1 files changed, 60 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapDuoToneFilter.cxx b/vcl/source/bitmap/BitmapDuoToneFilter.cxx
new file mode 100644
index 000000000..41c3f60fc
--- /dev/null
+++ b/vcl/source/bitmap/BitmapDuoToneFilter.cxx
@@ -0,0 +1,60 @@
+/* -*- 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/.
+ *
+ */
+
+#include <vcl/bitmap.hxx>
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapDuoToneFilter.hxx>
+
+#include <bitmap/BitmapWriteAccess.hxx>
+
+static sal_uInt8 lcl_getDuotoneColorComponent(sal_uInt8 base, sal_uInt16 color1, sal_uInt16 color2)
+{
+    color2 = color2 * base / 0xFF;
+    color1 = color1 * (0xFF - base) / 0xFF;
+
+    return static_cast<sal_uInt8>(color1 + color2);
+}
+
+BitmapEx BitmapDuoToneFilter::execute(BitmapEx const& rBitmapEx) const
+{
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+
+    const sal_Int32 nWidth = aBitmap.GetSizePixel().Width();
+    const sal_Int32 nHeight = aBitmap.GetSizePixel().Height();
+
+    Bitmap aResultBitmap(aBitmap.GetSizePixel(), vcl::PixelFormat::N24_BPP);
+    Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+    BitmapScopedWriteAccess pWriteAcc(aResultBitmap);
+    const BitmapColor aColorOne(mnColorOne);
+    const BitmapColor aColorTwo(mnColorTwo);
+
+    for (sal_Int32 x = 0; x < nWidth; x++)
+    {
+        for (sal_Int32 y = 0; y < nHeight; y++)
+        {
+            BitmapColor aColor = pReadAcc->GetColor(y, x);
+            sal_uInt8 nLuminance = aColor.GetLuminance();
+            BitmapColor aResultColor(
+                lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetRed(), aColorTwo.GetRed()),
+                lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetGreen(),
+                                             aColorTwo.GetGreen()),
+                lcl_getDuotoneColorComponent(nLuminance, aColorOne.GetBlue(), aColorTwo.GetBlue()));
+            pWriteAcc->SetPixel(y, x, aResultColor);
+        }
+    }
+
+    pWriteAcc.reset();
+    pReadAcc.reset();
+    aBitmap.ReassignWithSize(aResultBitmap);
+
+    return BitmapEx(aBitmap);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */