| /**************************************************************************** |
| * |
| * freetype.h |
| * |
| * FreeType high-level API and common types (specification only). |
| * |
| * Copyright 1996-2018 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_ |
| |
| |
| #ifndef FT_FREETYPE_H |
| #error "`ft2build.h' hasn't been included yet!" |
| #error "Please always use macros to include FreeType header files." |
| #error "Example:" |
| #error " #include <ft2build.h>" |
| #error " #include FT_FREETYPE_H" |
| #endif |
| |
| |
| #include <ft2build.h> |
| #include FT_CONFIG_CONFIG_H |
| #include FT_TYPES_H |
| #include FT_ERRORS_H |
| |
| |
| FT_BEGIN_HEADER |
| |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * header_inclusion |
| * |
| * @title: |
| * FreeType's header inclusion scheme |
| * |
| * @abstract: |
| * How client applications should include FreeType header files. |
| * |
| * @description: |
| * To be as flexible as possible (and for historical reasons), |
| * FreeType uses a very special inclusion scheme to load header |
| * files, for example |
| * |
| * { |
| * #include <ft2build.h> |
| * |
| * #include FT_FREETYPE_H |
| * #include FT_OUTLINE_H |
| * } |
| * |
| * A compiler and its preprocessor only needs an include path to find |
| * the file `ft2build.h'; the exact locations and names of the other |
| * FreeType header files are hidden by @header_file_macros, loaded by |
| * `ft2build.h'. The API documentation always gives the header macro |
| * name needed for a particular function. |
| * |
| */ |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * user_allocation |
| * |
| * @title: |
| * User allocation |
| * |
| * @abstract: |
| * How client applications should allocate FreeType data structures. |
| * |
| * @description: |
| * FreeType assumes that structures allocated by the user and passed |
| * as arguments are zeroed out except for the actual data. In other |
| * words, it is recommended to use `calloc' (or variants of it) |
| * instead of `malloc' for allocation. |
| * |
| */ |
| |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /* */ |
| /* 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 most important public high-level API |
| * functions of FreeType~2. |
| * |
| * @order: |
| * FT_Library |
| * FT_Face |
| * FT_Size |
| * FT_GlyphSlot |
| * FT_CharMap |
| * FT_Encoding |
| * FT_ENC_TAG |
| * |
| * 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_COLOR |
| * FT_FACE_FLAG_SFNT |
| * FT_FACE_FLAG_CID_KEYED |
| * FT_FACE_FLAG_TRICKY |
| * FT_FACE_FLAG_KERNING |
| * FT_FACE_FLAG_MULTIPLE_MASTERS |
| * FT_FACE_FLAG_VARIATION |
| * FT_FACE_FLAG_GLYPH_NAMES |
| * FT_FACE_FLAG_EXTERNAL_STREAM |
| * FT_FACE_FLAG_HINTER |
| * |
| * FT_HAS_HORIZONTAL |
| * FT_HAS_VERTICAL |
| * FT_HAS_KERNING |
| * FT_HAS_FIXED_SIZES |
| * FT_HAS_GLYPH_NAMES |
| * FT_HAS_COLOR |
| * FT_HAS_MULTIPLE_MASTERS |
| * |
| * FT_IS_SFNT |
| * FT_IS_SCALABLE |
| * FT_IS_FIXED_WIDTH |
| * FT_IS_CID_KEYED |
| * FT_IS_TRICKY |
| * FT_IS_NAMED_INSTANCE |
| * FT_IS_VARIATION |
| * |
| * 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_Reference_Face |
| * FT_New_Memory_Face |
| * FT_Face_Properties |
| * FT_Open_Face |
| * FT_Open_Args |
| * FT_Parameter |
| * FT_Attach_File |
| * FT_Attach_Stream |
| * |
| * FT_Set_Char_Size |
| * FT_Set_Pixel_Sizes |
| * FT_Request_Size |
| * FT_Select_Size |
| * FT_Size_Request_Type |
| * FT_Size_RequestRec |
| * FT_Size_Request |
| * FT_Set_Transform |
| * FT_Load_Glyph |
| * FT_Get_Char_Index |
| * FT_Get_First_Char |
| * FT_Get_Next_Char |
| * FT_Get_Name_Index |
| * FT_Load_Char |
| * |
| * FT_OPEN_MEMORY |
| * FT_OPEN_STREAM |
| * FT_OPEN_PATHNAME |
| * FT_OPEN_DRIVER |
| * FT_OPEN_PARAMS |
| * |
| * 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_NO_AUTOHINT |
| * FT_LOAD_COLOR |
| * |
| * FT_LOAD_VERTICAL_LAYOUT |
| * FT_LOAD_IGNORE_TRANSFORM |
| * FT_LOAD_FORCE_AUTOHINT |
| * FT_LOAD_NO_RECURSE |
| * FT_LOAD_PEDANTIC |
| * |
| * FT_LOAD_TARGET_NORMAL |
| * FT_LOAD_TARGET_LIGHT |
| * FT_LOAD_TARGET_MONO |
| * FT_LOAD_TARGET_LCD |
| * FT_LOAD_TARGET_LCD_V |
| * |
| * FT_LOAD_TARGET_MODE |
| * |
| * FT_Render_Glyph |
| * FT_Render_Mode |
| * FT_Get_Kerning |
| * FT_Kerning_Mode |
| * FT_Get_Track_Kerning |
| * FT_Get_Glyph_Name |
| * FT_Get_Postscript_Name |
| * |
| * FT_CharMapRec |
| * FT_Select_Charmap |
| * FT_Set_Charmap |
| * FT_Get_Charmap_Index |
| * |
| * FT_Get_FSType_Flags |
| * FT_Get_SubGlyph_Info |
| * |
| * FT_Face_Internal |
| * FT_Size_Internal |
| * FT_Slot_Internal |
| * |
| * FT_FACE_FLAG_XXX |
| * FT_STYLE_FLAG_XXX |
| * FT_OPEN_XXX |
| * FT_LOAD_XXX |
| * FT_LOAD_TARGET_XXX |
| * FT_SUBGLYPH_FLAG_XXX |
| * FT_FSTYPE_XXX |
| * |
| * FT_HAS_FAST_GLYPHS |
| * |
| */ |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Glyph_Metrics |
| * |
| * @description: |
| * A structure to model the metrics of a single glyph. The values |
| * are expressed in 26.6 fractional pixel format; if the flag |
| * @FT_LOAD_NO_SCALE has been used while loading the glyph, values |
| * are expressed in font units instead. |
| * |
| * @fields: |
| * width :: |
| * The glyph's width. |
| * |
| * height :: |
| * The glyph's height. |
| * |
| * horiBearingX :: |
| * Left side bearing for horizontal layout. |
| * |
| * horiBearingY :: |
| * Top side bearing for horizontal layout. |
| * |
| * horiAdvance :: |
| * Advance width for horizontal layout. |
| * |
| * vertBearingX :: |
| * Left side bearing for vertical layout. |
| * |
| * vertBearingY :: |
| * Top side bearing for vertical layout. Larger positive values |
| * mean further below the vertical glyph origin. |
| * |
| * vertAdvance :: |
| * Advance height for vertical layout. Positive values mean the |
| * glyph has a positive advance downward. |
| * |
| * @note: |
| * If not disabled with @FT_LOAD_NO_HINTING, the values represent |
| * dimensions of the hinted glyph (in case hinting is applicable). |
| * |
| * Stroking a glyph with an outside border does not increase |
| * `horiAdvance' or `vertAdvance'; you have to manually adjust these |
| * values to account for the added width and height. |
| * |
| * FreeType doesn't use the `VORG' table data for CFF fonts because |
| * it doesn't have an interface to quickly retrieve the glyph height. |
| * The y~coordinate of the vertical origin can be simply computed as |
| * `vertBearingY + height' after loading a glyph. |
| */ |
| typedef struct FT_Glyph_Metrics_ |
| { |
| FT_Pos width; |
| FT_Pos height; |
| |
| FT_Pos horiBearingX; |
| FT_Pos horiBearingY; |
| FT_Pos horiAdvance; |
| |
| FT_Pos vertBearingX; |
| FT_Pos vertBearingY; |
| FT_Pos vertAdvance; |
| |
| } FT_Glyph_Metrics; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Bitmap_Size |
| * |
| * @description: |
| * This structure models the metrics of a bitmap strike (i.e., a set |
| * of glyphs for a given point size and resolution) in a bitmap font. |
| * It is used for the `available_sizes' field of @FT_Face. |
| * |
| * @fields: |
| * height :: |
| * The vertical distance, in pixels, between two |
| * consecutive baselines. It is always positive. |
| * |
| * width :: |
| * The average width, in pixels, of all glyphs in the |
| * strike. |
| * |
| * size :: |
| * The nominal size of the strike in 26.6 fractional |
| * points. This field is not very useful. |
| * |
| * x_ppem :: |
| * The horizontal ppem (nominal width) in 26.6 fractional |
| * pixels. |
| * |
| * y_ppem :: |
| * The vertical ppem (nominal height) in 26.6 fractional |
| * pixels. |
| * |
| * @note: |
| * Windows FNT: |
| * The nominal size given in a FNT font is not reliable. If the |
| * driver finds it incorrect, it sets `size' to some calculated |
| * values, and `x_ppem' and `y_ppem' to the pixel width and height |
| * given in the font, respectively. |
| * |
| * TrueType embedded bitmaps: |
| * `size', `width', and `height' values are not contained in the |
| * bitmap strike itself. They are computed from the global font |
| * parameters. |
| */ |
| typedef struct FT_Bitmap_Size_ |
| { |
| FT_Short height; |
| FT_Short width; |
| |
| FT_Pos size; |
| |
| FT_Pos x_ppem; |
| FT_Pos y_ppem; |
| |
| } 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 memory manager (see @FT_Memory), as well as a |
| * scan-line converter object (see @FT_Raster). |
| * |
| * In multi-threaded applications it is easiest to use one |
| * `FT_Library' object per thread. In case this is too cumbersome, |
| * a single `FT_Library' object across threads is possible also |
| * (since FreeType version 2.5.6), as long as a mutex lock is used |
| * around @FT_New_Face and @FT_Done_Face. |
| * |
| * @note: |
| * Library objects are normally created by @FT_Init_FreeType, and |
| * destroyed with @FT_Done_FreeType. If you need reference-counting |
| * (cf. @FT_Reference_Library), use @FT_New_Library and |
| * @FT_Done_Library. |
| */ |
| typedef struct FT_LibraryRec_ *FT_Library; |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * module_management |
| * |
| */ |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_Module |
| * |
| * @description: |
| * A handle to a given FreeType module object. A module can be a |
| * font driver, a renderer, or anything else that provides services |
| * to the former. |
| */ |
| typedef struct FT_ModuleRec_* FT_Module; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_Driver |
| * |
| * @description: |
| * A handle to a given FreeType font driver object. A font driver |
| * is a module capable of creating faces from font files. |
| */ |
| typedef struct FT_DriverRec_* FT_Driver; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_Renderer |
| * |
| * @description: |
| * A handle to a given FreeType renderer. A renderer is a module in |
| * charge of converting a glyph's outline image to a bitmap. It |
| * supports a single glyph image format, and one or more target |
| * surface depths. |
| */ |
| typedef struct FT_RendererRec_* FT_Renderer; |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * base_interface |
| * |
| */ |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_Face |
| * |
| * @description: |
| * A handle to a typographic face object. A face object models a |
| * given typeface, in a given style. |
| * |
| * @note: |
| * A face object also owns a single @FT_GlyphSlot object, as well |
| * as one or more @FT_Size objects. |
| * |
| * Use @FT_New_Face or @FT_Open_Face to create a new face object from |
| * a given filepath or a custom input stream. |
| * |
| * Use @FT_Done_Face to destroy it (along with its slot and sizes). |
| * |
| * An `FT_Face' object can only be safely used from one thread at a |
| * time. Similarly, creation and destruction of `FT_Face' with the |
| * same @FT_Library object can only be done from one thread at a |
| * time. On the other hand, functions like @FT_Load_Glyph and its |
| * siblings are thread-safe and do not need the lock to be held as |
| * long as the same `FT_Face' object is not used from multiple |
| * threads at the same time. |
| * |
| * @also: |
| * See @FT_FaceRec for the publicly accessible fields of a given face |
| * object. |
| */ |
| typedef struct FT_FaceRec_* FT_Face; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_Size |
| * |
| * @description: |
| * A handle to an object that models a face scaled to a given |
| * character size. |
| * |
| * @note: |
| * An @FT_Face has one _active_ @FT_Size object that is used by |
| * functions like @FT_Load_Glyph to determine the scaling |
| * transformation that in turn is used to load and hint glyphs and |
| * metrics. |
| * |
| * You can use @FT_Set_Char_Size, @FT_Set_Pixel_Sizes, |
| * @FT_Request_Size or even @FT_Select_Size to change the content |
| * (i.e., the scaling values) of the active @FT_Size. |
| * |
| * You can use @FT_New_Size to create additional size objects for a |
| * given @FT_Face, but they won't be used by other functions until |
| * you activate it through @FT_Activate_Size. Only one size can be |
| * activated at any given time per face. |
| * |
| * @also: |
| * See @FT_SizeRec for the publicly accessible fields of a given size |
| * object. |
| */ |
| typedef struct FT_SizeRec_* FT_Size; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_GlyphSlot |
| * |
| * @description: |
| * A handle to a given `glyph slot'. A slot is a container that can |
| * hold any of the glyphs contained in its parent face. |
| * |
| * In other words, each time you call @FT_Load_Glyph or |
| * @FT_Load_Char, the slot's content is erased by the new glyph data, |
| * i.e., the glyph's metrics, its image (bitmap or outline), and |
| * other control information. |
| * |
| * @also: |
| * See @FT_GlyphSlotRec for the publicly accessible glyph fields. |
| */ |
| typedef struct FT_GlyphSlotRec_* FT_GlyphSlot; |
| |
| |
| /************************************************************************** |
| * |
| * @type: |
| * FT_CharMap |
| * |
| * @description: |
| * A handle to a character map (usually abbreviated to `charmap'). 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. |
| * |
| * Each face object owns zero or more charmaps, but only one of them |
| * can be `active', providing the data used by @FT_Get_Char_Index or |
| * @FT_Load_Char. |
| * |
| * The list of available charmaps in a face is available through the |
| * `face->num_charmaps' and `face->charmaps' fields of @FT_FaceRec. |
| * |
| * The currently active charmap is available as `face->charmap'. |
| * You should call @FT_Set_Charmap to change it. |
| * |
| * @note: |
| * When a new face is created (either through @FT_New_Face or |
| * @FT_Open_Face), the library looks for a Unicode charmap within |
| * the list and automatically activates it. If there is no Unicode |
| * charmap, FreeType doesn't set an `active' charmap. |
| * |
| * @also: |
| * See @FT_CharMapRec for the publicly accessible fields of a given |
| * character map. |
| */ |
| typedef struct FT_CharMapRec_* FT_CharMap; |
| |
| |
| /************************************************************************** |
| * |
| * @macro: |
| * FT_ENC_TAG |
| * |
| * @description: |
| * This macro converts four-letter tags into an unsigned long. It is |
| * used to define `encoding' identifiers (see @FT_Encoding). |
| * |
| * @note: |
| * Since many 16-bit compilers don't like 32-bit enumerations, you |
| * should redefine this macro in case of problems to something like |
| * this: |
| * |
| * { |
| * #define FT_ENC_TAG( value, a, b, c, d ) value |
| * } |
| * |
| * to get a simple enumeration without assigning special numbers. |
| */ |
| |
| #ifndef FT_ENC_TAG |
| #define FT_ENC_TAG( value, a, b, c, d ) \ |
| value = ( ( (FT_UInt32)(a) << 24 ) | \ |
| ( (FT_UInt32)(b) << 16 ) | \ |
| ( (FT_UInt32)(c) << 8 ) | \ |
| (FT_UInt32)(d) ) |
| |
| #endif /* FT_ENC_TAG */ |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_Encoding |
| * |
| * @description: |
| * An enumeration to specify character sets supported by charmaps. |
| * Used in the @FT_Select_Charmap API function. |
| * |
| * @note: |
| * Despite the name, this enumeration lists specific character |
| * repertories (i.e., charsets), and not text encoding methods (e.g., |
| * UTF-8, UTF-16, etc.). |
| * |
| * Other encodings might be defined in the future. |
| * |
| * @values: |
| * FT_ENCODING_NONE :: |
| * The encoding value~0 is reserved. |
| * |
| * FT_ENCODING_UNICODE :: |
| * The Unicode character set. This value covers all versions of |
| * the Unicode repertoire, including ASCII and Latin-1. Most fonts |
| * include a Unicode charmap, but not all of them. |
| * |
| * For example, if you want to access Unicode value U+1F028 (and |
| * the font contains it), use value 0x1F028 as the input value for |
| * @FT_Get_Char_Index. |
| * |
| * FT_ENCODING_MS_SYMBOL :: |
| * Microsoft Symbol encoding, used to encode mathematical symbols |
| * and wingdings. For more information, see |
| * `https://www.microsoft.com/typography/otspec/recom.htm', |
| * `http://www.kostis.net/charsets/symbol.htm', and |
| * `http://www.kostis.net/charsets/wingding.htm'. |
| * |
| * This encoding uses character codes from the PUA (Private Unicode |
| * Area) in the range U+F020-U+F0FF. |
| * |
| * FT_ENCODING_SJIS :: |
| * Shift JIS encoding for Japanese. More info at |
| * `https://en.wikipedia.org/wiki/Shift_JIS'. See note on |
| * multi-byte encodings below. |
| * |
| * FT_ENCODING_PRC :: |
| * Corresponds to encoding systems mainly for Simplified Chinese as |
| * used in People's Republic of China (PRC). The encoding layout |
| * is based on GB~2312 and its supersets GBK and GB~18030. |
| * |
| * FT_ENCODING_BIG5 :: |
| * Corresponds to an encoding system for Traditional Chinese as |
| * used in Taiwan and Hong Kong. |
| * |
| * FT_ENCODING_WANSUNG :: |
| * Corresponds to the Korean encoding system known as Extended |
| * Wansung (MS Windows code page 949). |
| * For more information see |
| * `https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit949.txt'. |
| * |
| * FT_ENCODING_JOHAB :: |
| * The Korean standard character set (KS~C 5601-1992), which |
| * corresponds to MS Windows code page 1361. This character set |
| * includes all possible Hangul character combinations. |
| * |
| * FT_ENCODING_ADOBE_LATIN_1 :: |
| * Corresponds to a Latin-1 encoding as defined in a Type~1 |
| * PostScript font. It is limited to 256 character codes. |
| * |
| * FT_ENCODING_ADOBE_STANDARD :: |
| * Adobe Standard encoding, as found in Type~1, CFF, and |
| * OpenType/CFF fonts. It is limited to 256 character codes. |
| * |
| * FT_ENCODING_ADOBE_EXPERT :: |
| * Adobe Expert encoding, as found in Type~1, CFF, and OpenType/CFF |
| * fonts. It is limited to 256 character codes. |
| * |
| * FT_ENCODING_ADOBE_CUSTOM :: |
| * Corresponds to a custom encoding, as found in Type~1, CFF, and |
| * OpenType/CFF fonts. It is limited to 256 character codes. |
| * |
| * FT_ENCODING_APPLE_ROMAN :: |
| * Apple roman encoding. Many TrueType and OpenType fonts contain |
| * a charmap for this 8-bit encoding, since older versions of Mac |
| * OS are able to use it. |
| * |
| * FT_ENCODING_OLD_LATIN_2 :: |
| * This value is deprecated and was neither used nor reported by |
| * FreeType. Don't use or test for it. |
| * |
| * FT_ENCODING_MS_SJIS :: |
| * Same as FT_ENCODING_SJIS. Deprecated. |
| * |
| * FT_ENCODING_MS_GB2312 :: |
| * Same as FT_ENCODING_PRC. Deprecated. |
| * |
| * FT_ENCODING_MS_BIG5 :: |
| * Same as FT_ENCODING_BIG5. Deprecated. |
| * |
| * FT_ENCODING_MS_WANSUNG :: |
| * Same as FT_ENCODING_WANSUNG. Deprecated. |
| * |
| * FT_ENCODING_MS_JOHAB :: |
| * Same as FT_ENCODING_JOHAB. Deprecated. |
| * |
| * @note: |
| * By default, FreeType enables a Unicode charmap and tags it with |
| * FT_ENCODING_UNICODE when it is either provided or can be generated |
| * from PostScript glyph name dictionaries in the font file. |
| * All other encodings are considered legacy and tagged only if |
| * explicitly defined in the font file. Otherwise, FT_ENCODING_NONE |
| * is used. |
| * |
| * FT_ENCODING_NONE is set by the BDF and PCF drivers if the charmap |
| * is neither Unicode nor ISO-8859-1 (otherwise it is set to |
| * FT_ENCODING_UNICODE). Use @FT_Get_BDF_Charset_ID to find out |
| * which encoding is really present. If, for example, the |
| * `cs_registry' field is `KOI8' and the `cs_encoding' field is `R', |
| * the font is encoded in KOI8-R. |
| * |
| * FT_ENCODING_NONE is always set (with a single exception) by the |
| * winfonts driver. Use @FT_Get_WinFNT_Header and examine the |
| * `charset' field of the @FT_WinFNT_HeaderRec structure to find out |
| * which encoding is really present. For example, |
| * @FT_WinFNT_ID_CP1251 (204) means Windows code page 1251 (for |
| * Russian). |
| * |
| * FT_ENCODING_NONE is set if `platform_id' is @TT_PLATFORM_MACINTOSH |
| * and `encoding_id' is not `TT_MAC_ID_ROMAN' (otherwise it is set to |
| * FT_ENCODING_APPLE_ROMAN). |
| * |
| * If `platform_id' is @TT_PLATFORM_MACINTOSH, use the function |
| * @FT_Get_CMap_Language_ID to query the Mac language ID that may |
| * be needed to be able to distinguish Apple encoding variants. See |
| * |
| * https://www.unicode.org/Public/MAPPINGS/VENDORS/APPLE/Readme.txt |
| * |
| * to get an idea how to do that. Basically, if the language ID |
| * is~0, don't use it, otherwise subtract 1 from the language ID. |
| * Then examine `encoding_id'. If, for example, `encoding_id' is |
| * `TT_MAC_ID_ROMAN' and the language ID (minus~1) is |
| * `TT_MAC_LANGID_GREEK', it is the Greek encoding, not Roman. |
| * `TT_MAC_ID_ARABIC' with `TT_MAC_LANGID_FARSI' means the Farsi |
| * variant the Arabic encoding. |
| */ |
| typedef enum FT_Encoding_ |
| { |
| FT_ENC_TAG( FT_ENCODING_NONE, 0, 0, 0, 0 ), |
| |
| FT_ENC_TAG( FT_ENCODING_MS_SYMBOL, 's', 'y', 'm', 'b' ), |
| FT_ENC_TAG( FT_ENCODING_UNICODE, 'u', 'n', 'i', 'c' ), |
| |
| FT_ENC_TAG( FT_ENCODING_SJIS, 's', 'j', 'i', 's' ), |
| FT_ENC_TAG( FT_ENCODING_PRC, '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' ), |
| |
| /* for backward compatibility */ |
| FT_ENCODING_GB2312 = FT_ENCODING_PRC, |
| FT_ENCODING_MS_SJIS = FT_ENCODING_SJIS, |
| FT_ENCODING_MS_GB2312 = FT_ENCODING_PRC, |
| FT_ENCODING_MS_BIG5 = FT_ENCODING_BIG5, |
| FT_ENCODING_MS_WANSUNG = FT_ENCODING_WANSUNG, |
| FT_ENCODING_MS_JOHAB = FT_ENCODING_JOHAB, |
| |
| 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_ADOBE_LATIN_1, 'l', 'a', 't', '1' ), |
| |
| FT_ENC_TAG( FT_ENCODING_OLD_LATIN_2, 'l', 'a', 't', '2' ), |
| |
| FT_ENC_TAG( FT_ENCODING_APPLE_ROMAN, 'a', 'r', 'm', 'n' ) |
| |
| } FT_Encoding; |
| |
| |
| /* these constants are deprecated; use the corresponding `FT_Encoding' */ |
| /* values instead */ |
| #define ft_encoding_none FT_ENCODING_NONE |
| #define ft_encoding_unicode FT_ENCODING_UNICODE |
| #define ft_encoding_symbol FT_ENCODING_MS_SYMBOL |
| #define ft_encoding_latin_1 FT_ENCODING_ADOBE_LATIN_1 |
| #define ft_encoding_latin_2 FT_ENCODING_OLD_LATIN_2 |
| #define ft_encoding_sjis FT_ENCODING_SJIS |
| #define ft_encoding_gb2312 FT_ENCODING_PRC |
| #define ft_encoding_big5 FT_ENCODING_BIG5 |
| #define ft_encoding_wansung FT_ENCODING_WANSUNG |
| #define ft_encoding_johab FT_ENCODING_JOHAB |
| |
| #define ft_encoding_adobe_standard FT_ENCODING_ADOBE_STANDARD |
| #define ft_encoding_adobe_expert FT_ENCODING_ADOBE_EXPERT |
| #define ft_encoding_adobe_custom FT_ENCODING_ADOBE_CUSTOM |
| #define ft_encoding_apple_roman FT_ENCODING_APPLE_ROMAN |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_CharMapRec |
| * |
| * @description: |
| * The base charmap structure. |
| * |
| * @fields: |
| * face :: |
| * A handle to the parent face object. |
| * |
| * encoding :: |
| * An @FT_Encoding tag identifying 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 gets emulated for |
| * other formats. |
| * |
| * encoding_id :: |
| * A platform-specific encoding number. This also comes from the |
| * TrueType specification and gets emulated similarly. |
| */ |
| 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 that models |
| * the private data of a given @FT_Face object. |
| * |
| * This structure might change between releases of FreeType~2 and is |
| * not generally available to client applications. |
| */ |
| typedef struct FT_Face_InternalRec_* FT_Face_Internal; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_FaceRec |
| * |
| * @description: |
| * FreeType root face class structure. A face object models a |
| * typeface in a font file. |
| * |
| * @fields: |
| * num_faces :: |
| * The number of faces in the font file. Some |
| * font formats can have multiple faces in |
| * a single font file. |
| * |
| * face_index :: |
| * This field holds two different values. |
| * Bits 0-15 are the index of the face in the |
| * font file (starting with value~0). They |
| * are set to~0 if there is only one face in |
| * the font file. |
| * |
| * [Since 2.6.1] Bits 16-30 are relevant to GX |
| * and OpenType variation fonts only, holding |
| * the named instance index for the current |
| * face index (starting with value~1; value~0 |
| * indicates font access without a named |
| * instance). For non-variation fonts, bits |
| * 16-30 are ignored. If we have the third |
| * named instance of face~4, say, `face_index' |
| * is set to 0x00030004. |
| * |
| * Bit 31 is always zero (this is, |
| * `face_index' is always a positive value). |
| * |
| * [Since 2.9] Changing the design coordinates |
| * with @FT_Set_Var_Design_Coordinates or |
| * @FT_Set_Var_Blend_Coordinates does not |
| * influence the named instance index value |
| * (only @FT_Set_Named_Instance does that). |
| * |
| * face_flags :: |
| * A set of bit flags that give important |
| * information about the face; see |
| * @FT_FACE_FLAG_XXX for the details. |
| * |
| * style_flags :: |
| * The lower 16~bits contain a set of bit |
| * flags indicating the style of the face; see |
| * @FT_STYLE_FLAG_XXX for the details. |
| * |
| * [Since 2.6.1] Bits 16-30 hold the number |
| * of named instances available for the |
| * current face if we have a GX or OpenType |
| * variation (sub)font. Bit 31 is always zero |
| * (this is, `style_flags' is always a |
| * positive value). Note that a variation |
| * font has always at least one named |
| * instance, namely the default instance. |
| * |
| * num_glyphs :: |
| * The number of glyphs in the face. If the |
| * face is scalable and has sbits (see |
| * `num_fixed_sizes'), it is set to the number |
| * of outline glyphs. |
| * |
| * For CID-keyed fonts (not in an SFNT |
| * wrapper) this value gives the highest CID |
| * used in the font. |
| * |
| * family_name :: |
| * The face's family name. This is an ASCII string, usually in |
| * English, that 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. Can be NULL (e.g., in fonts embedded in a PDF file). |
| * |
| * In case the font doesn't provide a specific |
| * family name entry, FreeType tries to |
| * synthesize one, deriving it from other name |
| * entries. |
| * |
| * style_name :: |
| * The face's style name. This is an ASCII string, usually in |
| * English, that 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 and Unicode versions |
| * of this string. Applications should use the format-specific |
| * interface to access them. |
| * |
| * num_fixed_sizes :: |
| * The number of bitmap strikes in the face. |
| * Even if the face is scalable, there might |
| * still be bitmap strikes, which are called |
| * `sbits' in that case. |
| * |
| * available_sizes :: |
| * An array of @FT_Bitmap_Size for all bitmap |
| * strikes in the face. It is set to NULL if |
| * there is no bitmap strike. |
| * |
| * Note that FreeType tries to sanitize the |
| * strike data since they are sometimes sloppy |
| * or incorrect, but this can easily fail. |
| * |
| * num_charmaps :: |
| * The number of charmaps in the face. |
| * |
| * charmaps :: |
| * An array of the charmaps of the face. |
| * |
| * 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 `maximum |
| * ascender', and `bbox.yMin' as the `minimum |
| * descender'. Only relevant for scalable |
| * formats. |
| * |
| * Note that the bounding box might be off by |
| * (at least) one pixel for hinted fonts. See |
| * @FT_Size_Metrics for further discussion. |
| * |
| * units_per_EM :: |
| * The number of font units per EM square for |
| * this face. This is typically 2048 for |
| * TrueType fonts, and 1000 for Type~1 fonts. |
| * Only relevant for scalable formats. |
| * |
| * ascender :: |
| * The typographic ascender of the face, |
| * expressed in font units. For font formats |
| * not having this information, it is set to |
| * `bbox.yMax'. Only relevant for scalable |
| * formats. |
| * |
| * descender :: |
| * The typographic descender of the face, |
| * expressed in font units. For font formats |
| * not having this information, it is set to |
| * `bbox.yMin'. Note that this field is |
| * negative for values below the baseline. |
| * Only relevant for scalable formats. |
| * |
| * height :: |
| * This value is the vertical distance |
| * between two consecutive baselines, |
| * expressed in font units. It is always |
| * positive. Only relevant for scalable |
| * formats. |
| * |
| * If you want the global glyph height, use |
| * `ascender - descender'. |
| * |
| * max_advance_width :: |
| * The maximum advance width, in font units, |
| * for all glyphs in this face. This can be |
| * used to make word wrapping computations |
| * faster. Only relevant for scalable |
| * formats. |
| * |
| * max_advance_height :: |
| * The maximum advance height, in font units, |
| * for all glyphs in this face. This is only |
| * relevant for vertical layouts, and is set |
| * to `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 is 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. |
| * |
| * glyph :: |
| * The face's associated glyph slot(s). |
| * |
| * size :: |
| * The current active size for this face. |
| * |
| * charmap :: |
| * The current active charmap for this face. |
| * |
| * @note: |
| * Fields may be changed after a call to @FT_Attach_File or |
| * @FT_Attach_Stream. |
| * |
| * For an OpenType variation font, the values of the following fields |
| * can change after a call to @FT_Set_Var_Design_Coordinates (and |
| * friends) if the font contains an `MVAR' table: `ascender', |
| * `descender', `height', `underline_position', and |
| * `underline_thickness'. |
| * |
| * Especially for TrueType fonts see also the documentation for |
| * @FT_Size_Metrics. |
| */ |
| 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 member variables (down to `underline_thickness') */ |
| /*# are only relevant to scalable outlines; cf. @FT_Bitmap_Size */ |
| /*# for bitmap fonts. */ |
| 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; /* face-specific auto-hinter data */ |
| void* extensions; /* unused */ |
| |
| FT_Face_Internal internal; |
| |
| /*@private end */ |
| |
| } FT_FaceRec; |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_FACE_FLAG_XXX |
| * |
| * @description: |
| * A list of bit flags used in the `face_flags' field of the |
| * @FT_FaceRec structure. They inform client applications of |
| * properties of the corresponding face. |
| * |
| * @values: |
| * FT_FACE_FLAG_SCALABLE :: |
| * The face contains outline glyphs. Note that a face can contain |
| * bitmap strikes also, i.e., a face can have both this flag and |
| * @FT_FACE_FLAG_FIXED_SIZES set. |
| * |
| * FT_FACE_FLAG_FIXED_SIZES :: |
| * The face contains bitmap strikes. See also the |
| * `num_fixed_sizes' and `available_sizes' fields of @FT_FaceRec. |
| * |
| * FT_FACE_FLAG_FIXED_WIDTH :: |
| * The face contains fixed-width characters (like Courier, Lucida, |
| * MonoType, etc.). |
| * |
| * FT_FACE_FLAG_SFNT :: |
| * The face uses the SFNT storage scheme. For now, this means |
| * TrueType and OpenType. |
| * |
| * FT_FACE_FLAG_HORIZONTAL :: |
| * The face contains horizontal glyph metrics. This should be set |
| * for all common formats. |
| * |
| * FT_FACE_FLAG_VERTICAL :: |
| * The face contains vertical glyph metrics. This is only |
| * available in some formats, not all of them. |
| * |
| * FT_FACE_FLAG_KERNING :: |
| * The face contains kerning information. If set, the kerning |
| * distance can be retrieved using the function @FT_Get_Kerning. |
| * Otherwise the function always return the vector (0,0). Note |
| * that FreeType doesn't handle kerning data from the SFNT `GPOS' |
| * table (as present in many OpenType fonts). |
| * |
| * FT_FACE_FLAG_FAST_GLYPHS :: |
| * THIS FLAG IS DEPRECATED. DO NOT USE OR TEST IT. |
| * |
| * FT_FACE_FLAG_MULTIPLE_MASTERS :: |
| * The face contains multiple masters and is capable of |
| * interpolating between them. Supported formats are Adobe MM, |
| * TrueType GX, and OpenType variation fonts. |
| * |
| * See section @multiple_masters for API details. |
| * |
| * FT_FACE_FLAG_GLYPH_NAMES :: |
| * The face contains glyph names, which can be retrieved using |
| * @FT_Get_Glyph_Name. Note that some TrueType fonts contain |
| * broken glyph name tables. Use the function |
| * @FT_Has_PS_Glyph_Names when needed. |
| * |
| * FT_FACE_FLAG_EXTERNAL_STREAM :: |
| * Used internally by FreeType to indicate that a face's stream was |
| * provided by the client application and should not be destroyed |
| * when @FT_Done_Face is called. Don't read or test this flag. |
| * |
| * FT_FACE_FLAG_HINTER :: |
| * The font driver has a hinting machine of its own. For example, |
| * with TrueType fonts, it makes sense to use data from the SFNT |
| * `gasp' table only if the native TrueType hinting engine (with |
| * the bytecode interpreter) is available and active. |
| * |
| * FT_FACE_FLAG_CID_KEYED :: |
| * The face is CID-keyed. In that case, the face is not accessed |
| * by glyph indices but by CID values. For subsetted CID-keyed |
| * fonts this has the consequence that not all index values are a |
| * valid argument to @FT_Load_Glyph. Only the CID values for which |
| * corresponding glyphs in the subsetted font exist make |
| * `FT_Load_Glyph' return successfully; in all other cases you get |
| * an `FT_Err_Invalid_Argument' error. |
| * |
| * Note that CID-keyed fonts that are in an SFNT wrapper (this is, |
| * all OpenType/CFF fonts) don't have this flag set since the |
| * glyphs are accessed in the normal way (using contiguous |
| * indices); the `CID-ness' isn't visible to the application. |
| * |
| * FT_FACE_FLAG_TRICKY :: |
| * The face is `tricky', this is, it always needs the font format's |
| * native hinting engine to get a reasonable result. A typical |
| * example is the old Chinese font `mingli.ttf' (but not |
| * `mingliu.ttc') that uses TrueType bytecode instructions to move |
| * and scale all of its subglyphs. |
| * |
| * It is not possible to auto-hint such fonts using |
| * @FT_LOAD_FORCE_AUTOHINT; it will also ignore |
| * @FT_LOAD_NO_HINTING. You have to set both @FT_LOAD_NO_HINTING |
| * and @FT_LOAD_NO_AUTOHINT to really disable hinting; however, you |
| * probably never want this except for demonstration purposes. |
| * |
| * Currently, there are about a dozen TrueType fonts in the list of |
| * tricky fonts; they are hard-coded in file `ttobjs.c'. |
| * |
| * FT_FACE_FLAG_COLOR :: |
| * [Since 2.5.1] The face has color glyph tables. See |
| * @FT_LOAD_COLOR for more information. |
| * |
| * FT_FACE_FLAG_VARIATION :: |
| * [Since 2.9] Set if the current face (or named instance) has been |
| * altered with @FT_Set_MM_Design_Coordinates, |
| * @FT_Set_Var_Design_Coordinates, or |
| * @FT_Set_Var_Blend_Coordinates. This flag is unset by a call to |
| * @FT_Set_Named_Instance. |
| */ |
| #define FT_FACE_FLAG_SCALABLE ( 1L << 0 ) |
| #define FT_FACE_FLAG_FIXED_SIZES ( 1L << 1 ) |
| #define FT_FACE_FLAG_FIXED_WIDTH ( 1L << 2 ) |
| #define FT_FACE_FLAG_SFNT ( 1L << 3 ) |
| #define FT_FACE_FLAG_HORIZONTAL ( 1L << 4 ) |
| #define FT_FACE_FLAG_VERTICAL ( 1L << 5 ) |
| #define FT_FACE_FLAG_KERNING ( 1L << 6 ) |
| #define FT_FACE_FLAG_FAST_GLYPHS ( 1L << 7 ) |
| #define FT_FACE_FLAG_MULTIPLE_MASTERS ( 1L << 8 ) |
| #define FT_FACE_FLAG_GLYPH_NAMES ( 1L << 9 ) |
| #define FT_FACE_FLAG_EXTERNAL_STREAM ( 1L << 10 ) |
| #define FT_FACE_FLAG_HINTER ( 1L << 11 ) |
| #define FT_FACE_FLAG_CID_KEYED ( 1L << 12 ) |
| #define FT_FACE_FLAG_TRICKY ( 1L << 13 ) |
| #define FT_FACE_FLAG_COLOR ( 1L << 14 ) |
| #define FT_FACE_FLAG_VARIATION ( 1L << 15 ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_HAS_HORIZONTAL |
| * |
| * @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 |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains real |
| * vertical metrics (and not only synthesized ones). |
| * |
| */ |
| #define FT_HAS_VERTICAL( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_VERTICAL ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_HAS_KERNING |
| * |
| * @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 |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains a scalable |
| * font face (true for TrueType, Type~1, Type~42, CID, OpenType/CFF, |
| * and PFR font formats). |
| * |
| */ |
| #define FT_IS_SCALABLE( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_SCALABLE ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_IS_SFNT |
| * |
| * @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 |
| * |
| * @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_HAS_FIXED_SIZES |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains some |
| * embedded bitmaps. See the `available_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 |
| * |
| * @description: |
| * Deprecated. |
| * |
| */ |
| #define FT_HAS_FAST_GLYPHS( face ) 0 |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_HAS_GLYPH_NAMES |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains some glyph |
| * names that can be accessed through @FT_Get_Glyph_Name. |
| * |
| */ |
| #define FT_HAS_GLYPH_NAMES( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_GLYPH_NAMES ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_HAS_MULTIPLE_MASTERS |
| * |
| * @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 ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_IS_NAMED_INSTANCE |
| * |
| * @description: |
| * A macro that returns true whenever a face object is a named instance |
| * of a GX or OpenType variation font. |
| * |
| * [Since 2.9] Changing the design coordinates with |
| * @FT_Set_Var_Design_Coordinates or @FT_Set_Var_Blend_Coordinates does |
| * not influence the return value of this macro (only |
| * @FT_Set_Named_Instance does that). |
| * |
| * @since: |
| * 2.7 |
| * |
| */ |
| #define FT_IS_NAMED_INSTANCE( face ) \ |
| ( (face)->face_index & 0x7FFF0000L ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_IS_VARIATION |
| * |
| * @description: |
| * A macro that returns true whenever a face object has been altered |
| * by @FT_Set_MM_Design_Coordinates, @FT_Set_Var_Design_Coordinates, or |
| * @FT_Set_Var_Blend_Coordinates. |
| * |
| * @since: |
| * 2.9 |
| * |
| */ |
| #define FT_IS_VARIATION( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_VARIATION ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_IS_CID_KEYED |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains a CID-keyed |
| * font. See the discussion of @FT_FACE_FLAG_CID_KEYED for more |
| * details. |
| * |
| * If this macro is true, all functions defined in @FT_CID_H are |
| * available. |
| * |
| */ |
| #define FT_IS_CID_KEYED( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_CID_KEYED ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_IS_TRICKY |
| * |
| * @description: |
| * A macro that returns true whenever a face represents a `tricky' font. |
| * See the discussion of @FT_FACE_FLAG_TRICKY for more details. |
| * |
| */ |
| #define FT_IS_TRICKY( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_TRICKY ) |
| |
| |
| /************************************************************************* |
| * |
| * @macro: |
| * FT_HAS_COLOR |
| * |
| * @description: |
| * A macro that returns true whenever a face object contains |
| * tables for color glyphs. |
| * |
| * @since: |
| * 2.5.1 |
| * |
| */ |
| #define FT_HAS_COLOR( face ) \ |
| ( (face)->face_flags & FT_FACE_FLAG_COLOR ) |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_STYLE_FLAG_XXX |
| * |
| * @description: |
| * A list of bit flags to indicate the style of a given face. These |
| * are used in the `style_flags' field of @FT_FaceRec. |
| * |
| * @values: |
| * FT_STYLE_FLAG_ITALIC :: |
| * The face style is italic or oblique. |
| * |
| * FT_STYLE_FLAG_BOLD :: |
| * The face is bold. |
| * |
| * @note: |
| * The style information as provided by FreeType is very basic. More |
| * details are beyond the scope and should be done on a higher level |
| * (for example, by analyzing various fields of the `OS/2' table in |
| * SFNT based fonts). |
| */ |
| #define FT_STYLE_FLAG_ITALIC ( 1 << 0 ) |
| #define FT_STYLE_FLAG_BOLD ( 1 << 1 ) |
| |
| |
| /************************************************************************** |
| * |
| * @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; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Size_Metrics |
| * |
| * @description: |
| * The size metrics structure gives the metrics of a size object. |
| * |
| * @fields: |
| * x_ppem :: |
| * The width of the scaled EM square in pixels, hence |
| * the term `ppem' (pixels per EM). It is also |
| * referred to as `nominal width'. |
| * |
| * y_ppem :: |
| * The height of the scaled EM square in pixels, |
| * hence the term `ppem' (pixels per EM). It is also |
| * referred to as `nominal height'. |
| * |
| * x_scale :: |
| * A 16.16 fractional scaling value to convert |
| * horizontal metrics from font units to 26.6 |
| * fractional pixels. Only relevant for scalable |
| * font formats. |
| * |
| * y_scale :: |
| * A 16.16 fractional scaling value to convert |
| * vertical metrics from font units to 26.6 |
| * fractional pixels. Only relevant for scalable |
| * font formats. |
| * |
| * ascender :: |
| * The ascender in 26.6 fractional pixels, rounded up |
| * to an integer value. See @FT_FaceRec for the |
| * details. |
| * |
| * descender :: |
| * The descender in 26.6 fractional pixels, rounded |
| * down to an integer value. See @FT_FaceRec for the |
| * details. |
| * |
| * height :: |
| * The height in 26.6 fractional pixels, rounded to |
| * an integer value. See @FT_FaceRec for the |
| * details. |
| * |
| * max_advance :: |
| * The maximum advance width in 26.6 fractional |
| * pixels, rounded to an integer value. See |
| * @FT_FaceRec for the details. |
| * |
| * @note: |
| * The scaling values, if relevant, are determined first during a |
| * size changing operation. The remaining fields are then set by the |
| * driver. For scalable formats, they are usually set to scaled |
| * values of the corresponding fields in @FT_FaceRec. Some values |
| * like ascender or descender are rounded for historical reasons; |
| * more precise values (for outline fonts) can be derived by scaling |
| * the corresponding @FT_FaceRec values manually, with code similar |
| * to the following. |
| * |
| * { |
| * scaled_ascender = FT_MulFix( face->ascender, |
| * size_metrics->y_scale ); |
| * } |
| * |
| * Note that due to glyph hinting and the selected rendering mode |
| * these values are usually not exact; consequently, they must be |
| * treated as unreliable with an error margin of at least one pixel! |
| * |
| * Indeed, the only way to get the exact metrics is to render _all_ |
| * glyphs. As this would be a definite performance hit, it is up to |
| * client applications to perform such computations. |
| * |
| * The `FT_Size_Metrics' structure is valid for bitmap fonts also. |
| * |
| * |
| * *TrueType* *fonts* *with* *native* *bytecode* *hinting* |
| * |
| * All applications that handle TrueType fonts with native hinting |
| * must be aware that TTFs expect different rounding of vertical font |
| * dimensions. The application has to cater for this, especially if |
| * it wants to rely on a TTF's vertical data (for example, to |
| * properly align box characters vertically). |
| * |
| * Only the application knows _in_ _advance_ that it is going to use |
| * native hinting for TTFs! FreeType, on the other hand, selects the |
| * hinting mode not at the time of creating an @FT_Size object but |
| * much later, namely while calling @FT_Load_Glyph. |
| * |
| * Here is some pseudo code that illustrates a possible solution. |
| * |
| * { |
| * font_format = FT_Get_Font_Format( face ); |
| * |
| * if ( !strcmp( font_format, "TrueType" ) && |
| * do_native_bytecode_hinting ) |
| * { |
| * ascender = ROUND( FT_MulFix( face->ascender, |
| * size_metrics->y_scale ) ); |
| * descender = ROUND( FT_MulFix( face->descender, |
| * size_metrics->y_scale ) ); |
| * } |
| * else |
| * { |
| * ascender = size_metrics->ascender; |
| * descender = size_metrics->descender; |
| * } |
| * |
| * height = size_metrics->height; |
| * max_advance = size_metrics->max_advance; |
| * } |
| */ |
| 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; /* scaling values used to convert font */ |
| FT_Fixed y_scale; /* units to 26.6 fractional pixels */ |
| |
| 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; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_SizeRec |
| * |
| * @description: |
| * FreeType root size class structure. A size object models a face |
| * object at a given size. |
| * |
| * @fields: |
| * face :: |
| * Handle to the parent face object. |
| * |
| * generic :: |
| * A typeless pointer, 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. |
| * |
| * You can however retrieve subglyph information with |
| * @FT_Get_SubGlyph_Info. |
| */ |
| typedef struct FT_SubGlyphRec_* 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; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_GlyphSlotRec |
| * |
| * @description: |
| * FreeType root glyph slot class structure. A glyph slot is a |
| * container where individual glyphs can be loaded, be they in |
| * outline or bitmap format. |
| * |
| * @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. |
| * |
| * glyph_index :: |
| * The glyph index passed as an argument to @FT_Load_Glyph while |
| * initializeing the glyph slot (since FreeType version 2.10). |
| * |
| * generic :: |
| * A typeless pointer 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 :: |
| * The advance width of the unhinted glyph. |
| * Its value is expressed in 16.16 fractional |
| * pixels, unless @FT_LOAD_LINEAR_DESIGN is set |
| * when loading the glyph. This field can be |
| * important to perform correct WYSIWYG layout. |
| * Only relevant for outline glyphs. |
| * |
| * linearVertAdvance :: |
| * The advance height of the unhinted glyph. |
| * Its value is expressed in 16.16 fractional |
| * pixels, unless @FT_LOAD_LINEAR_DESIGN is set |
| * when loading the glyph. This field can be |
| * important to perform correct WYSIWYG layout. |
| * Only relevant for outline glyphs. |
| * |
| * advance :: |
| * This shorthand is, depending on |
| * @FT_LOAD_IGNORE_TRANSFORM, the transformed |
| * (hinted) advance width for the glyph, in 26.6 |
| * fractional pixel format. As specified with |
| * @FT_LOAD_VERTICAL_LAYOUT, it uses either the |
| * `horiAdvance' or the `vertAdvance' value of |
| * `metrics' field. |
| * |
| * format :: |
| * This field indicates the format of the image |
| * contained in the glyph slot. Typically |
| * @FT_GLYPH_FORMAT_BITMAP, |
| * @FT_GLYPH_FORMAT_OUTLINE, or |
| * @FT_GLYPH_FORMAT_COMPOSITE, but other values |
| * are possible. |
| * |
| * bitmap :: |
| * This field is used as a bitmap descriptor. |
| * 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 :: |
| * The bitmap's left bearing expressed in |
| * integer pixels. |
| * |
| * bitmap_top :: |
| * The bitmap's top bearing expressed in integer |
| * pixels. 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_FORMAT_OUTLINE. Once a glyph is |
| * loaded, `outline' can be transformed, |
| * distorted, emboldened, etc. However, it must |
| * not be freed. |
| * |
| * num_subglyphs :: |
| * The number of subglyphs in a composite glyph. |
| * This field 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. Currently internal to |
| * FreeType. |
| * |
| * 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; it is |
| * currently internal to FreeType. |
| * |
| * control_len :: |
| * This is the length in bytes of the control |
| * data. Currently internal to FreeType. |
| * |
| * other :: |
| * Reserved. |
| * |
| * lsb_delta :: |
| * The difference between hinted and unhinted |
| * left side bearing while auto-hinting is |
| * active. Zero otherwise. |
| * |
| * rsb_delta :: |
| * The difference between hinted and unhinted |
| * right side bearing while auto-hinting is |
| * active. Zero otherwise. |
| * |
| * @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., an outline glyph for TrueType and Type~1 |
| * formats). [Since 2.9] The prospective bitmap metrics are |
| * calculated according to @FT_LOAD_TARGET_XXX and other flags even |
| * for the outline glyph, even if @FT_LOAD_RENDER is not set. |
| * |
| * This image can later be converted into a bitmap by calling |
| * @FT_Render_Glyph. This function searches 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 converting 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. |
| * |
| * Here is a small pseudo code fragment that shows how to use |
| * `lsb_delta' and `rsb_delta' to do fractional positioning of |
| * glyphs: |
| * |
| * { |
| * FT_GlyphSlot slot = face->glyph; |
| * FT_Pos origin_x = 0; |
| * |
| * |
| * for all glyphs do |
| * <load glyph with `FT_Load_Glyph'> |
| * |
| * FT_Outline_Translate( slot->outline, origin_x & 63, 0 ); |
| * |
| * <save glyph image, or render glyph, or ...> |
| * |
| * <compute kern between current and next glyph |
| * and add it to `origin_x'> |
| * |
| * origin_x += slot->advance.x; |
| * origin_x += slot->rsb_delta - slot->lsb_delta; |
| * endfor |
| * } |
| * |
| * Here is another small pseudo code fragment that shows how to use |
| * `lsb_delta' and `rsb_delta' to improve integer positioning of |
| * glyphs: |
| * |
| * { |
| * FT_GlyphSlot slot = face->glyph; |
| * FT_Pos origin_x = 0; |
| * FT_Pos prev_rsb_delta = 0; |
| * |
| * |
| * for all glyphs do |
| * <compute kern between current and previous glyph |
| * and add it to `origin_x'> |
| * |
| * <load glyph with `FT_Load_Glyph'> |
| * |
| * if ( prev_rsb_delta - slot->lsb_delta > 32 ) |
| * origin_x -= 64; |
| * else if ( prev_rsb_delta - slot->lsb_delta < -31 ) |
| * origin_x += 64; |
| * |
| * prev_rsb_delta = slot->rsb_delta; |
| * |
| * <save glyph image, or render glyph, or ...> |
| * |
| * origin_x += slot->advance.x; |
| * endfor |
| * } |
| * |
| * If you use strong auto-hinting, you *must* apply these delta |
| * values! Otherwise you will experience far too large inter-glyph |
| * spacing at small rendering sizes in most cases. Note that it |
| * doesn't harm to use the above code for other hinting modes also, |
| * since the delta values are zero then. |
| */ |
| typedef struct FT_GlyphSlotRec_ |
| { |
| FT_Library library; |
| FT_Face face; |
| FT_GlyphSlot next; |
| FT_UInt glyph_index; /* new in 2.10; was reserved previously */ |
| 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; |
| |
| FT_Pos lsb_delta; |
| FT_Pos rsb_delta; |
| |
| void* other; |
| |
| FT_Slot_Internal internal; |
| |
| } FT_GlyphSlotRec; |
| |
| |
| /*************************************************************************/ |
| /*************************************************************************/ |
| /* */ |
| /* F U N C T I O N S */ |
| /* */ |
| /*************************************************************************/ |
| /*************************************************************************/ |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Init_FreeType |
| * |
| * @description: |
| * Initialize a new FreeType library object. The set of modules |
| * 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. |
| * |
| * @note: |
| * In case you want to provide your own memory allocating routines, |
| * use @FT_New_Library instead, followed by a call to |
| * @FT_Add_Default_Modules (or a series of calls to @FT_Add_Module) |
| * and @FT_Set_Default_Properties. |
| * |
| * See the documentation of @FT_Library and @FT_Face for |
| * multi-threading issues. |
| * |
| * If you need reference-counting (cf. @FT_Reference_Library), use |
| * @FT_New_Library and @FT_Done_Library. |
| * |
| * If compilation option FT_CONFIG_OPTION_ENVIRONMENT_PROPERTIES is |
| * set, this function reads the `FREETYPE_PROPERTIES' environment |
| * variable to control driver properties. See section @properties |
| * for more. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Init_FreeType( FT_Library *alibrary ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Done_FreeType |
| * |
| * @description: |
| * Destroy a given FreeType library object and all of its children, |
| * 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_XXX |
| * |
| * @description: |
| * A list of bit field constants used within the `flags' field of the |
| * @FT_Open_Args structure. |
| * |
| * @values: |
| * 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~path |
| * name. |
| * |
| * FT_OPEN_DRIVER :: |
| * Use the `driver' field. |
| * |
| * FT_OPEN_PARAMS :: |
| * Use the `num_params' and `params' fields. |
| * |
| * @note: |
| * The `FT_OPEN_MEMORY', `FT_OPEN_STREAM', and `FT_OPEN_PATHNAME' |
| * flags are mutually exclusive. |
| */ |
| #define FT_OPEN_MEMORY 0x1 |
| #define FT_OPEN_STREAM 0x2 |
| #define FT_OPEN_PATHNAME 0x4 |
| #define FT_OPEN_DRIVER 0x8 |
| #define FT_OPEN_PARAMS 0x10 |
| |
| |
| /* these constants are deprecated; use the corresponding `FT_OPEN_XXX' */ |
| /* values instead */ |
| #define ft_open_memory FT_OPEN_MEMORY |
| #define ft_open_stream FT_OPEN_STREAM |
| #define ft_open_pathname FT_OPEN_PATHNAME |
| #define ft_open_driver FT_OPEN_DRIVER |
| #define ft_open_params FT_OPEN_PARAMS |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Parameter |
| * |
| * @description: |
| * A simple structure to pass more or less generic parameters to |
| * @FT_Open_Face and @FT_Face_Properties. |
| * |
| * @fields: |
| * tag :: |
| * A four-byte identification tag. |
| * |
| * data :: |
| * A pointer to the parameter data. |
| * |
| * @note: |
| * The ID and function of parameters are driver-specific. See |
| * section @parameter_tags for more information. |
| */ |
| typedef struct FT_Parameter_ |
| { |
| FT_ULong tag; |
| FT_Pointer data; |
| |
| } FT_Parameter; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Open_Args |
| * |
| * @description: |
| * A structure to indicate how to open a new font file or stream. A |
| * pointer to such a structure can be used as a parameter for the |
| * functions @FT_Open_Face and @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 for |
| * opening the face. If set to NULL, FreeType tries |
| * 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' that |
| * 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'. |
| * The data are not copied, and the client is responsible for |
| * releasing and destroying them _after_ the corresponding call to |
| * @FT_Done_Face. |
| * |
| * 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 only tries 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' is used. They are ignored otherwise. |
| * |
| * Ideally, both the `pathname' and `params' fields should be tagged |
| * as `const'; this is missing for API backward compatibility. In |
| * other words, applications should treat them as read-only. |
| */ |
| typedef struct FT_Open_Args_ |
| { |
| FT_UInt 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: |
| * Call @FT_Open_Face to open a font by its pathname. |
| * |
| * @inout: |
| * library :: |
| * A handle to the library resource. |
| * |
| * @input: |
| * pathname :: |
| * A path to the font file. |
| * |
| * face_index :: |
| * See @FT_Open_Face for a detailed description of this |
| * parameter. |
| * |
| * @output: |
| * aface :: |
| * A handle to a new face object. If `face_index' is |
| * greater than or equal to zero, it must be non-NULL. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * Use @FT_Done_Face to destroy the created @FT_Face object (along |
| * with its slot and sizes). |
| */ |
| 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: |
| * Call @FT_Open_Face to open a font that has been 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 :: |
| * See @FT_Open_Face for a detailed description of this |
| * parameter. |
| * |
| * @output: |
| * aface :: |
| * A handle to a new face object. If `face_index' is |
| * greater than or equal to zero, it must be non-NULL. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * You must not deallocate the memory before calling @FT_Done_Face. |
| */ |
| 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: |
| * Create a face object from a given resource described by |
| * @FT_Open_Args. |
| * |
| * @inout: |
| * library :: |
| * A handle to the library resource. |
| * |
| * @input: |
| * args :: |
| * A pointer to an `FT_Open_Args' structure that must |
| * be filled by the caller. |
| * |
| * face_index :: |
| * This field holds two different values. Bits 0-15 |
| * are the index of the face in the font file (starting |
| * with value~0). Set it to~0 if there is only one |
| * face in the font file. |
| * |
| * [Since 2.6.1] Bits 16-30 are relevant to GX and |
| * OpenType variation fonts only, specifying the named |
| * instance index for the current face index (starting |
| * with value~1; value~0 makes FreeType ignore named |
| * instances). For non-variation fonts, bits 16-30 are |
| * ignored. Assuming that you want to access the third |
| * named instance in face~4, `face_index' should be set |
| * to 0x00030004. If you want to access face~4 without |
| * variation handling, simply set `face_index' to |
| * value~4. |
| * |
| * `FT_Open_Face' and its siblings can be used to |
| * quickly check whether the font format of a given |
| * font resource is supported by FreeType. In general, |
| * if the `face_index' argument is negative, the |
| * function's return value is~0 if the font format is |
| * recognized, or non-zero otherwise. The function |
| * allocates a more or less empty face handle in |
| * `*aface' (if `aface' isn't NULL); the only two |
| * useful fields in this special case are |
| * `face->num_faces' and `face->style_flags'. For any |
| * negative value of `face_index', `face->num_faces' |
| * gives the number of faces within the font file. For |
| * the negative value `-(N+1)' (with `N' a non-negative |
| * 16-bit value), bits 16-30 in `face->style_flags' |
| * give the number of named instances in face `N' if we |
| * have a variation font (or zero otherwise). After |
| * examination, the returned @FT_Face structure should |
| * be deallocated with a call to @FT_Done_Face. |
| * |
| * @output: |
| * aface :: |
| * A handle to a new face object. If `face_index' is |
| * greater than or equal to zero, it must be non-NULL. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * Unlike FreeType 1.x, this function automatically creates a glyph |
| * slot for the face object that can be accessed directly through |
| * `face->glyph'. |
| * |
| * Each new face object created with this function also owns a |
| * default @FT_Size object, accessible as `face->size'. |
| * |
| * One @FT_Library instance can have multiple face objects, this is, |
| * @FT_Open_Face and its siblings can be called multiple times using |
| * the same `library' argument. |
| * |
| * See the discussion of reference counters in the description of |
| * @FT_Reference_Face. |
| * |
| * @example: |
| * To loop over all faces, use code similar to the following snippet |
| * (omitting the error handling). |
| * |
| * { |
| * ... |
| * FT_Face face; |
| * FT_Long i, num_faces; |
| * |
| * |
| * error = FT_Open_Face( library, args, -1, &face ); |
| * if ( error ) { ... } |
| * |
| * num_faces = face->num_faces; |
| * FT_Done_Face( face ); |
| * |
| * for ( i = 0; i < num_faces; i++ ) |
| * { |
| * ... |
| * error = FT_Open_Face( library, args, i, &face ); |
| * ... |
| * FT_Done_Face( face ); |
| * ... |
| * } |
| * } |
| * |
| * To loop over all valid values for `face_index', use something |
| * similar to the following snippet, again without error handling. |
| * The code accesses all faces immediately (thus only a single call |
| * of `FT_Open_Face' within the do-loop), with and without named |
| * instances. |
| * |
| * { |
| * ... |
| * FT_Face face; |
| * |
| * FT_Long num_faces = 0; |
| * FT_Long num_instances = 0; |
| * |
| * FT_Long face_idx = 0; |
| * FT_Long instance_idx = 0; |
| * |
| * |
| * do |
| * { |
| * FT_Long id = ( instance_idx << 16 ) + face_idx; |
| * |
| * |
| * error = FT_Open_Face( library, args, id, &face ); |
| * if ( error ) { ... } |
| * |
| * num_faces = face->num_faces; |
| * num_instances = face->style_flags >> 16; |
| * |
| * ... |
| * |
| * FT_Done_Face( face ); |
| * |
| * if ( instance_idx < num_instances ) |
| * instance_idx++; |
| * else |
| * { |
| * face_idx++; |
| * instance_idx = 0; |
| * } |
| * |
| * } while ( face_idx < num_faces ) |
| * } |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Open_Face( FT_Library library, |
| const FT_Open_Args* args, |
| FT_Long face_index, |
| FT_Face *aface ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Attach_File |
| * |
| * @description: |
| * Call @FT_Attach_Stream to attach a file. |
| * |
| * @inout: |
| * face :: |
| * The target face object. |
| * |
| * @input: |
| * filepathname :: |
| * The pathname. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Attach_File( FT_Face face, |
| const char* filepathname ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Attach_Stream |
| * |
| * @description: |
| * `Attach' data to a face object. Normally, this is used to read |
| * additional information for the face object. For example, you can |
| * attach an AFM file that comes with a Type~1 font to get the |
| * kerning values and other metrics. |
| * |
| * @inout: |
| * face :: |
| * The target face object. |
| * |
| * @input: |
| * parameters :: |
| * A pointer to @FT_Open_Args that must be filled by |
| * the caller. |
| * |
| * @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 or stream attachments. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Attach_Stream( FT_Face face, |
| FT_Open_Args* parameters ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Reference_Face |
| * |
| * @description: |
| * A counter gets initialized to~1 at the time an @FT_Face structure |
| * is created. This function increments the counter. @FT_Done_Face |
| * then only destroys a face if the counter is~1, otherwise it simply |
| * decrements the counter. |
| * |
| * This function helps in managing life-cycles of structures that |
| * reference @FT_Face objects. |
| * |
| * @input: |
| * face :: |
| * A handle to a target face object. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @since: |
| * 2.4.2 |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Reference_Face( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Done_Face |
| * |
| * @description: |
| * Discard 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. |
| * |
| * @note: |
| * See the discussion of reference counters in the description of |
| * @FT_Reference_Face. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Done_Face( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Select_Size |
| * |
| * @description: |
| * Select a bitmap strike. To be more precise, this function sets |
| * the scaling factors of the active @FT_Size object in a face so |
| * that bitmaps from this particular strike are taken by |
| * @FT_Load_Glyph and friends. |
| * |
| * @inout: |
| * face :: |
| * A handle to a target face object. |
| * |
| * @input: |
| * strike_index :: |
| * The index of the bitmap strike in the |
| * `available_sizes' field of @FT_FaceRec structure. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * For bitmaps embedded in outline fonts it is common that only a |
| * subset of the available glyphs at a given ppem value is available. |
| * FreeType silently uses outlines if there is no bitmap for a given |
| * glyph index. |
| * |
| * For GX and OpenType variation fonts, a bitmap strike makes sense |
| * only if the default instance is active (this is, no glyph |
| * variation takes place); otherwise, FreeType simply ignores bitmap |
| * strikes. The same is true for all named instances that are |
| * different from the default instance. |
| * |
| * Don't use this function if you are using the FreeType cache API. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Select_Size( FT_Face face, |
| FT_Int strike_index ); |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_Size_Request_Type |
| * |
| * @description: |
| * An enumeration type that lists the supported size request types, |
| * i.e., what input size (in font units) maps to the requested output |
| * size (in pixels, as computed from the arguments of |
| * @FT_Size_Request). |
| * |
| * @values: |
| * FT_SIZE_REQUEST_TYPE_NOMINAL :: |
| * The nominal size. The `units_per_EM' field of @FT_FaceRec is |
| * used to determine both scaling values. |
| * |
| * This is the standard scaling found in most applications. In |
| * particular, use this size request type for TrueType fonts if |
| * they provide optical scaling or something similar. Note, |
| * however, that `units_per_EM' is a rather abstract value which |
| * bears no relation to the actual size of the glyphs in a font. |
| * |
| * FT_SIZE_REQUEST_TYPE_REAL_DIM :: |
| * The real dimension. The sum of the `ascender' and (minus of) |
| * the `descender' fields of @FT_FaceRec is used to determine both |
| * scaling values. |
| * |
| * FT_SIZE_REQUEST_TYPE_BBOX :: |
| * The font bounding box. The width and height of the `bbox' field |
| * of @FT_FaceRec are used to determine the horizontal and vertical |
| * scaling value, respectively. |
| * |
| * FT_SIZE_REQUEST_TYPE_CELL :: |
| * The `max_advance_width' field of @FT_FaceRec is used to |
| * determine the horizontal scaling value; the vertical scaling |
| * value is determined the same way as |
| * @FT_SIZE_REQUEST_TYPE_REAL_DIM does. Finally, both scaling |
| * values are set to the smaller one. This type is useful if you |
| * want to specify the font size for, say, a window of a given |
| * dimension and 80x24 cells. |
| * |
| * FT_SIZE_REQUEST_TYPE_SCALES :: |
| * Specify the scaling values directly. |
| * |
| * @note: |
| * The above descriptions only apply to scalable formats. For bitmap |
| * formats, the behaviour is up to the driver. |
| * |
| * See the note section of @FT_Size_Metrics if you wonder how size |
| * requesting relates to scaling values. |
| */ |
| typedef enum FT_Size_Request_Type_ |
| { |
| FT_SIZE_REQUEST_TYPE_NOMINAL, |
| FT_SIZE_REQUEST_TYPE_REAL_DIM, |
| FT_SIZE_REQUEST_TYPE_BBOX, |
| FT_SIZE_REQUEST_TYPE_CELL, |
| FT_SIZE_REQUEST_TYPE_SCALES, |
| |
| FT_SIZE_REQUEST_TYPE_MAX |
| |
| } FT_Size_Request_Type; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Size_RequestRec |
| * |
| * @description: |
| * A structure to model a size request. |
| * |
| * @fields: |
| * type :: |
| * See @FT_Size_Request_Type. |
| * |
| * width :: |
| * The desired width, given as a 26.6 fractional |
| * point value (with 72pt = 1in). |
| * |
| * height :: |
| * The desired height, given as a 26.6 fractional |
| * point value (with 72pt = 1in). |
| * |
| * horiResolution :: |
| * The horizontal resolution (dpi, i.e., pixels per |
| * inch). If set to zero, `width' is treated as a |
| * 26.6 fractional *pixel* value, which gets |
| * internally rounded to an integer. |
| * |
| * vertResolution :: |
| * The vertical resolution (dpi, i.e., pixels per |
| * inch). If set to zero, `height' is treated as a |
| * 26.6 fractional *pixel* value, which gets |
| * internally rounded to an integer. |
| * |
| * @note: |
| * If `width' is zero, the horizontal scaling value is set equal |
| * to the vertical scaling value, and vice versa. |
| * |
| * If `type' is FT_SIZE_REQUEST_TYPE_SCALES, `width' and `height' are |
| * interpreted directly as 16.16 fractional scaling values, without |
| * any further modification, and both `horiResolution' and |
| * `vertResolution' are ignored. |
| */ |
| typedef struct FT_Size_RequestRec_ |
| { |
| FT_Size_Request_Type type; |
| FT_Long width; |
| FT_Long height; |
| FT_UInt horiResolution; |
| FT_UInt vertResolution; |
| |
| } FT_Size_RequestRec; |
| |
| |
| /************************************************************************** |
| * |
| * @struct: |
| * FT_Size_Request |
| * |
| * @description: |
| * A handle to a size request structure. |
| */ |
| typedef struct FT_Size_RequestRec_ *FT_Size_Request; |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Request_Size |
| * |
| * @description: |
| * Resize the scale of the active @FT_Size object in a face. |
| * |
| * @inout: |
| * face :: |
| * A handle to a target face object. |
| * |
| * @input: |
| * req :: |
| * A pointer to a @FT_Size_RequestRec. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * Although drivers may select the bitmap strike matching the |
| * request, you should not rely on this if you intend to select a |
| * particular bitmap strike. Use @FT_Select_Size instead in that |
| * case. |
| * |
| * The relation between the requested size and the resulting glyph |
| * size is dependent entirely on how the size is defined in the |
| * source face. The font designer chooses the final size of each |
| * glyph relative to this size. For more information refer to |
| * `https://www.freetype.org/freetype2/docs/glyphs/glyphs-2.html'. |
| * |
| * Contrary to @FT_Set_Char_Size, this function doesn't have special |
| * code to normalize zero-valued widths, heights, or resolutions |
| * (which lead to errors in most cases). |
| * |
| * Don't use this function if you are using the FreeType cache API. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Request_Size( FT_Face face, |
| FT_Size_Request req ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Set_Char_Size |
| * |
| * @description: |
| * Call @FT_Request_Size to request the nominal size (in points). |
| * |
| * @inout: |
| * face :: |
| * A handle to a target face object. |
| * |
| * @input: |
| * char_width :: |
| * The nominal width, in 26.6 fractional points. |
| * |
| * char_height :: |
| * The nominal height, in 26.6 fractional points. |
| * |
| * horz_resolution :: |
| * The horizontal resolution in dpi. |
| * |
| * vert_resolution :: |
| * The vertical resolution in dpi. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * While this function allows fractional points as input values, the |
| * resulting ppem value for the given resolution is always rounded to |
| * the nearest integer. |
| * |
| * If either the character width or height is zero, it is set equal |
| * to the other value. |
| * |
| * If either the horizontal or vertical resolution is zero, it is set |
| * equal to the other value. |
| * |
| * A character width or height smaller than 1pt is set to 1pt; if |
| * both resolution values are zero, they are set to 72dpi. |
| * |
| * Don't use this function if you are using the FreeType cache API. |
| */ |
| 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: |
| * Call @FT_Request_Size to request the nominal size (in pixels). |
| * |
| * @inout: |
| * face :: |
| * A handle to the target face object. |
| * |
| * @input: |
| * pixel_width :: |
| * The nominal width, in pixels. |
| * |
| * pixel_height :: |
| * The nominal height, in pixels. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * You should not rely on the resulting glyphs matching or being |
| * constrained to this pixel size. Refer to @FT_Request_Size to |
| * understand how requested sizes relate to actual sizes. |
| * |
| * Don't use this function if you are using the FreeType cache API. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Set_Pixel_Sizes( FT_Face face, |
| FT_UInt pixel_width, |
| FT_UInt pixel_height ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Load_Glyph |
| * |
| * @description: |
| * Load a glyph into the glyph slot of a face object. |
| * |
| * @inout: |
| * face :: |
| * A handle to the target face object where the glyph |
| * is loaded. |
| * |
| * @input: |
| * glyph_index :: |
| * The index of the glyph in the font file. For |
| * CID-keyed fonts (either in PS or in CFF format) |
| * this argument specifies the CID value. |
| * |
| * 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: |
| * The loaded glyph may be transformed. See @FT_Set_Transform for |
| * the details. |
| * |
| * For subsetted CID-keyed fonts, `FT_Err_Invalid_Argument' is |
| * returned for invalid CID values (this is, for CID values that |
| * don't have a corresponding glyph in the font). See the discussion |
| * of the @FT_FACE_FLAG_CID_KEYED flag for more details. |
| * |
| * If you receive `FT_Err_Glyph_Too_Big', try getting the glyph |
| * outline at EM size, then scale it manually and fill it as a |
| * graphics operation. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Load_Glyph( FT_Face face, |
| FT_UInt glyph_index, |
| FT_Int32 load_flags ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Load_Char |
| * |
| * @description: |
| * Load a glyph into the glyph slot of a face object, accessed by its |
| * character code. |
| * |
| * @inout: |
| * face :: |
| * A handle to a target face object where the glyph |
| * is 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: |
| * This function simply calls @FT_Get_Char_Index and @FT_Load_Glyph. |
| * |
| * Many fonts contain glyphs that can't be loaded by this function |
| * since its glyph indices are not listed in any of the font's |
| * charmaps. |
| * |
| * If no active cmap is set up (i.e., `face->charmap' is zero), the |
| * call to @FT_Get_Char_Index is omitted, and the function behaves |
| * identically to @FT_Load_Glyph. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Load_Char( FT_Face face, |
| FT_ULong char_code, |
| FT_Int32 load_flags ); |
| |
| |
| /************************************************************************* |
| * |
| * @enum: |
| * FT_LOAD_XXX |
| * |
| * @description: |
| * A list of bit field constants for @FT_Load_Glyph to indicate what |
| * kind of operations to perform during glyph loading. |
| * |
| * @values: |
| * FT_LOAD_DEFAULT :: |
| * Corresponding to~0, this value is used as the default glyph load |
| * operation. In this case, the following happens: |
| * |
| * 1. FreeType looks for a bitmap for the glyph corresponding to the |
| * face's current size. If one is found, the function returns. |
| * The bitmap data can be accessed from the glyph slot (see note |
| * below). |
| * |
| * 2. If no embedded bitmap is searched for or found, FreeType looks |
| * for a scalable outline. If one is found, it is loaded from |
| * the font file, scaled to device pixels, then `hinted' to the |
| * pixel grid in order to optimize it. The outline data can be |
| * accessed from the glyph slot (see note below). |
| * |
| * Note that by default the glyph loader doesn't render outlines into |
| * bitmaps. The following flags are used to modify this default |
| * behaviour to more specific and useful cases. |
| * |
| * FT_LOAD_NO_SCALE :: |
| * Don't scale the loaded outline glyph but keep it in font units. |
| * |
| * This flag implies @FT_LOAD_NO_HINTING and @FT_LOAD_NO_BITMAP, and |
| * unsets @FT_LOAD_RENDER. |
| * |
| * If the font is `tricky' (see @FT_FACE_FLAG_TRICKY for more), using |
| * FT_LOAD_NO_SCALE usually yields meaningless outlines because the |
| * subglyphs must be scaled and positioned with hinting instructions. |
| * This can be solved by loading the font without FT_LOAD_NO_SCALE and |
| * setting the character size to `font->units_per_EM'. |
| * |
| * FT_LOAD_NO_HINTING :: |
| * Disable hinting. This generally generates `blurrier' bitmap glyphs |
| * when the glyph are rendered in any of the anti-aliased modes. See |
| * also the note below. |
| * |
| * This flag is implied by @FT_LOAD_NO_SCALE. |
| * |
| * FT_LOAD_RENDER :: |
| * Call @FT_Render_Glyph after the glyph is loaded. By default, the |
| * glyph is rendered in @FT_RENDER_MODE_NORMAL mode. This can be |
| * overridden by @FT_LOAD_TARGET_XXX or @FT_LOAD_MONOCHROME. |
| * |
| * This flag is unset by @FT_LOAD_NO_SCALE. |
| * |
| * FT_LOAD_NO_BITMAP :: |
| * Ignore bitmap strikes when loading. Bitmap-only fonts ignore this |
| * flag. |
| * |
| * @FT_LOAD_NO_SCALE always sets this flag. |
| * |
| * FT_LOAD_VERTICAL_LAYOUT :: |
| * Load the glyph for vertical text layout. In particular, the |
| * `advance' value in the @FT_GlyphSlotRec structure is set to the |
| * `vertAdvance' value of the `metrics' field. |
| * |
| * In case @FT_HAS_VERTICAL doesn't return true, you shouldn't use |
| * this flag currently. Reason is that in this case vertical metrics |
| * get synthesized, and those values are not always consistent across |
| * various font formats. |
| * |
| * FT_LOAD_FORCE_AUTOHINT :: |
| * Prefer the auto-hinter over the font's native hinter. See also |
| * the note below. |
| * |
| * FT_LOAD_PEDANTIC :: |
| * Make the font driver perform pedantic verifications during glyph |
| * loading. This is mostly used to detect broken glyphs in fonts. |
| * By default, FreeType tries to handle broken fonts also. |
| * |
| * In particular, errors from the TrueType bytecode engine are not |
| * passed to the application if this flag is not set; this might |
| * result in partially hinted or distorted glyphs in case a glyph's |
| * bytecode is buggy. |
| * |
| * FT_LOAD_NO_RECURSE :: |
| * Don't load composite glyphs recursively. Instead, the font |
| * driver should set the `num_subglyph' and `subglyphs' values of |
| * the glyph slot accordingly, and set `glyph->format' to |
| * @FT_GLYPH_FORMAT_COMPOSITE. The description of subglyphs can |
| * then be accessed with @FT_Get_SubGlyph_Info. |
| * |
| * This flag implies @FT_LOAD_NO_SCALE and @FT_LOAD_IGNORE_TRANSFORM. |
| * |
| * FT_LOAD_IGNORE_TRANSFORM :: |
| * Ignore the transform matrix set by @FT_Set_Transform. |
| * |
| * FT_LOAD_MONOCHROME :: |
| * This flag is used with @FT_LOAD_RENDER to indicate that you want to |
| * render an outline glyph to a 1-bit monochrome bitmap glyph, with |
| * 8~pixels packed into each byte of the bitmap data. |
| * |
| * Note that this has no effect on the hinting algorithm used. You |
| * should rather use @FT_LOAD_TARGET_MONO so that the |
| * monochrome-optimized hinting algorithm is used. |
| * |
| * FT_LOAD_LINEAR_DESIGN :: |
| * Keep `linearHoriAdvance' and `linearVertAdvance' fields of |
| * @FT_GlyphSlotRec in font units. See @FT_GlyphSlotRec for |
| * details. |
| * |
| * FT_LOAD_NO_AUTOHINT :: |
| * Disable the auto-hinter. See also the note below. |
| * |
| * FT_LOAD_COLOR :: |
| * Load colored glyphs. There are slight differences depending on the |
| * font format. |
| * |
| * [Since 2.5] Load embedded color bitmap images. The resulting color |
| * bitmaps, if available, will have the @FT_PIXEL_MODE_BGRA format, |
| * with pre-multiplied color channels. If the flag is not set and |
| * color bitmaps are found, they are converted to 256-level gray |
| * bitmaps, using the @FT_PIXEL_MODE_GRAY format. |
| * |
| * [Since 2.10] If the glyph index contains an entry in the face's |
| * `COLR' table with a `CPAL' palette table (as defined in the |
| * OpenType specification), make @FT_Render_Glyph provide a default |
| * blending of the color glyph layers associated with the glyph index, |
| * using the same bitmap format as embedded color bitmap images. This |
| * is mainly for convenience; for full control of color layers use |
| * @FT_Get_Color_Glyph_Layer and FreeType's color functions like |
| * @FT_Palette_Select instead of setting FT_LOAD_COLOR for rendering |
| * so that the client application can handle blending by itself. |
| * |
| * FT_LOAD_COMPUTE_METRICS :: |
| * [Since 2.6.1] Compute glyph metrics from the glyph data, without |
| * the use of bundled metrics tables (for example, the `hdmx' table in |
| * TrueType fonts). This flag is mainly used by font validating or |
| * font editing applications, which need to ignore, verify, or edit |
| * those tables. |
| * |
| * Currently, this flag is only implemented for TrueType fonts. |
| * |
| * FT_LOAD_BITMAP_METRICS_ONLY :: |
| * [Since 2.7.1] Request loading of the metrics and bitmap image |
| * information of a (possibly embedded) bitmap glyph without |
| * allocating or copying the bitmap image data itself. No effect if |
| * the target glyph is not a bitmap image. |
| * |
| * This flag unsets @FT_LOAD_RENDER. |
| * |
| * FT_LOAD_CROP_BITMAP :: |
| * Ignored. Deprecated. |
| * |
| * FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH :: |
| * Ignored. Deprecated. |
| * |
| * @note: |
| * By default, hinting is enabled and the font's native hinter (see |
| * @FT_FACE_FLAG_HINTER) is preferred over the auto-hinter. You can |
| * disable hinting by setting @FT_LOAD_NO_HINTING or change the |
| * precedence by setting @FT_LOAD_FORCE_AUTOHINT. You can also set |
| * @FT_LOAD_NO_AUTOHINT in case you don't want the auto-hinter to be |
| * used at all. |
| * |
| * See the description of @FT_FACE_FLAG_TRICKY for a special exception |
| * (affecting only a handful of Asian fonts). |
| * |
| * Besides deciding which hinter to use, you can also decide which |
| * hinting algorithm to use. See @FT_LOAD_TARGET_XXX for details. |
| * |
| * Note that the auto-hinter needs a valid Unicode cmap (either a native |
| * one or synthesized by FreeType) for producing correct results. If a |
| * font provides an incorrect mapping (for example, assigning the |
| * character code U+005A, LATIN CAPITAL LETTER Z, to a glyph depicting a |
| * mathematical integral sign), the auto-hinter might produce useless |
| * results. |
| * |
| */ |
| #define FT_LOAD_DEFAULT 0x0 |
| #define FT_LOAD_NO_SCALE ( 1L << 0 ) |
| #define FT_LOAD_NO_HINTING ( 1L << 1 ) |
| #define FT_LOAD_RENDER ( 1L << 2 ) |
| #define FT_LOAD_NO_BITMAP ( 1L << 3 ) |
| #define FT_LOAD_VERTICAL_LAYOUT ( 1L << 4 ) |
| #define FT_LOAD_FORCE_AUTOHINT ( 1L << 5 ) |
| #define FT_LOAD_CROP_BITMAP ( 1L << 6 ) |
| #define FT_LOAD_PEDANTIC ( 1L << 7 ) |
| #define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH ( 1L << 9 ) |
| #define FT_LOAD_NO_RECURSE ( 1L << 10 ) |
| #define FT_LOAD_IGNORE_TRANSFORM ( 1L << 11 ) |
| #define FT_LOAD_MONOCHROME ( 1L << 12 ) |
| #define FT_LOAD_LINEAR_DESIGN ( 1L << 13 ) |
| #define FT_LOAD_NO_AUTOHINT ( 1L << 15 ) |
| /* Bits 16-19 are used by `FT_LOAD_TARGET_' */ |
| #define FT_LOAD_COLOR ( 1L << 20 ) |
| #define FT_LOAD_COMPUTE_METRICS ( 1L << 21 ) |
| #define FT_LOAD_BITMAP_METRICS_ONLY ( 1L << 22 ) |
| |
| /* */ |
| |
| /* used internally only by certain font drivers */ |
| #define FT_LOAD_ADVANCE_ONLY ( 1L << 8 ) |
| #define FT_LOAD_SBITS_ONLY ( 1L << 14 ) |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_LOAD_TARGET_XXX |
| * |
| * @description: |
| * A list of values to select a specific hinting algorithm for the |
| * hinter. You should OR one of these values to your `load_flags' |
| * when calling @FT_Load_Glyph. |
| * |
| * Note that a font's native hinters may ignore the hinting algorithm |
| * you have specified (e.g., the TrueType bytecode interpreter). You |
| * can set @FT_LOAD_FORCE_AUTOHINT to ensure that the auto-hinter is |
| * used. |
| * |
| * @values: |
| * FT_LOAD_TARGET_NORMAL :: |
| * The default hinting algorithm, optimized for standard gray-level |
| * rendering. For monochrome output, use @FT_LOAD_TARGET_MONO |
| * instead. |
| * |
| * FT_LOAD_TARGET_LIGHT :: |
| * A lighter hinting algorithm for gray-level modes. Many generated |
| * glyphs are fuzzier but better resemble their original shape. This |
| * is achieved by snapping glyphs to the pixel grid only vertically |
| * (Y-axis), as is done by FreeType's new CFF engine or Microsoft's |
| * ClearType font renderer. This preserves inter-glyph spacing in |
| * horizontal text. The snapping is done either by the native font |
| * driver, if the driver itself and the font support it, or by the |
| * auto-hinter. |
| * |
| * Advance widths are rounded to integer values; however, using the |
| * `lsb_delta' and `rsb_delta' fields of @FT_GlyphSlotRec, it is |
| * possible to get fractional advance widths for subpixel positioning |
| * (which is recommended to use). |
| * |
| * If configuration option AF_CONFIG_OPTION_TT_SIZE_METRICS is active, |
| * TrueType-like metrics are used to make this mode behave similarly |
| * as in unpatched FreeType versions between 2.4.6 and 2.7.1 |
| * (inclusive). |
| * |
| * FT_LOAD_TARGET_MONO :: |
| * Strong hinting algorithm that should only be used for monochrome |
| * output. The result is probably unpleasant if the glyph is rendered |
| * in non-monochrome modes. |
| * |
| * FT_LOAD_TARGET_LCD :: |
| * A variant of @FT_LOAD_TARGET_LIGHT optimized for horizontally |
| * decimated LCD displays. |
| * |
| * FT_LOAD_TARGET_LCD_V :: |
| * A variant of @FT_LOAD_TARGET_NORMAL optimized for vertically |
| * decimated LCD displays. |
| * |
| * @note: |
| * You should use only _one_ of the FT_LOAD_TARGET_XXX values in your |
| * `load_flags'. They can't be ORed. |
| * |
| * If @FT_LOAD_RENDER is also set, the glyph is rendered in the |
| * corresponding mode (i.e., the mode that matches the used algorithm |
| * best). An exception is FT_LOAD_TARGET_MONO since it implies |
| * @FT_LOAD_MONOCHROME. |
| * |
| * You can use a hinting algorithm that doesn't correspond to the same |
| * rendering mode. As an example, it is possible to use the `light' |
| * hinting algorithm and have the results rendered in horizontal LCD |
| * pixel mode, with code like |
| * |
| * { |
| * FT_Load_Glyph( face, glyph_index, |
| * load_flags | FT_LOAD_TARGET_LIGHT ); |
| * |
| * FT_Render_Glyph( face->glyph, FT_RENDER_MODE_LCD ); |
| * } |
| * |
| * In general, you should stick with one rendering mode. For example, |
| * switching between @FT_LOAD_TARGET_NORMAL and @FT_LOAD_TARGET_MONO |
| * enforces a lot of recomputation for TrueType fonts, which is slow. |
| * Another reason is caching: Selecting a different mode usually causes |
| * changes in both the outlines and the rasterized bitmaps; it is thus |
| * necessary to empty the cache after a mode switch to avoid false hits. |
| * |
| */ |
| #define FT_LOAD_TARGET_( x ) ( (FT_Int32)( (x) & 15 ) << 16 ) |
| |
| #define FT_LOAD_TARGET_NORMAL FT_LOAD_TARGET_( FT_RENDER_MODE_NORMAL ) |
| #define FT_LOAD_TARGET_LIGHT FT_LOAD_TARGET_( FT_RENDER_MODE_LIGHT ) |
| #define FT_LOAD_TARGET_MONO FT_LOAD_TARGET_( FT_RENDER_MODE_MONO ) |
| #define FT_LOAD_TARGET_LCD FT_LOAD_TARGET_( FT_RENDER_MODE_LCD ) |
| #define FT_LOAD_TARGET_LCD_V FT_LOAD_TARGET_( FT_RENDER_MODE_LCD_V ) |
| |
| |
| /************************************************************************** |
| * |
| * @macro: |
| * FT_LOAD_TARGET_MODE |
| * |
| * @description: |
| * Return the @FT_Render_Mode corresponding to a given |
| * @FT_LOAD_TARGET_XXX value. |
| * |
| */ |
| #define FT_LOAD_TARGET_MODE( x ) ( (FT_Render_Mode)( ( (x) >> 16 ) & 15 ) ) |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Set_Transform |
| * |
| * @description: |
| * Set the transformation that is applied to glyph images when they |
| * are loaded into a glyph slot through @FT_Load_Glyph. |
| * |
| * @inout: |
| * face :: |
| * A handle to the source face object. |
| * |
| * @input: |
| * matrix :: |
| * A pointer to the transformation's 2x2 matrix. Use NULL |
| * for the identity matrix. |
| * delta :: |
| * A pointer to the translation vector. Use NULL 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_Size or @FT_Set_Pixel_Sizes. |
| * |
| * Note that this also transforms the `face.glyph.advance' field, but |
| * *not* the values in `face.glyph.metrics'. |
| */ |
| FT_EXPORT( void ) |
| FT_Set_Transform( FT_Face face, |
| FT_Matrix* matrix, |
| FT_Vector* delta ); |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_Render_Mode |
| * |
| * @description: |
| * Render modes supported by FreeType~2. Each mode corresponds to a |
| * specific type of scanline conversion performed on the outline. |
| * |
| * For bitmap fonts and embedded bitmaps the `bitmap->pixel_mode' |
| * field in the @FT_GlyphSlotRec structure gives the format of the |
| * returned bitmap. |
| * |
| * All modes except @FT_RENDER_MODE_MONO use 256 levels of opacity, |
| * indicating pixel coverage. Use linear alpha blending and gamma |
| * correction to correctly render non-monochrome glyph bitmaps onto a |
| * surface; see @FT_Render_Glyph. |
| * |
| * @values: |
| * FT_RENDER_MODE_NORMAL :: |
| * Default render mode; it corresponds to 8-bit anti-aliased |
| * bitmaps. |
| * |
| * FT_RENDER_MODE_LIGHT :: |
| * This is equivalent to @FT_RENDER_MODE_NORMAL. It is only |
| * defined as a separate value because render modes are also used |
| * indirectly to define hinting algorithm selectors. See |
| * @FT_LOAD_TARGET_XXX for details. |
| * |
| * FT_RENDER_MODE_MONO :: |
| * This mode corresponds to 1-bit bitmaps (with 2~levels of |
| * opacity). |
| * |
| * FT_RENDER_MODE_LCD :: |
| * This mode corresponds to horizontal RGB and BGR subpixel |
| * displays like LCD screens. It produces 8-bit bitmaps that are |
| * 3~times the width of the original glyph outline in pixels, and |
| * which use the @FT_PIXEL_MODE_LCD mode. |
| * |
| * FT_RENDER_MODE_LCD_V :: |
| * This mode corresponds to vertical RGB and BGR subpixel displays |
| * (like PDA screens, rotated LCD displays, etc.). It produces |
| * 8-bit bitmaps that are 3~times the height of the original |
| * glyph outline in pixels and use the @FT_PIXEL_MODE_LCD_V mode. |
| * |
| * @note: |
| * Should you define FT_CONFIG_OPTION_SUBPIXEL_RENDERING in your |
| * `ftoption.h', which enables patented ClearType-style rendering, |
| * the LCD-optimized glyph bitmaps should be filtered to reduce color |
| * fringes inherent to this technology. You can either set up LCD |
| * filtering with @FT_Library_SetLcdFilter or @FT_Face_Properties, |
| * or do the filtering yourself. The default FreeType LCD rendering |
| * technology does not require filtering. |
| * |
| * The selected render mode only affects vector glyphs of a font. |
| * Embedded bitmaps often have a different pixel mode like |
| * @FT_PIXEL_MODE_MONO. You can use @FT_Bitmap_Convert to transform |
| * them into 8-bit pixmaps. |
| */ |
| typedef enum FT_Render_Mode_ |
| { |
| FT_RENDER_MODE_NORMAL = 0, |
| FT_RENDER_MODE_LIGHT, |
| FT_RENDER_MODE_MONO, |
| FT_RENDER_MODE_LCD, |
| FT_RENDER_MODE_LCD_V, |
| |
| FT_RENDER_MODE_MAX |
| |
| } FT_Render_Mode; |
| |
| |
| /* these constants are deprecated; use the corresponding */ |
| /* `FT_Render_Mode' values instead */ |
| #define ft_render_mode_normal FT_RENDER_MODE_NORMAL |
| #define ft_render_mode_mono FT_RENDER_MODE_MONO |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Render_Glyph |
| * |
| * @description: |
| * Convert a given glyph image to a bitmap. It does so by inspecting |
| * the glyph image format, finding the relevant renderer, and |
| * invoking it. |
| * |
| * @inout: |
| * slot :: |
| * A handle to the glyph slot containing the image to |
| * convert. |
| * |
| * @input: |
| * render_mode :: |
| * The render mode used to render the glyph image into |
| * a bitmap. See @FT_Render_Mode for a list of |
| * possible values. |
| * |
| * If @FT_RENDER_MODE_NORMAL is used, the flag |
| * @FT_LOAD_COLOR can be additionally set to make the |
| * function provide a default blending of colored |
| * glyph layers associated with the current glyph slot |
| * (provided the font contains such layers) instead of |
| * rendering the glyph slot's outline. See |
| * @FT_LOAD_COLOR for more information. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * To get meaningful results, font scaling values must be set with |
| * functions like @FT_Set_Char_Size before calling `FT_Render_Glyph'. |
| * |
| * When FreeType outputs a bitmap of a glyph, it really outputs an |
| * alpha coverage map. If a pixel is completely covered by a |
| * filled-in outline, the bitmap contains 0xFF at that pixel, meaning |
| * that 0xFF/0xFF fraction of that pixel is covered, meaning the |
| * pixel is 100% black (or 0% bright). If a pixel is only 50% |
| * covered (value 0x80), the pixel is made 50% black (50% bright or a |
| * middle shade of grey). 0% covered means 0% black (100% bright or |
| * white). |
| * |
| * On high-DPI screens like on smartphones and tablets, the pixels |
| * are so small that their chance of being completely covered and |
| * therefore completely black are fairly good. On the low-DPI |
| * screens, however, the situation is different. The pixels are too |
| * large for most of the details of a glyph and shades of gray are |
| * the norm rather than the exception. |
| * |
| * This is relevant because all our screens have a second problem: |
| * they are not linear. 1~+~1 is not~2. Twice the value does not |
| * result in twice the brightness. When a pixel is only 50% covered, |
| * the coverage map says 50% black, and this translates to a pixel |
| * value of 128 when you use 8~bits per channel (0-255). However, |
| * this does not translate to 50% brightness for that pixel on our |
| * sRGB and gamma~2.2 screens. Due to their non-linearity, they |
| * dwell longer in the darks and only a pixel value of about 186 |
| * results in 50% brightness -- 128 ends up too dark on both bright |
| * and dark backgrounds. The net result is that dark text looks |
| * burnt-out, pixely and blotchy on bright background, bright text |
| * too frail on dark backgrounds, and colored text on colored |
| * background (for example, red on green) seems to have dark halos or |
| * `dirt' around it. The situation is especially ugly for diagonal |
| * stems like in `w' glyph shapes where the quality of FreeType's |
| * anti-aliasing depends on the correct display of grays. On |
| * high-DPI screens where smaller, fully black pixels reign supreme, |
| * this doesn't matter, but on our low-DPI screens with all the gray |
| * shades, it does. 0% and 100% brightness are the same things in |
| * linear and non-linear space, just all the shades in-between |
| * aren't. |
| * |
| * The blending function for placing text over a background is |
| * |
| * { |
| * dst = alpha * src + (1 - alpha) * dst , |
| * } |
| * |
| * which is known as the OVER operator. |
| * |
| * To correctly composite an antialiased pixel of a glyph onto a |
| * surface, |
| * |
| * 1. take the foreground and background colors (e.g., in sRGB space) |
| * and apply gamma to get them in a linear space, |
| * |
| * 2. use OVER to blend the two linear colors using the glyph pixel |
| * as the alpha value (remember, the glyph bitmap is an alpha |
| * coverage bitmap), and |
| * |
| * 3. apply inverse gamma to the blended pixel and write it back to |
| * the image. |
| * |
| * Internal testing at Adobe found that a target inverse gamma of~1.8 |
| * for step~3 gives good results across a wide range of displays with |
| * an sRGB gamma curve or a similar one. |
| * |
| * This process can cost performance. There is an approximation that |
| * does not need to know about the background color; see |
| * https://bel.fi/alankila/lcd/ and |
| * https://bel.fi/alankila/lcd/alpcor.html for details. |
| * |
| * *ATTENTION*: Linear blending is even more important when dealing |
| * with subpixel-rendered glyphs to prevent color-fringing! A |
| * subpixel-rendered glyph must first be filtered with a filter that |
| * gives equal weight to the three color primaries and does not |
| * exceed a sum of 0x100, see section @lcd_rendering. Then the |
| * only difference to gray linear blending is that subpixel-rendered |
| * linear blending is done 3~times per pixel: red foreground subpixel |
| * to red background subpixel and so on for green and blue. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Render_Glyph( FT_GlyphSlot slot, |
| FT_Render_Mode render_mode ); |
| |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_Kerning_Mode |
| * |
| * @description: |
| * An enumeration to specify the format of kerning values returned by |
| * @FT_Get_Kerning. |
| * |
| * @values: |
| * FT_KERNING_DEFAULT :: |
| * Return grid-fitted kerning distances in |
| * 26.6 fractional pixels. |
| * |
| * FT_KERNING_UNFITTED :: |
| * Return un-grid-fitted kerning distances in |
| * 26.6 fractional pixels. |
| * |
| * FT_KERNING_UNSCALED :: |
| * Return the kerning vector in original font |
| * units. |
| * |
| * @note: |
| * FT_KERNING_DEFAULT returns full pixel values; it also makes |
| * FreeType heuristically scale down kerning distances at small ppem |
| * values so that they don't become too big. |
| * |
| * Both FT_KERNING_DEFAULT and FT_KERNING_UNFITTED use the current |
| * horizontal scaling factor (as set e.g. with @FT_Set_Char_Size) to |
| * convert font units to pixels. |
| */ |
| typedef enum FT_Kerning_Mode_ |
| { |
| FT_KERNING_DEFAULT = 0, |
| FT_KERNING_UNFITTED, |
| FT_KERNING_UNSCALED |
| |
| } FT_Kerning_Mode; |
| |
| |
| /* these constants are deprecated; use the corresponding */ |
| /* `FT_Kerning_Mode' values instead */ |
| #define ft_kerning_default FT_KERNING_DEFAULT |
| #define ft_kerning_unfitted FT_KERNING_UNFITTED |
| #define ft_kerning_unscaled FT_KERNING_UNSCALED |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_Kerning |
| * |
| * @description: |
| * Return the kerning vector between two glyphs of the 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 and dimension of the returned |
| * kerning vector. |
| * |
| * @output: |
| * akerning :: |
| * The kerning vector. This is either in font units, |
| * fractional pixels (26.6 format), or pixels 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. |
| * |
| * Kerning for OpenType fonts implemented in a `GPOS' table is not |
| * supported; use @FT_HAS_KERNING to find out whether a font has data |
| * that can be extracted with `FT_Get_Kerning'. |
| */ |
| 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_Track_Kerning |
| * |
| * @description: |
| * Return the track kerning for a given face object at a given size. |
| * |
| * @input: |
| * face :: |
| * A handle to a source face object. |
| * |
| * point_size :: |
| * The point size in 16.16 fractional points. |
| * |
| * degree :: |
| * The degree of tightness. Increasingly negative |
| * values represent tighter track kerning, while |
| * increasingly positive values represent looser track |
| * kerning. Value zero means no track kerning. |
| * |
| * @output: |
| * akerning :: |
| * The kerning in 16.16 fractional points, to be |
| * uniformly applied between all glyphs. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * Currently, only the Type~1 font driver supports track kerning, |
| * using data from AFM files (if attached with @FT_Attach_File or |
| * @FT_Attach_Stream). |
| * |
| * Only very few AFM files come with track kerning data; please refer |
| * to Adobe's AFM specification for more details. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Get_Track_Kerning( FT_Face face, |
| FT_Fixed point_size, |
| FT_Int degree, |
| FT_Fixed* akerning ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_Glyph_Name |
| * |
| * @description: |
| * Retrieve the ASCII name of a given glyph in a face. This only |
| * works for those faces where @FT_HAS_GLYPH_NAMES(face) returns~1. |
| * |
| * @input: |
| * face :: |
| * A handle to a source face object. |
| * |
| * glyph_index :: |
| * The glyph index. |
| * |
| * buffer_max :: |
| * The maximum number of bytes available in the |
| * buffer. |
| * |
| * @output: |
| * buffer :: |
| * A pointer to a target buffer where the name is |
| * 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' is 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. |
| * |
| * Be aware that FreeType reorders glyph indices internally so that |
| * glyph index~0 always corresponds to the `missing glyph' (called |
| * `.notdef'). |
| * |
| * This function always returns an error if the config macro |
| * `FT_CONFIG_OPTION_NO_GLYPH_NAMES' is not defined in `ftoption.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: |
| * Retrieve the ASCII PostScript name of a given face, if available. |
| * This only works with PostScript, TrueType, and OpenType fonts. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * @return: |
| * A pointer to the face's PostScript name. NULL if unavailable. |
| * |
| * @note: |
| * The returned pointer is owned by the face and is destroyed with |
| * it. |
| * |
| * For variation fonts, this string changes if you select a different |
| * instance, and you have to call `FT_Get_PostScript_Name' again to |
| * retrieve it. FreeType follows Adobe TechNote #5902, `Generating |
| * PostScript Names for Fonts Using OpenType Font Variations'. |
| * |
| * https://download.macromedia.com/pub/developer/opentype/tech-notes/5902.AdobePSNameGeneration.html |
| * |
| * [Since 2.9] Special PostScript names for named instances are only |
| * returned if the named instance is set with @FT_Set_Named_Instance |
| * (and the font has corresponding entries in its `fvar' table). If |
| * @FT_IS_VARIATION returns true, the algorithmically derived |
| * PostScript name is provided, not looking up special entries for |
| * named instances. |
| */ |
| FT_EXPORT( const char* ) |
| FT_Get_Postscript_Name( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Select_Charmap |
| * |
| * @description: |
| * Select 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 encoding. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * This function returns an error if no charmap in the face |
| * corresponds to the encoding queried here. |
| * |
| * Because many fonts contain more than a single cmap for Unicode |
| * encoding, this function has some special code to select the one |
| * that covers Unicode best (`best' in the sense that a UCS-4 cmap is |
| * preferred to a UCS-2 cmap). It is thus preferable to |
| * @FT_Set_Charmap in this case. |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Select_Charmap( FT_Face face, |
| FT_Encoding encoding ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Set_Charmap |
| * |
| * @description: |
| * Select a given charmap for character code to glyph index mapping. |
| * |
| * @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 returns an error if the charmap is not part of |
| * the face (i.e., if it is not listed in the `face->charmaps' |
| * table). |
| * |
| * It also fails if an OpenType type~14 charmap is selected (which |
| * doesn't map character codes to glyph indices at all). |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Set_Charmap( FT_Face face, |
| FT_CharMap charmap ); |
| |
| |
| /************************************************************************* |
| * |
| * @function: |
| * FT_Get_Charmap_Index |
| * |
| * @description: |
| * Retrieve index of a given charmap. |
| * |
| * @input: |
| * charmap :: |
| * A handle to a charmap. |
| * |
| * @return: |
| * The index into the array of character maps within the face to which |
| * `charmap' belongs. If an error occurs, -1 is returned. |
| * |
| */ |
| FT_EXPORT( FT_Int ) |
| FT_Get_Charmap_Index( FT_CharMap charmap ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_Char_Index |
| * |
| * @description: |
| * Return the glyph index of a given character code. This function |
| * uses the currently selected charmap to do the mapping. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * charcode :: |
| * The character code. |
| * |
| * @return: |
| * The glyph index. 0~means `undefined character code'. |
| * |
| * @note: |
| * If you use FreeType to manipulate the contents of font files |
| * directly, be aware that the glyph index returned by this function |
| * doesn't always correspond to the internal indices used within the |
| * file. This is done to ensure that value~0 always corresponds to |
| * the `missing glyph'. If the first glyph is not named `.notdef', |
| * then for Type~1 and Type~42 fonts, `.notdef' will be moved into |
| * the glyph ID~0 position, and whatever was there will be moved to |
| * the position `.notdef' had. For Type~1 fonts, if there is no |
| * `.notdef' glyph at all, then one will be created at index~0 and |
| * whatever was there will be moved to the last index -- Type~42 |
| * fonts are considered invalid under this condition. |
| */ |
| FT_EXPORT( FT_UInt ) |
| FT_Get_Char_Index( FT_Face face, |
| FT_ULong charcode ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_First_Char |
| * |
| * @description: |
| * Return the first character code in the current charmap of a given |
| * face, together with its corresponding glyph index. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * @output: |
| * agindex :: |
| * Glyph index of first character code. 0~if charmap is |
| * empty. |
| * |
| * @return: |
| * The charmap's first character code. |
| * |
| * @note: |
| * You should use this function together with @FT_Get_Next_Char to |
| * parse all character codes available in a given charmap. The code |
| * should look like this: |
| * |
| * { |
| * FT_ULong charcode; |
| * FT_UInt gindex; |
| * |
| * |
| * charcode = FT_Get_First_Char( face, &gindex ); |
| * while ( gindex != 0 ) |
| * { |
| * ... do something with (charcode,gindex) pair ... |
| * |
| * charcode = FT_Get_Next_Char( face, charcode, &gindex ); |
| * } |
| * } |
| * |
| * Be aware that character codes can have values up to 0xFFFFFFFF; |
| * this might happen for non-Unicode or malformed cmaps. However, |
| * even with regular Unicode encoding, so-called `last resort fonts' |
| * (using SFNT cmap format 13, see function @FT_Get_CMap_Format) |
| * normally have entries for all Unicode characters up to 0x1FFFFF, |
| * which can cause *a lot* of iterations. |
| * |
| * Note that `*agindex' is set to~0 if the charmap is empty. The |
| * result itself can be~0 in two cases: if the charmap is empty or |
| * if the value~0 is the first valid character code. |
| */ |
| FT_EXPORT( FT_ULong ) |
| FT_Get_First_Char( FT_Face face, |
| FT_UInt *agindex ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_Next_Char |
| * |
| * @description: |
| * Return the next character code in the current charmap of a given |
| * face following the value `char_code', as well as the corresponding |
| * glyph index. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * char_code :: |
| * The starting character code. |
| * |
| * @output: |
| * agindex :: |
| * Glyph index of next character code. 0~if charmap |
| * is empty. |
| * |
| * @return: |
| * The charmap's next character code. |
| * |
| * @note: |
| * You should use this function with @FT_Get_First_Char to walk |
| * over all character codes available in a given charmap. See the |
| * note for that function for a simple code example. |
| * |
| * Note that `*agindex' is set to~0 when there are no more codes in |
| * the charmap. |
| */ |
| FT_EXPORT( FT_ULong ) |
| FT_Get_Next_Char( FT_Face face, |
| FT_ULong char_code, |
| FT_UInt *agindex ); |
| |
| |
| /************************************************************************* |
| * |
| * @function: |
| * FT_Face_Properties |
| * |
| * @description: |
| * Set or override certain (library or module-wide) properties on a |
| * face-by-face basis. Useful for finer-grained control and avoiding |
| * locks on shared structures (threads can modify their own faces as |
| * they see fit). |
| * |
| * Contrary to @FT_Property_Set, this function uses @FT_Parameter so |
| * that you can pass multiple properties to the target face in one call. |
| * Note that only a subset of the available properties can be |
| * controlled. |
| * |
| * * @FT_PARAM_TAG_STEM_DARKENING (stem darkening, corresponding to the |
| * property `no-stem-darkening' provided by the `autofit', `cff', |
| * `type1', and `t1cid' modules; see @no-stem-darkening). |
| * |
| * * @FT_PARAM_TAG_LCD_FILTER_WEIGHTS (LCD filter weights, corresponding |
| * to function @FT_Library_SetLcdFilterWeights). |
| * |
| * * @FT_PARAM_TAG_RANDOM_SEED (seed value for the CFF, Type~1, and CID |
| * `random' operator, corresponding to the `random-seed' property |
| * provided by the `cff', `type1', and `t1cid' modules; see |
| * @random-seed). |
| * |
| * Pass NULL as `data' in @FT_Parameter for a given tag to reset the |
| * option and use the library or module default again. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * num_properties :: |
| * The number of properties that follow. |
| * |
| * properties :: |
| * A handle to an @FT_Parameter array with `num_properties' elements. |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @example: |
| * Here an example that sets three properties. You must define |
| * FT_CONFIG_OPTION_SUBPIXEL_RENDERING to make the LCD filter examples |
| * work. |
| * |
| * { |
| * FT_Parameter property1; |
| * FT_Bool darken_stems = 1; |
| * |
| * FT_Parameter property2; |
| * FT_LcdFiveTapFilter custom_weight = |
| * { 0x11, 0x44, 0x56, 0x44, 0x11 }; |
| * |
| * FT_Parameter property3; |
| * FT_Int32 random_seed = 314159265; |
| * |
| * FT_Parameter properties[3] = { property1, |
| * property2, |
| * property3 }; |
| * |
| * |
| * property1.tag = FT_PARAM_TAG_STEM_DARKENING; |
| * property1.data = &darken_stems; |
| * |
| * property2.tag = FT_PARAM_TAG_LCD_FILTER_WEIGHTS; |
| * property2.data = custom_weight; |
| * |
| * property3.tag = FT_PARAM_TAG_RANDOM_SEED; |
| * property3.data = &random_seed; |
| * |
| * FT_Face_Properties( face, 3, properties ); |
| * } |
| * |
| * The next example resets a single property to its default value. |
| * |
| * { |
| * FT_Parameter property; |
| * |
| * |
| * property.tag = FT_PARAM_TAG_LCD_FILTER_WEIGHTS; |
| * property.data = NULL; |
| * |
| * FT_Face_Properties( face, 1, &property ); |
| * } |
| * |
| * @since: |
| * 2.8 |
| * |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Face_Properties( FT_Face face, |
| FT_UInt num_properties, |
| FT_Parameter* properties ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_Name_Index |
| * |
| * @description: |
| * Return the glyph index of a given glyph name. |
| * |
| * @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 ); |
| |
| |
| /************************************************************************* |
| * |
| * @enum: |
| * FT_SUBGLYPH_FLAG_XXX |
| * |
| * @description: |
| * A list of constants describing subglyphs. Please refer to the |
| * `glyf' table description in the OpenType specification for the |
| * meaning of the various flags (which get synthesized for |
| * non-OpenType subglyphs). |
| * |
| * https://docs.microsoft.com/en-us/typography/opentype/spec/glyf#composite-glyph-description |
| * |
| * @values: |
| * FT_SUBGLYPH_FLAG_ARGS_ARE_WORDS :: |
| * FT_SUBGLYPH_FLAG_ARGS_ARE_XY_VALUES :: |
| * FT_SUBGLYPH_FLAG_ROUND_XY_TO_GRID :: |
| * FT_SUBGLYPH_FLAG_SCALE :: |
| * FT_SUBGLYPH_FLAG_XY_SCALE :: |
| * FT_SUBGLYPH_FLAG_2X2 :: |
| * FT_SUBGLYPH_FLAG_USE_MY_METRICS :: |
| * |
| */ |
| #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 |
| |
| |
| /************************************************************************* |
| * |
| * @function: |
| * FT_Get_SubGlyph_Info |
| * |
| * @description: |
| * Retrieve a description of a given subglyph. Only use it if |
| * `glyph->format' is @FT_GLYPH_FORMAT_COMPOSITE; an error is |
| * returned otherwise. |
| * |
| * @input: |
| * glyph :: |
| * The source glyph slot. |
| * |
| * sub_index :: |
| * The index of the subglyph. Must be less than |
| * `glyph->num_subglyphs'. |
| * |
| * @output: |
| * p_index :: |
| * The glyph index of the subglyph. |
| * |
| * p_flags :: |
| * The subglyph flags, see @FT_SUBGLYPH_FLAG_XXX. |
| * |
| * p_arg1 :: |
| * The subglyph's first argument (if any). |
| * |
| * p_arg2 :: |
| * The subglyph's second argument (if any). |
| * |
| * p_transform :: |
| * The subglyph transformation (if any). |
| * |
| * @return: |
| * FreeType error code. 0~means success. |
| * |
| * @note: |
| * The values of `*p_arg1', `*p_arg2', and `*p_transform' must be |
| * interpreted depending on the flags returned in `*p_flags'. See the |
| * OpenType specification for details. |
| * |
| */ |
| FT_EXPORT( FT_Error ) |
| FT_Get_SubGlyph_Info( FT_GlyphSlot glyph, |
| FT_UInt sub_index, |
| FT_Int *p_index, |
| FT_UInt *p_flags, |
| FT_Int *p_arg1, |
| FT_Int *p_arg2, |
| FT_Matrix *p_transform ); |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * layer_management |
| * |
| * @title: |
| * Glyph Layer Management |
| * |
| * @abstract: |
| * Retrieving and manipulating OpenType's `COLR' table data. |
| * |
| * @description: |
| * The functions described here allow access of colored glyph layer data |
| * in OpenType's `COLR' tables. |
| */ |
| |
| |
| /********************************************************************** |
| * |
| * @struct: |
| * FT_LayerIterator |
| * |
| * @description: |
| * This iterator object is needed for @FT_Get_Color_Glyph_Layer. |
| * |
| * @fields: |
| * num_layers :: |
| * The number of glyph layers for the requested glyph index. Will be |
| * set by @FT_Get_Color_Glyph_Layer. |
| * |
| * layer :: |
| * The current layer. Will be set by @FT_Get_Color_Glyph_Layer. |
| * |
| * p :: |
| * An opaque pointer into `COLR' table data. The caller must set this |
| * to NULL before the first call of @FT_Get_Color_Glyph_Layer. |
| */ |
| typedef struct FT_LayerIterator_ |
| { |
| FT_UInt num_layers; |
| FT_UInt layer; |
| FT_Byte* p; |
| |
| } FT_LayerIterator; |
| |
| |
| /************************************************************************* |
| * |
| * @function: |
| * FT_Get_Color_Glyph_Layer |
| * |
| * @description: |
| * This is an interface to the `COLR' table in OpenType fonts to |
| * iteratively retrieve the colored glyph layers associated with the |
| * current glyph slot. |
| * |
| * https://docs.microsoft.com/en-us/typography/opentype/spec/colr |
| * |
| * The glyph layer data for a given glyph index, if present, provides an |
| * alternative, multi-colour glyph representation: Instead of rendering |
| * the outline or bitmap with the given glyph index, glyphs with the |
| * indices and colors returned by this function are rendered layer by |
| * layer. |
| * |
| * The returned elements are ordered in the z~direction from bottom to |
| * top; the `n'th element should be rendered with the associated palette |
| * color and blended on top of the already rendered layers (elements 0, |
| * 1, ..., n-1). |
| * |
| * @input: |
| * face :: |
| * A handle to the parent face object. |
| * |
| * base_glyph :: |
| * The glyph index the colored glyph layers are associated with. |
| * |
| * @inout: |
| * iterator :: |
| * An @FT_LayerIterator object. For the first call you should set |
| * `iterator->p' to NULL. For all following calls, simply use the |
| * same object again. |
| * |
| * @output: |
| * aglyph_index :: |
| * The glyph index of the current layer. |
| * |
| * acolor_index :: |
| * The color index into the font face's color palette of the current |
| * layer. The value 0xFFFF is special; it doesn't reference a palette |
| * entry but indicates that the text foreground color should be used |
| * instead (to be set up by the application outside of FreeType). |
| * |
| * The color palette can be retrieved with @FT_Palette_Select. |
| * |
| * @return: |
| * Value~1 if everything is OK. If there are no more layers (or if |
| * there are no layers at all), value~0 gets returned. In case of an |
| * error, value~0 is returned also. |
| * |
| * @note: |
| * This function is necessary if you want to handle glyph layers by |
| * yourself. In particular, functions that operate with @FT_GlyphRec |
| * objects (like @FT_Get_Glyph or @FT_Glyph_To_Bitmap) don't have access |
| * to this information. |
| * |
| * @FT_Render_Glyph, however, handles colored glyph layers |
| * automatically if the @FT_LOAD_COLOR flag is passed to it. |
| * |
| * @example: |
| * { |
| * FT_Color* palette; |
| * FT_LayerIterator iterator; |
| * |
| * FT_Bool have_layers; |
| * FT_UInt layer_glyph_index; |
| * FT_UInt layer_color_index; |
| * |
| * |
| * error = FT_Palette_Select( face, palette_index, &palette ); |
| * if ( error ) |
| * palette = NULL; |
| * |
| * iterator.p = NULL; |
| * have_layers = FT_Get_Color_Glyph_Layer( face, |
| * glyph_index, |
| * &layer_glyph_index, |
| * &layer_color_index, |
| * &iterator ); |
| * |
| * if ( palette && have_layers ) |
| * { |
| * do |
| * { |
| * FT_Color layer_color; |
| * |
| * |
| * if ( layer_color_index == 0xFFFF ) |
| * layer_color = text_foreground_color; |
| * else |
| * layer_color = palette[layer_color_index]; |
| * |
| * // Load and render glyph `layer_glyph_index', then |
| * // blend resulting pixmap (using color `layer_color') |
| * // with previously created pixmaps. |
| * |
| * } while ( FT_Get_Color_Glyph_Layer( face, |
| * glyph_index, |
| * &layer_glyph_index, |
| * &layer_color_index, |
| * &iterator ) ); |
| * } |
| * } |
| */ |
| FT_EXPORT( FT_Bool ) |
| FT_Get_Color_Glyph_Layer( FT_Face face, |
| FT_UInt base_glyph, |
| FT_UInt *aglyph_index, |
| FT_UInt *acolor_index, |
| FT_LayerIterator* iterator ); |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * base_interface |
| * |
| */ |
| |
| /************************************************************************** |
| * |
| * @enum: |
| * FT_FSTYPE_XXX |
| * |
| * @description: |
| * A list of bit flags used in the `fsType' field of the OS/2 table |
| * in a TrueType or OpenType font and the `FSType' entry in a |
| * PostScript font. These bit flags are returned by |
| * @FT_Get_FSType_Flags; they inform client applications of embedding |
| * and subsetting restrictions associated with a font. |
| * |
| * See |
| * https://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/FontPolicies.pdf |
| * for more details. |
| * |
| * @values: |
| * FT_FSTYPE_INSTALLABLE_EMBEDDING :: |
| * Fonts with no fsType bit set may be embedded and permanently |
| * installed on the remote system by an application. |
| * |
| * FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING :: |
| * Fonts that have only this bit set must not be modified, embedded |
| * or exchanged in any manner without first obtaining permission of |
| * the font software copyright owner. |
| * |
| * FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING :: |
| * The font may be embedded and temporarily loaded on the remote |
| * system. Documents containing Preview & Print fonts must be |
| * opened `read-only'; no edits can be applied to the document. |
| * |
| * FT_FSTYPE_EDITABLE_EMBEDDING :: |
| * The font may be embedded but must only be installed temporarily |
| * on other systems. In contrast to Preview & Print fonts, |
| * documents containing editable fonts may be opened for reading, |
| * editing is permitted, and changes may be saved. |
| * |
| * FT_FSTYPE_NO_SUBSETTING :: |
| * The font may not be subsetted prior to embedding. |
| * |
| * FT_FSTYPE_BITMAP_EMBEDDING_ONLY :: |
| * Only bitmaps contained in the font may be embedded; no outline |
| * data may be embedded. If there are no bitmaps available in the |
| * font, then the font is unembeddable. |
| * |
| * @note: |
| * The flags are ORed together, thus more than a single value can be |
| * returned. |
| * |
| * While the `fsType' flags can indicate that a font may be embedded, |
| * a license with the font vendor may be separately required to use |
| * the font in this way. |
| */ |
| #define FT_FSTYPE_INSTALLABLE_EMBEDDING 0x0000 |
| #define FT_FSTYPE_RESTRICTED_LICENSE_EMBEDDING 0x0002 |
| #define FT_FSTYPE_PREVIEW_AND_PRINT_EMBEDDING 0x0004 |
| #define FT_FSTYPE_EDITABLE_EMBEDDING 0x0008 |
| #define FT_FSTYPE_NO_SUBSETTING 0x0100 |
| #define FT_FSTYPE_BITMAP_EMBEDDING_ONLY 0x0200 |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Get_FSType_Flags |
| * |
| * @description: |
| * Return the `fsType' flags for a font. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * @return: |
| * The `fsType' flags, see @FT_FSTYPE_XXX. |
| * |
| * @note: |
| * Use this function rather than directly reading the `fs_type' field |
| * in the @PS_FontInfoRec structure, which is only guaranteed to |
| * return the correct results for Type~1 fonts. |
| * |
| * @since: |
| * 2.3.8 |
| */ |
| FT_EXPORT( FT_UShort ) |
| FT_Get_FSType_Flags( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * glyph_variants |
| * |
| * @title: |
| * Unicode Variation Sequences |
| * |
| * @abstract: |
| * The FreeType~2 interface to Unicode Variation Sequences (UVS), |
| * using the SFNT cmap format~14. |
| * |
| * @description: |
| * Many characters, especially for CJK scripts, have variant forms. |
| * They are a sort of grey area somewhere between being totally |
| * irrelevant and semantically distinct; for this reason, the Unicode |
| * consortium decided to introduce Variation Sequences (VS), |
| * consisting of a Unicode base character and a variation selector |
| * instead of further extending the already huge number of |
| * characters. |
| * |
| * Unicode maintains two different sets, namely `Standardized |
| * Variation Sequences' and registered `Ideographic Variation |
| * Sequences' (IVS), collected in the `Ideographic Variation |
| * Database' (IVD). |
| * |
| * https://unicode.org/Public/UCD/latest/ucd/StandardizedVariants.txt |
| * https://unicode.org/reports/tr37/ |
| * https://unicode.org/ivd/ |
| * |
| * To date (January 2017), the character with the most ideographic |
| * variations is U+9089, having 32 such IVS. |
| * |
| * Three Mongolian Variation Selectors have the values U+180B-U+180D; |
| * 256 generic Variation Selectors are encoded in the ranges |
| * U+FE00-U+FE0F and U+E0100-U+E01EF. IVS currently use Variation |
| * Selectors from the range U+E0100-U+E01EF only. |
| * |
| * A VS consists of the base character value followed by a single |
| * Variation Selector. For example, to get the first variation of |
| * U+9089, you have to write the character sequence `U+9089 U+E0100'. |
| * |
| * Adobe and MS decided to support both standardized and ideographic |
| * VS with a new cmap subtable (format~14). It is an odd subtable |
| * because it is not a mapping of input code points to glyphs, but |
| * contains lists of all variations supported by the font. |
| * |
| * A variation may be either `default' or `non-default' for a given |
| * font. A default variation is the one you will get for that code |
| * point if you look it up in the standard Unicode cmap. A |
| * non-default variation is a different glyph. |
| * |
| */ |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_GetCharVariantIndex |
| * |
| * @description: |
| * Return the glyph index of a given character code as modified by |
| * the variation selector. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * charcode :: |
| * The character code point in Unicode. |
| * |
| * variantSelector :: |
| * The Unicode code point of the variation selector. |
| * |
| * @return: |
| * The glyph index. 0~means either `undefined character code', or |
| * `undefined selector code', or `no variation selector cmap |
| * subtable', or `current CharMap is not Unicode'. |
| * |
| * @note: |
| * If you use FreeType to manipulate the contents of font files |
| * directly, be aware that the glyph index returned by this function |
| * doesn't always correspond to the internal indices used within |
| * the file. This is done to ensure that value~0 always corresponds |
| * to the `missing glyph'. |
| * |
| * This function is only meaningful if |
| * a) the font has a variation selector cmap sub table, |
| * and |
| * b) the current charmap has a Unicode encoding. |
| * |
| * @since: |
| * 2.3.6 |
| */ |
| FT_EXPORT( FT_UInt ) |
| FT_Face_GetCharVariantIndex( FT_Face face, |
| FT_ULong charcode, |
| FT_ULong variantSelector ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_GetCharVariantIsDefault |
| * |
| * @description: |
| * Check whether this variation of this Unicode character is the one |
| * to be found in the `cmap'. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * charcode :: |
| * The character codepoint in Unicode. |
| * |
| * variantSelector :: |
| * The Unicode codepoint of the variation selector. |
| * |
| * @return: |
| * 1~if found in the standard (Unicode) cmap, 0~if found in the |
| * variation selector cmap, or -1 if it is not a variation. |
| * |
| * @note: |
| * This function is only meaningful if the font has a variation |
| * selector cmap subtable. |
| * |
| * @since: |
| * 2.3.6 |
| */ |
| FT_EXPORT( FT_Int ) |
| FT_Face_GetCharVariantIsDefault( FT_Face face, |
| FT_ULong charcode, |
| FT_ULong variantSelector ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_GetVariantSelectors |
| * |
| * @description: |
| * Return a zero-terminated list of Unicode variation selectors found |
| * in the font. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * @return: |
| * A pointer to an array of selector code points, or NULL if there is |
| * no valid variation selector cmap subtable. |
| * |
| * @note: |
| * The last item in the array is~0; the array is owned by the |
| * @FT_Face object but can be overwritten or released on the next |
| * call to a FreeType function. |
| * |
| * @since: |
| * 2.3.6 |
| */ |
| FT_EXPORT( FT_UInt32* ) |
| FT_Face_GetVariantSelectors( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_GetVariantsOfChar |
| * |
| * @description: |
| * Return a zero-terminated list of Unicode variation selectors found |
| * for the specified character code. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * charcode :: |
| * The character codepoint in Unicode. |
| * |
| * @return: |
| * A pointer to an array of variation selector code points that are |
| * active for the given character, or NULL if the corresponding list |
| * is empty. |
| * |
| * @note: |
| * The last item in the array is~0; the array is owned by the |
| * @FT_Face object but can be overwritten or released on the next |
| * call to a FreeType function. |
| * |
| * @since: |
| * 2.3.6 |
| */ |
| FT_EXPORT( FT_UInt32* ) |
| FT_Face_GetVariantsOfChar( FT_Face face, |
| FT_ULong charcode ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_GetCharsOfVariant |
| * |
| * @description: |
| * Return a zero-terminated list of Unicode character codes found for |
| * the specified variation selector. |
| * |
| * @input: |
| * face :: |
| * A handle to the source face object. |
| * |
| * variantSelector :: |
| * The variation selector code point in Unicode. |
| * |
| * @return: |
| * A list of all the code points that are specified by this selector |
| * (both default and non-default codes are returned) or NULL if there |
| * is no valid cmap or the variation selector is invalid. |
| * |
| * @note: |
| * The last item in the array is~0; the array is owned by the |
| * @FT_Face object but can be overwritten or released on the next |
| * call to a FreeType function. |
| * |
| * @since: |
| * 2.3.6 |
| */ |
| FT_EXPORT( FT_UInt32* ) |
| FT_Face_GetCharsOfVariant( FT_Face face, |
| FT_ULong variantSelector ); |
| |
| |
| /************************************************************************** |
| * |
| * @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: |
| * Compute `(a*b)/c' with maximum accuracy, using 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: |
| * Compute `(a*b)/0x10000' with maximum accuracy. Its main use is to |
| * multiply a given value by a 16.16 fixed-point 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: |
| * Compute `(a*0x10000)/b' with maximum accuracy. Its main use is to |
| * divide a given value by a 16.16 fixed-point factor. |
| * |
| * @input: |
| * a :: |
| * The numerator. |
| * |
| * b :: |
| * The denominator. Use a 16.16 factor here. |
| * |
| * @return: |
| * The result of `(a*0x10000)/b'. |
| */ |
| FT_EXPORT( FT_Long ) |
| FT_DivFix( FT_Long a, |
| FT_Long b ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_RoundFix |
| * |
| * @description: |
| * Round a 16.16 fixed number. |
| * |
| * @input: |
| * a :: |
| * The number to be rounded. |
| * |
| * @return: |
| * `a' rounded to the nearest 16.16 fixed integer, halfway cases away |
| * from zero. |
| * |
| * @note: |
| * The function uses wrap-around arithmetic. |
| */ |
| FT_EXPORT( FT_Fixed ) |
| FT_RoundFix( FT_Fixed a ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_CeilFix |
| * |
| * @description: |
| * Compute the smallest following integer of a 16.16 fixed number. |
| * |
| * @input: |
| * a :: |
| * The number for which the ceiling function is to be computed. |
| * |
| * @return: |
| * `a' rounded towards plus infinity. |
| * |
| * @note: |
| * The function uses wrap-around arithmetic. |
| */ |
| FT_EXPORT( FT_Fixed ) |
| FT_CeilFix( FT_Fixed a ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_FloorFix |
| * |
| * @description: |
| * Compute the largest previous integer of a 16.16 fixed number. |
| * |
| * @input: |
| * a :: |
| * The number for which the floor function is to be computed. |
| * |
| * @return: |
| * `a' rounded towards minus infinity. |
| */ |
| FT_EXPORT( FT_Fixed ) |
| FT_FloorFix( FT_Fixed a ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Vector_Transform |
| * |
| * @description: |
| * Transform 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, |
| const FT_Matrix* matrix ); |
| |
| |
| /************************************************************************** |
| * |
| * @section: |
| * version |
| * |
| * @title: |
| * FreeType Version |
| * |
| * @abstract: |
| * Functions and macros related to FreeType versions. |
| * |
| * @description: |
| * Note that those functions and macros are of limited use because |
| * even a new release of FreeType with only documentation changes |
| * increases the version number. |
| * |
| * @order: |
| * FT_Library_Version |
| * |
| * FREETYPE_MAJOR |
| * FREETYPE_MINOR |
| * FREETYPE_PATCH |
| * |
| * FT_Face_CheckTrueTypePatents |
| * FT_Face_SetUnpatentedHinting |
| * |
| */ |
| |
| |
| /************************************************************************* |
| * |
| * @enum: |
| * FREETYPE_XXX |
| * |
| * @description: |
| * These three macros identify the FreeType source code version. |
| * Use @FT_Library_Version to access them at runtime. |
| * |
| * @values: |
| * FREETYPE_MAJOR :: |
| * The major version number. |
| * FREETYPE_MINOR :: |
| * The minor version number. |
| * FREETYPE_PATCH :: |
| * The patch level. |
| * |
| * @note: |
| * The version number of FreeType if built as a dynamic link library |
| * with the `libtool' package is _not_ controlled by these three |
| * macros. |
| * |
| */ |
| #define FREETYPE_MAJOR 2 |
| #define FREETYPE_MINOR 9 |
| #define FREETYPE_PATCH 1 |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Library_Version |
| * |
| * @description: |
| * Return the version of the FreeType library being used. This is |
| * useful when dynamically linking to the library, since one cannot |
| * use the macros @FREETYPE_MAJOR, @FREETYPE_MINOR, and |
| * @FREETYPE_PATCH. |
| * |
| * @input: |
| * library :: |
| * A source library handle. |
| * |
| * @output: |
| * amajor :: |
| * The major version number. |
| * |
| * aminor :: |
| * The minor version number. |
| * |
| * apatch :: |
| * The patch version number. |
| * |
| * @note: |
| * The reason why this function takes a `library' argument is because |
| * certain programs implement library initialization in a custom way |
| * that doesn't use @FT_Init_FreeType. |
| * |
| * In such cases, the library version might not be available before |
| * the library object has been created. |
| */ |
| FT_EXPORT( void ) |
| FT_Library_Version( FT_Library library, |
| FT_Int *amajor, |
| FT_Int *aminor, |
| FT_Int *apatch ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_CheckTrueTypePatents |
| * |
| * @description: |
| * Deprecated, does nothing. |
| * |
| * @input: |
| * face :: |
| * A face handle. |
| * |
| * @return: |
| * Always returns false. |
| * |
| * @note: |
| * Since May 2010, TrueType hinting is no longer patented. |
| * |
| * @since: |
| * 2.3.5 |
| */ |
| FT_EXPORT( FT_Bool ) |
| FT_Face_CheckTrueTypePatents( FT_Face face ); |
| |
| |
| /************************************************************************** |
| * |
| * @function: |
| * FT_Face_SetUnpatentedHinting |
| * |
| * @description: |
| * Deprecated, does nothing. |
| * |
| * @input: |
| * face :: |
| * A face handle. |
| * |
| * value :: |
| * New boolean setting. |
| * |
| * @return: |
| * Always returns false. |
| * |
| * @note: |
| * Since May 2010, TrueType hinting is no longer patented. |
| * |
| * @since: |
| * 2.3.5 |
| */ |
| FT_EXPORT( FT_Bool ) |
| FT_Face_SetUnpatentedHinting( FT_Face face, |
| FT_Bool value ); |
| |
| /* */ |
| |
| |
| FT_END_HEADER |
| |
| #endif /* FREETYPE_H_ */ |
| |
| |
| /* END */ |