2232 lines
143 KiB
C
2232 lines
143 KiB
C
/***************************************************************************/
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/* */
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/* freetype.h */
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/* */
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/* FreeType high-level API and common types (specification only). */
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/* */
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/* Copyright 1996-2000 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#ifndef FREETYPE_H
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#define FREETYPE_H
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/*************************************************************************/
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/* */
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/* The `raster' component duplicates some of the declarations in */
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/* freetype.h for stand-alone use if _FREETYPE_ isn't defined. */
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/* */
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#define _FREETYPE_
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/*************************************************************************/
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/* */
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/* The FREETYPE_MAJOR and FREETYPE_MINOR macros are used to version the */
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/* new FreeType design, which is able to host several kinds of font */
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/* drivers. It starts at 2.0. */
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/* */
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#define FREETYPE_MAJOR 2
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#define FREETYPE_MINOR 0
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#include <freetype/config/ftconfig.h> /* read configuration information */
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#include <freetype/fterrors.h>
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#include <freetype/fttypes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* B A S I C T Y P E S */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Glyph_Metrics */
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/* */
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/* <Description> */
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/* A structure used to model the metrics of a single glyph. Note */
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/* that values are expressed in 26.6 fractional pixel format or in */
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/* font units, depending on context. */
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/* */
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/* <Fields> */
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/* width :: The glyph's width. */
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/* */
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/* height :: The glyph's height. */
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/* */
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/* horiBearingX :: Horizontal left side bearing. */
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/* */
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/* horiBearingY :: Horizontal top side bearing. */
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/* */
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/* horiAdvance :: Horizontal advance width. */
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/* */
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/* vertBearingX :: Vertical left side bearing. */
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/* */
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/* vertBearingY :: Vertical top side bearing. */
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/* */
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/* vertAdvance :: Vertical advance height. */
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/* */
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typedef struct FT_Glyph_Metrics_
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{
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FT_Pos width; /* glyph width */
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FT_Pos height; /* glyph height */
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FT_Pos horiBearingX; /* left side bearing in horizontal layouts */
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FT_Pos horiBearingY; /* top side bearing in horizontal layouts */
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FT_Pos horiAdvance; /* advance width for horizontal layout */
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FT_Pos vertBearingX; /* left side bearing in vertical layouts */
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FT_Pos vertBearingY; /* top side bearing in vertical layouts */
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FT_Pos vertAdvance; /* advance height for vertical layout */
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} FT_Glyph_Metrics;
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/*************************************************************************/
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/* */
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/* <FuncType> */
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/* FT_Generic_Finalizer */
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/* */
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/* <Description> */
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/* Describes a function used to destroy the `client' data of any */
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/* FreeType object. See the description of the FT_Generic type for */
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/* details of usage. */
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/* */
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/* <Input> */
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/* The address of the FreeType object which is under finalization. */
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/* Its client data is accessed through its `generic' field. */
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/* */
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typedef void (*FT_Generic_Finalizer)(void* object);
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Generic */
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/* */
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/* <Description> */
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/* Client applications often need to associate their own data to a */
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/* variety of FreeType core objects. For example, a text layout API */
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/* might want to associate a glyph cache to a given size object. */
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/* */
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/* Most FreeType object contains a `generic' field, of type */
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/* FT_Generic, which usage is left to client applications and font */
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/* servers. */
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/* */
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/* It can be used to store a pointer to client-specific data, as well */
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/* as the address of a `finalizer' function, which will be called by */
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/* FreeType when the object is destroyed (for example, the previous */
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/* client example would put the address of the glyph cache destructor */
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/* in the `finalizer' field). */
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/* */
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/* <Fields> */
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/* data :: A typeless pointer to any client-specified data. This */
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/* field is completely ignored by the FreeType library. */
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/* */
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/* finalizer :: A pointer to a `generic finalizer' function, which */
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/* will be called when the object is destroyed. If this */
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/* field is set to NULL, no code will be called. */
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/* */
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typedef struct FT_Generic_
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{
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void* data;
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FT_Generic_Finalizer finalizer;
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} FT_Generic;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_Bitmap_Size */
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/* */
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/* <Description> */
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/* An extremely simple structure used to model the size of a bitmap */
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/* strike (i.e., a bitmap instance of the font for a given */
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/* resolution) in a fixed-size font face. This is used for the */
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/* `available_sizes' field of the FT_Face_Properties structure. */
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/* */
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/* <Fields> */
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/* height :: The character height in pixels. */
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/* */
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/* width :: The character width in pixels. */
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/* */
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typedef struct FT_Bitmap_Size_
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{
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FT_Short height;
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FT_Short width;
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} FT_Bitmap_Size;
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* O B J E C T C L A S S E S */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Library */
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/* */
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/* <Description> */
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/* A handle to a FreeType library instance. Each `library' is */
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/* completely independent from the others; it is the `root' of a set */
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/* of objects like fonts, faces, sizes, etc. */
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/* */
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/* It also embeds a system object (see FT_System), as well as a */
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/* scan-line converter object (see FT_Raster). */
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/* */
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/* <Note> */
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/* Library objects are created through FT_Init_FreeType(). */
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/* */
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typedef struct FT_LibraryRec_ *FT_Library;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Module */
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/* */
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/* <Description> */
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/* A handle to a given FreeType module object. Each module can be a */
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/* font driver, a renderer, or anything else that provides services */
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/* to the formers. */
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/* */
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typedef struct FT_ModuleRec_* FT_Module;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Driver */
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/* */
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/* <Description> */
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/* A handle to a given FreeType font driver object. Each font driver */
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/* is able to create faces, sizes, glyph slots, and charmaps from the */
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/* resources whose format it supports. */
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/* */
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/* A driver can support either bitmap, graymap, or scalable font */
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/* formats. */
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/* */
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typedef struct FT_DriverRec_* FT_Driver;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Renderer */
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/* */
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/* <Description> */
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/* A handle to a given FreeType renderer. A renderer is in charge of */
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/* converting a glyph image to a bitmap, when necessary. Each */
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/* supports a given glyph image format, and one or more target */
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/* surface depths. */
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/* */
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typedef struct FT_RendererRec_* FT_Renderer;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Face */
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/* */
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/* <Description> */
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/* A handle to a given driver face object. A face object contains */
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/* all the instance and glyph independent data of a font file */
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/* typeface. */
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/* */
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/* A face object is created from a resource object through the */
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/* new_face() method of a given driver. */
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/* */
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typedef struct FT_FaceRec_* FT_Face;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_Size */
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/* */
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/* <Description> */
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/* A handle to a given driver size object. Such an object models the */
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/* _resolution_ AND _size_ dependent state of a given driver face */
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/* size. */
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/* */
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/* A size object is always created from a given face object. It is */
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/* discarded automatically by its parent face. */
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/* */
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typedef struct FT_SizeRec_* FT_Size;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_GlyphSlot */
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/* */
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/* <Description> */
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/* A handle to a given `glyph slot'. A slot is a container where it */
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/* is possible to load any of the glyphs contained within its parent */
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/* face. */
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/* */
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/* A glyph slot is created from a given face object. It is discarded */
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/* automatically by its parent face. */
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/* */
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typedef struct FT_GlyphSlotRec_* FT_GlyphSlot;
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/*************************************************************************/
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/* */
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/* <Type> */
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/* FT_CharMap */
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/* */
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/* <Description> */
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/* A handle to a given character map. A charmap is used to translate */
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/* character codes in a given encoding into glyph indexes for its */
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/* parent's face. Some font formats may provide several charmaps per */
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/* font. */
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/* */
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/* A charmap is created from a given face object. It is discarded */
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/* automatically by its parent face. */
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/* */
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typedef struct FT_CharMapRec_* FT_CharMap;
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/*************************************************************************/
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/* */
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/* <Enum> */
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/* FT_Encoding */
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/* */
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/* <Description> */
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/* An enumeration used to specify encodings supported by charmaps. */
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/* Used in the FT_Select_CharMap() API function. */
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/* */
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/* <Note> */
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/* Because of 32-bit charcodes defined in Unicode (i.e., surrogates), */
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/* all character codes must be expressed as FT_Longs. */
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/* */
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typedef enum FT_Encoding_
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{
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ft_encoding_none = 0,
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ft_encoding_symbol = FT_MAKE_TAG( 's', 'y', 'm', 'b' ),
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ft_encoding_unicode = FT_MAKE_TAG( 'u', 'n', 'i', 'c' ),
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ft_encoding_latin_2 = FT_MAKE_TAG( 'l', 'a', 't', '2' ),
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ft_encoding_sjis = FT_MAKE_TAG( 's', 'j', 'i', 's' ),
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ft_encoding_gb2312 = FT_MAKE_TAG( 'g', 'b', ' ', ' ' ),
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ft_encoding_big5 = FT_MAKE_TAG( 'b', 'i', 'g', '5' ),
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ft_encoding_wansung = FT_MAKE_TAG( 'w', 'a', 'n', 's' ),
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ft_encoding_johab = FT_MAKE_TAG( 'j', 'o', 'h', 'a' ),
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ft_encoding_adobe_standard = FT_MAKE_TAG( 'A', 'D', 'O', 'B' ),
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ft_encoding_adobe_expert = FT_MAKE_TAG( 'A', 'D', 'B', 'E' ),
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ft_encoding_adobe_custom = FT_MAKE_TAG( 'A', 'D', 'B', 'C' ),
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ft_encoding_apple_roman = FT_MAKE_TAG( 'a', 'r', 'm', 'n' )
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/* other encodings might be defined in the future */
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} FT_Encoding;
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/*************************************************************************/
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/* */
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/* <Struct> */
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/* FT_CharMapRec */
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/* */
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/* <Description> */
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/* The base charmap class. */
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/* */
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/* <Fields> */
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/* face :: A handle to the parent face object. */
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/* */
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/* flags :: A set of bit flags used to describe the charmap. */
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/* Each bit indicates that a given encoding is */
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/* supported. */
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/* */
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/* platform_id :: An ID number describing the platform for the */
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/* following encoding ID. This comes directly from */
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/* the TrueType specification and should be emulated */
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/* for other formats. */
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/* */
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/* encoding_id :: A platform specific encoding number. This also */
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/* comes from the TrueType specification and should be */
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/* emulated similarly. */
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/* */
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/* <Note> */
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/* We STRONGLY recommmend emulating a Unicode charmap for drivers */
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/* that do not support TrueType or OpenType. */
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/* */
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typedef struct FT_CharMapRec_
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{
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FT_Face face;
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FT_Encoding encoding;
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FT_UShort platform_id;
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FT_UShort encoding_id;
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} FT_CharMapRec;
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* B A S E O B J E C T C L A S S E S */
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/* */
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/*************************************************************************/
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/*************************************************************************/
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/*************************************************************************/
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/* */
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/* FreeType base face class */
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/* */
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/* <Struct> */
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/* FT_FaceRec */
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/* */
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/* <Description> */
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/* FreeType root face class structure. A face object models the */
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/* resolution and point-size independent data found in a font file. */
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/* */
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/* <Fields> */
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/* num_faces :: In the case where the face is located in a */
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/* collection (i.e., a resource which embeds */
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/* several faces), this is the total number of */
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/* faces found in the resource. 1 by default. */
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/* */
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/* face_index :: The index of the face in its resource. */
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/* Usually, this is 0 for all normal font */
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/* formats. It can be more in the case of */
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/* collections (which embed several fonts in a */
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/* single resource/file). */
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/* */
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/* face_flags :: A set of bit flags that give important */
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/* information about the face; see the */
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/* FT_FACE_FLAG_XXX macros for details. */
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/* */
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/* style_flags :: A set of bit flags indicating the style of */
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/* the face (i.e., italic, bold, underline, */
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/* etc). */
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/* */
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/* num_glyphs :: The total number of glyphs in the face. */
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/* */
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/* family_name :: The face's family name. This is an ASCII */
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/* string, usually in English, which describes */
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/* the typeface's family (like `Times New */
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/* Roman', `Bodoni', `Garamond', etc). This */
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/* is a least common denominator used to list */
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/* fonts. Some formats (TrueType & OpenType) */
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/* provide localized and Unicode versions of */
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/* this string. Applications should use the */
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/* format specific interface to access them. */
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/* */
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/* style_name :: The face's style name. This is an ASCII */
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/* string, usually in English, which describes */
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/* the typeface's style (like `Italic', */
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/* `Bold', `Condensed', etc). Not all font */
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/* formats provide a style name, so this field */
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/* is optional, and can be set to NULL. As */
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/* for `family_name', some formats provide */
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/* localized/Unicode versions of this string. */
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/* Applications should use the format specific */
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/* interface to access them. */
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/* */
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/* num_fixed_sizes :: The number of fixed sizes available in this */
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/* face. This should be set to 0 for scalable */
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/* fonts, unless its resource includes a */
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/* complete set of glyphs (called a `strike') */
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/* for the specified size. */
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/* */
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/* available_sizes :: An array of sizes specifying the available */
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/* bitmap/graymap sizes that are contained in */
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/* in the font resource. Should be set to */
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/* NULL if the field `num_fixed_sizes' is set */
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/* to 0. */
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/* */
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/* num_charmaps :: The total number of character maps in the */
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/* face. */
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/* */
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/* charmaps :: A table of pointers to the face's charmaps */
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/* Used to scan the list of available charmaps */
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/* this table might change after a call to */
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/* FT_Attach_File/Stream (e.g. when it used */
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/* to hook and additional encoding/CMap to */
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/* the face object). */
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/* */
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/* generic :: A field reserved for client uses. See the */
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/* FT_Generic type description. */
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/* */
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/* bbox :: The font bounding box. Coordinates are */
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/* expressed in font units (see units_per_EM). */
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/* The box is large enough to contain any */
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/* glyph from the font. Thus, bbox.yMax can */
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/* be seen as the `maximal ascender', */
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/* bbox.yMin as the `minimal descender', and */
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/* the maximal glyph width is given by */
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/* `bbox.xMax-bbox.xMin' (not to be confused */
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/* with the maximal _advance_width_). Only */
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/* relevant for scalable formats. */
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/* */
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/* units_per_EM :: The number of font units per EM square for */
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/* this face. This is typically 2048 for */
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/* TrueType fonts, 1000 for Type1 fonts, and */
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/* should be set to the (unrealistic) value 1 */
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/* for fixed-sizes fonts. Only relevant for */
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/* scalable formats. */
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/* */
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/* ascender :: The face's ascender is the vertical */
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/* distance from the baseline to the topmost */
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/* point of any glyph in the face. This */
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/* field's value is positive, expressed in */
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/* font units. Some font designs use a value */
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/* different from `bbox.yMax'. Only relevant */
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/* for scalable formats. */
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/* */
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/* descender :: The face's descender is the vertical */
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/* distance from the baseline to the */
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/* bottommost point of any glyph in the face. */
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/* This field's value is positive, expressed */
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/* in font units. Some font designs use a */
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/* value different from `-bbox.yMin'. Only */
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/* relevant for scalable formats. */
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/* */
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/* height :: The face's height is the vertical distance */
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/* from one baseline to the next when writing */
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/* several lines of text. Its value is always */
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/* positive, expressed in font units. The */
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/* value can be computed as */
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/* `ascender+descender+line_gap' where the */
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/* value of `line_gap' is also called */
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/* `external leading'. Only relevant for */
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/* scalable formats. */
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/* */
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/* max_advance_width :: The maximal advance width, in font units, */
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/* for all glyphs in this face. This can be */
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/* used to make word wrapping computations */
|
|
/* faster. Only relevant for scalable */
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/* formats. */
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/* */
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/* max_advance_height :: The maximal advance height, in font units, */
|
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/* for all glyphs in this face. This is only */
|
|
/* relevant for vertical layouts, and should */
|
|
/* be set to the `height' for fonts that do */
|
|
/* not provide vertical metrics. Only */
|
|
/* relevant for scalable formats. */
|
|
/* */
|
|
/* underline_position :: The position, in font units, of the */
|
|
/* underline line for this face. It's the */
|
|
/* center of the underlining stem. Only */
|
|
/* relevant for scalable formats. */
|
|
/* */
|
|
/* underline_thickness :: The thickness, in font units, of the */
|
|
/* underline for this face. Only relevant for */
|
|
/* scalable formats. */
|
|
/* */
|
|
/* driver :: A handle to the face's parent driver */
|
|
/* object. */
|
|
/* */
|
|
/* memory :: A handle to the face's parent memory */
|
|
/* object. Used for the allocation of */
|
|
/* subsequent objects. */
|
|
/* */
|
|
/* stream :: A handle to the face's stream. */
|
|
/* */
|
|
/* glyph :: The face's associated glyph slot(s). This */
|
|
/* object is created automatically with a new */
|
|
/* face object. However, certain kinds of */
|
|
/* applications (mainly tools like converters) */
|
|
/* can need more than one slot to ease their */
|
|
/* task. */
|
|
/* */
|
|
/* sizes_list :: The list of child sizes for this face. */
|
|
/* */
|
|
/* max_points :: The maximal number of points used to store */
|
|
/* the vectorial outline of any glyph in this */
|
|
/* face. If this value cannot be known in */
|
|
/* advance, or if the face isn't scalable, */
|
|
/* this should be set to 0. Only relevant for */
|
|
/* scalable formats. */
|
|
/* */
|
|
/* max_contours :: The maximal number of contours used to */
|
|
/* store the vectorial outline of any glyph in */
|
|
/* this face. If this value cannot be known */
|
|
/* in advance, or if the face isn't scalable, */
|
|
/* this should be set to 0. Only relevant for */
|
|
/* scalable formats. */
|
|
/* */
|
|
/* transform_matrix :: A 2x2 matrix of 16.16 coefficients used */
|
|
/* to transform glyph outlines after they are */
|
|
/* loaded from the font. Only used by the */
|
|
/* convenience functions. */
|
|
/* */
|
|
/* transform_delta :: A translation vector used to transform */
|
|
/* glyph outlines after they are loaded from */
|
|
/* the font. Only used by the convenience */
|
|
/* functions. */
|
|
/* */
|
|
/* transform_flags :: Some flags used to classify the transform. */
|
|
/* Only used by the convenience functions. */
|
|
/* */
|
|
typedef struct FT_FaceRec_
|
|
{
|
|
FT_Long num_faces;
|
|
FT_Long face_index;
|
|
|
|
FT_Long face_flags;
|
|
FT_Long style_flags;
|
|
|
|
FT_Long num_glyphs;
|
|
|
|
FT_String* family_name;
|
|
FT_String* style_name;
|
|
|
|
FT_Int num_fixed_sizes;
|
|
FT_Bitmap_Size* available_sizes;
|
|
|
|
/* the face's table of available charmaps */
|
|
FT_Int num_charmaps;
|
|
FT_CharMap* charmaps;
|
|
|
|
FT_Generic generic;
|
|
|
|
/* the following are only relevant for scalable outlines */
|
|
FT_BBox bbox;
|
|
|
|
FT_UShort units_per_EM;
|
|
FT_Short ascender;
|
|
FT_Short descender;
|
|
FT_Short height;
|
|
|
|
FT_Short max_advance_width;
|
|
FT_Short max_advance_height;
|
|
|
|
FT_Short underline_position;
|
|
FT_Short underline_thickness;
|
|
|
|
FT_GlyphSlot glyph;
|
|
FT_Size size;
|
|
|
|
/************************************************************/
|
|
/* The following fields should be considered private and */
|
|
/* rarely, if ever, used directly by client applications. */
|
|
|
|
FT_Driver driver;
|
|
FT_Memory memory;
|
|
FT_Stream stream;
|
|
|
|
FT_CharMap charmap;
|
|
FT_ListRec sizes_list;
|
|
|
|
FT_Generic autohint;
|
|
void* extensions;
|
|
|
|
FT_UShort max_points;
|
|
FT_Short max_contours;
|
|
|
|
FT_Matrix transform_matrix;
|
|
FT_Vector transform_delta;
|
|
FT_Int transform_flags;
|
|
|
|
} FT_FaceRec;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_SCALABLE */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face provides */
|
|
/* vectorial outlines (i.e., TrueType or Type1). This doesn't */
|
|
/* prevent embedding of bitmap strikes though, i.e., a given face can */
|
|
/* have both this bit set, and a `num_fixed_sizes' property > 0. */
|
|
/* */
|
|
#define FT_FACE_FLAG_SCALABLE 1
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_FIXED_SIZES */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face contains */
|
|
/* `fixed sizes', i.e., bitmap strikes for some given pixel sizes. */
|
|
/* See the `num_fixed_sizes' and `available_sizes' face properties */
|
|
/* for more information. */
|
|
/* */
|
|
#define FT_FACE_FLAG_FIXED_SIZES 2
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_FIXED_WIDTH */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face contains */
|
|
/* fixed-width characters (like Courier, Lucida, MonoType, etc.). */
|
|
/* */
|
|
#define FT_FACE_FLAG_FIXED_WIDTH 4
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_SFNT */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face uses the */
|
|
/* `sfnt' storage fomat. For now, this means TrueType or OpenType. */
|
|
/* */
|
|
#define FT_FACE_FLAG_SFNT 8
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_HORIZONTAL */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face contains */
|
|
/* horizontal glyph metrics. This should be set for all common */
|
|
/* formats, but who knows. */
|
|
/* */
|
|
#define FT_FACE_FLAG_HORIZONTAL 0x10
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_VERTICAL */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face contains */
|
|
/* vertical glyph metrics. If not set, the glyph loader will */
|
|
/* synthetize vertical metrics itself to help display vertical text */
|
|
/* correctly. */
|
|
/* */
|
|
#define FT_FACE_FLAG_VERTICAL 0x20
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_KERNING */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face contains */
|
|
/* kerning information. When set, this information can be retrieved */
|
|
/* through the function FT_Get_Kerning(). Note that when unset, this */
|
|
/* function will always return the kerning vector (0,0). */
|
|
/* */
|
|
#define FT_FACE_FLAG_KERNING 0x40
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_FAST_GLYPHS */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that the glyphs in a given */
|
|
/* font can be retrieved very quickly, and that a glyph cache is thus */
|
|
/* not necessary for any of its child size objects. */
|
|
/* */
|
|
/* This flag should really be set for fixed-size formats like FNT, */
|
|
/* where each glyph bitmap is available directly in binary form */
|
|
/* without any kind of compression. */
|
|
/* */
|
|
#define FT_FACE_FLAG_FAST_GLYPHS 0x80
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_MULTIPLE_MASTERS */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that the font contains */
|
|
/* multiple masters and is capable of interpolating between them. */
|
|
/* */
|
|
#define FT_FACE_FLAG_MULTIPLE_MASTERS 0x100
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_FACE_FLAG_EXTERNAL_STREAM */
|
|
/* */
|
|
/* <Description> */
|
|
/* This bit field is used internally by FreeType to indicate that */
|
|
/* a face's stream was provided by the client application and should */
|
|
/* not be destroyed by FT_Done_Face(). */
|
|
/* */
|
|
#define FT_FACE_FLAG_EXTERNAL_STREAM 0x4000
|
|
|
|
|
|
#define FT_HAS_HORIZONTAL( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_HORIZONTAL )
|
|
#define FT_HAS_VERTICAL( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_VERTICAL )
|
|
#define FT_HAS_KERNING( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_KERNING )
|
|
#define FT_IS_SCALABLE( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_SCALABLE )
|
|
#define FT_IS_SFNT( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_SFNT )
|
|
#define FT_IS_FIXED_WIDTH( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_FIXED_WIDTH )
|
|
#define FT_HAS_FIXED_SIZES( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_FIXED_SIZES )
|
|
#define FT_HAS_FAST_GLYPHS( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_FAST_GLYPHS )
|
|
|
|
#define FT_HAS_MULTIPLE_MASTERS( face ) \
|
|
( face->face_flags & FT_FACE_FLAG_MULTIPLE_MASTERS )
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_STYLE_FLAG_ITALIC */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face is */
|
|
/* italicized. */
|
|
/* */
|
|
#define FT_STYLE_FLAG_ITALIC 1
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_STYLE_FLAG_BOLD */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used to indicate that a given face is */
|
|
/* emboldened. */
|
|
/* */
|
|
#define FT_STYLE_FLAG_BOLD 2
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* FreeType base size metrics */
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Size_Metrics */
|
|
/* */
|
|
/* <Description> */
|
|
/* The size metrics structure returned scaled important distances for */
|
|
/* a given size object. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* x_ppem :: The character width, expressed in integer pixels. */
|
|
/* This is the width of the EM square expressed in */
|
|
/* pixels, hence the term `ppem' (pixels per EM). */
|
|
/* */
|
|
/* y_ppem :: The character height, expressed in integer pixels. */
|
|
/* This is the height of the EM square expressed in */
|
|
/* pixels, hence the term `ppem' (pixels per EM). */
|
|
/* */
|
|
/* x_scale :: A simple 16.16 fixed point format coefficient used */
|
|
/* to scale horizontal distances expressed in font */
|
|
/* units to fractional (26.6) pixel coordinates. */
|
|
/* */
|
|
/* y_scale :: A simple 16.16 fixed point format coefficient used */
|
|
/* to scale vertical distances expressed in font */
|
|
/* units to fractional (26.6) pixel coordinates. */
|
|
/* */
|
|
/* x_resolution :: The horizontal device resolution for this size */
|
|
/* object, expressed in integer dots per inches */
|
|
/* (dpi). As a convention, fixed font formats set */
|
|
/* this value to 72. */
|
|
/* */
|
|
/* y_resolution :: The vertical device resolution for this size */
|
|
/* object, expressed in integer dots per inches */
|
|
/* (dpi). As a convention, fixed font formats set */
|
|
/* this value to 72. */
|
|
/* */
|
|
/* ascender :: The ascender, expressed in 26.6 fixed point */
|
|
/* pixels. Always positive. */
|
|
/* */
|
|
/* descender :: The descender, expressed in 26.6 fixed point */
|
|
/* pixels. Always positive. */
|
|
/* */
|
|
/* height :: The text height, expressed in 26.6 fixed point */
|
|
/* pixels. Always positive. */
|
|
/* */
|
|
/* max_advance :: Maximum horizontal advance, expressed in 26.6 */
|
|
/* fixed point pixels. Always positive. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The values of `ascender', `descender', and `height' are only the */
|
|
/* scaled versions of `face->ascender', `face->descender', and */
|
|
/* `face->height'. */
|
|
/* */
|
|
/* Unfortunately, due to glyph hinting, these values might not be */
|
|
/* exact for certain fonts, they thus must be treated as unreliable */
|
|
/* with an error margin of at least one pixel! */
|
|
/* */
|
|
/* Indeed, the only way to get the exact pixel ascender and descender */
|
|
/* is to render _all_ glyphs. As this would be a definite */
|
|
/* performance hit, it is up to client applications to perform such */
|
|
/* computations. */
|
|
/* */
|
|
typedef struct FT_Size_Metrics_
|
|
{
|
|
FT_UShort x_ppem; /* horizontal pixels per EM */
|
|
FT_UShort y_ppem; /* vertical pixels per EM */
|
|
|
|
FT_Fixed x_scale; /* two scales used to convert font units */
|
|
FT_Fixed y_scale; /* to 26.6 frac. pixel coordinates.. */
|
|
|
|
FT_Pos ascender; /* ascender in 26.6 frac. pixels */
|
|
FT_Pos descender; /* descender in 26.6 frac. pixels */
|
|
FT_Pos height; /* text height in 26.6 frac. pixels */
|
|
FT_Pos max_advance; /* max horizontal advance, in 26.6 pixels */
|
|
|
|
} FT_Size_Metrics;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* FreeType base size class */
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_SizeRec */
|
|
/* */
|
|
/* <Description> */
|
|
/* FreeType root size class structure. A size object models the */
|
|
/* resolution and pointsize dependent data of a given face. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* face :: Handle to the parent face object. */
|
|
/* */
|
|
/* generic :: A typeless pointer, which is unused by the FreeType */
|
|
/* library or any of its drivers. It can be used by */
|
|
/* client applications to link their own data to each size */
|
|
/* object. */
|
|
/* */
|
|
/* metrics :: Metrics for this size object. This field is read-only. */
|
|
/* */
|
|
typedef struct FT_SizeRec_
|
|
{
|
|
FT_Face face; /* parent face object */
|
|
FT_Generic generic; /* generic pointer for client uses */
|
|
FT_Size_Metrics metrics; /* size metrics */
|
|
|
|
} FT_SizeRec;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_SubGlyph */
|
|
/* */
|
|
/* <Description> */
|
|
/* The subglyph structure is an internal object used to describe */
|
|
/* subglyphs (for example, in the case of composites). */
|
|
/* */
|
|
/* <Note> */
|
|
/* The subglyph implementation is not part of the high-level API, */
|
|
/* hence the forward structure declaration. */
|
|
/* */
|
|
typedef struct FT_SubGlyph_ FT_SubGlyph;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_GlyphLoader */
|
|
/* */
|
|
/* <Description> */
|
|
/* The glyph loader is an internal object used to load several glyphs */
|
|
/* together (for example, in the case of composites). */
|
|
/* */
|
|
/* <Note> */
|
|
/* The glyph loader implementation is not part of the high-level API, */
|
|
/* hence the forward structure declaration. */
|
|
/* */
|
|
typedef struct FT_GlyphLoader_ FT_GlyphLoader;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* FreeType Glyph Slot base class */
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_GlyphSlotRec */
|
|
/* */
|
|
/* <Description> */
|
|
/* FreeType root glyph slot class structure. A glyph slot is a */
|
|
/* container where individual glyphs can be loaded, be they */
|
|
/* vectorial or bitmap/graymaps. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* library :: A handle to the FreeType library instance */
|
|
/* this slot belongs to. */
|
|
/* */
|
|
/* face :: A handle to the parent face object. */
|
|
/* */
|
|
/* next :: In some cases (like some font tools), several */
|
|
/* glyph slots per face object can be a good */
|
|
/* thing. As this is rare, the glyph slots are */
|
|
/* listed through a direct, single-linked list */
|
|
/* using its `next' field. */
|
|
/* */
|
|
/* generic :: A typeless pointer which is unused by the */
|
|
/* FreeType library or any of its drivers. It */
|
|
/* can be used by client applications to link */
|
|
/* their own data to each size object. */
|
|
/* */
|
|
/* metrics :: The metrics of the last loaded glyph in the */
|
|
/* slot. The returned values depend on the last */
|
|
/* load flags (see the FT_Load_Glyph() API */
|
|
/* function) and can be expressed either in 26.6 */
|
|
/* fractional pixels or font units. */
|
|
/* */
|
|
/* Note that even when the glyph image is */
|
|
/* transformed, the metrics are not. */
|
|
/* */
|
|
/* linearHoriAdvance :: For scalable formats only, this field holds */
|
|
/* the linearly scaled horizontal advance width */
|
|
/* for the glyph (i.e. the scaled and unhinted */
|
|
/* value of the hori advance). This can be */
|
|
/* important to perform correct WYSIWYG layout */
|
|
/* */
|
|
/* Note that this value is expressed by default */
|
|
/* in 16.16 pixels. However, when the glyph is */
|
|
/* loaded with the FT_LOAD_UNSCALED_LINEAR flag, */
|
|
/* this field contains simply the value of the */
|
|
/* advance in original font units. */
|
|
/* */
|
|
/* linearVertAdvance :: For scalable formats only, this field holds */
|
|
/* the linearly scaled vertical advance height */
|
|
/* for the glyph. See linearHoriAdvance for */
|
|
/* comments. */
|
|
/* */
|
|
/* advance :: This is the transformed advance width for the */
|
|
/* glyph. */
|
|
/* */
|
|
/* format :: This field indicates the format of the image */
|
|
/* contained in the glyph slot. Typically */
|
|
/* ft_glyph_format_bitmap, */
|
|
/* ft_glyph_format_outline, and */
|
|
/* ft_glyph_format_composite, but others are */
|
|
/* possible. */
|
|
/* */
|
|
/* bitmap :: This field is used as a bitmap descriptor */
|
|
/* when the slot format is */
|
|
/* ft_glyph_format_bitmap. Note that the */
|
|
/* address and content of the bitmap buffer can */
|
|
/* change between calls of FT_Load_Glyph() and a */
|
|
/* few other functions. */
|
|
/* */
|
|
/* bitmap_left :: This is the bitmap's left bearing expressed */
|
|
/* in integer pixels. Of course, this is only */
|
|
/* valid if the format is */
|
|
/* ft_glyph_format_bitmap. */
|
|
/* */
|
|
/* bitmap_top :: This is the bitmap's top bearing expressed in */
|
|
/* integer pixels. Remember that this is the */
|
|
/* distance from the baseline to the top-most */
|
|
/* glyph scanline, upwards y-coordinates being */
|
|
/* *positive*. */
|
|
/* */
|
|
/* outline :: The outline descriptor for the current glyph */
|
|
/* image if its format is */
|
|
/* ft_glyph_bitmap_outline. */
|
|
/* */
|
|
/* num_subglyphs :: The number of subglyphs in a composite glyph. */
|
|
/* This format is only valid for the composite */
|
|
/* glyph format, that should normally only be */
|
|
/* loaded with the FT_LOAD_NO_RECURSE flag. */
|
|
/* */
|
|
/* subglyphs :: An array of subglyph descriptors for */
|
|
/* composite glyphs. There are `num_subglyphs' */
|
|
/* elements in there. */
|
|
/* */
|
|
/* control_data :: Certain font drivers can also return the */
|
|
/* control data for a given glyph image (e.g. */
|
|
/* TrueType bytecode, Type 1 charstrings, etc.). */
|
|
/* This field is a pointer to such data. */
|
|
/* */
|
|
/* control_len :: This is the length in bytes of the control */
|
|
/* data. */
|
|
/* */
|
|
/* other :: Really wicked formats can use this pointer to */
|
|
/* present their own glyph image to client apps. */
|
|
/* Note that the app will need to know about the */
|
|
/* image format. */
|
|
/* */
|
|
/* loader :: This is a private object for the glyph slot. */
|
|
/* Do not touch this. */
|
|
/* */
|
|
/* <Note> */
|
|
/* If FT_Load_Glyph() is called with default flags (FT_LOAD_DEFAULT), */
|
|
/* the glyph image is loaded in the glyph slot in its native format */
|
|
/* (e.g. a vectorial outline for TrueType and Type 1 formats). */
|
|
/* */
|
|
/* This image can later be converted into a bitmap by calling */
|
|
/* FT_Render_Glyph(). This function finds the current renderer for */
|
|
/* the native image's format then invokes it. */
|
|
/* */
|
|
/* The renderer is in charge of transforming the native image through */
|
|
/* the slot's face transformation fields, then convert it into a */
|
|
/* bitmap that is returned in `slot->bitmap'. */
|
|
/* */
|
|
/* Note that `slot->bitmap_left' and `slot->bitmap_top' are also used */
|
|
/* to specify the position of the bitmap relative to the current pen */
|
|
/* position (e.g. coordinates [0,0] on the baseline). Of course, */
|
|
/* `slot->format' is also changed to `ft_glyph_format_bitmap' . */
|
|
/* */
|
|
typedef struct FT_GlyphSlotRec_
|
|
{
|
|
FT_Library library;
|
|
FT_Face face;
|
|
FT_GlyphSlot next;
|
|
FT_UInt flags;
|
|
FT_Generic generic;
|
|
|
|
FT_Glyph_Metrics metrics;
|
|
FT_Fixed linearHoriAdvance;
|
|
FT_Fixed linearVertAdvance;
|
|
FT_Vector advance;
|
|
|
|
FT_Glyph_Format format;
|
|
|
|
FT_Bitmap bitmap;
|
|
FT_Int bitmap_left;
|
|
FT_Int bitmap_top;
|
|
|
|
FT_Outline outline;
|
|
|
|
FT_UInt num_subglyphs;
|
|
FT_SubGlyph* subglyphs;
|
|
|
|
void* control_data;
|
|
long control_len;
|
|
|
|
void* other;
|
|
|
|
/* private fields */
|
|
FT_GlyphLoader* loader;
|
|
|
|
} FT_GlyphSlotRec;
|
|
|
|
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
/* */
|
|
/* F U N C T I O N S */
|
|
/* */
|
|
/*************************************************************************/
|
|
/*************************************************************************/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Init_FreeType */
|
|
/* */
|
|
/* <Description> */
|
|
/* Initializes a new FreeType library object. The set of drivers */
|
|
/* that are registered by this function is determined at build time. */
|
|
/* */
|
|
/* <Output> */
|
|
/* library :: A handle to a new library object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Init_FreeType( FT_Library* library );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Done_FreeType */
|
|
/* */
|
|
/* <Description> */
|
|
/* Destroys a given FreeType library object and all of its childs, */
|
|
/* including resources, drivers, faces, sizes, etc. */
|
|
/* */
|
|
/* <Input> */
|
|
/* library :: A handle to the target library object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Done_FreeType( FT_Library library );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Enum> */
|
|
/* FT_Open_Flags */
|
|
/* */
|
|
/* <Description> */
|
|
/* An enumeration used to list the bit flags used within */
|
|
/* FT_Open_Args(). */
|
|
/* */
|
|
/* <Fields> */
|
|
/* ft_open_memory :: This is a memory-based stream. */
|
|
/* */
|
|
/* ft_open_stream :: Copy the stream from the `stream' field. */
|
|
/* */
|
|
/* ft_open_pathname :: Create a new input stream from a C pathname. */
|
|
/* */
|
|
/* ft_open_driver :: Use the `driver' field. */
|
|
/* */
|
|
/* ft_open_params :: Use the `num_params' & `params' field. */
|
|
/* */
|
|
typedef enum
|
|
{
|
|
ft_open_memory = 1,
|
|
ft_open_stream = 2,
|
|
ft_open_pathname = 4,
|
|
ft_open_driver = 8,
|
|
ft_open_params = 16
|
|
|
|
} FT_Open_Flags;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Parameter */
|
|
/* */
|
|
/* <Description> */
|
|
/* A simple structure used to pass more or less generic parameters */
|
|
/* to FT_Open_Face(). */
|
|
/* */
|
|
/* <Fields> */
|
|
/* tag :: A 4-byte identification tag. */
|
|
/* */
|
|
/* data :: A pointer to the parameter data. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The id and function of parameters are driver-specific. */
|
|
/* */
|
|
typedef struct FT_Parameter_
|
|
{
|
|
FT_ULong tag;
|
|
FT_Pointer data;
|
|
|
|
} FT_Parameter;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Struct> */
|
|
/* FT_Open_Args */
|
|
/* */
|
|
/* <Description> */
|
|
/* A structure used to indicate how to open a new font file/stream. */
|
|
/* A pointer to such a structure can be used as a parameter for the */
|
|
/* functions FT_Open_Face() & FT_Attach_Stream(). */
|
|
/* */
|
|
/* <Fields> */
|
|
/* flags :: A set of bit flags indicating how to use the */
|
|
/* structure. */
|
|
/* */
|
|
/* memory_base :: The first byte of the file in memory. */
|
|
/* */
|
|
/* memory_size :: The size in bytes of the file in memory. */
|
|
/* */
|
|
/* pathname :: A pointer to an 8-bit file pathname. */
|
|
/* */
|
|
/* stream :: A handle to a source stream object. */
|
|
/* */
|
|
/* driver :: This field is exclusively used by FT_Open_Face(); */
|
|
/* it simply specifies the font driver to use to open */
|
|
/* the face. If set to 0, FreeType will try to load */
|
|
/* the face with each one of the drivers in its list. */
|
|
/* */
|
|
/* num_params :: The number of extra parameters. */
|
|
/* */
|
|
/* params :: Extra parameters passed to the font driver when */
|
|
/* opening a new face. */
|
|
/* */
|
|
/* <Note> */
|
|
/* `stream_type' determines which fields are used to create a new */
|
|
/* input stream. */
|
|
/* */
|
|
/* If it is `ft_stream_memory', a new memory-based stream will be */
|
|
/* created using the memory block specified by `memory_base' and */
|
|
/* `memory_size'. */
|
|
/* */
|
|
/* If it is `ft_stream_pathname', a new stream will be created with */
|
|
/* the `pathname' field, calling the system-specific FT_New_Stream() */
|
|
/* function. */
|
|
/* */
|
|
/* If is is `ft_stream_copy', then the content of `stream' will be */
|
|
/* copied to a new input stream object. The object will be closed */
|
|
/* and destroyed when the face is destroyed itself. Note that this */
|
|
/* means that you should not close the stream before the library */
|
|
/* does! */
|
|
/* */
|
|
typedef struct FT_Open_Args_
|
|
{
|
|
FT_Open_Flags flags;
|
|
FT_Byte* memory_base;
|
|
FT_Long memory_size;
|
|
FT_String* pathname;
|
|
FT_Stream stream;
|
|
FT_Module driver;
|
|
FT_Int num_params;
|
|
FT_Parameter* params;
|
|
|
|
} FT_Open_Args;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_New_Face */
|
|
/* */
|
|
/* <Description> */
|
|
/* Creates a new face object from a given resource and typeface index */
|
|
/* using a pathname to the font file. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* library :: A handle to the library resource. */
|
|
/* */
|
|
/* <Input> */
|
|
/* pathname :: A path to the font file. */
|
|
/* */
|
|
/* face_index :: The index of the face within the resource. The */
|
|
/* first face has index 0. */
|
|
/* <Output> */
|
|
/* aface :: A handle to a new face object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* Unlike FreeType 1.x, this function automatically creates a glyph */
|
|
/* slot for the face object which can be accessed directly through */
|
|
/* `face->glyph'. */
|
|
/* */
|
|
/* Note that additional slots can be added to each face with the */
|
|
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
|
|
/* list through their `next' field. */
|
|
/* */
|
|
/* FT_New_Face() can be used to determine and/or check the font */
|
|
/* format of a given font resource. If the `face_index' field is */
|
|
/* negative, the function will _not_ return any face handle in */
|
|
/* `*face'. Its return value should be 0 if the resource is */
|
|
/* recognized, or non-zero if not. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_New_Face( FT_Library library,
|
|
const char* filepathname,
|
|
FT_Long face_index,
|
|
FT_Face* face );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_New_Memory_Face */
|
|
/* */
|
|
/* <Description> */
|
|
/* Creates a new face object from a given resource and typeface index */
|
|
/* using a font file already loaded into memory. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* library :: A handle to the library resource. */
|
|
/* */
|
|
/* <Input> */
|
|
/* file_base :: A pointer to the beginning of the font data. */
|
|
/* */
|
|
/* file_size :: The size of the memory chunk used by the font data. */
|
|
/* */
|
|
/* face_index :: The index of the face within the resource. The */
|
|
/* first face has index 0. */
|
|
/* <Output> */
|
|
/* face :: A handle to a new face object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* Unlike FreeType 1.x, this function automatically creates a glyph */
|
|
/* slot for the face object which can be accessed directly through */
|
|
/* `face->glyph'. */
|
|
/* */
|
|
/* Note that additional slots can be added to each face with the */
|
|
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
|
|
/* list through their `next' field. */
|
|
/* */
|
|
/* FT_New_Memory_Face() can be used to determine and/or check the */
|
|
/* font format of a given font resource. If the `face_index' field */
|
|
/* is negative, the function will _not_ return any face handle in */
|
|
/* `*face'. Its return value should be 0 if the resource is */
|
|
/* recognized, or non-zero if not. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_New_Memory_Face( FT_Library library,
|
|
FT_Byte* file_base,
|
|
FT_Long file_size,
|
|
FT_Long face_index,
|
|
FT_Face* face );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Open_Face */
|
|
/* */
|
|
/* <Description> */
|
|
/* Opens a face object from a given resource and typeface index using */
|
|
/* an `FT_Open_Args' structure. If the face object doesn't exist, it */
|
|
/* will be created. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* library :: A handle to the library resource. */
|
|
/* */
|
|
/* <Input> */
|
|
/* args :: A pointer to an `FT_Open_Args' structure which must */
|
|
/* be filled by the caller. */
|
|
/* */
|
|
/* face_index :: The index of the face within the resource. The */
|
|
/* first face has index 0. */
|
|
/* <Output> */
|
|
/* aface :: A handle to a new face object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* Unlike FreeType 1.x, this function automatically creates a glyph */
|
|
/* slot for the face object which can be accessed directly through */
|
|
/* `face->glyph'. */
|
|
/* */
|
|
/* Note that additional slots can be added to each face with the */
|
|
/* FT_New_GlyphSlot() API function. Slots are linked in a single */
|
|
/* list through their `next' field. */
|
|
/* */
|
|
/* FT_Open_Face() can be used to determine and/or check the font */
|
|
/* format of a given font resource. If the `face_index' field is */
|
|
/* negative, the function will _not_ return any face handle in */
|
|
/* `*face'. Its return value should be 0 if the resource is */
|
|
/* recognized, or non-zero if not. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Open_Face( FT_Library library,
|
|
FT_Open_Args* args,
|
|
FT_Long face_index,
|
|
FT_Face* face );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Attach_File */
|
|
/* */
|
|
/* <Description> */
|
|
/* `Attaches' a given font file to an existing face. This is usually */
|
|
/* to read additional information for a single face object. For */
|
|
/* example, it is used to read the AFM files that come with Type 1 */
|
|
/* fonts in order to add kerning data and other metrics. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: The target face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* filepathname :: An 8-bit pathname naming the `metrics' file. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* If your font file is in memory, or if you want to provide your */
|
|
/* own input stream object, use FT_Attach_Stream(). */
|
|
/* */
|
|
/* The meaning of the `attach' action (i.e., what really happens when */
|
|
/* the new file is read) is not fixed by FreeType itself. It really */
|
|
/* depends on the font format (and thus the font driver). */
|
|
/* */
|
|
/* Client applications are expected to know what they are doing */
|
|
/* when invoking this function. Most drivers simply do not implement */
|
|
/* file attachments. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Attach_File( FT_Face face,
|
|
const char* filepathname );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Attach_Stream */
|
|
/* */
|
|
/* <Description> */
|
|
/* This function is similar to FT_Attach_File() with the exception */
|
|
/* that it reads the attachment from an arbitrary stream. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: The target face object. */
|
|
/* */
|
|
/* parameters :: A pointer to an FT_Open_Args structure used to */
|
|
/* describe the input stream to FreeType. */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The meaning of the `attach' (i.e. what really happens when the */
|
|
/* new file is read) is not fixed by FreeType itself. It really */
|
|
/* depends on the font format (and thus the font driver). */
|
|
/* */
|
|
/* Client applications are expected to know what they are doing */
|
|
/* when invoking this function. Most drivers simply do not implement */
|
|
/* file attachments. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Attach_Stream( FT_Face face,
|
|
FT_Open_Args* parameters );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Done_Face */
|
|
/* */
|
|
/* <Description> */
|
|
/* Discards a given face object, as well as all of its child slots */
|
|
/* and sizes. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to a target face object. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Done_Face( FT_Face face );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Set_Char_Size */
|
|
/* */
|
|
/* <Description> */
|
|
/* Sets the character dimensions of a given face object. The */
|
|
/* `char_width' and `char_height' values are used for the width and */
|
|
/* height, respectively, expressed in 26.6 fractional points. */
|
|
/* */
|
|
/* If the horizontal or vertical resolution values are zero, a */
|
|
/* default value of 72dpi is used. Similarly, if one of the */
|
|
/* character dimensions is zero, its value is set equal to the other. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* size :: A handle to a target size object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* char_width :: The character width, in 26.6 fractional points. */
|
|
/* */
|
|
/* char_height :: The character height, in 26.6 fractional */
|
|
/* points. */
|
|
/* */
|
|
/* horz_resolution :: The horizontal resolution. */
|
|
/* */
|
|
/* vert_resolution :: The vertical resolution. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* When dealing with fixed-size faces (i.e., non-scalable formats), */
|
|
/* use the function FT_Set_Pixel_Sizes(). */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Set_Char_Size( FT_Face face,
|
|
FT_F26Dot6 char_width,
|
|
FT_F26Dot6 char_height,
|
|
FT_UInt horz_resolution,
|
|
FT_UInt vert_resolution );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Set_Pixel_Sizes */
|
|
/* */
|
|
/* <Description> */
|
|
/* Sets the character dimensions of a given face object. The width */
|
|
/* and height are expressed in integer pixels. */
|
|
/* */
|
|
/* If one of the character dimensions is zero, its value is set equal */
|
|
/* to the other. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: A handle to the target face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* pixel_width :: The character width, in integer pixels. */
|
|
/* */
|
|
/* pixel_height :: The character height, in integer pixels. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Set_Pixel_Sizes( FT_Face face,
|
|
FT_UInt pixel_width,
|
|
FT_UInt pixel_height );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Load_Glyph */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function used to load a single glyph within a given glyph slot, */
|
|
/* for a given size. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the target face object where the glyph */
|
|
/* will be loaded. */
|
|
/* */
|
|
/* glyph_index :: The index of the glyph in the font file. */
|
|
/* */
|
|
/* load_flags :: A flag indicating what to load for this glyph. The */
|
|
/* FT_LOAD_XXX constants can be used to control the */
|
|
/* glyph loading process (e.g., whether the outline */
|
|
/* should be scaled, whether to load bitmaps or not, */
|
|
/* whether to hint the outline, etc). */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* If the glyph image is not a bitmap, and if the bit flag */
|
|
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
|
|
/* transformed with the information passed to a previous call to */
|
|
/* FT_Set_Transform. */
|
|
/* */
|
|
/* Note that this also transforms the `face.glyph.advance' field, but */
|
|
/* *not* the values in `face.glyph.metrics'. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Load_Glyph( FT_Face face,
|
|
FT_UInt glyph_index,
|
|
FT_Int load_flags );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Load_Char */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function used to load a single glyph within a given glyph slot, */
|
|
/* for a given size, according to its character code. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to a target face object where the glyph */
|
|
/* will be loaded. */
|
|
/* */
|
|
/* char_code :: The glyph's character code, according to the */
|
|
/* current charmap used in the face. */
|
|
/* */
|
|
/* load_flags :: A flag indicating what to load for this glyph. The */
|
|
/* FT_LOAD_XXX constants can be used to control the */
|
|
/* glyph loading process (e.g., whether the outline */
|
|
/* should be scaled, whether to load bitmaps or not, */
|
|
/* whether to hint the outline, etc). */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* If the face has no current charmap, or if the character code */
|
|
/* is not defined in the charmap, this function will return an */
|
|
/* error. */
|
|
/* */
|
|
/* If the glyph image is not a bitmap, and if the bit flag */
|
|
/* FT_LOAD_IGNORE_TRANSFORM is unset, the glyph image will be */
|
|
/* transformed with the information passed to a previous call to */
|
|
/* FT_Set_Transform(). */
|
|
/* */
|
|
/* Note that this also transforms the `face.glyph.advance' field, but */
|
|
/* *not* the values in `face.glyph.metrics'. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Load_Char( FT_Face face,
|
|
FT_ULong char_code,
|
|
FT_Int load_flags );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_NO_SCALE */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the vector outline being loaded should not be scaled to 26.6 */
|
|
/* fractional pixels, but kept in notional units. */
|
|
/* */
|
|
#define FT_LOAD_NO_SCALE 1
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_NO_HINTING */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the vector outline being loaded should not be fitted to the pixel */
|
|
/* grid but simply scaled to 26.6 fractional pixels. */
|
|
/* */
|
|
/* This flag is ignored if FT_LOAD_NO_SCALE is set. */
|
|
/* */
|
|
#define FT_LOAD_NO_HINTING 2
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_RENDER */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the function should load the glyph and immediately convert it into */
|
|
/* a bitmap, if necessary, by calling FT_Render_Glyph(). */
|
|
/* */
|
|
/* Note that by default, FT_Load_Glyph() loads the glyph image in its */
|
|
/* native format. */
|
|
/* */
|
|
#define FT_LOAD_RENDER 4
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_NO_BITMAP */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the function should not load the bitmap or pixmap of a given */
|
|
/* glyph. This is useful when you do not want to load the embedded */
|
|
/* bitmaps of scalable formats, as the native glyph image will be */
|
|
/* loaded, and can then be rendered through FT_Render_Glyph(). */
|
|
/* */
|
|
#define FT_LOAD_NO_BITMAP 8
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_VERTICAL_LAYOUT */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the glyph image should be prepared for vertical layout. This */
|
|
/* basically means that `face.glyph.advance' will correspond to the */
|
|
/* vertical advance height (instead of the default horizontal */
|
|
/* advance width), and that the glyph image will translated to match */
|
|
/* the vertical bearings positions. */
|
|
/* */
|
|
#define FT_LOAD_VERTICAL_LAYOUT 16
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_FORCE_AUTOHINT */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the function should try to auto-hint the glyphs, even if a driver */
|
|
/* specific hinter is available. */
|
|
/* */
|
|
#define FT_LOAD_FORCE_AUTOHINT 32
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_CROP_BITMAP */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the font driver should try to crop the bitmap (i.e. remove all */
|
|
/* space around its black bits) when loading it. For now, this */
|
|
/* really only works with embedded bitmaps in TrueType fonts. */
|
|
/* */
|
|
#define FT_LOAD_CROP_BITMAP 64
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_PEDANTIC */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the glyph loader should perform a pedantic bytecode */
|
|
/* interpretation. Many popular fonts come with broken glyph */
|
|
/* programs. When this flag is set, loading them will return an */
|
|
/* error. Otherwise, errors are ignored by the loader, sometimes */
|
|
/* resulting in ugly glyphs. */
|
|
/* */
|
|
#define FT_LOAD_PEDANTIC 128
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the glyph loader should ignore the global advance width defined */
|
|
/* in the font. As far as we know, this is only used by the */
|
|
/* X-TrueType font server, in order to deal correctly with the */
|
|
/* incorrect metrics contained in DynaLab's TrueType CJK fonts. */
|
|
/* */
|
|
#define FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH 512
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_NO_RECURSE */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the glyph loader should not load composite glyph recursively. */
|
|
/* Rather, when a composite glyph is encountered, it should set */
|
|
/* the values of `num_subglyphs' and `subglyphs', as well as set */
|
|
/* `face->glyph.format' to ft_glyph_format_composite. */
|
|
/* */
|
|
/* This is for use by the auto-hinter and possibly other tools. */
|
|
/* For nearly all applications, this flags should be left unset */
|
|
/* when invoking FT_Load_Glyph(). */
|
|
/* */
|
|
/* Note that the flag forces the load of unscaled glyphs. */
|
|
/* */
|
|
#define FT_LOAD_NO_RECURSE 1024
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_IGNORE_TRANSFORM */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the glyph loader should not try to transform the loaded glyph */
|
|
/* image. */
|
|
/* */
|
|
#define FT_LOAD_IGNORE_TRANSFORM 2048
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_MONOCHROME */
|
|
/* */
|
|
/* <Description> */
|
|
/* Only used with FT_LOAD_RENDER set, it indicates that the returned */
|
|
/* glyph image should be 1-bit monochrome. This really tells the */
|
|
/* glyph loader to use `ft_render_mode_mono' when calling */
|
|
/* FT_Render_Glyph(). */
|
|
/* */
|
|
#define FT_LOAD_MONOCHROME 4096
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_LINEAR_DESIGN */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the function should return the linearly scaled metrics expressed */
|
|
/* in original font units, instead of the default 16.16 pixel values. */
|
|
/* */
|
|
#define FT_LOAD_LINEAR_DESIGN 8192
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Constant> */
|
|
/* FT_LOAD_DEFAULT */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-field constant, used with FT_Load_Glyph() to indicate that */
|
|
/* the function should try to load the glyph normally, i.e., */
|
|
/* embedded bitmaps are favored over outlines, vectors are always */
|
|
/* scaled and grid-fitted. */
|
|
/* */
|
|
#define FT_LOAD_DEFAULT 0
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Set_Transform */
|
|
/* */
|
|
/* <Description> */
|
|
/* A function used to set the transformation that is applied to glyph */
|
|
/* images just before they are converted to bitmaps in a glyph slot */
|
|
/* when FT_Render_Glyph() is called. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* face :: A handle to the source face object. */
|
|
/* */
|
|
/* <Input> */
|
|
/* matrix :: A pointer to the transformation's 2x2 matrix. Use 0 for */
|
|
/* the identity matrix. */
|
|
/* delta :: A pointer to the translation vector. Use 0 for the null */
|
|
/* vector. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The transformation is only applied to scalable image formats after */
|
|
/* the glyph has been loaded. It means that hinting is unaltered by */
|
|
/* the transformation and is performed on the character size given in */
|
|
/* the last call to FT_Set_Char_Sizes() or FT_Set_Pixel_Sizes(). */
|
|
/* */
|
|
FT_EXPORT_DEF( void ) FT_Set_Transform( FT_Face face,
|
|
FT_Matrix* matrix,
|
|
FT_Vector* delta );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Enum> */
|
|
/* FT_Render_Mode */
|
|
/* */
|
|
/* <Description> */
|
|
/* An enumeration type that lists the render modes supported by the */
|
|
/* FreeType 2 renderer(s). A renderer is in charge of converting a */
|
|
/* glyph image into a bitmap. */
|
|
/* */
|
|
/* <Fields> */
|
|
/* ft_render_mode_normal :: This is the default render mode; it */
|
|
/* corresponds to 8-bit anti-aliased */
|
|
/* bitmaps, using 256 levels of gray. */
|
|
/* */
|
|
/* ft_render_mode_mono :: This render mode is used to produce 1-bit */
|
|
/* monochrome bitmaps. */
|
|
/* */
|
|
/* <Note> */
|
|
/* There is no render mode to produce 8-bit `monochrome' bitmaps -- */
|
|
/* you have to make the conversion yourself if you need such things */
|
|
/* (besides, FreeType is not a graphics library). */
|
|
/* */
|
|
/* More modes might appear later for specific display modes (e.g. TV, */
|
|
/* LCDs, etc.). They will be supported through the simple addition */
|
|
/* of a renderer module, with no changes to the rest of the engine. */
|
|
/* */
|
|
typedef enum FT_Render_Mode_
|
|
{
|
|
ft_render_mode_normal = 0,
|
|
ft_render_mode_mono = 1
|
|
|
|
} FT_Render_Mode;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Render_Glyph */
|
|
/* */
|
|
/* <Description> */
|
|
/* Converts a given glyph image to a bitmap. It does so by */
|
|
/* inspecting the glyph image format, find the relevant renderer, and */
|
|
/* invoke it. */
|
|
/* */
|
|
/* <Input> */
|
|
/* slot :: A handle to the glyph slot containing the image to */
|
|
/* convert. */
|
|
/* */
|
|
/* render_mode :: This is the render mode used to render the glyph */
|
|
/* image into a bitmap. See FT_Render_Mode for a list */
|
|
/* of possible values. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Render_Glyph( FT_GlyphSlot slot,
|
|
FT_UInt render_mode );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Enum> */
|
|
/* FT_Kerning_Mode */
|
|
/* */
|
|
/* <Description> */
|
|
/* An enumeration used to specify which kerning values to return in */
|
|
/* FT_Get_Kerning(). */
|
|
/* */
|
|
/* <Fields> */
|
|
/* ft_kerning_default :: Return scaled and grid-fitted kerning */
|
|
/* distances (value is 0). */
|
|
/* */
|
|
/* ft_kerning_unfitted :: Return scaled but un-grid-fitted kerning */
|
|
/* distances. */
|
|
/* */
|
|
/* ft_kerning_unscaled :: Return the kerning vector in original font */
|
|
/* units. */
|
|
/* */
|
|
typedef enum FT_Kerning_Mode_
|
|
{
|
|
ft_kerning_default = 0,
|
|
ft_kerning_unfitted,
|
|
ft_kerning_unscaled
|
|
|
|
} FT_Kerning_Mode;
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Get_Kerning */
|
|
/* */
|
|
/* <Description> */
|
|
/* Returns the kerning vector between two glyphs of a same face. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to a source face object. */
|
|
/* */
|
|
/* left_glyph :: The index of the left glyph in the kern pair. */
|
|
/* */
|
|
/* right_glyph :: The index of the right glyph in the kern pair. */
|
|
/* */
|
|
/* kern_mode :: See FT_Kerning_Mode() for more information. */
|
|
/* Determines the scale/dimension of the returned */
|
|
/* kerning vector. */
|
|
/* */
|
|
/* <Output> */
|
|
/* kerning :: The kerning vector. This is in font units for */
|
|
/* scalable formats, and in pixels for fixed-sizes */
|
|
/* formats. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* Only horizontal layouts (left-to-right & right-to-left) are */
|
|
/* supported by this method. Other layouts, or more sophisticated */
|
|
/* kernings, are out of the scope of this API function -- they can be */
|
|
/* implemented through format-specific interfaces. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Get_Kerning( FT_Face face,
|
|
FT_UInt left_glyph,
|
|
FT_UInt right_glyph,
|
|
FT_UInt kern_mode,
|
|
FT_Vector* kerning );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Select_Charmap */
|
|
/* */
|
|
/* <Description> */
|
|
/* Selects a given charmap by its encoding tag (as listed in */
|
|
/* `freetype.h'). */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the source face object. */
|
|
/* */
|
|
/* encoding :: A handle to the selected charmap. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function will return an error if no charmap in the face */
|
|
/* corresponds to the encoding queried here. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Select_Charmap( FT_Face face,
|
|
FT_Encoding encoding );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Set_Charmap */
|
|
/* */
|
|
/* <Description> */
|
|
/* Selects a given charmap for character code to glyph index */
|
|
/* decoding. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the source face object. */
|
|
/* charmap :: A handle to the selected charmap. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function will return an error if the charmap is not part of */
|
|
/* the face (i.e., if it is not listed in the face->charmaps[] */
|
|
/* table). */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Error ) FT_Set_Charmap( FT_Face face,
|
|
FT_CharMap charmap );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Get_Char_Index */
|
|
/* */
|
|
/* <Description> */
|
|
/* Returns the glyph index of a given character code. This function */
|
|
/* uses a charmap object to do the translation. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: A handle to the source face object. */
|
|
/* */
|
|
/* charcode :: The character code. */
|
|
/* */
|
|
/* <Return> */
|
|
/* The glyph index. 0 means `undefined character code'. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_UInt ) FT_Get_Char_Index( FT_Face face,
|
|
FT_ULong charcode );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_MulDiv */
|
|
/* */
|
|
/* <Description> */
|
|
/* A very simple function used to perform the computation `(a*b)/c' */
|
|
/* with maximal accuracy (it uses a 64-bit intermediate integer */
|
|
/* whenever necessary). */
|
|
/* */
|
|
/* This function isn't necessarily as fast as some processor specific */
|
|
/* operations, but is at least completely portable. */
|
|
/* */
|
|
/* <Input> */
|
|
/* a :: The first multiplier. */
|
|
/* b :: The second multiplier. */
|
|
/* c :: The divisor. */
|
|
/* */
|
|
/* <Return> */
|
|
/* The result of `(a*b)/c'. This function never traps when trying to */
|
|
/* divide by zero; it simply returns `MaxInt' or `MinInt' depending */
|
|
/* on the signs of `a' and `b'. */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Long ) FT_MulDiv( FT_Long a,
|
|
FT_Long b,
|
|
FT_Long c );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_MulFix */
|
|
/* */
|
|
/* <Description> */
|
|
/* A very simple function used to perform the computation */
|
|
/* `(a*b)/0x10000' with maximal accuracy. Most of the time this is */
|
|
/* used to multiply a given value by a 16.16 fixed float factor. */
|
|
/* */
|
|
/* <Input> */
|
|
/* a :: The first multiplier. */
|
|
/* b :: The second multiplier. Use a 16.16 factor here whenever */
|
|
/* possible (see note below). */
|
|
/* */
|
|
/* <Return> */
|
|
/* The result of `(a*b)/0x10000'. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function has been optimized for the case where the absolute */
|
|
/* value of `a' is less than 2048, and `b' is a 16.16 scaling factor. */
|
|
/* As this happens mainly when scaling from notional units to */
|
|
/* fractional pixels in FreeType, it resulted in noticeable speed */
|
|
/* improvements between versions 2.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_DEF( FT_Long ) FT_MulFix( FT_Long a,
|
|
FT_Long b );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_DivFix */
|
|
/* */
|
|
/* <Description> */
|
|
/* A very simple function used to perform the computation */
|
|
/* `(a*0x10000)/b' with maximal accuracy. Most of the time, this is */
|
|
/* used to divide a given value by a 16.16 fixed float factor. */
|
|
/* */
|
|
/* <Input> */
|
|
/* a :: The first multiplier. */
|
|
/* b :: The second multiplier. Use a 16.16 factor here whenever */
|
|
/* possible (see note below). */
|
|
/* */
|
|
/* <Return> */
|
|
/* The result of `(a*0x10000)/b'. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The optimization for FT_DivFix() is simple: If (a << 16) fits in */
|
|
/* 32 bits, then the division is computed directly. Otherwise, we */
|
|
/* use a specialized version of the old FT_MulDiv64(). */
|
|
/* */
|
|
FT_EXPORT_DEF( FT_Long ) FT_DivFix( FT_Long a,
|
|
FT_Long b );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Vector_Transform */
|
|
/* */
|
|
/* <Description> */
|
|
/* Transforms a single vector through a 2x2 matrix. */
|
|
/* */
|
|
/* <InOut> */
|
|
/* vector :: The target vector to transform. */
|
|
/* */
|
|
/* <Input> */
|
|
/* matrix :: A pointer to the source 2x2 matrix. */
|
|
/* */
|
|
/* <MT-Note> */
|
|
/* Yes. */
|
|
/* */
|
|
/* <Note> */
|
|
/* The result is undefined if either `vector' or `matrix' is invalid. */
|
|
/* */
|
|
FT_EXPORT_DEF( void ) FT_Vector_Transform( FT_Vector* vec,
|
|
FT_Matrix* matrix );
|
|
|
|
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
|
|
#endif /* FREETYPE_H */
|
|
|
|
|
|
/* END */
|