1 files changed, 110 insertions, 0 deletions
diff --git a/vcl/source/bitmap/BitmapSepiaFilter.cxx b/vcl/source/bitmap/BitmapSepiaFilter.cxx
new file mode 100644
index 000000000..1554def4d
--- /dev/null
+++ b/vcl/source/bitmap/BitmapSepiaFilter.cxx
@@ -0,0 +1,110 @@
+/* -*- 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 <sal/config.h>
+
+#include <vcl/bitmap.hxx>
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapSepiaFilter.hxx>
+
+#include <bitmap/BitmapWriteAccess.hxx>
+
+#include <algorithm>
+
+BitmapEx BitmapSepiaFilter::execute(BitmapEx const& rBitmapEx) const
+{
+    Bitmap aBitmap(rBitmapEx.GetBitmap());
+    Bitmap::ScopedReadAccess pReadAcc(aBitmap);
+    bool bRet = false;
+
+    if (pReadAcc)
+    {
+        const sal_Int32 nSepia
+            = 10000 - 100 * std::clamp(mnSepiaPercent, sal_uInt16(0), sal_uInt16(100));
+        BitmapPalette aSepiaPal(256);
+
+        for (sal_uInt16 i = 0; i < 256; i++)
+        {
+            BitmapColor& rCol = aSepiaPal[i];
+            const sal_uInt8 cSepiaValue = static_cast<sal_uInt8>(nSepia * i / 10000);
+
+            rCol.SetRed(static_cast<sal_uInt8>(i));
+            rCol.SetGreen(cSepiaValue);
+            rCol.SetBlue(cSepiaValue);
+        }
+
+        Bitmap aNewBmp(aBitmap.GetSizePixel(), vcl::PixelFormat::N8_BPP, &aSepiaPal);
+        BitmapScopedWriteAccess pWriteAcc(aNewBmp);
+
+        if (pWriteAcc)
+        {
+            BitmapColor aCol(sal_uInt8(0));
+            const sal_Int32 nWidth = pWriteAcc->Width();
+            const sal_Int32 nHeight = pWriteAcc->Height();
+
+            if (pReadAcc->HasPalette())
+            {
+                const sal_uInt16 nPalCount = pReadAcc->GetPaletteEntryCount();
+                std::unique_ptr<sal_uInt8[]> pIndexMap(new sal_uInt8[nPalCount]);
+                for (sal_uInt16 i = 0; i < nPalCount; i++)
+                {
+                    pIndexMap[i] = pReadAcc->GetPaletteColor(i).GetLuminance();
+                }
+
+                for (sal_Int32 nY = 0; nY < nHeight; nY++)
+                {
+                    Scanline pScanline = pWriteAcc->GetScanline(nY);
+                    Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+                    for (sal_Int32 nX = 0; nX < nWidth; nX++)
+                    {
+                        aCol.SetIndex(pIndexMap[pReadAcc->GetIndexFromData(pScanlineRead, nX)]);
+                        pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
+                    }
+                }
+            }
+            else
+            {
+                for (sal_Int32 nY = 0; nY < nHeight; nY++)
+                {
+                    Scanline pScanline = pWriteAcc->GetScanline(nY);
+                    Scanline pScanlineRead = pReadAcc->GetScanline(nY);
+                    for (sal_Int32 nX = 0; nX < nWidth; nX++)
+                    {
+                        aCol.SetIndex(pReadAcc->GetPixelFromData(pScanlineRead, nX).GetLuminance());
+                        pWriteAcc->SetPixelOnData(pScanline, nX, aCol);
+                    }
+                }
+            }
+
+            pWriteAcc.reset();
+            bRet = true;
+        }
+
+        pReadAcc.reset();
+
+        if (bRet)
+        {
+            const MapMode aMap(aBitmap.GetPrefMapMode());
+            const Size aPrefSize(aBitmap.GetPrefSize());
+
+            aBitmap = aNewBmp;
+
+            aBitmap.SetPrefMapMode(aMap);
+            aBitmap.SetPrefSize(aPrefSize);
+        }
+    }
+
+    if (bRet)
+        return BitmapEx(aBitmap);
+
+    return BitmapEx();
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */