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diff --git a/vcl/inc/opengl/gdiimpl.hxx b/vcl/inc/opengl/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_OPENGLGDIIMPL_HXX
+#define INCLUDED_VCL_OPENGLGDIIMPL_HXX
+
+#include <vcl/dllapi.h>
+#include <vcl/opengl/OpenGLContext.hxx>
+
+#include <regionband.hxx>
+#include <salgeom.hxx>
+#include <salgdiimpl.hxx>
+#include <opengl/program.hxx>
+#include <opengl/texture.hxx>
+#include <opengl/RenderList.hxx>
+
+#include <memory>
+
+class SalFrame;
+class SalVirtualDevice;
+class OpenGLTests;
+
+namespace basegfx
+{
+class B2DTrapezoid;
+};
+
+namespace tools
+{
+    class Polygon;
+    class PolyPolygon;
+}
+
+struct TextureCombo
+{
+    std::unique_ptr<OpenGLTexture> mpTexture;
+    std::unique_ptr<OpenGLTexture> mpMask;
+};
+
+class OpenGLFlushIdle;
+
+class VCL_DLLPUBLIC OpenGLSalGraphicsImpl : public SalGraphicsImpl
+{
+    friend class OpenGLTests;
+protected:
+
+    /// This context is solely for blitting maOffscreenTex
+    rtl::Reference<OpenGLContext> mpWindowContext;
+
+    /// This context is whatever is most convenient to render
+    /// to maOffscreenTex with.
+    rtl::Reference<OpenGLContext> mpContext;
+
+    SalGraphics& mrParent;
+    /// Pointer to the SalFrame or SalVirtualDevice
+    SalGeometryProvider* mpProvider;
+    OpenGLProgram* mpProgram;
+
+    /// This idle handler is used to swap buffers after rendering.
+    std::unique_ptr<OpenGLFlushIdle> mpFlush;
+
+    // clipping
+    vcl::Region maClipRegion;
+    bool mbUseScissor;
+    bool mbUseStencil;
+
+    bool mbXORMode;
+
+    bool mbAcquiringOpenGLContext;
+
+    /**
+     * All rendering happens to this off-screen texture. For
+     * non-virtual devices, ie. windows - we will blit it and
+     * swapBuffers later.
+     */
+    OpenGLTexture maOffscreenTex;
+
+    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 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();
+
+    /// create a new context for rendering to the underlying window
+    virtual rtl::Reference<OpenGLContext> CreateWinContext() = 0;
+
+    /// check whether the given context can be used for off-screen rendering
+    static bool UseContext( const rtl::Reference<OpenGLContext> &pContext )
+    {
+        return pContext->isInitialized() &&  // not released by the OS etc.
+               pContext->isVCLOnly();
+    }
+
+public:
+    OpenGLSalGraphicsImpl(SalGraphics& pParent, SalGeometryProvider *pProvider);
+    virtual ~OpenGLSalGraphicsImpl () override;
+
+    rtl::Reference<OpenGLContext> GetOpenGLContext();
+
+    virtual void Init() override;
+
+    virtual void DeInit() override;
+
+    virtual void freeResources() override;
+
+    virtual OUString getRenderBackendName() const override { return "opengl"; }
+
+    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, // MM01
+                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, OpenGLSalGraphicsImpl &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;
+
+    virtual bool supportsOperation(OutDevSupportType eType) const 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: */