Add support for polyphonic greek

Merge patch c0006e05f32ecd6f16825b799d2bce345c166433 from
harfbuzz and add autotests to QTextScriptEngine.

Support for polyphonic greek is implemented by mapping decomposed
greek character sequences to their composed characters in the
greek extended unicode range (U+1f00 - U+1fff).

Task-number: QTBUG-391
Reviewed-By: Simon Hausmann

1 files changed, 75 insertions, 0 deletions

diff --git a/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp b/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
index 6de3f59fdd..841f5b90c7 100644
--- a/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
+++ b/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
@@ -99,6 +99,7 @@ private slots:
     void kannada();
     void malayalam();
     void sinhala();
+    void greek();
 
     void khmer();
     void linearB();
@@ -998,6 +999,80 @@ void tst_QTextScriptEngine::linearB()
 #endif
 }
 
+#if defined(Q_WS_X11)
+static bool decomposedShaping( const QFont &f, const QChar &ch)
+{
+    QString str = QString().append(ch);
+    QTextLayout layout(str, f);
+    QTextEngine *e = layout.d;
+    e->itemize();
+    e->shape(0);
+
+    QTextLayout decomposed(str.normalized(QString::NormalizationForm_D), f);
+    QTextEngine *de = decomposed.d;
+    de->itemize();
+    de->shape(0);
+
+    if( e->layoutData->items[0].num_glyphs != de->layoutData->items[0].num_glyphs )
+        goto error;
+
+    for (int i = 0; i < e->layoutData->items[0].num_glyphs; ++i) {
+        if ((e->layoutData->glyphLayout.glyphs[i] & 0xffffff) != (de->layoutData->glyphLayout.glyphs[i] & 0xffffff))
+            goto error;
+    }
+    return true;
+ error:
+    qDebug("%s: decomposedShaping of char %4x failed, nglyphs=%d, decomposed nglyphs %d",
+           f.family().toLatin1().constData(),
+           ch.unicode(),
+           e->layoutData->items[0].num_glyphs,
+           de->layoutData->items[0].num_glyphs);
+
+    str = "";
+    int i = 0;
+    while (i < e->layoutData->items[0].num_glyphs) {
+        str += QString("%1 ").arg(e->layoutData->glyphLayout.glyphs[i], 4, 16);
+        ++i;
+    }
+    qDebug("    composed glyph result   = %s", str.toLatin1().constData());
+    str = "";
+    i = 0;
+    while (i < de->layoutData->items[0].num_glyphs) {
+        str += QString("%1 ").arg(de->layoutData->glyphLayout.glyphs[i], 4, 16);
+        ++i;
+    }
+    qDebug("    decomposed glyph result = %s", str.toLatin1().constData());
+    return false;
+}
+#endif
+
+
+void tst_QTextScriptEngine::greek()
+{
+#if defined(Q_WS_X11)
+    {
+        if (QFontDatabase().families(QFontDatabase::Any).contains("DejaVu Sans")) {
+            QFont f("DejaVu Sans");
+            for (int uc = 0x1f00; uc <= 0x1fff; ++uc) {
+                QString str;
+                str.append(uc);
+                if (str.normalized(QString::NormalizationForm_D).normalized(QString::NormalizationForm_C) != str) {
+                    //qDebug() << "skipping" << hex << uc;
+                    continue;
+                }
+                if (uc == 0x1fc1 || uc == 0x1fed)
+                    continue;
+                QVERIFY( decomposedShaping(f, QChar(uc)) );
+            }
+        } else {
+            QSKIP("couln't find DejaVu Sans", SkipAll);
+        }
+    }
+#else
+    QSKIP("X11 specific test", SkipAll);
+#endif
+}
+
 
 QTEST_MAIN(tst_QTextScriptEngine)
 #include "tst_qtextscriptengine.moc"