1 files changed, 48 insertions, 0 deletions
diff --git a/src/plugins/terminal/glyphcache.cpp b/src/plugins/terminal/glyphcache.cpp
new file mode 100644
index 00000000000..72a0fd7b9d1
--- /dev/null
+++ b/src/plugins/terminal/glyphcache.cpp
@@ -0,0 +1,48 @@
+// Copyright (C) 2022 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "glyphcache.h"
+
+#include <QTextLayout>
+
+namespace Terminal::Internal {
+
+size_t qHash(const GlyphCacheKey &key, size_t seed = 0)
+{
+    return qHash(key.font, seed) ^ qHash(key.text, seed);
+}
+
+GlyphCache &GlyphCache::instance()
+{
+    static GlyphCache cache(5000);
+    return cache;
+}
+
+const QGlyphRun *GlyphCache::get(const QFont &font, const QString &text)
+{
+    GlyphCacheKey key{font, text};
+    if (auto *run = object(key))
+        return run;
+
+    QTextLayout layout;
+
+    layout.setText(text);
+    layout.setFont(font);
+
+    layout.beginLayout();
+    layout.createLine().setNumColumns(std::numeric_limits<int>::max());
+    layout.endLayout();
+
+    if (layout.lineCount() > 0) {
+        const auto &line = layout.lineAt(0);
+        const auto runs = line.glyphRuns();
+        if (!runs.isEmpty()) {
+            QGlyphRun *run = new QGlyphRun(layout.lineAt(0).glyphRuns().first());
+            insert(key, run);
+            return run;
+        }
+    }
+    return nullptr;
+}
+
+} // namespace Terminal::Internal