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Branched from the monolithic repo, Qt master branch, at commit
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1 files changed, 1144 insertions, 0 deletions

diff --git a/src/3rdparty/harfbuzz/src/harfbuzz-arabic.c b/src/3rdparty/harfbuzz/src/harfbuzz-arabic.c
new file mode 100644
index 0000000000..3837087f44
--- /dev/null
+++ b/src/3rdparty/harfbuzz/src/harfbuzz-arabic.c
@@ -0,0 +1,1144 @@
+/*
+ * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
+ *
+ * This is part of HarfBuzz, an OpenType Layout engine 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.
+ */
+
+#include "harfbuzz-shaper.h"
+#include "harfbuzz-shaper-private.h"
+
+#include <assert.h>
+
+static const HB_UChar16 ReplacementCharacter = 0xfffd;
+
+typedef struct {
+    unsigned char shape;
+    unsigned char justification;
+} HB_ArabicProperties;
+
+typedef enum {
+    XIsolated,
+    XFinal,
+    XInitial,
+    XMedial,
+    /* intermediate state */
+    XCausing
+} ArabicShape;
+
+/*
+// these groups correspond to the groups defined in the Unicode standard.
+// Some of these groups are equal with regards to both joining and line breaking behaviour,
+// and thus have the same enum value
+//
+// I'm not sure the mapping of syriac to arabic enums is correct with regards to justification, but as
+// I couldn't find any better document I'll hope for the best.
+*/
+typedef enum {
+    /* NonJoining */
+    ArabicNone,
+    ArabicSpace,
+    /* Transparent */
+    Transparent,
+    /* Causing */
+    Center,
+    Kashida,
+
+    /* Arabic */
+    /* Dual */
+    Beh,
+    Noon,
+    Meem = Noon,
+    Heh = Noon,
+    KnottedHeh = Noon,
+    HehGoal = Noon,
+    SwashKaf = Noon,
+    Yeh,
+    Hah,
+    Seen,
+    Sad = Seen,
+    Tah,
+    Kaf = Tah,
+    Gaf = Tah,
+    Lam = Tah,
+    Ain,
+    Feh = Ain,
+    Qaf = Ain,
+    /* Right */
+    Alef,
+    Waw,
+    Dal,
+    TehMarbuta = Dal,
+    Reh,
+    HamzaOnHehGoal,
+    YehWithTail = HamzaOnHehGoal,
+    YehBarre = HamzaOnHehGoal,
+
+    /* Syriac */
+    /* Dual */
+    Beth = Beh,
+    Gamal = Ain,
+    Heth = Noon,
+    Teth = Hah,
+    Yudh = Noon,
+    Kaph = Noon,
+    Lamadh = Lam,
+    Mim = Noon,
+    Nun = Noon,
+    Semakh = Noon,
+    FinalSemakh = Noon,
+    SyriacE = Ain,
+    Pe = Ain,
+    ReversedPe = Hah,
+    Qaph = Noon,
+    Shin = Noon,
+    Fe = Ain,
+
+    /* Right */
+    Alaph = Alef,
+    Dalath = Dal,
+    He = Dal,
+    SyriacWaw = Waw,
+    Zain = Alef,
+    YudhHe = Waw,
+    Sadhe = HamzaOnHehGoal,
+    Taw = Dal,
+
+    /* Compiler bug? Otherwise ArabicGroupsEnd would be equal to Dal + 1. */
+    Dummy = HamzaOnHehGoal,
+    ArabicGroupsEnd
+} ArabicGroup;
+
+static const unsigned char arabic_group[0x150] = {
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    ArabicNone, ArabicNone, Alef, Alef,
+    Waw, Alef, Yeh, Alef,
+    Beh, TehMarbuta, Beh, Beh,
+    Hah, Hah, Hah, Dal,
+
+    Dal, Reh, Reh, Seen,
+    Seen, Sad, Sad, Tah,
+    Tah, Ain, Ain, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    /* 0x640 */
+    Kashida, Feh, Qaf, Kaf,
+    Lam, Meem, Noon, Heh,
+    Waw, Yeh, Yeh, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, Beh, Qaf,
+
+    Transparent, Alef, Alef, Alef,
+    ArabicNone, Alef, Waw, Waw,
+    Yeh, Beh, Beh, Beh,
+    Beh, Beh, Beh, Beh,
+
+    /* 0x680 */
+    Beh, Hah, Hah, Hah,
+    Hah, Hah, Hah, Hah,
+    Dal, Dal, Dal, Dal,
+    Dal, Dal, Dal, Dal,
+
+    Dal, Reh, Reh, Reh,
+    Reh, Reh, Reh, Reh,
+    Reh, Reh, Seen, Seen,
+    Seen, Sad, Sad, Tah,
+
+    Ain, Feh, Feh, Feh,
+    Feh, Feh, Feh, Qaf,
+    Qaf, Gaf, SwashKaf, Gaf,
+    Kaf, Kaf, Kaf, Gaf,
+
+    Gaf, Gaf, Gaf, Gaf,
+    Gaf, Lam, Lam, Lam,
+    Lam, Noon, Noon, Noon,
+    Noon, Noon, KnottedHeh, Hah,
+
+    /* 0x6c0 */
+    TehMarbuta, HehGoal, HamzaOnHehGoal, HamzaOnHehGoal,
+    Waw, Waw, Waw, Waw,
+    Waw, Waw, Waw, Waw,
+    Yeh, YehWithTail, Yeh, Waw,
+
+    Yeh, Yeh, YehBarre, YehBarre,
+    ArabicNone, TehMarbuta, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, ArabicNone, ArabicNone, Transparent,
+    Transparent, ArabicNone, Transparent, Transparent,
+    Transparent, Transparent, Dal, Reh,
+
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, Seen, Sad,
+    Ain, ArabicNone, ArabicNone, KnottedHeh,
+
+    /* 0x700 */
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+    ArabicNone, ArabicNone, ArabicNone, ArabicNone,
+
+    Alaph, Transparent, Beth, Gamal,
+    Gamal, Dalath, Dalath, He,
+    SyriacWaw, Zain, Heth, Teth,
+    Teth, Yudh, YudhHe, Kaph,
+
+    Lamadh, Mim, Nun, Semakh,
+    FinalSemakh, SyriacE, Pe, ReversedPe,
+    Sadhe, Qaph, Dalath, Shin,
+    Taw, Beth, Gamal, Dalath,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, Transparent,
+    Transparent, Transparent, Transparent, ArabicNone,
+    ArabicNone, Zain, Kaph, Fe,
+};
+
+static ArabicGroup arabicGroup(unsigned short uc)
+{
+    if (uc >= 0x0600 && uc < 0x750)
+        return (ArabicGroup) arabic_group[uc-0x600];
+    else if (uc == 0x200d)
+        return Center;
+    else if (HB_GetUnicodeCharCategory(uc) == HB_Separator_Space)
+        return ArabicSpace;
+    else
+        return ArabicNone;
+}
+
+
+/*
+   Arabic shaping obeys a number of rules according to the joining classes (see Unicode book, section on
+   arabic).
+
+   Each unicode char has a joining class (right, dual (left&right), center (joincausing) or transparent).
+   transparent joining is not encoded in HB_UChar16::joining(), but applies to all combining marks and format marks.
+
+   Right join-causing: dual + center
+   Left join-causing: dual + right + center
+
+   Rules are as follows (for a string already in visual order, as we have it here):
+
+   R1 Transparent characters do not affect joining behaviour.
+   R2 A right joining character, that has a right join-causing char on the right will get form XRight
+   (R3 A left joining character, that has a left join-causing char on the left will get form XLeft)
+   Note: the above rule is meaningless, as there are no pure left joining characters defined in Unicode
+   R4 A dual joining character, that has a left join-causing char on the left and a right join-causing char on
+             the right will get form XMedial
+   R5  A dual joining character, that has a right join causing char on the right, and no left join causing char on the left
+         will get form XRight
+   R6 A dual joining character, that has a  left join causing char on the left, and no right join causing char on the right
+         will get form XLeft
+   R7 Otherwise the character will get form XIsolated
+
+   Additionally we have to do the minimal ligature support for lam-alef ligatures:
+
+   L1 Transparent characters do not affect ligature behaviour.
+   L2 Any sequence of Alef(XRight) + Lam(XMedial) will form the ligature Alef.Lam(XLeft)
+   L3 Any sequence of Alef(XRight) + Lam(XLeft) will form the ligature Alef.Lam(XIsolated)
+
+   The state table below handles rules R1-R7.
+*/
+
+typedef enum {
+    JNone,
+    JCausing,
+    JDual,
+    JRight,
+    JTransparent
+} Joining;
+
+static const Joining joining_for_group[ArabicGroupsEnd] = {
+    /* NonJoining */
+    JNone, /* ArabicNone */
+    JNone, /* ArabicSpace */
+    /* Transparent */
+    JTransparent, /* Transparent */
+    /* Causing */
+    JCausing, /* Center */
+    JCausing, /* Kashida */
+    /* Dual */
+    JDual, /* Beh */
+    JDual, /* Noon */
+    JDual, /* Yeh */
+    JDual, /* Hah */
+    JDual, /* Seen */
+    JDual, /* Tah */
+    JDual, /* Ain */
+    /* Right */
+    JRight, /* Alef */
+    JRight, /* Waw */
+    JRight, /* Dal */
+    JRight, /* Reh */
+    JRight  /* HamzaOnHehGoal */
+};
+
+
+typedef struct {
+    ArabicShape form1;
+    ArabicShape form2;
+} JoiningPair;
+
+static const JoiningPair joining_table[5][4] =
+/* None, Causing, Dual, Right */
+{
+    { { XIsolated, XIsolated }, { XIsolated, XCausing }, { XIsolated, XInitial }, { XIsolated, XIsolated } }, /* XIsolated */
+    { { XFinal, XIsolated }, { XFinal, XCausing }, { XFinal, XInitial }, { XFinal, XIsolated } }, /* XFinal */
+    { { XIsolated, XIsolated }, { XInitial, XCausing }, { XInitial, XMedial }, { XInitial, XFinal } }, /* XInitial */
+    { { XFinal, XIsolated }, { XMedial, XCausing }, { XMedial, XMedial }, { XMedial, XFinal } }, /* XMedial */
+    { { XIsolated, XIsolated }, { XIsolated, XCausing }, { XIsolated, XMedial }, { XIsolated, XFinal } }, /* XCausing */
+};
+
+
+/*
+According to http://www.microsoft.com/middleeast/Arabicdev/IE6/KBase.asp
+
+1. Find the priority of the connecting opportunities in each word
+2. Add expansion at the highest priority connection opportunity
+3. If more than one connection opportunity have the same highest value,
+   use the opportunity closest to the end of the word.
+
+Following is a chart that provides the priority for connection
+opportunities and where expansion occurs. The character group names
+are those in table 6.6 of the UNICODE 2.0 book.
+
+
+PrioritY        Glyph                   Condition                                       Kashida Location
+
+Arabic_Kashida        User inserted Kashida   The user entered a Kashida in a position.       After the user
+                (Shift+j or Shift+[E with hat])    Thus, it is the highest priority to insert an   inserted kashida
+                                        automatic kashida.
+
+Arabic_Seen        Seen, Sad               Connecting to the next character.               After the character.
+                                        (Initial or medial form).
+
+Arabic_HaaDal        Teh Marbutah, Haa, Dal  Connecting to previous character.               Before the final form
+                                                                                        of these characters.
+
+Arabic_Alef     Alef, Tah, Lam,         Connecting to previous character.               Before the final form
+                Kaf and Gaf                                                             of these characters.
+
+Arabic_BaRa     Reh, Yeh                Connected to medial Beh                         Before preceding medial Baa
+
+Arabic_Waw        Waw, Ain, Qaf, Feh      Connecting to previous character.               Before the final form of
+                                                                                        these characters.
+
+Arabic_Normal   Other connecting        Connecting to previous character.               Before the final form
+                characters                                                              of these characters.
+
+
+
+This seems to imply that we have at most one kashida point per arabic word.
+
+*/
+
+static void getArabicProperties(const unsigned short *chars, int len, HB_ArabicProperties *properties)
+{
+/*     qDebug("arabicSyriacOpenTypeShape: properties:"); */
+    int lastPos = 0;
+    int lastGroup = ArabicNone;
+    int i = 0;
+
+    ArabicGroup group = arabicGroup(chars[0]);
+    Joining j = joining_for_group[group];
+    ArabicShape shape = joining_table[XIsolated][j].form2;
+    properties[0].justification = HB_NoJustification;
+
+    for (i = 1; i < len; ++i) {
+        /* #### fix handling for spaces and punktuation */
+        properties[i].justification = HB_NoJustification;
+
+        group = arabicGroup(chars[i]);
+        j = joining_for_group[group];
+
+        if (j == JTransparent) {
+            properties[i].shape = XIsolated;
+            continue;
+        }
+
+        properties[lastPos].shape = joining_table[shape][j].form1;
+        shape = joining_table[shape][j].form2;
+
+        switch(lastGroup) {
+        case Seen:
+            if (properties[lastPos].shape == XInitial || properties[lastPos].shape == XMedial)
+                properties[i-1].justification = HB_Arabic_Seen;
+            break;
+        case Hah:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_HaaDal;
+            break;
+        case Alef:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Alef;
+            break;
+        case Ain:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Waw;
+            break;
+        case Noon:
+            if (properties[lastPos].shape == XFinal)
+                properties[lastPos-1].justification = HB_Arabic_Normal;
+            break;
+        case ArabicNone:
+            break;
+
+        default:
+            assert(FALSE);
+        }
+
+        lastGroup = ArabicNone;
+
+        switch(group) {
+        case ArabicNone:
+        case Transparent:
+        /* ### Center should probably be treated as transparent when it comes to justification. */
+        case Center:
+            break;
+        case ArabicSpace:
+            properties[i].justification = HB_Arabic_Space;
+            break;
+        case Kashida:
+            properties[i].justification = HB_Arabic_Kashida;
+            break;
+        case Seen:
+            lastGroup = Seen;
+            break;
+
+        case Hah:
+        case Dal:
+            lastGroup = Hah;
+            break;
+
+        case Alef:
+        case Tah:
+            lastGroup = Alef;
+            break;
+
+        case Yeh:
+        case Reh:
+            if (properties[lastPos].shape == XMedial && arabicGroup(chars[lastPos]) == Beh)
+                properties[lastPos-1].justification = HB_Arabic_BaRa;
+            break;
+
+        case Ain:
+        case Waw:
+            lastGroup = Ain;
+            break;
+
+        case Noon:
+        case Beh:
+        case HamzaOnHehGoal:
+            lastGroup = Noon;
+            break;
+        case ArabicGroupsEnd:
+            assert(FALSE);
+        }
+
+        lastPos = i;
+    }
+    properties[lastPos].shape = joining_table[shape][JNone].form1;
+
+
+    /*
+     for (int i = 0; i < len; ++i)
+         qDebug("arabic properties(%d): uc=%x shape=%d, justification=%d", i, chars[i], properties[i].shape, properties[i].justification);
+    */
+}
+
+static Joining getNkoJoining(unsigned short uc)
+{
+    if (uc < 0x7ca)
+        return JNone;
+    if (uc <= 0x7ea)
+        return JDual;
+    if (uc <= 0x7f3)
+        return JTransparent;
+    if (uc <= 0x7f9)
+        return JNone;
+    if (uc == 0x7fa)
+        return JCausing;
+    return JNone;
+}
+
+static void getNkoProperties(const unsigned short *chars, int len, HB_ArabicProperties *properties)
+{
+    int lastPos = 0;
+    int i = 0;
+
+    Joining j = getNkoJoining(chars[0]);
+    ArabicShape shape = joining_table[XIsolated][j].form2;
+    properties[0].justification = HB_NoJustification;
+
+    for (i = 1; i < len; ++i) {
+        properties[i].justification = (HB_GetUnicodeCharCategory(chars[i]) == HB_Separator_Space) ?
+                                      ArabicSpace : ArabicNone;
+
+        j = getNkoJoining(chars[i]);
+
+        if (j == JTransparent) {
+            properties[i].shape = XIsolated;
+            continue;
+        }
+
+        properties[lastPos].shape = joining_table[shape][j].form1;
+        shape = joining_table[shape][j].form2;
+
+
+        lastPos = i;
+    }
+    properties[lastPos].shape = joining_table[shape][JNone].form1;
+
+
+    /*
+     for (int i = 0; i < len; ++i)
+         qDebug("nko properties(%d): uc=%x shape=%d, justification=%d", i, chars[i], properties[i].shape, properties[i].justification);
+    */
+}
+
+/*
+// The unicode to unicode shaping codec.
+// does only presentation forms B at the moment, but that should be enough for
+// simple display
+*/
+static const hb_uint16 arabicUnicodeMapping[256][2] = {
+    /* base of shaped forms, and number-1 of them (0 for non shaping,
+       1 for right binding and 3 for dual binding */
+
+    /* These are just the glyphs available in Unicode,
+       some characters are in R class, but have no glyphs in Unicode. */
+
+    { 0x0600, 0 }, /* 0x0600 */
+    { 0x0601, 0 }, /* 0x0601 */
+    { 0x0602, 0 }, /* 0x0602 */
+    { 0x0603, 0 }, /* 0x0603 */
+    { 0x0604, 0 }, /* 0x0604 */
+    { 0x0605, 0 }, /* 0x0605 */
+    { 0x0606, 0 }, /* 0x0606 */
+    { 0x0607, 0 }, /* 0x0607 */
+    { 0x0608, 0 }, /* 0x0608 */
+    { 0x0609, 0 }, /* 0x0609 */
+    { 0x060A, 0 }, /* 0x060A */
+    { 0x060B, 0 }, /* 0x060B */
+    { 0x060C, 0 }, /* 0x060C */
+    { 0x060D, 0 }, /* 0x060D */
+    { 0x060E, 0 }, /* 0x060E */
+    { 0x060F, 0 }, /* 0x060F */
+
+    { 0x0610, 0 }, /* 0x0610 */
+    { 0x0611, 0 }, /* 0x0611 */
+    { 0x0612, 0 }, /* 0x0612 */
+    { 0x0613, 0 }, /* 0x0613 */
+    { 0x0614, 0 }, /* 0x0614 */
+    { 0x0615, 0 }, /* 0x0615 */
+    { 0x0616, 0 }, /* 0x0616 */
+    { 0x0617, 0 }, /* 0x0617 */
+    { 0x0618, 0 }, /* 0x0618 */
+    { 0x0619, 0 }, /* 0x0619 */
+    { 0x061A, 0 }, /* 0x061A */
+    { 0x061B, 0 }, /* 0x061B */
+    { 0x061C, 0 }, /* 0x061C */
+    { 0x061D, 0 }, /* 0x061D */
+    { 0x061E, 0 }, /* 0x061E */
+    { 0x061F, 0 }, /* 0x061F */
+
+    { 0x0620, 0 }, /* 0x0620 */
+    { 0xFE80, 0 }, /* 0x0621            HAMZA */
+    { 0xFE81, 1 }, /* 0x0622    R       ALEF WITH MADDA ABOVE */
+    { 0xFE83, 1 }, /* 0x0623    R       ALEF WITH HAMZA ABOVE */
+    { 0xFE85, 1 }, /* 0x0624    R       WAW WITH HAMZA ABOVE */
+    { 0xFE87, 1 }, /* 0x0625    R       ALEF WITH HAMZA BELOW */
+    { 0xFE89, 3 }, /* 0x0626    D       YEH WITH HAMZA ABOVE */
+    { 0xFE8D, 1 }, /* 0x0627    R       ALEF */
+    { 0xFE8F, 3 }, /* 0x0628    D       BEH */
+    { 0xFE93, 1 }, /* 0x0629    R       TEH MARBUTA */
+    { 0xFE95, 3 }, /* 0x062A    D       TEH */
+    { 0xFE99, 3 }, /* 0x062B    D       THEH */
+    { 0xFE9D, 3 }, /* 0x062C    D       JEEM */
+    { 0xFEA1, 3 }, /* 0x062D    D       HAH */
+    { 0xFEA5, 3 }, /* 0x062E    D       KHAH */
+    { 0xFEA9, 1 }, /* 0x062F    R       DAL */
+
+    { 0xFEAB, 1 }, /* 0x0630    R       THAL */
+    { 0xFEAD, 1 }, /* 0x0631    R       REH */
+    { 0xFEAF, 1 }, /* 0x0632    R       ZAIN */
+    { 0xFEB1, 3 }, /* 0x0633    D       SEEN */
+    { 0xFEB5, 3 }, /* 0x0634    D       SHEEN */
+    { 0xFEB9, 3 }, /* 0x0635    D       SAD */
+    { 0xFEBD, 3 }, /* 0x0636    D       DAD */
+    { 0xFEC1, 3 }, /* 0x0637    D       TAH */
+    { 0xFEC5, 3 }, /* 0x0638    D       ZAH */
+    { 0xFEC9, 3 }, /* 0x0639    D       AIN */
+    { 0xFECD, 3 }, /* 0x063A    D       GHAIN */
+    { 0x063B, 0 }, /* 0x063B */
+    { 0x063C, 0 }, /* 0x063C */
+    { 0x063D, 0 }, /* 0x063D */
+    { 0x063E, 0 }, /* 0x063E */
+    { 0x063F, 0 }, /* 0x063F */
+
+    { 0x0640, 0 }, /* 0x0640    C       TATWEEL // ### Join Causing, only one glyph */
+    { 0xFED1, 3 }, /* 0x0641    D       FEH */
+    { 0xFED5, 3 }, /* 0x0642    D       QAF */
+    { 0xFED9, 3 }, /* 0x0643    D       KAF */
+    { 0xFEDD, 3 }, /* 0x0644    D       LAM */
+    { 0xFEE1, 3 }, /* 0x0645    D       MEEM */
+    { 0xFEE5, 3 }, /* 0x0646    D       NOON */
+    { 0xFEE9, 3 }, /* 0x0647    D       HEH */
+    { 0xFEED, 1 }, /* 0x0648    R       WAW */
+    { 0x0649, 3 }, /* 0x0649            ALEF MAKSURA // ### Dual, glyphs not consecutive, handle in code. */
+    { 0xFEF1, 3 }, /* 0x064A    D       YEH */
+    { 0x064B, 0 }, /* 0x064B */
+    { 0x064C, 0 }, /* 0x064C */
+    { 0x064D, 0 }, /* 0x064D */
+    { 0x064E, 0 }, /* 0x064E */
+    { 0x064F, 0 }, /* 0x064F */
+
+    { 0x0650, 0 }, /* 0x0650 */
+    { 0x0651, 0 }, /* 0x0651 */
+    { 0x0652, 0 }, /* 0x0652 */
+    { 0x0653, 0 }, /* 0x0653 */
+    { 0x0654, 0 }, /* 0x0654 */
+    { 0x0655, 0 }, /* 0x0655 */
+    { 0x0656, 0 }, /* 0x0656 */
+    { 0x0657, 0 }, /* 0x0657 */
+    { 0x0658, 0 }, /* 0x0658 */
+    { 0x0659, 0 }, /* 0x0659 */
+    { 0x065A, 0 }, /* 0x065A */
+    { 0x065B, 0 }, /* 0x065B */
+    { 0x065C, 0 }, /* 0x065C */
+    { 0x065D, 0 }, /* 0x065D */
+    { 0x065E, 0 }, /* 0x065E */
+    { 0x065F, 0 }, /* 0x065F */
+
+    { 0x0660, 0 }, /* 0x0660 */
+    { 0x0661, 0 }, /* 0x0661 */
+    { 0x0662, 0 }, /* 0x0662 */
+    { 0x0663, 0 }, /* 0x0663 */
+    { 0x0664, 0 }, /* 0x0664 */
+    { 0x0665, 0 }, /* 0x0665 */
+    { 0x0666, 0 }, /* 0x0666 */
+    { 0x0667, 0 }, /* 0x0667 */
+    { 0x0668, 0 }, /* 0x0668 */
+    { 0x0669, 0 }, /* 0x0669 */
+    { 0x066A, 0 }, /* 0x066A */
+    { 0x066B, 0 }, /* 0x066B */
+    { 0x066C, 0 }, /* 0x066C */
+    { 0x066D, 0 }, /* 0x066D */
+    { 0x066E, 0 }, /* 0x066E */
+    { 0x066F, 0 }, /* 0x066F */
+
+    { 0x0670, 0 }, /* 0x0670 */
+    { 0xFB50, 1 }, /* 0x0671    R       ALEF WASLA */
+    { 0x0672, 0 }, /* 0x0672 */
+    { 0x0673, 0 }, /* 0x0673 */
+    { 0x0674, 0 }, /* 0x0674 */
+    { 0x0675, 0 }, /* 0x0675 */
+    { 0x0676, 0 }, /* 0x0676 */
+    { 0x0677, 0 }, /* 0x0677 */
+    { 0x0678, 0 }, /* 0x0678 */
+    { 0xFB66, 3 }, /* 0x0679    D       TTEH */
+    { 0xFB5E, 3 }, /* 0x067A    D       TTEHEH */
+    { 0xFB52, 3 }, /* 0x067B    D       BEEH */
+    { 0x067C, 0 }, /* 0x067C */
+    { 0x067D, 0 }, /* 0x067D */
+    { 0xFB56, 3 }, /* 0x067E    D       PEH */
+    { 0xFB62, 3 }, /* 0x067F    D       TEHEH */
+
+    { 0xFB5A, 3 }, /* 0x0680    D       BEHEH */
+    { 0x0681, 0 }, /* 0x0681 */
+    { 0x0682, 0 }, /* 0x0682 */
+    { 0xFB76, 3 }, /* 0x0683    D       NYEH */
+    { 0xFB72, 3 }, /* 0x0684    D       DYEH */
+    { 0x0685, 0 }, /* 0x0685 */
+    { 0xFB7A, 3 }, /* 0x0686    D       TCHEH */
+    { 0xFB7E, 3 }, /* 0x0687    D       TCHEHEH */
+    { 0xFB88, 1 }, /* 0x0688    R       DDAL */
+    { 0x0689, 0 }, /* 0x0689 */
+    { 0x068A, 0 }, /* 0x068A */
+    { 0x068B, 0 }, /* 0x068B */
+    { 0xFB84, 1 }, /* 0x068C    R       DAHAL */
+    { 0xFB82, 1 }, /* 0x068D    R       DDAHAL */
+    { 0xFB86, 1 }, /* 0x068E    R       DUL */
+    { 0x068F, 0 }, /* 0x068F */
+
+    { 0x0690, 0 }, /* 0x0690 */
+    { 0xFB8C, 1 }, /* 0x0691    R       RREH */
+    { 0x0692, 0 }, /* 0x0692 */
+    { 0x0693, 0 }, /* 0x0693 */
+    { 0x0694, 0 }, /* 0x0694 */
+    { 0x0695, 0 }, /* 0x0695 */
+    { 0x0696, 0 }, /* 0x0696 */
+    { 0x0697, 0 }, /* 0x0697 */
+    { 0xFB8A, 1 }, /* 0x0698    R       JEH */
+    { 0x0699, 0 }, /* 0x0699 */
+    { 0x069A, 0 }, /* 0x069A */
+    { 0x069B, 0 }, /* 0x069B */
+    { 0x069C, 0 }, /* 0x069C */
+    { 0x069D, 0 }, /* 0x069D */
+    { 0x069E, 0 }, /* 0x069E */
+    { 0x069F, 0 }, /* 0x069F */
+
+    { 0x06A0, 0 }, /* 0x06A0 */
+    { 0x06A1, 0 }, /* 0x06A1 */
+    { 0x06A2, 0 }, /* 0x06A2 */
+    { 0x06A3, 0 }, /* 0x06A3 */
+    { 0xFB6A, 3 }, /* 0x06A4    D       VEH */
+    { 0x06A5, 0 }, /* 0x06A5 */
+    { 0xFB6E, 3 }, /* 0x06A6    D       PEHEH */
+    { 0x06A7, 0 }, /* 0x06A7 */
+    { 0x06A8, 0 }, /* 0x06A8 */
+    { 0xFB8E, 3 }, /* 0x06A9    D       KEHEH */
+    { 0x06AA, 0 }, /* 0x06AA */
+    { 0x06AB, 0 }, /* 0x06AB */
+    { 0x06AC, 0 }, /* 0x06AC */
+    { 0xFBD3, 3 }, /* 0x06AD    D       NG */
+    { 0x06AE, 0 }, /* 0x06AE */
+    { 0xFB92, 3 }, /* 0x06AF    D       GAF */
+
+    { 0x06B0, 0 }, /* 0x06B0 */
+    { 0xFB9A, 3 }, /* 0x06B1    D       NGOEH */
+    { 0x06B2, 0 }, /* 0x06B2 */
+    { 0xFB96, 3 }, /* 0x06B3    D       GUEH */
+    { 0x06B4, 0 }, /* 0x06B4 */
+    { 0x06B5, 0 }, /* 0x06B5 */
+    { 0x06B6, 0 }, /* 0x06B6 */
+    { 0x06B7, 0 }, /* 0x06B7 */
+    { 0x06B8, 0 }, /* 0x06B8 */
+    { 0x06B9, 0 }, /* 0x06B9 */
+    { 0xFB9E, 1 }, /* 0x06BA    R       NOON GHUNNA */
+    { 0xFBA0, 3 }, /* 0x06BB    D       RNOON */
+    { 0x06BC, 0 }, /* 0x06BC */
+    { 0x06BD, 0 }, /* 0x06BD */
+    { 0xFBAA, 3 }, /* 0x06BE    D       HEH DOACHASHMEE */
+    { 0x06BF, 0 }, /* 0x06BF */
+
+    { 0xFBA4, 1 }, /* 0x06C0    R       HEH WITH YEH ABOVE */
+    { 0xFBA6, 3 }, /* 0x06C1    D       HEH GOAL */
+    { 0x06C2, 0 }, /* 0x06C2 */
+    { 0x06C3, 0 }, /* 0x06C3 */
+    { 0x06C4, 0 }, /* 0x06C4 */
+    { 0xFBE0, 1 }, /* 0x06C5    R       KIRGHIZ OE */
+    { 0xFBD9, 1 }, /* 0x06C6    R       OE */
+    { 0xFBD7, 1 }, /* 0x06C7    R       U */
+    { 0xFBDB, 1 }, /* 0x06C8    R       YU */
+    { 0xFBE2, 1 }, /* 0x06C9    R       KIRGHIZ YU */
+    { 0x06CA, 0 }, /* 0x06CA */
+    { 0xFBDE, 1 }, /* 0x06CB    R       VE */
+    { 0xFBFC, 3 }, /* 0x06CC    D       FARSI YEH */
+    { 0x06CD, 0 }, /* 0x06CD */
+    { 0x06CE, 0 }, /* 0x06CE */
+    { 0x06CF, 0 }, /* 0x06CF */
+
+    { 0xFBE4, 3 }, /* 0x06D0    D       E */
+    { 0x06D1, 0 }, /* 0x06D1 */
+    { 0xFBAE, 1 }, /* 0x06D2    R       YEH BARREE */
+    { 0xFBB0, 1 }, /* 0x06D3    R       YEH BARREE WITH HAMZA ABOVE */
+    { 0x06D4, 0 }, /* 0x06D4 */
+    { 0x06D5, 0 }, /* 0x06D5 */
+    { 0x06D6, 0 }, /* 0x06D6 */
+    { 0x06D7, 0 }, /* 0x06D7 */
+    { 0x06D8, 0 }, /* 0x06D8 */
+    { 0x06D9, 0 }, /* 0x06D9 */
+    { 0x06DA, 0 }, /* 0x06DA */
+    { 0x06DB, 0 }, /* 0x06DB */
+    { 0x06DC, 0 }, /* 0x06DC */
+    { 0x06DD, 0 }, /* 0x06DD */
+    { 0x06DE, 0 }, /* 0x06DE */
+    { 0x06DF, 0 }, /* 0x06DF */
+
+    { 0x06E0, 0 }, /* 0x06E0 */
+    { 0x06E1, 0 }, /* 0x06E1 */
+    { 0x06E2, 0 }, /* 0x06E2 */
+    { 0x06E3, 0 }, /* 0x06E3 */
+    { 0x06E4, 0 }, /* 0x06E4 */
+    { 0x06E5, 0 }, /* 0x06E5 */
+    { 0x06E6, 0 }, /* 0x06E6 */
+    { 0x06E7, 0 }, /* 0x06E7 */
+    { 0x06E8, 0 }, /* 0x06E8 */
+    { 0x06E9, 0 }, /* 0x06E9 */
+    { 0x06EA, 0 }, /* 0x06EA */
+    { 0x06EB, 0 }, /* 0x06EB */
+    { 0x06EC, 0 }, /* 0x06EC */
+    { 0x06ED, 0 }, /* 0x06ED */
+    { 0x06EE, 0 }, /* 0x06EE */
+    { 0x06EF, 0 }, /* 0x06EF */
+
+    { 0x06F0, 0 }, /* 0x06F0 */
+    { 0x06F1, 0 }, /* 0x06F1 */
+    { 0x06F2, 0 }, /* 0x06F2 */
+    { 0x06F3, 0 }, /* 0x06F3 */
+    { 0x06F4, 0 }, /* 0x06F4 */
+    { 0x06F5, 0 }, /* 0x06F5 */
+    { 0x06F6, 0 }, /* 0x06F6 */
+    { 0x06F7, 0 }, /* 0x06F7 */
+    { 0x06F8, 0 }, /* 0x06F8 */
+    { 0x06F9, 0 }, /* 0x06F9 */
+    { 0x06FA, 0 }, /* 0x06FA */
+    { 0x06FB, 0 }, /* 0x06FB */
+    { 0x06FC, 0 }, /* 0x06FC */
+    { 0x06FD, 0 }, /* 0x06FD */
+    { 0x06FE, 0 }, /* 0x06FE */
+    { 0x06FF, 0 }  /* 0x06FF */
+};
+
+/* the arabicUnicodeMapping does not work for U+0649 ALEF MAKSURA, this table does */
+static const hb_uint16 alefMaksura[4] = {0xFEEF, 0xFEF0, 0xFBE8, 0xFBE9};
+
+/*
+// this is a bit tricky. Alef always binds to the right, so the second parameter descibing the shape
+// of the lam can be either initial of medial. So initial maps to the isolated form of the ligature,
+// medial to the final form
+*/
+static const hb_uint16 arabicUnicodeLamAlefMapping[6][4] = {
+    { 0xfffd, 0xfffd, 0xfef5, 0xfef6 }, /* 0x622        R       Alef with Madda above */
+    { 0xfffd, 0xfffd, 0xfef7, 0xfef8 }, /* 0x623        R       Alef with Hamza above */
+    { 0xfffd, 0xfffd, 0xfffd, 0xfffd }, /* 0x624        // Just to fill the table ;-) */
+    { 0xfffd, 0xfffd, 0xfef9, 0xfefa }, /* 0x625        R       Alef with Hamza below */
+    { 0xfffd, 0xfffd, 0xfffd, 0xfffd }, /* 0x626        // Just to fill the table ;-) */
+    { 0xfffd, 0xfffd, 0xfefb, 0xfefc }  /* 0x627        R       Alef */
+};
+
+static int getShape(hb_uint8 cell, int shape)
+{
+    /* the arabicUnicodeMapping does not work for U+0649 ALEF MAKSURA, handle this here */
+    int ch = (cell != 0x49)
+              ? (shape ? arabicUnicodeMapping[cell][0] + shape : 0x600+cell)
+              : alefMaksura[shape] ;
+    return ch;
+}
+
+
+/*
+  Two small helper functions for arabic shaping.
+*/
+static HB_UChar16 prevChar(const HB_UChar16 *str, int pos)
+{
+    /*qDebug("leftChar: pos=%d", pos); */
+    const HB_UChar16 *ch = str + pos - 1;
+    pos--;
+    while(pos > -1) {
+        if(HB_GetUnicodeCharCategory(*ch) != HB_Mark_NonSpacing)
+            return *ch;
+        pos--;
+        ch--;
+    }
+    return ReplacementCharacter;
+}
+
+static HB_UChar16 nextChar(const HB_UChar16 *str, hb_uint32 len, hb_uint32 pos)
+{
+    const HB_UChar16 *ch = str + pos + 1;
+    pos++;
+    while(pos < len) {
+        /*qDebug("rightChar: %d isLetter=%d, joining=%d", pos, ch.isLetter(), ch.joining()); */
+        if(HB_GetUnicodeCharCategory(*ch) != HB_Mark_NonSpacing)
+            return *ch;
+        /* assume it's a transparent char, this might not be 100% correct */
+        pos++;
+        ch++;
+    }
+    return ReplacementCharacter;
+}
+
+static void shapedString(const HB_UChar16 *uc, hb_uint32 stringLength, hb_uint32 from, hb_uint32 len, HB_UChar16 *shapeBuffer, int *shapedLength,
+                         HB_Bool reverse, HB_GlyphAttributes *attributes, unsigned short *logClusters)
+{
+    HB_ArabicProperties *properties;
+    hb_int32 f = from;
+    hb_uint32 l = len;
+    const HB_UChar16 *ch;
+    HB_UChar16 *data;
+    int clusterStart;
+    hb_uint32 i;
+    HB_STACKARRAY(HB_ArabicProperties, props, len + 2);
+    properties = props;
+
+    assert(stringLength >= from + len);
+
+    if(len == 0) {
+        *shapedLength = 0;
+        return;
+    }
+
+    if (from > 0) {
+        --f;
+        ++l;
+        ++properties;
+    }
+    if (f + l < stringLength)
+        ++l;
+    getArabicProperties(uc+f, l, props);
+
+    ch = uc + from;
+    data = shapeBuffer;
+    clusterStart = 0;
+
+    for (i = 0; i < len; i++) {
+        hb_uint8 r = *ch >> 8;
+        int gpos = data - shapeBuffer;
+
+        if (r != 0x06) {
+            if (r == 0x20) {
+                if (*ch == 0x200c || *ch == 0x200d)
+                    /* remove ZWJ and ZWNJ */
+                    goto skip;
+            }
+            if (reverse)
+                *data = HB_GetMirroredChar(*ch);
+            else
+                *data = *ch;
+        } else {
+            hb_uint8 c = *ch & 0xff;
+            int pos = i + from;
+            int shape = properties[i].shape;
+/*            qDebug("mapping U+%x to shape %d glyph=0x%x", ch->unicode(), shape, getShape(c, shape)); */
+            /* take care of lam-alef ligatures (lam right of alef) */
+            hb_uint16 map;
+            switch (c) {
+                case 0x44: { /* lam */
+                    const HB_UChar16 pch = nextChar(uc, stringLength, pos);
+                    if ((pch >> 8) == 0x06) {
+                        switch (pch & 0xff) {
+                            case 0x22:
+                            case 0x23:
+                            case 0x25:
+                            case 0x27:
+/*                                 qDebug(" lam of lam-alef ligature"); */
+                                map = arabicUnicodeLamAlefMapping[(pch & 0xff) - 0x22][shape];
+                                goto next;
+                            default:
+                                break;
+                        }
+                    }
+                    break;
+                }
+                case 0x22: /* alef with madda */
+                case 0x23: /* alef with hamza above */
+                case 0x25: /* alef with hamza below */
+                case 0x27: /* alef */
+                    if (prevChar(uc, pos) == 0x0644) {
+                        /* have a lam alef ligature */
+                        /*qDebug(" alef of lam-alef ligature"); */
+                        goto skip;
+                    }
+                default:
+                    break;
+            }
+            map = getShape(c, shape);
+        next:
+            *data = map;
+        }
+        /* ##### Fixme */
+        /*glyphs[gpos].attributes.zeroWidth = zeroWidth; */
+        if (HB_GetUnicodeCharCategory(*ch) == HB_Mark_NonSpacing) {
+            attributes[gpos].mark = TRUE;
+/*             qDebug("glyph %d (char %d) is mark!", gpos, i); */
+        } else {
+            attributes[gpos].mark = FALSE;
+            clusterStart = data - shapeBuffer;
+        }
+        attributes[gpos].clusterStart = !attributes[gpos].mark;
+        attributes[gpos].combiningClass = HB_GetUnicodeCharCombiningClass(*ch);
+        attributes[gpos].justification = properties[i].justification;
+/*         qDebug("data[%d] = %x (from %x)", gpos, (uint)data->unicode(), ch->unicode());*/
+        data++;
+    skip:
+        ch++;
+        logClusters[i] = clusterStart;
+    }
+    *shapedLength = data - shapeBuffer;
+
+    HB_FREE_STACKARRAY(props);
+}
+
+#ifndef NO_OPENTYPE
+
+static const HB_OpenTypeFeature arabic_features[] = {
+    { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty },
+    { HB_MAKE_TAG('i', 's', 'o', 'l'), IsolProperty },
+    { HB_MAKE_TAG('f', 'i', 'n', 'a'), FinaProperty },
+    { HB_MAKE_TAG('m', 'e', 'd', 'i'), MediProperty },
+    { HB_MAKE_TAG('i', 'n', 'i', 't'), InitProperty },
+    { HB_MAKE_TAG('r', 'l', 'i', 'g'), RligProperty },
+    { HB_MAKE_TAG('c', 'a', 'l', 't'), CaltProperty },
+    { HB_MAKE_TAG('l', 'i', 'g', 'a'), LigaProperty },
+    { HB_MAKE_TAG('d', 'l', 'i', 'g'), DligProperty },
+    { HB_MAKE_TAG('c', 's', 'w', 'h'), CswhProperty },
+    /* mset is used in old Win95 fonts that don't have a 'mark' positioning table. */
+    { HB_MAKE_TAG('m', 's', 'e', 't'), MsetProperty },
+    {0, 0}
+};
+
+static const HB_OpenTypeFeature syriac_features[] = {
+    { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty },
+    { HB_MAKE_TAG('i', 's', 'o', 'l'), IsolProperty },
+    { HB_MAKE_TAG('f', 'i', 'n', 'a'), FinaProperty },
+    { HB_MAKE_TAG('f', 'i', 'n', '2'), FinaProperty },
+    { HB_MAKE_TAG('f', 'i', 'n', '3'), FinaProperty },
+    { HB_MAKE_TAG('m', 'e', 'd', 'i'), MediProperty },
+    { HB_MAKE_TAG('m', 'e', 'd', '2'), MediProperty },
+    { HB_MAKE_TAG('i', 'n', 'i', 't'), InitProperty },
+    { HB_MAKE_TAG('r', 'l', 'i', 'g'), RligProperty },
+    { HB_MAKE_TAG('c', 'a', 'l', 't'), CaltProperty },
+    { HB_MAKE_TAG('l', 'i', 'g', 'a'), LigaProperty },
+    { HB_MAKE_TAG('d', 'l', 'i', 'g'), DligProperty },
+    {0, 0}
+};
+
+static HB_Bool arabicSyriacOpenTypeShape(HB_ShaperItem *item, HB_Bool *ot_ok)
+{
+    const HB_UChar16 *uc;
+    const int nglyphs = item->num_glyphs;
+    hb_int32 f;
+    hb_uint32 l;
+    HB_ArabicProperties *properties;
+    HB_DECLARE_STACKARRAY(HB_ArabicProperties, props)
+    HB_DECLARE_STACKARRAY(hb_uint32, apply)
+    HB_Bool shaped;
+    int i = 0;
+
+    *ot_ok = TRUE;
+
+    if (!HB_ConvertStringToGlyphIndices(item))
+        return FALSE;
+    HB_HeuristicSetGlyphAttributes(item);
+
+    HB_INIT_STACKARRAY(HB_ArabicProperties, props, item->item.length + 2);
+    HB_INIT_STACKARRAY(hb_uint32, apply, item->num_glyphs);
+
+    uc = item->string + item->item.pos;
+
+    properties = props;
+    f = 0;
+    l = item->item.length;
+    if (item->item.pos > 0) {
+        --f;
+        ++l;
+        ++properties;
+    }
+    if (f + l + item->item.pos < item->stringLength) {
+        ++l;
+    }
+    if (item->item.script == HB_Script_Nko)
+        getNkoProperties(uc+f, l, props);
+    else
+        getArabicProperties(uc+f, l, props);
+
+    for (i = 0; i < (int)item->num_glyphs; i++) {
+        apply[i] = 0;
+
+        if (properties[i].shape == XIsolated)
+            apply[i] |= MediProperty|FinaProperty|InitProperty;
+        else if (properties[i].shape == XMedial)
+            apply[i] |= IsolProperty|FinaProperty|InitProperty;
+        else if (properties[i].shape == XFinal)
+            apply[i] |= IsolProperty|MediProperty|InitProperty;
+        else if (properties[i].shape == XInitial)
+            apply[i] |= IsolProperty|MediProperty|FinaProperty;
+
+        item->attributes[i].justification = properties[i].justification;
+    }
+
+    HB_FREE_STACKARRAY(props);
+
+    shaped = HB_OpenTypeShape(item, apply);
+
+    HB_FREE_STACKARRAY(apply);
+
+    if (!shaped) {
+        *ot_ok = FALSE;
+        return FALSE;
+    }
+    return HB_OpenTypePosition(item, nglyphs, /*doLogClusters*/TRUE);
+}
+
+#endif
+
+/* #### stil missing: identify invalid character combinations */
+HB_Bool HB_ArabicShape(HB_ShaperItem *item)
+{
+    int slen;
+    HB_Bool haveGlyphs;
+    HB_STACKARRAY(HB_UChar16, shapedChars, item->item.length);
+
+    assert(item->item.script == HB_Script_Arabic || item->item.script == HB_Script_Syriac
+           || item->item.script == HB_Script_Nko);
+
+#ifndef NO_OPENTYPE
+
+    if (HB_SelectScript(item, item->item.script == HB_Script_Arabic ? arabic_features : syriac_features)) {
+        HB_Bool ot_ok;
+        if (arabicSyriacOpenTypeShape(item, &ot_ok))
+            return TRUE;
+        if (ot_ok)
+            return FALSE;
+            /* fall through to the non OT code*/
+    }
+#endif
+
+    if (item->item.script != HB_Script_Arabic)
+        return HB_BasicShape(item);
+
+    shapedString(item->string, item->stringLength, item->item.pos, item->item.length, shapedChars, &slen,
+                  item->item.bidiLevel % 2,
+                  item->attributes, item->log_clusters);
+
+    haveGlyphs = item->font->klass
+        ->convertStringToGlyphIndices(item->font,
+                                      shapedChars, slen,
+                                      item->glyphs, &item->num_glyphs,
+                                      item->item.bidiLevel % 2);
+
+    HB_FREE_STACKARRAY(shapedChars);
+
+    if (!haveGlyphs)
+        return FALSE;
+
+    HB_HeuristicPosition(item);
+    return TRUE;
+}
+
+