/***************************************************************************/ /* */ /* freetype.h */ /* */ /* FreeType high-level API and common types (specification only). */ /* */ /* Copyright 1996-2000 by */ /* David Turner, Robert Wilhelm, and Werner Lemberg. */ /* */ /* This file is part of the FreeType project, and may only be used */ /* modified and distributed under the terms of the FreeType project */ /* license, LICENSE.TXT. By continuing to use, modify, or distribute */ /* this file you indicate that you have read the license and */ /* understand and accept it fully. */ /* */ /***************************************************************************/ #ifndef FREETYPE_H #define FREETYPE_H /*************************************************************************/ /* */ /* The `raster' component duplicates some of the declarations in */ /* freetype.h for stand-alone use if _FREETYPE_ isn't defined. */ /* */ #define _FREETYPE_ /*************************************************************************/ /* */ /* The FREETYPE_MAJOR and FREETYPE_MINOR macros are used to version the */ /* new FreeType design, which is able to host several kinds of font */ /* drivers. It starts at 2.0. Note that each driver has its own */ /* version number (for example, the TrueType driver is at 1.2, as */ /* defined by the macros TT_FREETYPE_MAJOR and TT_FREETYPE_MINOR in the */ /* file `ttlib/truetype.h'. */ /* */ #define FREETYPE_MAJOR 2 #define FREETYPE_MINOR 0 #include /* read configuration information */ #include #include #ifdef __cplusplus extern "C" { #endif /*************************************************************************/ /*************************************************************************/ /* */ /* B A S I C T Y P E S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* FT_Glyph_Metrics */ /* */ /* */ /* 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. */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Generic_Finalizer */ /* */ /* */ /* 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. */ /* */ /* */ /* 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); /*************************************************************************/ /* */ /* */ /* FT_Generic */ /* */ /* */ /* 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). */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Bitmap_Size */ /* */ /* */ /* 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. */ /* */ /* */ /* 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 */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* FT_Library */ /* */ /* */ /* 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). */ /* */ /* */ /* Library objects are created through FT_Init_FreeType(). */ /* */ typedef struct FT_LibraryRec_ *FT_Library; /*************************************************************************/ /* */ /* */ /* FT_Module */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Driver */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Renderer */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Face */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Size */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_GlyphSlot */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_CharMap */ /* */ /* */ /* 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; /*************************************************************************/ /* */ /* */ /* FT_Encoding */ /* */ /* */ /* An enumeration used to specify encodings supported by charmaps. */ /* Used in the FT_Select_CharMap() API function. */ /* */ /* */ /* 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 = FT_MAKE_TAG('s','y','m','b'), ft_encoding_unicode = FT_MAKE_TAG('u','n','i','c'), ft_encoding_latin_2 = FT_MAKE_TAG('l','a','t','2'), ft_encoding_sjis = FT_MAKE_TAG('s','j','i','s'), ft_encoding_gb2312 = FT_MAKE_TAG('g','b',' ',' '), ft_encoding_big5 = FT_MAKE_TAG('b','i','g','5'), ft_encoding_wansung = FT_MAKE_TAG('w','a','n','s'), ft_encoding_johab = FT_MAKE_TAG('j','o','h','a'), ft_encoding_adobe_standard = FT_MAKE_TAG('A','D','O','B'), ft_encoding_adobe_expert = FT_MAKE_TAG('A','D','B','E'), ft_encoding_adobe_custom = FT_MAKE_TAG('A','D','B','C'), ft_encoding_apple_roman = FT_MAKE_TAG('a','r','m','n') /* other encodings might be defined in the future */ } FT_Encoding; /*************************************************************************/ /* */ /* */ /* FT_CharMapRec */ /* */ /* */ /* The base charmap class. */ /* */ /* */ /* 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. */ /* */ /* */ /* 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 */ /* */ /* */ /* FT_FaceRec */ /* */ /* */ /* FreeType root face class structure. A face object models the */ /* resolution and point-size independent data found in a font file. */ /* */ /* */ /* num_faces :: In the case where the face is located in a */ /* collection (i.e., a resource which embeds */ /* several faces), this is the total number of */ /* faces found in the resource. 1 by default. */ /* */ /* face_index :: The index of the face in its resource. */ /* Usually, this is 0 for all normal font */ /* formats. It can be more in the case of */ /* collections (which embed several fonts in a */ /* single resource/file). */ /* */ /* face_flags :: A set of bit flags that give important */ /* information about the face; see the */ /* FT_FACE_FLAG_XXX macros for details. */ /* */ /* style_flags :: A set of bit flags indicating the style of */ /* the face (i.e., italic, bold, underline, */ /* etc). */ /* */ /* num_glyphs :: The total number of glyphs in the face. */ /* */ /* family_name :: The face's family name. This is an ASCII */ /* string, usually in English, which describes */ /* the typeface's family (like `Times New */ /* Roman', `Bodoni', `Garamond', etc). This */ /* is a least common denominator used to list */ /* fonts. Some formats (TrueType & OpenType) */ /* provide localized and Unicode versions of */ /* this string. Applications should use the */ /* format specific interface to access them. */ /* */ /* style_name :: The face's style name. This is an ASCII */ /* string, usually in English, which describes */ /* the typeface's style (like `Italic', */ /* `Bold', `Condensed', etc). Not all font */ /* formats provide a style name, so this field */ /* is optional, and can be set to NULL. As */ /* for `family_name', some formats provide */ /* localized/Unicode versions of this string. */ /* Applications should use the format specific */ /* interface to access them. */ /* */ /* num_fixed_sizes :: The number of fixed sizes available in this */ /* face. This should be set to 0 for scalable */ /* fonts, unless its resource includes a */ /* complete set of glyphs (called a `strike') */ /* for the specified size. */ /* */ /* available_sizes :: An array of sizes specifying the available */ /* bitmap/graymap sizes that are contained in */ /* in the font resource. Should be set to */ /* NULL if the field `num_fixed_sizes' is set */ /* to 0. */ /* */ /* num_charmaps :: The total number of character maps in the */ /* face. */ /* */ /* charmaps :: A table of pointers to the face's charmaps */ /* Used to scan the list of available charmaps */ /* this table might change after a call to */ /* FT_Attach_File/Stream (e.g. when it used */ /* to hook and additional encoding/CMap to */ /* the face object). */ /* */ /* generic :: A field reserved for client uses. See the */ /* FT_Generic type description. */ /* */ /* bbox :: The font bounding box. Coordinates are */ /* expressed in font units (see units_per_EM). */ /* The box is large enough to contain any */ /* glyph from the font. Thus, bbox.yMax can */ /* be seen as the `maximal ascender', */ /* bbox.yMin as the `minimal descender', and */ /* the maximal glyph width is given by */ /* `bbox.xMax-bbox.xMin' (not to be confused */ /* with the maximal _advance_width_). Only */ /* relevant for scalable formats. */ /* */ /* units_per_EM :: The number of font units per EM square for */ /* this face. This is typically 2048 for */ /* TrueType fonts, 1000 for Type1 fonts, and */ /* should be set to the (unrealistic) value 1 */ /* for fixed-sizes fonts. Only relevant for */ /* scalable formats. */ /* */ /* ascender :: The face's ascender is the vertical */ /* distance from the baseline to the topmost */ /* point of any glyph in the face. This */ /* field's value is positive, expressed in */ /* font units. Some font designs use a value */ /* different from `bbox.yMax'. Only relevant */ /* for scalable formats. */ /* */ /* descender :: The face's descender is the vertical */ /* distance from the baseline to the */ /* bottommost point of any glyph in the face. */ /* This field's value is positive, expressed */ /* in font units. Some font designs use a */ /* value different from `-bbox.yMin'. Only */ /* relevant for scalable formats. */ /* */ /* height :: The face's height is the vertical distance */ /* from one baseline to the next when writing */ /* several lines of text. Its value is always */ /* positive, expressed in font units. The */ /* value can be computed as */ /* `ascender+descender+line_gap' where the */ /* value of `line_gap' is also called */ /* `external leading'. Only relevant for */ /* scalable formats. */ /* */ /* max_advance_width :: The maximal advance width, in font units, */ /* for all glyphs in this face. This can be */ /* used to make word wrapping computations */ /* faster. Only relevant for scalable */ /* formats. */ /* */ /* max_advance_height :: The maximal advance height, in font units, */ /* for all glyphs in this face. This is only */ /* relevant for vertical layouts, and should */ /* be set to the `height' for fonts that do */ /* not provide vertical metrics. Only */ /* relevant for scalable formats. */ /* */ /* underline_position :: The position, in font units, of the */ /* underline line for this face. It's the */ /* center of the underlining stem. Only */ /* relevant for scalable formats. */ /* */ /* underline_thickness :: The thickness, in font units, of the */ /* underline for this face. Only relevant for */ /* scalable formats. */ /* */ /* driver :: A handle to the face's parent driver */ /* object. */ /* */ /* memory :: A handle to the face's parent memory */ /* object. Used for the allocation of */ /* subsequent objects. */ /* */ /* stream :: A handle to the face's stream. */ /* */ /* glyph :: The face's associated glyph slot(s). This */ /* object is created automatically with a new */ /* face object. However, certain kinds of */ /* applications (mainly tools like converters) */ /* can need more than one slot to ease their */ /* task. */ /* */ /* sizes_list :: The list of child sizes for this face. */ /* */ /* max_points :: The maximal number of points used to store */ /* the vectorial outline of any glyph in this */ /* face. If this value cannot be known in */ /* advance, or if the face isn't scalable, */ /* this should be set to 0. Only relevant for */ /* scalable formats. */ /* */ /* max_contours :: The maximal number of contours used to */ /* store the vectorial outline of any glyph in */ /* this face. If this value cannot be known */ /* in advance, or if the face isn't scalable, */ /* this should be set to 0. Only relevant for */ /* scalable formats. */ /* */ /* transform_matrix :: a 2x2 matrix of 16.16 coefficients used */ /* to transform glyph outlines after they're */ /* loaded from the font. Only used by the */ /* convenience functions. */ /* */ /* transform_delta :: a translation vector used to transform */ /* glyph outlines after they're loaded from */ /* the font. Only used by the convenience */ /* functions. */ /* */ /* transform_flags :: some flags used to classify the transform. */ /* Only used by the convenience functions. */ /* */ typedef struct FT_FaceRec_ { FT_Long num_faces; FT_Long face_index; FT_Long face_flags; FT_Long style_flags; FT_Long num_glyphs; FT_String* family_name; FT_String* style_name; FT_Int num_fixed_sizes; FT_Bitmap_Size* available_sizes; /* the face's table of available charmaps */ FT_Int num_charmaps; FT_CharMap* charmaps; FT_Generic generic; /* the following are only relevant for scalable outlines */ FT_BBox bbox; FT_UShort units_per_EM; FT_Short ascender; FT_Short descender; FT_Short height; FT_Short max_advance_width; FT_Short max_advance_height; FT_Short underline_position; FT_Short underline_thickness; FT_GlyphSlot glyph; FT_Size size; /************************************************************/ /* The following fields should be considered private and */ /* rarely, if ever, used driectly by client applications.. */ FT_Driver driver; FT_Memory memory; FT_Stream stream; FT_CharMap charmap; FT_ListRec sizes_list; FT_Generic autohint; void* extensions; FT_UShort max_points; FT_Short max_contours; FT_Matrix transform_matrix; FT_Vector transform_delta; FT_Int transform_flags; } FT_FaceRec; /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_SCALABLE */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_FIXED_WIDTH */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_FIXED_WIDTH */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_SFNT */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_HORIZONTAL */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_VERTICAL */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_KERNING */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_FAST_GLYPHS */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_MULTIPLE_MASTERS */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_FACE_FLAG_EXTERNAL_STREAM */ /* */ /* */ /* This bit field is used internally by FreeType to indicate that */ /* a face's stream was provided by the client application and should */ /* not be destroyed by FT_Done_Face */ /* */ #define FT_FACE_FLAG_EXTERNAL_STREAM 0x4000 #define FT_HAS_HORIZONTAL(face) (face->face_flags & FT_FACE_FLAG_HORIZONTAL) #define FT_HAS_VERTICAL(face) (face->face_flags & FT_FACE_FLAG_VERTICAL) #define FT_HAS_KERNING(face) (face->face_flags & FT_FACE_FLAG_KERNING) #define FT_IS_SCALABLE(face) (face->face_flags & FT_FACE_FLAG_SCALABLE) #define FT_IS_SFNT(face) (face->face_flags & FT_FACE_FLAG_SFNT) #define FT_IS_FIXED_WIDTH(face) (face->face_flags & FT_FACE_FLAG_FIXED_WIDTH) #define FT_HAS_FIXED_SIZES(face) (face->face_flags & FT_FACE_FLAG_FIXED_SIZES) #define FT_HAS_FAST_GLYPHS(face) (face->face_flags & FT_FACE_FLAG_FAST_GLYPHS) #define FT_HAS_MULTIPLE_MASTERS(face) \ (face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS) /*************************************************************************/ /* */ /* */ /* FT_STYLE_FLAG_ITALIC */ /* */ /* */ /* A bit-field constant, used to indicate that a given face is */ /* italicized. */ /* */ #define FT_STYLE_FLAG_ITALIC 1 /*************************************************************************/ /* */ /* */ /* FT_STYLE_FLAG_BOLD */ /* */ /* */ /* A bit-field constant, used to indicate that a given face is */ /* emboldened. */ /* */ #define FT_STYLE_FLAG_BOLD 2 /*************************************************************************/ /* */ /* FreeType base size metrics */ /* */ /* */ /* FT_Size_Metrics */ /* */ /* */ /* The size metrics structure returned scaled important distances for */ /* a given size object. */ /* */ /* */ /* 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. */ /* */ /* */ /* The values of "ascender", "descender" and "height" are only the */ /* scaled versions of "face->ascender", "face->descender" and */ /* "face->height". */ /* */ /* Unfortunately, due to glyph hinting, these values might not be */ /* exact for certain fonts, they thus must be treated as unreliable */ /* with an error margin of at least one pixel !! */ /* */ /* Indeed, the only way to get the exact pixel ascender and descender */ /* is to render _all_ glyphs. As this would be a definite performance */ /* hit, it's up to client applications to perform such computations.. */ /* */ typedef struct FT_Size_Metrics_ { FT_UShort x_ppem; /* horizontal pixels per EM */ FT_UShort y_ppem; /* vertical pixels per EM */ FT_Fixed x_scale; /* two scales used to convert font units */ FT_Fixed y_scale; /* to 26.6 frac. pixel coordinates.. */ FT_Pos ascender; /* ascender in 26.6 frac. pixels */ FT_Pos descender; /* descender in 26.6 frac. pixels */ FT_Pos height; /* text height in 26.6 frac. pixels */ FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */ } FT_Size_Metrics; /*************************************************************************/ /* */ /* FreeType base size class */ /* */ /* */ /* FT_SizeRec */ /* */ /* */ /* FreeType root size class structure. A size object models the */ /* resolution and pointsize dependent data of a given face. */ /* */ /* */ /* 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 /********************************************************************** * * * FT_Glyph_Loader * * * The glyph loader is an internal object used to load several * glyphs together (for example, in the case of composites) * * * the glyph loader implementation is not part of the high-level * API, hence the forward structure declaration; * * *********************************************************************/ typedef struct FT_GlyphLoader_ FT_GlyphLoader; /*************************************************************************/ /* */ /* FreeType Glyph Slot base class */ /* */ /* */ /* FT_GlyphSlotRec */ /* */ /* */ /* FreeType root glyph slot class structure. A glyph slot is a */ /* container where individual glyphs can be loaded, be they */ /* vectorial or bitmap/graymaps.. */ /* */ /* */ /* library :: a handle to the FreeType library instance this slot */ /* belongs to. */ /* */ /* face :: A handle to the parent face object. */ /* */ /* next :: In some cases (like some font tools), several glyph */ /* slots per face object can be a good thing. As this is */ /* rare, the glyph slots are listed through a direct, */ /* single-linked list using its `next' field. */ /* */ /* generic :: A typeless pointer which is unused by the FreeType */ /* library or any of its drivers. It can be used by */ /* client applications to link their own data to each */ /* size object. */ /* */ /* metrics :: The metrics of the last loaded glyph in the slot. The */ /* returned values depend on the last load flags (see the */ /* FT_Load_Glyph() API function) and can be expressed */ /* either in 26.6 fractional pixels or font units. */ /* */ /* Note that even when the glyph image is transformed, */ /* the metrics aren't.. */ /* */ /* 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_UNSCALED_LINEAR 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 */ /* & 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 */ /* when 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 */ /* when it's 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 */ /* 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 format 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, */ /* */ /* loader :: this is a private object for the glyph slot. Do */ /* not touch this.. */ /* */ /* */ /* When FT_Load_Glyph is called with default flags (FT_LOAD_DEFAULT), */ /* the glyph image is loaded in the glyph slot in its native format */ /* (e.g. a vectorial outline for TrueType and Type 1 formats) */ /* */ /* This image can later be converted into a bitmap by calling */ /* FT_Render_Glyph. This function finds the current renderer for the */ /* native image's format then invokes it. */ /* */ /* The renderer is in charge of transforming the native image through */ /* the slot's face transformation fields, then convert it into a */ /* bitmap that is returned in "slot->bitmap". */ /* */ /* Note that "slot->bitmap_left" and "slot->bitmap_top" are also */ /* used to specify the position of the bitmap relative to the current */ /* pen position (e.g. coordinates [0,0] on the baseline). Of course, */ /* "slot->format" is also changed to "ft_glyph_format_bitmap".. */ /* */ /* */ enum { ft_glyph_own_bitmap = 1 }; 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; /* private fields */ FT_GlyphLoader* loader; } FT_GlyphSlotRec; /*************************************************************************/ /*************************************************************************/ /* */ /* F U N C T I O N S */ /* */ /*************************************************************************/ /*************************************************************************/ /*************************************************************************/ /* */ /* */ /* FT_Init_FreeType */ /* */ /* */ /* Initializes a new FreeType library object. The set of drivers */ /* that are registered by this function is determined at build time. */ /* */ /* */ /* library :: A handle to a new library object. */ /* */ /* */ /* Error code. 0 means success. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Init_FreeType( FT_Library* library ); /*************************************************************************/ /* */ /* */ /* FT_Done_FreeType */ /* */ /* */ /* Destroys a given FreeType library object, and all of its childs, */ /* including resources, drivers, faces, sizes, etc. */ /* */ /* */ /* library :: A handle to a target library object. */ /* */ /* */ /* Error code. 0 means success. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Done_FreeType( FT_Library library ); /*************************************************************************/ /* */ /* */ /* FT_Open_Flags */ /* */ /* */ /* An enumeration used to list the bit flags used within FT_Open_Args */ /* */ /* */ /* ft_open_memory :: this is a memory-based stream */ /* ft_open_stream :: copy the stream from the "stream" field */ /* ft_open_pathname :: create a new input stream from a C pathname */ /* ft_open_driver :: use the "driver" field */ /* ft_open_params :: use the "num_params" & "params" field */ /* */ typedef enum { ft_open_memory = 1, ft_open_stream = 2, ft_open_pathname = 4, ft_open_driver = 8, ft_open_params = 16 } FT_Open_Flags; /*************************************************************************/ /* */ /* */ /* FT_Parameter */ /* */ /* */ /* A simple structure used to pass more or less generic parameters */ /* to FT_Open_Face.. */ /* */ /* */ /* tag :: 4-byte identification tag */ /* data :: pointer to parameter data */ /* */ /* */ /* the id and role of parameters is driver-specific */ /* */ typedef struct FT_Parameter_ { FT_ULong tag; FT_Pointer data; } FT_Parameter; /************************************************************************* * * * FT_Open_Args * * * 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. * * * flags :: set of bit flags indicating how to use the structure * * memory_base :: first byte of file in memory * memory_size :: size in bytes of file in memory * * pathname :: a pointer to an 8-bit file pathname * * stream :: handle to a source stream object * * driver :: this field is exclusively used by FT_Open_Face, * it simply specifies the font driver to use to open * the face. If set to 0, FreeType will try to load * the face with each one of the drivers in its list. * * num_params :: number of parameters * params :: extra parameters passed to the font driver when * opening a new face * * * The stream_type determines which fields are used to create a new * input stream. * * If it is ft_stream_memory, a new memory-based stream will be created * using the memory block specified by "memory_base" and "memory_size" * * If it is ft_stream_pathname, a new stream will be created with the * "pathname" field, calling the system-specific FT_New_Stream function * * It is is ft_stream_copy, then the content of "stream" will be copied * to a new input stream object. The object will be closed and destroyed * when the face is destroyed itself.. Note that this means that you * should not close the stream before the library does !! * *************************************************************************/ typedef struct FT_Open_Args_ { FT_Open_Flags flags; FT_Byte* memory_base; FT_Long memory_size; FT_String* pathname; FT_Stream stream; FT_Module driver; FT_Int num_params; FT_Parameter* params; } FT_Open_Args; /*************************************************************************/ /* */ /* */ /* FT_New_Face */ /* */ /* */ /* Creates a new face object from a given font file and typeface */ /* index. */ /* */ /* */ /* 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. */ /* */ /* face :: A handle to a new face object. */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* If your font file is in memory, or if you want to provide your */ /* own input stream object, see FT_Open_Face below. */ /* */ /* FT_New_Face creates a new stream object. The stream will be */ /* closed with the face (when calling FT_Done_Face or even */ /* FT_Done_FreeType). */ /* */ /* Unlike FreeType 1.1, this function automatically creates a glyph */ /* slot for the face object which can be accessed directly through */ /* `face->slot'. Note that additional slots can be added to each face */ /* through the FT_New_GlyphSlot() API function. Slots are linked in */ /* a single list through their `next' field. */ /* */ FT_EXPORT_DEF(FT_Error) FT_New_Face( FT_Library library, const char* filepathname, FT_Long face_index, FT_Face* face ); /*************************************************************************/ /* */ /* */ /* FT_New_Memory_Face */ /* */ /* */ /* Creates a new face object from a given resource and typeface index */ /* using a font file already loaded into memory. */ /* */ /* */ /* library :: A handle to the library resource. */ /* */ /* */ /* 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. */ /* */ /* face :: A handle to a new face object. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* Unlike FreeType 1.x, this function automatically creates a glyph */ /* slot for the face object which can be accessed directly through */ /* `face->glyph'. */ /* */ /* Note that additional slots can be added to each face with the */ /* FT_New_GlyphSlot() API function. Slots are linked in a single */ /* list through their `next' field. */ /* */ /* FT_New_Memory_Face() can be used to determine and/or check the */ /* font format of a given font resource. If the `face_index' field */ /* is negative, the function will _not_ return any face handle in */ /* `*face'. Its return value should be 0 if the resource is */ /* recognized, or non-zero if not. */ /* */ FT_EXPORT_DEF(FT_Error) FT_New_Memory_Face( FT_Library library, void* file_base, FT_Long file_size, FT_Long face_index, FT_Face* face ); /*************************************************************************/ /* */ /* */ /* FT_Open_Face */ /* */ /* */ /* 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.. */ /* */ /* */ /* 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. */ /* */ /* face :: A handle to a new face object. */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* Note that if the stream is in-memory or specified through an */ /* 8-bit pathname, a new stream is created by this function. It */ /* is only closed when the face is destroyed (FT_Done_Face). */ /* */ /* Note that when specifying directly an existing FT_Stream, this */ /* function creates a new FT_Stream object and copies the contents */ /* of the original stream within it. The stream will be closed */ /* when the face is destroyed. This means calling the stream's */ /* "close" function. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Open_Face( FT_Library library, FT_Open_Args* args, FT_Long face_index, FT_Face* face ); /*************************************************************************/ /* */ /* */ /* FT_Attach_File */ /* */ /* */ /* "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.. */ /* */ /* */ /* face :: target face object */ /* */ /* filepathname :: an 8-bit pathname naming the 'metrics' file. */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* If your font file is in memory, or if you want to provide your */ /* own input stream object, see FT_Attach_Stream. */ /* */ /* The meaning of the "attach" (i.e. what really happens when the */ /* new file is read) is not fixed by FreeType itself. It really */ /* depends on the font format (and thus the font driver). */ /* */ /* Client applications are expected to know what they're doing */ /* when invoking this function. Most drivers simply do not implement */ /* file attachments.. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Attach_File( FT_Face face, const char* filepathname ); /*************************************************************************/ /* */ /* */ /* FT_Attach_Stream */ /* */ /* */ /* This function is similar to FT_Attach_File with the exception */ /* that it reads the attachment from an arbitrary stream. */ /* */ /* */ /* face :: target face object */ /* */ /* args :: a pointer to an FT_Open_Args structure used to describe */ /* the input stream to FreeType */ /* */ /* Error code. 0 means success. */ /* */ /* The meaning of the "attach" (i.e. what really happens when the */ /* new file is read) is not fixed by FreeType itself. It really */ /* depends on the font format (and thus the font driver). */ /* */ /* Client applications are expected to know what they're doing */ /* when invoking this function. Most drivers simply do not implement */ /* file attachments.. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Attach_Stream( FT_Face face, FT_Open_Args* parameters ); /*************************************************************************/ /* */ /* */ /* FT_Done_Face */ /* */ /* */ /* Discards a given face object, as well as all of its child slots */ /* and sizes. */ /* */ /* */ /* face :: A handle to a target face object. */ /* */ /* */ /* Error code. 0 means success. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Done_Face( FT_Face face ); /*************************************************************************/ /* */ /* */ /* FT_Set_Char_Size */ /* */ /* */ /* 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. */ /* */ /* */ /* size :: A handle to a target size object. */ /* char_size :: The character size, in 26.6 fractional points. */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* When dealing with fixed-size faces (i.e., non-scalable formats), */ /* use the function FT_Set_Pixel_Sizes(). */ /* */ FT_EXPORT_DEF(FT_Error) FT_Set_Char_Size( FT_Face face, FT_F26Dot6 char_width, FT_F26Dot6 char_height, FT_UInt horz_resolution, FT_UInt vert_resolution ); /*************************************************************************/ /* */ /* */ /* FT_Set_Pixel_Sizes */ /* */ /* */ /* Sets the character dimensions of a given size object. The width */ /* and height are expressed in integer pixels. */ /* */ /* */ /* size :: A handle to a target size object. */ /* pixel_width :: The character width, in integer pixels. */ /* pixel_height :: The character height, in integer pixels. */ /* */ /* */ /* Error code. 0 means success. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Set_Pixel_Sizes( FT_Face face, FT_UInt pixel_width, FT_UInt pixel_height ); /*************************************************************************/ /* */ /* */ /* FT_Load_Glyph */ /* */ /* */ /* A function used to load a single glyph within a given glyph slot, */ /* for a given size. */ /* */ /* */ /* 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). */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* 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_DEF(FT_Error) FT_Load_Glyph( FT_Face face, FT_UInt glyph_index, FT_Int load_flags ); /*************************************************************************/ /* */ /* */ /* FT_Load_Char */ /* */ /* */ /* A function used to load a single glyph within a given glyph slot, */ /* for a given size, according to its character code ! */ /* */ /* */ /* 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). */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* 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_DEF(FT_Error) FT_Load_Char( FT_Face face, FT_ULong char_code, FT_Int load_flags ); /*************************************************************************/ /* */ /* */ /* FT_LOAD_NO_SCALE */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_NO_HINTING */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_RENDER */ /* */ /* */ /* 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, when 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_NO_BITMAP */ /* */ /* */ /* 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 renderer through FT_Render_Glyph */ /* */ #define FT_LOAD_NO_BITMAP 8 /*************************************************************************/ /* */ /* */ /* FT_LOAD_VERTICAL_LAYOUT */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_FORCE_AUTOHINT */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_CROP_BITMAP */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_PEDANTIC */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_NO_RECURSE */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_IGNORE_TRANSFORM */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_ANTI_ALIAS */ /* */ /* */ /* Only used with FT_LOAD_RENDER set, indicates that the returned */ /* glyph image should be anti-aliased. This basically tells the */ /* glyph loader to use 'ft_render_mode_antialias' when calling */ /* FT_Render_Glyph. */ /* */ /* THIS IS NOW 0, AS ANTI-ALIASED RENDERING IS NOW THE DEFAULT.. */ /* */ #define FT_LOAD_ANTI_ALIAS 0 /* this is the default */ /*************************************************************************/ /* */ /* */ /* FT_LOAD_MONOCHROME */ /* */ /* */ /* Only used with FT_LOAD_RENDER set, 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_LINEAR_DESIGN */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_LOAD_DEFAULT */ /* */ /* */ /* 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 /*************************************************************************/ /* */ /* */ /* FT_Set_Transform */ /* */ /* */ /* A function used to set the transformation that is applied to glyph */ /* images just before they're converted to bitmaps in a glyph slot */ /* when FT_Render_Glyph is called.. */ /* */ /* */ /* face :: A handle to the source face object. */ /* */ /* */ /* 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. */ /* */ /* */ /* The transformation is only applied to scalable image formats. */ /* */ /* The transformation is simply applied to the glyph after it is */ /* loaded. It means that hinting is unaltered by the transform and */ /* is performed on the character size given in the last call to */ /* FT_Set_Char_Sizes or FT_Set_Pixel_Sizes */ /* */ FT_EXPORT_DEF( void ) FT_Set_Transform( FT_Face face, FT_Matrix* matrix, FT_Vector* delta ); /************************************************************************* * * * FT_Render_Mode * * * 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.. * * * 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 * * * There is no render mode to produce 8-bit "monochrome" bitmaps, * you'll 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; /************************************************************************* * * * FT_Render_Glyph * * * Converts a given glyph image to a bitmap. It does so by inspecting * the glyph image format, find the relevant renderer, and invoke it * * * slot :: handle to the glyph slot containing the image to * convert * * render_mode :: this is the render mode used to render the glyph image * into a bitmap. See FT_Render_Mode for possible values. * * * Error code. 0 means success. * *************************************************************************/ FT_EXPORT_DEF(FT_Error) FT_Render_Glyph( FT_GlyphSlot slot, FT_UInt render_mode ); /************************************************************************** * * * FT_Kerning_Mode * * * A list of enumerations used to specify which kerning values to * return in FT_Get_Kerning * * * ft_kerning_default :: used to returned scaled and grid-fitted kerning * distances. (value is 0) * * ft_kerning_unfitted :: used to returned scaled by un-grid-fitted * kerning distances. * * ft_kerning_unscaled :: used to 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; /*************************************************************************/ /* */ /* */ /* FT_Get_Kerning */ /* */ /* */ /* Returns the kerning vector between two glyphs of a same face. */ /* */ /* */ /* 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 info. Determines the */ /* scale/dimension of the returned kerning vector */ /* */ /* */ /* kerning :: The kerning vector. This is in font units for */ /* scalable formats, and in pixels for fixed-sizes */ /* formats. */ /* */ /* */ /* FreeType error code. 0 means success. */ /* */ /* */ /* Only horizontal layouts (left-to-right & right-to-left) are */ /* supported by this method. Other layouts, or more sophisticated */ /* kernings, are out of the scope of this API function -- they can be */ /* implemented through format-specific interfaces. */ /* */ FT_EXPORT_DEF(FT_Error) FT_Get_Kerning( FT_Face face, FT_UInt left_glyph, FT_UInt right_glyph, FT_UInt kern_mode, FT_Vector* kerning ); /*************************************************************************/ /* */ /* */ /* FT_Select_Charmap */ /* */ /* */ /* Selects a given charmap by its encoding tag. */ /* */ /* */ /* face :: A handle to the source face object. */ /* encoding :: handle to the selected charmap */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* This function will return an error if no charmap in the face */ /* corresponds to the encoding queried here */ /* */ FT_EXPORT_DEF(FT_Error) FT_Select_Charmap( FT_Face face, FT_Encoding encoding ); /*************************************************************************/ /* */ /* */ /* FT_Set_Charmap */ /* */ /* */ /* Selects a given charmap for character code to glyph index */ /* decoding. */ /* */ /* */ /* face :: A handle to the source face object. */ /* charmap :: handle to the selected charmap */ /* */ /* */ /* Error code. 0 means success. */ /* */ /* */ /* this function will return an error when the charmap is not part */ /* of the face (i.e. if it is not listed in the face->charmaps[] */ /* table). */ /* */ FT_EXPORT_DEF(FT_Error) FT_Set_Charmap( FT_Face face, FT_CharMap charmap ); /*************************************************************************/ /* */ /* */ /* FT_Get_Char_Index */ /* */ /* */ /* Returns the glyph index of a given character code. This function */ /* uses a charmap object to do the translation. */ /* */ /* */ /* charmap :: A handle to a filter charmap object. */ /* charcode :: The character code. */ /* */ /* */ /* The glyph index. 0 means `undefined character code'. */ /* */ FT_EXPORT_DEF(FT_UInt) FT_Get_Char_Index( FT_Face face, FT_ULong charcode ); /*************************************************************************/ /* */ /* */ /* FT_MulDiv */ /* */ /* */ /* 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. */ /* */ /* */ /* a :: The first multiplier. */ /* b :: The second multiplier. */ /* c :: The divisor. */ /* */ /* */ /* The result of `(a*b)/c'. This function never traps when trying to */ /* divide by zero, it simply returns `MaxInt' or `MinInt' depending */ /* on the signs of `a' and `b'. */ /* */ FT_EXPORT_DEF(FT_Long) FT_MulDiv( FT_Long a, FT_Long b, FT_Long c ); /*************************************************************************/ /* */ /* */ /* FT_MulFix */ /* */ /* */ /* 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. */ /* */ /* */ /* a :: The first multiplier. */ /* b :: The second multiplier. Use a 16.16 factor here whenever */ /* possible (see note below). */ /* */ /* */ /* The result of `(a*b)/0x10000'. */ /* */ /* */ /* This function has been optimized for the case where the absolute */ /* value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */ /* As this happens mainly when scaling from notional units to */ /* fractional pixels in FreeType, it resulted in noticeable speed */ /* improvements between versions 2.0 and 1.x. */ /* */ /* As a conclusion, always try to place a 16.16 factor as the */ /* _second_ argument of this function; this can make a great */ /* difference. */ /* */ FT_EXPORT_DEF(FT_Long) FT_MulFix( FT_Long a, FT_Long b ); /*************************************************************************/ /* */ /* */ /* FT_DivFix */ /* */ /* */ /* 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. */ /* */ /* */ /* a :: The first multiplier. */ /* b :: The second multiplier. Use a 16.16 factor here whenever */ /* possible (see note below). */ /* */ /* */ /* The result of `(a*0x10000)/b'. */ /* */ /* */ /* The optimisation for FT_DivFix() is simple : if (a << 16) fits */ /* in 32 bits, then the division is computed directly. Otherwise, */ /* we use a specialised version of the old FT_MulDiv64 */ /* */ FT_EXPORT_DEF(FT_Long) FT_DivFix( FT_Long a, FT_Long b ); /*************************************************************************/ /* */ /* */ /* FT_Vector_Transform */ /* */ /* */ /* Transforms a single vector through a 2x2 matrix. */ /* */ /* */ /* vector :: The target vector to transform */ /* */ /* */ /* matrix :: A pointer to the source 2x2 matrix. */ /* */ /* */ /* Yes. */ /* */ FT_EXPORT_DEF(void) FT_Vector_Transform( FT_Vector* vector, FT_Matrix* matrix ); #ifdef __cplusplus } #endif #endif /* FREETYPE_H */ /* END */