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diff --git a/vcl/inc/skia/gdiimpl.hxx b/vcl/inc/skia/gdiimpl.hxx
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+/* -*- 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_SKIA_GDIIMPL_HXX
+#define INCLUDED_VCL_SKIA_GDIIMPL_HXX
+
+#include <vcl/dllapi.h>
+
+#include <salgdiimpl.hxx>
+#include <salgeom.hxx>
+
+#include <SkSurface.h>
+#include <SkRegion.h>
+
+#include <prewin.h>
+#include <tools/sk_app/WindowContext.h>
+#include <postwin.h>
+
+class SkiaFlushIdle;
+class GenericSalLayout;
+class SkFont;
+class SkiaSalBitmap;
+
+class VCL_DLLPUBLIC SkiaSalGraphicsImpl : public SalGraphicsImpl
+{
+public:
+    SkiaSalGraphicsImpl(SalGraphics& pParent, SalGeometryProvider* pProvider);
+    virtual ~SkiaSalGraphicsImpl() override;
+
+    virtual void Init() override;
+
+    virtual void DeInit() override;
+
+    virtual OUString getRenderBackendName() const override { return "skia"; }
+
+    const vcl::Region& getClipRegion() const;
+    virtual bool setClipRegion(const vcl::Region&) override;
+
+    //
+    // get the depth of the device
+    virtual sal_uInt16 GetBitCount() const override;
+
+    // get the width of the device
+    virtual long GetGraphicsWidth() const override;
+
+    // set the clip region to empty
+    virtual void ResetClipRegion() override;
+
+    // set the line color to transparent (= don't draw lines)
+
+    virtual void SetLineColor() override;
+
+    // set the line color to a specific color
+    virtual void SetLineColor(Color nColor) override;
+
+    // set the fill color to transparent (= don't fill)
+    virtual void SetFillColor() override;
+
+    // set the fill color to a specific color, shapes will be
+    // filled accordingly
+    virtual void SetFillColor(Color nColor) override;
+
+    // enable/disable XOR drawing
+    virtual void SetXORMode(bool bSet, bool bInvertOnly) override;
+
+    // set line color for raster operations
+    virtual void SetROPLineColor(SalROPColor nROPColor) override;
+
+    // set fill color for raster operations
+    virtual void SetROPFillColor(SalROPColor nROPColor) override;
+
+    // draw --> LineColor and FillColor and RasterOp and ClipRegion
+    virtual void drawPixel(long nX, long nY) override;
+    virtual void drawPixel(long nX, long nY, Color nColor) override;
+
+    virtual void drawLine(long nX1, long nY1, long nX2, long nY2) override;
+
+    virtual void drawRect(long nX, long nY, long nWidth, long nHeight) override;
+
+    virtual void drawPolyLine(sal_uInt32 nPoints, const SalPoint* pPtAry) override;
+
+    virtual void drawPolygon(sal_uInt32 nPoints, const SalPoint* pPtAry) override;
+
+    virtual void drawPolyPolygon(sal_uInt32 nPoly, const sal_uInt32* pPoints,
+                                 PCONSTSALPOINT* pPtAry) override;
+
+    virtual bool drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice,
+                                 const basegfx::B2DPolyPolygon&, double fTransparency) override;
+
+    virtual bool drawPolyLine(const basegfx::B2DHomMatrix& rObjectToDevice,
+                              const basegfx::B2DPolygon&, double fTransparency, double fLineWidth,
+                              const std::vector<double>* pStroke, basegfx::B2DLineJoin,
+                              css::drawing::LineCap, double fMiterMinimumAngle,
+                              bool bPixelSnapHairline) override;
+
+    virtual bool drawPolyLineBezier(sal_uInt32 nPoints, const SalPoint* pPtAry,
+                                    const PolyFlags* pFlgAry) override;
+
+    virtual bool drawPolygonBezier(sal_uInt32 nPoints, const SalPoint* pPtAry,
+                                   const PolyFlags* pFlgAry) override;
+
+    virtual bool drawPolyPolygonBezier(sal_uInt32 nPoly, const sal_uInt32* pPoints,
+                                       const SalPoint* const* pPtAry,
+                                       const PolyFlags* const* pFlgAry) override;
+
+    // CopyArea --> No RasterOp, but ClipRegion
+    virtual void copyArea(long nDestX, long nDestY, long nSrcX, long nSrcY, long nSrcWidth,
+                          long nSrcHeight, bool bWindowInvalidate) override;
+
+    virtual void copyBits(const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics) override;
+
+    virtual bool blendBitmap(const SalTwoRect&, const SalBitmap& rBitmap) override;
+
+    virtual bool blendAlphaBitmap(const SalTwoRect&, const SalBitmap& rSrcBitmap,
+                                  const SalBitmap& rMaskBitmap,
+                                  const SalBitmap& rAlphaBitmap) override;
+
+    virtual void drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap) override;
+
+    virtual void drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,
+                            const SalBitmap& rMaskBitmap) override;
+
+    virtual void drawMask(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,
+                          Color nMaskColor) override;
+
+    virtual std::shared_ptr<SalBitmap> getBitmap(long nX, long nY, long nWidth,
+                                                 long nHeight) override;
+
+    virtual Color getPixel(long nX, long nY) override;
+
+    // invert --> ClipRegion (only Windows or VirDevs)
+    virtual void invert(long nX, long nY, long nWidth, long nHeight, SalInvert nFlags) override;
+
+    virtual void invert(sal_uInt32 nPoints, const SalPoint* pPtAry, SalInvert nFlags) override;
+
+    virtual bool drawEPS(long nX, long nY, long nWidth, long nHeight, void* pPtr,
+                         sal_uInt32 nSize) override;
+
+    /** Render bitmap with alpha channel
+
+        @param rSourceBitmap
+        Source bitmap to blit
+
+        @param rAlphaBitmap
+        Alpha channel to use for blitting
+
+        @return true, if the operation succeeded, and false
+        otherwise. In this case, clients should try to emulate alpha
+        compositing themselves
+     */
+    virtual bool drawAlphaBitmap(const SalTwoRect&, const SalBitmap& rSourceBitmap,
+                                 const SalBitmap& rAlphaBitmap) override;
+
+    /** draw transformed bitmap (maybe with alpha) where Null, X, Y define the coordinate system */
+    virtual bool drawTransformedBitmap(const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX,
+                                       const basegfx::B2DPoint& rY, const SalBitmap& rSourceBitmap,
+                                       const SalBitmap* pAlphaBitmap) override;
+
+    /** Render solid rectangle with given transparency
+
+      @param nX             Top left coordinate of rectangle
+
+      @param nY             Bottom right coordinate of rectangle
+
+      @param nWidth         Width of rectangle
+
+      @param nHeight        Height of rectangle
+
+      @param nTransparency  Transparency value (0-255) to use. 0 blits and opaque, 255 a
+                            fully transparent rectangle
+
+      @returns true if successfully drawn, false if not able to draw rectangle
+     */
+    virtual bool drawAlphaRect(long nX, long nY, long nWidth, long nHeight,
+                               sal_uInt8 nTransparency) override;
+
+    virtual bool drawGradient(const tools::PolyPolygon& rPolygon,
+                              const Gradient& rGradient) override;
+
+    virtual bool supportsOperation(OutDevSupportType eType) const override;
+
+#ifdef DBG_UTIL
+    void dump(const char* file) const;
+#endif
+
+    // Default blend mode for SkPaint is SkBlendMode::kSrcOver
+    void drawImage(const SalTwoRect& rPosAry, const sk_sp<SkImage>& aImage,
+                   SkBlendMode eBlendMode = SkBlendMode::kSrcOver);
+
+    void drawShader(const SalTwoRect& rPosAry, const sk_sp<SkShader>& shader);
+
+    enum class GlyphOrientation
+    {
+        Apply,
+        Ignore
+    };
+    void drawGenericLayout(const GenericSalLayout& layout, Color textColor, const SkFont& font,
+                           GlyphOrientation glyphOrientation);
+
+protected:
+    // To be called before any drawing.
+    void preDraw();
+    // To be called after any drawing.
+    void postDraw();
+    // The canvas to draw to. Will be diverted to a temporary for Xor mode.
+    SkCanvas* getDrawCanvas() { return mXorMode ? getXorCanvas() : mSurface->getCanvas(); }
+    // Call before makeImageSnapshot(), ensures the content is up to date.
+    void flushDrawing();
+
+    virtual void createSurface();
+    // Call to ensure that mSurface is valid. If mSurface is going to be modified,
+    // use preDraw() instead of this.
+    void checkSurface();
+    void destroySurface();
+    // Reimplemented for X11.
+    virtual bool avoidRecreateByResize() const { return false; }
+    void createWindowSurface(bool forceRaster = false);
+    virtual void createWindowContext(bool forceRaster = false) = 0;
+    void createOffscreenSurface();
+
+    void privateDrawAlphaRect(long nX, long nY, long nWidth, long nHeight, double nTransparency,
+                              bool blockAA = false);
+
+    void setProvider(SalGeometryProvider* provider) { mProvider = provider; }
+
+    bool isOffscreen() const { return mProvider == nullptr || mProvider->IsOffScreen(); }
+    bool isGPU() const { return mIsGPU; }
+
+    void invert(basegfx::B2DPolygon const& rPoly, SalInvert eFlags);
+
+    // Called by SkiaFlushIdle.
+    virtual void performFlush() = 0;
+    void scheduleFlush();
+    friend class SkiaFlushIdle;
+
+    // get the width of the device
+    int GetWidth() const { return mProvider ? mProvider->GetWidth() : 1; }
+    // get the height of the device
+    int GetHeight() const { return mProvider ? mProvider->GetHeight() : 1; }
+
+    SkCanvas* getXorCanvas();
+    void applyXor();
+    // NOTE: This must be called before the operation does any drawing.
+    void addXorRegion(const SkRect& rect)
+    {
+        if (mXorMode)
+        {
+            // Make slightly larger, just in case (rounding, antialiasing,...).
+            SkIRect addedRect = rect.makeOutset(2, 2).round();
+            // Two xor operations should cancel each other out. We batch xor operations,
+            // but if they can overlap, apply xor now, since applyXor() does the operation
+            // just once.
+            if (mXorRegion.intersects(addedRect))
+                applyXor();
+            mXorRegion.op(addedRect, SkRegion::kUnion_Op);
+        }
+    }
+    static void setCanvasClipRegion(SkCanvas* canvas, const vcl::Region& region);
+    sk_sp<SkImage> mergeCacheBitmaps(const SkiaSalBitmap& bitmap, const SkiaSalBitmap* alphaBitmap,
+                                     const Size targetSize);
+
+    // Skia uses floating point coordinates, so when we use integer coordinates, sometimes
+    // rounding results in off-by-one errors (down), especially when drawing using GPU,
+    // see https://bugs.chromium.org/p/skia/issues/detail?id=9611 . Compensate for
+    // it by using centers of pixels. Using 0.5 may sometimes round up, so go with 0.495 .
+    static constexpr SkScalar toSkX(long x) { return x + 0.495; }
+    static constexpr SkScalar toSkY(long y) { return y + 0.495; }
+    // Value to add to be exactly in the middle of the pixel.
+    static constexpr SkScalar toSkXYFix = SkScalar(0.005);
+
+    // Perform any pending drawing such as delayed merging of polygons. Called by preDraw()
+    // and anything that means the next operation cannot be another one in a series (e.g.
+    // changing colors).
+    void checkPendingDrawing();
+    bool delayDrawPolyPolygon(const basegfx::B2DPolyPolygon& polygon, double transparency);
+    void performDrawPolyPolygon(const basegfx::B2DPolyPolygon& polygon, double transparency,
+                                bool useAA);
+
+    template <typename charT, typename traits>
+    friend inline std::basic_ostream<charT, traits>&
+    operator<<(std::basic_ostream<charT, traits>& stream, const SkiaSalGraphicsImpl* graphics)
+    { // O - offscreen, G - GPU-based, R - raster
+        return stream << static_cast<const void*>(graphics) << " "
+                      << Size(graphics->GetWidth(), graphics->GetHeight())
+                      << (graphics->isGPU() ? "G" : "R") << (graphics->isOffscreen() ? "O" : "");
+    }
+
+    SalGraphics& mParent;
+    /// Pointer to the SalFrame or SalVirtualDevice
+    SalGeometryProvider* mProvider;
+    std::unique_ptr<sk_app::WindowContext> mWindowContext;
+    // The Skia surface that is target of all the rendering.
+    sk_sp<SkSurface> mSurface;
+    bool mIsGPU; // whether the surface is GPU-backed
+    // Keep reference to shared GrContext.
+    vcl::Region mClipRegion;
+    Color mLineColor;
+    Color mFillColor;
+    bool mXorMode;
+    SkBitmap mXorBitmap;
+    std::unique_ptr<SkCanvas> mXorCanvas;
+    SkRegion mXorRegion; // the area that needs updating for the xor operation
+    std::unique_ptr<SkiaFlushIdle> mFlush;
+    // Info about pending polygons to draw (we try to merge adjacent polygons into one).
+    struct LastPolyPolygonInfo
+    {
+        basegfx::B2DPolyPolygonVector polygons;
+        basegfx::B2DRange bounds;
+        double transparency;
+    };
+    LastPolyPolygonInfo mLastPolyPolygonInfo;
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */