/*
 *    Methods for dealing with opentype font tables
 *
 * Copyright 2014 Aric Stewart 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 "dwrite_private.h"
#include "winternl.h"

WINE_DEFAULT_DEBUG_CHANNEL(dwrite);

#define MS_HEAD_TAG DWRITE_MAKE_OPENTYPE_TAG('h','e','a','d')
#define MS_HHEA_TAG DWRITE_MAKE_OPENTYPE_TAG('h','h','e','a')
#define MS_OTTO_TAG DWRITE_MAKE_OPENTYPE_TAG('O','T','T','O')
#define MS_OS2_TAG  DWRITE_MAKE_OPENTYPE_TAG('O','S','/','2')
#define MS_POST_TAG DWRITE_MAKE_OPENTYPE_TAG('p','o','s','t')
#define MS_TTCF_TAG DWRITE_MAKE_OPENTYPE_TAG('t','t','c','f')
#define MS_GPOS_TAG DWRITE_MAKE_OPENTYPE_TAG('G','P','O','S')
#define MS_GSUB_TAG DWRITE_MAKE_OPENTYPE_TAG('G','S','U','B')
#define MS_NAME_TAG DWRITE_MAKE_OPENTYPE_TAG('n','a','m','e')

#ifdef WORDS_BIGENDIAN
#define GET_BE_WORD(x) (x)
#define GET_BE_DWORD(x) (x)
#else
#define GET_BE_WORD(x)  RtlUshortByteSwap(x)
#define GET_BE_DWORD(x) RtlUlongByteSwap(x)
#endif

typedef struct {
    CHAR TTCTag[4];
    DWORD Version;
    DWORD numFonts;
    DWORD OffsetTable[1];
} TTC_Header_V1;

typedef struct {
    DWORD version;
    WORD numTables;
    WORD searchRange;
    WORD entrySelector;
    WORD rangeShift;
} TTC_SFNT_V1;

typedef struct {
    CHAR tag[4];
    DWORD checkSum;
    DWORD offset;
    DWORD length;
} TT_TableRecord;

typedef struct {
    WORD platformID;
    WORD encodingID;
    DWORD offset;
} CMAP_EncodingRecord;

typedef struct {
    WORD version;
    WORD numTables;
    CMAP_EncodingRecord tables[1];
} CMAP_Header;

typedef struct {
    DWORD startCharCode;
    DWORD endCharCode;
    DWORD startGlyphID;
} CMAP_SegmentedCoverage_group;

typedef struct {
    WORD format;
    WORD reserved;
    DWORD length;
    DWORD language;
    DWORD nGroups;
    CMAP_SegmentedCoverage_group groups[1];
} CMAP_SegmentedCoverage;

typedef struct {
    WORD format;
    WORD length;
    WORD language;
    WORD segCountX2;
    WORD searchRange;
    WORD entrySelector;
    WORD rangeShift;
    WORD endCode[1];
} CMAP_SegmentMapping_0;

enum OPENTYPE_CMAP_TABLE_FORMAT
{
    OPENTYPE_CMAP_TABLE_SEGMENT_MAPPING = 4,
    OPENTYPE_CMAP_TABLE_SEGMENTED_COVERAGE = 12
};

/* PANOSE is 10 bytes in size, need to pack the structure properly */
#include "pshpack2.h"
typedef struct
{
    USHORT majorVersion;
    USHORT minorVersion;
    ULONG revision;
    ULONG checksumadj;
    ULONG magic;
    USHORT flags;
    USHORT unitsPerEm;
    ULONGLONG created;
    ULONGLONG modified;
    SHORT xMin;
    SHORT yMin;
    SHORT xMax;
    SHORT yMax;
    USHORT macStyle;
    USHORT lowestRecPPEM;
    SHORT direction_hint;
    SHORT index_format;
    SHORT glyphdata_format;
} TT_HEAD;

enum TT_HEAD_MACSTYLE
{
    TT_HEAD_MACSTYLE_BOLD      = 1 << 0,
    TT_HEAD_MACSTYLE_ITALIC    = 1 << 1,
    TT_HEAD_MACSTYLE_UNDERLINE = 1 << 2,
    TT_HEAD_MACSTYLE_OUTLINE   = 1 << 3,
    TT_HEAD_MACSTYLE_SHADOW    = 1 << 4,
    TT_HEAD_MACSTYLE_CONDENSED = 1 << 5,
    TT_HEAD_MACSTYLE_EXTENDED  = 1 << 6,
};

typedef struct
{
    ULONG Version;
    ULONG italicAngle;
    SHORT underlinePosition;
    SHORT underlineThickness;
    ULONG fixed_pitch;
    ULONG minmemType42;
    ULONG maxmemType42;
    ULONG minmemType1;
    ULONG maxmemType1;
} TT_POST;

typedef struct
{
    USHORT version;
    SHORT xAvgCharWidth;
    USHORT usWeightClass;
    USHORT usWidthClass;
    SHORT fsType;
    SHORT ySubscriptXSize;
    SHORT ySubscriptYSize;
    SHORT ySubscriptXOffset;
    SHORT ySubscriptYOffset;
    SHORT ySuperscriptXSize;
    SHORT ySuperscriptYSize;
    SHORT ySuperscriptXOffset;
    SHORT ySuperscriptYOffset;
    SHORT yStrikeoutSize;
    SHORT yStrikeoutPosition;
    SHORT sFamilyClass;
    PANOSE panose;
    ULONG ulUnicodeRange1;
    ULONG ulUnicodeRange2;
    ULONG ulUnicodeRange3;
    ULONG ulUnicodeRange4;
    CHAR achVendID[4];
    USHORT fsSelection;
    USHORT usFirstCharIndex;
    USHORT usLastCharIndex;
    /* According to the Apple spec, original version didn't have the below fields,
     * version numbers were taken from the OpenType spec.
     */
    /* version 0 (TrueType 1.5) */
    USHORT sTypoAscender;
    USHORT sTypoDescender;
    USHORT sTypoLineGap;
    USHORT usWinAscent;
    USHORT usWinDescent;
    /* version 1 (TrueType 1.66) */
    ULONG ulCodePageRange1;
    ULONG ulCodePageRange2;
    /* version 2 (OpenType 1.2) */
    SHORT sxHeight;
    SHORT sCapHeight;
    USHORT usDefaultChar;
    USHORT usBreakChar;
    USHORT usMaxContext;
} TT_OS2_V2;

typedef struct {
    USHORT majorVersion;
    USHORT minorVersion;
    SHORT  ascender;
    SHORT  descender;
    SHORT  linegap;
    USHORT advanceWidthMax;
    SHORT  minLeftSideBearing;
    SHORT  minRightSideBearing;
    SHORT  xMaxExtent;
    SHORT  caretSlopeRise;
    SHORT  caretSlopeRun;
    SHORT  caretOffset;
    SHORT  reserved[4];
    SHORT  metricDataFormat;
    USHORT numberOfHMetrics;
} TT_HHEA;

#include "poppack.h"

enum OS2_FSSELECTION {
    OS2_FSSELECTION_ITALIC           = 1 << 0,
    OS2_FSSELECTION_UNDERSCORE       = 1 << 1,
    OS2_FSSELECTION_NEGATIVE         = 1 << 2,
    OS2_FSSELECTION_OUTLINED         = 1 << 3,
    OS2_FSSELECTION_STRIKEOUT        = 1 << 4,
    OS2_FSSELECTION_BOLD             = 1 << 5,
    OS2_FSSELECTION_REGULAR          = 1 << 6,
    OS2_FSSELECTION_USE_TYPO_METRICS = 1 << 7,
    OS2_FSSELECTION_WWS              = 1 << 8,
    OS2_FSSELECTION_OBLIQUE          = 1 << 9
};

typedef struct {
    WORD platformID;
    WORD encodingID;
    WORD languageID;
    WORD nameID;
    WORD length;
    WORD offset;
} TT_NameRecord;

typedef struct {
    WORD format;
    WORD count;
    WORD stringOffset;
    TT_NameRecord nameRecord[1];
} TT_NAME_V0;

struct VDMX_Header
{
    WORD version;
    WORD numRecs;
    WORD numRatios;
};

struct VDMX_Ratio
{
    BYTE bCharSet;
    BYTE xRatio;
    BYTE yStartRatio;
    BYTE yEndRatio;
};

struct VDMX_group
{
    WORD recs;
    BYTE startsz;
    BYTE endsz;
};

struct VDMX_vTable
{
    WORD yPelHeight;
    SHORT yMax;
    SHORT yMin;
};

typedef struct {
    CHAR FeatureTag[4];
    WORD Feature;
} OT_FeatureRecord;

typedef struct {
    WORD FeatureCount;
    OT_FeatureRecord FeatureRecord[1];
} OT_FeatureList;

typedef struct {
    WORD LookupOrder; /* Reserved */
    WORD ReqFeatureIndex;
    WORD FeatureCount;
    WORD FeatureIndex[1];
} OT_LangSys;

typedef struct {
    CHAR LangSysTag[4];
    WORD LangSys;
} OT_LangSysRecord;

typedef struct {
    WORD DefaultLangSys;
    WORD LangSysCount;
    OT_LangSysRecord LangSysRecord[1];
} OT_Script;

typedef struct {
    CHAR ScriptTag[4];
    WORD Script;
} OT_ScriptRecord;

typedef struct {
    WORD ScriptCount;
    OT_ScriptRecord ScriptRecord[1];
} OT_ScriptList;

typedef struct {
    DWORD version;
    WORD ScriptList;
    WORD FeatureList;
    WORD LookupList;
} GPOS_GSUB_Header;

enum OPENTYPE_PLATFORM_ID
{
    OPENTYPE_PLATFORM_UNICODE = 0,
    OPENTYPE_PLATFORM_MAC,
    OPENTYPE_PLATFORM_ISO,
    OPENTYPE_PLATFORM_WIN,
    OPENTYPE_PLATFORM_CUSTOM
};

typedef struct {
    WORD FeatureParams;
    WORD LookupCount;
    WORD LookupListIndex[1];
} OT_Feature;

typedef struct {
    WORD LookupCount;
    WORD Lookup[1];
} OT_LookupList;

typedef struct {
    WORD LookupType;
    WORD LookupFlag;
    WORD SubTableCount;
    WORD SubTable[1];
} OT_LookupTable;

typedef struct {
    WORD SubstFormat;
    WORD Coverage;
    WORD DeltaGlyphID;
} GSUB_SingleSubstFormat1;

typedef struct {
    WORD SubstFormat;
    WORD Coverage;
    WORD GlyphCount;
    WORD Substitute[1];
} GSUB_SingleSubstFormat2;

typedef struct {
    WORD SubstFormat;
    WORD ExtensionLookupType;
    DWORD ExtensionOffset;
} GSUB_ExtensionPosFormat1;

enum OPENTYPE_GPOS_LOOKUPS
{
    OPENTYPE_GPOS_SINGLE_SUBST = 1,
    OPENTYPE_GPOS_EXTENSION_SUBST = 7
};

enum TT_NAME_WINDOWS_ENCODING_ID
{
    TT_NAME_WINDOWS_ENCODING_SYMBOL = 0,
    TT_NAME_WINDOWS_ENCODING_UCS2,
    TT_NAME_WINDOWS_ENCODING_SJIS,
    TT_NAME_WINDOWS_ENCODING_PRC,
    TT_NAME_WINDOWS_ENCODING_BIG5,
    TT_NAME_WINDOWS_ENCODING_WANSUNG,
    TT_NAME_WINDOWS_ENCODING_JOHAB,
    TT_NAME_WINDOWS_ENCODING_RESERVED1,
    TT_NAME_WINDOWS_ENCODING_RESERVED2,
    TT_NAME_WINDOWS_ENCODING_RESERVED3,
    TT_NAME_WINDOWS_ENCODING_UCS4
};

enum TT_NAME_MAC_ENCODING_ID
{
    TT_NAME_MAC_ENCODING_ROMAN = 0,
    TT_NAME_MAC_ENCODING_JAPANESE,
    TT_NAME_MAC_ENCODING_TRAD_CHINESE,
    TT_NAME_MAC_ENCODING_KOREAN,
    TT_NAME_MAC_ENCODING_ARABIC,
    TT_NAME_MAC_ENCODING_HEBREW,
    TT_NAME_MAC_ENCODING_GREEK,
    TT_NAME_MAC_ENCODING_RUSSIAN,
    TT_NAME_MAC_ENCODING_RSYMBOL,
    TT_NAME_MAC_ENCODING_DEVANAGARI,
    TT_NAME_MAC_ENCODING_GURMUKHI,
    TT_NAME_MAC_ENCODING_GUJARATI,
    TT_NAME_MAC_ENCODING_ORIYA,
    TT_NAME_MAC_ENCODING_BENGALI,
    TT_NAME_MAC_ENCODING_TAMIL,
    TT_NAME_MAC_ENCODING_TELUGU,
    TT_NAME_MAC_ENCODING_KANNADA,
    TT_NAME_MAC_ENCODING_MALAYALAM,
    TT_NAME_MAC_ENCODING_SINHALESE,
    TT_NAME_MAC_ENCODING_BURMESE,
    TT_NAME_MAC_ENCODING_KHMER,
    TT_NAME_MAC_ENCODING_THAI,
    TT_NAME_MAC_ENCODING_LAOTIAN,
    TT_NAME_MAC_ENCODING_GEORGIAN,
    TT_NAME_MAC_ENCODING_ARMENIAN,
    TT_NAME_MAC_ENCODING_SIMPL_CHINESE,
    TT_NAME_MAC_ENCODING_TIBETAN,
    TT_NAME_MAC_ENCODING_MONGOLIAN,
    TT_NAME_MAC_ENCODING_GEEZ,
    TT_NAME_MAC_ENCODING_SLAVIC,
    TT_NAME_MAC_ENCODING_VIETNAMESE,
    TT_NAME_MAC_ENCODING_SINDHI,
    TT_NAME_MAC_ENCODING_UNINTERPRETED
};

enum TT_NAME_MAC_LANGUAGE_ID
{
    TT_NAME_MAC_LANGID_ENGLISH = 0,
    TT_NAME_MAC_LANGID_FRENCH,
    TT_NAME_MAC_LANGID_GERMAN,
    TT_NAME_MAC_LANGID_ITALIAN,
    TT_NAME_MAC_LANGID_DUTCH,
    TT_NAME_MAC_LANGID_SWEDISH,
    TT_NAME_MAC_LANGID_SPANISH,
    TT_NAME_MAC_LANGID_DANISH,
    TT_NAME_MAC_LANGID_PORTUGUESE,
    TT_NAME_MAC_LANGID_NORWEGIAN,
    TT_NAME_MAC_LANGID_HEBREW,
    TT_NAME_MAC_LANGID_JAPANESE,
    TT_NAME_MAC_LANGID_ARABIC,
    TT_NAME_MAC_LANGID_FINNISH,
    TT_NAME_MAC_LANGID_GREEK,
    TT_NAME_MAC_LANGID_ICELANDIC,
    TT_NAME_MAC_LANGID_MALTESE,
    TT_NAME_MAC_LANGID_TURKISH,
    TT_NAME_MAC_LANGID_CROATIAN,
    TT_NAME_MAC_LANGID_TRAD_CHINESE,
    TT_NAME_MAC_LANGID_URDU,
    TT_NAME_MAC_LANGID_HINDI,
    TT_NAME_MAC_LANGID_THAI,
    TT_NAME_MAC_LANGID_KOREAN,
    TT_NAME_MAC_LANGID_LITHUANIAN,
    TT_NAME_MAC_LANGID_POLISH,
    TT_NAME_MAC_LANGID_HUNGARIAN,
    TT_NAME_MAC_LANGID_ESTONIAN,
    TT_NAME_MAC_LANGID_LATVIAN,
    TT_NAME_MAC_LANGID_SAMI,
    TT_NAME_MAC_LANGID_FAROESE,
    TT_NAME_MAC_LANGID_FARSI,
    TT_NAME_MAC_LANGID_RUSSIAN,
    TT_NAME_MAC_LANGID_SIMPL_CHINESE,
    TT_NAME_MAC_LANGID_FLEMISH,
    TT_NAME_MAC_LANGID_GAELIC,
    TT_NAME_MAC_LANGID_ALBANIAN,
    TT_NAME_MAC_LANGID_ROMANIAN,
    TT_NAME_MAC_LANGID_CZECH,
    TT_NAME_MAC_LANGID_SLOVAK,
    TT_NAME_MAC_LANGID_SLOVENIAN,
    TT_NAME_MAC_LANGID_YIDDISH,
    TT_NAME_MAC_LANGID_SERBIAN,
    TT_NAME_MAC_LANGID_MACEDONIAN,
    TT_NAME_MAC_LANGID_BULGARIAN,
    TT_NAME_MAC_LANGID_UKRAINIAN,
    TT_NAME_MAC_LANGID_BYELORUSSIAN,
    TT_NAME_MAC_LANGID_UZBEK,
    TT_NAME_MAC_LANGID_KAZAKH,
    TT_NAME_MAC_LANGID_AZERB_CYR,
    TT_NAME_MAC_LANGID_AZERB_ARABIC,
    TT_NAME_MAC_LANGID_ARMENIAN,
    TT_NAME_MAC_LANGID_GEORGIAN,
    TT_NAME_MAC_LANGID_MOLDAVIAN,
    TT_NAME_MAC_LANGID_KIRGHIZ,
    TT_NAME_MAC_LANGID_TAJIKI,
    TT_NAME_MAC_LANGID_TURKMEN,
    TT_NAME_MAC_LANGID_MONGOLIAN,
    TT_NAME_MAC_LANGID_MONGOLIAN_CYR,
    TT_NAME_MAC_LANGID_PASHTO,
    TT_NAME_MAC_LANGID_KURDISH,
    TT_NAME_MAC_LANGID_KASHMIRI,
    TT_NAME_MAC_LANGID_SINDHI,
    TT_NAME_MAC_LANGID_TIBETAN,
    TT_NAME_MAC_LANGID_NEPALI,
    TT_NAME_MAC_LANGID_SANSKRIT,
    TT_NAME_MAC_LANGID_MARATHI,
    TT_NAME_MAC_LANGID_BENGALI,
    TT_NAME_MAC_LANGID_ASSAMESE,
    TT_NAME_MAC_LANGID_GUJARATI,
    TT_NAME_MAC_LANGID_PUNJABI,
    TT_NAME_MAC_LANGID_ORIYA,
    TT_NAME_MAC_LANGID_MALAYALAM,
    TT_NAME_MAC_LANGID_KANNADA,
    TT_NAME_MAC_LANGID_TAMIL,
    TT_NAME_MAC_LANGID_TELUGU,
    TT_NAME_MAC_LANGID_SINHALESE,
    TT_NAME_MAC_LANGID_BURMESE,
    TT_NAME_MAC_LANGID_KHMER,
    TT_NAME_MAC_LANGID_LAO,
    TT_NAME_MAC_LANGID_VIETNAMESE,
    TT_NAME_MAC_LANGID_INDONESIAN,
    TT_NAME_MAC_LANGID_TAGALOG,
    TT_NAME_MAC_LANGID_MALAY_ROMAN,
    TT_NAME_MAC_LANGID_MALAY_ARABIC,
    TT_NAME_MAC_LANGID_AMHARIC,
    TT_NAME_MAC_LANGID_TIGRINYA,
    TT_NAME_MAC_LANGID_GALLA,
    TT_NAME_MAC_LANGID_SOMALI,
    TT_NAME_MAC_LANGID_SWAHILI,
    TT_NAME_MAC_LANGID_KINYARWANDA,
    TT_NAME_MAC_LANGID_RUNDI,
    TT_NAME_MAC_LANGID_NYANJA,
    TT_NAME_MAC_LANGID_MALAGASY,
    TT_NAME_MAC_LANGID_ESPERANTO,
    TT_NAME_MAC_LANGID_WELSH = 128,
    TT_NAME_MAC_LANGID_BASQUE,
    TT_NAME_MAC_LANGID_CATALAN,
    TT_NAME_MAC_LANGID_LATIN,
    TT_NAME_MAC_LANGID_QUECHUA,
    TT_NAME_MAC_LANGID_GUARANI,
    TT_NAME_MAC_LANGID_AYMARA,
    TT_NAME_MAC_LANGID_TATAR,
    TT_NAME_MAC_LANGID_UIGHUR,
    TT_NAME_MAC_LANGID_DZONGKHA,
    TT_NAME_MAC_LANGID_JAVANESE,
    TT_NAME_MAC_LANGID_SUNDANESE,
    TT_NAME_MAC_LANGID_GALICIAN,
    TT_NAME_MAC_LANGID_AFRIKAANS,
    TT_NAME_MAC_LANGID_BRETON,
    TT_NAME_MAC_LANGID_INUKTITUT,
    TT_NAME_MAC_LANGID_SCOTTISH_GAELIC,
    TT_NAME_MAC_LANGID_MANX_GAELIC,
    TT_NAME_MAC_LANGID_IRISH_GAELIC,
    TT_NAME_MAC_LANGID_TONGAN,
    TT_NAME_MAC_LANGID_GREEK_POLYTONIC,
    TT_NAME_MAC_LANGID_GREENLANDIC,
    TT_NAME_MAC_LANGID_AZER_ROMAN
};

/* Names are indexed with TT_NAME_MAC_LANGUAGE_ID values */
static const char name_mac_langid_to_locale[][10] = {
    "en-US",
    "fr-FR",
    "de-DE",
    "it-IT",
    "nl-NL",
    "sv-SE",
    "es-ES",
    "da-DA",
    "pt-PT",
    "no-NO",
    "he-IL",
    "ja-JP",
    "ar-AR",
    "fi-FI",
    "el-GR",
    "is-IS",
    "mt-MT",
    "tr-TR",
    "hr-HR",
    "zh-HK",
    "ur-PK",
    "hi-IN",
    "th-TH",
    "ko-KR",
    "lt-LT",
    "pl-PL",
    "hu-HU",
    "et-EE",
    "lv-LV",
    "se-NO",
    "fo-FO",
    "fa-IR",
    "ru-RU",
    "zh-CN",
    "nl-BE",
    "gd-GB",
    "sq-AL",
    "ro-RO",
    "cs-CZ",
    "sk-SK",
    "sl-SI",
    "",
    "sr-Latn",
    "mk-MK",
    "bg-BG",
    "uk-UA",
    "be-BY",
    "uz-Latn",
    "kk-KZ",
    "az-Cyrl-AZ",
    "az-AZ",
    "hy-AM",
    "ka-GE",
    "",
    "",
    "tg-TJ",
    "tk-TM",
    "mn-Mong",
    "mn-MN",
    "ps-AF",
    "ku-Arab",
    "",
    "sd-Arab",
    "bo-CN",
    "ne-NP",
    "sa-IN",
    "mr-IN",
    "bn-IN",
    "as-IN",
    "gu-IN",
    "pa-Arab",
    "or-IN",
    "ml-IN",
    "kn-IN",
    "ta-LK",
    "te-IN",
    "si-LK",
    "",
    "km-KH",
    "lo-LA",
    "vi-VN",
    "id-ID",
    "",
    "ms-MY",
    "ms-Arab",
    "am-ET",
    "ti-ET",
    "",
    "",
    "sw-KE",
    "rw-RW",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "",
    "cy-GB",
    "eu-ES",
    "ca-ES",
    "",
    "",
    "",
    "",
    "tt-RU",
    "ug-CN",
    "",
    "",
    "",
    "gl-ES",
    "af-ZA",
    "br-FR",
    "iu-Latn-CA",
    "gd-GB",
    "",
    "ga-IE",
    "",
    "",
    "kl-GL",
    "az-Latn"
};

enum OPENTYPE_STRING_ID
{
    OPENTYPE_STRING_COPYRIGHT_NOTICE = 0,
    OPENTYPE_STRING_FAMILY_NAME,
    OPENTYPE_STRING_SUBFAMILY_NAME,
    OPENTYPE_STRING_UNIQUE_IDENTIFIER,
    OPENTYPE_STRING_FULL_FONTNAME,
    OPENTYPE_STRING_VERSION_STRING,
    OPENTYPE_STRING_POSTSCRIPT_FONTNAME,
    OPENTYPE_STRING_TRADEMARK,
    OPENTYPE_STRING_MANUFACTURER,
    OPENTYPE_STRING_DESIGNER,
    OPENTYPE_STRING_DESCRIPTION,
    OPENTYPE_STRING_VENDOR_URL,
    OPENTYPE_STRING_DESIGNER_URL,
    OPENTYPE_STRING_LICENSE_DESCRIPTION,
    OPENTYPE_STRING_LICENSE_INFO_URL,
    OPENTYPE_STRING_RESERVED_ID15,
    OPENTYPE_STRING_PREFERRED_FAMILY_NAME,
    OPENTYPE_STRING_PREFERRED_SUBFAMILY_NAME,
    OPENTYPE_STRING_COMPATIBLE_FULLNAME,
    OPENTYPE_STRING_SAMPLE_TEXT,
    OPENTYPE_STRING_POSTSCRIPT_CID_NAME,
    OPENTYPE_STRING_WWS_FAMILY_NAME,
    OPENTYPE_STRING_WWS_SUBFAMILY_NAME
};

static const UINT16 dwriteid_to_opentypeid[DWRITE_INFORMATIONAL_STRING_POSTSCRIPT_CID_NAME+1] =
{
    (UINT16)-1, /* DWRITE_INFORMATIONAL_STRING_NONE is not used */
    OPENTYPE_STRING_COPYRIGHT_NOTICE,
    OPENTYPE_STRING_VERSION_STRING,
    OPENTYPE_STRING_TRADEMARK,
    OPENTYPE_STRING_MANUFACTURER,
    OPENTYPE_STRING_DESIGNER,
    OPENTYPE_STRING_DESIGNER_URL,
    OPENTYPE_STRING_DESCRIPTION,
    OPENTYPE_STRING_VENDOR_URL,
    OPENTYPE_STRING_LICENSE_DESCRIPTION,
    OPENTYPE_STRING_LICENSE_INFO_URL,
    OPENTYPE_STRING_FAMILY_NAME,
    OPENTYPE_STRING_SUBFAMILY_NAME,
    OPENTYPE_STRING_PREFERRED_FAMILY_NAME,
    OPENTYPE_STRING_PREFERRED_SUBFAMILY_NAME,
    OPENTYPE_STRING_SAMPLE_TEXT,
    OPENTYPE_STRING_FULL_FONTNAME,
    OPENTYPE_STRING_POSTSCRIPT_FONTNAME,
    OPENTYPE_STRING_POSTSCRIPT_CID_NAME
};

/* CPAL table */
struct CPAL_Header_0
{
    USHORT version;
    USHORT numPaletteEntries;
    USHORT numPalette;
    USHORT numColorRecords;
    ULONG  offsetFirstColorRecord;
    USHORT colorRecordIndices[1];
};

/* for version == 1, this comes after full CPAL_Header_0 */
struct CPAL_SubHeader_1
{
    ULONG  offsetPaletteTypeArray;
    ULONG  offsetPaletteLabelArray;
    ULONG  offsetPaletteEntryLabelArray;
};

struct CPAL_ColorRecord
{
    BYTE blue;
    BYTE green;
    BYTE red;
    BYTE alpha;
};

/* COLR table */
struct COLR_Header
{
    USHORT version;
    USHORT numBaseGlyphRecords;
    ULONG  offsetBaseGlyphRecord;
    ULONG  offsetLayerRecord;
    USHORT numLayerRecords;
};

struct COLR_BaseGlyphRecord
{
    USHORT GID;
    USHORT firstLayerIndex;
    USHORT numLayers;
};

struct COLR_LayerRecord
{
    USHORT GID;
    USHORT paletteIndex;
};

BOOL is_face_type_supported(DWRITE_FONT_FACE_TYPE type)
{
    return (type == DWRITE_FONT_FACE_TYPE_CFF) ||
           (type == DWRITE_FONT_FACE_TYPE_TRUETYPE) ||
           (type == DWRITE_FONT_FACE_TYPE_OPENTYPE_COLLECTION) ||
           (type == DWRITE_FONT_FACE_TYPE_RAW_CFF);
}

typedef HRESULT (*dwrite_fontfile_analyzer)(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
    DWRITE_FONT_FACE_TYPE *face_type);

static HRESULT opentype_ttc_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
    DWRITE_FONT_FACE_TYPE *face_type)
{
    static const DWORD ttctag = MS_TTCF_TAG;
    const TTC_Header_V1 *header;
    void *context;
    HRESULT hr;

    hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(header), &context);
    if (FAILED(hr))
        return hr;

    if (!memcmp(header->TTCTag, &ttctag, sizeof(ttctag))) {
        *font_count = GET_BE_DWORD(header->numFonts);
        *file_type = DWRITE_FONT_FILE_TYPE_OPENTYPE_COLLECTION;
        *face_type = DWRITE_FONT_FACE_TYPE_OPENTYPE_COLLECTION;
    }

    IDWriteFontFileStream_ReleaseFileFragment(stream, context);

    return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}

static HRESULT opentype_ttf_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
    DWRITE_FONT_FACE_TYPE *face_type)
{
    const DWORD *header;
    void *context;
    HRESULT hr;

    hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(*header), &context);
    if (FAILED(hr))
        return hr;

    if (GET_BE_DWORD(*header) == 0x10000) {
        *font_count = 1;
        *file_type = DWRITE_FONT_FILE_TYPE_TRUETYPE;
        *face_type = DWRITE_FONT_FACE_TYPE_TRUETYPE;
    }

    IDWriteFontFileStream_ReleaseFileFragment(stream, context);

    return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}

static HRESULT opentype_otf_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
    DWRITE_FONT_FACE_TYPE *face_type)
{
    const DWORD *header;
    void *context;
    HRESULT hr;

    hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(*header), &context);
    if (FAILED(hr))
        return hr;

    if (GET_BE_DWORD(*header) == MS_OTTO_TAG) {
        *font_count = 1;
        *file_type = DWRITE_FONT_FILE_TYPE_CFF;
        *face_type = DWRITE_FONT_FACE_TYPE_CFF;
    }

    IDWriteFontFileStream_ReleaseFileFragment(stream, context);

    return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}

static HRESULT opentype_type1_analyzer(IDWriteFontFileStream *stream, UINT32 *font_count, DWRITE_FONT_FILE_TYPE *file_type,
    DWRITE_FONT_FACE_TYPE *face_type)
{
#include "pshpack1.h"
    /* Specified in Adobe TechNote #5178 */
    struct pfm_header {
        WORD  dfVersion;
        DWORD dfSize;
        char  data0[95];
        DWORD dfDevice;
        char  data1[12];
    };
#include "poppack.h"
    struct type1_header {
        WORD tag;
        char data[14];
    };
    const struct type1_header *header;
    void *context;
    HRESULT hr;

    hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&header, 0, sizeof(*header), &context);
    if (FAILED(hr))
        return hr;

    /* tag is followed by plain text section */
    if (header->tag == 0x8001 &&
        (!memcmp(header->data, "%!PS-AdobeFont", 14) ||
         !memcmp(header->data, "%!FontType", 10))) {
        *font_count = 1;
        *file_type = DWRITE_FONT_FILE_TYPE_TYPE1_PFB;
        *face_type = DWRITE_FONT_FACE_TYPE_TYPE1;
    }

    IDWriteFontFileStream_ReleaseFileFragment(stream, context);

    /* let's see if it's a .pfm metrics file */
    if (*file_type == DWRITE_FONT_FILE_TYPE_UNKNOWN) {
        const struct pfm_header *pfm_header;
        UINT64 filesize;
        DWORD offset;
        BOOL header_checked;

        hr = IDWriteFontFileStream_GetFileSize(stream, &filesize);
        if (FAILED(hr))
            return hr;

        hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&pfm_header, 0, sizeof(*pfm_header), &context);
        if (FAILED(hr))
            return hr;

        offset = pfm_header->dfDevice;
        header_checked = pfm_header->dfVersion == 0x100 && pfm_header->dfSize == filesize;
        IDWriteFontFileStream_ReleaseFileFragment(stream, context);

        /* as a last test check static string in PostScript information section */
        if (header_checked) {
            static const char postscript[] = "PostScript";
            char *devtype_name;

            hr = IDWriteFontFileStream_ReadFileFragment(stream, (const void**)&devtype_name, offset, sizeof(postscript), &context);
            if (FAILED(hr))
                return hr;

            if (!memcmp(devtype_name, postscript, sizeof(postscript))) {
                *font_count = 1;
                *file_type = DWRITE_FONT_FILE_TYPE_TYPE1_PFM;
                *face_type = DWRITE_FONT_FACE_TYPE_TYPE1;
            }

            IDWriteFontFileStream_ReleaseFileFragment(stream, context);
        }
    }

    return *file_type != DWRITE_FONT_FILE_TYPE_UNKNOWN ? S_OK : S_FALSE;
}

HRESULT opentype_analyze_font(IDWriteFontFileStream *stream, UINT32* font_count, DWRITE_FONT_FILE_TYPE *file_type, DWRITE_FONT_FACE_TYPE *face_type, BOOL *supported)
{
    static dwrite_fontfile_analyzer fontfile_analyzers[] = {
        opentype_ttf_analyzer,
        opentype_otf_analyzer,
        opentype_ttc_analyzer,
        opentype_type1_analyzer,
        NULL
    };
    dwrite_fontfile_analyzer *analyzer = fontfile_analyzers;
    DWRITE_FONT_FACE_TYPE face;
    HRESULT hr;

    if (!face_type)
        face_type = &face;

    *file_type = DWRITE_FONT_FILE_TYPE_UNKNOWN;
    *face_type = DWRITE_FONT_FACE_TYPE_UNKNOWN;
    *font_count = 0;

    while (*analyzer) {
        hr = (*analyzer)(stream, font_count, file_type, face_type);
        if (FAILED(hr))
            return hr;

        if (hr == S_OK)
            break;

        analyzer++;
    }

    *supported = is_face_type_supported(*face_type);
    return S_OK;
}

HRESULT opentype_get_font_table(struct file_stream_desc *stream_desc, UINT32 tag, const void **table_data,
    void **table_context, UINT32 *table_size, BOOL *found)
{
    HRESULT hr;
    TTC_SFNT_V1 *font_header = NULL;
    void *sfnt_context;
    TT_TableRecord *table_record = NULL;
    void *table_record_context;
    int table_count, table_offset = 0;
    int i;

    if (found) *found = FALSE;
    if (table_size) *table_size = 0;

    *table_data = NULL;
    *table_context = NULL;

    if (stream_desc->face_type == DWRITE_FONT_FACE_TYPE_OPENTYPE_COLLECTION) {
        const TTC_Header_V1 *ttc_header;
        void * ttc_context;
        hr = IDWriteFontFileStream_ReadFileFragment(stream_desc->stream, (const void**)&ttc_header, 0, sizeof(*ttc_header), &ttc_context);
        if (SUCCEEDED(hr)) {
            if (stream_desc->face_index >= GET_BE_DWORD(ttc_header->numFonts))
                hr = E_INVALIDARG;
            else {
                table_offset = GET_BE_DWORD(ttc_header->OffsetTable[stream_desc->face_index]);
                hr = IDWriteFontFileStream_ReadFileFragment(stream_desc->stream, (const void**)&font_header, table_offset, sizeof(*font_header), &sfnt_context);
            }
            IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, ttc_context);
        }
    }
    else
        hr = IDWriteFontFileStream_ReadFileFragment(stream_desc->stream, (const void**)&font_header, 0, sizeof(*font_header), &sfnt_context);

    if (FAILED(hr))
        return hr;

    table_count = GET_BE_WORD(font_header->numTables);
    table_offset += sizeof(*font_header);
    for (i = 0; i < table_count; i++)
    {
        hr = IDWriteFontFileStream_ReadFileFragment(stream_desc->stream, (const void**)&table_record, table_offset, sizeof(*table_record), &table_record_context);
        if (FAILED(hr))
            break;
        if (DWRITE_MAKE_OPENTYPE_TAG(table_record->tag[0], table_record->tag[1], table_record->tag[2], table_record->tag[3]) == tag)
            break;
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, table_record_context);
        table_offset += sizeof(*table_record);
    }

    IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, sfnt_context);
    if (SUCCEEDED(hr) && i < table_count)
    {
        int offset = GET_BE_DWORD(table_record->offset);
        int length = GET_BE_DWORD(table_record->length);
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, table_record_context);

        if (found) *found = TRUE;
        if (table_size) *table_size = length;
        hr = IDWriteFontFileStream_ReadFileFragment(stream_desc->stream, table_data, offset, length, table_context);
    }

    return hr;
}

/**********
 * CMAP
 **********/

static UINT32 opentype_cmap_get_unicode_ranges_count(const CMAP_Header *CMAP_Table)
{
    UINT32 count = 0;
    int i;

    for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables); i++) {
        WORD type;
        WORD *table;

        if (GET_BE_WORD(CMAP_Table->tables[i].platformID) != 3)
            continue;

        table = (WORD*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
        type = GET_BE_WORD(*table);
        TRACE("table type %i\n", type);

        switch (type)
        {
            case OPENTYPE_CMAP_TABLE_SEGMENT_MAPPING:
            {
                CMAP_SegmentMapping_0 *format = (CMAP_SegmentMapping_0*)table;
                count += GET_BE_WORD(format->segCountX2)/2;
                break;
            }
            case OPENTYPE_CMAP_TABLE_SEGMENTED_COVERAGE:
            {
                CMAP_SegmentedCoverage *format = (CMAP_SegmentedCoverage*)table;
                count += GET_BE_DWORD(format->nGroups);
                break;
            }
            default:
                FIXME("table type %i unhandled.\n", type);
        }
    }

    return count;
}

HRESULT opentype_cmap_get_unicode_ranges(void *data, UINT32 max_count, DWRITE_UNICODE_RANGE *ranges, UINT32 *count)
{
    CMAP_Header *CMAP_Table = data;
    int i, k = 0;

    if (!CMAP_Table)
        return E_FAIL;

    *count = opentype_cmap_get_unicode_ranges_count(CMAP_Table);

    for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables) && k < max_count; i++)
    {
        WORD type;
        WORD *table;
        int j;

        if (GET_BE_WORD(CMAP_Table->tables[i].platformID) != 3)
            continue;

        table = (WORD*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
        type = GET_BE_WORD(*table);
        TRACE("table type %i\n", type);

        switch (type)
        {
            case OPENTYPE_CMAP_TABLE_SEGMENT_MAPPING:
            {
                CMAP_SegmentMapping_0 *format = (CMAP_SegmentMapping_0*)table;
                UINT16 segment_count = GET_BE_WORD(format->segCountX2)/2;
                UINT16 *startCode = (WORD*)((BYTE*)format + sizeof(CMAP_SegmentMapping_0) + (sizeof(WORD) * segment_count));

                for (j = 0; j < segment_count && GET_BE_WORD(format->endCode[j]) < 0xffff && k < max_count; j++, k++) {
                    ranges[k].first = GET_BE_WORD(startCode[j]);
                    ranges[k].last  = GET_BE_WORD(format->endCode[j]);
                }
                break;
            }
            case OPENTYPE_CMAP_TABLE_SEGMENTED_COVERAGE:
            {
                CMAP_SegmentedCoverage *format = (CMAP_SegmentedCoverage*)table;
                for (j = 0; j < GET_BE_DWORD(format->nGroups) && k < max_count; j++, k++) {
                    ranges[k].first = GET_BE_DWORD(format->groups[j].startCharCode);
                    ranges[k].last  = GET_BE_DWORD(format->groups[j].endCharCode);
                }
                break;
            }
            default:
                FIXME("table type %i unhandled.\n", type);
        }
    }

    return *count > max_count ? E_NOT_SUFFICIENT_BUFFER : S_OK;
}

void opentype_get_font_metrics(struct file_stream_desc *stream_desc, DWRITE_FONT_METRICS1 *metrics, DWRITE_CARET_METRICS *caret)
{
    void *os2_context, *head_context, *post_context, *hhea_context;
    const TT_OS2_V2 *tt_os2;
    const TT_HEAD *tt_head;
    const TT_POST *tt_post;
    const TT_HHEA *tt_hhea;

    memset(metrics, 0, sizeof(*metrics));

    opentype_get_font_table(stream_desc, MS_OS2_TAG,  (const void**)&tt_os2, &os2_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_HEAD_TAG, (const void**)&tt_head, &head_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_POST_TAG, (const void**)&tt_post, &post_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_HHEA_TAG, (const void**)&tt_hhea, &hhea_context, NULL, NULL);

    if (tt_head) {
        metrics->designUnitsPerEm = GET_BE_WORD(tt_head->unitsPerEm);
        metrics->glyphBoxLeft = GET_BE_WORD(tt_head->xMin);
        metrics->glyphBoxTop = GET_BE_WORD(tt_head->yMax);
        metrics->glyphBoxRight = GET_BE_WORD(tt_head->xMax);
        metrics->glyphBoxBottom = GET_BE_WORD(tt_head->yMin);
    }

    if (caret) {
        if (tt_hhea) {
            caret->slopeRise = GET_BE_WORD(tt_hhea->caretSlopeRise);
            caret->slopeRun = GET_BE_WORD(tt_hhea->caretSlopeRun);
            caret->offset = GET_BE_WORD(tt_hhea->caretOffset);
        }
        else {
            caret->slopeRise = 0;
            caret->slopeRun = 0;
            caret->offset = 0;
        }
    }

    if (tt_os2) {
        USHORT version = GET_BE_WORD(tt_os2->version);

        metrics->ascent  = GET_BE_WORD(tt_os2->usWinAscent);
        /* Some fonts have usWinDescent value stored as signed short, which could be wrongly
           interpreted as large unsigned value. */
        metrics->descent = abs((SHORT)GET_BE_WORD(tt_os2->usWinDescent));

        /* line gap is estimated using two sets of ascender/descender values and 'hhea' line gap */
        if (tt_hhea) {
            SHORT descender = (SHORT)GET_BE_WORD(tt_hhea->descender);
            INT32 linegap;

            linegap = GET_BE_WORD(tt_hhea->ascender) + abs(descender) + GET_BE_WORD(tt_hhea->linegap) -
                metrics->ascent - metrics->descent;
            metrics->lineGap = linegap > 0 ? linegap : 0;
        }

        metrics->strikethroughPosition  = GET_BE_WORD(tt_os2->yStrikeoutPosition);
        metrics->strikethroughThickness = GET_BE_WORD(tt_os2->yStrikeoutSize);
        metrics->subscriptPositionX = GET_BE_WORD(tt_os2->ySubscriptXOffset);
        /* Y offset is stored as positive offset below baseline */
        metrics->subscriptPositionY = -GET_BE_WORD(tt_os2->ySubscriptYOffset);
        metrics->subscriptSizeX = GET_BE_WORD(tt_os2->ySubscriptXSize);
        metrics->subscriptSizeY = GET_BE_WORD(tt_os2->ySubscriptYSize);
        metrics->superscriptPositionX = GET_BE_WORD(tt_os2->ySuperscriptXOffset);
        metrics->superscriptPositionY = GET_BE_WORD(tt_os2->ySuperscriptYOffset);
        metrics->superscriptSizeX = GET_BE_WORD(tt_os2->ySuperscriptXSize);
        metrics->superscriptSizeY = GET_BE_WORD(tt_os2->ySuperscriptYSize);

        /* version 2 fields */
        if (version >= 2) {
            metrics->capHeight = GET_BE_WORD(tt_os2->sCapHeight);
            metrics->xHeight   = GET_BE_WORD(tt_os2->sxHeight);
        }

        if (GET_BE_WORD(tt_os2->fsSelection) & OS2_FSSELECTION_USE_TYPO_METRICS) {
            SHORT descent = GET_BE_WORD(tt_os2->sTypoDescender);
            metrics->ascent = GET_BE_WORD(tt_os2->sTypoAscender);
            metrics->descent = descent < 0 ? -descent : 0;
            metrics->lineGap = GET_BE_WORD(tt_os2->sTypoLineGap);
            metrics->hasTypographicMetrics = TRUE;
        }
    }

    if (tt_post) {
        metrics->underlinePosition = GET_BE_WORD(tt_post->underlinePosition);
        metrics->underlineThickness = GET_BE_WORD(tt_post->underlineThickness);
    }

    if (metrics->underlineThickness == 0)
        metrics->underlineThickness = metrics->designUnitsPerEm / 14;
    if (metrics->strikethroughThickness == 0)
        metrics->strikethroughThickness = metrics->underlineThickness;

    /* estimate missing metrics */
    if (metrics->xHeight == 0)
        metrics->xHeight = metrics->designUnitsPerEm / 2;
    if (metrics->capHeight == 0)
        metrics->capHeight = metrics->designUnitsPerEm * 7 / 10;

    if (tt_os2)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
    if (tt_head)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, head_context);
    if (tt_post)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, post_context);
    if (tt_hhea)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, hhea_context);
}

void opentype_get_font_properties(struct file_stream_desc *stream_desc, struct dwrite_font_props *props)
{
    void *os2_context, *head_context;
    const TT_OS2_V2 *tt_os2;
    const TT_HEAD *tt_head;

    opentype_get_font_table(stream_desc, MS_OS2_TAG,  (const void**)&tt_os2, &os2_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_HEAD_TAG, (const void**)&tt_head, &head_context, NULL, NULL);

    /* default stretch, weight and style to normal */
    props->stretch = DWRITE_FONT_STRETCH_NORMAL;
    props->weight = DWRITE_FONT_WEIGHT_NORMAL;
    props->style = DWRITE_FONT_STYLE_NORMAL;
    memset(&props->panose, 0, sizeof(props->panose));
    memset(&props->lf, 0, sizeof(props->lf));

    /* DWRITE_FONT_STRETCH enumeration values directly match font data values */
    if (tt_os2) {
        USHORT version = GET_BE_WORD(tt_os2->version);
        USHORT fsSelection = GET_BE_WORD(tt_os2->fsSelection);
        USHORT usWeightClass = GET_BE_WORD(tt_os2->usWeightClass);
        USHORT usWidthClass = GET_BE_WORD(tt_os2->usWidthClass);

        if (usWidthClass > DWRITE_FONT_STRETCH_UNDEFINED && usWidthClass <= DWRITE_FONT_STRETCH_ULTRA_EXPANDED)
            props->stretch = usWidthClass;

        if (usWeightClass >= 1 && usWeightClass <= 9)
            usWeightClass *= 100;

        if (usWeightClass > DWRITE_FONT_WEIGHT_ULTRA_BLACK)
            props->weight = DWRITE_FONT_WEIGHT_ULTRA_BLACK;
        else if (usWeightClass > 0)
            props->weight = usWeightClass;

        if (version >= 4 && (fsSelection & OS2_FSSELECTION_OBLIQUE))
            props->style = DWRITE_FONT_STYLE_OBLIQUE;
        else if (fsSelection & OS2_FSSELECTION_ITALIC)
            props->style = DWRITE_FONT_STYLE_ITALIC;

        memcpy(&props->panose, &tt_os2->panose, sizeof(props->panose));
    }
    else if (tt_head) {
        USHORT macStyle = GET_BE_WORD(tt_head->macStyle);

        if (macStyle & TT_HEAD_MACSTYLE_CONDENSED)
            props->stretch = DWRITE_FONT_STRETCH_CONDENSED;
        else if (macStyle & TT_HEAD_MACSTYLE_EXTENDED)
            props->stretch = DWRITE_FONT_STRETCH_EXPANDED;

        if (macStyle & TT_HEAD_MACSTYLE_BOLD)
            props->weight = DWRITE_FONT_WEIGHT_BOLD;

        if (macStyle & TT_HEAD_MACSTYLE_ITALIC)
            props->style = DWRITE_FONT_STYLE_ITALIC;
    }

    props->lf.lfWeight = props->weight;
    props->lf.lfItalic = props->style == DWRITE_FONT_STYLE_ITALIC;

    TRACE("stretch=%d, weight=%d, style %d\n", props->stretch, props->weight, props->style);

    if (tt_os2)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
    if (tt_head)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, head_context);
}

static UINT get_name_record_codepage(enum OPENTYPE_PLATFORM_ID platform, USHORT encoding)
{
    UINT codepage = 0;

    switch (platform) {
    case OPENTYPE_PLATFORM_UNICODE:
        break;
    case OPENTYPE_PLATFORM_MAC:
        switch (encoding)
        {
            case TT_NAME_MAC_ENCODING_ROMAN:
                codepage = 10000;
                break;
            case TT_NAME_MAC_ENCODING_JAPANESE:
                codepage = 10001;
                break;
            case TT_NAME_MAC_ENCODING_TRAD_CHINESE:
                codepage = 10002;
                break;
            case TT_NAME_MAC_ENCODING_KOREAN:
                codepage = 10003;
                break;
            case TT_NAME_MAC_ENCODING_ARABIC:
                codepage = 10004;
                break;
            case TT_NAME_MAC_ENCODING_HEBREW:
                codepage = 10005;
                break;
            case TT_NAME_MAC_ENCODING_GREEK:
                codepage = 10006;
                break;
            case TT_NAME_MAC_ENCODING_RUSSIAN:
                codepage = 10007;
                break;
            case TT_NAME_MAC_ENCODING_SIMPL_CHINESE:
                codepage = 10008;
                break;
            case TT_NAME_MAC_ENCODING_THAI:
                codepage = 10021;
                break;
            default:
                FIXME("encoding %u not handled, platform %d.\n", encoding, platform);
                break;
        }
        break;
    case OPENTYPE_PLATFORM_WIN:
        switch (encoding)
        {
            case TT_NAME_WINDOWS_ENCODING_SYMBOL:
            case TT_NAME_WINDOWS_ENCODING_UCS2:
                break;
            case TT_NAME_WINDOWS_ENCODING_SJIS:
                codepage = 932;
                break;
            case TT_NAME_WINDOWS_ENCODING_PRC:
                codepage = 936;
                break;
            case TT_NAME_WINDOWS_ENCODING_BIG5:
                codepage = 950;
                break;
            case TT_NAME_WINDOWS_ENCODING_WANSUNG:
                codepage = 20949;
                break;
            case TT_NAME_WINDOWS_ENCODING_JOHAB:
                codepage = 1361;
                break;
            default:
                FIXME("encoding %u not handled, platform %d.\n", encoding, platform);
                break;
        }
        break;
    default:
        FIXME("unknown platform %d\n", platform);
    }

    return codepage;
}

static void get_name_record_locale(enum OPENTYPE_PLATFORM_ID platform, USHORT lang_id, WCHAR *locale, USHORT locale_len)
{
    static const WCHAR enusW[] = {'e','n','-','U','S',0};

    switch (platform) {
    case OPENTYPE_PLATFORM_MAC:
    {
        const char *locale_name = NULL;

        if (lang_id > TT_NAME_MAC_LANGID_AZER_ROMAN)
            WARN("invalid mac lang id %d\n", lang_id);
        else if (!name_mac_langid_to_locale[lang_id][0])
            FIXME("failed to map mac lang id %d to locale name\n", lang_id);
        else
            locale_name = name_mac_langid_to_locale[lang_id];

        if (locale_name)
            MultiByteToWideChar(CP_ACP, 0, name_mac_langid_to_locale[lang_id], -1, locale, locale_len);
        else
            strcpyW(locale, enusW);
        break;
    }
    case OPENTYPE_PLATFORM_WIN:
        if (!LCIDToLocaleName(MAKELCID(lang_id, SORT_DEFAULT), locale, locale_len, 0)) {
            FIXME("failed to get locale name for lcid=0x%08x\n", MAKELCID(lang_id, SORT_DEFAULT));
            strcpyW(locale, enusW);
        }
        break;
    case OPENTYPE_PLATFORM_UNICODE:
        strcpyW(locale, enusW);
        break;
    default:
        FIXME("unknown platform %d\n", platform);
    }
}

static BOOL opentype_decode_namerecord(const TT_NAME_V0 *header, BYTE *storage_area, USHORT recid, IDWriteLocalizedStrings *strings)
{
    const TT_NameRecord *record = &header->nameRecord[recid];
    USHORT lang_id, length, offset, encoding, platform;
    BOOL ret = FALSE;

    platform = GET_BE_WORD(record->platformID);
    lang_id = GET_BE_WORD(record->languageID);
    length = GET_BE_WORD(record->length);
    offset = GET_BE_WORD(record->offset);
    encoding = GET_BE_WORD(record->encodingID);

    if (lang_id < 0x8000) {
        WCHAR locale[LOCALE_NAME_MAX_LENGTH];
        WCHAR *name_string;
        UINT codepage;

        codepage = get_name_record_codepage(platform, encoding);
        get_name_record_locale(platform, lang_id, locale, sizeof(locale)/sizeof(WCHAR));

        if (codepage) {
            DWORD len = MultiByteToWideChar(codepage, 0, (LPSTR)(storage_area + offset), length, NULL, 0);
            name_string = heap_alloc(sizeof(WCHAR) * (len+1));
            MultiByteToWideChar(codepage, 0, (LPSTR)(storage_area + offset), length, name_string, len);
            name_string[len] = 0;
        }
        else {
            int i;

            length /= sizeof(WCHAR);
            name_string = heap_strdupnW((LPWSTR)(storage_area + offset), length);
            for (i = 0; i < length; i++)
                name_string[i] = GET_BE_WORD(name_string[i]);
        }

        TRACE("string %s for locale %s found\n", debugstr_w(name_string), debugstr_w(locale));
        add_localizedstring(strings, locale, name_string);
        heap_free(name_string);
        ret = TRUE;
    }
    else
        FIXME("handle NAME format 1\n");

    return ret;
}

static HRESULT opentype_get_font_strings_from_id(const void *table_data, enum OPENTYPE_STRING_ID id, IDWriteLocalizedStrings **strings)
{
    const TT_NAME_V0 *header;
    BYTE *storage_area = 0;
    USHORT count = 0;
    int i, candidate;
    WORD format;
    BOOL exists;
    HRESULT hr;

    if (!table_data)
        return E_FAIL;

    hr = create_localizedstrings(strings);
    if (FAILED(hr)) return hr;

    header = table_data;
    format = GET_BE_WORD(header->format);

    switch (format) {
    case 0:
    case 1:
        break;
    default:
        FIXME("unsupported NAME format %d\n", format);
    }

    storage_area = (LPBYTE)table_data + GET_BE_WORD(header->stringOffset);
    count = GET_BE_WORD(header->count);

    exists = FALSE;
    candidate = -1;
    for (i = 0; i < count; i++) {
        const TT_NameRecord *record = &header->nameRecord[i];
        USHORT platform;

        if (GET_BE_WORD(record->nameID) != id)
            continue;

        /* Right now only accept unicode and windows encoded fonts */
        platform = GET_BE_WORD(record->platformID);
        if (platform != OPENTYPE_PLATFORM_UNICODE &&
            platform != OPENTYPE_PLATFORM_MAC &&
            platform != OPENTYPE_PLATFORM_WIN)
        {
            FIXME("platform %i not supported\n", platform);
            continue;
        }

        /* Skip such entries for now, fonts tend to duplicate those strings as
           WIN platform entries. If font does not have WIN or MAC entry for this id, we will
           use this Unicode platform entry while assuming en-US locale. */
        if (platform == OPENTYPE_PLATFORM_UNICODE) {
            candidate = i;
            continue;
        }

        if (!(exists = opentype_decode_namerecord(header, storage_area, i, *strings)))
            continue;
    }

    if (!exists) {
        if (candidate != -1)
            exists = opentype_decode_namerecord(header, storage_area, candidate, *strings);
        else {
            IDWriteLocalizedStrings_Release(*strings);
            *strings = NULL;
        }
    }

    return exists ? S_OK : E_FAIL;
}

/* Provides a conversion from DWRITE to OpenType name ids, input id should be valid, it's not checked. */
HRESULT opentype_get_font_info_strings(const void *table_data, DWRITE_INFORMATIONAL_STRING_ID id, IDWriteLocalizedStrings **strings)
{
    return opentype_get_font_strings_from_id(table_data, dwriteid_to_opentypeid[id], strings);
}

/* FamilyName locating order is WWS Family Name -> Preferred Family Name -> Family Name. If font claims to
   have 'Preferred Family Name' in WWS format, then WWS name is not used. */
HRESULT opentype_get_font_familyname(struct file_stream_desc *stream_desc, IDWriteLocalizedStrings **names)
{
    const TT_OS2_V2 *tt_os2;
    void *os2_context, *name_context;
    const void *name_table;
    HRESULT hr;

    opentype_get_font_table(stream_desc, MS_OS2_TAG,  (const void**)&tt_os2, &os2_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_NAME_TAG, &name_table, &name_context, NULL, NULL);

    *names = NULL;

    /* if Preferred Family doesn't conform to WWS model try WWS name */
    if (tt_os2 && !(GET_BE_WORD(tt_os2->fsSelection) & OS2_FSSELECTION_WWS))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_WWS_FAMILY_NAME, names);
    else
        hr = E_FAIL;

    if (FAILED(hr))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_PREFERRED_FAMILY_NAME, names);
    if (FAILED(hr))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_FAMILY_NAME, names);

    if (tt_os2)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
    if (name_context)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, name_context);

    return hr;
}

/* FaceName locating order is WWS Face Name -> Preferred Face Name -> Face Name. If font claims to
   have 'Preferred Face Name' in WWS format, then WWS name is not used. */
HRESULT opentype_get_font_facename(struct file_stream_desc *stream_desc, WCHAR *lfname, IDWriteLocalizedStrings **names)
{
    IDWriteLocalizedStrings *lfnames;
    void *os2_context, *name_context;
    const TT_OS2_V2 *tt_os2;
    const void *name_table;
    HRESULT hr;

    opentype_get_font_table(stream_desc, MS_OS2_TAG,  (const void**)&tt_os2, &os2_context, NULL, NULL);
    opentype_get_font_table(stream_desc, MS_NAME_TAG, &name_table, &name_context, NULL, NULL);

    *names = NULL;

    /* if Preferred Family doesn't conform to WWS model try WWS name */
    if (tt_os2 && !(GET_BE_WORD(tt_os2->fsSelection) & OS2_FSSELECTION_WWS))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_WWS_SUBFAMILY_NAME, names);
    else
        hr = E_FAIL;

    if (FAILED(hr))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_PREFERRED_SUBFAMILY_NAME, names);
    if (FAILED(hr))
        hr = opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_SUBFAMILY_NAME, names);

    /* User locale is preferred, with fallback to en-us. */
    *lfname = 0;
    if (SUCCEEDED(opentype_get_font_strings_from_id(name_table, OPENTYPE_STRING_FAMILY_NAME, &lfnames))) {
        static const WCHAR enusW[] = {'e','n','-','u','s',0};
        WCHAR localeW[LOCALE_NAME_MAX_LENGTH];
        UINT32 index;
        BOOL exists;

        exists = FALSE;
        if (GetSystemDefaultLocaleName(localeW, sizeof(localeW)/sizeof(WCHAR)))
            IDWriteLocalizedStrings_FindLocaleName(lfnames, localeW, &index, &exists);

        if (!exists)
            IDWriteLocalizedStrings_FindLocaleName(lfnames, enusW, &index, &exists);

        if (exists)
            IDWriteLocalizedStrings_GetString(lfnames, index, lfname, LF_FACESIZE);

        IDWriteLocalizedStrings_Release(lfnames);
    }

    if (tt_os2)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
    if (name_context)
        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, name_context);

    return hr;
}

static inline const OT_Script *opentype_get_script(const OT_ScriptList *scriptlist, UINT32 scripttag)
{
    UINT16 j;

    for (j = 0; j < GET_BE_WORD(scriptlist->ScriptCount); j++) {
        const char *tag = scriptlist->ScriptRecord[j].ScriptTag;
        if (scripttag == DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]))
            return (OT_Script*)((BYTE*)scriptlist + GET_BE_WORD(scriptlist->ScriptRecord[j].Script));
    }

    return NULL;
}

static inline const OT_LangSys *opentype_get_langsys(const OT_Script *script, UINT32 languagetag)
{
    UINT16 j;

    for (j = 0; j < GET_BE_WORD(script->LangSysCount); j++) {
        const char *tag = script->LangSysRecord[j].LangSysTag;
        if (languagetag == DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]))
            return (OT_LangSys*)((BYTE*)script + GET_BE_WORD(script->LangSysRecord[j].LangSys));
    }

    return NULL;
}

static void opentype_add_font_features(const GPOS_GSUB_Header *header, const OT_LangSys *langsys,
    UINT32 max_tagcount, UINT32 *count, DWRITE_FONT_FEATURE_TAG *tags)
{
    const OT_FeatureList *features = (const OT_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
    UINT16 j;

    for (j = 0; j < GET_BE_WORD(langsys->FeatureCount); j++) {
        const OT_FeatureRecord *feature = &features->FeatureRecord[langsys->FeatureIndex[j]];
        const char *tag = feature->FeatureTag;

        if (*count < max_tagcount)
            tags[*count] = DWRITE_MAKE_OPENTYPE_TAG(tag[0], tag[1], tag[2], tag[3]);

        (*count)++;
    }
}

HRESULT opentype_get_typographic_features(IDWriteFontFace *fontface, UINT32 scripttag, UINT32 languagetag, UINT32 max_tagcount,
    UINT32 *count, DWRITE_FONT_FEATURE_TAG *tags)
{
    UINT32 tables[2] = { MS_GSUB_TAG, MS_GPOS_TAG };
    HRESULT hr;
    UINT8 i;

    *count = 0;
    for (i = 0; i < sizeof(tables)/sizeof(tables[0]); i++) {
        const OT_ScriptList *scriptlist;
        const GPOS_GSUB_Header *header;
        const OT_Script *script;
        const void *ptr;
        void *context;
        UINT32 size;
        BOOL exists;

        exists = FALSE;
        hr = IDWriteFontFace_TryGetFontTable(fontface, tables[i], &ptr, &size, &context, &exists);
        if (FAILED(hr))
            return hr;

        if (!exists)
            continue;

        header = (const GPOS_GSUB_Header*)ptr;
        scriptlist = (const OT_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));

        script = opentype_get_script(scriptlist, scripttag);
        if (script) {
            const OT_LangSys *langsys = opentype_get_langsys(script, languagetag);
            if (langsys)
                opentype_add_font_features(header, langsys, max_tagcount, count, tags);
        }

        IDWriteFontFace_ReleaseFontTable(fontface, context);
    }

    return *count > max_tagcount ? E_NOT_SUFFICIENT_BUFFER : S_OK;
}

static const struct VDMX_group *find_vdmx_group(const struct VDMX_Header *hdr)
{
    WORD num_ratios, i, group_offset = 0;
    struct VDMX_Ratio *ratios = (struct VDMX_Ratio*)(hdr + 1);
    BYTE dev_x_ratio = 1, dev_y_ratio = 1;

    num_ratios = GET_BE_WORD(hdr->numRatios);

    for (i = 0; i < num_ratios; i++) {

        if (!ratios[i].bCharSet) continue;

        if ((ratios[i].xRatio == 0 && ratios[i].yStartRatio == 0 &&
             ratios[i].yEndRatio == 0) ||
	   (ratios[i].xRatio == dev_x_ratio && ratios[i].yStartRatio <= dev_y_ratio &&
            ratios[i].yEndRatio >= dev_y_ratio))
        {
            group_offset = GET_BE_WORD(*((WORD *)(ratios + num_ratios) + i));
            break;
        }
    }
    if (group_offset)
        return (const struct VDMX_group *)((BYTE *)hdr + group_offset);
    return NULL;
}

BOOL opentype_get_vdmx_size(const void *data, INT emsize, UINT16 *ascent, UINT16 *descent)
{
    const struct VDMX_Header *hdr = (const struct VDMX_Header*)data;
    const struct VDMX_group *group;
    const struct VDMX_vTable *tables;
    WORD recs, i;

    if (!data)
        return FALSE;

    group = find_vdmx_group(hdr);
    if (!group)
        return FALSE;

    recs = GET_BE_WORD(group->recs);
    if (emsize < group->startsz || emsize >= group->endsz) return FALSE;

    tables = (const struct VDMX_vTable *)(group + 1);
    for (i = 0; i < recs; i++) {
        WORD ppem = GET_BE_WORD(tables[i].yPelHeight);
        if (ppem > emsize) {
            FIXME("interpolate %d\n", emsize);
            return FALSE;
        }

        if (ppem == emsize) {
            *ascent = (SHORT)GET_BE_WORD(tables[i].yMax);
            *descent = -(SHORT)GET_BE_WORD(tables[i].yMin);
            return TRUE;
        }
    }
    return FALSE;
}

WORD opentype_get_gasp_flags(const WORD *ptr, UINT32 size, INT emsize)
{
    WORD num_recs, version;
    WORD flags = 0;

    if (!ptr)
        return 0;

    version  = GET_BE_WORD( *ptr++ );
    num_recs = GET_BE_WORD( *ptr++ );
    if (version > 1 || size < (num_recs * 2 + 2) * sizeof(WORD)) {
        ERR("unsupported gasp table: ver %d size %d recs %d\n", version, size, num_recs);
        goto done;
    }

    while (num_recs--) {
        flags = GET_BE_WORD( *(ptr + 1) );
        if (emsize <= GET_BE_WORD( *ptr )) break;
        ptr += 2;
    }

done:
    return flags;
}

UINT32 opentype_get_cpal_palettecount(const void *cpal)
{
    const struct CPAL_Header_0 *header = (const struct CPAL_Header_0*)cpal;
    return header ? GET_BE_WORD(header->numPalette) : 0;
}

UINT32 opentype_get_cpal_paletteentrycount(const void *cpal)
{
    const struct CPAL_Header_0 *header = (const struct CPAL_Header_0*)cpal;
    return header ? GET_BE_WORD(header->numPaletteEntries) : 0;
}

HRESULT opentype_get_cpal_entries(const void *cpal, UINT32 palette, UINT32 first_entry_index, UINT32 entry_count,
    DWRITE_COLOR_F *entries)
{
    const struct CPAL_Header_0 *header = (const struct CPAL_Header_0*)cpal;
    const struct CPAL_ColorRecord *records;
    UINT32 palettecount, entrycount, i;

    if (!header) return DWRITE_E_NOCOLOR;

    palettecount = GET_BE_WORD(header->numPalette);
    if (palette >= palettecount)
        return DWRITE_E_NOCOLOR;

    entrycount = GET_BE_WORD(header->numPaletteEntries);
    if (first_entry_index + entry_count > entrycount)
        return E_INVALIDARG;

    records = (const struct CPAL_ColorRecord*)((BYTE*)cpal + GET_BE_DWORD(header->offsetFirstColorRecord));
    first_entry_index += GET_BE_WORD(header->colorRecordIndices[palette]);

    for (i = 0; i < entry_count; i++) {
        entries[i].r = records[first_entry_index + i].red   / 255.0f;
        entries[i].g = records[first_entry_index + i].green / 255.0f;
        entries[i].b = records[first_entry_index + i].blue  / 255.0f;
        entries[i].a = records[first_entry_index + i].alpha / 255.0f;
    }

    return S_OK;
}

static int colr_compare_gid(const void *g, const void *r)
{
    const struct COLR_BaseGlyphRecord *record = r;
    UINT16 glyph = *(UINT16*)g, GID = GET_BE_WORD(record->GID);
    int ret = 0;

    if (glyph > GID)
        ret = 1;
    else if (glyph < GID)
        ret = -1;

    return ret;
}

HRESULT opentype_get_colr_glyph(const void *colr, UINT16 glyph, struct dwrite_colorglyph *ret)
{
    const struct COLR_BaseGlyphRecord *record;
    const struct COLR_Header *header = colr;
    const struct COLR_LayerRecord *layer;
    DWORD layerrecordoffset = GET_BE_DWORD(header->offsetLayerRecord);
    DWORD baserecordoffset = GET_BE_DWORD(header->offsetBaseGlyphRecord);
    WORD numbaserecords = GET_BE_WORD(header->numBaseGlyphRecords);

    record = bsearch(&glyph, (BYTE*)colr + baserecordoffset, numbaserecords, sizeof(struct COLR_BaseGlyphRecord),
        colr_compare_gid);
    if (!record) {
        ret->layer = 0;
        ret->first_layer = 0;
        ret->num_layers = 0;
        ret->glyph = glyph;
        ret->palette_index = 0xffff;
        return S_FALSE;
    }

    ret->layer = 0;
    ret->first_layer = GET_BE_WORD(record->firstLayerIndex);
    ret->num_layers = GET_BE_WORD(record->numLayers);

    layer = (struct COLR_LayerRecord*)((BYTE*)colr + layerrecordoffset) + ret->first_layer + ret->layer;
    ret->glyph = GET_BE_WORD(layer->GID);
    ret->palette_index = GET_BE_WORD(layer->paletteIndex);

    return S_OK;
}

void opentype_colr_next_glyph(const void *colr, struct dwrite_colorglyph *glyph)
{
    const struct COLR_Header *header = colr;
    const struct COLR_LayerRecord *layer;
    DWORD layerrecordoffset = GET_BE_DWORD(header->offsetLayerRecord);

    /* iterated all the way through */
    if (glyph->layer == glyph->num_layers)
        return;

    glyph->layer++;
    layer = (struct COLR_LayerRecord*)((BYTE*)colr + layerrecordoffset) + glyph->first_layer + glyph->layer;
    glyph->glyph = GET_BE_WORD(layer->GID);
    glyph->palette_index = GET_BE_WORD(layer->paletteIndex);
}

HRESULT opentype_get_font_signature(struct file_stream_desc *stream_desc, FONTSIGNATURE *fontsig)
{
    const TT_OS2_V2 *tt_os2;
    void *os2_context;
    HRESULT hr;

    hr = opentype_get_font_table(stream_desc, MS_OS2_TAG,  (const void**)&tt_os2, &os2_context, NULL, NULL);
    if (tt_os2) {
        fontsig->fsUsb[0] = GET_BE_DWORD(tt_os2->ulUnicodeRange1);
        fontsig->fsUsb[1] = GET_BE_DWORD(tt_os2->ulUnicodeRange2);
        fontsig->fsUsb[2] = GET_BE_DWORD(tt_os2->ulUnicodeRange3);
        fontsig->fsUsb[3] = GET_BE_DWORD(tt_os2->ulUnicodeRange4);

        if (GET_BE_WORD(tt_os2->version) == 0) {
            fontsig->fsCsb[0] = 0;
            fontsig->fsCsb[1] = 0;
        }
        else {
            fontsig->fsCsb[0] = GET_BE_DWORD(tt_os2->ulCodePageRange1);
            fontsig->fsCsb[1] = GET_BE_DWORD(tt_os2->ulCodePageRange2);
        }

        IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
    }

    return hr;
}

BOOL opentype_has_vertical_variants(IDWriteFontFace4 *fontface)
{
    const OT_FeatureList *featurelist;
    const OT_LookupList *lookup_list;
    BOOL exists = FALSE, ret = FALSE;
    const GPOS_GSUB_Header *header;
    const void *data;
    void *context;
    UINT32 size;
    HRESULT hr;
    UINT16 i;

    hr = IDWriteFontFace4_TryGetFontTable(fontface, MS_GSUB_TAG, &data, &size, &context, &exists);
    if (FAILED(hr) || !exists)
        return FALSE;

    header = data;
    featurelist = (OT_FeatureList*)((BYTE*)header + GET_BE_WORD(header->FeatureList));
    lookup_list = (const OT_LookupList*)((BYTE*)header + GET_BE_WORD(header->LookupList));

    for (i = 0; i < GET_BE_WORD(featurelist->FeatureCount); i++) {
        if (*(UINT32*)featurelist->FeatureRecord[i].FeatureTag == DWRITE_FONT_FEATURE_TAG_VERTICAL_WRITING) {
            const OT_Feature *feature = (const OT_Feature*)((BYTE*)featurelist + GET_BE_WORD(featurelist->FeatureRecord[i].Feature));
            UINT16 lookup_count = GET_BE_WORD(feature->LookupCount), i, index, count, type;
            const GSUB_SingleSubstFormat2 *subst2;
            const OT_LookupTable *lookup_table;
            UINT32 offset;

            if (lookup_count == 0)
                continue;

            for (i = 0; i < lookup_count; i++) {
                /* check if lookup is empty */
                index = GET_BE_WORD(feature->LookupListIndex[i]);
                lookup_table = (const OT_LookupTable*)((BYTE*)lookup_list + GET_BE_WORD(lookup_list->Lookup[index]));

                type = GET_BE_WORD(lookup_table->LookupType);
                if (type != OPENTYPE_GPOS_SINGLE_SUBST && type != OPENTYPE_GPOS_EXTENSION_SUBST)
                    continue;

                count = GET_BE_WORD(lookup_table->SubTableCount);
                if (count == 0)
                    continue;

                offset = GET_BE_WORD(lookup_table->SubTable[0]);
                if (type == OPENTYPE_GPOS_EXTENSION_SUBST) {
                    const GSUB_ExtensionPosFormat1 *ext = (const GSUB_ExtensionPosFormat1 *)((const BYTE *)lookup_table + offset);
                    if (GET_BE_WORD(ext->SubstFormat) == 1)
                        offset += GET_BE_DWORD(ext->ExtensionOffset);
                    else
                        FIXME("Unhandled Extension Substitution Format %u\n", GET_BE_WORD(ext->SubstFormat));
                }

                subst2 = (const GSUB_SingleSubstFormat2*)((BYTE*)lookup_table + offset);
                index = GET_BE_WORD(subst2->SubstFormat);
                if (index == 1)
                    FIXME("Validate Single Substitution Format 1\n");
                else if (index == 2) {
                    /* SimSun-ExtB has 0 glyph count for this substitution */
                    if (GET_BE_WORD(subst2->GlyphCount) > 0) {
                        ret = TRUE;
                        break;
                    }
                }
                else
                    WARN("Unknown Single Substitution Format, %u\n", index);
            }
        }
    }

    IDWriteFontFace4_ReleaseFontTable(fontface, context);

    return ret;
}