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diff --git a/vcl/inc/skia/skiagdiimpl.hxx b/vcl/inc/skia/skiagdiimpl.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_SKIAGDIIMPL_HXX
+#define INCLUDED_VCL_SKIA_SKIAGDIIMPL_HXX
+
+#include <vcl/dllapi.h>
+
+class VCL_DLLPUBLIC SkiaSalGraphicsImpl : public SalGraphicsImpl
+{
+protected:
+    SalGraphics& mrParent;
+    /// Pointer to the SalFrame or SalVirtualDevice
+    SalGeometryProvider* mpProvider;
+
+    // clipping
+    vcl::Region maClipRegion;
+    bool mbUseScissor;
+    bool mbUseStencil;
+
+    bool mbXORMode;
+
+    bool mbAcquiringSkiaContext;
+
+    Color mnLineColor;
+    Color mnFillColor;
+#ifdef DBG_UTIL
+    bool mProgramIsSolidColor;
+#endif
+    sal_uInt32 mnDrawCount;
+    sal_uInt32 mnDrawCountAtFlush;
+    Color mProgramSolidColor;
+    double mProgramSolidTransparency;
+
+    std::unique_ptr<RenderList> mpRenderList;
+
+    void ImplInitClipRegion();
+    void ImplSetClipBit(const vcl::Region& rClip, GLuint nMask);
+    void ImplDrawLineAA(double nX1, double nY1, double nX2, double nY2, bool edge);
+    void CheckOffscreenTexture();
+
+    void ApplyProgramMatrices(float fPixelOffset = 0.0);
+
+public:
+    bool UseProgram(const OUString& rVertexShader, const OUString& rFragmentShader,
+                    const OString& preamble = "");
+    bool UseSolid(Color nColor, sal_uInt8 nTransparency);
+    bool UseSolid(Color nColor, double fTransparency);
+    bool UseSolid(Color nColor);
+    void UseSolid();
+    bool UseLine(Color nColor, double fTransparency, GLfloat fLineWidth, bool bUseAA);
+    void UseLine(GLfloat fLineWidth, bool bUseAA);
+    bool UseInvert50();
+    bool UseInvert(SalInvert nFlags);
+
+    void DrawConvexPolygon(sal_uInt32 nPoints, const SalPoint* pPtAry, bool blockAA = false);
+    void DrawConvexPolygon(const tools::Polygon& rPolygon, bool blockAA);
+    void DrawTrapezoid(const basegfx::B2DTrapezoid& trapezoid, bool blockAA);
+    void DrawRect(long nX, long nY, long nWidth, long nHeight);
+    void DrawRect(const tools::Rectangle& rRect);
+    void DrawPolygon(sal_uInt32 nPoints, const SalPoint* pPtAry);
+    void DrawLineSegment(float x1, float y1, float x2, float y2);
+    void DrawPolyPolygon(const basegfx::B2DPolyPolygon& rPolyPolygon, bool blockAA = false);
+    void DrawRegionBand(const RegionBand& rRegion);
+    void DrawTextureRect(const SalTwoRect& rPosAry);
+    //    void DrawTexture( OpenGLTexture& rTexture, const SalTwoRect& rPosAry, bool bInverted = false );
+    //    void DrawTransformedTexture( OpenGLTexture& rTexture, OpenGLTexture& rMask, const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX, const basegfx::B2DPoint& rY );
+    //    void DrawAlphaTexture( OpenGLTexture& rTexture, const SalTwoRect& rPosAry, bool bInverted, bool pPremultiplied );
+    //    void DrawTextureDiff( OpenGLTexture& rTexture, OpenGLTexture& rMask, const SalTwoRect& rPosAry, bool bInverted );
+    //    void DrawTextureWithMask( OpenGLTexture& rTexture, OpenGLTexture& rMask, const SalTwoRect& rPosAry );
+    //    void DrawBlendedTexture( OpenGLTexture& rTexture, OpenGLTexture& rMask, OpenGLTexture& rAlpha, const SalTwoRect& rPosAry );
+    //    void DrawMask( OpenGLTexture& rTexture, Color nMaskColor, const SalTwoRect& rPosAry );
+    void DrawLinearGradient(const Gradient& rGradient, const tools::Rectangle& rRect);
+    void DrawAxialGradient(const Gradient& rGradient, const tools::Rectangle& rRect);
+    void DrawRadialGradient(const Gradient& rGradient, const tools::Rectangle& rRect);
+    //    void DeferredTextDraw(OpenGLTexture const & rTexture, const Color nMaskColor, const SalTwoRect& rPosAry);
+
+    void FlushDeferredDrawing();
+    void FlushLinesOrTriangles(DrawShaderType eType, RenderParameters const& rParameters);
+
+public:
+    // get the width of the device
+    GLfloat GetWidth() const { return mpProvider ? mpProvider->GetWidth() : 1; }
+
+    // get the height of the device
+    GLfloat GetHeight() const { return mpProvider ? mpProvider->GetHeight() : 1; }
+
+    /**
+     * check whether this instance is used for offscreen (Virtual Device)
+     * rendering ie. does it need its own context.
+     */
+    bool IsOffscreen() const { return mpProvider == nullptr || mpProvider->IsOffScreen(); }
+
+    /// Oddly not all operations obey the XOR option.
+    enum XOROption
+    {
+        IGNORE_XOR,
+        IMPLEMENT_XOR
+    };
+
+    // initialize pre-draw state
+    void InitializePreDrawState(XOROption eOpt);
+
+    // operations to do before painting
+    void PreDraw(XOROption eOpt = IGNORE_XOR);
+
+    // operations to do after painting
+    void PostDraw();
+
+    void PostBatchDraw();
+
+protected:
+    bool AcquireContext(bool bForceCreate = false);
+    void ReleaseContext();
+
+public:
+    SkiaSalGraphicsImpl(SalGraphics& pParent, SalGeometryProvider* pProvider);
+    virtual ~SkiaSalGraphicsImpl() override;
+
+    virtual void Init() override;
+
+    virtual void DeInit() override;
+
+    virtual void freeResources() override;
+
+    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,
+                              const basegfx::B2DVector& rLineWidths, 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;
+
+    // CopyBits and DrawBitmap --> RasterOp and ClipRegion
+    // CopyBits() --> pSrcGraphics == NULL, then CopyBits on same Graphics
+    void DoCopyBits(const SalTwoRect& rPosAry, SkiaSalGraphicsImpl& rSrcImpl);
+
+    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;
+
+    /// queue an idle flush of contents of the back-buffer to the screen
+    void flush();
+
+public:
+    /// do flush of contents of the back-buffer to the screen & swap.
+    void doFlush();
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */