188 lines
10 KiB
C
188 lines
10 KiB
C
/***************************************************************************/
|
|
/* */
|
|
/* ftadvanc.h */
|
|
/* */
|
|
/* Quick computation of advance widths (specification only). */
|
|
/* */
|
|
/* Copyright 2008-2015 by */
|
|
/* David Turner, Robert Wilhelm, and Werner Lemberg. */
|
|
/* */
|
|
/* This file is part of the FreeType project, and may only be used, */
|
|
/* modified, and distributed under the terms of the FreeType project */
|
|
/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
|
|
/* this file you indicate that you have read the license and */
|
|
/* understand and accept it fully. */
|
|
/* */
|
|
/***************************************************************************/
|
|
|
|
|
|
#ifndef FTADVANC_H_
|
|
#define FTADVANC_H_
|
|
|
|
|
|
#include <ft2build.h>
|
|
#include FT_FREETYPE_H
|
|
|
|
#ifdef FREETYPE_H
|
|
#error "freetype.h of FreeType 1 has been loaded!"
|
|
#error "Please fix the directory search order for header files"
|
|
#error "so that freetype.h of FreeType 2 is found first."
|
|
#endif
|
|
|
|
|
|
FT_BEGIN_HEADER
|
|
|
|
|
|
/**************************************************************************
|
|
*
|
|
* @section:
|
|
* quick_advance
|
|
*
|
|
* @title:
|
|
* Quick retrieval of advance values
|
|
*
|
|
* @abstract:
|
|
* Retrieve horizontal and vertical advance values without processing
|
|
* glyph outlines, if possible.
|
|
*
|
|
* @description:
|
|
* This section contains functions to quickly extract advance values
|
|
* without handling glyph outlines, if possible.
|
|
*
|
|
* @order:
|
|
* FT_Get_Advance
|
|
* FT_Get_Advances
|
|
*
|
|
*/
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Const> */
|
|
/* FT_ADVANCE_FLAG_FAST_ONLY */
|
|
/* */
|
|
/* <Description> */
|
|
/* A bit-flag to be OR-ed with the `flags' parameter of the */
|
|
/* @FT_Get_Advance and @FT_Get_Advances functions. */
|
|
/* */
|
|
/* If set, it indicates that you want these functions to fail if the */
|
|
/* corresponding hinting mode or font driver doesn't allow for very */
|
|
/* quick advance computation. */
|
|
/* */
|
|
/* Typically, glyphs that are either unscaled, unhinted, bitmapped, */
|
|
/* or light-hinted can have their advance width computed very */
|
|
/* quickly. */
|
|
/* */
|
|
/* Normal and bytecode hinted modes that require loading, scaling, */
|
|
/* and hinting of the glyph outline, are extremely slow by */
|
|
/* comparison. */
|
|
/* */
|
|
#define FT_ADVANCE_FLAG_FAST_ONLY 0x20000000L
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Get_Advance */
|
|
/* */
|
|
/* <Description> */
|
|
/* Retrieve the advance value of a given glyph outline in an */
|
|
/* @FT_Face. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: The source @FT_Face handle. */
|
|
/* */
|
|
/* gindex :: The glyph index. */
|
|
/* */
|
|
/* load_flags :: A set of bit flags similar to those used when */
|
|
/* calling @FT_Load_Glyph, used to determine what kind */
|
|
/* of advances you need. */
|
|
/* <Output> */
|
|
/* padvance :: The advance value. If scaling is performed (based on */
|
|
/* the value of `load_flags'), the advance value is in */
|
|
/* 16.16 format. Otherwise, it is in font units. */
|
|
/* */
|
|
/* If @FT_LOAD_VERTICAL_LAYOUT is set, this is the */
|
|
/* vertical advance corresponding to a vertical layout. */
|
|
/* Otherwise, it is the horizontal advance in a */
|
|
/* horizontal layout. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
|
|
/* if the corresponding font backend doesn't have a quick way to */
|
|
/* retrieve the advances. */
|
|
/* */
|
|
/* A scaled advance is returned in 16.16 format but isn't transformed */
|
|
/* by the affine transformation specified by @FT_Set_Transform. */
|
|
/* */
|
|
FT_EXPORT( FT_Error )
|
|
FT_Get_Advance( FT_Face face,
|
|
FT_UInt gindex,
|
|
FT_Int32 load_flags,
|
|
FT_Fixed *padvance );
|
|
|
|
|
|
/*************************************************************************/
|
|
/* */
|
|
/* <Function> */
|
|
/* FT_Get_Advances */
|
|
/* */
|
|
/* <Description> */
|
|
/* Retrieve the advance values of several glyph outlines in an */
|
|
/* @FT_Face. */
|
|
/* */
|
|
/* <Input> */
|
|
/* face :: The source @FT_Face handle. */
|
|
/* */
|
|
/* start :: The first glyph index. */
|
|
/* */
|
|
/* count :: The number of advance values you want to retrieve. */
|
|
/* */
|
|
/* load_flags :: A set of bit flags similar to those used when */
|
|
/* calling @FT_Load_Glyph. */
|
|
/* */
|
|
/* <Output> */
|
|
/* padvance :: The advance values. This array, to be provided by the */
|
|
/* caller, must contain at least `count' elements. */
|
|
/* */
|
|
/* If scaling is performed (based on the value of */
|
|
/* `load_flags'), the advance values are in 16.16 format. */
|
|
/* Otherwise, they are in font units. */
|
|
/* */
|
|
/* If @FT_LOAD_VERTICAL_LAYOUT is set, these are the */
|
|
/* vertical advances corresponding to a vertical layout. */
|
|
/* Otherwise, they are the horizontal advances in a */
|
|
/* horizontal layout. */
|
|
/* */
|
|
/* <Return> */
|
|
/* FreeType error code. 0 means success. */
|
|
/* */
|
|
/* <Note> */
|
|
/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
|
|
/* if the corresponding font backend doesn't have a quick way to */
|
|
/* retrieve the advances. */
|
|
/* */
|
|
/* Scaled advances are returned in 16.16 format but aren't */
|
|
/* transformed by the affine transformation specified by */
|
|
/* @FT_Set_Transform. */
|
|
/* */
|
|
FT_EXPORT( FT_Error )
|
|
FT_Get_Advances( FT_Face face,
|
|
FT_UInt start,
|
|
FT_UInt count,
|
|
FT_Int32 load_flags,
|
|
FT_Fixed *padvances );
|
|
|
|
/* */
|
|
|
|
|
|
FT_END_HEADER
|
|
|
|
#endif /* FTADVANC_H_ */
|
|
|
|
|
|
/* END */
|