Initial import from the monolithic Qt.

This is the beginning of revision history for this module. If you
want to look at revision history older than this, please refer to the
Qt Git wiki for how to use Git history grafting. At the time of
writing, this wiki is located here:

http://qt.gitorious.org/qt/pages/GitIntroductionWithQt

If you have already performed the grafting and you don't see any
history beyond this commit, try running "git log" with the "--follow"
argument.

Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 274 insertions, 0 deletions

diff --git a/src/3rdparty/harfbuzz/src/harfbuzz-tibetan.c b/src/3rdparty/harfbuzz/src/harfbuzz-tibetan.c
new file mode 100644
index 0000000000..bfa31b1def
--- /dev/null
+++ b/src/3rdparty/harfbuzz/src/harfbuzz-tibetan.c
@@ -0,0 +1,274 @@
+/*
+ * 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>
+
+/*
+ tibetan syllables are of the form:
+    head position consonant
+    first sub-joined consonant
+    ....intermediate sub-joined consonants (if any)
+    last sub-joined consonant
+    sub-joined vowel (a-chung U+0F71)
+    standard or compound vowel sign (or 'virama' for devanagari transliteration)
+*/
+
+typedef enum {
+    TibetanOther,
+    TibetanHeadConsonant,
+    TibetanSubjoinedConsonant,
+    TibetanSubjoinedVowel,
+    TibetanVowel
+} TibetanForm;
+
+/* this table starts at U+0f40 */
+static const unsigned char tibetanForm[0x80] = {
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant, TibetanHeadConsonant,
+    TibetanOther, TibetanOther, TibetanOther, TibetanOther,
+
+    TibetanOther, TibetanVowel, TibetanVowel, TibetanVowel,
+    TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
+    TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
+    TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
+
+    TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
+    TibetanVowel, TibetanVowel, TibetanVowel, TibetanVowel,
+    TibetanOther, TibetanOther, TibetanOther, TibetanOther,
+    TibetanOther, TibetanOther, TibetanOther, TibetanOther,
+
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant, TibetanSubjoinedConsonant,
+    TibetanSubjoinedConsonant, TibetanOther, TibetanOther, TibetanOther
+};
+
+
+#define tibetan_form(c) \
+    (TibetanForm)tibetanForm[c - 0x0f40]
+
+static const HB_OpenTypeFeature tibetan_features[] = {
+    { HB_MAKE_TAG('c', 'c', 'm', 'p'), CcmpProperty },
+    { HB_MAKE_TAG('a', 'b', 'v', 's'), AboveSubstProperty },
+    { HB_MAKE_TAG('b', 'l', 'w', 's'), BelowSubstProperty },
+    { HB_MAKE_TAG('c', 'a', 'l', 't'), CaltProperty },
+    {0, 0}
+};
+
+static HB_Bool tibetan_shape_syllable(HB_Bool openType, HB_ShaperItem *item, HB_Bool invalid)
+{
+    hb_uint32 i;
+    const HB_UChar16 *str = item->string + item->item.pos;
+    int len = item->item.length;
+#ifndef NO_OPENTYPE
+    const int availableGlyphs = item->num_glyphs;
+#endif
+    HB_Bool haveGlyphs;
+    HB_STACKARRAY(HB_UChar16, reordered, len + 4);
+
+    if (item->num_glyphs < item->item.length + 4) {
+        item->num_glyphs = item->item.length + 4;
+        return FALSE;
+    }
+
+    if (invalid) {
+        *reordered = 0x25cc;
+        memcpy(reordered+1, str, len*sizeof(HB_UChar16));
+        len++;
+        str = reordered;
+    }
+
+    haveGlyphs = item->font->klass->convertStringToGlyphIndices(item->font,
+                                                                str, len,
+                                                                item->glyphs, &item->num_glyphs,
+                                                                item->item.bidiLevel % 2);
+
+    HB_FREE_STACKARRAY(reordered);
+
+    if (!haveGlyphs)
+        return FALSE;
+
+    for (i = 0; i < item->item.length; i++) {
+        item->attributes[i].mark = FALSE;
+        item->attributes[i].clusterStart = FALSE;
+        item->attributes[i].justification = 0;
+        item->attributes[i].zeroWidth = FALSE;
+/*        IDEBUG("    %d: %4x", i, str[i]); */
+    }
+
+    /* now we have the syllable in the right order, and can start running it through open type. */
+
+#ifndef NO_OPENTYPE
+    if (openType) {
+        HB_OpenTypeShape(item, /*properties*/0);
+        if (!HB_OpenTypePosition(item, availableGlyphs, /*doLogClusters*/FALSE))
+            return FALSE;
+    } else {
+        HB_HeuristicPosition(item);
+    }
+#endif
+
+    item->attributes[0].clusterStart = TRUE;
+    return TRUE;
+}
+
+
+static int tibetan_nextSyllableBoundary(const HB_UChar16 *s, int start, int end, HB_Bool *invalid)
+{
+    const HB_UChar16 *uc = s + start;
+
+    int pos = 0;
+    TibetanForm state = tibetan_form(*uc);
+
+/*     qDebug("state[%d]=%d (uc=%4x)", pos, state, uc[pos]);*/
+    pos++;
+
+    if (state != TibetanHeadConsonant) {
+        if (state != TibetanOther)
+            *invalid = TRUE;
+        goto finish;
+    }
+
+    while (pos < end - start) {
+        TibetanForm newState = tibetan_form(uc[pos]);
+        switch(newState) {
+        case TibetanSubjoinedConsonant:
+        case TibetanSubjoinedVowel:
+            if (state != TibetanHeadConsonant &&
+                 state != TibetanSubjoinedConsonant)
+                goto finish;
+            state = newState;
+            break;
+        case TibetanVowel:
+            if (state != TibetanHeadConsonant &&
+                 state != TibetanSubjoinedConsonant &&
+                 state != TibetanSubjoinedVowel)
+                goto finish;
+            break;
+        case TibetanOther:
+        case TibetanHeadConsonant:
+            goto finish;
+        }
+        pos++;
+    }
+
+finish:
+    *invalid = FALSE;
+    return start+pos;
+}
+
+HB_Bool HB_TibetanShape(HB_ShaperItem *item)
+{
+
+    HB_Bool openType = FALSE;
+    unsigned short *logClusters = item->log_clusters;
+
+    HB_ShaperItem syllable = *item;
+    int first_glyph = 0;
+
+    int sstart = item->item.pos;
+    int end = sstart + item->item.length;
+
+    assert(item->item.script == HB_Script_Tibetan);
+
+#ifndef QT_NO_OPENTYPE
+    openType = HB_SelectScript(item, tibetan_features);
+#endif
+
+    while (sstart < end) {
+        HB_Bool invalid;
+        int i;
+        int send = tibetan_nextSyllableBoundary(item->string, sstart, end, &invalid);
+/*        IDEBUG("syllable from %d, length %d, invalid=%s", sstart, send-sstart,
+                 invalid ? "TRUE" : "FALSE"); */
+        syllable.item.pos = sstart;
+        syllable.item.length = send-sstart;
+        syllable.glyphs = item->glyphs + first_glyph;
+        syllable.attributes = item->attributes + first_glyph;
+        syllable.offsets = item->offsets + first_glyph;
+        syllable.advances = item->advances + first_glyph;
+        syllable.num_glyphs = item->num_glyphs - first_glyph;
+        if (!tibetan_shape_syllable(openType, &syllable, invalid)) {
+            item->num_glyphs += syllable.num_glyphs;
+            return FALSE;
+        }
+        /* fix logcluster array */
+        for (i = sstart; i < send; ++i)
+            logClusters[i-item->item.pos] = first_glyph;
+        sstart = send;
+        first_glyph += syllable.num_glyphs;
+    }
+    item->num_glyphs = first_glyph;
+    return TRUE;
+}
+
+void HB_TibetanAttributes(HB_Script script, const HB_UChar16 *text, hb_uint32 from, hb_uint32 len, HB_CharAttributes *attributes)
+{
+    int end = from + len;
+    const HB_UChar16 *uc = text + from;
+    hb_uint32 i = 0;
+    HB_UNUSED(script);
+    attributes += from;
+    while (i < len) {
+        HB_Bool invalid;
+        hb_uint32 boundary = tibetan_nextSyllableBoundary(text, from+i, end, &invalid) - from;
+
+        attributes[i].charStop = TRUE;
+
+        if (boundary > len-1) boundary = len;
+        i++;
+        while (i < boundary) {
+            attributes[i].charStop = FALSE;
+            ++uc;
+            ++i;
+        }
+        assert(i == boundary);
+    }
+}
+
+