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Rev	Author	Line No.	Line
4680	right-hear	1	/***************************************************************************/
		2	/* */
		3	/* ftadvanc.h */
		4	/* */
		5	/* Quick computation of advance widths (specification only). */
		6	/* */
		7	/* Copyright 2008 by */
		8	/* David Turner, Robert Wilhelm, and Werner Lemberg. */
		9	/* */
		10	/* This file is part of the FreeType project, and may only be used, */
		11	/* modified, and distributed under the terms of the FreeType project */
		12	/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
		13	/* this file you indicate that you have read the license and */
		14	/* understand and accept it fully. */
		15	/* */
		16	/***************************************************************************/
		17
		18
		19	#ifndef __FTADVANC_H__
		20	#define __FTADVANC_H__
		21
		22
		23	#include
		24	#include FT_FREETYPE_H
		25
		26	#ifdef FREETYPE_H
		27	#error "freetype.h of FreeType 1 has been loaded!"
		28	#error "Please fix the directory search order for header files"
		29	#error "so that freetype.h of FreeType 2 is found first."
		30	#endif
		31
		32
		33	FT_BEGIN_HEADER
		34
		35
		36	/**************************************************************************
		37	*
		38	* @section:
		39	* quick_advance
		40	*
		41	* @title:
		42	* Quick retrieval of advance values
		43	*
		44	* @abstract:
		45	* Retrieve horizontal and vertical advance values without processing
		46	* glyph outlines, if possible.
		47	*
		48	* @description:
		49	* This section contains functions to quickly extract advance values
		50	* without handling glyph outlines, if possible.
		51	*/
		52
		53
		54	/*************************************************************************/
		55	/* */
		56	/* */
		57	/* FT_ADVANCE_FLAG_FAST_ONLY */
		58	/* */
		59	/* */
		60	/* A bit-flag to be OR-ed with the `flags' parameter of the */
		61	/* @FT_Get_Advance and @FT_Get_Advances functions. */
		62	/* */
		63	/* If set, it indicates that you want these functions to fail if the */
		64	/* corresponding hinting mode or font driver doesn't allow for very */
		65	/* quick advance computation. */
		66	/* */
		67	/* Typically, glyphs which are either unscaled, unhinted, bitmapped, */
		68	/* or light-hinted can have their advance width computed very */
		69	/* quickly. */
		70	/* */
		71	/* Normal and bytecode hinted modes, which require loading, scaling, */
		72	/* and hinting of the glyph outline, are extremely slow by */
		73	/* comparison. */
		74	/* */
		75	#define FT_ADVANCE_FLAG_FAST_ONLY 0x20000000UL
		76
		77
		78	/*************************************************************************/
		79	/* */
		80	/* */
		81	/* FT_Get_Advance */
		82	/* */
		83	/* */
		84	/* Retrieve the advance value of a given glyph outline in an */
		85	/* @FT_Face. By default, the unhinted advance is returned in font */
		86	/* units. */
		87	/* */
		88	/* */
		89	/* face :: The source @FT_Face handle. */
		90	/* */
		91	/* gindex :: The glyph index. */
		92	/* */
		93	/* load_flags :: A set of bit flags similar to those used when */
		94	/* calling @FT_Load_Glyph, used to determine what kind */
		95	/* of advances you need. */
		96	/* */
		97	/* padvance :: The advance value, in either font units or 16.16 */
		98	/* format. */
		99	/* */
		100	/* If @FT_LOAD_VERTICAL_LAYOUT is set, this is the */
		101	/* vertical advance corresponding to a vertical layout. */
		102	/* Otherwise, it is the horizontal advance in a */
		103	/* horizontal layout. */
		104	/* */
		105	/* */
		106	/* FreeType error code. 0 means success. */
		107	/* */
		108	/* */
		109	/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
		110	/* if the corresponding font backend doesn't have a quick way to */
		111	/* retrieve the advances. */
		112	/* */
		113	/* A scaled advance is returned in 16.16 format but isn't transformed */
		114	/* by the affine transformation specified by @FT_Set_Transform. */
		115	/* */
		116	FT_EXPORT( FT_Error )
		117	FT_Get_Advance( FT_Face face,
		118	FT_UInt gindex,
		119	FT_Int32 load_flags,
		120	FT_Fixed *padvance );
		121
		122
		123	/*************************************************************************/
		124	/* */
		125	/* */
		126	/* FT_Get_Advances */
		127	/* */
		128	/* */
		129	/* Retrieve the advance values of several glyph outlines in an */
		130	/* @FT_Face. By default, the unhinted advances are returned in font */
		131	/* units. */
		132	/* */
		133	/* */
		134	/* face :: The source @FT_Face handle. */
		135	/* */
		136	/* start :: The first glyph index. */
		137	/* */
		138	/* count :: The number of advance values you want to retrieve. */
		139	/* */
		140	/* load_flags :: A set of bit flags similar to those used when */
		141	/* calling @FT_Load_Glyph. */
		142	/* */
		143	/* */
		144	/* padvance :: The advances, in either font units or 16.16 format. */
		145	/* This array must contain at least `count' elements. */
		146	/* */
		147	/* If @FT_LOAD_VERTICAL_LAYOUT is set, these are the */
		148	/* vertical advances corresponding to a vertical layout. */
		149	/* Otherwise, they are the horizontal advances in a */
		150	/* horizontal layout. */
		151	/* */
		152	/* */
		153	/* FreeType error code. 0 means success. */
		154	/* */
		155	/* */
		156	/* This function may fail if you use @FT_ADVANCE_FLAG_FAST_ONLY and */
		157	/* if the corresponding font backend doesn't have a quick way to */
		158	/* retrieve the advances. */
		159	/* */
		160	/* Scaled advances are returned in 16.16 format but aren't */
		161	/* transformed by the affine transformation specified by */
		162	/* @FT_Set_Transform. */
		163	/* */
		164	FT_EXPORT( FT_Error )
		165	FT_Get_Advances( FT_Face face,
		166	FT_UInt start,
		167	FT_UInt count,
		168	FT_Int32 load_flags,
		169	FT_Fixed *padvances );
		170
		171	/* */
		172
		173
		174	FT_END_HEADER
		175
		176	#endif /* __FTADVANC_H__ */
		177
		178
		179	/* END */

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