Introduce QFontEngineDirectWrite

Make a font engine for subpixel positioned text on Windows Vista
(with platform update) and Windows 7. If selected during
configuration, the engine will be selected only when the hinting
preference of a font is set to None or Vertical hinting. The font
database uses most of the same logic but creates a direct write
font based on the LOGFONT rather than a GDI handle.

The engine is currently regarded as experimental, meaning that code
using it should do substantial testing to make sure it covers their
use cases.

Task-number: QTBUG-12678
Reviewed-by: Jiang Jiang

1 files changed, 60 insertions, 0 deletions

diff --git a/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp b/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
index 4f4e706a..07da68d 100644
--- a/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
+++ b/tests/auto/qtextscriptengine/tst_qtextscriptengine.cpp
@@ -61,6 +61,9 @@
 #include <private/qtextengine_p.h>
 #include <qtextlayout.h>
 #undef private
+#else
+#include <private/qtextengine_p.h>
+#include <qtextlayout.h>
 #endif
 
 #include <qfontdatabase.h>
@@ -105,6 +108,9 @@ private slots:
     void linearB();
     void controlInSyllable_qtbug14204();
     void combiningMarks_qtbug15675();
+
+    void mirroredChars_data();
+    void mirroredChars();
 };
 
 tst_QTextScriptEngine::tst_QTextScriptEngine()
@@ -1156,5 +1162,59 @@ void tst_QTextScriptEngine::combiningMarks_qtbug15675()
 #endif
 }
 
+void tst_QTextScriptEngine::mirroredChars_data()
+{
+    QTest::addColumn<int>("hintingPreference");
+
+    QTest::newRow("Default hinting") << int(QFont::PreferDefaultHinting);
+    QTest::newRow("No hinting") << int(QFont::PreferNoHinting);
+    QTest::newRow("Vertical hinting") << int(QFont::PreferVerticalHinting);
+    QTest::newRow("Full hinting") << int(QFont::PreferFullHinting);
+}
+
+void tst_QTextScriptEngine::mirroredChars()
+{
+    QFETCH(int, hintingPreference);
+
+    QFont font;
+    font.setHintingPreference(QFont::HintingPreference(hintingPreference));
+
+    QString s;
+    s.append(QLatin1Char('('));
+    s.append(QLatin1Char(')'));
+
+    HB_Glyph leftParenthesis;
+    HB_Glyph rightParenthesis;
+    {
+        QTextLayout layout(s);
+        layout.beginLayout();
+        layout.createLine();
+        layout.endLayout();
+
+        QTextEngine *e = layout.engine();
+        e->itemize();
+        e->shape(0);
+        QCOMPARE(e->layoutData->items[0].num_glyphs, ushort(2));
+
+        const QGlyphLayout &glyphLayout = e->layoutData->glyphLayout;
+        leftParenthesis = glyphLayout.glyphs[0];
+        rightParenthesis = glyphLayout.glyphs[1];
+    }
+
+    {
+        QTextLayout layout(s);
+        layout.setFlags(Qt::TextForceRightToLeft);
+
+        QTextEngine *e = layout.engine();
+        e->itemize();
+        e->shape(0);
+        QCOMPARE(e->layoutData->items[0].num_glyphs, ushort(2));
+
+        const QGlyphLayout &glyphLayout = e->layoutData->glyphLayout;
+        QCOMPARE(glyphLayout.glyphs[0], rightParenthesis);
+        QCOMPARE(glyphLayout.glyphs[1], leftParenthesis);
+    }
+}
+
 QTEST_MAIN(tst_QTextScriptEngine)
 #include "tst_qtextscriptengine.moc"