12 files changed, 770 insertions, 0 deletions
diff --git a/vcl/inc/bitmap/BitmapColorizeFilter.hxx b/vcl/inc/bitmap/BitmapColorizeFilter.hxx
new file mode 100644
index 0000000000..ae511b322d
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapColorizeFilter.hxx
@@ -0,0 +1,30 @@
+/* -*- 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/.
+ *
+ */
+
+#pragma once
+
+#include <tools/color.hxx>
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapColorizeFilter final : public BitmapFilter
+{
+public:
+    BitmapColorizeFilter(Color aColor)
+        : maColor(aColor)
+    {
+    }
+
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+
+private:
+    Color maColor;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapDisabledImageFilter.hxx b/vcl/inc/bitmap/BitmapDisabledImageFilter.hxx
new file mode 100644
index 0000000000..e1d9d21a9d
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapDisabledImageFilter.hxx
@@ -0,0 +1,26 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_BITMAP_BITMAPDISABLEDIMAGEFILTER_HXX
+#define INCLUDED_VCL_INC_BITMAP_BITMAPDISABLEDIMAGEFILTER_HXX
+
+#include <vcl/BitmapFilter.hxx>
+
+class VCL_DLLPUBLIC BitmapDisabledImageFilter final : public BitmapFilter
+{
+public:
+    BitmapDisabledImageFilter() {}
+
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapFastScaleFilter.hxx b/vcl/inc/bitmap/BitmapFastScaleFilter.hxx
new file mode 100644
index 0000000000..bea516c9e0
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapFastScaleFilter.hxx
@@ -0,0 +1,36 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef VCL_INC_BITMAP_BITMAPFASTSCALEFILTER_HXX
+#define VCL_INC_BITMAP_BITMAPFASTSCALEFILTER_HXX
+
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapFastScaleFilter final : public BitmapFilter
+{
+public:
+    explicit BitmapFastScaleFilter(double fScaleX, double fScaleY)
+        : mfScaleX(fScaleX)
+        , mfScaleY(fScaleY)
+    {
+    }
+
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+
+private:
+    double mfScaleX;
+    double mfScaleY;
+    Size maSize;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapInterpolateScaleFilter.hxx b/vcl/inc/bitmap/BitmapInterpolateScaleFilter.hxx
new file mode 100644
index 0000000000..7d17c97d16
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapInterpolateScaleFilter.hxx
@@ -0,0 +1,35 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef VCL_INC_BITMAP_BITMAPINTERPOLATESCALEFILTER_HXX
+#define VCL_INC_BITMAP_BITMAPINTERPOLATESCALEFILTER_HXX
+
+#include <vcl/bitmapex.hxx>
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapInterpolateScaleFilter final : public BitmapFilter
+{
+public:
+    explicit BitmapInterpolateScaleFilter(double fScaleX, double fScaleY)
+        : mfScaleX(fScaleX)
+        , mfScaleY(fScaleY)
+    {
+    }
+
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+
+private:
+    double mfScaleX;
+    double mfScaleY;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapLightenFilter.hxx b/vcl/inc/bitmap/BitmapLightenFilter.hxx
new file mode 100644
index 0000000000..98f2493285
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapLightenFilter.hxx
@@ -0,0 +1,24 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_BITMAP_BITMAPLIGHTENFILTER_HXX
+#define INCLUDED_VCL_INC_BITMAP_BITMAPLIGHTENFILTER_HXX
+
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapLightenFilter final : public BitmapFilter
+{
+public:
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapMaskToAlphaFilter.hxx b/vcl/inc/bitmap/BitmapMaskToAlphaFilter.hxx
new file mode 100644
index 0000000000..355d066846
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapMaskToAlphaFilter.hxx
@@ -0,0 +1,21 @@
+/* -*- 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/.
+ *
+ */
+
+#pragma once
+
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapMaskToAlphaFilter final : public BitmapFilter
+{
+public:
+    virtual BitmapEx execute(BitmapEx const& rBitmapEx) const override;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapScaleConvolutionFilter.hxx b/vcl/inc/bitmap/BitmapScaleConvolutionFilter.hxx
new file mode 100644
index 0000000000..1c9bb8e330
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapScaleConvolutionFilter.hxx
@@ -0,0 +1,78 @@
+/* -*- 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 VCL_INC_BITMAP_BITMAPSCALECONVOLUTIONFILTER_HXX
+#define VCL_INC_BITMAP_BITMAPSCALECONVOLUTIONFILTER_HXX
+
+#include <vcl/BitmapFilter.hxx>
+
+#include <ResampleKernel.hxx>
+
+namespace vcl
+{
+class BitmapScaleConvolutionFilter : public BitmapFilter
+{
+protected:
+    BitmapScaleConvolutionFilter(const double& rScaleX, const double& rScaleY,
+                                 std::unique_ptr<Kernel> pKernel)
+        : mxKernel(std::move(pKernel))
+        , mrScaleX(rScaleX)
+        , mrScaleY(rScaleY)
+    {
+    }
+
+    virtual BitmapEx execute(BitmapEx const& rBitmap) const override;
+
+private:
+    std::unique_ptr<Kernel> mxKernel;
+    double mrScaleX;
+    double mrScaleY;
+};
+
+class VCL_DLLPUBLIC BitmapScaleBilinearFilter final : public BitmapScaleConvolutionFilter
+{
+public:
+    BitmapScaleBilinearFilter(const double& rScaleX, const double& rScaleY)
+        : BitmapScaleConvolutionFilter(rScaleX, rScaleY, std::make_unique<BilinearKernel>())
+    {
+    }
+};
+
+class VCL_DLLPUBLIC BitmapScaleBicubicFilter final : public BitmapScaleConvolutionFilter
+{
+public:
+    BitmapScaleBicubicFilter(const double& rScaleX, const double& rScaleY)
+        : BitmapScaleConvolutionFilter(rScaleX, rScaleY, std::make_unique<BicubicKernel>())
+    {
+    }
+};
+
+class VCL_DLLPUBLIC BitmapScaleLanczos3Filter final : public BitmapScaleConvolutionFilter
+{
+public:
+    BitmapScaleLanczos3Filter(const double& rScaleX, const double& rScaleY)
+        : BitmapScaleConvolutionFilter(rScaleX, rScaleY, std::make_unique<Lanczos3Kernel>())
+    {
+    }
+};
+}
+
+#endif // VCL_INC_BITMAPSCALECONVOLUTIONFILTER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/BitmapScaleSuperFilter.hxx b/vcl/inc/bitmap/BitmapScaleSuperFilter.hxx
new file mode 100644
index 0000000000..46c21d8d78
--- /dev/null
+++ b/vcl/inc/bitmap/BitmapScaleSuperFilter.hxx
@@ -0,0 +1,40 @@
+/* -*- 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_BITMAP_BITMAPSCALESUPER_HXX
+#define INCLUDED_VCL_INC_BITMAP_BITMAPSCALESUPER_HXX
+
+#include <vcl/BitmapFilter.hxx>
+
+class BitmapScaleSuperFilter final : public BitmapFilter
+{
+public:
+    BitmapScaleSuperFilter(const double& rScaleX, const double& rScaleY);
+    virtual ~BitmapScaleSuperFilter() override;
+
+    virtual BitmapEx execute(BitmapEx const& rBitmap) const override;
+
+private:
+    double mrScaleX;
+    double mrScaleY;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/Octree.hxx b/vcl/inc/bitmap/Octree.hxx
new file mode 100644
index 0000000000..3c9b5eb270
--- /dev/null
+++ b/vcl/inc/bitmap/Octree.hxx
@@ -0,0 +1,83 @@
+/* -*- 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_OCTREE_HXX
+#define INCLUDED_VCL_INC_OCTREE_HXX
+
+#include <vcl/dllapi.h>
+#include <vcl/BitmapColor.hxx>
+#include <vcl/BitmapPalette.hxx>
+#include <tools/solar.h>
+
+struct OctreeNode
+{
+    sal_uLong nCount = 0;
+    sal_uLong nRed = 0;
+    sal_uLong nGreen = 0;
+    sal_uLong nBlue = 0;
+    std::unique_ptr<OctreeNode> pChild[8];
+    OctreeNode* pNext = nullptr;
+    sal_uInt16 nPalIndex = 0;
+    bool bLeaf = false;
+};
+
+class BitmapReadAccess;
+
+class VCL_PLUGIN_PUBLIC Octree
+{
+private:
+    void CreatePalette(OctreeNode* pNode);
+    void GetPalIndex(const OctreeNode* pNode, BitmapColor const& color);
+
+    SAL_DLLPRIVATE void add(std::unique_ptr<OctreeNode>& rpNode, BitmapColor const& color);
+    SAL_DLLPRIVATE void reduce();
+
+    BitmapPalette maPalette;
+    sal_uLong mnLeafCount;
+    sal_uLong mnLevel;
+    std::unique_ptr<OctreeNode> pTree;
+    std::vector<OctreeNode*> mpReduce;
+    sal_uInt16 mnPalIndex;
+
+public:
+    Octree(const BitmapReadAccess& rReadAcc, sal_uLong nColors);
+    ~Octree();
+
+    const BitmapPalette& GetPalette();
+    sal_uInt16 GetBestPaletteIndex(const BitmapColor& rColor);
+};
+
+class InverseColorMap
+{
+private:
+    std::vector<sal_uInt8> mpBuffer;
+    std::vector<sal_uInt8> mpMap;
+
+    void ImplCreateBuffers();
+
+public:
+    explicit InverseColorMap(const BitmapPalette& rPal);
+    ~InverseColorMap();
+
+    sal_uInt16 GetBestPaletteIndex(const BitmapColor& rColor);
+};
+
+#endif // INCLUDED_VCL_INC_OCTREE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/ScanlineTools.hxx b/vcl/inc/bitmap/ScanlineTools.hxx
new file mode 100644
index 0000000000..99ce5dc33a
--- /dev/null
+++ b/vcl/inc/bitmap/ScanlineTools.hxx
@@ -0,0 +1,236 @@
+/* -*- 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/.
+ *
+ */
+
+#ifndef INCLUDED_VCL_INC_BITMAP_SCANLINETOOLS_HXX
+#define INCLUDED_VCL_INC_BITMAP_SCANLINETOOLS_HXX
+
+#include <tools/color.hxx>
+#include <vcl/BitmapPalette.hxx>
+
+namespace vcl::bitmap
+{
+class ScanlineTransformer
+{
+public:
+    virtual void startLine(sal_uInt8* pLine) = 0;
+    virtual void skipPixel(sal_uInt32 nPixel) = 0;
+    virtual Color readPixel() = 0;
+    virtual void writePixel(Color nColor) = 0;
+
+    virtual ~ScanlineTransformer() = default;
+};
+
+class ScanlineTransformer_ARGB final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+
+public:
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += nPixel << 2; }
+
+    virtual Color readPixel() override
+    {
+        const Color aColor(ColorAlpha, pData[4], pData[1], pData[2], pData[3]);
+        pData += 4;
+        return aColor;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = nColor.GetAlpha();
+        *pData++ = nColor.GetRed();
+        *pData++ = nColor.GetGreen();
+        *pData++ = nColor.GetBlue();
+    }
+};
+
+class ScanlineTransformer_BGR final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+
+public:
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += (nPixel << 1) + nPixel; }
+
+    virtual Color readPixel() override
+    {
+        const Color aColor(pData[2], pData[1], pData[0]);
+        pData += 3;
+        return aColor;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = nColor.GetBlue();
+        *pData++ = nColor.GetGreen();
+        *pData++ = nColor.GetRed();
+    }
+};
+
+class ScanlineTransformer_8BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+
+public:
+    explicit ScanlineTransformer_8BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+    {
+    }
+
+    virtual void startLine(sal_uInt8* pLine) override { pData = pLine; }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { pData += nPixel; }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt8 nIndex(*pData++);
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        *pData++ = static_cast<sal_uInt8>(mrPalette.GetBestIndex(nColor));
+    }
+};
+
+class ScanlineTransformer_4BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+    sal_uInt32 mnShift;
+
+public:
+    explicit ScanlineTransformer_4BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+        , mnX(0)
+        , mnShift(0)
+    {
+    }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override
+    {
+        mnX += nPixel;
+        if (nPixel & 1) // is nPixel an odd number
+            mnShift ^= 4;
+    }
+
+    virtual void startLine(sal_uInt8* pLine) override
+    {
+        pData = pLine;
+        mnX = 0;
+        mnShift = 4;
+    }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt32 nDataIndex = mnX / 2;
+        const sal_uInt8 nIndex((pData[nDataIndex] >> mnShift) & 0x0f);
+        mnX++;
+        mnShift ^= 4;
+
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        const sal_uInt32 nDataIndex = mnX / 2;
+        const sal_uInt8 nColorIndex = mrPalette.GetBestIndex(nColor);
+        pData[nDataIndex] |= (nColorIndex & 0x0f) << mnShift;
+        mnX++;
+        mnShift ^= 4;
+    }
+};
+
+class ScanlineTransformer_1BitPalette final : public ScanlineTransformer
+{
+private:
+    sal_uInt8* pData;
+    const BitmapPalette& mrPalette;
+    sal_uInt32 mnX;
+
+public:
+    explicit ScanlineTransformer_1BitPalette(const BitmapPalette& rPalette)
+        : pData(nullptr)
+        , mrPalette(rPalette)
+        , mnX(0)
+    {
+    }
+
+    virtual void skipPixel(sal_uInt32 nPixel) override { mnX += nPixel; }
+
+    virtual void startLine(sal_uInt8* pLine) override
+    {
+        pData = pLine;
+        mnX = 0;
+    }
+
+    virtual Color readPixel() override
+    {
+        const sal_uInt8 nIndex((pData[mnX >> 3] >> (7 - (mnX & 7))) & 1);
+        mnX++;
+
+        if (nIndex < mrPalette.GetEntryCount())
+            return mrPalette[nIndex];
+        else
+            return COL_BLACK;
+    }
+
+    virtual void writePixel(Color nColor) override
+    {
+        if (mrPalette.GetBestIndex(nColor) & 1)
+            pData[mnX >> 3] |= 1 << (7 - (mnX & 7));
+        else
+            pData[mnX >> 3] &= ~(1 << (7 - (mnX & 7)));
+        mnX++;
+    }
+};
+
+std::unique_ptr<ScanlineTransformer> getScanlineTransformer(sal_uInt16 nBits,
+                                                            const BitmapPalette& rPalette)
+{
+    switch (nBits)
+    {
+        case 1:
+            return std::make_unique<ScanlineTransformer_1BitPalette>(rPalette);
+        case 4:
+            return std::make_unique<ScanlineTransformer_4BitPalette>(rPalette);
+        case 8:
+            return std::make_unique<ScanlineTransformer_8BitPalette>(rPalette);
+        case 24:
+            return std::make_unique<ScanlineTransformer_BGR>();
+        case 32:
+            return std::make_unique<ScanlineTransformer_ARGB>();
+        default:
+            assert(false);
+            break;
+    }
+    return nullptr;
+}
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/bmpfast.hxx b/vcl/inc/bitmap/bmpfast.hxx
new file mode 100644
index 0000000000..3234f7a840
--- /dev/null
+++ b/vcl/inc/bitmap/bmpfast.hxx
@@ -0,0 +1,51 @@
+/* -*- 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_BMPFAST_HXX
+#define INCLUDED_VCL_INC_BMPFAST_HXX
+
+#include <vcl/dllapi.h>
+#include <vcl/Scanline.hxx>
+#include <tools/long.hxx>
+
+class BitmapWriteAccess;
+class BitmapReadAccess;
+struct BitmapBuffer;
+class BitmapColor;
+struct SalTwoRect;
+
+// the bmpfast functions have signatures with good compatibility to
+// their canonic counterparts, which employ the GetPixel/SetPixel methods
+
+VCL_DLLPUBLIC bool ImplFastBitmapConversion( BitmapBuffer& rDst, const BitmapBuffer& rSrc,
+        const SalTwoRect& rTwoRect );
+
+bool ImplFastCopyScanline( tools::Long nY, BitmapBuffer& rDst, const BitmapBuffer& rSrc);
+bool ImplFastCopyScanline( tools::Long nY, BitmapBuffer& rDst, ConstScanline aSrcScanline,
+    ScanlineFormat nSrcScanlineFormat, sal_uInt32 nSrcScanlineSize);
+
+bool ImplFastBitmapBlending( BitmapWriteAccess const & rDst,
+    const BitmapReadAccess& rSrc, const BitmapReadAccess& rMask,
+    const SalTwoRect& rTwoRect );
+
+bool ImplFastEraseBitmap( BitmapBuffer&, const BitmapColor& );
+
+#endif // INCLUDED_VCL_INC_BMPFAST_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/bitmap/impoctree.hxx b/vcl/inc/bitmap/impoctree.hxx
new file mode 100644
index 0000000000..7581b91088
--- /dev/null
+++ b/vcl/inc/bitmap/impoctree.hxx
@@ -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/.
+ *
+ * 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 <vcl/BitmapColor.hxx>
+
+class ImpErrorQuad
+{
+    sal_Int16 nRed;
+    sal_Int16 nGreen;
+    sal_Int16 nBlue;
+
+public:
+    ImpErrorQuad()
+        : nRed(0)
+        , nGreen(0)
+        , nBlue(0)
+    {
+    }
+
+    ImpErrorQuad(const BitmapColor& rColor)
+        : nRed(rColor.GetRed() << 5)
+        , nGreen(rColor.GetGreen() << 5)
+        , nBlue(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() const;
+};
+
+inline void ImpErrorQuad::operator=(const BitmapColor& rColor)
+{
+    nRed = rColor.GetRed() << 5;
+    nGreen = rColor.GetGreen() << 5;
+    nBlue = rColor.GetBlue() << 5;
+}
+
+inline ImpErrorQuad& ImpErrorQuad::operator-=(const BitmapColor& rColor)
+{
+    nRed -= rColor.GetRed() << 5;
+    nGreen -= rColor.GetGreen() << 5;
+    nBlue -= 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() const
+{
+    return BitmapColor(std::clamp(nRed, sal_Int16(0), sal_Int16(8160)) >> 5,
+                       std::clamp(nGreen, sal_Int16(0), sal_Int16(8160)) >> 5,
+                       std::clamp(nBlue, sal_Int16(0), sal_Int16(8160)) >> 5);
+}
+
+#endif // INCLUDED_VCL_INC_IMPOCTREE_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */