kc3-lang/freetype/include/freetype/freetype.h
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Hash : 0d535112
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Date : 2001-12-19T22:26:12
Formatting. CFF encoding tables moved back from cffload.c to cffload.h.
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include/freetype/freetype.h
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/***************************************************************************/ /* */ /* freetype.h */ /* */ /* FreeType high-level API and common types (specification only). */ /* */ /* Copyright 1996-2001 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. */ /* */ /*************************************************************************/ /* */ /* The FREETYPE_MAJOR and FREETYPE_MINOR macros are used to version the */ /* new FreeType design, which is able to host several kinds of font */ /* drivers. It starts at 2.0. */ /* */ #define FREETYPE_MAJOR 2 #define FREETYPE_MINOR 0 #define FREETYPE_PATCH 5 #include <ft2build.h> #include FT_CONFIG_CONFIG_H #include FT_ERRORS_H #include FT_TYPES_H FT_BEGIN_HEADER /*************************************************************************/ /*************************************************************************/ /* */ /* B A S I C T Y P E S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Section> */ /* base_interface */ /* */ /* <Title> */ /* Base Interface */ /* */ /* <Abstract> */ /* The FreeType 2 base font interface. */ /* */ /* <Description> */ /* This section describes the public high-level API of FreeType 2. */ /* */ /* <Order> */ /* FT_Library */ /* FT_Face */ /* FT_Size */ /* FT_GlyphSlot */ /* FT_CharMap */ /* FT_Encoding */ /* */ /* FT_FaceRec */ /* */ /* FT_FACE_FLAG_SCALABLE */ /* FT_FACE_FLAG_FIXED_SIZES */ /* FT_FACE_FLAG_FIXED_WIDTH */ /* FT_FACE_FLAG_HORIZONTAL */ /* FT_FACE_FLAG_VERTICAL */ /* FT_FACE_FLAG_SFNT */ /* FT_FACE_FLAG_KERNING */ /* FT_FACE_FLAG_MULTIPLE_MASTERS */ /* FT_FACE_FLAG_GLYPH_NAMES */ /* FT_FACE_FLAG_EXTERNAL_STREAM */ /* FT_FACE_FLAG_FAST_GLYPHS */ /* */ /* FT_STYLE_FLAG_BOLD */ /* FT_STYLE_FLAG_ITALIC */ /* */ /* FT_SizeRec */ /* FT_Size_Metrics */ /* */ /* FT_GlyphSlotRec */ /* FT_Glyph_Metrics */ /* FT_SubGlyph */ /* */ /* FT_Bitmap_Size */ /* */ /* FT_Init_FreeType */ /* FT_Done_FreeType */ /* */ /* FT_New_Face */ /* FT_Done_Face */ /* FT_New_Memory_Face */ /* FT_Open_Face */ /* FT_Open_Args */ /* FT_Open_Flags */ /* FT_Parameter */ /* FT_Attach_File */ /* FT_Attach_Stream */ /* */ /* FT_Set_Char_Size */ /* FT_Set_Pixel_Sizes */ /* FT_Set_Transform */ /* FT_Load_Glyph */ /* FT_Get_Char_Index */ /* FT_Get_Name_Index */ /* FT_Load_Char */ /* */ /* FT_LOAD_DEFAULT */ /* FT_LOAD_RENDER */ /* FT_LOAD_MONOCHROME */ /* FT_LOAD_LINEAR_DESIGN */ /* FT_LOAD_NO_SCALE */ /* FT_LOAD_NO_HINTING */ /* FT_LOAD_NO_BITMAP */ /* FT_LOAD_CROP_BITMAP */ /* */ /* FT_LOAD_VERTICAL_LAYOUT */ /* FT_LOAD_IGNORE_TRANSFORM */ /* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */ /* FT_LOAD_FORCE_AUTOHINT */ /* FT_LOAD_NO_RECURSE */ /* FT_LOAD_PEDANTIC */ /* */ /* FT_Render_Glyph */ /* FT_Render_Mode */ /* FT_Get_Kerning */ /* FT_Kerning_Mode */ /* FT_Get_Glyph_Name */ /* FT_Get_Postscript_Name */ /* */ /* FT_CharMapRec */ /* FT_Select_Charmap */ /* FT_Set_Charmap */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <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; /*************************************************************************/ /* */ /* <Struct> */ /* FT_Bitmap_Size */ /* */ /* <Description> */ /* An extremely simple structure used to model the size of a bitmap */ /* strike (i.e., a bitmap instance of the font for a given */ /* resolution) in a fixed-size font face. This is used for the */ /* `available_sizes' field of the FT_Face_Properties structure. */ /* */ /* <Fields> */ /* height :: The character height in pixels. */ /* */ /* width :: The character width in pixels. */ /* */ typedef struct FT_Bitmap_Size_ { FT_Short height; FT_Short width; } FT_Bitmap_Size; /*************************************************************************/ /*************************************************************************/ /* */ /* O B J E C T C L A S S E S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Type> */ /* FT_Library */ /* */ /* <Description> */ /* A handle to a FreeType library instance. Each `library' is */ /* completely independent from the others; it is the `root' of a set */ /* of objects like fonts, faces, sizes, etc. */ /* */ /* It also embeds a system object (see FT_System), as well as a */ /* scan-line converter object (see FT_Raster). */ /* */ /* <Note> */ /* Library objects are created through FT_Init_FreeType(). */ /* */ typedef struct FT_LibraryRec_ *FT_Library; /*************************************************************************/ /* */ /* <Type> */ /* FT_Module */ /* */ /* <Description> */ /* A handle to a given FreeType module object. Each module can be a */ /* font driver, a renderer, or anything else that provides services */ /* to the formers. */ /* */ typedef struct FT_ModuleRec_* FT_Module; /*************************************************************************/ /* */ /* <Type> */ /* FT_Driver */ /* */ /* <Description> */ /* A handle to a given FreeType font driver object. Each font driver */ /* is able to create faces, sizes, glyph slots, and charmaps from the */ /* resources whose format it supports. */ /* */ /* A driver can support either bitmap, graymap, or scalable font */ /* formats. */ /* */ typedef struct FT_DriverRec_* FT_Driver; /*************************************************************************/ /* */ /* <Type> */ /* FT_Renderer */ /* */ /* <Description> */ /* A handle to a given FreeType renderer. A renderer is in charge of */ /* converting a glyph image to a bitmap, when necessary. Each */ /* supports a given glyph image format, and one or more target */ /* surface depths. */ /* */ typedef struct FT_RendererRec_* FT_Renderer; /*************************************************************************/ /* */ /* <Type> */ /* FT_Face */ /* */ /* <Description> */ /* A handle to a given driver face object. A face object contains */ /* all the instance and glyph independent data of a font file */ /* typeface. */ /* */ /* A face object is created from a resource object through the */ /* new_face() method of a given driver. */ /* */ typedef struct FT_FaceRec_* FT_Face; /*************************************************************************/ /* */ /* <Type> */ /* FT_Size */ /* */ /* <Description> */ /* A handle to a given driver size object. Such an object models the */ /* _resolution_ AND _size_ dependent state of a given driver face */ /* size. */ /* */ /* A size object is always created from a given face object. It is */ /* discarded automatically by its parent face. */ /* */ typedef struct FT_SizeRec_* FT_Size; /*************************************************************************/ /* */ /* <Type> */ /* FT_GlyphSlot */ /* */ /* <Description> */ /* A handle to a given `glyph slot'. A slot is a container where it */ /* is possible to load any of the glyphs contained within its parent */ /* face. */ /* */ /* A glyph slot is created from a given face object. It is discarded */ /* automatically by its parent face. */ /* */ typedef struct FT_GlyphSlotRec_* FT_GlyphSlot; /*************************************************************************/ /* */ /* <Type> */ /* FT_CharMap */ /* */ /* <Description> */ /* A handle to a given character map. A charmap is used to translate */ /* character codes in a given encoding into glyph indexes for its */ /* parent's face. Some font formats may provide several charmaps per */ /* font. */ /* */ /* A charmap is created from a given face object. It is discarded */ /* automatically by its parent face. */ /* */ typedef struct FT_CharMapRec_* FT_CharMap; /*************************************************************************/ /* */ /* <Macro> */ /* FT_ENC_TAG */ /* */ /* <Description> */ /* This macro converts four letter tags into an unsigned long. */ /* */ #ifndef FT_ENC_TAG #define FT_ENC_TAG( value, _x1, _x2, _x3, _x4 ) \ value = ( ( (unsigned long)_x1 << 24 ) | \ ( (unsigned long)_x2 << 16 ) | \ ( (unsigned long)_x3 << 8 ) | \ (unsigned long)_x4 ) #endif /* FT_ENC_TAG */ /*************************************************************************/ /* */ /* <Enum> */ /* FT_Encoding */ /* */ /* <Description> */ /* An enumeration used to specify encodings supported by charmaps. */ /* Used in the FT_Select_Charmap() API function. */ /* */ /* <Note> */ /* Because of 32-bit charcodes defined in Unicode (i.e., surrogates), */ /* all character codes must be expressed as FT_Longs. */ /* */ /* Other encodings might be defined in the future. */ /* */ typedef enum FT_Encoding_ { FT_ENC_TAG( ft_encoding_none, 0, 0, 0, 0 ), FT_ENC_TAG( ft_encoding_symbol, 's', 'y', 'm', 'b' ), FT_ENC_TAG( ft_encoding_unicode, 'u', 'n', 'i', 'c' ), FT_ENC_TAG( ft_encoding_latin_2, 'l', 'a', 't', '2' ), FT_ENC_TAG( ft_encoding_sjis, 's', 'j', 'i', 's' ), FT_ENC_TAG( ft_encoding_gb2312, 'g', 'b', ' ', ' ' ), FT_ENC_TAG( ft_encoding_big5, 'b', 'i', 'g', '5' ), FT_ENC_TAG( ft_encoding_wansung, 'w', 'a', 'n', 's' ), FT_ENC_TAG( ft_encoding_johab, 'j', 'o', 'h', 'a' ), FT_ENC_TAG( ft_encoding_adobe_standard, 'A', 'D', 'O', 'B' ), FT_ENC_TAG( ft_encoding_adobe_expert, 'A', 'D', 'B', 'E' ), FT_ENC_TAG( ft_encoding_adobe_custom, 'A', 'D', 'B', 'C' ), FT_ENC_TAG( ft_encoding_apple_roman, 'a', 'r', 'm', 'n' ) } FT_Encoding; /*************************************************************************/ /* */ /* <Struct> */ /* FT_CharMapRec */ /* */ /* <Description> */ /* The base charmap class. */ /* */ /* <Fields> */ /* face :: A handle to the parent face object. */ /* */ /* encoding :: A tag which identifies the charmap. Use this with */ /* FT_Select_Charmap(). */ /* */ /* platform_id :: An ID number describing the platform for the */ /* following encoding ID. This comes directly from */ /* the TrueType specification and should be emulated */ /* for other formats. */ /* */ /* encoding_id :: A platform specific encoding number. This also */ /* comes from the TrueType specification and should be */ /* emulated similarly. */ /* */ /* <Note> */ /* We STRONGLY recommmend emulating a Unicode charmap for drivers */ /* that do not support TrueType or OpenType. */ /* */ typedef struct FT_CharMapRec_ { FT_Face face; FT_Encoding encoding; FT_UShort platform_id; FT_UShort encoding_id; } FT_CharMapRec; /*************************************************************************/ /*************************************************************************/ /* */ /* B A S E O B J E C T C L A S S E S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Type> */ /* FT_Face_Internal */ /* */ /* <Description> */ /* An opaque handle to an FT_Face_InternalRec structure, used to */ /* model private data of a given FT_Face object. */ /* */ /* This field might change between releases of FreeType 2 and are */ /* not generally available to client applications. */ /* */ typedef struct FT_Face_InternalRec_* FT_Face_Internal; /*************************************************************************/ /* */ /* FreeType base face class */ /* */ /* <Struct> */ /* FT_FaceRec */ /* */ /* <Description> */ /* FreeType root face class structure. A face object models the */ /* resolution and point-size independent data found in a font file. */ /* */ /* <Fields> */ /* num_faces :: In the case where the face is located in a */ /* collection (i.e., a resource which embeds */ /* several faces), this is the total number of */ /* faces found in the resource. 1 by default. */ /* */ /* face_index :: The index of the face in its resource. */ /* Usually, this is 0 for all normal font */ /* formats. It can be more in the case of */ /* collections (which embed several fonts in a */ /* single resource/file). */ /* */ /* face_flags :: A set of bit flags that give important */ /* information about the face; see the */ /* FT_FACE_FLAG_XXX macros for details. */ /* */ /* style_flags :: A set of bit flags indicating the style of */ /* the face (i.e., italic, bold, underline, */ /* etc). */ /* */ /* num_glyphs :: The total number of glyphs in the face. */ /* */ /* family_name :: The face's family name. This is an ASCII */ /* string, usually in English, which describes */ /* the typeface's family (like `Times New */ /* Roman', `Bodoni', `Garamond', etc). This */ /* is a least common denominator used to list */ /* fonts. Some formats (TrueType & OpenType) */ /* provide localized and Unicode versions of */ /* this string. Applications should use the */ /* format specific interface to access them. */ /* */ /* style_name :: The face's style name. This is an ASCII */ /* string, usually in English, which describes */ /* the typeface's style (like `Italic', */ /* `Bold', `Condensed', etc). Not all font */ /* formats provide a style name, so this field */ /* is optional, and can be set to NULL. As */ /* for `family_name', some formats provide */ /* localized/Unicode versions of this string. */ /* Applications should use the format specific */ /* interface to access them. */ /* */ /* num_fixed_sizes :: The number of fixed sizes available in this */ /* face. This should be set to 0 for scalable */ /* fonts, unless its resource includes a */ /* complete set of glyphs (called a `strike') */ /* for the specified size. */ /* */ /* available_sizes :: An array of sizes specifying the available */ /* bitmap/graymap sizes that are contained in */ /* in the font resource. Should be set to */ /* NULL if the field `num_fixed_sizes' is set */ /* to 0. */ /* */ /* num_charmaps :: The total number of character maps in the */ /* face. */ /* */ /* charmaps :: A table of pointers to the face's charmaps. */ /* Used to scan the list of available charmaps */ /* -- this table might change after a call to */ /* FT_Attach_File/Stream (e.g. when used to */ /* hook an additional encoding/CMap to the */ /* face object). */ /* */ /* generic :: A field reserved for client uses. See the */ /* FT_Generic type description. */ /* */ /* bbox :: The font bounding box. Coordinates are */ /* expressed in font units (see units_per_EM). */ /* The box is large enough to contain any */ /* glyph from the font. Thus, bbox.yMax can */ /* be seen as the `maximal ascender', */ /* bbox.yMin as the `minimal descender', and */ /* the maximal glyph width is given by */ /* `bbox.xMax-bbox.xMin' (not to be confused */ /* with the maximal _advance_width_). Only */ /* relevant for scalable formats. */ /* */ /* units_per_EM :: The number of font units per EM square for */ /* this face. This is typically 2048 for */ /* TrueType fonts, 1000 for Type1 fonts, and */ /* should be set to the (unrealistic) value 1 */ /* for fixed-sizes fonts. Only relevant for */ /* scalable formats. */ /* */ /* ascender :: The face's ascender is the vertical */ /* distance from the baseline to the topmost */ /* point of any glyph in the face. This */ /* field's value is positive, expressed in */ /* font units. Some font designs use a value */ /* different from `bbox.yMax'. Only relevant */ /* for scalable formats. */ /* */ /* descender :: The face's descender is the vertical */ /* distance from the baseline to the */ /* bottommost point of any glyph in the face. */ /* This field's value is positive, expressed */ /* in font units. Some font designs use a */ /* value different from `-bbox.yMin'. Only */ /* relevant for scalable formats. */ /* */ /* height :: The face's height is the vertical distance */ /* from one baseline to the next when writing */ /* several lines of text. Its value is always */ /* positive, expressed in font units. The */ /* value can be computed as */ /* `ascender+descender+line_gap' where the */ /* value of `line_gap' is also called */ /* `external leading'. Only relevant for */ /* scalable formats. */ /* */ /* max_advance_width :: The maximal advance width, in font units, */ /* for all glyphs in this face. This can be */ /* used to make word wrapping computations */ /* faster. Only relevant for scalable */ /* formats. */ /* */ /* max_advance_height :: The maximal advance height, in font units, */ /* for all glyphs in this face. This is only */ /* relevant for vertical layouts, and should */ /* be set to the `height' for fonts that do */ /* not provide vertical metrics. Only */ /* relevant for scalable formats. */ /* */ /* underline_position :: The position, in font units, of the */ /* underline line for this face. It's the */ /* center of the underlining stem. Only */ /* relevant for scalable formats. */ /* */ /* underline_thickness :: The thickness, in font units, of the */ /* underline for this face. Only relevant for */ /* scalable formats. */ /* */ /* driver :: A handle to the face's parent driver */ /* object. */ /* */ /* memory :: A handle to the face's parent memory */ /* object. Used for the allocation of */ /* subsequent objects. */ /* */ /* stream :: A handle to the face's stream. */ /* */ /* glyph :: The face's associated glyph slot(s). This */ /* object is created automatically with a new */ /* face object. However, certain kinds of */ /* applications (mainly tools like converters) */ /* can need more than one slot to ease their */ /* task. */ /* */ /* sizes_list :: The list of child sizes for this face. */ /* */ /* internal :: A pointer to internal fields of the face */ /* object. These fields can change freely */ /* between releases of FreeType and are not */ /* publicly available. */ /* */ typedef struct FT_FaceRec_ { FT_Long num_faces; FT_Long face_index; FT_Long face_flags; FT_Long style_flags; FT_Long num_glyphs; FT_String* family_name; FT_String* style_name; FT_Int num_fixed_sizes; FT_Bitmap_Size* available_sizes; FT_Int num_charmaps; FT_CharMap* charmaps; FT_Generic generic; /*# the following are only relevant to scalable outlines */ FT_BBox bbox; FT_UShort units_per_EM; FT_Short ascender; FT_Short descender; FT_Short height; FT_Short max_advance_width; FT_Short max_advance_height; FT_Short underline_position; FT_Short underline_thickness; FT_GlyphSlot glyph; FT_Size size; FT_CharMap charmap; /*@private begin */ FT_Driver driver; FT_Memory memory; FT_Stream stream; FT_ListRec sizes_list; FT_Generic autohint; void* extensions; FT_Face_Internal internal; /*@private end */ } FT_FaceRec; /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_SCALABLE */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face provides */ /* vectorial outlines (i.e., TrueType or Type1). This doesn't */ /* prevent embedding of bitmap strikes though, i.e., a given face can */ /* have both this bit set, and a `num_fixed_sizes' property > 0. */ /* */ #define FT_FACE_FLAG_SCALABLE 1 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_FIXED_SIZES */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face contains */ /* `fixed sizes', i.e., bitmap strikes for some given pixel sizes. */ /* See the `num_fixed_sizes' and `available_sizes' face properties */ /* for more information. */ /* */ #define FT_FACE_FLAG_FIXED_SIZES 2 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_FIXED_WIDTH */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face contains */ /* fixed-width characters (like Courier, Lucida, MonoType, etc.). */ /* */ #define FT_FACE_FLAG_FIXED_WIDTH 4 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_SFNT */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face uses the */ /* `sfnt' storage fomat. For now, this means TrueType or OpenType. */ /* */ #define FT_FACE_FLAG_SFNT 8 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_HORIZONTAL */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face contains */ /* horizontal glyph metrics. This should be set for all common */ /* formats, but who knows. */ /* */ #define FT_FACE_FLAG_HORIZONTAL 0x10 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_VERTICAL */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face contains */ /* vertical glyph metrics. If not set, the glyph loader will */ /* synthetize vertical metrics itself to help display vertical text */ /* correctly. */ /* */ #define FT_FACE_FLAG_VERTICAL 0x20 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_KERNING */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face contains */ /* kerning information. When set, this information can be retrieved */ /* through the function FT_Get_Kerning(). Note that when unset, this */ /* function will always return the kerning vector (0,0). */ /* */ #define FT_FACE_FLAG_KERNING 0x40 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_FAST_GLYPHS */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that the glyphs in a given */ /* font can be retrieved very quickly, and that a glyph cache is thus */ /* not necessary for any of its child size objects. */ /* */ /* This flag should really be set for fixed-size formats like FNT, */ /* where each glyph bitmap is available directly in binary form */ /* without any kind of compression. */ /* */ #define FT_FACE_FLAG_FAST_GLYPHS 0x80 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_MULTIPLE_MASTERS */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that the font contains */ /* multiple masters and is capable of interpolating between them. */ /* */ #define FT_FACE_FLAG_MULTIPLE_MASTERS 0x100 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_GLYPH_NAMES */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that the font contains */ /* glyph names that can be retrieved through FT_Get_Glyph_Name(). */ /* */ #define FT_FACE_FLAG_GLYPH_NAMES 0x200 /*************************************************************************/ /* */ /* <Constant> */ /* FT_FACE_FLAG_EXTERNAL_STREAM */ /* */ /* <Description> */ /* This bit field is used internally by FreeType to indicate that */ /* a face's stream was provided by the client application and should */ /* not be destroyed by FT_Done_Face(). */ /* */ #define FT_FACE_FLAG_EXTERNAL_STREAM 0x4000 /* */ /*************************************************************************/ /* */ /* @macro: FT_HAS_HORIZONTAL (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains */ /* horizontal metrics (this is true for all font formats though). */ /* */ /* @also: */ /* @FT_HAS_VERTICAL can be used to check for vertical metrics. */ /* */ #define FT_HAS_HORIZONTAL( face ) \ ( face->face_flags & FT_FACE_FLAG_HORIZONTAL ) /*************************************************************************/ /* */ /* @macro: FT_HAS_VERTICAL (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains vertical */ /* metrics. */ /* */ #define FT_HAS_VERTICAL( face ) \ ( face->face_flags & FT_FACE_FLAG_VERTICAL ) /*************************************************************************/ /* */ /* @macro: FT_HAS_KERNING (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains kerning */ /* data that can be accessed with @FT_Get_Kerning. */ /* */ #define FT_HAS_KERNING( face ) \ ( face->face_flags & FT_FACE_FLAG_KERNING ) /*************************************************************************/ /* */ /* @macro: FT_IS_SCALABLE (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains a */ /* scalable font face (true for TrueType, Type 1, CID, and */ /* OpenType/CFF font formats. */ /* */ #define FT_IS_SCALABLE( face ) \ ( face->face_flags & FT_FACE_FLAG_SCALABLE ) /*************************************************************************/ /* */ /* @macro: FT_IS_SFNT (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains a font */ /* whose format is based on the SFNT storage scheme. This usually */ /* means: TrueType fonts, OpenType fonts, as well as SFNT-based */ /* embedded bitmap fonts. */ /* */ /* If this macro is true, all functions defined in @FT_SFNT_NAMES_H */ /* and @FT_TRUETYPE_TABLES_H are available. */ /* */ #define FT_IS_SFNT( face ) \ ( face->face_flags & FT_FACE_FLAG_SFNT ) /*************************************************************************/ /* */ /* @macro: FT_IS_FIXED_WIDTH (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains a font */ /* face that contains fixed-width (or "monospace", "fixed-pitch", */ /* etc.) glyphs. */ /* */ #define FT_IS_FIXED_WIDTH( face ) \ ( face->face_flags & FT_FACE_FLAG_FIXED_WIDTH ) /*************************************************************************/ /* */ /* @macro: FT_IS_FIXED_SIZES (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains some */ /* embedded bitmaps. See the `fixed_sizes' field of the @FT_FaceRec */ /* structure. */ /* */ #define FT_HAS_FIXED_SIZES( face ) \ ( face->face_flags & FT_FACE_FLAG_FIXED_SIZES ) /* */ /*************************************************************************/ /* */ /* @macro: FT_HAS_FAST_GLYPHS (face) */ /* */ /* @description: */ /* XXX */ /* */ #define FT_HAS_FAST_GLYPHS( face ) \ ( face->face_flags & FT_FACE_FLAG_FAST_GLYPHS ) /*************************************************************************/ /* */ /* @macro: FT_HAS_GLYPH_NAMES (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains some */ /* glyph names that can be accessed through @FT_Get_Glyph_Names. */ /* */ #define FT_HAS_GLYPH_NAMES( face ) \ ( face->face_flags & FT_FACE_FLAG_GLYPH_NAMES ) /*************************************************************************/ /* */ /* @macro: FT_HAS_MULTIPLE_MASTERS (face) */ /* */ /* @description: */ /* A macro that returns true whenever a face object contains some */ /* multiple masters. The functions provided by */ /* @FT_MULTIPLE_MASTERS_H are then available to choose the exact */ /* design you want. */ /* */ #define FT_HAS_MULTIPLE_MASTERS( face ) \ ( face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS ) /*************************************************************************/ /* */ /* <Constant> */ /* FT_STYLE_FLAG_ITALIC */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face is */ /* italicized. */ /* */ #define FT_STYLE_FLAG_ITALIC 1 /*************************************************************************/ /* */ /* <Constant> */ /* FT_STYLE_FLAG_BOLD */ /* */ /* <Description> */ /* A bit-field constant, used to indicate that a given face is */ /* emboldened. */ /* */ #define FT_STYLE_FLAG_BOLD 2 /*************************************************************************/ /* */ /* <Type> */ /* FT_Size_Internal */ /* */ /* <Description> */ /* An opaque handle to an FT_Size_InternalRec structure, used to */ /* model private data of a given FT_Size object. */ /* */ typedef struct FT_Size_InternalRec_* FT_Size_Internal; /*************************************************************************/ /* */ /* FreeType base size metrics */ /* */ /* <Struct> */ /* FT_Size_Metrics */ /* */ /* <Description> */ /* The size metrics structure returned scaled important distances for */ /* a given size object. */ /* */ /* <Fields> */ /* x_ppem :: The character width, expressed in integer pixels. */ /* This is the width of the EM square expressed in */ /* pixels, hence the term `ppem' (pixels per EM). */ /* */ /* y_ppem :: The character height, expressed in integer pixels. */ /* This is the height of the EM square expressed in */ /* pixels, hence the term `ppem' (pixels per EM). */ /* */ /* x_scale :: A simple 16.16 fixed point format coefficient used */ /* to scale horizontal distances expressed in font */ /* units to fractional (26.6) pixel coordinates. */ /* */ /* y_scale :: A simple 16.16 fixed point format coefficient used */ /* to scale vertical distances expressed in font */ /* units to fractional (26.6) pixel coordinates. */ /* */ /* ascender :: The ascender, expressed in 26.6 fixed point */ /* pixels. Always positive. */ /* */ /* descender :: The descender, expressed in 26.6 fixed point */ /* pixels. Always positive. */ /* */ /* height :: The text height, expressed in 26.6 fixed point */ /* pixels. Always positive. */ /* */ /* max_advance :: Maximum horizontal advance, expressed in 26.6 */ /* fixed point pixels. Always positive. */ /* */ /* <Note> */ /* The values of `ascender', `descender', and `height' are only the */ /* scaled versions of `face->ascender', `face->descender', and */ /* `face->height'. */ /* */ /* Unfortunately, due to glyph hinting, these values might not be */ /* exact for certain fonts, they thus must be treated as unreliable */ /* with an error margin of at least one pixel! */ /* */ /* Indeed, the only way to get the exact pixel ascender and descender */ /* is to render _all_ glyphs. As this would be a definite */ /* performance hit, it is up to client applications to perform such */ /* computations. */ /* */ typedef struct FT_Size_Metrics_ { FT_UShort x_ppem; /* horizontal pixels per EM */ FT_UShort y_ppem; /* vertical pixels per EM */ FT_Fixed x_scale; /* two scales used to convert font units */ FT_Fixed y_scale; /* to 26.6 frac. pixel coordinates.. */ FT_Pos ascender; /* ascender in 26.6 frac. pixels */ FT_Pos descender; /* descender in 26.6 frac. pixels */ FT_Pos height; /* text height in 26.6 frac. pixels */ FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */ } FT_Size_Metrics; /*************************************************************************/ /* */ /* FreeType base size class */ /* */ /* <Struct> */ /* FT_SizeRec */ /* */ /* <Description> */ /* FreeType root size class structure. A size object models the */ /* resolution and pointsize dependent data of a given face. */ /* */ /* <Fields> */ /* face :: Handle to the parent face object. */ /* */ /* generic :: A typeless pointer, which is unused by the FreeType */ /* library or any of its drivers. It can be used by */ /* client applications to link their own data to each size */ /* object. */ /* */ /* metrics :: Metrics for this size object. This field is read-only. */ /* */ typedef struct FT_SizeRec_ { FT_Face face; /* parent face object */ FT_Generic generic; /* generic pointer for client uses */ FT_Size_Metrics metrics; /* size metrics */ FT_Size_Internal internal; } FT_SizeRec; /*************************************************************************/ /* */ /* <Struct> */ /* FT_SubGlyph */ /* */ /* <Description> */ /* The subglyph structure is an internal object used to describe */ /* subglyphs (for example, in the case of composites). */ /* */ /* <Note> */ /* The subglyph implementation is not part of the high-level API, */ /* hence the forward structure declaration. */ /* */ typedef struct FT_SubGlyph_ FT_SubGlyph; /*************************************************************************/ /* */ /* <Type> */ /* FT_Slot_Internal */ /* */ /* <Description> */ /* An opaque handle to an FT_Slot_InternalRec structure, used to */ /* model private data of a given FT_GlyphSlot object. */ /* */ typedef struct FT_Slot_InternalRec_* FT_Slot_Internal; /*************************************************************************/ /* */ /* FreeType Glyph Slot base class */ /* */ /* <Struct> */ /* FT_GlyphSlotRec */ /* */ /* <Description> */ /* FreeType root glyph slot class structure. A glyph slot is a */ /* container where individual glyphs can be loaded, be they */ /* vectorial or bitmap/graymaps. */ /* */ /* <Fields> */ /* library :: A handle to the FreeType library instance */ /* this slot belongs to. */ /* */ /* face :: A handle to the parent face object. */ /* */ /* next :: In some cases (like some font tools), several */ /* glyph slots per face object can be a good */ /* thing. As this is rare, the glyph slots are */ /* listed through a direct, single-linked list */ /* using its `next' field. */ /* */ /* generic :: A typeless pointer which is unused by the */ /* FreeType library or any of its drivers. It */ /* can be used by client applications to link */ /* their own data to each glyph slot object. */ /* */ /* metrics :: The metrics of the last loaded glyph in the */ /* slot. The returned values depend on the last */ /* load flags (see the FT_Load_Glyph() API */ /* function) and can be expressed either in 26.6 */ /* fractional pixels or font units. */ /* */ /* Note that even when the glyph image is */ /* transformed, the metrics are not. */ /* */ /* linearHoriAdvance :: For scalable formats only, this field holds */ /* the linearly scaled horizontal advance width */ /* for the glyph (i.e. the scaled and unhinted */ /* value of the hori advance). This can be */ /* important to perform correct WYSIWYG layout. */ /* */ /* Note that this value is expressed by default */ /* in 16.16 pixels. However, when the glyph is */ /* loaded with the FT_LOAD_LINEAR_DESIGN flag, */ /* this field contains simply the value of the */ /* advance in original font units. */ /* */ /* linearVertAdvance :: For scalable formats only, this field holds */ /* the linearly scaled vertical advance height */ /* for the glyph. See linearHoriAdvance for */ /* comments. */ /* */ /* advance :: This is the transformed advance width for the */ /* glyph. */ /* */ /* format :: This field indicates the format of the image */ /* contained in the glyph slot. Typically */ /* ft_glyph_format_bitmap, */ /* ft_glyph_format_outline, and */ /* ft_glyph_format_composite, but others are */ /* possible. */ /* */ /* bitmap :: This field is used as a bitmap descriptor */ /* when the slot format is */ /* ft_glyph_format_bitmap. Note that the */ /* address and content of the bitmap buffer can */ /* change between calls of FT_Load_Glyph() and a */ /* few other functions. */ /* */ /* bitmap_left :: This is the bitmap's left bearing expressed */ /* in integer pixels. Of course, this is only */ /* valid if the format is */ /* ft_glyph_format_bitmap. */ /* */ /* bitmap_top :: This is the bitmap's top bearing expressed in */ /* integer pixels. Remember that this is the */ /* distance from the baseline to the top-most */ /* glyph scanline, upwards y-coordinates being */ /* *positive*. */ /* */ /* outline :: The outline descriptor for the current glyph */ /* image if its format is */ /* ft_glyph_bitmap_outline. */ /* */ /* num_subglyphs :: The number of subglyphs in a composite glyph. */ /* This format is only valid for the composite */ /* glyph format, that should normally only be */ /* loaded with the FT_LOAD_NO_RECURSE flag. */ /* */ /* subglyphs :: An array of subglyph descriptors for */ /* composite glyphs. There are `num_subglyphs' */ /* elements in there. */ /* */ /* control_data :: Certain font drivers can also return the */ /* control data for a given glyph image (e.g. */ /* TrueType bytecode, Type 1 charstrings, etc.). */ /* This field is a pointer to such data. */ /* */ /* control_len :: This is the length in bytes of the control */ /* data. */ /* */ /* other :: Really wicked formats can use this pointer to */ /* present their own glyph image to client apps. */ /* Note that the app will need to know about the */ /* image format. */ /* */ /* <Note> */ /* If @FT_Load_Glyph() is called with default flags (see */ /* @FT_LOAD_DEFAULT ) the glyph image is loaded in the glyph slot in */ /* its native format (e.g. a vectorial outline for TrueType and */ /* Type 1 formats). */ /* */ /* This image can later be converted into a bitmap by calling */ /* FT_Render_Glyph(). This function finds the current renderer for */ /* the native image's format then invokes it. */ /* */ /* The renderer is in charge of transforming the native image through */ /* the slot's face transformation fields, then convert it into a */ /* bitmap that is returned in `slot->bitmap'. */ /* */ /* Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */ /* to specify the position of the bitmap relative to the current pen */ /* position (e.g. coordinates [0,0] on the baseline). Of course, */ /* `slot->format' is also changed to `ft_glyph_format_bitmap' . */ /* */ typedef struct FT_GlyphSlotRec_ { FT_Library library; FT_Face face; FT_GlyphSlot next; FT_UInt flags; FT_Generic generic; FT_Glyph_Metrics metrics; FT_Fixed linearHoriAdvance; FT_Fixed linearVertAdvance; FT_Vector advance; FT_Glyph_Format format; FT_Bitmap bitmap; FT_Int bitmap_left; FT_Int bitmap_top; FT_Outline outline; FT_UInt num_subglyphs; FT_SubGlyph* subglyphs; void* control_data; long control_len; void* other; FT_Slot_Internal internal; } FT_GlyphSlotRec; /*************************************************************************/ /*************************************************************************/ /* */ /* F U N C T I O N S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* FT_Init_FreeType */ /* */ /* <Description> */ /* Initializes a new FreeType library object. The set of drivers */ /* that are registered by this function is determined at build time. */ /* */ /* <Output> */ /* alibrary :: A handle to a new library object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Init_FreeType( FT_Library *alibrary ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_FreeType */ /* */ /* <Description> */ /* Destroys a given FreeType library object and all of its childs, */ /* including resources, drivers, faces, sizes, etc. */ /* */ /* <Input> */ /* library :: A handle to the target library object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Done_FreeType( FT_Library library ); /*************************************************************************/ /* */ /* <Enum> */ /* FT_Open_Flags */ /* */ /* <Description> */ /* An enumeration used to list the bit flags used within the */ /* `flags' field of the @FT_Open_Args structure. */ /* */ /* <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. */ /* */ /* <Note> */ /* The `ft_open_memory', `ft_open_stream', and `ft_open_pathname' */ /* flags are mutually exclusive. */ /* */ typedef enum { ft_open_memory = 1, ft_open_stream = 2, ft_open_pathname = 4, ft_open_driver = 8, ft_open_params = 16 } FT_Open_Flags; /*************************************************************************/ /* */ /* <Struct> */ /* FT_Parameter */ /* */ /* <Description> */ /* A simple structure used to pass more or less generic parameters */ /* to FT_Open_Face(). */ /* */ /* <Fields> */ /* tag :: A 4-byte identification tag. */ /* */ /* data :: A pointer to the parameter data. */ /* */ /* <Note> */ /* The id and function of parameters are driver-specific. */ /* */ typedef struct FT_Parameter_ { FT_ULong tag; FT_Pointer data; } FT_Parameter; /*************************************************************************/ /* */ /* <Struct> */ /* FT_Open_Args */ /* */ /* <Description> */ /* A structure used to indicate how to open a new font file/stream. */ /* A pointer to such a structure can be used as a parameter for the */ /* functions @FT_Open_Face() & @FT_Attach_Stream(). */ /* */ /* <Fields> */ /* flags :: A set of bit flags indicating how to use the */ /* structure. */ /* */ /* memory_base :: The first byte of the file in memory. */ /* */ /* memory_size :: The size in bytes of the file in memory. */ /* */ /* pathname :: A pointer to an 8-bit file pathname. */ /* */ /* stream :: A handle to a source stream object. */ /* */ /* driver :: This field is exclusively used by FT_Open_Face(); */ /* it simply specifies the font driver to use to open */ /* the face. If set to 0, FreeType will try to load */ /* the face with each one of the drivers in its list. */ /* */ /* num_params :: The number of extra parameters. */ /* */ /* params :: Extra parameters passed to the font driver when */ /* opening a new face. */ /* */ /* <Note> */ /* The stream type is determined by the contents of `flags' which */ /* are tested in the following order by @FT_Open_Face: */ /* */ /* If the `ft_open_memory' bit is set, assume that this is a */ /* memory file of `memory_size' bytes,located at `memory_address'. */ /* */ /* Otherwise, if the `ft_open_stream' bit is set, assume that a */ /* custom input stream `stream' is used. */ /* */ /* Otherwise, if the `ft_open_pathname' bit is set, assume that this */ /* is a normal file and use `pathname' to open it. */ /* */ /* If the `ft_open_driver' bit is set, @FT_Open_Face() will only */ /* try to open the file with the driver whose handler is in `driver'. */ /* */ /* If the `ft_open_params' bit is set, the parameters given by */ /* `num_params' and `params' will be used. They are ignored */ /* otherwise. */ /* */ typedef struct FT_Open_Args_ { FT_Open_Flags flags; const FT_Byte* memory_base; FT_Long memory_size; FT_String* pathname; FT_Stream stream; FT_Module driver; FT_Int num_params; FT_Parameter* params; } FT_Open_Args; /*************************************************************************/ /* */ /* <Function> */ /* FT_New_Face */ /* */ /* <Description> */ /* Creates a new face object from a given resource and typeface index */ /* using a pathname to the font file. */ /* */ /* <InOut> */ /* library :: A handle to the library resource. */ /* */ /* <Input> */ /* pathname :: A path to the font file. */ /* */ /* face_index :: The index of the face within the resource. The */ /* first face has index 0. */ /* <Output> */ /* aface :: A handle to a new face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* Unlike FreeType 1.x, this function automatically creates a glyph */ /* slot for the face object which can be accessed directly through */ /* `face->glyph'. */ /* */ /* FT_New_Face() can be used to determine and/or check the font */ /* format of a given font resource. If the `face_index' field is */ /* negative, the function will _not_ return any face handle in */ /* `aface'. Its return value should be 0 if the font format is */ /* recognized, or non-zero otherwise. */ /* */ FT_EXPORT( FT_Error ) FT_New_Face( FT_Library library, const char* filepathname, FT_Long face_index, FT_Face *aface ); /*************************************************************************/ /* */ /* <Function> */ /* FT_New_Memory_Face */ /* */ /* <Description> */ /* Creates a new face object from a given resource and typeface index */ /* using a font file already loaded into memory. */ /* */ /* <InOut> */ /* library :: A handle to the library resource. */ /* */ /* <Input> */ /* file_base :: A pointer to the beginning of the font data. */ /* */ /* file_size :: The size of the memory chunk used by the font data. */ /* */ /* face_index :: The index of the face within the resource. The */ /* first face has index 0. */ /* <Output> */ /* aface :: A handle to a new face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The font data bytes are used _directly_ by the @FT_Face object. */ /* This means that they are not copied, and that the client is */ /* responsible for releasing/destroying them _after_ the */ /* corresponding call to @FT_Done_Face . */ /* */ /* Unlike FreeType 1.x, this function automatically creates a glyph */ /* slot for the face object which can be accessed directly through */ /* `face->glyph'. */ /* */ /* FT_New_Memory_Face() can be used to determine and/or check the */ /* font format of a given font resource. If the `face_index' field */ /* is negative, the function will _not_ return any face handle in */ /* `aface'. Its return value should be 0 if the font format is */ /* recognized, or non-zero otherwise. */ /* */ FT_EXPORT( FT_Error ) FT_New_Memory_Face( FT_Library library, const FT_Byte* file_base, FT_Long file_size, FT_Long face_index, FT_Face *aface ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Open_Face */ /* */ /* <Description> */ /* Opens a face object from a given resource and typeface index using */ /* an `FT_Open_Args' structure. If the face object doesn't exist, it */ /* will be created. */ /* */ /* <InOut> */ /* library :: A handle to the library resource. */ /* */ /* <Input> */ /* args :: A pointer to an `FT_Open_Args' structure which must */ /* be filled by the caller. */ /* */ /* face_index :: The index of the face within the resource. The */ /* first face has index 0. */ /* <Output> */ /* aface :: A handle to a new face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* Unlike FreeType 1.x, this function automatically creates a glyph */ /* slot for the face object which can be accessed directly through */ /* `face->glyph'. */ /* */ /* FT_Open_Face() can be used to determine and/or check the font */ /* format of a given font resource. If the `face_index' field is */ /* negative, the function will _not_ return any face handle in */ /* `*face'. Its return value should be 0 if the font format is */ /* recognized, or non-zero otherwise. */ /* */ FT_EXPORT( FT_Error ) FT_Open_Face( FT_Library library, FT_Open_Args* args, FT_Long face_index, FT_Face *aface ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Attach_File */ /* */ /* <Description> */ /* `Attaches' a given font file to an existing face. This is usually */ /* to read additional information for a single face object. For */ /* example, it is used to read the AFM files that come with Type 1 */ /* fonts in order to add kerning data and other metrics. */ /* */ /* <InOut> */ /* face :: The target face object. */ /* */ /* <Input> */ /* filepathname :: An 8-bit pathname naming the `metrics' file. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* If your font file is in memory, or if you want to provide your */ /* own input stream object, use FT_Attach_Stream(). */ /* */ /* The meaning of the `attach' action (i.e., what really happens when */ /* the new file is read) is not fixed by FreeType itself. It really */ /* depends on the font format (and thus the font driver). */ /* */ /* Client applications are expected to know what they are doing */ /* when invoking this function. Most drivers simply do not implement */ /* file attachments. */ /* */ FT_EXPORT( FT_Error ) FT_Attach_File( FT_Face face, const char* filepathname ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Attach_Stream */ /* */ /* <Description> */ /* This function is similar to FT_Attach_File() with the exception */ /* that it reads the attachment from an arbitrary stream. */ /* */ /* <InOut> */ /* face :: The target face object. */ /* */ /* <Input> */ /* parameters :: A pointer to an FT_Open_Args structure used to */ /* describe the input stream to FreeType. */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* The meaning of the `attach' (i.e. what really happens when the */ /* new file is read) is not fixed by FreeType itself. It really */ /* depends on the font format (and thus the font driver). */ /* */ /* Client applications are expected to know what they are doing */ /* when invoking this function. Most drivers simply do not implement */ /* file attachments. */ /* */ FT_EXPORT( FT_Error ) FT_Attach_Stream( FT_Face face, FT_Open_Args* parameters ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Done_Face */ /* */ /* <Description> */ /* Discards a given face object, as well as all of its child slots */ /* and sizes. */ /* */ /* <Input> */ /* face :: A handle to a target face object. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Done_Face( FT_Face face ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Set_Char_Size */ /* */ /* <Description> */ /* Sets the character dimensions of a given face object. The */ /* `char_width' and `char_height' values are used for the width and */ /* height, respectively, expressed in 26.6 fractional points. */ /* */ /* If the horizontal or vertical resolution values are zero, a */ /* default value of 72dpi is used. Similarly, if one of the */ /* character dimensions is zero, its value is set equal to the other. */ /* */ /* <InOut> */ /* size :: A handle to a target size object. */ /* */ /* <Input> */ /* char_width :: The character width, in 26.6 fractional points. */ /* */ /* char_height :: The character height, in 26.6 fractional */ /* points. */ /* */ /* horz_resolution :: The horizontal resolution. */ /* */ /* vert_resolution :: The vertical resolution. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* When dealing with fixed-size faces (i.e., non-scalable formats), */ /* use the function FT_Set_Pixel_Sizes(). */ /* */ FT_EXPORT( FT_Error ) FT_Set_Char_Size( FT_Face face, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt horz_resolution, FT_UInt vert_resolution ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Set_Pixel_Sizes */ /* */ /* <Description> */ /* Sets the character dimensions of a given face object. The width */ /* and height are expressed in integer pixels. */ /* */ /* If one of the character dimensions is zero, its value is set equal */ /* to the other. */ /* */ /* <InOut> */ /* face :: A handle to the target face object. */ /* */ /* <Input> */ /* pixel_width :: The character width, in integer pixels. */ /* */ /* pixel_height :: The character height, in integer pixels. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* */ /* <Note> */ /* The values of `pixel_width' and `pixel_height' correspond to the */ /* pixel values of the _typographic_ character size, which are NOT */ /* necessarily the same as the dimensions of the glyph `bitmap */ /* cells'. */ /* */ /* The `character size' is really the size of an abstract square */ /* called the `EM', used to design the font. However, depending */ /* on the font design, glyphs will be smaller or greater than the */ /* EM. */ /* */ /* This means that setting the pixel size to, say, 8x8 doesn't */ /* guarantee in any way that you will get glyph bitmaps that all fit */ /* within an 8x8 cell (sometimes even far from it). */ /* */ FT_EXPORT( FT_Error ) FT_Set_Pixel_Sizes( FT_Face face, FT_UInt pixel_width, FT_UInt pixel_height ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Load_Glyph */ /* */ /* <Description> */ /* A function used to load a single glyph within a given glyph slot, */ /* for a given size. */ /* */ /* <InOut> */ /* face :: A handle to the target face object where the glyph */ /* will be loaded. */ /* */ /* <Input> */ /* glyph_index :: The index of the glyph in the font file. */ /* */ /* load_flags :: A flag indicating what to load for this glyph. The */ /* FT_LOAD_XXX constants can be used to control the */ /* glyph loading process (e.g., whether the outline */ /* should be scaled, whether to load bitmaps or not, */ /* whether to hint the outline, etc). */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* If the glyph image is not a bitmap, and if the bit flag */ /* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */ /* transformed with the information passed to a previous call to */ /* FT_Set_Transform(). */ /* */ /* Note that this also transforms the `face.glyph.advance' field, but */ /* *not* the values in `face.glyph.metrics'. */ /* */ FT_EXPORT( FT_Error ) FT_Load_Glyph( FT_Face face, FT_UInt glyph_index, FT_Int load_flags ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Load_Char */ /* */ /* <Description> */ /* A function used to load a single glyph within a given glyph slot, */ /* for a given size, according to its character code. */ /* */ /* <InOut> */ /* face :: A handle to a target face object where the glyph */ /* will be loaded. */ /* */ /* <Input> */ /* char_code :: The glyph's character code, according to the */ /* current charmap used in the face. */ /* */ /* load_flags :: A flag indicating what to load for this glyph. The */ /* FT_LOAD_XXX constants can be used to control the */ /* glyph loading process (e.g., whether the outline */ /* should be scaled, whether to load bitmaps or not, */ /* whether to hint the outline, etc). */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* If the face has no current charmap, or if the character code */ /* is not defined in the charmap, this function will return an */ /* error. */ /* */ /* If the glyph image is not a bitmap, and if the bit flag */ /* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */ /* transformed with the information passed to a previous call to */ /* FT_Set_Transform(). */ /* */ /* Note that this also transforms the `face.glyph.advance' field, but */ /* *not* the values in `face.glyph.metrics'. */ /* */ FT_EXPORT( FT_Error ) FT_Load_Char( FT_Face face, FT_ULong char_code, FT_Int load_flags ); /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_NO_SCALE */ /* */ /* <Description> */ /* A bit field constant, used with FT_Load_Glyph() to indicate that */ /* the vector outline being loaded should not be scaled to 26.6 */ /* fractional pixels, but kept in notional units. */ /* */ #define FT_LOAD_NO_SCALE 1 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_NO_HINTING */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the vector outline being loaded should not be fitted to the pixel */ /* grid but simply scaled to 26.6 fractional pixels. */ /* */ /* This flag is ignored if FT_LOAD_NO_SCALE is set. */ /* */ #define FT_LOAD_NO_HINTING 2 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_RENDER */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the function should load the glyph and immediately convert it into */ /* a bitmap, if necessary, by calling FT_Render_Glyph(). */ /* */ /* Note that by default, FT_Load_Glyph() loads the glyph image in its */ /* native format. */ /* */ #define FT_LOAD_RENDER 4 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_NO_BITMAP */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the function should not load the bitmap or pixmap of a given */ /* glyph. This is useful when you do not want to load the embedded */ /* bitmaps of scalable formats, as the native glyph image will be */ /* loaded, and can then be rendered through FT_Render_Glyph(). */ /* */ #define FT_LOAD_NO_BITMAP 8 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_VERTICAL_LAYOUT */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the glyph image should be prepared for vertical layout. This */ /* basically means that `face.glyph.advance' will correspond to the */ /* vertical advance height (instead of the default horizontal */ /* advance width), and that the glyph image will translated to match */ /* the vertical bearings positions. */ /* */ #define FT_LOAD_VERTICAL_LAYOUT 16 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_FORCE_AUTOHINT */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the function should try to auto-hint the glyphs, even if a driver */ /* specific hinter is available. */ /* */ #define FT_LOAD_FORCE_AUTOHINT 32 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_CROP_BITMAP */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the font driver should try to crop the bitmap (i.e. remove all */ /* space around its black bits) when loading it. For now, this */ /* really only works with embedded bitmaps in TrueType fonts. */ /* */ #define FT_LOAD_CROP_BITMAP 64 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_PEDANTIC */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the glyph loader should perform a pedantic bytecode */ /* interpretation. Many popular fonts come with broken glyph */ /* programs. When this flag is set, loading them will return an */ /* error. Otherwise, errors are ignored by the loader, sometimes */ /* resulting in ugly glyphs. */ /* */ #define FT_LOAD_PEDANTIC 128 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the glyph loader should ignore the global advance width defined */ /* in the font. As far as we know, this is only used by the */ /* X-TrueType font server, in order to deal correctly with the */ /* incorrect metrics contained in DynaLab's TrueType CJK fonts. */ /* */ #define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH 512 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_NO_RECURSE */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the glyph loader should not load composite glyph recursively. */ /* Rather, when a composite glyph is encountered, it should set */ /* the values of `num_subglyphs' and `subglyphs', as well as set */ /* `face->glyph.format' to ft_glyph_format_composite. */ /* */ /* This is for use by the auto-hinter and possibly other tools. */ /* For nearly all applications, this flags should be left unset */ /* when invoking FT_Load_Glyph(). */ /* */ /* Note that the flag forces the load of unscaled glyphs. */ /* */ #define FT_LOAD_NO_RECURSE 1024 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_IGNORE_TRANSFORM */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the glyph loader should not try to transform the loaded glyph */ /* image. */ /* */ #define FT_LOAD_IGNORE_TRANSFORM 2048 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_MONOCHROME */ /* */ /* <Description> */ /* Only used with FT_LOAD_RENDER set, it indicates that the returned */ /* glyph image should be 1-bit monochrome. This really tells the */ /* glyph loader to use `ft_render_mode_mono' when calling */ /* FT_Render_Glyph(). */ /* */ #define FT_LOAD_MONOCHROME 4096 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_LINEAR_DESIGN */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the function should return the linearly scaled metrics expressed */ /* in original font units, instead of the default 16.16 pixel values. */ /* */ #define FT_LOAD_LINEAR_DESIGN 8192 /* temporary hack! */ #define FT_LOAD_SBITS_ONLY 16384 /*************************************************************************/ /* */ /* <Constant> */ /* FT_LOAD_DEFAULT */ /* */ /* <Description> */ /* A bit-field constant, used with FT_Load_Glyph() to indicate that */ /* the function should try to load the glyph normally, i.e., */ /* embedded bitmaps are favored over outlines, vectors are always */ /* scaled and grid-fitted. */ /* */ #define FT_LOAD_DEFAULT 0 /*************************************************************************/ /* */ /* <Function> */ /* FT_Set_Transform */ /* */ /* <Description> */ /* A function used to set the transformation that is applied to glyph */ /* images just before they are converted to bitmaps in a glyph slot */ /* when FT_Render_Glyph() is called. */ /* */ /* <InOut> */ /* face :: A handle to the source face object. */ /* */ /* <Input> */ /* matrix :: A pointer to the transformation's 2x2 matrix. Use 0 for */ /* the identity matrix. */ /* delta :: A pointer to the translation vector. Use 0 for the null */ /* vector. */ /* */ /* <Note> */ /* The transformation is only applied to scalable image formats after */ /* the glyph has been loaded. It means that hinting is unaltered by */ /* the transformation and is performed on the character size given in */ /* the last call to FT_Set_Char_Sizes() or FT_Set_Pixel_Sizes(). */ /* */ FT_EXPORT( void ) FT_Set_Transform( FT_Face face, FT_Matrix* matrix, FT_Vector* delta ); /*************************************************************************/ /* */ /* <Enum> */ /* FT_Render_Mode */ /* */ /* <Description> */ /* An enumeration type that lists the render modes supported by the */ /* FreeType 2 renderer(s). A renderer is in charge of converting a */ /* glyph image into a bitmap. */ /* */ /* <Fields> */ /* ft_render_mode_normal :: This is the default render mode; it */ /* corresponds to 8-bit anti-aliased */ /* bitmaps, using 256 levels of gray. */ /* */ /* ft_render_mode_mono :: This render mode is used to produce 1-bit */ /* monochrome bitmaps. */ /* */ /* <Note> */ /* There is no render mode to produce 8-bit `monochrome' bitmaps -- */ /* you have to make the conversion yourself if you need such things */ /* (besides, FreeType is not a graphics library). */ /* */ /* More modes might appear later for specific display modes (e.g. TV, */ /* LCDs, etc.). They will be supported through the simple addition */ /* of a renderer module, with no changes to the rest of the engine. */ /* */ typedef enum FT_Render_Mode_ { ft_render_mode_normal = 0, ft_render_mode_mono = 1 } FT_Render_Mode; /*************************************************************************/ /* */ /* <Function> */ /* FT_Render_Glyph */ /* */ /* <Description> */ /* Converts a given glyph image to a bitmap. It does so by */ /* inspecting the glyph image format, find the relevant renderer, and */ /* invoke it. */ /* */ /* <InOut> */ /* slot :: A handle to the glyph slot containing the image to */ /* convert. */ /* */ /* <Input> */ /* render_mode :: This is the render mode used to render the glyph */ /* image into a bitmap. See FT_Render_Mode for a list */ /* of possible values. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ FT_EXPORT( FT_Error ) FT_Render_Glyph( FT_GlyphSlot slot, FT_UInt render_mode ); /*************************************************************************/ /* */ /* <Enum> */ /* FT_Kerning_Mode */ /* */ /* <Description> */ /* An enumeration used to specify which kerning values to return in */ /* FT_Get_Kerning(). */ /* */ /* <Fields> */ /* ft_kerning_default :: Return scaled and grid-fitted kerning */ /* distances (value is 0). */ /* */ /* ft_kerning_unfitted :: Return scaled but un-grid-fitted kerning */ /* distances. */ /* */ /* ft_kerning_unscaled :: Return the kerning vector in original font */ /* units. */ /* */ typedef enum FT_Kerning_Mode_ { ft_kerning_default = 0, ft_kerning_unfitted, ft_kerning_unscaled } FT_Kerning_Mode; /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Kerning */ /* */ /* <Description> */ /* Returns the kerning vector between two glyphs of a same face. */ /* */ /* <Input> */ /* face :: A handle to a source face object. */ /* */ /* left_glyph :: The index of the left glyph in the kern pair. */ /* */ /* right_glyph :: The index of the right glyph in the kern pair. */ /* */ /* kern_mode :: See FT_Kerning_Mode() for more information. */ /* Determines the scale/dimension of the returned */ /* kerning vector. */ /* */ /* <Output> */ /* akerning :: The kerning vector. This is in font units for */ /* scalable formats, and in pixels for fixed-sizes */ /* formats. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* Only horizontal layouts (left-to-right & right-to-left) are */ /* supported by this method. Other layouts, or more sophisticated */ /* kernings, are out of the scope of this API function -- they can be */ /* implemented through format-specific interfaces. */ /* */ FT_EXPORT( FT_Error ) FT_Get_Kerning( FT_Face face, FT_UInt left_glyph, FT_UInt right_glyph, FT_UInt kern_mode, FT_Vector *akerning ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Glyph_Name */ /* */ /* <Description> */ /* Retrieves the ASCII name of a given glyph in a face. This only */ /* works for those faces where FT_HAS_GLYPH_NAME(face) returns true. */ /* */ /* <Input> */ /* face :: A handle to a source face object. */ /* */ /* glyph_index :: The glyph index. */ /* */ /* buffer_max :: The maximal number of bytes available in the */ /* buffer. */ /* */ /* <Output> */ /* buffer :: A pointer to a target buffer where the name will be */ /* copied to. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* An error is returned if the face doesn't provide glyph names or if */ /* the glyph index is invalid. In all cases of failure, the first */ /* byte of `buffer' will be set to 0 to indicate an empty name. */ /* */ /* The glyph name is truncated to fit within the buffer if it is too */ /* long. The returned string is always zero-terminated. */ /* */ /* This function is not compiled within the library if the config */ /* macro FT_CONFIG_OPTION_NO_GLYPH_NAMES is defined in */ /* `include/freetype/config/ftoptions.h' */ /* */ FT_EXPORT( FT_Error ) FT_Get_Glyph_Name( FT_Face face, FT_UInt glyph_index, FT_Pointer buffer, FT_UInt buffer_max ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Postscript_Name */ /* */ /* <Description> */ /* Retrieves the ASCII Postscript name of a given face, if available. */ /* This should only work with Postscript and TrueType fonts. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* <Return> */ /* A pointer to the face's Postscript name. NULL if un-available. */ /* */ /* <Note> */ /* The returned pointer is owned by the face and will be destroyed */ /* with it. */ /* */ FT_EXPORT( const char* ) FT_Get_Postscript_Name( FT_Face face ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Select_Charmap */ /* */ /* <Description> */ /* Selects a given charmap by its encoding tag (as listed in */ /* `freetype.h'). */ /* */ /* <InOut> */ /* face :: A handle to the source face object. */ /* */ /* <Input> */ /* encoding :: A handle to the selected charmap. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* This function will return an error if no charmap in the face */ /* corresponds to the encoding queried here. */ /* */ FT_EXPORT( FT_Error ) FT_Select_Charmap( FT_Face face, FT_Encoding encoding ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Set_Charmap */ /* */ /* <Description> */ /* Selects a given charmap for character code to glyph index */ /* decoding. */ /* */ /* <InOut> */ /* face :: A handle to the source face object. */ /* */ /* <Input> */ /* charmap :: A handle to the selected charmap. */ /* */ /* <Return> */ /* FreeType error code. 0 means success. */ /* */ /* <Note> */ /* This function will return an error if the charmap is not part of */ /* the face (i.e., if it is not listed in the face->charmaps[] */ /* table). */ /* */ FT_EXPORT( FT_Error ) FT_Set_Charmap( FT_Face face, FT_CharMap charmap ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Char_Index */ /* */ /* <Description> */ /* Returns the glyph index of a given character code. This function */ /* uses a charmap object to do the translation. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* charcode :: The character code. */ /* */ /* <Return> */ /* The glyph index. 0 means `undefined character code'. */ /* */ FT_EXPORT( FT_UInt ) FT_Get_Char_Index( FT_Face face, FT_ULong charcode ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Get_Name_Index */ /* */ /* <Description> */ /* Returns the glyph index of a given glyph name. This function uses */ /* driver specific objects to do the translation. */ /* */ /* <Input> */ /* face :: A handle to the source face object. */ /* */ /* glyph_name :: The glyph name. */ /* */ /* <Return> */ /* The glyph index. 0 means `undefined character code'. */ /* */ FT_EXPORT( FT_UInt ) FT_Get_Name_Index( FT_Face face, FT_String* glyph_name ); /*************************************************************************/ /* */ /* <Section> */ /* computations */ /* */ /* <Title> */ /* Computations */ /* */ /* <Abstract> */ /* Crunching fixed numbers and vectors */ /* */ /* <Description> */ /* This section contains various functions used to perform */ /* computations on 16.16 fixed-float numbers or 2d vectors. */ /* */ /* <Order> */ /* FT_MulDiv */ /* FT_MulFix */ /* FT_DivFix */ /* FT_RoundFix */ /* FT_CeilFix */ /* FT_FloorFix */ /* FT_Vector_Transform */ /* FT_Matrix_Multiply */ /* FT_Matrix_Invert */ /* */ /*************************************************************************/ /*************************************************************************/ /* */ /* <Function> */ /* FT_MulDiv */ /* */ /* <Description> */ /* A very simple function used to perform the computation `(a*b)/c' */ /* with maximal accuracy (it uses a 64-bit intermediate integer */ /* whenever necessary). */ /* */ /* This function isn't necessarily as fast as some processor specific */ /* operations, but is at least completely portable. */ /* */ /* <Input> */ /* a :: The first multiplier. */ /* b :: The second multiplier. */ /* c :: The divisor. */ /* */ /* <Return> */ /* The result of `(a*b)/c'. This function never traps when trying to */ /* divide by zero; it simply returns `MaxInt' or `MinInt' depending */ /* on the signs of `a' and `b'. */ /* */ FT_EXPORT( FT_Long ) FT_MulDiv( FT_Long a, FT_Long b, FT_Long c ); /*************************************************************************/ /* */ /* <Function> */ /* FT_MulFix */ /* */ /* <Description> */ /* A very simple function used to perform the computation */ /* `(a*b)/0x10000' with maximal accuracy. Most of the time this is */ /* used to multiply a given value by a 16.16 fixed float factor. */ /* */ /* <Input> */ /* a :: The first multiplier. */ /* b :: The second multiplier. Use a 16.16 factor here whenever */ /* possible (see note below). */ /* */ /* <Return> */ /* The result of `(a*b)/0x10000'. */ /* */ /* <Note> */ /* This function has been optimized for the case where the absolute */ /* value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */ /* As this happens mainly when scaling from notional units to */ /* fractional pixels in FreeType, it resulted in noticeable speed */ /* improvements between versions 2.x and 1.x. */ /* */ /* As a conclusion, always try to place a 16.16 factor as the */ /* _second_ argument of this function; this can make a great */ /* difference. */ /* */ FT_EXPORT( FT_Long ) FT_MulFix( FT_Long a, FT_Long b ); /*************************************************************************/ /* */ /* <Function> */ /* FT_DivFix */ /* */ /* <Description> */ /* A very simple function used to perform the computation */ /* `(a*0x10000)/b' with maximal accuracy. Most of the time, this is */ /* used to divide a given value by a 16.16 fixed float factor. */ /* */ /* <Input> */ /* a :: The first multiplier. */ /* b :: The second multiplier. Use a 16.16 factor here whenever */ /* possible (see note below). */ /* */ /* <Return> */ /* The result of `(a*0x10000)/b'. */ /* */ /* <Note> */ /* The optimization for FT_DivFix() is simple: If (a << 16) fits in */ /* 32 bits, then the division is computed directly. Otherwise, we */ /* use a specialized version of the old FT_MulDiv64(). */ /* */ FT_EXPORT( FT_Long ) FT_DivFix( FT_Long a, FT_Long b ); /*************************************************************************/ /* */ /* <Function> */ /* FT_RoundFix */ /* */ /* <Description> */ /* A very simple function used to round a 16.16 fixed number. */ /* */ /* <Input> */ /* a :: The number to be rounded. */ /* */ /* <Return> */ /* The result of `(a + 0x8000) & -0x10000'. */ /* */ FT_EXPORT( FT_Fixed ) FT_RoundFix( FT_Fixed a ); /*************************************************************************/ /* */ /* <Function> */ /* FT_CeilFix */ /* */ /* <Description> */ /* A very simple function used to compute the ceiling function of a */ /* 16.16 fixed number. */ /* */ /* <Input> */ /* a :: The number for which the ceiling function is to be computed. */ /* */ /* <Return> */ /* The result of `(a + 0x10000 - 1) & -0x10000'. */ /* */ FT_EXPORT( FT_Fixed ) FT_CeilFix( FT_Fixed a ); /*************************************************************************/ /* */ /* <Function> */ /* FT_FloorFix */ /* */ /* <Description> */ /* A very simple function used to compute the floor function of a */ /* 16.16 fixed number. */ /* */ /* <Input> */ /* a :: The number for which the floor function is to be computed. */ /* */ /* <Return> */ /* The result of `a & -0x10000'. */ /* */ FT_EXPORT( FT_Fixed ) FT_FloorFix( FT_Fixed a ); /*************************************************************************/ /* */ /* <Function> */ /* FT_Vector_Transform */ /* */ /* <Description> */ /* Transforms a single vector through a 2x2 matrix. */ /* */ /* <InOut> */ /* vector :: The target vector to transform. */ /* */ /* <Input> */ /* matrix :: A pointer to the source 2x2 matrix. */ /* */ /* <Note> */ /* The result is undefined if either `vector' or `matrix' is invalid. */ /* */ FT_EXPORT( void ) FT_Vector_Transform( FT_Vector* vec, FT_Matrix* matrix ); /* */ FT_END_HEADER #endif /* __FREETYPE_H__ */ /* END */