1 files changed, 58 insertions, 0 deletions
diff --git a/src/gui/text/unix/qfontenginemultifontconfig.cpp b/src/gui/text/unix/qfontenginemultifontconfig.cpp
new file mode 100644
index 0000000000..6419a764f7
--- /dev/null
+++ b/src/gui/text/unix/qfontenginemultifontconfig.cpp
@@ -0,0 +1,58 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include "qfontenginemultifontconfig_p.h"
+
+#include <QtGui/private/qfontengine_ft_p.h>
+
+QT_BEGIN_NAMESPACE
+
+QFontEngineMultiFontConfig::QFontEngineMultiFontConfig(QFontEngine *fe, int script)
+    : QFontEngineMulti(fe, script)
+{
+}
+
+QFontEngineMultiFontConfig::~QFontEngineMultiFontConfig()
+{
+    for (FcPattern *pattern : std::as_const(cachedMatchPatterns)) {
+        if (pattern)
+            FcPatternDestroy(pattern);
+    }
+}
+
+bool QFontEngineMultiFontConfig::shouldLoadFontEngineForCharacter(int at, uint ucs4) const
+{
+    bool charSetHasChar = true;
+    FcPattern *matchPattern = getMatchPatternForFallback(at - 1);
+    if (matchPattern != nullptr) {
+        FcCharSet *charSet;
+        FcPatternGetCharSet(matchPattern, FC_CHARSET, 0, &charSet);
+        charSetHasChar = FcCharSetHasChar(charSet, ucs4);
+    }
+
+    return charSetHasChar;
+}
+
+
+FcPattern * QFontEngineMultiFontConfig::getMatchPatternForFallback(int fallBackIndex) const
+{
+    Q_ASSERT(fallBackIndex < fallbackFamilyCount());
+    if (fallbackFamilyCount() > cachedMatchPatterns.size())
+        cachedMatchPatterns.resize(fallbackFamilyCount());
+    FcPattern *ret = cachedMatchPatterns.at(fallBackIndex);
+    if (ret)
+        return ret;
+    FcPattern *requestPattern = FcPatternCreate();
+    FcValue value;
+    value.type = FcTypeString;
+    QByteArray cs = fallbackFamilyAt(fallBackIndex).toUtf8();
+    value.u.s = reinterpret_cast<const FcChar8 *>(cs.data());
+    FcPatternAdd(requestPattern, FC_FAMILY, value, true);
+    FcResult result;
+    ret = FcFontMatch(nullptr, requestPattern, &result);
+    cachedMatchPatterns.insert(fallBackIndex, ret);
+    FcPatternDestroy(requestPattern);
+    return ret;
+}
+
+QT_END_NAMESPACE