kc3-lang/freetype/include/freetype.h
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Hash : 1d1c7eb8
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Date : 2000-02-13T13:35:21
small update in FT_Open_Args (more could follow though..)
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include/freetype.h
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/***************************************************************************/ /* */ /* freetype.h */ /* */ /* FreeType high-level API and common types (specification only). */ /* */ /* Copyright 1996-1999 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 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 EXPORT_DEF #define EXPORT_DEF extern #endif #include <fterrors.h> #include <ftsystem.h> #include <ftimage.h> #ifdef __cplusplus extern "C" { #endif /*************************************************************************/ /* */ /* <Type> */ /* FT_Bool */ /* */ /* <Description> */ /* A typedef of unsigned char, used for simple booleans. */ /* */ typedef unsigned char FT_Bool; /*************************************************************************/ /* */ /* <Type> */ /* FT_FWord */ /* */ /* <Description> */ /* A signed 16-bit integer used to store a distance in original font */ /* units. */ /* */ typedef signed short FT_FWord; /* Distance in FUnits */ /*************************************************************************/ /* */ /* <Type> */ /* FT_UFWord */ /* */ /* <Description> */ /* An unsigned 16-bit integer used to store a distance in original */ /* font units. */ /* */ typedef unsigned short FT_UFWord; /* Unsigned distance */ /*************************************************************************/ /* */ /* <Type> */ /* FT_Char */ /* */ /* <Description> */ /* A simple typedef for the _signed_ char type. */ /* */ typedef signed char FT_Char; /*************************************************************************/ /* */ /* <Type> */ /* FT_Byte */ /* */ /* <Description> */ /* A simple typedef for the _unsigned_ char type. */ /* */ typedef unsigned char FT_Byte; /*************************************************************************/ /* */ /* <Type> */ /* FT_String */ /* */ /* <Description> */ /* A simple typedef for the char type, usually used for strings. */ /* */ typedef char FT_String; /*************************************************************************/ /* */ /* <Type> */ /* FT_Short */ /* */ /* <Description> */ /* A typedef for signed short. */ /* */ typedef signed short FT_Short; /*************************************************************************/ /* */ /* <Type> */ /* FT_UShort */ /* */ /* <Description> */ /* A typedef for unsigned short. */ /* */ typedef unsigned short FT_UShort; /*************************************************************************/ /* */ /* <Type> */ /* FT_Int */ /* */ /* <Description> */ /* A typedef for the int type. */ /* */ typedef int FT_Int; /*************************************************************************/ /* */ /* <Type> */ /* FT_UInt */ /* */ /* <Description> */ /* A typedef for the unsigned int type. */ /* */ typedef unsigned int FT_UInt; /*************************************************************************/ /* */ /* <Type> */ /* FT_Long */ /* */ /* <Description> */ /* A typedef for signed long. */ /* */ typedef signed long FT_Long; /*************************************************************************/ /* */ /* <Type> */ /* FT_ULong */ /* */ /* <Description> */ /* A typedef for unsigned long. */ /* */ typedef unsigned long FT_ULong; /*************************************************************************/ /* */ /* <Type> */ /* FT_F2Dot14 */ /* */ /* <Description> */ /* A signed 2.14 fixed float type used for unit vectors. */ /* */ typedef signed short FT_F2Dot14; /*************************************************************************/ /* */ /* <Type> */ /* FT_F26Dot6 */ /* */ /* <Description> */ /* A signed 26.6 fixed float type used for vectorial pixel */ /* coordinates. */ /* */ typedef signed long FT_F26Dot6; /*************************************************************************/ /* */ /* <Type> */ /* FT_Fixed */ /* */ /* <Description> */ /* This type is used to store 16.16 fixed float values, like scales */ /* or matrix coefficients. */ /* */ typedef signed long FT_Fixed; /*************************************************************************/ /* */ /* <Type> */ /* FT_Error */ /* */ /* <Description> */ /* The FreeType error code type. A value of 0 is always interpreted */ /* as a successful operation. */ /* */ typedef int FT_Error; /*************************************************************************/ /* */ /* <Struct> */ /* FT_UnitVector */ /* */ /* <Description> */ /* A simple structure used to store a 2d vector unit vector. Uses */ /* FT_F2Dot14 types. */ /* */ /* <Fields> */ /* x :: Horizontal coordinate. */ /* y :: Vertical coordinate. */ /* */ typedef struct FT_UnitVector_ { FT_F2Dot14 x; FT_F2Dot14 y; } FT_UnitVector; /*************************************************************************/ /* */ /* <Struct> */ /* FT_Matrix */ /* */ /* <Description> */ /* A simple structure used to store a 2x2 matrix. Coefficients are */ /* in 16.16 fixed float format. The computation performed is: */ /* */ /* { */ /* x' = x*xx + y*xy */ /* y' = x*yx + y*yy */ /* } */ /* */ /* <Fields> */ /* xx :: Matrix coefficient. */ /* xy :: Matrix coefficient. */ /* yx :: Matrix coefficient. */ /* yy :: Matrix coefficient. */ /* */ typedef struct FT_Matrix_ { FT_Fixed xx, xy; FT_Fixed yx, yy; } FT_Matrix; /*************************************************************************/ /* */ /* <Struct> */ /* FT_BBox */ /* */ /* <Description> */ /* A structure used to hold an outline's bounding box, i.e., the */ /* coordinates of its extrema in the horizontal and vertical */ /* directions. */ /* */ /* <Fields> */ /* xMin :: The horizontal minimum (left-most). */ /* yMin :: The vertical minimum (bottom-most). */ /* xMax :: The horizontal maximum (right-most). */ /* yMax :: The vertical maximum (top-most). */ /* */ typedef struct FT_BBox_ { FT_Pos xMin, yMin; FT_Pos xMax, yMax; } FT_BBox; /*************************************************************************/ /* */ /* <Macro> */ /* FT_MAKE_TAG */ /* */ /* <Description> */ /* This macro converts four letter tags which are used to label */ /* TrueType tables into an unsigned long to be used within FreeType. */ /* */ #define FT_MAKE_TAG( _x1, _x2, _x3, _x4 ) \ (((FT_ULong)_x1 << 24) | \ ((FT_ULong)_x2 << 16) | \ ((FT_ULong)_x3 << 8) | \ (FT_ULong)_x4) /*************************************************************************/ /*************************************************************************/ /* */ /* L I S T M A N A G E M E N T */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Type> */ /* FT_ListNode */ /* */ /* <Description> */ /* Many elements and objects in FreeType are listed through a */ /* FT_List record (see FT_ListRec). As its name suggests, a */ /* FT_ListNode is a handle to a single list element. */ /* */ typedef struct FT_ListNodeRec_* FT_ListNode; /*************************************************************************/ /* */ /* <Type> */ /* FT_List */ /* */ /* <Description> */ /* A handle to a list record (see FT_ListRec). */ /* */ typedef struct FT_ListRec_* FT_List; /*************************************************************************/ /* */ /* <Struct> */ /* FT_ListNodeRec */ /* */ /* <Description> */ /* A structure used to hold a single list element. */ /* */ /* <Fields> */ /* prev :: Previous element in the list. NULL if first. */ /* next :: Next element in the list. NULL if last. */ /* data :: Typeless pointer to the listed object. */ /* */ typedef struct FT_ListNodeRec_ { FT_ListNode prev; FT_ListNode next; void* data; } FT_ListNodeRec; /*************************************************************************/ /* */ /* <Struct> */ /* FT_ListRec */ /* */ /* <Description> */ /* A structure used to hold a simple doubly-linked list. These are */ /* used in many parts of FreeType. */ /* */ /* <Fields> */ /* head :: Head (first element) of doubly-linked list. */ /* tail :: Tail (last element) of doubly-linked list. */ /* */ typedef struct FT_ListRec_ { FT_ListNode head; FT_ListNode tail; } FT_ListRec; #define FT_IS_EMPTY(list) ( (list).head == 0 ) /*************************************************************************/ /*************************************************************************/ /* */ /* 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> */ /* 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. */ /* */ /* 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). */ /* */ /* generic :: A field reserved for client uses. See the */ /* FT_Generic type description. */ /* */ /* 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. */ /* */ /* 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. */ /* */ /* num_charmaps :: The total number of character maps 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. */ /* */ /* 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 maximum glyph width is given by */ /* `bbox.xMax-bbox.xMin' (not to be confused */ /* with the maximum _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 maximum advance width, in font units, */ /* for all glyphs in this face. This can be */ /* used to make word wrapping computations */ /* faster. Only relevant for scalable */ /* formats. */ /* */ /* max_advance_height :: The maximum advance height, in font units, */ /* for all glyphs in this face. This is only */ /* relevant for vertical layouts, and 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. */ /* */ /* max_points :: The maximum 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 maximum 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. */ /* */ typedef struct FT_FaceRec_ { FT_Driver driver; FT_Memory memory; FT_Stream stream; FT_Long num_faces; FT_Long face_index; /* a generic pointer for client use */ FT_Generic generic; /* the face's current glyph slot(s) */ FT_GlyphSlot glyph; /* the face's current size, may be nil */ FT_Size size; /* the face's current charmap */ FT_CharMap charmap; /* the face's table of available charmaps */ FT_Int num_charmaps; FT_CharMap* charmaps; /* the face's current sizes list */ FT_ListRec sizes_list; /* a pointer to the face's extensions block, if supported */ void* extensions; 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 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; FT_UShort max_points; FT_Short max_contours; } 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, 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 #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) /*************************************************************************/ /* */ /* <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> */ /* This structure doesn't return the vertical ascender, descender, */ /* and height, as well as a few other esoteric properties. One can */ /* however compute these through the size's x_scale and y_scale, */ /* applied to the relevant face properties. */ /* */ 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 can be used to return alternate glyph */ /* metrics after a single load. It can contain either */ /* the glyph's metrics in font units, or the scaled but */ /* unhinted ones. See the load flags that apply when */ /* calling the API function FT_Load_Glyph(). */ /* */ /* 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(). */ /* */ /* */ typedef struct FT_GlyphSlotRec_ { FT_Face face; FT_GlyphSlot next; FT_Glyph_Metrics metrics; FT_Glyph_Metrics metrics2; FT_Glyph_Tag format; FT_Bitmap bitmap; FT_Outline outline; FT_Int num_subglyphs; FT_Int max_subglyphs; FT_SubGlyph* subglyphs; void* control_data; void* 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. */ /* */ 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. */ /* */ EXPORT_DEF FT_Error FT_Done_FreeType( FT_Library library ); /************************************************************************* * * <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> * 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. * * <Note> * Here's how a new input stream is built from a FT_Open_Args * structure: * * a/ if 'memory_base' and 'memory_size' are non-null, create a * memory-based stream from the indicated address and length. * * b/ Otherwise, if 'pathname' is non NULL, use it to build a * new system-specific stream (by calling FT_New_Stream) * * c/ Otherwise, if 'stream' is non NULL, use it to access the * font file (note that a new FT_Stream object will be created * where the contents of 'stream' will be copied). * *************************************************************************/ typedef struct FT_Open_Args_ { FT_Byte* memory_base; FT_Long memory_size; FT_String* pathname; FT_Stream stream; FT_Driver driver; } 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. */ /* */ EXPORT_DEF FT_Error FT_New_Face( FT_Library library, const char* filepathname, 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. */ /* */ 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.. */ /* */ 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.. */ /* */ 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. */ /* */ EXPORT_DEF FT_Error FT_Done_Face( FT_Face face ); /*************************************************************************/ /* */ /* <Function> */ /* FT_New_Size */ /* */ /* <Description> */ /* Creates a new size object from a given face object. */ /* */ /* <Input> */ /* face :: A handle to a parent face object. */ /* */ /* <Output> */ /* size :: A handle to a new size object. */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ EXPORT_DEF FT_Error FT_New_Size( FT_Face face, FT_Size* size ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_Size */ /* */ /* <Description> */ /* Discards a given size object. */ /* */ /* <Input> */ /* size :: A handle to a target size object */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ EXPORT_DEF FT_Error FT_Done_Size( FT_Size size ); /*************************************************************************/ /* */ /* <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(). */ /* */ 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. */ /* */ EXPORT_DEF FT_Error FT_Set_Pixel_Sizes( FT_Face face, FT_UInt pixel_width, FT_UInt pixel_height ); /*************************************************************************/ /* */ /* <Function> */ /* FT_New_GlyphSlot */ /* */ /* <Description> */ /* It is sometimes useful to have more than one glyph slot for a */ /* given face object. This function is used to create additional */ /* slots. All of them are automatically discarded when the face is */ /* destroyed. */ /* */ /* <Input> */ /* face :: A handle to a parent face object. */ /* */ /* <Output> */ /* slot :: A handle to a new glyph slot object. */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ EXPORT_DEF FT_Error FT_New_GlyphSlot( FT_Face face, FT_GlyphSlot* aslot ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_GlyphSlot */ /* */ /* <Description> */ /* Destroys a given glyph slot. Remember however that all slots are */ /* automatically destroyed with its parent. Using this function is */ /* not always mandatory. */ /* */ /* <Input> */ /* slot :: A handle to a target glyph slot. */ /* */ EXPORT_DEF void FT_Done_GlyphSlot( FT_GlyphSlot slot ); /*************************************************************************/ /* */ /* <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. */ /* */ 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.. */ /* */ 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_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. */ /* */ /* XXXXX : IMPORTANT NOTE, THIS FLAG IS NOT YET IMPLEMENTED !! */ /* */ #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_Glyph_Bitmap */ /* */ /* <Description> */ /* Renders a given glyph into a bitmap or pixmap. This function will */ /* use the registered rasters to render the glyph image. */ /* */ /* <Input> */ /* face :: handle to the face object whose glyph slot contains */ /* the glyph image */ /* 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 a */ /* glyph image into it! */ /* */ EXPORT_DEF FT_Error FT_Get_Glyph_Bitmap( FT_Face face, FT_Bitmap* map ); /*************************************************************************/ /* */ /* <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. */ /* */ EXPORT_DEF FT_Error FT_Get_Kerning( FT_Face face, FT_UInt left_glyph, FT_UInt right_glyph, FT_Vector* kerning ); /* XXX : Not implemented yet, but should come soon */ #if 0 EXPORT_DEF FT_Error FT_Select_Charmap( FT_Face face, FT_Encoding encoding ); EXPORT_DEF FT_Error FT_Set_Charmap( FT_Face face, FT_CharMap charmap ); #endif /*************************************************************************/ /* */ /* <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'. */ /* */ 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 maximum 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'. */ /* */ 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 maximum 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. */ /* */ 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 maximum 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 */ /* */ EXPORT_DEF FT_Long FT_DivFix( FT_Long a, FT_Long b ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Decompose_Outline */ /* */ /* <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. */ /* */ /* interface :: 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> */ /* Error code. 0 means sucess. */ /* */ EXPORT_DEF int FT_Decompose_Outline( FT_Outline* outline, FT_Outline_Funcs* interface, void* user ); /*************************************************************************/ /* */ /* <Function> */ /* FT_New_Outline */ /* */ /* <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 maximum number of points within the outline. */ /* */ /* numContours :: The maximum 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. */ /* */ EXPORT_DEF FT_Error FT_New_Outline( FT_Library library, FT_UInt numPoints, FT_Int numContours, FT_Outline* outline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_Outline */ /* */ /* <Description> */ /* Destroys an outline created with FT_New_Outline(). */ /* */ /* <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. */ /* */ EXPORT_DEF FT_Error FT_Done_Outline( FT_Library library, FT_Outline* outline ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Outline_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. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <MT-Note> */ /* Yes. */ /* */ EXPORT_DEF FT_Error FT_Get_Outline_CBox( FT_Outline* outline, FT_BBox* cbox ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Translate_Outline */ /* */ /* <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. */ /* */ EXPORT_DEF void FT_Translate_Outline( 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. */ /* */ /* interface :: pointer to the raster's interface */ /* */ /* raster :: if this field is nil, this function will allocate */ /* a new objet. Otherwise, it will simply use the one */ /* provided here. */ /* <Return> */ /* Error code. 0 means success. */ /* */ /* <Return> */ /* Error code. 0 means success. */ /* */ EXPORT_DEF FT_Error FT_Set_Raster( FT_Library library, FT_Raster_Interface* interface, FT_Raster raster ); /*************************************************************************/ /* */ /* <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. */ /* */ EXPORT_DEF FT_Error FT_Set_Raster_Mode( FT_Library library, FT_Glyph_Tag format, const char* mode, const char* args ); #ifdef __cplusplus } #endif #endif /* FREETYPE_H */ /* END */