITMAP */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should not load the bitmap or pixmap of a given */
/* glyph. This is useful when you do not want to load the embedded */
/* bitmaps of scalable formats, as the native glyph image will be */
/* loaded, and can then be rendered through FT_Render_Glyph(). */
/* */
#define FT_LOAD_NO_BITMAP 8
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_VERTICAL_LAYOUT */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the glyph image should be prepared for vertical layout. This */
/* basically means that `face.glyph.advance' will correspond to the */
/* vertical advance height (instead of the default horizontal */
/* advance width), and that the glyph image will translated to match */
/* the vertical bearings positions. */
/* */
#define FT_LOAD_VERTICAL_LAYOUT 16
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_FORCE_AUTOHINT */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should try to auto-hint the glyphs, even if a driver */
/* specific hinter is available. */
/* */
#define FT_LOAD_FORCE_AUTOHINT 32
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_CROP_BITMAP */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the font driver should try to crop the bitmap (i.e. remove all */
/* space around its black bits) when loading it. For now, this */
/* really only works with embedded bitmaps in TrueType fonts. */
/* */
#define FT_LOAD_CROP_BITMAP 64
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_PEDANTIC */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the glyph loader should perform a pedantic bytecode */
/* interpretation. Many popular fonts come with broken glyph */
/* programs. When this flag is set, loading them will return an */
/* error. Otherwise, errors are ignored by the loader, sometimes */
/* resulting in ugly glyphs. */
/* */
#define FT_LOAD_PEDANTIC 128
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the glyph loader should ignore the global advance width defined */
/* in the font. As far as we know, this is only used by the */
/* X-TrueType font server, in order to deal correctly with the */
/* incorrect metrics contained in DynaLab's TrueType CJK fonts. */
/* */
#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH 512
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_NO_RECURSE */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the glyph loader should not load composite glyph recursively. */
/* Rather, when a composite glyph is encountered, it should set */
/* the values of `num_subglyphs' and `subglyphs', as well as set */
/* `face->glyph.format' to ft_glyph_format_composite. */
/* */
/* This is for use by the auto-hinter and possibly other tools. */
/* For nearly all applications, this flags should be left unset */
/* when invoking FT_Load_Glyph(). */
/* */
/* Note that the flag forces the load of unscaled glyphs. */
/* */
#define FT_LOAD_NO_RECURSE 1024
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_IGNORE_TRANSFORM */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the glyph loader should not try to transform the loaded glyph */
/* image. */
/* */
#define FT_LOAD_IGNORE_TRANSFORM 2048
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_MONOCHROME */
/* */
/* <Description> */
/* Only used with FT_LOAD_RENDER set, it indicates that the returned */
/* glyph image should be 1-bit monochrome. This really tells the */
/* glyph loader to use `ft_render_mode_mono' when calling */
/* FT_Render_Glyph(). */
/* */
#define FT_LOAD_MONOCHROME 4096
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_LINEAR_DESIGN */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should return the linearly scaled metrics expressed */
/* in original font units, instead of the default 16.16 pixel values. */
/* */
#define FT_LOAD_LINEAR_DESIGN 8192
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_DEFAULT */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should try to load the glyph normally, i.e., */
/* embedded bitmaps are favored over outlines, vectors are always */
/* scaled and grid-fitted. */
/* */
#define FT_LOAD_DEFAULT 0
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Transform */
/* */
/* <Description> */
/* A function used to set the transformation that is applied to glyph */
/* images just before they are converted to bitmaps in a glyph slot */
/* when FT_Render_Glyph() is called. */
/* */
/* <InOut> */
/* face :: A handle to the source face object. */
/* */
/* <Input> */
/* matrix :: A pointer to the transformation's 2x2 matrix. Use 0 for */
/* the identity matrix. */
/* delta :: A pointer to the translation vector. Use 0 for the null */
/* vector. */
/* */
/* <Note> */
/* The transformation is only applied to scalable image formats after */
/* the glyph has been loaded. It means that hinting is unaltered by */
/* the transformation and is performed on the character size given in */
/* the last call to FT_Set_Char_Sizes() or FT_Set_Pixel_Sizes(). */
/* */
FT_EXPORT( void ) FT_Set_Transform( FT_Face face,
FT_Matrix* matrix,
FT_Vector* delta );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Render_Mode */
/* */
/* <Description> */
/* An enumeration type that lists the render modes supported by the */
/* FreeType 2 renderer(s). A renderer is in charge of converting a */
/* glyph image into a bitmap. */
/* */
/* <Fields> */
/* ft_render_mode_normal :: This is the default render mode; it */
/* corresponds to 8-bit anti-aliased */
/* bitmaps, using 256 levels of gray. */
/* */
/* ft_render_mode_mono :: This render mode is used to produce 1-bit */
/* monochrome bitmaps. */
/* */
/* <Note> */
/* There is no render mode to produce 8-bit `monochrome' bitmaps -- */
/* you have to make the conversion yourself if you need such things */
/* (besides, FreeType is not a graphics library). */
/* */
/* More modes might appear later for specific display modes (e.g. TV, */
/* LCDs, etc.). They will be supported through the simple addition */
/* of a renderer module, with no changes to the rest of the engine. */
/* */
typedef enum FT_Render_Mode_
{
ft_render_mode_normal = 0,
ft_render_mode_mono = 1
} FT_Render_Mode;
/*************************************************************************/
/* */
/* <Function> */
/* FT_Render_Glyph */
/* */
/* <Description> */
/* Converts a given glyph image to a bitmap. It does so by */
/* inspecting the glyph image format, find the relevant renderer, and */
/* invoke it. */
/* */
/* <InOut> */
/* slot :: A handle to the glyph slot containing the image to */
/* convert. */
/* */
/* <Input> */
/* render_mode :: This is the render mode used to render the glyph */
/* image into a bitmap. See FT_Render_Mode for a list */
/* of possible values. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT( FT_Error ) FT_Render_Glyph( FT_GlyphSlot slot,
FT_UInt render_mode );
/*************************************************************************/
/* */
/* <Enum> */
/* FT_Kerning_Mode */
/* */
/* <Description> */
/* An enumeration used to specify which kerning values to return in */
/* FT_Get_Kerning(). */
/* */
/* <Fields> */
/* ft_kerning_default :: Return scaled and grid-fitted kerning */
/* distances (value is 0). */
/* */
/* ft_kerning_unfitted :: Return scaled but un-grid-fitted kerning */
/* distances. */
/* */
/* ft_kerning_unscaled :: Return the kerning vector in original font */
/* units. */
/* */
typedef enum FT_Kerning_Mode_
{
ft_kerning_default = 0,
ft_kerning_unfitted,
ft_kerning_unscaled
} FT_Kerning_Mode;
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Kerning */
/* */
/* <Description> */
/* Returns the kerning vector between two glyphs of a same face. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* left_glyph :: The index of the left glyph in the kern pair. */
/* */
/* right_glyph :: The index of the right glyph in the kern pair. */
/* */
/* kern_mode :: See FT_Kerning_Mode() for more information. */
/* Determines the scale/dimension of the returned */
/* kerning vector. */
/* */
/* <Output> */
/* akerning :: The kerning vector. This is in font units for */
/* scalable formats, and in pixels for fixed-sizes */
/* formats. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* Only horizontal layouts (left-to-right & right-to-left) are */
/* supported by this method. Other layouts, or more sophisticated */
/* kernings, are out of the scope of this API function -- they can be */
/* implemented through format-specific interfaces. */
/* */
FT_EXPORT( FT_Error ) FT_Get_Kerning( FT_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_UInt kern_mode,
FT_Vector *akerning );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Glyph_Name */
/* */
/* <Description> */
/* Retrieves the ASCII name of a given glyph in a face. This only */
/* works for those faces where FT_HAS_GLYPH_NAME(face) returns true. */
/* */
/* <Input> */
/* face :: A handle to a source face object. */
/* */
/* glyph_index :: The glyph index. */
/* */
/* buffer_max :: The maximal number of bytes available in the */
/* buffer. */
/* */
/* <Output> */
/* buffer :: A pointer to a target buffer where the name will be */
/* copied to. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* An error is returned if the face doesn't provide glyph names or if */
/* the glyph index is invalid. In all cases of failure, the first */
/* byte of `buffer' will be set to 0 to indicate an empty name. */
/* */
/* The glyph name is truncated to fit within the buffer if it is too */
/* long. The returned string is always zero-terminated. */
/* */
/* This function is not compiled within the library if the config */
/* macro FT_CONFIG_OPTION_NO_GLYPH_NAMES is defined in */
/* `include/freetype/config/ftoptions.h' */
/* */
FT_EXPORT( FT_Error ) FT_Get_Glyph_Name( FT_Face face,
FT_UInt glyph_index,
FT_Pointer buffer,
FT_UInt buffer_max );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Charmap */
/* */
/* <Description> */
/* Selects a given charmap by its encoding tag (as listed in */
/* `freetype.h'). */
/* */
/* <InOut> */
/* face :: A handle to the source face object. */
/* */
/* <Input> */
/* encoding :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error if no charmap in the face */
/* corresponds to the encoding queried here. */
/* */
FT_EXPORT( FT_Error ) FT_Select_Charmap( FT_Face face,
FT_Encoding encoding );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Charmap */
/* */
/* <Description> */
/* Selects a given charmap for character code to glyph index */
/* decoding. */
/* */
/* <InOut> */
/* face :: A handle to the source face object. */
/* */
/* <Input> */
/* charmap :: A handle to the selected charmap. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <Note> */
/* This function will return an error if the charmap is not part of */
/* the face (i.e., if it is not listed in the face->charmaps[] */
/* table). */
/* */
FT_EXPORT( FT_Error ) FT_Set_Charmap( FT_Face face,
FT_CharMap charmap );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Get_Char_Index */
/* */
/* <Description> */
/* Returns the glyph index of a given character code. This function */
/* uses a charmap object to do the translation. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* */
/* charcode :: The character code. */
/* */
/* <Return> */
/* The glyph index. 0 means `undefined character code'. */
/* */
FT_EXPORT( FT_UInt ) FT_Get_Char_Index( FT_Face face,
FT_ULong charcode );
/*************************************************************************/
/* */
/* <Function> */
/* FT_MulDiv */
/* */
/* <Description> */
/* A very simple function used to perform the computation `(a*b)/c' */
/* with maximal accuracy (it uses a 64-bit intermediate integer */
/* whenever necessary). */
/* */
/* This function isn't necessarily as fast as some processor specific */
/* operations, but is at least completely portable. */
/* */
/* <Input> */
/* a :: The first multiplier. */
/* b :: The second multiplier. */
/* c :: The divisor. */
/* */
/* <Return> */
/* The result of `(a*b)/c'. This function never traps when trying to */
/* divide by zero; it simply returns `MaxInt' or `MinInt' depending */
/* on the signs of `a' and `b'. */
/* */
FT_EXPORT( FT_Long ) FT_MulDiv( FT_Long a,
FT_Long b,
FT_Long c );
/*************************************************************************/
/* */
/* <Function> */
/* FT_MulFix */
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(a*b)/0x10000' with maximal accuracy. Most of the time this is */
/* used to multiply a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
/* a :: The first multiplier. */
/* b :: The second multiplier. Use a 16.16 factor here whenever */
/* possible (see note below). */
/* */
/* <Return> */
/* The result of `(a*b)/0x10000'. */
/* */
/* <Note> */
/* This function has been optimized for the case where the absolute */
/* value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */
/* As this happens mainly when scaling from notional units to */
/* fractional pixels in FreeType, it resulted in noticeable speed */
/* improvements between versions 2.x and 1.x. */
/* */
/* As a conclusion, always try to place a 16.16 factor as the */
/* _second_ argument of this function; this can make a great */
/* difference. */
/* */
FT_EXPORT( FT_Long ) FT_MulFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/* */
/* <Function> */
/* FT_DivFix */
/* */
/* <Description> */
/* A very simple function used to perform the computation */
/* `(a*0x10000)/b' with maximal accuracy. Most of the time, this is */
/* used to divide a given value by a 16.16 fixed float factor. */
/* */
/* <Input> */
/* a :: The first multiplier. */
/* b :: The second multiplier. Use a 16.16 factor here whenever */
/* possible (see note below). */
/* */
/* <Return> */
/* The result of `(a*0x10000)/b'. */
/* */
/* <Note> */
/* The optimization for FT_DivFix() is simple: If (a << 16) fits in */
/* 32 bits, then the division is computed directly. Otherwise, we */
/* use a specialized version of the old FT_MulDiv64(). */
/* */
FT_EXPORT( FT_Long ) FT_DivFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Vector_Transform */
/* */
/* <Description> */
/* Transforms a single vector through a 2x2 matrix. */
/* */
/* <InOut> */
/* vector :: The target vector to transform. */
/* */
/* <Input> */
/* matrix :: A pointer to the source 2x2 matrix. */
/* */
/* <Note> */
/* The result is undefined if either `vector' or `matrix' is invalid. */
/* */
FT_EXPORT( void ) FT_Vector_Transform( FT_Vector* vec,
FT_Matrix* matrix );
/* */
#ifdef __cplusplus
}
#endif
#endif /* FREETYPE_H */
/* END */
Reference in New Issue View Git Blame Copy Permalink