ref: 56177261080a288a05fd305e31268c3644777d74
dir: /include/freetype/freetype.h/
/***************************************************************************/
/* */
/* 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. Note that each driver has its own */
/* version number (for example, the TrueType driver is at 1.2, as */
/* defined by the macros TT_FREETYPE_MAJOR and TT_FREETYPE_MINOR in the */
/* file `ttlib/truetype.h'. */
/* */
#define FREETYPE_MAJOR 2
#define FREETYPE_MINOR 0
/*************************************************************************/
/* */
/* To make freetype.h independent from configuration files we check */
/* whether FT_EXPORT_DEF has been defined already. */
/* */
/* On some systems and compilers (Win32 mostly), an extra keyword is */
/* necessary to compile the library as a DLL. */
/* */
#ifndef FT_EXPORT_DEF
#define FT_EXPORT_DEF(x) extern x
#endif
#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 finalisation. */
/* 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_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_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. */
/* */
typedef enum FT_Encoding_
{
ft_encoding_none = 0,
ft_encoding_symbol = 0,
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_big5 = FT_MAKE_TAG('b','i','g','5'),
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')
/* other encodings might be defined in the future */
} FT_Encoding;
/*************************************************************************/
/* */
/* <Struct> */
/* FT_CharMapRec */
/* */
/* <Description> */
/* The base charmap class. */
/* */
/* <Fields> */
/* face :: A handle to the parent face object. */
/* */
/* flags :: A set of bit flags used to describe the charmap. */
/* Each bit indicates that a given encoding is */
/* supported. */
/* */
/* 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 */
/* */
/*************************************************************************/
/*************************************************************************/
/*************************************************************************/
/* */
/* 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. */
/* */
/* max_points :: The maximal number of points used to store */
/* the vectorial outline of any glyph in this */
/* face. If this value cannot be known in */
/* advance, or if the face isn't scalable, */
/* this should be set to 0. Only relevant for */
/* scalable formats. */
/* */
/* max_contours :: The maximal number of contours used to */
/* store the vectorial outline of any glyph in */
/* this face. If this value cannot be known */
/* in advance, or if the face isn't scalable, */
/* this should be set to 0. Only relevant for */
/* scalable formats. */
/* */
/* transform_matrix :: a 2x2 matrix of 16.16 coefficients used */
/* to transform glyph outlines after they're */
/* loaded from the font. Only used by the */
/* convenience functions. */
/* */
/* transform_delta :: a translation vector used to transform */
/* glyph outlines after they're loaded from */
/* the font. Only used by the convenience */
/* functions. */
/* */
/* transform_flags :: some flags used to classify the transform. */
/* Only used by the convenience functions. */
/* */
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;
/* the face's table of available charmaps */
FT_Int num_charmaps;
FT_CharMap* charmaps;
FT_Generic generic;
/* the following are only relevant for 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;
/************************************************************/
/* The following fields should be considered private and */
/* rarely, if ever, used by client applications.. */
FT_Driver driver;
FT_Memory memory;
FT_Stream stream;
FT_GlyphSlot glyph;
FT_Size size;
FT_CharMap charmap;
FT_ListRec sizes_list;
void* autohint_globals;
void* extensions;
FT_UShort max_points;
FT_Short max_contours;
FT_Matrix transform_matrix;
FT_Vector transform_delta;
FT_Int transform_flags;
} 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_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_FIXED_WIDTH */
/* */
/* <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_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
#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_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
/*************************************************************************/
/* */
/* FreeType base size metrics */
/* */
/* <Struct> */
/* FT_Size_Metrics */
/* */
/* <Description> */
/* The size metrics structure returned scaled important distances for */
/* a given size object. */
/* */
/* <Fields> */
/* pointSize :: The current point size in 26.6 points, where */
/* 1 point equals 1/72 inch. */
/* */
/* 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. */
/* */
/* x_resolution :: The horizontal device resolution for this size */
/* object, expressed in integer dots per inches */
/* (dpi). As a convention, fixed font formats set */
/* this value to 72. */
/* */
/* y_resolution :: The vertical device resolution for this size */
/* object, expressed in integer dots per inches */
/* (dpi). As a convention, fixed font formats set */
/* this value to 72. */
/* */
/* 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's 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_SizeRec;
typedef struct FT_SubGlyph_ FT_SubGlyph;
struct FT_SubGlyph_
{
FT_Int index;
FT_UShort flags;
FT_Int arg1;
FT_Int arg2;
FT_Matrix transform;
};
#define FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS 1
#define FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES 2
#define FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID 4
#define FT_SUBGLYPH_FLAG_SCALE 8
#define FT_SUBGLYPH_FLAG_XY_SCALE 0x40
#define FT_SUBGLYPH_FLAG_2X2 0x80
#define FT_SUBGLYPH_FLAG_USE_MY_METRICS 0x200
/*************************************************************************/
/* */
/* 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> */
/* 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. */
/* */
/* 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. */
/* */
/* metrics2 :: This field is used to return alternate glyph metrics */
/* for scalable formats. Only four fields in it are */
/* valid: horiBearingX, horiAdvance, vertBearingY and */
/* vertAdvance. All other fields should be ignored. */
/* By default, it contains the glyph metrics expressed */
/* in font units. However, when FT_Load_Glyph() is called */
/* with FT_LOAD_LINEAR set, the metrics are expressed */
/* in 16.16 unhinted pixel values.. This can be useful */
/* to perform WYSIWYG glyph layout.. */
/* */
/* 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. */
/* */
/* outline :: The outline descriptor for the current glyph, if it */
/* is a vectorial one. The nature of the last loaded */
/* glyph can be retrieved through the result value */
/* returned by FT_Load_Glyph(). */
/* */
/* bitmap :: The bitmap/graymap descriptor for the current glyph, */
/* if it is a fixed-width one. The nature of the last */
/* loaded glyph can be retrieved through the result value */
/* returned by FT_Load_Glyph(). */
/* */
enum
{
ft_glyph_own_bitmap = 1
};
typedef struct FT_GlyphSlotRec_
{
FT_Face face;
FT_GlyphSlot next;
FT_UInt flags;
FT_Glyph_Metrics metrics;
FT_Glyph_Metrics metrics2;
FT_Glyph_Format format;
FT_Bitmap bitmap;
FT_Outline outline;
FT_Int num_subglyphs;
FT_Int max_subglyphs;
FT_SubGlyph* subglyphs;
void* control_data;
long control_len;
void* other;
} 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> */
/* library :: A handle to a new library object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Init_FreeType( FT_Library* library );
/*************************************************************************/
/* */
/* <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 a target library object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Done_FreeType( FT_Library library );
/*************************************************************************/
/* */
/* <Function> */
/* 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;
/*************************************************************************/
/* */
/* <Function> */
/* FT_Parameter */
/* */
/* <Description> */
/* A simple structure used to pass more or less generic parameters */
/* to FT_Open_Face.. */
/* */
/* <Fields> */
/* tag :: 4-byte identification tag */
/* data :: pointer to parameter data */
/* */
/* <Note> */
/* the id and role of parameters is 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
* function FT_Open_Face & FT_Attach_Stream.
*
* <Fields>
* flags :: set of bit flags indicating how to use the structure
*
* memory_base :: first byte of file in memory
* memory_size :: size in bytes of file in memory
*
* pathname :: a pointer to an 8-bit file pathname
*
* stream :: 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 :: number of parameters
* params :: extra parameters passed to the font driver when
* opening a new face
*
* <Note>
* The 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
*
* It 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_Driver driver;
FT_Int num_params;
FT_Parameter* params;
} FT_Open_Args;
/*************************************************************************/
/* */
/* <Function> */
/* FT_New_Face */
/* */
/* <Description> */
/* Creates a new face object from a given font file and typeface */
/* index. */
/* */
/* <Input> */
/* library :: handle to the root FreeType library instance */
/* */
/* filepathname :: an 8-bit pathname naming the font file */
/* */
/* face_index :: the index of the face within the font file. */
/* The first face has index 0. */
/* <Output> */
/* face :: A handle to a new face object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, see FT_Open_Face below. */
/* */
/* FT_New_Face creates a new stream object. The stream will be */
/* closed with the face (when calling FT_Done_Face or even */
/* FT_Done_FreeType). */
/* */
/* Unlike FreeType 1.1, this function automatically creates a glyph */
/* slot for the face object which can be accessed directly through */
/* `face->slot'. Note that additional slots can be added to each face */
/* through the FT_New_GlyphSlot() API function. Slots are linked in */
/* a single list through their `next' field. */
/* */
FT_EXPORT_DEF(FT_Error) FT_New_Face( FT_Library library,
const char* filepathname,
FT_Long face_index,
FT_Face* face );
/*************************************************************************/
/* */
/* <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> */
/* face :: 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 */
/* `*face'. Its return value should be 0 if the resource is */
/* recognized, or non-zero if not. */
/* */
FT_EXPORT_DEF(FT_Error) FT_New_Memory_Face( FT_Library library,
void* file_base,
FT_Long file_size,
FT_Long face_index,
FT_Face* face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Open_Face */
/* */
/* <Description> */
/* Creates a new face object from a given input stream & typeface */
/* index. This function is very similar to FT_New_Face, except that */
/* it can accept any form of input stream.. */
/* */
/* <Input> */
/* library :: handle to the root FreeType library instance */
/* */
/* args :: an FT_Open_Args structure used to describe the */
/* input stream to FreeType. */
/* */
/* face_index :: the index of the face within the font file. */
/* The first face has index 0. */
/* <Output> */
/* face :: A handle to a new face object. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* Note that if the stream is in-memory or specified through an */
/* 8-bit pathname, a new stream is created by this function. It */
/* is only closed when the face is destroyed (FT_Done_Face). */
/* */
/* Note that when specifying directly an existing FT_Stream, this */
/* function creates a new FT_Stream object and copies the contents */
/* of the original stream within it. The stream will be closed */
/* when the face is destroyed. This means calling the stream's */
/* "close" function. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Open_Face( FT_Library library,
FT_Open_Args* args,
FT_Long face_index,
FT_Face* face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Attach_File */
/* */
/* <Description> */
/* "Attach" a given font file to an existing face. This is usually */
/* to read additionnal 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.. */
/* */
/* <Input> */
/* face :: target face object */
/* */
/* filepathname :: an 8-bit pathname naming the 'metrics' file. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* If your font file is in memory, or if you want to provide your */
/* own input stream object, see FT_Attach_Stream. */
/* */
/* 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're doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments.. */
/* */
FT_EXPORT_DEF(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. */
/* */
/* <Input> */
/* face :: target face object */
/* */
/* args :: a pointer to an FT_Open_Args structure used to describe */
/* the input stream to FreeType */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* 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're doing */
/* when invoking this function. Most drivers simply do not implement */
/* file attachments.. */
/* */
FT_EXPORT_DEF(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> */
/* Error code. 0 means success. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Done_Face( FT_Face face );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Char_Size */
/* */
/* <Description> */
/* Sets the character dimensions of a given size object. The */
/* `char_size' value is used for the width and height, expressed in */
/* 26.6 fractional points. 1 point = 1/72 inch. */
/* */
/* <Input> */
/* size :: A handle to a target size object. */
/* char_size :: The character size, in 26.6 fractional points. */
/* */
/* <Return> */
/* 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_DEF(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 size object. The width */
/* and height are expressed in integer pixels. */
/* */
/* <Input> */
/* size :: A handle to a target size object. */
/* pixel_width :: The character width, in integer pixels. */
/* pixel_height :: The character height, in integer pixels. */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
FT_EXPORT_DEF(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. */
/* */
/* <Input> */
/* face :: A handle to the target face object where the glyph */
/* will be loaded. */
/* */
/* 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. */
/* */
FT_EXPORT_DEF(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 ! */
/* */
/* <Input> */
/* face :: A handle to a target face object where the glyph */
/* will be loaded. */
/* */
/* 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.. */
/* */
FT_EXPORT_DEF(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 when FT_LOAD_NO_SCALE is set. */
/* */
#define FT_LOAD_NO_HINTING 2
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_NO_OUTLINE */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should not load the vector outline of a given glyph. */
/* If an embedded bitmap exists for the glyph in the font, it will be */
/* loaded, otherwise nothing is returned and an error is produced. */
/* */
#define FT_LOAD_NO_OUTLINE 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. If an outline exists for the glyph in the font, it is */
/* loaded, otherwise nothing is returned and an error is produced. */
/* */
#define FT_LOAD_NO_BITMAP 8
/*************************************************************************/
/* */
/* <Constant> */
/* FT_LOAD_LINEAR */
/* */
/* <Description> */
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
/* the function should return the linearly scaled metrics for the */
/* glyph in `slot->metrics2' (these metrics are not grid-fitted). */
/* Otherwise, `metrics2' gives the original font units values. */
/* */
#define FT_LOAD_LINEAR 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_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_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. */
/* */
/* <Output> */
/* kerning :: 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_DEF(FT_Error) FT_Get_Kerning( FT_Face face,
FT_UInt left_glyph,
FT_UInt right_glyph,
FT_Vector* kerning );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Select_Charmap */
/* */
/* <Description> */
/* Selects a given charmap by its encoding tag. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* encoding :: handle to the selected charmap */
/* */
/* <Return> */
/* 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_DEF(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. */
/* */
/* <Input> */
/* face :: A handle to the source face object. */
/* charmap :: handle to the selected charmap */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* this function will return an error when the charmap is not part */
/* of the face (i.e. if it is not listed in the face->charmaps[] */
/* table). */
/* */
FT_EXPORT_DEF(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> */
/* charmap :: A handle to a filter charmap object. */
/* charcode :: The character code. */
/* */
/* <Return> */
/* The glyph index. 0 means `undefined character code'. */
/* */
FT_EXPORT_DEF(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_DEF(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 2.0 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_DEF(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 optimisation for FT_DivFix() is simple : if (a << 16) fits */
/* in 32 bits, then the division is computed directly. Otherwise, */
/* we use a specialised version of the old FT_MulDiv64 */
/* */
FT_EXPORT_DEF(FT_Long) FT_DivFix( FT_Long a,
FT_Long b );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Get_Bitmap */
/* */
/* <Description> */
/* Renders an outline within a bitmap. The outline's image is simply */
/* or-ed to the target bitmap. */
/* */
/* */
/* <Input> */
/* library :: A handle to a FreeType library object. */
/* outline :: A pointer to the source outline descriptor. */
/* map :: A pointer to the target bitmap descriptor. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <MT-Note> */
/* YES. Rendering is synchronized, so that concurrent calls to the */
/* scan-line converter will be serialized. */
/* */
/* <Note> */
/* This function does NOT CREATE the bitmap, it only renders an */
/* outline image within the one you pass to it! */
/* */
/* It will use the raster correponding to the default glyph format. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_Get_Bitmap( FT_Library library,
FT_Outline* outline,
FT_Bitmap* bitmap );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Render */
/* */
/* <Description> */
/* Renders an outline within a bitmap using the current scan-convert */
/* This functions uses a FT_Raster_Params as argument, allowing */
/* advanced features like direct composition/translucency, etc.. */
/* */
/* <Input> */
/* library :: A handle to a FreeType library object. */
/* outline :: A pointer to the source outline descriptor. */
/* params :: A pointer to a FT_Raster_Params used to describe */
/* the rendering operation */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <MT-Note> */
/* YES. Rendering is synchronized, so that concurrent calls to the */
/* scan-line converter will be serialized. */
/* */
/* <Note> */
/* You should know what you're doing and the role of FT_Raster_Params */
/* to use this function. */
/* */
/* the field "params.source" will be set to "outline" before the */
/* scan converter is called, which means that the value you give it */
/* is actually ignored.. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_Render( FT_Library library,
FT_Outline* outline,
FT_Raster_Params* params );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Decompose */
/* */
/* <Description> */
/* Walks over an outline's structure to decompose it into individual */
/* segments and Bezier arcs. This function is also able to emit */
/* `move to' and `close to' operations to indicate the start and end */
/* of new contours in the outline. */
/* */
/* <Input> */
/* outline :: A pointer to the source target. */
/* */
/* funcs :: A table of `emitters', i.e,. function pointers called */
/* during decomposition to indicate path operations. */
/* */
/* user :: A typeless pointer which is passed to each emitter */
/* during the decomposition. It can be used to store */
/* the state during the decomposition. */
/* */
/* <Return> */
/* FreeType error code. 0 means sucess. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_Decompose( FT_Outline* outline,
FT_Outline_Funcs* funcs,
void* user );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_New */
/* */
/* <Description> */
/* Creates a new outline of a given size. */
/* */
/* <Input> */
/* library :: A handle to the library object from where the */
/* outline is allocated. Note however that the new */
/* outline will NOT necessarily be FREED when */
/* destroying the library, by FT_Done_FreeType(). */
/* */
/* numPoints :: The maximal number of points within the outline. */
/* */
/* numContours :: The maximal number of contours within the outline. */
/* */
/* <Output> */
/* outline :: A handle to the new outline. NULL in case of */
/* error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <MT-Note> */
/* No. */
/* */
/* <Note> */
/* The reason why this function takes a `library' parameter is simply */
/* to use the library's memory allocator. You can copy the source */
/* code of this function, replacing allocations with `malloc()' if */
/* you want to control where the objects go. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_New( FT_Library library,
FT_UInt numPoints,
FT_Int numContours,
FT_Outline* outline );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Done */
/* */
/* <Description> */
/* Destroys an outline created with FT_Outline_New(). */
/* */
/* <Input> */
/* library :: A handle of the library object used to allocate the */
/* outline. */
/* */
/* outline :: A pointer to the outline object to be discarded. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <MT-Note> */
/* No. */
/* */
/* <Note> */
/* If the outline's `owner' field is not set, only the outline */
/* descriptor will be released. */
/* */
/* The reason why this function takes an `outline' parameter is */
/* simply to use FT_Alloc()/FT_Free(). You can copy the source code */
/* of this function, replacing allocations with `malloc()' in your */
/* application if you want something simpler. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_Done( FT_Library library,
FT_Outline* outline );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Get_CBox */
/* */
/* <Description> */
/* Returns an outline's `control box'. The control box encloses all */
/* the outline's points, including Bezier control points. Though it */
/* coincides with the exact bounding box for most glyphs, it can be */
/* slightly larger in some situations (like when rotating an outline */
/* which contains Bezier outside arcs). */
/* */
/* Computing the control box is very fast, while getting the bounding */
/* box can take much more time as it needs to walk over all segments */
/* and arcs in the outline. To get the latter, you can use the */
/* `ftbbox' component which is dedicated to this single task. */
/* */
/* <Input> */
/* outline :: A pointer to the source outline descriptor. */
/* */
/* <Output> */
/* cbox :: The outline's control box. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
FT_EXPORT_DEF(void) FT_Outline_Get_CBox( FT_Outline* outline,
FT_BBox* cbox );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Translate */
/* */
/* <Description> */
/* Applies a simple translation to the points of an outline. */
/* */
/* <Input> */
/* outline :: A pointer to the target outline descriptor. */
/* xOffset :: The horizontal offset. */
/* yOffset :: The vertical offset. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
FT_EXPORT_DEF(void) FT_Outline_Translate( FT_Outline* outline,
FT_Pos xOffset,
FT_Pos yOffset );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Raster */
/* */
/* <Description> */
/* Register a given raster to the library. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* raster_funcs :: pointer to the raster's interface */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function will do the following: */
/* */
/* - a new raster object is created through raster_func.raster_new */
/* if this fails, then the function returns */
/* */
/* - if a raster is already registered for the glyph format */
/* specified in raster_funcs, it will be destroyed */
/* */
/* - the new raster is registered for the glyph format */
/* */
FT_EXPORT_DEF(FT_Error) FT_Set_Raster( FT_Library library,
FT_Raster_Funcs* raster_funcs );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Unset_Raster */
/* */
/* <Description> */
/* Removes a given raster from the library. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* raster_funcs :: pointer to the raster's interface */
/* */
/* <Return> */
/* Error code. 0 means success. */
/* */
/* <Note> */
/* This function should never be used by a normal client application */
/* as FT_Set_Raster unregisters the previous raster for a given */
/* glyph format.. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Unset_Raster( FT_Library library,
FT_Raster_Funcs* raster_funcs );
/*************************************************************************
*
* <Function>
* FT_Get_Raster
*
* <Description>
* Return a pointer to the raster corresponding to a given glyph
* format tag.
*
* <Input>
* library :: handle to source library object
* glyph_format :: glyph format tag
*
* <Output>
* raster_funcs :: if this field is not 0, returns a pointer to the
* raster's interface/descriptor..
*
* <Return>
* a pointer to the corresponding raster object.
*
*************************************************************************/
FT_EXPORT_DEF(FT_Raster) FT_Get_Raster( FT_Library library,
FT_Glyph_Format glyph_format,
FT_Raster_Funcs *raster_funcs );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Set_Raster_Mode */
/* */
/* <Description> */
/* Set a raster-specific mode. */
/* */
/* <Input> */
/* library :: A handle to a target library object. */
/* format :: the glyph format used to select the raster */
/* mode :: the raster-specific mode descriptor */
/* args :: the mode arguments */
/* <Return> */
/* Error code. 0 means success. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Set_Raster_Mode( FT_Library library,
FT_Glyph_Format format,
unsigned long mode,
void* args );
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/***** *****/
/***** C O N V E N I E N C E F U N C T I O N S *****/
/***** *****/
/***** *****/
/***** The following functions are provided as a convenience *****/
/***** to client applications. However, their compilation might *****/
/***** be discarded if FT_CONFIG_OPTION_NO_CONVENIENCE_FUNCS *****/
/***** is defined in "config/ftoption.h". *****/
/***** *****/
/***************************************************************************/
/***************************************************************************/
/***************************************************************************/
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Copy */
/* */
/* <Description> */
/* Copies an outline into another one. Both objects must have the */
/* same sizes (number of points & number of contours) when this */
/* function is called. */
/* */
/* <Input> */
/* source :: A handle to the source outline. */
/* target :: A handle to the target outline. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Outline_Copy( FT_Outline* source,
FT_Outline* target );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Transform */
/* */
/* <Description> */
/* Applies a simple 2x2 matrix to all of an outline's points. Useful */
/* for applying rotations, slanting, flipping, etc. */
/* */
/* <Input> */
/* outline :: A pointer to the target outline descriptor. */
/* matrix :: A pointer to the transformation matrix. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
/* <Note> */
/* You can use FT_Outline_Translate() if you need to translate the */
/* outline's points. */
/* */
FT_EXPORT_DEF(void) FT_Outline_Transform( FT_Outline* outline,
FT_Matrix* matrix );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Outline_Reverse */
/* */
/* <Description> */
/* Reverse the drawing direction of an outline. This is used to */
/* ensure consistent fill conventions for mirrored glyphs.. */
/* */
/* <Input> */
/* outline :: A pointer to the target outline descriptor. */
/* */
/* <Note> */
/* This functions toggles the bit flag ft_outline_reverse_fill in */
/* the outline's "flags" field.. */
/* */
/* It shouldn't be used by a normal client application, unless it */
/* knows what it's doing.. */
/* */
FT_EXPORT_DEF(void) FT_Outline_Reverse( FT_Outline* outline );
/*************************************************************************/
/* */
/* <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. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
FT_EXPORT_DEF(void) FT_Vector_Transform( FT_Vector* vector,
FT_Matrix* matrix );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Matrix_Multiply */
/* */
/* <Description> */
/* Performs the matrix operation `b = a*b'. */
/* */
/* <Input> */
/* a :: A pointer to matrix `a'. */
/* */
/* <InOut> */
/* b :: A pointer to matrix `b'. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
FT_EXPORT_DEF(void) FT_Matrix_Multiply( FT_Matrix* a,
FT_Matrix* b );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Matrix_Invert */
/* */
/* <Description> */
/* Inverts a 2x2 matrix. Returns an error if it can't be inverted. */
/* */
/* <InOut> */
/* matrix :: A pointer to the target matrix. Remains untouched in */
/* case of error. */
/* */
/* <Return> */
/* FreeType error code. 0 means success. */
/* */
/* <MT-Note> */
/* Yes. */
/* */
FT_EXPORT_DEF(FT_Error) FT_Matrix_Invert( FT_Matrix* matrix );
/*************************************************************************/
/* */
/* <Function> */
/* FT_Default_Drivers */
/* */
/* <Description> */
/* Adds the set of default drivers to a given library object. */
/* */
/* <InOut> */
/* library :: A handle to a new library object. */
/* */
FT_EXPORT_DEF(void) FT_Default_Drivers( FT_Library library );
#ifdef __cplusplus
}
#endif
#endif /* FREETYPE_H */
/* END */