1 files changed, 109 insertions, 0 deletions
diff --git a/vcl/inc/bitmap/impoctree.hxx b/vcl/inc/bitmap/impoctree.hxx
new file mode 100644
index 000000000..06fbd6924
--- /dev/null
+++ b/vcl/inc/bitmap/impoctree.hxx
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_VCL_INC_IMPOCTREE_HXX
+#define INCLUDED_VCL_INC_IMPOCTREE_HXX
+
+#include "Octree.hxx"
+
+class ImpErrorQuad
+{
+    long nRed;
+    long nGreen;
+    long nBlue;
+
+public:
+    ImpErrorQuad()
+        : nRed(0)
+        , nGreen(0)
+        , nBlue(0)
+    {
+    }
+
+    ImpErrorQuad(const BitmapColor& rColor)
+        : nRed(long(rColor.GetRed()) << 5)
+        , nGreen(long(rColor.GetGreen()) << 5)
+        , nBlue(long(rColor.GetBlue()) << 5)
+    {
+    }
+
+    inline void operator=(const BitmapColor& rColor);
+    inline ImpErrorQuad& operator-=(const BitmapColor& rColor);
+
+    inline void ImplAddColorError1(const ImpErrorQuad& rErrQuad);
+    inline void ImplAddColorError3(const ImpErrorQuad& rErrQuad);
+    inline void ImplAddColorError5(const ImpErrorQuad& rErrQuad);
+    inline void ImplAddColorError7(const ImpErrorQuad& rErrQuad);
+
+    inline BitmapColor ImplGetColor();
+};
+
+inline void ImpErrorQuad::operator=(const BitmapColor& rColor)
+{
+    nRed = long(rColor.GetRed()) << 5;
+    nGreen = long(rColor.GetGreen()) << 5;
+    nBlue = long(rColor.GetBlue()) << 5;
+}
+
+inline ImpErrorQuad& ImpErrorQuad::operator-=(const BitmapColor& rColor)
+{
+    nRed -= long(rColor.GetRed()) << 5;
+    nGreen -= long(rColor.GetGreen()) << 5;
+    nBlue -= long(rColor.GetBlue()) << 5;
+
+    return *this;
+}
+
+inline void ImpErrorQuad::ImplAddColorError1(const ImpErrorQuad& rErrQuad)
+{
+    nRed += rErrQuad.nRed >> 4;
+    nGreen += rErrQuad.nGreen >> 4;
+    nBlue += rErrQuad.nBlue >> 4;
+}
+
+inline void ImpErrorQuad::ImplAddColorError3(const ImpErrorQuad& rErrQuad)
+{
+    nRed += rErrQuad.nRed * 3L >> 4;
+    nGreen += rErrQuad.nGreen * 3L >> 4;
+    nBlue += rErrQuad.nBlue * 3L >> 4;
+}
+
+inline void ImpErrorQuad::ImplAddColorError5(const ImpErrorQuad& rErrQuad)
+{
+    nRed += rErrQuad.nRed * 5L >> 4;
+    nGreen += rErrQuad.nGreen * 5L >> 4;
+    nBlue += rErrQuad.nBlue * 5L >> 4;
+}
+
+inline void ImpErrorQuad::ImplAddColorError7(const ImpErrorQuad& rErrQuad)
+{
+    nRed += rErrQuad.nRed * 7L >> 4;
+    nGreen += rErrQuad.nGreen * 7L >> 4;
+    nBlue += rErrQuad.nBlue * 7L >> 4;
+}
+
+inline BitmapColor ImpErrorQuad::ImplGetColor()
+{
+    return BitmapColor(std::clamp(nRed, 0L, 8160L) >> 5, std::clamp(nGreen, 0L, 8160L) >> 5,
+                       std::clamp(nBlue, 0L, 8160L) >> 5);
+}
+
+#endif // INCLUDED_VCL_INC_IMPOCTREE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */