/*
 *    Text analyzer
 *
 * Copyright 2011 Aric Stewart for CodeWeavers
 * Copyright 2012, 2014 Nikolay Sivov for CodeWeavers
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */

#define COBJMACROS

#include <math.h>

#include "dwrite_private.h"
#include "scripts.h"

WINE_DEFAULT_DEBUG_CHANNEL(dwrite);

extern const unsigned short wine_linebreak_table[];
extern const unsigned short wine_scripts_table[];

struct dwritescript_properties {
    DWRITE_SCRIPT_PROPERTIES props;
    UINT32 scripttag;    /* OpenType script tag */
    UINT32 scriptalttag; /* Version 2 tag, 0 is not defined */
    BOOL is_complex;
    const struct scriptshaping_ops *ops;
};

#define _OT(a,b,c,d) DWRITE_MAKE_OPENTYPE_TAG(a,b,c,d)

/* NOTE: keep this array synced with script ids from scripts.h */
static const struct dwritescript_properties dwritescripts_properties[Script_LastId+1] = {
    { /* Zzzz */ { 0x7a7a7a5a, 999, 15, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Zyyy */ { 0x7979795a, 998,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 } },
    { /* Ahom */ { 0x6d6f6841, 338,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Hluw */ { 0x77756c48,  80,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Arab */ { 0x62617241, 160,  8, 0x0640, 0, 1, 0, 0, 0, 1, 1 }, _OT('a','r','a','b'), 0, TRUE },
    { /* Armn */ { 0x6e6d7241, 230,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('a','r','m','n') },
    { /* Avst */ { 0x74737641, 134,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('a','v','s','t') },
    { /* Bali */ { 0x696c6142, 360, 15, 0x0020, 1, 0, 1, 0, 0, 0, 0 }, _OT('b','a','l','i') },
    { /* Bamu */ { 0x756d6142, 435,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('b','a','m','u') },
    { /* Bass */ { 0x73736142, 259,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Batk */ { 0x6b746142, 365,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('b','a','t','k') },
    { /* Beng */ { 0x676e6542, 325, 15, 0x0020, 1, 1, 0, 0, 0, 1, 0 }, _OT('b','e','n','g'), _OT('b','n','g','2'), TRUE },
    { /* Bopo */ { 0x6f706f42, 285,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('b','o','p','o') },
    { /* Brah */ { 0x68617242, 300,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('b','r','a','h') },
    { /* Brai */ { 0x69617242, 570,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('b','r','a','i'), 0, TRUE },
    { /* Bugi */ { 0x69677542, 367,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('b','u','g','i') },
    { /* Buhd */ { 0x64687542, 372,  8, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('b','u','h','d') },
    { /* Cans */ { 0x736e6143, 440,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('c','a','n','s'), 0, TRUE },
    { /* Cari */ { 0x69726143, 201,  1, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('c','a','r','i') },
    { /* Aghb */ { 0x62686741, 239,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Cakm */ { 0x6d6b6143, 349,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('c','a','k','m') },
    { /* Cham */ { 0x6d616843, 358,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('c','h','a','m') },
    { /* Cher */ { 0x72656843, 445,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('c','h','e','r'), 0, TRUE },
    { /* Copt */ { 0x74706f43, 204,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('c','o','p','t') },
    { /* Xsux */ { 0x78757358,  20,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('x','s','u','x') },
    { /* Cprt */ { 0x74727043, 403,  1, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('c','p','r','t') },
    { /* Cyrl */ { 0x6c727943, 220,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('c','y','r','l') },
    { /* Dsrt */ { 0x74727344, 250,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('d','s','r','t'), 0, TRUE },
    { /* Deva */ { 0x61766544, 315, 15, 0x0020, 1, 1, 0, 0, 0, 1, 0 }, _OT('d','e','v','a'), _OT('d','e','v','2'), TRUE },
    { /* Dupl */ { 0x6c707544, 755,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Egyp */ { 0x70796745,  50,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('e','g','y','p') },
    { /* Elba */ { 0x61626c45, 226,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Ethi */ { 0x69687445, 430,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('e','t','h','i'), 0, TRUE },
    { /* Geor */ { 0x726f6547, 240,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('g','e','o','r') },
    { /* Glag */ { 0x67616c47, 225,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('g','l','a','g') },
    { /* Goth */ { 0x68746f47, 206,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('g','o','t','h') },
    { /* Gran */ { 0x6e617247, 343,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Grek */ { 0x6b657247, 200,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('g','r','e','k') },
    { /* Gujr */ { 0x726a7547, 320, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('g','u','j','r'), _OT('g','j','r','2'), TRUE },
    { /* Guru */ { 0x75727547, 310, 15, 0x0020, 1, 1, 0, 0, 0, 1, 0 }, _OT('g','u','r','u'), _OT('g','u','r','2'), TRUE },
    { /* Hani */ { 0x696e6148, 500,  8, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('h','a','n','i') },
    { /* Hang */ { 0x676e6148, 286,  8, 0x0020, 1, 1, 1, 1, 0, 0, 0 }, _OT('h','a','n','g'), 0, TRUE },
    { /* Hano */ { 0x6f6e6148, 371,  8, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('h','a','n','o') },
    { /* Hatr */ { 0x72746148, 127,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Hebr */ { 0x72626548, 125,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('h','e','b','r'), 0, TRUE },
    { /* Hira */ { 0x61726948, 410,  8, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('k','a','n','a') },
    { /* Armi */ { 0x696d7241, 124,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('a','r','m','i') },
    { /* Phli */ { 0x696c6850, 131,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('p','h','l','i') },
    { /* Prti */ { 0x69747250, 130,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('p','r','t','i') },
    { /* Java */ { 0x6176614a, 361, 15, 0x0020, 1, 0, 1, 0, 0, 0, 0 }, _OT('j','a','v','a') },
    { /* Kthi */ { 0x6968744b, 317, 15, 0x0020, 1, 1, 0, 0, 0, 1, 0 }, _OT('k','t','h','i') },
    { /* Knda */ { 0x61646e4b, 345, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('k','n','d','a'), _OT('k','n','d','2'), TRUE },
    { /* Kana */ { 0x616e614b, 411,  8, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('k','a','n','a') },
    { /* Kali */ { 0x696c614b, 357,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('k','a','l','i') },
    { /* Khar */ { 0x7261684b, 305, 15, 0x0020, 1, 0, 1, 0, 0, 0, 0 }, _OT('k','h','a','r') },
    { /* Khmr */ { 0x726d684b, 355,  8, 0x0020, 1, 0, 1, 0, 1, 0, 0 }, _OT('k','h','m','r'), 0, TRUE },
    { /* Khoj */ { 0x6a6f684b, 322,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Sind */ { 0x646e6953, 318,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Laoo */ { 0x6f6f614c, 356,  8, 0x0020, 1, 0, 1, 0, 1, 0, 0 }, _OT('l','a','o',' '), 0, TRUE },
    { /* Latn */ { 0x6e74614c, 215,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('l','a','t','n'), 0, FALSE, &latn_shaping_ops },
    { /* Lepc */ { 0x6370654c, 335,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('l','e','p','c') },
    { /* Limb */ { 0x626d694c, 336,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('l','i','m','b') },
    { /* Lina */ { 0x616e694c, 400,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Linb */ { 0x626e694c, 401,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('l','i','n','b') },
    { /* Lisu */ { 0x7573694c, 399,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('l','i','s','u') },
    { /* Lyci */ { 0x6963794c, 202,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('l','y','c','i') },
    { /* Lydi */ { 0x6964794c, 116,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('l','y','d','i') },
    { /* Mahj */ { 0x6a68614d, 314,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Mlym */ { 0x6d796c4d, 347, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('m','l','y','m'), _OT('m','l','m','2'), TRUE },
    { /* Mand */ { 0x646e614d, 140,  8, 0x0640, 0, 1, 0, 0, 0, 1, 1 }, _OT('m','a','n','d') },
    { /* Mani */ { 0x696e614d, 139,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Mtei */ { 0x6965744d, 337,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('m','t','e','i') },
    { /* Mend */ { 0x646e654d, 438,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Merc */ { 0x6372654d, 101,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('m','e','r','c') },
    { /* Mero */ { 0x6f72654d, 100,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('m','e','r','o') },
    { /* Plrd */ { 0x64726c50, 282,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Modi */ { 0x69646f4d, 324,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Mong */ { 0x676e6f4d, 145,  8, 0x0020, 0, 1, 0, 0, 0, 1, 1 }, _OT('m','o','n','g'), 0, TRUE },
    { /* Mroo */ { 0x6f6f724d, 199,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Mult */ { 0x746c754d, 323,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Mymr */ { 0x726d794d, 350, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('m','y','m','r'), 0, TRUE },
    { /* Nbat */ { 0x7461624e, 159,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Talu */ { 0x756c6154, 354,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','a','l','u'), 0, TRUE },
    { /* Nkoo */ { 0x6f6f6b4e, 165,  8, 0x0020, 0, 1, 0, 0, 0, 1, 1 }, _OT('n','k','o',' '), 0, TRUE },
    { /* Ogam */ { 0x6d61674f, 212,  1, 0x1680, 0, 1, 0, 0, 0, 1, 0 }, _OT('o','g','a','m'), 0, TRUE },
    { /* Olck */ { 0x6b636c4f, 261,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('o','l','c','k') },
    { /* Hung */ { 0x676e7548, 176,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Ital */ { 0x6c617449, 210,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('i','t','a','l') },
    { /* Narb */ { 0x6272614e, 106,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Perm */ { 0x6d726550, 227,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Xpeo */ { 0x6f657058,  30,  1, 0x0020, 0, 1, 1, 1, 0, 0, 0 }, _OT('x','p','e','o'), 0, TRUE },
    { /* Sarb */ { 0x62726153, 105,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('s','a','r','b') },
    { /* Orkh */ { 0x686b724f, 175,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('o','r','k','h') },
    { /* Orya */ { 0x6179724f, 327, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('o','r','y','a'), _OT('o','r','y','2'), TRUE },
    { /* Osma */ { 0x616d734f, 260,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('o','s','m','a'), 0, TRUE },
    { /* Hmng */ { 0x676e6d48, 450,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Palm */ { 0x6d6c6150, 126,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Pauc */ { 0x63756150, 263,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Phag */ { 0x67616850, 331,  8, 0x0020, 0, 1, 0, 0, 0, 1, 1 }, _OT('p','h','a','g'), 0, TRUE },
    { /* Phnx */ { 0x786e6850, 115,  1, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('p','h','n','x') },
    { /* Phlp */ { 0x706c6850, 132,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Rjng */ { 0x676e6a52, 363,  8, 0x0020, 1, 0, 1, 0, 0, 0, 0 }, _OT('r','j','n','g') },
    { /* Runr */ { 0x726e7552, 211,  1, 0x0020, 0, 0, 1, 0, 0, 0, 0 }, _OT('r','u','n','r'), 0, TRUE },
    { /* Samr */ { 0x726d6153, 123,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('s','a','m','r') },
    { /* Saur */ { 0x72756153, 344,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('s','a','u','r') },
    { /* Shrd */ { 0x64726853, 319,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('s','h','r','d') },
    { /* Shaw */ { 0x77616853, 281,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('s','h','a','w') },
    { /* Sidd */ { 0x64646953, 302,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Sgnw */ { 0x776e6753,  95,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Sinh */ { 0x686e6953, 348,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('s','i','n','h'), 0, TRUE },
    { /* Sora */ { 0x61726f53, 398,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('s','o','r','a') },
    { /* Sund */ { 0x646e7553, 362,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('s','u','n','d') },
    { /* Sylo */ { 0x6f6c7953, 316,  8, 0x0020, 1, 1, 0, 0, 0, 1, 0 }, _OT('s','y','l','o') },
    { /* Syrc */ { 0x63727953, 135,  8, 0x0640, 0, 1, 0, 0, 0, 1, 1 }, _OT('s','y','r','c'), 0, TRUE },
    { /* Tglg */ { 0x676c6754, 370,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('t','g','l','g') },
    { /* Tagb */ { 0x62676154, 373,  8, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('t','a','g','b') },
    { /* Tale */ { 0x656c6154, 353,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('t','a','l','e'), 0, TRUE },
    { /* Lana */ { 0x616e614c, 351,  8, 0x0020, 1, 0, 1, 0, 0, 0, 0 }, _OT('l','a','n','a') },
    { /* Tavt */ { 0x74766154, 359,  8, 0x0020, 1, 0, 1, 0, 1, 0, 0 }, _OT('t','a','v','t') },
    { /* Takr */ { 0x726b6154, 321,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 }, _OT('t','a','k','r') },
    { /* Taml */ { 0x6c6d6154, 346, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','a','m','l'), _OT('t','m','l','2'), TRUE },
    { /* Telu */ { 0x756c6554, 340, 15, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','e','l','u'), _OT('t','e','l','2'), TRUE },
    { /* Thaa */ { 0x61616854, 170,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','h','a','a'), 0, TRUE },
    { /* Thai */ { 0x69616854, 352,  8, 0x0020, 1, 0, 1, 0, 1, 0, 0 }, _OT('t','h','a','i'), 0, TRUE },
    { /* Tibt */ { 0x74626954, 330,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','i','b','t'), 0, TRUE },
    { /* Tfng */ { 0x676e6654, 120,  8, 0x0020, 1, 1, 1, 0, 0, 0, 0 }, _OT('t','f','n','g'), 0, TRUE },
    { /* Tirh */ { 0x68726954, 326,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Ugar */ { 0x72616755,  40,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('u','g','a','r') },
    { /* Vaii */ { 0x69696156, 470,  1, 0x0020, 0, 1, 1, 0, 0, 0, 0 }, _OT('v','a','i',' '), 0, TRUE },
    { /* Wara */ { 0x61726157, 262,  1, 0x0020, 0, 0, 0, 0, 0, 0, 0 } },
    { /* Yiii */ { 0x69696959, 460,  1, 0x0020, 0, 0, 1, 1, 0, 0, 0 }, _OT('y','i',' ',' '), 0, TRUE }
};
#undef _OT

struct dwrite_numbersubstitution {
    IDWriteNumberSubstitution IDWriteNumberSubstitution_iface;
    LONG ref;

    DWRITE_NUMBER_SUBSTITUTION_METHOD method;
    WCHAR *locale;
    BOOL ignore_user_override;
};

static inline struct dwrite_numbersubstitution *impl_from_IDWriteNumberSubstitution(IDWriteNumberSubstitution *iface)
{
    return CONTAINING_RECORD(iface, struct dwrite_numbersubstitution, IDWriteNumberSubstitution_iface);
}

static inline UINT32 decode_surrogate_pair(const WCHAR *str, UINT32 index, UINT32 end)
{
    if (index < end-1 && IS_SURROGATE_PAIR(str[index], str[index+1])) {
        UINT32 ch = 0x10000 + ((str[index] - 0xd800) << 10) + (str[index+1] - 0xdc00);
        TRACE("surrogate pair (%x %x) => %x\n", str[index], str[index+1], ch);
        return ch;
    }
    return 0;
}

static inline UINT16 get_char_script(WCHAR c)
{
    UINT16 script = get_table_entry(wine_scripts_table, c);
    if (script == Script_Unknown) {
        WORD type;
        if (GetStringTypeW(CT_CTYPE1, &c, 1, &type) && (type & C1_CNTRL))
            script = Script_Common;
    }
    return script;
}

static HRESULT analyze_script(const WCHAR *text, UINT32 position, UINT32 len, IDWriteTextAnalysisSink *sink)
{
    DWRITE_SCRIPT_ANALYSIS sa;
    UINT32 pos, i, length;

    if (!len) return S_OK;

    sa.script = get_char_script(*text);

    pos = position;
    length = 1;

    for (i = 1; i < len; i++)
    {
        UINT16 script = get_char_script(text[i]);

        /* Unknown type is ignored when preceded or followed by another script */
        if (sa.script == Script_Unknown) sa.script = script;
        if (script == Script_Unknown && sa.script != Script_Common) script = sa.script;
        /* this is a length of a sequence to be reported next */
        if (sa.script == script) length++;

        if (sa.script != script)
        {
            HRESULT hr;

            sa.shapes = sa.script != Script_Common ? DWRITE_SCRIPT_SHAPES_DEFAULT : DWRITE_SCRIPT_SHAPES_NO_VISUAL;
            hr = IDWriteTextAnalysisSink_SetScriptAnalysis(sink, pos, length, &sa);
            if (FAILED(hr)) return hr;
            pos = position + i;
            length = 1;
            sa.script = script;
        }
    }

    /* 1 length case or normal completion call */
    sa.shapes = sa.script != Script_Common ? DWRITE_SCRIPT_SHAPES_DEFAULT : DWRITE_SCRIPT_SHAPES_NO_VISUAL;
    return IDWriteTextAnalysisSink_SetScriptAnalysis(sink, pos, length, &sa);
}

struct linebreaking_state {
    DWRITE_LINE_BREAKPOINT *breakpoints;
    UINT32 count;
};

enum BreakConditionLocation {
    BreakConditionBefore,
    BreakConditionAfter
};

enum linebreaking_classes {
    b_BK = 1,
    b_CR,
    b_LF,
    b_CM,
    b_SG,
    b_GL,
    b_CB,
    b_SP,
    b_ZW,
    b_NL,
    b_WJ,
    b_JL,
    b_JV,
    b_JT,
    b_H2,
    b_H3,
    b_XX,
    b_OP,
    b_CL,
    b_CP,
    b_QU,
    b_NS,
    b_EX,
    b_SY,
    b_IS,
    b_PR,
    b_PO,
    b_NU,
    b_AL,
    b_ID,
    b_IN,
    b_HY,
    b_BB,
    b_BA,
    b_SA,
    b_AI,
    b_B2,
    b_HL,
    b_CJ,
    b_RI
};

/* "Can break" is a weak condition, stronger "may not break" and "must break" override it. Initially all conditions are
    set to "can break" and could only be changed once. */
static inline void set_break_condition(UINT32 pos, enum BreakConditionLocation location, DWRITE_BREAK_CONDITION condition,
    struct linebreaking_state *state)
{
    if (location == BreakConditionBefore) {
        if (state->breakpoints[pos].breakConditionBefore != DWRITE_BREAK_CONDITION_CAN_BREAK)
            return;
        state->breakpoints[pos].breakConditionBefore = condition;
        if (pos > 0)
            state->breakpoints[pos-1].breakConditionAfter = condition;
    }
    else {
        if (state->breakpoints[pos].breakConditionAfter != DWRITE_BREAK_CONDITION_CAN_BREAK)
            return;
        state->breakpoints[pos].breakConditionAfter = condition;
        if (pos + 1 < state->count)
            state->breakpoints[pos+1].breakConditionBefore = condition;
    }
}

static HRESULT analyze_linebreaks(const WCHAR *text, UINT32 count, DWRITE_LINE_BREAKPOINT *breakpoints)
{
    struct linebreaking_state state;
    short *break_class;
    int i, j;

    break_class = heap_alloc(count*sizeof(short));
    if (!break_class)
        return E_OUTOFMEMORY;

    state.breakpoints = breakpoints;
    state.count = count;

    /* LB31 - allow breaks everywhere. It will be overridden if needed as
       other rules dictate. */
    for (i = 0; i < count; i++)
    {
        break_class[i] = get_table_entry(wine_linebreak_table, text[i]);

        breakpoints[i].breakConditionBefore = DWRITE_BREAK_CONDITION_CAN_BREAK;
        breakpoints[i].breakConditionAfter  = DWRITE_BREAK_CONDITION_CAN_BREAK;
        breakpoints[i].isWhitespace = break_class[i] == b_BK || break_class[i] == b_ZW || break_class[i] == b_SP || isspaceW(text[i]);
        breakpoints[i].isSoftHyphen = FALSE;
        breakpoints[i].padding = 0;

        /* LB1 - resolve some classes. TODO: use external algorithms for these classes. */
        switch (break_class[i])
        {
            case b_AI:
            case b_SA:
            case b_SG:
            case b_XX:
                break_class[i] = b_AL;
                break;
            case b_CJ:
                break_class[i] = b_NS;
                break;
        }
    }

    /* LB2 - never break at the start */
    set_break_condition(0, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
    /* LB3 - always break at the end. This one is ignored. */

    for (i = 0; i < count; i++)
    {
        switch (break_class[i])
        {
            /* LB4 - LB6 */
            case b_CR:
                /* LB5 - don't break CR x LF */
                if (i < count-1 && break_class[i+1] == b_LF)
                {
                    set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                    break;
                }
            case b_LF:
            case b_NL:
            case b_BK:
                /* LB4 - LB5 - always break after hard breaks */
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MUST_BREAK, &state);
                /* LB6 - do not break before hard breaks */
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB7 - do not break before spaces */
            case b_SP:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            case b_ZW:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            /* LB8 - break before character after zero-width space, skip spaces in-between */
                while (i < count-1 && break_class[i+1] == b_SP)
                    i++;
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
                break;
        }
    }

    /* LB9 - LB10 */
    for (i = 0; i < count; i++)
    {
        if (break_class[i] == b_CM)
        {
            if (i > 0)
            {
                switch (break_class[i-1])
                {
                    case b_SP:
                    case b_BK:
                    case b_CR:
                    case b_LF:
                    case b_NL:
                    case b_ZW:
                        break_class[i] = b_AL;
                        break;
                    default:
                        break_class[i] = break_class[i-1];
                }
            }
            else break_class[i] = b_AL;
        }
    }

    for (i = 0; i < count; i++)
    {
        switch (break_class[i])
        {
            /* LB11 - don't break before and after word joiner */
            case b_WJ:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB12 - don't break after glue */
            case b_GL:
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            /* LB12a */
                if (i > 0)
                {
                    if (break_class[i-1] != b_SP && break_class[i-1] != b_BA && break_class[i-1] != b_HY)
                        set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                }
                break;
            /* LB13 */
            case b_CL:
            case b_CP:
            case b_EX:
            case b_IS:
            case b_SY:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB14 */
            case b_OP:
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                while (i < count-1 && break_class[i+1] == b_SP) {
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                    i++;
                }
                break;
            /* LB15 */
            case b_QU:
                j = i+1;
                while (j < count-1 && break_class[j] == b_SP)
                    j++;
                if (break_class[j] == b_OP)
                    for (; j > i; j--)
                        set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB16 */
            case b_NS:
                j = i-1;
                while(j > 0 && break_class[j] == b_SP)
                    j--;
                if (break_class[j] == b_CL || break_class[j] == b_CP)
                    for (j++; j <= i; j++)
                        set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB17 */
            case b_B2:
                j = i+1;
                while (j < count && break_class[j] == b_SP)
                    j++;
                if (break_class[j] == b_B2)
                    for (; j > i; j--)
                        set_break_condition(j, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
        }
    }

    for (i = 0; i < count; i++)
    {
        switch(break_class[i])
        {
            /* LB18 - break is allowed after space */
            case b_SP:
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
                break;
            /* LB19 - don't break before or after quotation mark */
            case b_QU:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB20 */
            case b_CB:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_CAN_BREAK, &state);
                break;
            /* LB21 */
            case b_BA:
            case b_HY:
            case b_NS:
                set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            case b_BB:
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                break;
            /* LB21a */
            case b_HL:
                if (i < count-2)
                    switch (break_class[i+1])
                    {
                    case b_HY:
                    case b_BA:
                        set_break_condition(i+1, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                    }
                break;
            /* LB22 */
            case b_IN:
                if (i > 0)
                {
                    switch (break_class[i-1])
                    {
                        case b_AL:
                        case b_HL:
                        case b_ID:
                        case b_IN:
                        case b_NU:
                            set_break_condition(i, BreakConditionBefore, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                    }
                }
                break;
        }

        if (i < count-1)
        {
            /* LB23 */
            if ((break_class[i] == b_ID && break_class[i+1] == b_PO) ||
                (break_class[i] == b_AL && break_class[i+1] == b_NU) ||
                (break_class[i] == b_HL && break_class[i+1] == b_NU) ||
                (break_class[i] == b_NU && break_class[i+1] == b_AL) ||
                (break_class[i] == b_NU && break_class[i+1] == b_HL))
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            /* LB24 */
            if ((break_class[i] == b_PR && break_class[i+1] == b_ID) ||
                (break_class[i] == b_PR && break_class[i+1] == b_AL) ||
                (break_class[i] == b_PR && break_class[i+1] == b_HL) ||
                (break_class[i] == b_PO && break_class[i+1] == b_AL) ||
                (break_class[i] == b_PO && break_class[i+1] == b_HL))
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB25 */
            if ((break_class[i] == b_CL && break_class[i+1] == b_PO) ||
                (break_class[i] == b_CP && break_class[i+1] == b_PO) ||
                (break_class[i] == b_CL && break_class[i+1] == b_PR) ||
                (break_class[i] == b_CP && break_class[i+1] == b_PR) ||
                (break_class[i] == b_NU && break_class[i+1] == b_PO) ||
                (break_class[i] == b_NU && break_class[i+1] == b_PR) ||
                (break_class[i] == b_PO && break_class[i+1] == b_OP) ||
                (break_class[i] == b_PO && break_class[i+1] == b_NU) ||
                (break_class[i] == b_PR && break_class[i+1] == b_OP) ||
                (break_class[i] == b_PR && break_class[i+1] == b_NU) ||
                (break_class[i] == b_HY && break_class[i+1] == b_NU) ||
                (break_class[i] == b_IS && break_class[i+1] == b_NU) ||
                (break_class[i] == b_NU && break_class[i+1] == b_NU) ||
                (break_class[i] == b_SY && break_class[i+1] == b_NU))
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB26 */
            if (break_class[i] == b_JL)
            {
                switch (break_class[i+1])
                {
                    case b_JL:
                    case b_JV:
                    case b_H2:
                    case b_H3:
                        set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                }
            }
            if ((break_class[i] == b_JV || break_class[i] == b_H2) &&
                (break_class[i+1] == b_JV || break_class[i+1] == b_JT))
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            if ((break_class[i] == b_JT || break_class[i] == b_H3) &&
                 break_class[i+1] == b_JT)
                    set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB27 */
            switch (break_class[i])
            {
                case b_JL:
                case b_JV:
                case b_JT:
                case b_H2:
                case b_H3:
                    if (break_class[i+1] == b_IN || break_class[i+1] == b_PO)
                        set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            }
            if (break_class[i] == b_PO)
            {
                switch (break_class[i+1])
                {
                    case b_JL:
                    case b_JV:
                    case b_JT:
                    case b_H2:
                    case b_H3:
                        set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
                }
            }

            /* LB28 */
            if ((break_class[i] == b_AL && break_class[i+1] == b_AL) ||
                (break_class[i] == b_AL && break_class[i+1] == b_HL) ||
                (break_class[i] == b_HL && break_class[i+1] == b_AL) ||
                (break_class[i] == b_HL && break_class[i+1] == b_HL))
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB29 */
            if ((break_class[i] == b_IS && break_class[i+1] == b_AL) ||
                (break_class[i] == b_IS && break_class[i+1] == b_HL))
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB30 */
            if ((break_class[i] == b_AL || break_class[i] == b_HL || break_class[i] == b_NU) &&
                 break_class[i+1] == b_OP)
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
            if (break_class[i] == b_CP &&
               (break_class[i+1] == b_AL || break_class[i] == b_HL || break_class[i] == b_NU))
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);

            /* LB30a */
            if (break_class[i] == b_RI && break_class[i+1] == b_RI)
                set_break_condition(i, BreakConditionAfter, DWRITE_BREAK_CONDITION_MAY_NOT_BREAK, &state);
        }
    }

    heap_free(break_class);
    return S_OK;
}

static HRESULT WINAPI dwritetextanalyzer_QueryInterface(IDWriteTextAnalyzer2 *iface, REFIID riid, void **obj)
{
    TRACE("(%s %p)\n", debugstr_guid(riid), obj);

    if (IsEqualIID(riid, &IID_IDWriteTextAnalyzer2) ||
        IsEqualIID(riid, &IID_IDWriteTextAnalyzer1) ||
        IsEqualIID(riid, &IID_IDWriteTextAnalyzer) ||
        IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        return S_OK;
    }

    *obj = NULL;
    return E_NOINTERFACE;
}

static ULONG WINAPI dwritetextanalyzer_AddRef(IDWriteTextAnalyzer2 *iface)
{
    return 2;
}

static ULONG WINAPI dwritetextanalyzer_Release(IDWriteTextAnalyzer2 *iface)
{
    return 1;
}

/* This helper tries to get 'length' chars from a source, allocating a buffer only if source failed to provide enough
   data after a first request. */
static HRESULT get_text_source_ptr(IDWriteTextAnalysisSource *source, UINT32 position, UINT32 length, const WCHAR **text, WCHAR **buff)
{
    HRESULT hr;
    UINT32 len;

    *buff = NULL;
    *text = NULL;
    len = 0;
    hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, position, text, &len);
    if (FAILED(hr)) return hr;

    if (len < length) {
        UINT32 read;

        *buff = heap_alloc(length*sizeof(WCHAR));
        if (!*buff)
            return E_OUTOFMEMORY;
        memcpy(*buff, *text, len*sizeof(WCHAR));
        read = len;

        while (read < length && *text) {
            *text = NULL;
            len = 0;
            hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, read, text, &len);
            if (FAILED(hr)) {
                heap_free(*buff);
                return hr;
            }
            memcpy(*buff + read, *text, min(len, length-read)*sizeof(WCHAR));
            read += len;
        }

        *text = *buff;
    }

    return hr;
}

static HRESULT WINAPI dwritetextanalyzer_AnalyzeScript(IDWriteTextAnalyzer2 *iface,
    IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
{
    WCHAR *buff = NULL;
    const WCHAR *text;
    HRESULT hr;

    TRACE("(%p %u %u %p)\n", source, position, length, sink);

    if (length == 0)
        return S_OK;

    hr = get_text_source_ptr(source, position, length, &text, &buff);
    if (FAILED(hr))
        return hr;

    hr = analyze_script(text, position, length, sink);
    heap_free(buff);

    return hr;
}

static HRESULT WINAPI dwritetextanalyzer_AnalyzeBidi(IDWriteTextAnalyzer2 *iface,
    IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
{
    UINT8 *levels = NULL, *explicit = NULL;
    UINT8 baselevel, level, explicit_level;
    WCHAR *buff = NULL;
    const WCHAR *text;
    UINT32 pos, i;
    HRESULT hr;

    TRACE("(%p %u %u %p)\n", source, position, length, sink);

    if (length == 0)
        return S_OK;

    hr = get_text_source_ptr(source, position, length, &text, &buff);
    if (FAILED(hr))
        return hr;

    levels = heap_alloc(length*sizeof(*levels));
    explicit = heap_alloc(length*sizeof(*explicit));

    if (!levels || !explicit) {
        hr = E_OUTOFMEMORY;
        goto done;
    }

    baselevel = IDWriteTextAnalysisSource_GetParagraphReadingDirection(source);
    hr = bidi_computelevels(text, length, baselevel, explicit, levels);
    if (FAILED(hr))
        goto done;

    level = levels[0];
    explicit_level = explicit[0];
    pos = 0;
    for (i = 1; i < length; i++) {
        if (levels[i] != level || explicit[i] != explicit_level) {
            hr = IDWriteTextAnalysisSink_SetBidiLevel(sink, pos, i - pos, explicit_level, level);
            if (FAILED(hr))
                break;
            level = levels[i];
            explicit_level = explicit[i];
            pos = i;
        }

        if (i == length - 1)
            hr = IDWriteTextAnalysisSink_SetBidiLevel(sink, pos, length - pos, explicit_level, level);
    }

done:
    heap_free(explicit);
    heap_free(levels);
    heap_free(buff);

    return hr;
}

static HRESULT WINAPI dwritetextanalyzer_AnalyzeNumberSubstitution(IDWriteTextAnalyzer2 *iface,
    IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
{
    FIXME("(%p %u %u %p): stub\n", source, position, length, sink);
    return S_OK;
}

static HRESULT WINAPI dwritetextanalyzer_AnalyzeLineBreakpoints(IDWriteTextAnalyzer2 *iface,
    IDWriteTextAnalysisSource* source, UINT32 position, UINT32 length, IDWriteTextAnalysisSink* sink)
{
    DWRITE_LINE_BREAKPOINT *breakpoints = NULL;
    WCHAR *buff = NULL;
    const WCHAR *text;
    HRESULT hr;
    UINT32 len;

    TRACE("(%p %u %u %p)\n", source, position, length, sink);

    if (length == 0)
        return S_OK;

    /* get some, check for length */
    text = NULL;
    len = 0;
    hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, position, &text, &len);
    if (FAILED(hr)) return hr;

    if (len < length) {
        UINT32 read;

        buff = heap_alloc(length*sizeof(WCHAR));
        if (!buff)
            return E_OUTOFMEMORY;
        memcpy(buff, text, len*sizeof(WCHAR));
        read = len;

        while (read < length && text) {
            text = NULL;
            len = 0;
            hr = IDWriteTextAnalysisSource_GetTextAtPosition(source, read, &text, &len);
            if (FAILED(hr))
                goto done;
            memcpy(&buff[read], text, min(len, length-read)*sizeof(WCHAR));
            read += len;
        }

        text = buff;
    }

    breakpoints = heap_alloc(length*sizeof(*breakpoints));
    if (!breakpoints) {
        hr = E_OUTOFMEMORY;
        goto done;
    }

    hr = analyze_linebreaks(text, length, breakpoints);
    if (FAILED(hr))
        goto done;

    hr = IDWriteTextAnalysisSink_SetLineBreakpoints(sink, position, length, breakpoints);

done:
    heap_free(breakpoints);
    heap_free(buff);

    return hr;
}

static UINT32 get_opentype_language(const WCHAR *locale)
{
    UINT32 language = DWRITE_FONT_FEATURE_TAG_DEFAULT;

    if (locale) {
        WCHAR tag[5];
        if (GetLocaleInfoEx(locale, LOCALE_SOPENTYPELANGUAGETAG, tag, sizeof(tag)/sizeof(WCHAR)))
            language = DWRITE_MAKE_OPENTYPE_TAG(tag[0],tag[1],tag[2],tag[3]);
    }

    return language;
}

static HRESULT WINAPI dwritetextanalyzer_GetGlyphs(IDWriteTextAnalyzer2 *iface,
    WCHAR const* text, UINT32 length, IDWriteFontFace* fontface, BOOL is_sideways,
    BOOL is_rtl, DWRITE_SCRIPT_ANALYSIS const* analysis, WCHAR const* locale,
    IDWriteNumberSubstitution* substitution, DWRITE_TYPOGRAPHIC_FEATURES const** features,
    UINT32 const* feature_range_len, UINT32 feature_ranges, UINT32 max_glyph_count,
    UINT16* clustermap, DWRITE_SHAPING_TEXT_PROPERTIES* text_props, UINT16* glyph_indices,
    DWRITE_SHAPING_GLYPH_PROPERTIES* glyph_props, UINT32* actual_glyph_count)
{
    const struct dwritescript_properties *scriptprops;
    struct scriptshaping_context context;
    struct scriptshaping_cache *cache = NULL;
    BOOL update_cluster, need_vertical;
    IDWriteFontFace1 *fontface1;
    WCHAR *string;
    UINT32 i, g;
    HRESULT hr = S_OK;
    UINT16 script;

    TRACE("(%s:%u %p %d %d %p %s %p %p %p %u %u %p %p %p %p %p)\n", debugstr_wn(text, length),
        length, fontface, is_sideways, is_rtl, analysis, debugstr_w(locale), substitution, features, feature_range_len,
        feature_ranges, max_glyph_count, clustermap, text_props, glyph_indices, glyph_props, actual_glyph_count);

    script = analysis->script > Script_LastId ? Script_Unknown : analysis->script;

    if (max_glyph_count < length)
        return E_NOT_SUFFICIENT_BUFFER;

    if (substitution)
        FIXME("number substitution is not supported.\n");

    for (i = 0; i < length; i++) {
        /* FIXME: set to better values */
        glyph_props[i].justification = text[i] == ' ' ? SCRIPT_JUSTIFY_BLANK : SCRIPT_JUSTIFY_CHARACTER;
        glyph_props[i].isClusterStart = 1;
        glyph_props[i].isDiacritic = 0;
        glyph_props[i].isZeroWidthSpace = 0;
        glyph_props[i].reserved = 0;

        /* FIXME: have the shaping engine set this */
        text_props[i].isShapedAlone = 0;
        text_props[i].reserved = 0;

        clustermap[i] = i;
    }

    for (; i < max_glyph_count; i++) {
        glyph_props[i].justification = SCRIPT_JUSTIFY_NONE;
        glyph_props[i].isClusterStart = 0;
        glyph_props[i].isDiacritic = 0;
        glyph_props[i].isZeroWidthSpace = 0;
        glyph_props[i].reserved = 0;
    }

    string = heap_alloc(sizeof(WCHAR)*length);
    if (!string)
        return E_OUTOFMEMORY;

    hr = IDWriteFontFace_QueryInterface(fontface, &IID_IDWriteFontFace1, (void**)&fontface1);
    if (FAILED(hr))
        WARN("failed to get IDWriteFontFace1\n");

    need_vertical = is_sideways && fontface1 && IDWriteFontFace1_HasVerticalGlyphVariants(fontface1);

    for (i = 0, g = 0, update_cluster = FALSE; i < length; i++) {
        UINT32 codepoint;

        if (!update_cluster) {
            codepoint = decode_surrogate_pair(text, i, length);
            if (!codepoint) {
                codepoint = is_rtl ? bidi_get_mirrored_char(text[i]) : text[i];
                string[i] = codepoint;
            }
            else {
                string[i] = text[i];
                string[i+1] = text[i+1];
                update_cluster = TRUE;
            }

            hr = IDWriteFontFace_GetGlyphIndices(fontface, &codepoint, 1, &glyph_indices[g]);
            if (FAILED(hr))
                goto done;

            if (need_vertical) {
                UINT16 vertical;

                hr = IDWriteFontFace1_GetVerticalGlyphVariants(fontface1, 1, &glyph_indices[g], &vertical);
                if (hr == S_OK)
                    glyph_indices[g] = vertical;
            }

            g++;
        }
        else {
            INT32 k;

            update_cluster = FALSE;
            /* mark surrogate halves with same cluster */
            clustermap[i] = clustermap[i-1];
            /* update following clusters */
            for (k = i + 1; k >= 0 && k < length; k++)
                clustermap[k]--;
        }
    }
    *actual_glyph_count = g;

    hr = create_scriptshaping_cache(fontface, &cache);
    if (FAILED(hr))
        goto done;

    context.cache = cache;
    context.text = text;
    context.length = length;
    context.is_rtl = is_rtl;
    context.max_glyph_count = max_glyph_count;
    context.language_tag = get_opentype_language(locale);

    scriptprops = &dwritescripts_properties[script];
    if (scriptprops->ops && scriptprops->ops->contextual_shaping) {
        hr = scriptprops->ops->contextual_shaping(&context, clustermap, glyph_indices, actual_glyph_count);
        if (FAILED(hr))
            goto done;
    }

    /* FIXME: apply default features */

    if (scriptprops->ops && scriptprops->ops->set_text_glyphs_props)
        hr = scriptprops->ops->set_text_glyphs_props(&context, clustermap, glyph_indices, *actual_glyph_count, text_props, glyph_props);
    else
        hr = default_shaping_ops.set_text_glyphs_props(&context, clustermap, glyph_indices, *actual_glyph_count, text_props, glyph_props);

done:
    if (fontface1)
        IDWriteFontFace1_Release(fontface1);
    release_scriptshaping_cache(cache);
    heap_free(string);

    return hr;
}

static HRESULT WINAPI dwritetextanalyzer_GetGlyphPlacements(IDWriteTextAnalyzer2 *iface,
    WCHAR const* text, UINT16 const* clustermap, DWRITE_SHAPING_TEXT_PROPERTIES* props,
    UINT32 text_len, UINT16 const* glyphs, DWRITE_SHAPING_GLYPH_PROPERTIES const* glyph_props,
    UINT32 glyph_count, IDWriteFontFace *fontface, FLOAT emSize, BOOL is_sideways, BOOL is_rtl,
    DWRITE_SCRIPT_ANALYSIS const* analysis, WCHAR const* locale, DWRITE_TYPOGRAPHIC_FEATURES const** features,
    UINT32 const* feature_range_len, UINT32 feature_ranges, FLOAT *advances, DWRITE_GLYPH_OFFSET *offsets)
{
    DWRITE_FONT_METRICS metrics;
    IDWriteFontFace1 *fontface1;
    HRESULT hr;
    UINT32 i;

    TRACE("(%s %p %p %u %p %p %u %p %.2f %d %d %p %s %p %p %u %p %p)\n", debugstr_wn(text, text_len),
        clustermap, props, text_len, glyphs, glyph_props, glyph_count, fontface, emSize, is_sideways,
        is_rtl, analysis, debugstr_w(locale), features, feature_range_len, feature_ranges, advances, offsets);

    if (glyph_count == 0)
        return S_OK;

    hr = IDWriteFontFace_QueryInterface(fontface, &IID_IDWriteFontFace1, (void**)&fontface1);
    if (FAILED(hr)) {
        WARN("failed to get IDWriteFontFace1.\n");
        return hr;
    }

    IDWriteFontFace_GetMetrics(fontface, &metrics);
    for (i = 0; i < glyph_count; i++) {
        INT32 a;

        hr = IDWriteFontFace1_GetDesignGlyphAdvances(fontface1, 1, &glyphs[i], &a, is_sideways);
        if (FAILED(hr))
            a = 0;

        advances[i] = get_scaled_advance_width(a, emSize, &metrics);
        offsets[i].advanceOffset = 0.0;
        offsets[i].ascenderOffset = 0.0;
    }

    /* FIXME: actually apply features */

    IDWriteFontFace1_Release(fontface1);
    return S_OK;
}

static HRESULT WINAPI dwritetextanalyzer_GetGdiCompatibleGlyphPlacements(IDWriteTextAnalyzer2 *iface,
    WCHAR const* text, UINT16 const* clustermap, DWRITE_SHAPING_TEXT_PROPERTIES* props,
    UINT32 text_len, UINT16 const* glyphs, DWRITE_SHAPING_GLYPH_PROPERTIES const* glyph_props,
    UINT32 glyph_count, IDWriteFontFace *fontface, FLOAT emSize, FLOAT ppdip,
    DWRITE_MATRIX const* transform, BOOL use_gdi_natural, BOOL is_sideways, BOOL is_rtl,
    DWRITE_SCRIPT_ANALYSIS const* analysis, WCHAR const* locale, DWRITE_TYPOGRAPHIC_FEATURES const** features,
    UINT32 const* feature_range_lengths, UINT32 feature_ranges, FLOAT *advances, DWRITE_GLYPH_OFFSET *offsets)
{
    DWRITE_FONT_METRICS metrics;
    IDWriteFontFace1 *fontface1;
    HRESULT hr;
    UINT32 i;

    TRACE("(%s %p %p %u %p %p %u %p %.2f %.2f %p %d %d %d %p %s %p %p %u %p %p)\n", debugstr_wn(text, text_len),
        clustermap, props, text_len, glyphs, glyph_props, glyph_count, fontface, emSize, ppdip,
        transform, use_gdi_natural, is_sideways, is_rtl, analysis, debugstr_w(locale), features, feature_range_lengths,
        feature_ranges, advances, offsets);

    if (glyph_count == 0)
        return S_OK;

    hr = IDWriteFontFace_QueryInterface(fontface, &IID_IDWriteFontFace1, (void**)&fontface1);
    if (FAILED(hr)) {
        WARN("failed to get IDWriteFontFace1.\n");
        return hr;
    }

    hr = IDWriteFontFace_GetGdiCompatibleMetrics(fontface, emSize, ppdip, transform, &metrics);
    if (FAILED(hr)) {
        IDWriteFontFace1_Release(fontface1);
        WARN("failed to get compat metrics, 0x%08x\n", hr);
        return hr;
    }
    for (i = 0; i < glyph_count; i++) {
        INT32 a;

        hr = IDWriteFontFace1_GetGdiCompatibleGlyphAdvances(fontface1, emSize, ppdip,
            transform, use_gdi_natural, is_sideways, 1, &glyphs[i], &a);
        if (FAILED(hr))
            advances[i] = 0.0;
        else
            advances[i] = floorf(a * emSize * ppdip / metrics.designUnitsPerEm + 0.5f) / ppdip;
        offsets[i].advanceOffset = 0.0;
        offsets[i].ascenderOffset = 0.0;
    }

    /* FIXME: actually apply features */

    IDWriteFontFace1_Release(fontface1);
    return S_OK;
}

static inline FLOAT get_cluster_advance(const FLOAT *advances, UINT32 start, UINT32 end)
{
    FLOAT advance = 0.0;
    for (; start < end; start++)
        advance += advances[start];
    return advance;
}

static void apply_single_glyph_spacing(FLOAT leading_spacing, FLOAT trailing_spacing,
    FLOAT min_advance_width, UINT32 g, FLOAT const *advances, DWRITE_GLYPH_OFFSET const *offsets,
    DWRITE_SHAPING_GLYPH_PROPERTIES const *props, FLOAT *modified_advances, DWRITE_GLYPH_OFFSET *modified_offsets)
{
    BOOL reduced = leading_spacing < 0.0 || trailing_spacing < 0.0;
    FLOAT advance = advances[g];
    FLOAT origin = 0.0;

    if (props[g].isZeroWidthSpace) {
        modified_advances[g] = advances[g];
        modified_offsets[g] = offsets[g];
        return;
    }

    /* first apply negative spacing and check if we hit minimum width */
    if (leading_spacing < 0.0) {
        advance += leading_spacing;
        origin -= leading_spacing;
    }
    if (trailing_spacing < 0.0)
        advance += trailing_spacing;

    if (advance < min_advance_width) {
        FLOAT half = (min_advance_width - advance) / 2.0;

        if (!reduced)
            origin -= half;
        else if (leading_spacing < 0.0 && trailing_spacing < 0.0)
            origin -= half;
        else if (leading_spacing < 0.0)
            origin -= min_advance_width - advance;

        advance = min_advance_width;
    }

    /* now apply positive spacing adjustments */
    if (leading_spacing > 0.0) {
        advance += leading_spacing;
        origin -= leading_spacing;
    }
    if (trailing_spacing > 0.0)
        advance += trailing_spacing;

    modified_advances[g] = advance;
    modified_offsets[g].advanceOffset = offsets[g].advanceOffset - origin;
    /* ascender is never touched, it's orthogonal to reading direction and is not
       affected by advance adjustments */
    modified_offsets[g].ascenderOffset = offsets[g].ascenderOffset;
}

static void apply_cluster_spacing(FLOAT leading_spacing, FLOAT trailing_spacing, FLOAT min_advance_width,
    UINT32 start, UINT32 end, FLOAT const *advances, DWRITE_GLYPH_OFFSET const *offsets,
    FLOAT *modified_advances, DWRITE_GLYPH_OFFSET *modified_offsets)
{
    BOOL reduced = leading_spacing < 0.0 || trailing_spacing < 0.0;
    FLOAT advance = get_cluster_advance(advances, start, end);
    FLOAT origin = 0.0;
    UINT16 g;

    modified_advances[start] = advances[start];
    modified_advances[end-1] = advances[end-1];

    /* first apply negative spacing and check if we hit minimum width */
    if (leading_spacing < 0.0) {
        advance += leading_spacing;
        modified_advances[start] += leading_spacing;
        origin -= leading_spacing;
    }
    if (trailing_spacing < 0.0) {
        advance += trailing_spacing;
        modified_advances[end-1] += trailing_spacing;
    }
    if (advance < min_advance_width) {
        /* additional spacing is only applied to leading and trailing glyph */
        FLOAT half = (min_advance_width - advance) / 2.0;

        if (!reduced) {
            origin -= half;
            modified_advances[start] += half;
            modified_advances[end-1] += half;
        }
        else if (leading_spacing < 0.0 && trailing_spacing < 0.0) {
            origin -= half;
            modified_advances[start] += half;
            modified_advances[end-1] += half;
        }
        else if (leading_spacing < 0.0) {
            origin -= min_advance_width - advance;
            modified_advances[start] += min_advance_width - advance;
        }
        else
            modified_advances[end-1] += min_advance_width - advance;

        advance = min_advance_width;
    }

    /* now apply positive spacing adjustments */
    if (leading_spacing > 0.0) {
        modified_advances[start] += leading_spacing;
        origin -= leading_spacing;
    }
    if (trailing_spacing > 0.0)
        modified_advances[end-1] += trailing_spacing;

    for (g = start; g < end; g++) {
        if (g == start) {
            modified_offsets[g].advanceOffset = offsets[g].advanceOffset - origin;
            modified_offsets[g].ascenderOffset = offsets[g].ascenderOffset;
        }
        else if (g == end - 1)
            /* trailing glyph offset is not adjusted */
            modified_offsets[g] = offsets[g];
        else {
            /* for all glyphs within a cluster use original advances and offsets */
            modified_advances[g] = advances[g];
            modified_offsets[g] = offsets[g];
        }
    }
}

static inline UINT32 get_cluster_length(UINT16 const *clustermap, UINT32 start, UINT32 text_len)
{
    UINT16 g = clustermap[start];
    UINT32 length = 1;

    while (start < text_len && clustermap[++start] == g)
        length++;
    return length;
}

/* Applies spacing adjustments to clusters.

   Adjustments are applied in the following order:

   1. Negative adjustments

      Leading and trailing spacing could be negative, at this step
      only negative ones are actually applied. Leading spacing is only
      applied to leading glyph, trailing - to trailing glyph.

   2. Minimum advance width

      Advances could only be reduced at this point or unchanged. In any
      case it's checked if cluster advance width is less than minimum width.
      If it's the case advance width is incremented up to minimum value.

      Important part is the direction in which this increment is applied;
      it depends on from which directions total cluster advance was trimmed
      at step 1. So it could be incremented from leading, trailing, or both
      sides. When applied to both sides, each side gets half of difference
      that bring advance to minimum width.

   3. Positive adjustments

      After minimum width rule was applied, positive spacing is applied in same
      way as negative ones on step 1.

   Glyph offset for leading glyph is adjusted too in a way that glyph origin
   keeps its position in coordinate system where initial advance width is counted
   from 0.

   Glyph properties

   It's known that isZeroWidthSpace property keeps initial advance from changing.

   TODO: test other properties; make isZeroWidthSpace work properly for clusters
         with more than one glyph.

*/
static HRESULT WINAPI dwritetextanalyzer1_ApplyCharacterSpacing(IDWriteTextAnalyzer2 *iface,
    FLOAT leading_spacing, FLOAT trailing_spacing, FLOAT min_advance_width, UINT32 len,
    UINT32 glyph_count, UINT16 const *clustermap, FLOAT const *advances, DWRITE_GLYPH_OFFSET const *offsets,
    DWRITE_SHAPING_GLYPH_PROPERTIES const *props, FLOAT *modified_advances, DWRITE_GLYPH_OFFSET *modified_offsets)
{
    UINT16 start;

    TRACE("(%.2f %.2f %.2f %u %u %p %p %p %p %p %p)\n", leading_spacing, trailing_spacing, min_advance_width,
        len, glyph_count, clustermap, advances, offsets, props, modified_advances, modified_offsets);

    if (min_advance_width < 0.0) {
        memset(modified_advances, 0, glyph_count*sizeof(*modified_advances));
        return E_INVALIDARG;
    }

    /* minimum advance is not applied if no adjustments were made */
    if (leading_spacing == 0.0 && trailing_spacing == 0.0) {
        memmove(modified_advances, advances, glyph_count*sizeof(*advances));
        memmove(modified_offsets, offsets, glyph_count*sizeof(*offsets));
        return S_OK;
    }

    start = 0;
    for (start = 0; start < len;) {
        UINT32 length = get_cluster_length(clustermap, start, len);

        if (length == 1) {
            UINT32 g = clustermap[start];

            apply_single_glyph_spacing(leading_spacing, trailing_spacing, min_advance_width,
                g, advances, offsets, props, modified_advances, modified_offsets);
        }
        else {
            UINT32 g_start, g_end;

            g_start = clustermap[start];
            g_end = (start + length < len) ? clustermap[start + length] : glyph_count;

            apply_cluster_spacing(leading_spacing, trailing_spacing, min_advance_width,
                g_start, g_end, advances, offsets, modified_advances, modified_offsets);
        }

        start += length;
    }

    return S_OK;
}

static HRESULT WINAPI dwritetextanalyzer1_GetBaseline(IDWriteTextAnalyzer2 *iface, IDWriteFontFace *face,
    DWRITE_BASELINE baseline, BOOL vertical, BOOL is_simulation_allowed, DWRITE_SCRIPT_ANALYSIS sa,
    const WCHAR *localeName, INT32 *baseline_coord, BOOL *exists)
{
    FIXME("(%p %d %d %u %s %p %p): stub\n", face, vertical, is_simulation_allowed, sa.script, debugstr_w(localeName),
        baseline_coord, exists);
    return E_NOTIMPL;
}

static HRESULT WINAPI dwritetextanalyzer1_AnalyzeVerticalGlyphOrientation(IDWriteTextAnalyzer2 *iface,
    IDWriteTextAnalysisSource1* source, UINT32 text_pos, UINT32 len, IDWriteTextAnalysisSink1 *sink)
{
    FIXME("(%p %u %u %p): stub\n", source, text_pos, len, sink);
    return E_NOTIMPL;
}

static HRESULT WINAPI dwritetextanalyzer1_GetGlyphOrientationTransform(IDWriteTextAnalyzer2 *iface,
    DWRITE_GLYPH_ORIENTATION_ANGLE angle, BOOL is_sideways, DWRITE_MATRIX *transform)
{
    TRACE("(%d %d %p)\n", angle, is_sideways, transform);
    return IDWriteTextAnalyzer2_GetGlyphOrientationTransform(iface, angle, is_sideways, 0.0, 0.0, transform);
}

static HRESULT WINAPI dwritetextanalyzer1_GetScriptProperties(IDWriteTextAnalyzer2 *iface, DWRITE_SCRIPT_ANALYSIS sa,
    DWRITE_SCRIPT_PROPERTIES *props)
{
    TRACE("(%u %p)\n", sa.script, props);

    if (sa.script > Script_LastId)
        return E_INVALIDARG;

    *props = dwritescripts_properties[sa.script].props;
    return S_OK;
}

static inline BOOL is_char_from_simple_script(WCHAR c)
{
    if (IS_HIGH_SURROGATE(c) || IS_LOW_SURROGATE(c))
        return FALSE;
    else {
        UINT16 script = get_char_script(c);
        return !dwritescripts_properties[script].is_complex;
    }
}

static HRESULT WINAPI dwritetextanalyzer1_GetTextComplexity(IDWriteTextAnalyzer2 *iface, const WCHAR *text,
    UINT32 len, IDWriteFontFace *face, BOOL *is_simple, UINT32 *len_read, UINT16 *indices)
{
    HRESULT hr = S_OK;
    int i;

    TRACE("(%s:%u %p %p %p %p)\n", debugstr_wn(text, len), len, face, is_simple, len_read, indices);

    *is_simple = FALSE;
    *len_read = 0;

    if (!face)
        return E_INVALIDARG;

    if (len == 0) {
        *is_simple = TRUE;
        return S_OK;
    }

    *is_simple = text[0] && is_char_from_simple_script(text[0]);
    for (i = 1; i < len && text[i]; i++) {
        if (is_char_from_simple_script(text[i])) {
            if (!*is_simple)
                break;
        }
        else
            *is_simple = FALSE;
    }

    *len_read = i;

    /* fetch indices */
    if (*is_simple && indices) {
        UINT32 *codepoints = heap_alloc(*len_read*sizeof(UINT32));
        if (!codepoints)
            return E_OUTOFMEMORY;

        for (i = 0; i < *len_read; i++)
            codepoints[i] = text[i];

        hr = IDWriteFontFace_GetGlyphIndices(face, codepoints, *len_read, indices);
        heap_free(codepoints);
    }

    return hr;
}

static HRESULT WINAPI dwritetextanalyzer1_GetJustificationOpportunities(IDWriteTextAnalyzer2 *iface,
    IDWriteFontFace *face, FLOAT font_em_size, DWRITE_SCRIPT_ANALYSIS sa, UINT32 length, UINT32 glyph_count,
    const WCHAR *text, const UINT16 *clustermap, const DWRITE_SHAPING_GLYPH_PROPERTIES *prop, DWRITE_JUSTIFICATION_OPPORTUNITY *jo)
{
    FIXME("(%p %.2f %u %u %u %s %p %p %p): stub\n", face, font_em_size, sa.script, length, glyph_count,
        debugstr_wn(text, length), clustermap, prop, jo);
    return E_NOTIMPL;
}

static HRESULT WINAPI dwritetextanalyzer1_JustifyGlyphAdvances(IDWriteTextAnalyzer2 *iface,
    FLOAT width, UINT32 glyph_count, const DWRITE_JUSTIFICATION_OPPORTUNITY *jo, const FLOAT *advances,
    const DWRITE_GLYPH_OFFSET *offsets, FLOAT *justifiedadvances, DWRITE_GLYPH_OFFSET *justifiedoffsets)
{
    FIXME("(%.2f %u %p %p %p %p %p): stub\n", width, glyph_count, jo, advances, offsets, justifiedadvances,
        justifiedoffsets);
    return E_NOTIMPL;
}

static HRESULT WINAPI dwritetextanalyzer1_GetJustifiedGlyphs(IDWriteTextAnalyzer2 *iface,
    IDWriteFontFace *face, FLOAT font_em_size, DWRITE_SCRIPT_ANALYSIS sa, UINT32 length,
    UINT32 glyph_count, UINT32 max_glyphcount, const UINT16 *clustermap, const UINT16 *indices,
    const FLOAT *advances, const FLOAT *justifiedadvances, const DWRITE_GLYPH_OFFSET *justifiedoffsets,
    const DWRITE_SHAPING_GLYPH_PROPERTIES *prop, UINT32 *actual_count, UINT16 *modified_clustermap,
    UINT16 *modified_indices, FLOAT *modified_advances, DWRITE_GLYPH_OFFSET *modified_offsets)
{
    FIXME("(%p %.2f %u %u %u %u %p %p %p %p %p %p %p %p %p %p %p): stub\n", face, font_em_size, sa.script,
        length, glyph_count, max_glyphcount, clustermap, indices, advances, justifiedadvances, justifiedoffsets,
        prop, actual_count, modified_clustermap, modified_indices, modified_advances, modified_offsets);
    return E_NOTIMPL;
}

static HRESULT WINAPI dwritetextanalyzer2_GetGlyphOrientationTransform(IDWriteTextAnalyzer2 *iface,
    DWRITE_GLYPH_ORIENTATION_ANGLE angle, BOOL is_sideways, FLOAT originX, FLOAT originY, DWRITE_MATRIX *m)
{
    static const DWRITE_MATRIX transforms[] = {
        {  1.0,  0.0,  0.0,  1.0, 0.0, 0.0 },
        {  0.0,  1.0, -1.0,  0.0, 0.0, 0.0 },
        { -1.0,  0.0,  0.0, -1.0, 0.0, 0.0 },
        {  0.0, -1.0,  1.0,  0.0, 0.0, 0.0 }
    };

    TRACE("(%d %d %.2f %.2f %p)\n", angle, is_sideways, originX, originY, m);

    if ((UINT32)angle > DWRITE_GLYPH_ORIENTATION_ANGLE_270_DEGREES) {
        memset(m, 0, sizeof(*m));
        return E_INVALIDARG;
    }

    /* for sideways case simply rotate 90 degrees more */
    if (is_sideways) {
        switch (angle) {
        case DWRITE_GLYPH_ORIENTATION_ANGLE_0_DEGREES:
            angle = DWRITE_GLYPH_ORIENTATION_ANGLE_90_DEGREES;
            break;
        case DWRITE_GLYPH_ORIENTATION_ANGLE_90_DEGREES:
            angle = DWRITE_GLYPH_ORIENTATION_ANGLE_180_DEGREES;
            break;
        case DWRITE_GLYPH_ORIENTATION_ANGLE_180_DEGREES:
            angle = DWRITE_GLYPH_ORIENTATION_ANGLE_270_DEGREES;
            break;
        case DWRITE_GLYPH_ORIENTATION_ANGLE_270_DEGREES:
            angle = DWRITE_GLYPH_ORIENTATION_ANGLE_0_DEGREES;
            break;
        default:
            ;
        }
    }

    *m = transforms[angle];

    /* shift components represent transform necessary to get from original point to
       rotated one in new coordinate system */
    if ((originX != 0.0 || originY != 0.0) && angle != DWRITE_GLYPH_ORIENTATION_ANGLE_0_DEGREES) {
        m->dx = originX - (m->m11 * originX + m->m21 * originY);
        m->dy = originY - (m->m12 * originX + m->m22 * originY);
    }

    return S_OK;
}

static HRESULT WINAPI dwritetextanalyzer2_GetTypographicFeatures(IDWriteTextAnalyzer2 *iface,
    IDWriteFontFace *fontface, DWRITE_SCRIPT_ANALYSIS sa, const WCHAR *locale,
    UINT32 max_tagcount, UINT32 *actual_tagcount, DWRITE_FONT_FEATURE_TAG *tags)
{
    const struct dwritescript_properties *props;
    HRESULT hr = S_OK;
    UINT32 language;

    TRACE("(%p %u %s %u %p %p)\n", fontface, sa.script, debugstr_w(locale), max_tagcount, actual_tagcount,
        tags);

    if (sa.script > Script_LastId)
        return E_INVALIDARG;

    language = get_opentype_language(locale);
    props = &dwritescripts_properties[sa.script];
    *actual_tagcount = 0;

    if (props->scriptalttag)
        hr = opentype_get_typographic_features(fontface, props->scriptalttag, language, max_tagcount, actual_tagcount, tags);

    if (*actual_tagcount == 0)
        hr = opentype_get_typographic_features(fontface, props->scripttag, language, max_tagcount, actual_tagcount, tags);

    return hr;
};

static HRESULT WINAPI dwritetextanalyzer2_CheckTypographicFeature(IDWriteTextAnalyzer2 *iface,
    IDWriteFontFace *face, DWRITE_SCRIPT_ANALYSIS sa, const WCHAR *localeName,
    DWRITE_FONT_FEATURE_TAG feature, UINT32 glyph_count, const UINT16 *indices, UINT8 *feature_applies)
{
    FIXME("(%p %u %s %x %u %p %p): stub\n", face, sa.script, debugstr_w(localeName), feature, glyph_count, indices,
        feature_applies);
    return E_NOTIMPL;
}

static const struct IDWriteTextAnalyzer2Vtbl textanalyzervtbl = {
    dwritetextanalyzer_QueryInterface,
    dwritetextanalyzer_AddRef,
    dwritetextanalyzer_Release,
    dwritetextanalyzer_AnalyzeScript,
    dwritetextanalyzer_AnalyzeBidi,
    dwritetextanalyzer_AnalyzeNumberSubstitution,
    dwritetextanalyzer_AnalyzeLineBreakpoints,
    dwritetextanalyzer_GetGlyphs,
    dwritetextanalyzer_GetGlyphPlacements,
    dwritetextanalyzer_GetGdiCompatibleGlyphPlacements,
    dwritetextanalyzer1_ApplyCharacterSpacing,
    dwritetextanalyzer1_GetBaseline,
    dwritetextanalyzer1_AnalyzeVerticalGlyphOrientation,
    dwritetextanalyzer1_GetGlyphOrientationTransform,
    dwritetextanalyzer1_GetScriptProperties,
    dwritetextanalyzer1_GetTextComplexity,
    dwritetextanalyzer1_GetJustificationOpportunities,
    dwritetextanalyzer1_JustifyGlyphAdvances,
    dwritetextanalyzer1_GetJustifiedGlyphs,
    dwritetextanalyzer2_GetGlyphOrientationTransform,
    dwritetextanalyzer2_GetTypographicFeatures,
    dwritetextanalyzer2_CheckTypographicFeature
};

static IDWriteTextAnalyzer2 textanalyzer = { &textanalyzervtbl };

HRESULT get_textanalyzer(IDWriteTextAnalyzer **ret)
{
    *ret = (IDWriteTextAnalyzer*)&textanalyzer;
    return S_OK;
}

static HRESULT WINAPI dwritenumbersubstitution_QueryInterface(IDWriteNumberSubstitution *iface, REFIID riid, void **obj)
{
    struct dwrite_numbersubstitution *This = impl_from_IDWriteNumberSubstitution(iface);

    TRACE("(%p)->(%s %p)\n", This, debugstr_guid(riid), obj);

    if (IsEqualIID(riid, &IID_IDWriteNumberSubstitution) ||
        IsEqualIID(riid, &IID_IUnknown))
    {
        *obj = iface;
        IDWriteNumberSubstitution_AddRef(iface);
        return S_OK;
    }

    *obj = NULL;

    return E_NOINTERFACE;
}

static ULONG WINAPI dwritenumbersubstitution_AddRef(IDWriteNumberSubstitution *iface)
{
    struct dwrite_numbersubstitution *This = impl_from_IDWriteNumberSubstitution(iface);
    ULONG ref = InterlockedIncrement(&This->ref);
    TRACE("(%p)->(%d)\n", This, ref);
    return ref;
}

static ULONG WINAPI dwritenumbersubstitution_Release(IDWriteNumberSubstitution *iface)
{
    struct dwrite_numbersubstitution *This = impl_from_IDWriteNumberSubstitution(iface);
    ULONG ref = InterlockedDecrement(&This->ref);

    TRACE("(%p)->(%d)\n", This, ref);

    if (!ref) {
        heap_free(This->locale);
        heap_free(This);
    }

    return ref;
}

static const struct IDWriteNumberSubstitutionVtbl numbersubstitutionvtbl = {
    dwritenumbersubstitution_QueryInterface,
    dwritenumbersubstitution_AddRef,
    dwritenumbersubstitution_Release
};

HRESULT create_numbersubstitution(DWRITE_NUMBER_SUBSTITUTION_METHOD method, const WCHAR *locale,
    BOOL ignore_user_override, IDWriteNumberSubstitution **ret)
{
    struct dwrite_numbersubstitution *substitution;

    *ret = NULL;

    if ((UINT32)method > DWRITE_NUMBER_SUBSTITUTION_METHOD_TRADITIONAL)
        return E_INVALIDARG;

    if (method != DWRITE_NUMBER_SUBSTITUTION_METHOD_NONE && !IsValidLocaleName(locale))
        return E_INVALIDARG;

    substitution = heap_alloc(sizeof(*substitution));
    if (!substitution)
        return E_OUTOFMEMORY;

    substitution->IDWriteNumberSubstitution_iface.lpVtbl = &numbersubstitutionvtbl;
    substitution->ref = 1;
    substitution->ignore_user_override = ignore_user_override;
    substitution->method = method;
    substitution->locale = heap_strdupW(locale);
    if (locale && !substitution->locale) {
        heap_free(substitution);
        return E_OUTOFMEMORY;
    }

    *ret = &substitution->IDWriteNumberSubstitution_iface;
    return S_OK;
}