1 files changed, 101 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapMonochromeFilter.cxx b/vcl/source/bitmap/BitmapMonochromeFilter.cxx
new file mode 100644
index 000000000000..0bdb2cd09226
--- /dev/null
+++ b/vcl/source/bitmap/BitmapMonochromeFilter.cxx
@@ -0,0 +1,101 @@
+/* -*- 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/BitmapMonochromeFilter.hxx>
+#include <vcl/bitmapaccess.hxx>
+
+#include <bitmapwriteaccess.hxx>
+
+BitmapEx BitmapMonochromeFilter::execute(BitmapEx const& aBitmapEx)
+{
+    Bitmap aBitmap = aBitmapEx.GetBitmap();
+    Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+    bool bRet = false;
+
+    if (pReadAcc)
+    {
+        Bitmap aNewBmp(aBitmap.GetSizePixel(), 1);
+        BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+        if (pWriteAcc)
+        {
+            const BitmapColor aBlack(pWriteAcc->GetBestMatchingColor(COL_BLACK));
+            const BitmapColor aWhite(pWriteAcc->GetBestMatchingColor(COL_WHITE));
+            const long nWidth = pWriteAcc->Width();
+            const long nHeight = pWriteAcc->Height();
+
+            if (pReadAcc->HasPalette())
+            {
+                for (long nY = 0; nY < nHeight; nY++)
+                {
+                    Scanline pScanline = pWriteAcc->GetScanline(nY);
+                    Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+                    for (long nX = 0; nX < nWidth; nX++)
+                    {
+                        const sal_uInt8 cIndex = pReadAcc->GetIndexFromData(pScanlineRead, nX);
+                        if (pReadAcc->GetPaletteColor(cIndex).GetLuminance() >= mcThreshold)
+                        {
+                            pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
+                        }
+                        else
+                        {
+                            pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
+                        }
+                    }
+                }
+            }
+            else
+            {
+                for (long nY = 0; nY < nHeight; nY++)
+                {
+                    Scanline pScanline = pWriteAcc->GetScanline(nY);
+                    Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+                    for (long nX = 0; nX < nWidth; nX++)
+                    {
+                        if (pReadAcc->GetPixelFromData(pScanlineRead, nX).GetLuminance()
+                            >= mcThreshold)
+                        {
+                            pWriteAcc->SetPixelOnData(pScanline, nX, aWhite);
+                        }
+                        else
+                        {
+                            pWriteAcc->SetPixelOnData(pScanline, nX, aBlack);
+                        }
+                    }
+                }
+            }
+
+            pWriteAcc.reset();
+            bRet = true;
+        }
+
+        pReadAcc.reset();
+
+        if (bRet)
+        {
+            const MapMode aMap(aBitmap.GetPrefMapMode());
+            const Size aSize(aBitmap.GetPrefSize());
+
+            aBitmap = aNewBmp;
+
+            aBitmap.SetPrefMapMode(aMap);
+            aBitmap.SetPrefSize(aSize);
+        }
+    }
+
+    if (bRet)
+        return BitmapEx(aBitmap);
+
+    return BitmapEx();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */