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/*
 * Copyright 漏 2014  Google, Inc.
 *
 *  This is part of HarfBuzz, a text shaping library.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 *
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 *
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 * Google Author(s): Behdad Esfahbod
 */

#ifndef HB_OT_SHAPE_COMPLEX_ARABIC_WIN1256_HH


/*
 * The macros in the first part of this file are generic macros that can
 * be used to define the bytes for OpenType table data in code in a
 * readable manner.  We can move the macros to reside with their respective
 * struct types, but since we only use these to define one data table, the
 * Windows-1256 Arabic shaping table in this file, we keep them here.
 */


/* First we measure, then we cut. */
#ifndef OT_MEASURE
#define OT_MEASURE
#define OT_TABLE_START                  static const struct TABLE_NAME {
#define OT_TABLE_END                    }
#define OT_LABEL_START(Name)            unsigned char Name[
#define OT_LABEL_END                    ];
#define OT_UINT8(u8)                    +1/*byte*/
#define OT_UINT16(u16)                  +2/*bytes*/
#else
#undef  OT_MEASURE
#define OT_TABLE_START                  TABLE_NAME = {
#define OT_TABLE_END                    };
#define OT_LABEL_START(Name)            {
#define OT_LABEL_END                    },
#define OT_UINT8(u8)                    (u8),
#define OT_UINT16(u16)                  (unsigned char)((u16)>>8), (unsigned char)((u16)&0xFFu),
#define OT_COUNT(Name, ItemSize)        ((unsigned int) sizeof(((struct TABLE_NAME*)0)->Name) \
                                         / (unsigned int)(ItemSize) \
                                         /* OT_ASSERT it's divisible (and positive). */)
#define OT_DISTANCE(From,To)            ((unsigned int) \
                                         ((char*)(&((struct TABLE_NAME*)0)->To) - \
                                          (char*)(&((struct TABLE_NAME*)0)->From)) \
                                         /* OT_ASSERT it's positive. */)
#endif


#define OT_LABEL(Name) \
        OT_LABEL_END \
        OT_LABEL_START(Name)

/* Whenever we receive an argument that is a list, it will expand to
 * contain commas.  That cannot be passed to another macro because the
 * commas will throw off the preprocessor.  The solution is to wrap
 * the passed-in argument in OT_LIST() before passing to the next macro.
 * Unfortunately this trick requires vararg macros. */
#define OT_LIST(...) __VA_ARGS__


/*
 * Basic Types
 */

#define OT_TAG(a,b,c,d) \
        OT_UINT8(a) OT_UINT8(b) OT_UINT8(c) OT_UINT8(d)

#define OT_OFFSET(From, To) /* Offset from From to To in bytes */ \
        OT_UINT16(OT_DISTANCE(From, To))

#define OT_GLYPHID /* GlyphID */ \
        OT_UINT16

#define OT_UARRAY(Name, Items) \
        OT_LABEL_START(Name) \
        OT_UINT16(OT_COUNT(Name##Data, 2)) \
        OT_LABEL(Name##Data) \
        Items \
        OT_LABEL_END

#define OT_UHEADLESSARRAY(Name, Items) \
        OT_LABEL_START(Name) \
        OT_UINT16(OT_COUNT(Name##Data, 2) + 1) \
        OT_LABEL(Name##Data) \
        Items \
        OT_LABEL_END


/*
 * Common Types
 */

#define OT_LOOKUP_FLAG_IGNORE_MARKS     0x08u

#define OT_LOOKUP(Name, LookupType, LookupFlag, SubLookupOffsets) \
        OT_LABEL_START(Name) \
        OT_UINT16(LookupType) \
        OT_UINT16(LookupFlag) \
        OT_LABEL_END \
        OT_UARRAY(Name##SubLookupOffsetsArray, OT_LIST(SubLookupOffsets))

#define OT_SUBLOOKUP(Name, SubFormat, Items) \
        OT_LABEL_START(Name) \
        OT_UINT16(SubFormat) \
        Items

#define OT_COVERAGE1(Name, Items) \
        OT_LABEL_START(Name) \
        OT_UINT16(1) \
        OT_LABEL_END \
        OT_UARRAY(Name##Glyphs, OT_LIST(Items))


/*
 * GSUB
 */

#define OT_LOOKUP_TYPE_SUBST_SINGLE     1u
#define OT_LOOKUP_TYPE_SUBST_LIGATURE   4u

#define OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(Name, FromGlyphs, ToGlyphs) \
        OT_SUBLOOKUP(Name, 2, \
                OT_OFFSET(Name, Name##Coverage) \
                OT_LABEL_END \
                OT_UARRAY(Name##Substitute, OT_LIST(ToGlyphs)) \
        ) \
        OT_COVERAGE1(Name##Coverage, OT_LIST(FromGlyphs)) \
        /* ASSERT_STATIC_EXPR_ZERO (len(FromGlyphs) == len(ToGlyphs)) */

#define OT_SUBLOOKUP_LIGATURE_SUBST_FORMAT1(Name, FirstGlyphs, LigatureSetOffsets) \
        OT_SUBLOOKUP(Name, 1, \
                OT_OFFSET(Name, Name##Coverage) \
                OT_LABEL_END \
                OT_UARRAY(Name##LigatureSetOffsetsArray, OT_LIST(LigatureSetOffsets)) \
        ) \
        OT_COVERAGE1(Name##Coverage, OT_LIST(FirstGlyphs)) \
        /* ASSERT_STATIC_EXPR_ZERO (len(FirstGlyphs) == len(LigatureSetOffsets)) */

#define OT_LIGATURE_SET(Name, LigatureSetOffsets) \
        OT_UARRAY(Name, OT_LIST(LigatureSetOffsets))

#define OT_LIGATURE(Name, Components, LigGlyph) \
        OT_LABEL_START(Name) \
        LigGlyph \
        OT_LABEL_END \
        OT_UHEADLESSARRAY(Name##ComponentsArray, OT_LIST(Components))

/*
 *
 * Start of Windows-1256 shaping table.
 *
 */

/* Table name. */
#define TABLE_NAME arabic_win1256_gsub_lookups

/* Table manifest. */
#define MANIFEST(Items) \
        OT_LABEL_START(manifest) \
        OT_UINT16(OT_COUNT(manifestData, 6)) \
        OT_LABEL(manifestData) \
        Items \
        OT_LABEL_END

#define MANIFEST_LOOKUP(Tag, Name) \
        Tag \
        OT_OFFSET(manifest, Name)

/* Shorthand. */
#define G       OT_GLYPHID

/*
 * Table Start
 */
OT_TABLE_START


/*
 * Manifest
 */
MANIFEST(
        MANIFEST_LOOKUP(OT_TAG('r','l','i','g'), rligLookup)
        MANIFEST_LOOKUP(OT_TAG('i','n','i','t'), initLookup)
        MANIFEST_LOOKUP(OT_TAG('m','e','d','i'), mediLookup)
        MANIFEST_LOOKUP(OT_TAG('f','i','n','a'), finaLookup)
        MANIFEST_LOOKUP(OT_TAG('r','l','i','g'), rligMarksLookup)
)

/*
 * Lookups
 */
OT_LOOKUP(initLookup, OT_LOOKUP_TYPE_SUBST_SINGLE, OT_LOOKUP_FLAG_IGNORE_MARKS,
        OT_OFFSET(initLookup, initmediSubLookup)
        OT_OFFSET(initLookup, initSubLookup)
)
OT_LOOKUP(mediLookup, OT_LOOKUP_TYPE_SUBST_SINGLE, OT_LOOKUP_FLAG_IGNORE_MARKS,
        OT_OFFSET(mediLookup, initmediSubLookup)
        OT_OFFSET(mediLookup, mediSubLookup)
        OT_OFFSET(mediLookup, medifinaLamAlefSubLookup)
)
OT_LOOKUP(finaLookup, OT_LOOKUP_TYPE_SUBST_SINGLE, OT_LOOKUP_FLAG_IGNORE_MARKS,
        OT_OFFSET(finaLookup, finaSubLookup)
        /* We don't need this one currently as the sequence inherits masks
         * from the first item.  Just in case we change that in the future
         * to be smart about Arabic masks when ligating... */
        OT_OFFSET(finaLookup, medifinaLamAlefSubLookup)
)
OT_LOOKUP(rligLookup, OT_LOOKUP_TYPE_SUBST_LIGATURE, OT_LOOKUP_FLAG_IGNORE_MARKS,
        OT_OFFSET(rligLookup, lamAlefLigaturesSubLookup)
)
OT_LOOKUP(rligMarksLookup, OT_LOOKUP_TYPE_SUBST_LIGATURE, 0,
        OT_OFFSET(rligMarksLookup, shaddaLigaturesSubLookup)
)

/*
 * init/medi/fina forms
 */
OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(initmediSubLookup,
        G(198)  G(200)  G(201)  G(202)  G(203)  G(204)  G(205)  G(206)  G(211)
        G(212)  G(213)  G(214)  G(223)  G(225)  G(227)  G(228)  G(236)  G(237),
        G(162)  G(4)    G(5)    G(5)    G(6)    G(7)    G(9)    G(11)   G(13)
        G(14)   G(15)   G(26)   G(140)  G(141)  G(142)  G(143)  G(154)  G(154)
)
OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(initSubLookup,
        G(218)  G(219)  G(221)  G(222)  G(229),
        G(27)   G(30)   G(128)  G(131)  G(144)
)
OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(mediSubLookup,
        G(218)  G(219)  G(221)  G(222)  G(229),
        G(28)   G(31)   G(129)  G(138)  G(149)
)
OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(finaSubLookup,
        G(194)  G(195)  G(197)  G(198)  G(199)  G(201)  G(204)  G(205)  G(206)
        G(218)  G(219)  G(229)  G(236)  G(237),
        G(2)    G(1)    G(3)    G(181)  G(0)    G(159)  G(8)    G(10)   G(12)
        G(29)   G(127)  G(152) G(160)   G(156)
)
OT_SUBLOOKUP_SINGLE_SUBST_FORMAT2(medifinaLamAlefSubLookup,
        G(165)  G(178)  G(180)  G(252),
        G(170)  G(179)  G(185)  G(255)
)

/*
 * Lam+Alef ligatures
 */
OT_SUBLOOKUP_LIGATURE_SUBST_FORMAT1(lamAlefLigaturesSubLookup,
        G(225),
        OT_OFFSET(lamAlefLigaturesSubLookup, lamLigatureSet)
)
OT_LIGATURE_SET(lamLigatureSet,
        OT_OFFSET(lamLigatureSet, lamInitLigature1)
        OT_OFFSET(lamLigatureSet, lamInitLigature2)
        OT_OFFSET(lamLigatureSet, lamInitLigature3)
        OT_OFFSET(lamLigatureSet, lamInitLigature4)
)
OT_LIGATURE(lamInitLigature1, G(199), G(165))
OT_LIGATURE(lamInitLigature2, G(195), G(178))
OT_LIGATURE(lamInitLigature3, G(194), G(180))

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