WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/freetype/src/truetype/ttsubpix.c

Rev	Author	Line No.	Line
4349	Serge	1	/***************************************************************************/
		2	/* */
		3	/* ttsubpix.c */
		4	/* */
		5	/* TrueType Subpixel Hinting. */
		6	/* */
		7	/* Copyright 2010-2013 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	#include
		19	#include FT_INTERNAL_DEBUG_H
		20	#include FT_INTERNAL_CALC_H
		21	#include FT_INTERNAL_STREAM_H
		22	#include FT_INTERNAL_SFNT_H
		23	#include FT_TRUETYPE_TAGS_H
		24	#include FT_OUTLINE_H
		25	#include FT_TRUETYPE_DRIVER_H
		26
		27	#include "ttsubpix.h"
		28
		29
		30	#ifdef TT_CONFIG_OPTION_SUBPIXEL_HINTING
		31
		32	/*************************************************************************/
		33	/* */
		34	/* These rules affect how the TT Interpreter does hinting, with the */
		35	/* goal of doing subpixel hinting by (in general) ignoring x moves. */
		36	/* Some of these rules are fixes that go above and beyond the */
		37	/* stated techniques in the MS whitepaper on Cleartype, due to */
		38	/* artifacts in many glyphs. So, these rules make some glyphs render */
		39	/* better than they do in the MS rasterizer. */
		40	/* */
		41	/* "" string or 0 int/char indicates to apply to all glyphs. */
		42	/* "-" used as dummy placeholders, but any non-matching string works. */
		43	/* */
		44	/* Some of this could arguably be implemented in fontconfig, however: */
		45	/* */
		46	/* - Fontconfig can't set things on a glyph-by-glyph basis. */
		47	/* - The tweaks that happen here are very low-level, from an average */
		48	/* user's point of view and are best implemented in the hinter. */
		49	/* */
		50	/* The goal is to make the subpixel hinting techniques as generalized */
		51	/* as possible across all fonts to prevent the need for extra rules such */
		52	/* as these. */
		53	/* */
		54	/* The rule structure is designed so that entirely new rules can easily */
		55	/* be added when a new compatibility feature is discovered. */
		56	/* */
		57	/* The rule structures could also use some enhancement to handle ranges. */
		58	/* */
		59	/* **************** WORK IN PROGRESS ***************** */
		60	/* */
		61
		62	/* These are `classes' of fonts that can be grouped together and used in */
		63	/* rules below. A blank entry "" is required at the end of these! */
		64	#define FAMILY_CLASS_RULES_SIZE 7
		65
		66	static const SPH_Font_Class FAMILY_CLASS_Rules
		67	[FAMILY_CLASS_RULES_SIZE] =
		68	{
		69	{ "MS Legacy Fonts",
		70	{ "Aharoni",
		71	"Andale Mono",
		72	"Andalus",
		73	"Angsana New",
		74	"AngsanaUPC",
		75	"Arabic Transparent",
		76	"Arial Black",
		77	"Arial Narrow",
		78	"Arial Unicode MS",
		79	"Arial",
		80	"Batang",
		81	"Browallia New",
		82	"BrowalliaUPC",
		83	"Comic Sans MS",
		84	"Cordia New",
		85	"CordiaUPC",
		86	"Courier New",
		87	"DFKai-SB",
		88	"David Transparent",
		89	"David",
		90	"DilleniaUPC",
		91	"Estrangelo Edessa",
		92	"EucrosiaUPC",
		93	"FangSong_GB2312",
		94	"Fixed Miriam Transparent",
		95	"FrankRuehl",
		96	"Franklin Gothic Medium",
		97	"FreesiaUPC",
		98	"Garamond",
		99	"Gautami",
		100	"Georgia",
		101	"Gulim",
		102	"Impact",
		103	"IrisUPC",
		104	"JasmineUPC",
		105	"KaiTi_GB2312",
		106	"KodchiangUPC",
		107	"Latha",
		108	"Levenim MT",
		109	"LilyUPC",
		110	"Lucida Console",
		111	"Lucida Sans Unicode",
		112	"MS Gothic",
		113	"MS Mincho",
		114	"MV Boli",
		115	"Mangal",
		116	"Marlett",
		117	"Microsoft Sans Serif",
		118	"Mingliu",
		119	"Miriam Fixed",
		120	"Miriam Transparent",
		121	"Miriam",
		122	"Narkisim",
		123	"Palatino Linotype",
		124	"Raavi",
		125	"Rod Transparent",
		126	"Rod",
		127	"Shruti",
		128	"SimHei",
		129	"Simplified Arabic Fixed",
		130	"Simplified Arabic",
		131	"Simsun",
		132	"Sylfaen",
		133	"Symbol",
		134	"Tahoma",
		135	"Times New Roman",
		136	"Traditional Arabic",
		137	"Trebuchet MS",
		138	"Tunga",
		139	"Verdana",
		140	"Webdings",
		141	"Wingdings",
		142	"",
		143	},
		144	},
		145	{ "Core MS Legacy Fonts",
		146	{ "Arial Black",
		147	"Arial Narrow",
		148	"Arial Unicode MS",
		149	"Arial",
		150	"Comic Sans MS",
		151	"Courier New",
		152	"Garamond",
		153	"Georgia",
		154	"Impact",
		155	"Lucida Console",
		156	"Lucida Sans Unicode",
		157	"Microsoft Sans Serif",
		158	"Palatino Linotype",
		159	"Tahoma",
		160	"Times New Roman",
		161	"Trebuchet MS",
		162	"Verdana",
		163	"",
		164	},
		165	},
		166	{ "Apple Legacy Fonts",
		167	{ "Geneva",
		168	"Times",
		169	"Monaco",
		170	"Century",
		171	"Chalkboard",
		172	"Lobster",
		173	"Century Gothic",
		174	"Optima",
		175	"Lucida Grande",
		176	"Gill Sans",
		177	"Baskerville",
		178	"Helvetica",
		179	"Helvetica Neue",
		180	"",
		181	},
		182	},
		183	{ "Legacy Sans Fonts",
		184	{ "Andale Mono",
		185	"Arial Unicode MS",
		186	"Arial",
		187	"Century Gothic",
		188	"Comic Sans MS",
		189	"Franklin Gothic Medium",
		190	"Geneva",
		191	"Lucida Console",
		192	"Lucida Grande",
		193	"Lucida Sans Unicode",
		194	"Lucida Sans Typewriter",
		195	"Microsoft Sans Serif",
		196	"Monaco",
		197	"Tahoma",
		198	"Trebuchet MS",
		199	"Verdana",
		200	"",
		201	},
		202	},
		203
		204	{ "Misc Legacy Fonts",
		205	{ "Dark Courier", "", }, },
		206	{ "Verdana Clones",
		207	{ "DejaVu Sans",
		208	"Bitstream Vera Sans", "", }, },
		209	{ "Verdana and Clones",
		210	{ "DejaVu Sans",
		211	"Bitstream Vera Sans",
		212	"Verdana", "", }, },
		213	};
		214
		215
		216	/* Define this to force natural (i.e. not bitmap-compatible) widths. */
		217	/* The default leans strongly towards natural widths except for a few */
		218	/* legacy fonts where a selective combination produces nicer results. */
		219	/* #define FORCE_NATURAL_WIDTHS */
		220
		221
		222	/* Define `classes' of styles that can be grouped together and used in */
		223	/* rules below. A blank entry "" is required at the end of these! */
		224	#define STYLE_CLASS_RULES_SIZE 5
		225
		226	const SPH_Font_Class STYLE_CLASS_Rules
		227	[STYLE_CLASS_RULES_SIZE] =
		228	{
		229	{ "Regular Class",
		230	{ "Regular",
		231	"Book",
		232	"Medium",
		233	"Roman",
		234	"Normal",
		235	"",
		236	},
		237	},
		238	{ "Regular/Italic Class",
		239	{ "Regular",
		240	"Book",
		241	"Medium",
		242	"Italic",
		243	"Oblique",
		244	"Roman",
		245	"Normal",
		246	"",
		247	},
		248	},
		249	{ "Bold/BoldItalic Class",
		250	{ "Bold",
		251	"Bold Italic",
		252	"Black",
		253	"",
		254	},
		255	},
		256	{ "Bold/Italic/BoldItalic Class",
		257	{ "Bold",
		258	"Bold Italic",
		259	"Black",
		260	"Italic",
		261	"Oblique",
		262	"",
		263	},
		264	},
		265	{ "Regular/Bold Class",
		266	{ "Regular",
		267	"Book",
		268	"Medium",
		269	"Normal",
		270	"Roman",
		271	"Bold",
		272	"Black",
		273	"",
		274	},
		275	},
		276	};
		277
		278
		279	/* Force special legacy fixes for fonts. */
		280	#define COMPATIBILITY_MODE_RULES_SIZE 1
		281
		282	const SPH_TweakRule COMPATIBILITY_MODE_Rules
		283	[COMPATIBILITY_MODE_RULES_SIZE] =
		284	{
		285	{ "-", 0, "", 0 },
		286	};
		287
		288
		289	/* Don't do subpixel (ignore_x_mode) hinting; do normal hinting. */
		290	#define PIXEL_HINTING_RULES_SIZE 2
		291
		292	const SPH_TweakRule PIXEL_HINTING_Rules
		293	[PIXEL_HINTING_RULES_SIZE] =
		294	{
		295	/* these characters are almost always safe */
		296	{ "Courier New", 12, "Italic", 'z' },
		297	{ "Courier New", 11, "Italic", 'z' },
		298	};
		299
		300
		301	/* Subpixel hinting ignores SHPIX rules on X. Force SHPIX for these. */
		302	#define DO_SHPIX_RULES_SIZE 1
		303
		304	const SPH_TweakRule DO_SHPIX_Rules
		305	[DO_SHPIX_RULES_SIZE] =
		306	{
		307	{ "-", 0, "", 0 },
		308	};
		309
		310
		311	/* Skip Y moves that start with a point that is not on a Y pixel */
		312	/* boundary and don't move that point to a Y pixel boundary. */
		313	#define SKIP_NONPIXEL_Y_MOVES_RULES_SIZE 4
		314
		315	const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules
		316	[SKIP_NONPIXEL_Y_MOVES_RULES_SIZE] =
		317	{
		318	/* fix vwxyz thinness*/
		319	{ "Consolas", 0, "", 0 },
		320	/* Fix thin middle stems */
		321	{ "Core MS Legacy Fonts", 0, "Regular", 0 },
		322	/* Cyrillic small letter I */
		323	{ "Legacy Sans Fonts", 0, "", 0 },
		324	/* Fix artifacts with some Regular & Bold */
		325	{ "Verdana Clones", 0, "", 0 },
		326	};
		327
		328
		329	#define SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
		330
		331	const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_Rules_Exceptions
		332	[SKIP_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
		333	{
		334	/* Fixes < and > */
		335	{ "Courier New", 0, "Regular", 0 },
		336	};
		337
		338
		339	/* Skip Y moves that start with a point that is not on a Y pixel */
		340	/* boundary and don't move that point to a Y pixel boundary. */
		341	#define SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE 2
		342
		343	const SPH_TweakRule SKIP_NONPIXEL_Y_MOVES_DELTAP_Rules
		344	[SKIP_NONPIXEL_Y_MOVES_DELTAP_RULES_SIZE] =
		345	{
		346	/* Maintain thickness of diagonal in 'N' */
		347	{ "Times New Roman", 0, "Regular/Bold Class", 'N' },
		348	{ "Georgia", 0, "Regular/Bold Class", 'N' },
		349	};
		350
		351
		352	/* Skip Y moves that move a point off a Y pixel boundary. */
		353	#define SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE 1
		354
		355	const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules
		356	[SKIP_OFFPIXEL_Y_MOVES_RULES_SIZE] =
		357	{
		358	{ "-", 0, "", 0 },
		359	};
		360
		361
		362	#define SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
		363
		364	const SPH_TweakRule SKIP_OFFPIXEL_Y_MOVES_Rules_Exceptions
		365	[SKIP_OFFPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
		366	{
		367	{ "-", 0, "", 0 },
		368	};
		369
		370
		371	/* Round moves that don't move a point to a Y pixel boundary. */
		372	#define ROUND_NONPIXEL_Y_MOVES_RULES_SIZE 2
		373
		374	const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules
		375	[ROUND_NONPIXEL_Y_MOVES_RULES_SIZE] =
		376	{
		377	/* Droid font instructions don't snap Y to pixels */
		378	{ "Droid Sans", 0, "Regular/Italic Class", 0 },
		379	{ "Droid Sans Mono", 0, "", 0 },
		380	};
		381
		382
		383	#define ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE 1
		384
		385	const SPH_TweakRule ROUND_NONPIXEL_Y_MOVES_Rules_Exceptions
		386	[ROUND_NONPIXEL_Y_MOVES_RULES_EXCEPTIONS_SIZE] =
		387	{
		388	{ "-", 0, "", 0 },
		389	};
		390
		391
		392	/* Allow a Direct_Move along X freedom vector if matched. */
		393	#define ALLOW_X_DMOVE_RULES_SIZE 1
		394
		395	const SPH_TweakRule ALLOW_X_DMOVE_Rules
		396	[ALLOW_X_DMOVE_RULES_SIZE] =
		397	{
		398	/* Fixes vanishing diagonal in 4 */
		399	{ "Verdana", 0, "Regular", '4' },
		400	};
		401
		402
		403	/* Return MS rasterizer version 35 if matched. */
		404	#define RASTERIZER_35_RULES_SIZE 8
		405
		406	const SPH_TweakRule RASTERIZER_35_Rules
		407	[RASTERIZER_35_RULES_SIZE] =
		408	{
		409	/* This seems to be the only way to make these look good */
		410	{ "Times New Roman", 0, "Regular", 'i' },
		411	{ "Times New Roman", 0, "Regular", 'j' },
		412	{ "Times New Roman", 0, "Regular", 'm' },
		413	{ "Times New Roman", 0, "Regular", 'r' },
		414	{ "Times New Roman", 0, "Regular", 'a' },
		415	{ "Times New Roman", 0, "Regular", 'n' },
		416	{ "Times New Roman", 0, "Regular", 'p' },
		417	{ "Times", 0, "", 0 },
		418	};
		419
		420
		421	/* Don't round to the subpixel grid. Round to pixel grid. */
		422	#define NORMAL_ROUND_RULES_SIZE 1
		423
		424	const SPH_TweakRule NORMAL_ROUND_Rules
		425	[NORMAL_ROUND_RULES_SIZE] =
		426	{
		427	/* Fix serif thickness for certain ppems */
		428	/* Can probably be generalized somehow */
		429	{ "Courier New", 0, "", 0 },
		430	};
		431
		432
		433	/* Skip IUP instructions if matched. */
		434	#define SKIP_IUP_RULES_SIZE 1
		435
		436	const SPH_TweakRule SKIP_IUP_Rules
		437	[SKIP_IUP_RULES_SIZE] =
		438	{
		439	{ "Arial", 13, "Regular", 'a' },
		440	};
		441
		442
		443	/* Skip MIAP Twilight hack if matched. */
		444	#define MIAP_HACK_RULES_SIZE 1
		445
		446	const SPH_TweakRule MIAP_HACK_Rules
		447	[MIAP_HACK_RULES_SIZE] =
		448	{
		449	{ "Geneva", 12, "", 0 },
		450	};
		451
		452
		453	/* Skip DELTAP instructions if matched. */
		454	#define ALWAYS_SKIP_DELTAP_RULES_SIZE 23
		455
		456	const SPH_TweakRule ALWAYS_SKIP_DELTAP_Rules
		457	[ALWAYS_SKIP_DELTAP_RULES_SIZE] =
		458	{
		459	{ "Georgia", 0, "Regular", 'k' },
		460	/* fix various problems with e in different versions */
		461	{ "Trebuchet MS", 14, "Regular", 'e' },
		462	{ "Trebuchet MS", 13, "Regular", 'e' },
		463	{ "Trebuchet MS", 15, "Regular", 'e' },
		464	{ "Trebuchet MS", 0, "Italic", 'v' },
		465	{ "Trebuchet MS", 0, "Italic", 'w' },
		466	{ "Trebuchet MS", 0, "Regular", 'Y' },
		467	{ "Arial", 11, "Regular", 's' },
		468	/* prevent problems with '3' and others */
		469	{ "Verdana", 10, "Regular", 0 },
		470	{ "Verdana", 9, "Regular", 0 },
		471	/* Cyrillic small letter short I */
		472	{ "Legacy Sans Fonts", 0, "", 0x438 },
		473	{ "Legacy Sans Fonts", 0, "", 0x439 },
		474	{ "Arial", 10, "Regular", '6' },
		475	{ "Arial", 0, "Bold/BoldItalic Class", 'a' },
		476	/* Make horizontal stems consistent with the rest */
		477	{ "Arial", 24, "Bold", 'a' },
		478	{ "Arial", 25, "Bold", 'a' },
		479	{ "Arial", 24, "Bold", 's' },
		480	{ "Arial", 25, "Bold", 's' },
		481	{ "Arial", 34, "Bold", 's' },
		482	{ "Arial", 35, "Bold", 's' },
		483	{ "Arial", 36, "Bold", 's' },
		484	{ "Arial", 25, "Regular", 's' },
		485	{ "Arial", 26, "Regular", 's' },
		486	};
		487
		488
		489	/* Always do DELTAP instructions if matched. */
		490	#define ALWAYS_DO_DELTAP_RULES_SIZE 1
		491
		492	const SPH_TweakRule ALWAYS_DO_DELTAP_Rules
		493	[ALWAYS_DO_DELTAP_RULES_SIZE] =
		494	{
		495	{ "-", 0, "", 0 },
		496	};
		497
		498
		499	/* Don't allow ALIGNRP after IUP. */
		500	#define NO_ALIGNRP_AFTER_IUP_RULES_SIZE 1
		501
		502	static const SPH_TweakRule NO_ALIGNRP_AFTER_IUP_Rules
		503	[NO_ALIGNRP_AFTER_IUP_RULES_SIZE] =
		504	{
		505	/* Prevent creation of dents in outline */
		506	{ "-", 0, "", 0 },
		507	};
		508
		509
		510	/* Don't allow DELTAP after IUP. */
		511	#define NO_DELTAP_AFTER_IUP_RULES_SIZE 1
		512
		513	static const SPH_TweakRule NO_DELTAP_AFTER_IUP_Rules
		514	[NO_DELTAP_AFTER_IUP_RULES_SIZE] =
		515	{
		516	{ "-", 0, "", 0 },
		517	};
		518
		519
		520	/* Don't allow CALL after IUP. */
		521	#define NO_CALL_AFTER_IUP_RULES_SIZE 1
		522
		523	static const SPH_TweakRule NO_CALL_AFTER_IUP_Rules
		524	[NO_CALL_AFTER_IUP_RULES_SIZE] =
		525	{
		526	/* Prevent creation of dents in outline */
		527	{ "-", 0, "", 0 },
		528	};
		529
		530
		531	/* De-embolden these glyphs slightly. */
		532	#define DEEMBOLDEN_RULES_SIZE 9
		533
		534	static const SPH_TweakRule DEEMBOLDEN_Rules
		535	[DEEMBOLDEN_RULES_SIZE] =
		536	{
		537	{ "Courier New", 0, "Bold", 'A' },
		538	{ "Courier New", 0, "Bold", 'W' },
		539	{ "Courier New", 0, "Bold", 'w' },
		540	{ "Courier New", 0, "Bold", 'M' },
		541	{ "Courier New", 0, "Bold", 'X' },
		542	{ "Courier New", 0, "Bold", 'K' },
		543	{ "Courier New", 0, "Bold", 'x' },
		544	{ "Courier New", 0, "Bold", 'z' },
		545	{ "Courier New", 0, "Bold", 'v' },
		546	};
		547
		548
		549	/* Embolden these glyphs slightly. */
		550	#define EMBOLDEN_RULES_SIZE 2
		551
		552	static const SPH_TweakRule EMBOLDEN_Rules
		553	[EMBOLDEN_RULES_SIZE] =
		554	{
		555	{ "Courier New", 0, "Regular", 0 },
		556	{ "Courier New", 0, "Italic", 0 },
		557	};
		558
		559
		560	/* This is a CVT hack that makes thick horizontal stems on 2, 5, 7 */
		561	/* similar to Windows XP. */
		562	#define TIMES_NEW_ROMAN_HACK_RULES_SIZE 12
		563
		564	static const SPH_TweakRule TIMES_NEW_ROMAN_HACK_Rules
		565	[TIMES_NEW_ROMAN_HACK_RULES_SIZE] =
		566	{
		567	{ "Times New Roman", 16, "Italic", '2' },
		568	{ "Times New Roman", 16, "Italic", '5' },
		569	{ "Times New Roman", 16, "Italic", '7' },
		570	{ "Times New Roman", 16, "Regular", '2' },
		571	{ "Times New Roman", 16, "Regular", '5' },
		572	{ "Times New Roman", 16, "Regular", '7' },
		573	{ "Times New Roman", 17, "Italic", '2' },
		574	{ "Times New Roman", 17, "Italic", '5' },
		575	{ "Times New Roman", 17, "Italic", '7' },
		576	{ "Times New Roman", 17, "Regular", '2' },
		577	{ "Times New Roman", 17, "Regular", '5' },
		578	{ "Times New Roman", 17, "Regular", '7' },
		579	};
		580
		581
		582	/* This fudges distance on 2 to get rid of the vanishing stem issue. */
		583	/* A real solution to this is certainly welcome. */
		584	#define COURIER_NEW_2_HACK_RULES_SIZE 15
		585
		586	static const SPH_TweakRule COURIER_NEW_2_HACK_Rules
		587	[COURIER_NEW_2_HACK_RULES_SIZE] =
		588	{
		589	{ "Courier New", 10, "Regular", '2' },
		590	{ "Courier New", 11, "Regular", '2' },
		591	{ "Courier New", 12, "Regular", '2' },
		592	{ "Courier New", 13, "Regular", '2' },
		593	{ "Courier New", 14, "Regular", '2' },
		594	{ "Courier New", 15, "Regular", '2' },
		595	{ "Courier New", 16, "Regular", '2' },
		596	{ "Courier New", 17, "Regular", '2' },
		597	{ "Courier New", 18, "Regular", '2' },
		598	{ "Courier New", 19, "Regular", '2' },
		599	{ "Courier New", 20, "Regular", '2' },
		600	{ "Courier New", 21, "Regular", '2' },
		601	{ "Courier New", 22, "Regular", '2' },
		602	{ "Courier New", 23, "Regular", '2' },
		603	{ "Courier New", 24, "Regular", '2' },
		604	};
		605
		606
		607	#ifndef FORCE_NATURAL_WIDTHS
		608
		609	/* Use compatible widths with these glyphs. Compatible widths is always */
		610	/* on when doing B/W TrueType instructing, but is used selectively here, */
		611	/* typically on glyphs with 3 or more vertical stems. */
		612	#define COMPATIBLE_WIDTHS_RULES_SIZE 38
		613
		614	static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules
		615	[COMPATIBLE_WIDTHS_RULES_SIZE] =
		616	{
		617	{ "Arial Unicode MS", 12, "Regular Class", 'm' },
		618	{ "Arial Unicode MS", 14, "Regular Class", 'm' },
		619	/* Cyrillic small letter sha */
		620	{ "Arial", 10, "Regular Class", 0x448 },
		621	{ "Arial", 11, "Regular Class", 'm' },
		622	{ "Arial", 12, "Regular Class", 'm' },
		623	/* Cyrillic small letter sha */
		624	{ "Arial", 12, "Regular Class", 0x448 },
		625	{ "Arial", 13, "Regular Class", 0x448 },
		626	{ "Arial", 14, "Regular Class", 'm' },
		627	/* Cyrillic small letter sha */
		628	{ "Arial", 14, "Regular Class", 0x448 },
		629	{ "Arial", 15, "Regular Class", 0x448 },
		630	{ "Arial", 17, "Regular Class", 'm' },
		631	{ "DejaVu Sans", 15, "Regular Class", 0 },
		632	{ "Microsoft Sans Serif", 11, "Regular Class", 0 },
		633	{ "Microsoft Sans Serif", 12, "Regular Class", 0 },
		634	{ "Segoe UI", 11, "Regular Class", 0 },
		635	{ "Monaco", 0, "Regular Class", 0 },
		636	{ "Segoe UI", 12, "Regular Class", 'm' },
		637	{ "Segoe UI", 14, "Regular Class", 'm' },
		638	{ "Tahoma", 11, "Regular Class", 0 },
		639	{ "Times New Roman", 16, "Regular Class", 'c' },
		640	{ "Times New Roman", 16, "Regular Class", 'm' },
		641	{ "Times New Roman", 16, "Regular Class", 'o' },
		642	{ "Times New Roman", 16, "Regular Class", 'w' },
		643	{ "Trebuchet MS", 11, "Regular Class", 0 },
		644	{ "Trebuchet MS", 12, "Regular Class", 0 },
		645	{ "Trebuchet MS", 14, "Regular Class", 0 },
		646	{ "Trebuchet MS", 15, "Regular Class", 0 },
		647	{ "Ubuntu", 12, "Regular Class", 'm' },
		648	/* Cyrillic small letter sha */
		649	{ "Verdana", 10, "Regular Class", 0x448 },
		650	{ "Verdana", 11, "Regular Class", 0x448 },
		651	{ "Verdana and Clones", 12, "Regular Class", 'i' },
		652	{ "Verdana and Clones", 12, "Regular Class", 'j' },
		653	{ "Verdana and Clones", 12, "Regular Class", 'l' },
		654	{ "Verdana and Clones", 12, "Regular Class", 'm' },
		655	{ "Verdana and Clones", 13, "Regular Class", 'i' },
		656	{ "Verdana and Clones", 13, "Regular Class", 'j' },
		657	{ "Verdana and Clones", 13, "Regular Class", 'l' },
		658	{ "Verdana and Clones", 14, "Regular Class", 'm' },
		659	};
		660
		661
		662	/* Scaling slightly in the x-direction prior to hinting results in */
		663	/* more visually pleasing glyphs in certain cases. */
		664	/* This sometimes needs to be coordinated with compatible width rules. */
		665	/* A value of 1000 corresponds to a scaled value of 1.0. */
		666
		667	#define X_SCALING_RULES_SIZE 50
		668
		669	static const SPH_ScaleRule X_SCALING_Rules[X_SCALING_RULES_SIZE] =
		670	{
		671	{ "DejaVu Sans", 12, "Regular Class", 'm', 950 },
		672	{ "Verdana and Clones", 12, "Regular Class", 'a', 1100 },
		673	{ "Verdana and Clones", 13, "Regular Class", 'a', 1050 },
		674	{ "Arial", 11, "Regular Class", 'm', 975 },
		675	{ "Arial", 12, "Regular Class", 'm', 1050 },
		676	/* Cyrillic small letter el */
		677	{ "Arial", 13, "Regular Class", 0x43B, 950 },
		678	{ "Arial", 13, "Regular Class", 'o', 950 },
		679	{ "Arial", 13, "Regular Class", 'e', 950 },
		680	{ "Arial", 14, "Regular Class", 'm', 950 },
		681	/* Cyrillic small letter el */
		682	{ "Arial", 15, "Regular Class", 0x43B, 925 },
		683	{ "Bitstream Vera Sans", 10, "Regular/Italic Class", 0, 1100 },
		684	{ "Bitstream Vera Sans", 12, "Regular/Italic Class", 0, 1050 },
		685	{ "Bitstream Vera Sans", 16, "Regular Class", 0, 1050 },
		686	{ "Bitstream Vera Sans", 9, "Regular/Italic Class", 0, 1050 },
		687	{ "DejaVu Sans", 12, "Regular Class", 'l', 975 },
		688	{ "DejaVu Sans", 12, "Regular Class", 'i', 975 },
		689	{ "DejaVu Sans", 12, "Regular Class", 'j', 975 },
		690	{ "DejaVu Sans", 13, "Regular Class", 'l', 950 },
		691	{ "DejaVu Sans", 13, "Regular Class", 'i', 950 },
		692	{ "DejaVu Sans", 13, "Regular Class", 'j', 950 },
		693	{ "DejaVu Sans", 10, "Regular/Italic Class", 0, 1100 },
		694	{ "DejaVu Sans", 12, "Regular/Italic Class", 0, 1050 },
		695	{ "Georgia", 10, "", 0, 1050 },
		696	{ "Georgia", 11, "", 0, 1100 },
		697	{ "Georgia", 12, "", 0, 1025 },
		698	{ "Georgia", 13, "", 0, 1050 },
		699	{ "Georgia", 16, "", 0, 1050 },
		700	{ "Georgia", 17, "", 0, 1030 },
		701	{ "Liberation Sans", 12, "Regular Class", 'm', 1100 },
		702	{ "Lucida Grande", 11, "Regular Class", 'm', 1100 },
		703	{ "Microsoft Sans Serif", 11, "Regular Class", 'm', 950 },
		704	{ "Microsoft Sans Serif", 12, "Regular Class", 'm', 1050 },
		705	{ "Segoe UI", 12, "Regular Class", 'H', 1050 },
		706	{ "Segoe UI", 12, "Regular Class", 'm', 1050 },
		707	{ "Segoe UI", 14, "Regular Class", 'm', 1050 },
		708	{ "Tahoma", 11, "Regular Class", 'i', 975 },
		709	{ "Tahoma", 11, "Regular Class", 'l', 975 },
		710	{ "Tahoma", 11, "Regular Class", 'j', 900 },
		711	{ "Tahoma", 11, "Regular Class", 'm', 918 },
		712	{ "Verdana", 10, "Regular/Italic Class", 0, 1100 },
		713	{ "Verdana", 12, "Regular Class", 'm', 975 },
		714	{ "Verdana", 12, "Regular/Italic Class", 0, 1050 },
		715	{ "Verdana", 13, "Regular/Italic Class", 'i', 950 },
		716	{ "Verdana", 13, "Regular/Italic Class", 'j', 950 },
		717	{ "Verdana", 13, "Regular/Italic Class", 'l', 950 },
		718	{ "Verdana", 16, "Regular Class", 0, 1050 },
		719	{ "Verdana", 9, "Regular/Italic Class", 0, 1050 },
		720	{ "Times New Roman", 16, "Regular Class", 'm', 918 },
		721	{ "Trebuchet MS", 11, "Regular Class", 'm', 800 },
		722	{ "Trebuchet MS", 12, "Regular Class", 'm', 800 },
		723	};
		724
		725	#else
		726
		727	#define COMPATIBLE_WIDTHS_RULES_SIZE 1
		728
		729	static const SPH_TweakRule COMPATIBLE_WIDTHS_Rules
		730	[COMPATIBLE_WIDTHS_RULES_SIZE] =
		731	{
		732	{ "-", 0, "", 0 },
		733	};
		734
		735
		736	#define X_SCALING_RULES_SIZE 1
		737
		738	static const SPH_ScaleRule X_SCALING_Rules
		739	[X_SCALING_RULES_SIZE] =
		740	{
		741	{ "-", 0, "", 0, 1000 },
		742	};
		743
		744	#endif /* FORCE_NATURAL_WIDTHS */
		745
		746
		747	FT_LOCAL_DEF( FT_Bool )
		748	is_member_of_family_class( const FT_String* detected_font_name,
		749	const FT_String* rule_font_name )
		750	{
		751	FT_UInt i, j;
		752
		753
		754	/* Does font name match rule family? */
		755	if ( strcmp( detected_font_name, rule_font_name ) == 0 )
		756	return TRUE;
		757
		758	/* Is font name a wildcard ""? */
		759	if ( strcmp( rule_font_name, "" ) == 0 )
		760	return TRUE;
		761
		762	/* Is font name contained in a class list? */
		763	for ( i = 0; i < FAMILY_CLASS_RULES_SIZE; i++ )
		764	{
		765	if ( strcmp( FAMILY_CLASS_Rules[i].name, rule_font_name ) == 0 )
		766	{
		767	for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
		768	{
		769	if ( strcmp( FAMILY_CLASS_Rules[i].member[j], "" ) == 0 )
		770	continue;
		771	if ( strcmp( FAMILY_CLASS_Rules[i].member[j],
		772	detected_font_name ) == 0 )
		773	return TRUE;
		774	}
		775	}
		776	}
		777
		778	return FALSE;
		779	}
		780
		781
		782	FT_LOCAL_DEF( FT_Bool )
		783	is_member_of_style_class( const FT_String* detected_font_style,
		784	const FT_String* rule_font_style )
		785	{
		786	FT_UInt i, j;
		787
		788
		789	/* Does font style match rule style? */
		790	if ( strcmp( detected_font_style, rule_font_style ) == 0 )
		791	return TRUE;
		792
		793	/* Is font style a wildcard ""? */
		794	if ( strcmp( rule_font_style, "" ) == 0 )
		795	return TRUE;
		796
		797	/* Is font style contained in a class list? */
		798	for ( i = 0; i < STYLE_CLASS_RULES_SIZE; i++ )
		799	{
		800	if ( strcmp( STYLE_CLASS_Rules[i].name, rule_font_style ) == 0 )
		801	{
		802	for ( j = 0; j < SPH_MAX_CLASS_MEMBERS; j++ )
		803	{
		804	if ( strcmp( STYLE_CLASS_Rules[i].member[j], "" ) == 0 )
		805	continue;
		806	if ( strcmp( STYLE_CLASS_Rules[i].member[j],
		807	detected_font_style ) == 0 )
		808	return TRUE;
		809	}
		810	}
		811	}
		812
		813	return FALSE;
		814	}
		815
		816
		817	FT_LOCAL_DEF( FT_Bool )
		818	sph_test_tweak( TT_Face face,
		819	const FT_String* family,
		820	FT_UInt ppem,
		821	const FT_String* style,
		822	FT_UInt glyph_index,
		823	const SPH_TweakRule* rule,
		824	FT_UInt num_rules )
		825	{
		826	FT_UInt i;
		827
		828
		829	/* rule checks may be able to be optimized further */
		830	for ( i = 0; i < num_rules; i++ )
		831	{
		832	if ( family &&
		833	( is_member_of_family_class ( family, rule[i].family ) ) )
		834	if ( rule[i].ppem == 0 \|\|
		835	rule[i].ppem == ppem )
		836	if ( style &&
		837	is_member_of_style_class ( style, rule[i].style ) )
		838	if ( rule[i].glyph == 0 \|\|
		839	FT_Get_Char_Index( (FT_Face)face,
		840	rule[i].glyph ) == glyph_index )
		841	return TRUE;
		842	}
		843
		844	return FALSE;
		845	}
		846
		847
		848	static FT_UInt
		849	scale_test_tweak( TT_Face face,
		850	const FT_String* family,
		851	FT_UInt ppem,
		852	const FT_String* style,
		853	FT_UInt glyph_index,
		854	const SPH_ScaleRule* rule,
		855	FT_UInt num_rules )
		856	{
		857	FT_UInt i;
		858
		859
		860	/* rule checks may be able to be optimized further */
		861	for ( i = 0; i < num_rules; i++ )
		862	{
		863	if ( family &&
		864	( is_member_of_family_class ( family, rule[i].family ) ) )
		865	if ( rule[i].ppem == 0 \|\|
		866	rule[i].ppem == ppem )
		867	if ( style &&
		868	is_member_of_style_class( style, rule[i].style ) )
		869	if ( rule[i].glyph == 0 \|\|
		870	FT_Get_Char_Index( (FT_Face)face,
		871	rule[i].glyph ) == glyph_index )
		872	return rule[i].scale;
		873	}
		874
		875	return 1000;
		876	}
		877
		878
		879	FT_LOCAL_DEF( FT_UInt )
		880	sph_test_tweak_x_scaling( TT_Face face,
		881	const FT_String* family,
		882	FT_UInt ppem,
		883	const FT_String* style,
		884	FT_UInt glyph_index )
		885	{
		886	return scale_test_tweak( face, family, ppem, style, glyph_index,
		887	X_SCALING_Rules, X_SCALING_RULES_SIZE );
		888	}
		889
		890
		891	#define TWEAK_RULES( x ) \
		892	if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
		893	x##_Rules, x##_RULES_SIZE ) ) \
		894	loader->exec->sph_tweak_flags \|= SPH_TWEAK_##x;
		895
		896	#define TWEAK_RULES_EXCEPTIONS( x ) \
		897	if ( sph_test_tweak( face, family, ppem, style, glyph_index, \
		898	x##_Rules_Exceptions, x##_RULES_EXCEPTIONS_SIZE ) ) \
		899	loader->exec->sph_tweak_flags &= ~SPH_TWEAK_##x;
		900
		901
		902	FT_LOCAL_DEF( void )
		903	sph_set_tweaks( TT_Loader loader,
		904	FT_UInt glyph_index )
		905	{
		906	TT_Face face = (TT_Face)loader->face;
		907	FT_String* family = face->root.family_name;
		908	int ppem = loader->size->metrics.x_ppem;
		909	FT_String* style = face->root.style_name;
		910
		911
		912	/* don't apply rules if style isn't set */
		913	if ( !face->root.style_name )
		914	return;
		915
		916	#ifdef SPH_DEBUG_MORE_VERBOSE
		917	printf( "%s,%d,%s,%c=%d ",
		918	family, ppem, style, glyph_index, glyph_index );
		919	#endif
		920
		921	TWEAK_RULES( PIXEL_HINTING );
		922
		923	if ( loader->exec->sph_tweak_flags & SPH_TWEAK_PIXEL_HINTING )
		924	{
		925	loader->exec->ignore_x_mode = FALSE;
		926	return;
		927	}
		928
		929	TWEAK_RULES( ALLOW_X_DMOVE );
		930	TWEAK_RULES( ALWAYS_DO_DELTAP );
		931	TWEAK_RULES( ALWAYS_SKIP_DELTAP );
		932	TWEAK_RULES( DEEMBOLDEN );
		933	TWEAK_RULES( DO_SHPIX );
		934	TWEAK_RULES( EMBOLDEN );
		935	TWEAK_RULES( MIAP_HACK );
		936	TWEAK_RULES( NORMAL_ROUND );
		937	TWEAK_RULES( NO_ALIGNRP_AFTER_IUP );
		938	TWEAK_RULES( NO_CALL_AFTER_IUP );
		939	TWEAK_RULES( NO_DELTAP_AFTER_IUP );
		940	TWEAK_RULES( RASTERIZER_35 );
		941	TWEAK_RULES( SKIP_IUP );
		942
		943	TWEAK_RULES( SKIP_OFFPIXEL_Y_MOVES );
		944	TWEAK_RULES_EXCEPTIONS( SKIP_OFFPIXEL_Y_MOVES );
		945
		946	TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES_DELTAP );
		947
		948	TWEAK_RULES( SKIP_NONPIXEL_Y_MOVES );
		949	TWEAK_RULES_EXCEPTIONS( SKIP_NONPIXEL_Y_MOVES );
		950
		951	TWEAK_RULES( ROUND_NONPIXEL_Y_MOVES );
		952	TWEAK_RULES_EXCEPTIONS( ROUND_NONPIXEL_Y_MOVES );
		953
		954	if ( loader->exec->sph_tweak_flags & SPH_TWEAK_RASTERIZER_35 )
		955	{
		956	if ( loader->exec->rasterizer_version != TT_INTERPRETER_VERSION_35 )
		957	{
		958	loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
		959	loader->exec->size->cvt_ready = FALSE;
		960
		961	tt_size_ready_bytecode(
		962	loader->exec->size,
		963	FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
		964	}
		965	else
		966	loader->exec->rasterizer_version = TT_INTERPRETER_VERSION_35;
		967	}
		968	else
		969	{
		970	if ( loader->exec->rasterizer_version !=
		971	SPH_OPTION_SET_RASTERIZER_VERSION )
		972	{
		973	loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
		974	loader->exec->size->cvt_ready = FALSE;
		975
		976	tt_size_ready_bytecode(
		977	loader->exec->size,
		978	FT_BOOL( loader->load_flags & FT_LOAD_PEDANTIC ) );
		979	}
		980	else
		981	loader->exec->rasterizer_version = SPH_OPTION_SET_RASTERIZER_VERSION;
		982	}
		983
		984	if ( IS_HINTED( loader->load_flags ) )
		985	{
		986	TWEAK_RULES( TIMES_NEW_ROMAN_HACK );
		987	TWEAK_RULES( COURIER_NEW_2_HACK );
		988	}
		989
		990	if ( sph_test_tweak( face, family, ppem, style, glyph_index,
		991	COMPATIBILITY_MODE_Rules, COMPATIBILITY_MODE_RULES_SIZE ) )
		992	loader->exec->face->sph_compatibility_mode = TRUE;
		993
		994
		995	if ( IS_HINTED( loader->load_flags ) )
		996	{
		997	if ( sph_test_tweak( face, family, ppem, style, glyph_index,
		998	COMPATIBLE_WIDTHS_Rules, COMPATIBLE_WIDTHS_RULES_SIZE ) )
		999	loader->exec->compatible_widths \|= TRUE;
		1000	}
		1001	}
		1002
		1003	#else /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
		1004
		1005	/* ANSI C doesn't like empty source files */
		1006	typedef int _tt_subpix_dummy;
		1007
		1008	#endif /* !TT_CONFIG_OPTION_SUBPIXEL_HINTING */
		1009
		1010
		1011	/* END */

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(root)/contrib/sdk/sources/freetype/src/truetype/ttsubpix.c – Rev 8031