Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

11 files changed, 1199 insertions, 0 deletions

diff --git a/vcl/inc/headless/BitmapHelper.hxx b/vcl/inc/headless/BitmapHelper.hxx
new file mode 100644
index 0000000000..2b65984647
--- /dev/null
+++ b/vcl/inc/headless/BitmapHelper.hxx
@@ -0,0 +1,75 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <headless/CairoCommon.hxx>
+#include <headless/svpbmp.hxx>
+#include <basegfx/utils/systemdependentdata.hxx>
+
+class VCL_DLLPUBLIC BitmapHelper : public SurfaceHelper
+{
+private:
+#ifdef HAVE_CAIRO_FORMAT_RGB24_888
+    const bool m_bForceARGB32;
+#endif
+    SvpSalBitmap aTmpBmp;
+
+public:
+    explicit BitmapHelper(const SalBitmap& rSourceBitmap, const bool bForceARGB32 = false);
+    void mark_dirty();
+    unsigned char* getBits(sal_Int32& rStride);
+};
+
+class VCL_DLLPUBLIC MaskHelper : public SurfaceHelper
+{
+public:
+    explicit MaskHelper(const SalBitmap& rAlphaBitmap);
+};
+
+class SystemDependentData_BitmapHelper : public basegfx::SystemDependentData
+{
+private:
+    std::shared_ptr<BitmapHelper> maBitmapHelper;
+
+public:
+    SystemDependentData_BitmapHelper(std::shared_ptr<BitmapHelper> xBitmapHelper);
+
+    const std::shared_ptr<BitmapHelper>& getBitmapHelper() const { return maBitmapHelper; };
+    virtual sal_Int64 estimateUsageInBytes() const override;
+};
+
+class SystemDependentData_MaskHelper : public basegfx::SystemDependentData
+{
+private:
+    std::shared_ptr<MaskHelper> maMaskHelper;
+
+public:
+    SystemDependentData_MaskHelper(std::shared_ptr<MaskHelper> xMaskHelper);
+
+    const std::shared_ptr<MaskHelper>& getMaskHelper() const { return maMaskHelper; };
+    virtual sal_Int64 estimateUsageInBytes() const override;
+};
+
+VCL_DLLPUBLIC void tryToUseSourceBuffer(const SalBitmap& rSourceBitmap,
+                                        std::shared_ptr<BitmapHelper>& rSurface);
+VCL_DLLPUBLIC void tryToUseMaskBuffer(const SalBitmap& rMaskBitmap,
+                                      std::shared_ptr<MaskHelper>& rMask);
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/CairoCommon.hxx b/vcl/inc/headless/CairoCommon.hxx
new file mode 100644
index 0000000000..13e0398dd6
--- /dev/null
+++ b/vcl/inc/headless/CairoCommon.hxx
@@ -0,0 +1,269 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <cairo.h>
+
+#include <vcl/dllapi.h>
+#include <vcl/region.hxx>
+#include <vcl/salgtype.hxx>
+#include <vcl/vclenum.hxx>
+#include <vcl/BitmapBuffer.hxx>
+
+#include <com/sun/star/drawing/LineCap.hpp>
+
+#include <basegfx/utils/systemdependentdata.hxx>
+#include <basegfx/range/b2drange.hxx>
+#include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+#include <basegfx/polygon/b2dpolygon.hxx>
+
+#include <optional>
+#include <unordered_map>
+
+typedef struct _cairo cairo_t;
+typedef struct _cairo_surface cairo_surface_t;
+typedef struct _cairo_user_data_key cairo_user_data_key_t;
+
+class Gradient;
+class SalBitmap;
+struct SalGradient;
+
+VCL_DLLPUBLIC void dl_cairo_surface_set_device_scale(cairo_surface_t* surface, double x_scale,
+                                                     double y_scale);
+VCL_DLLPUBLIC void dl_cairo_surface_get_device_scale(cairo_surface_t* surface, double* x_scale,
+                                                     double* y_scale);
+
+VCL_DLLPUBLIC basegfx::B2DRange getFillDamage(cairo_t* cr);
+VCL_DLLPUBLIC basegfx::B2DRange getClipBox(cairo_t* cr);
+VCL_DLLPUBLIC basegfx::B2DRange getClippedFillDamage(cairo_t* cr);
+VCL_DLLPUBLIC basegfx::B2DRange getClippedStrokeDamage(cairo_t* cr);
+VCL_DLLPUBLIC basegfx::B2DRange getStrokeDamage(cairo_t* cr);
+
+class SystemDependentData_CairoPath final : public basegfx::SystemDependentData
+{
+private:
+    // the path data itself
+    cairo_path_t* mpCairoPath;
+
+    // all other values the path data  is based on and
+    // need to be compared with to check for data validity
+    bool mbNoJoin;
+    bool mbAntiAlias;
+    std::vector<double> maStroke;
+
+public:
+    SystemDependentData_CairoPath(size_t nSizeMeasure, cairo_t* cr, bool bNoJoin, bool bAntiAlias,
+                                  const std::vector<double>* pStroke); // MM01
+    virtual ~SystemDependentData_CairoPath() override;
+
+    // read access
+    cairo_path_t* getCairoPath() { return mpCairoPath; }
+    bool getNoJoin() const { return mbNoJoin; }
+    bool getAntiAlias() const { return mbAntiAlias; }
+    const std::vector<double>& getStroke() const { return maStroke; }
+
+    virtual sal_Int64 estimateUsageInBytes() const override;
+};
+
+VCL_DLLPUBLIC size_t AddPolygonToPath(cairo_t* cr, const basegfx::B2DPolygon& rPolygon,
+                                      const basegfx::B2DHomMatrix& rObjectToDevice, bool bPixelSnap,
+                                      bool bPixelSnapHairline);
+
+class VCL_DLLPUBLIC PixelSnapper
+{
+public:
+    basegfx::B2DPoint snap(const basegfx::B2DPolygon& rPolygon,
+                           const basegfx::B2DHomMatrix& rObjectToDevice,
+                           basegfx::B2DHomMatrix& rObjectToDeviceInv, sal_uInt32 nIndex);
+
+private:
+    basegfx::B2DPoint maPrevPoint, maCurrPoint, maNextPoint;
+    basegfx::B2ITuple maPrevTuple, maCurrTuple, maNextTuple;
+};
+
+VCL_DLLPUBLIC void add_polygon_path(cairo_t* cr, const basegfx::B2DPolyPolygon& rPolyPolygon,
+                                    const basegfx::B2DHomMatrix& rObjectToDevice, bool bPixelSnap);
+
+VCL_DLLPUBLIC cairo_format_t getCairoFormat(const BitmapBuffer& rBuffer);
+
+VCL_DLLPUBLIC std::optional<BitmapBuffer> FastConvert24BitRgbTo32BitCairo(const BitmapBuffer* pSrc);
+
+enum class PaintMode
+{
+    Over,
+    Xor
+};
+
+typedef void (*damageHandler)(void* handle, sal_Int32 nExtentsX, sal_Int32 nExtentsY,
+                              sal_Int32 nExtentsWidth, sal_Int32 nExtentsHeight);
+
+struct VCL_DLLPUBLIC DamageHandler
+{
+    void* handle;
+    damageHandler damaged;
+};
+
+struct VCL_DLLPUBLIC CairoCommon
+{
+    cairo_surface_t* m_pSurface;
+    basegfx::B2IVector m_aFrameSize;
+    vcl::Region m_aClipRegion;
+    std::optional<Color> m_oLineColor;
+    std::optional<Color> m_oFillColor;
+    PaintMode m_ePaintMode;
+    double m_fScale;
+
+    CairoCommon()
+        : m_pSurface(nullptr)
+        , m_oLineColor(Color(0x00, 0x00, 0x00))
+        , m_oFillColor(Color(0xFF, 0xFF, 0XFF))
+        , m_ePaintMode(PaintMode::Over)
+        , m_fScale(1.0)
+    {
+    }
+
+    static cairo_user_data_key_t* getDamageKey();
+
+    cairo_surface_t* getSurface() const { return m_pSurface; }
+
+    sal_uInt16 GetBitCount() const;
+
+    cairo_t* getCairoContext(bool bXorModeAllowed, bool bAntiAlias) const;
+    void releaseCairoContext(cairo_t* cr, bool bXorModeAllowed,
+                             const basegfx::B2DRange& rExtents) const;
+
+    cairo_t* createTmpCompatibleCairoContext() const;
+
+    static void applyColor(cairo_t* cr, Color rColor, double fTransparency = 0.0);
+    void clipRegion(cairo_t* cr);
+    static void clipRegion(cairo_t* cr, const vcl::Region& rClipRegion);
+
+    void SetXORMode(bool bSet, bool bInvertOnly);
+    void SetROPLineColor(SalROPColor nROPColor);
+    void SetROPFillColor(SalROPColor nROPColor);
+
+    void drawPixel(const std::optional<Color>& rLineColor, tools::Long nX, tools::Long nY,
+                   bool bAntiAlias);
+
+    static Color getPixel(cairo_surface_t* pSurface, tools::Long nX, tools::Long nY);
+
+    void drawLine(tools::Long nX1, tools::Long nY1, tools::Long nX2, tools::Long nY2,
+                  bool bAntiAlias);
+
+    void drawRect(double nX, double nY, double nWidth, double nHeight, bool bAntiAlias);
+
+    void drawPolygon(sal_uInt32 nPoints, const Point* pPtAry, bool bAntiAlias);
+
+    void drawPolyPolygon(sal_uInt32 nPoly, const sal_uInt32* pPoints, const Point** pPtAry,
+                         bool bAntiAlias);
+
+    void drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice,
+                         const basegfx::B2DPolyPolygon&, double fTransparency, bool bAntiAlias);
+
+    void drawPolyLine(sal_uInt32 nPoints, const Point* pPtAry, bool bAntiAlias);
+
+    bool drawPolyLine(const basegfx::B2DHomMatrix& rObjectToDevice,
+                      const basegfx::B2DPolygon& rPolyLine, double fTransparency, double fLineWidth,
+                      const std::vector<double>* pStroke, basegfx::B2DLineJoin eLineJoin,
+                      css::drawing::LineCap eLineCap, double fMiterMinimumAngle,
+                      bool bPixelSnapHairline, bool bAntiAlias);
+
+    bool drawAlphaRect(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight,
+                       sal_uInt8 nTransparency, bool bAntiAlias);
+
+    bool drawGradient(const tools::PolyPolygon& rPolyPolygon, const Gradient& rGradient,
+                      bool bAntiAlias);
+
+    bool implDrawGradient(basegfx::B2DPolyPolygon const& rPolyPolygon, SalGradient const& rGradient,
+                          bool bAntiAlias);
+
+    void copyWithOperator(const SalTwoRect& rTR, cairo_surface_t* source, cairo_operator_t eOp,
+                          bool bAntiAlias);
+
+    void copySource(const SalTwoRect& rTR, cairo_surface_t* source, bool bAntiAlias);
+
+    static basegfx::B2DRange renderSource(cairo_t* cr, const SalTwoRect& rTR,
+                                          cairo_surface_t* source);
+
+    void copyBitsCairo(const SalTwoRect& rTR, cairo_surface_t* pSourceSurface, bool bAntiAlias);
+
+    void invert(const basegfx::B2DPolygon& rPoly, SalInvert nFlags, bool bAntiAlias);
+
+    void invert(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight,
+                SalInvert nFlags, bool bAntiAlias);
+
+    void invert(sal_uInt32 nPoints, const Point* pPtAry, SalInvert nFlags, bool bAntiAlias);
+
+    void drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap, bool bAntiAlias);
+
+    bool drawAlphaBitmap(const SalTwoRect& rTR, const SalBitmap& rSourceBitmap,
+                         const SalBitmap& rAlphaBitmap, bool bAntiAlias);
+
+    bool drawTransformedBitmap(const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX,
+                               const basegfx::B2DPoint& rY, const SalBitmap& rSourceBitmap,
+                               const SalBitmap* pAlphaBitmap, double fAlpha, bool bAntiAlias);
+
+    void drawMask(const SalTwoRect& rTR, const SalBitmap& rSalBitmap, Color nMaskColor,
+                  bool bAntiAlias);
+
+    std::shared_ptr<SalBitmap> getBitmap(tools::Long nX, tools::Long nY, tools::Long nWidth,
+                                         tools::Long nHeight);
+
+    static cairo_surface_t* createCairoSurface(const BitmapBuffer* pBuffer);
+
+    static bool supportsOperation(OutDevSupportType eType);
+    static bool hasFastDrawTransformedBitmap();
+
+private:
+    void doXorOnRelease(sal_Int32 nExtentsLeft, sal_Int32 nExtentsTop, sal_Int32 nExtentsRight,
+                        sal_Int32 nExtentsBottom, cairo_surface_t* const surface,
+                        sal_Int32 nWidth) const;
+};
+
+class VCL_DLLPUBLIC SurfaceHelper
+{
+private:
+    cairo_surface_t* pSurface;
+    std::unordered_map<sal_uInt64, cairo_surface_t*> maDownscaled;
+
+    SurfaceHelper(const SurfaceHelper&) = delete;
+    SurfaceHelper& operator=(const SurfaceHelper&) = delete;
+
+    cairo_surface_t* implCreateOrReuseDownscale(unsigned long nTargetWidth,
+                                                unsigned long nTargetHeight);
+
+protected:
+    cairo_surface_t* implGetSurface() const { return pSurface; }
+    void implSetSurface(cairo_surface_t* pNew) { pSurface = pNew; }
+
+    bool isTrivial() const;
+
+public:
+    explicit SurfaceHelper();
+    ~SurfaceHelper();
+
+    cairo_surface_t* getSurface(unsigned long nTargetWidth = 0,
+                                unsigned long nTargetHeight = 0) const;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/SvpGraphicsBackend.hxx b/vcl/inc/headless/SvpGraphicsBackend.hxx
new file mode 100644
index 0000000000..6a68899c8a
--- /dev/null
+++ b/vcl/inc/headless/SvpGraphicsBackend.hxx
@@ -0,0 +1,139 @@
+/* -*- 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 .
+ */
+
+#pragma once
+
+#include <vcl/dllapi.h>
+#include <tools/long.hxx>
+#include <tools/color.hxx>
+#include <salgdiimpl.hxx>
+#include <salgdi.hxx>
+
+#include <headless/CairoCommon.hxx>
+
+class VCL_DLLPUBLIC SvpGraphicsBackend final : public SalGraphicsImpl
+{
+    CairoCommon& m_rCairoCommon;
+
+public:
+    SvpGraphicsBackend(CairoCommon& rCairoCommon);
+
+    void Init() override;
+
+    void freeResources() override;
+
+    OUString getRenderBackendName() const override { return "svp"; }
+
+    void setClipRegion(vcl::Region const& rRegion) override;
+    void ResetClipRegion() override;
+
+    sal_uInt16 GetBitCount() const override;
+
+    tools::Long GetGraphicsWidth() const override;
+
+    void SetLineColor() override;
+    void SetLineColor(Color nColor) override;
+    void SetFillColor() override;
+    void SetFillColor(Color nColor) override;
+    void SetXORMode(bool bSet, bool bInvertOnly) override;
+    void SetROPLineColor(SalROPColor nROPColor) override;
+    void SetROPFillColor(SalROPColor nROPColor) override;
+
+    void drawPixel(tools::Long nX, tools::Long nY) override;
+    void drawPixel(tools::Long nX, tools::Long nY, Color nColor) override;
+
+    void drawLine(tools::Long nX1, tools::Long nY1, tools::Long nX2, tools::Long nY2) override;
+    void drawRect(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight) override;
+    void drawPolyLine(sal_uInt32 nPoints, const Point* pPointArray) override;
+    void drawPolygon(sal_uInt32 nPoints, const Point* pPointArray) override;
+    void drawPolyPolygon(sal_uInt32 nPoly, const sal_uInt32* pPoints,
+                         const Point** pPointArray) override;
+
+    void drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice,
+                         const basegfx::B2DPolyPolygon&, double fTransparency) override;
+
+    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;
+
+    bool drawPolyLineBezier(sal_uInt32 nPoints, const Point* pPointArray,
+                            const PolyFlags* pFlagArray) override;
+
+    bool drawPolygonBezier(sal_uInt32 nPoints, const Point* pPointArray,
+                           const PolyFlags* pFlagArray) override;
+
+    bool drawPolyPolygonBezier(sal_uInt32 nPoly, const sal_uInt32* pPoints,
+                               const Point* const* pPointArray,
+                               const PolyFlags* const* pFlagArray) override;
+
+    void copyArea(tools::Long nDestX, tools::Long nDestY, tools::Long nSrcX, tools::Long nSrcY,
+                  tools::Long nSrcWidth, tools::Long nSrcHeight, bool bWindowInvalidate) override;
+
+    void copyBits(const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics) override;
+
+    void drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap) override;
+
+    void drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,
+                    const SalBitmap& rMaskBitmap) override;
+
+    void drawMask(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap,
+                  Color nMaskColor) override;
+
+    std::shared_ptr<SalBitmap> getBitmap(tools::Long nX, tools::Long nY, tools::Long nWidth,
+                                         tools::Long nHeight) override;
+
+    Color getPixel(tools::Long nX, tools::Long nY) override;
+
+    void invert(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight,
+                SalInvert nFlags) override;
+
+    void invert(sal_uInt32 nPoints, const Point* pPtAry, SalInvert nFlags) override;
+
+    bool drawEPS(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight,
+                 void* pPtr, sal_uInt32 nSize) override;
+
+    bool blendBitmap(const SalTwoRect&, const SalBitmap& rBitmap) override;
+
+    bool blendAlphaBitmap(const SalTwoRect&, const SalBitmap& rSrcBitmap,
+                          const SalBitmap& rMaskBitmap, const SalBitmap& rAlphaBitmap) override;
+
+    bool drawAlphaBitmap(const SalTwoRect&, const SalBitmap& rSourceBitmap,
+                         const SalBitmap& rAlphaBitmap) override;
+
+    bool drawTransformedBitmap(const basegfx::B2DPoint& rNull, const basegfx::B2DPoint& rX,
+                               const basegfx::B2DPoint& rY, const SalBitmap& rSourceBitmap,
+                               const SalBitmap* pAlphaBitmap, double fAlpha) override;
+
+    bool hasFastDrawTransformedBitmap() const override;
+
+    bool drawAlphaRect(tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight,
+                       sal_uInt8 nTransparency) override;
+
+    bool drawGradient(const tools::PolyPolygon& rPolygon, const Gradient& rGradient) override;
+    bool implDrawGradient(basegfx::B2DPolyPolygon const& rPolyPolygon,
+                          SalGradient const& rGradient) override;
+
+    bool supportsOperation(OutDevSupportType eType) const override;
+
+    void drawBitmapBuffer(const SalTwoRect& rPosAry, const BitmapBuffer* pBuffer,
+                          cairo_operator_t eOp);
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpbmp.hxx b/vcl/inc/headless/svpbmp.hxx
new file mode 100644
index 0000000000..b7fdb230f9
--- /dev/null
+++ b/vcl/inc/headless/svpbmp.hxx
@@ -0,0 +1,75 @@
+/* -*- 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_HEADLESS_SVPBMP_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPBMP_HXX
+
+#include <sal/config.h>
+
+#include <salbmp.hxx>
+#include <basegfx/utils/systemdependentdata.hxx>
+#include <optional>
+
+class VCL_DLLPUBLIC SvpSalBitmap final : public SalBitmap, public basegfx::SystemDependentDataHolder // MM02
+{
+    std::optional<BitmapBuffer> moDIB;
+public:
+             SvpSalBitmap();
+    virtual ~SvpSalBitmap() override;
+
+    bool        ImplCreate(const Size& rSize,
+                           vcl::PixelFormat ePixelFormat,
+                           const BitmapPalette& rPalette,
+                           bool bClear);
+
+    // SalBitmap
+    virtual bool            Create(const Size& rSize,
+                                   vcl::PixelFormat ePixelFormat,
+                                   const BitmapPalette& rPalette) override;
+    virtual bool            Create( const SalBitmap& rSalBmp ) override;
+    virtual bool            Create( const SalBitmap& rSalBmp,
+                                    SalGraphics* pGraphics ) override;
+    virtual bool            Create(const SalBitmap& rSalBmp,
+                                   vcl::PixelFormat eNewPixelFormat) override;
+    virtual bool            Create( const css::uno::Reference< css::rendering::XBitmapCanvas >& rBitmapCanvas,
+                                    Size& rSize,
+                                    bool bMask = false ) override;
+    void                    Create(const std::optional<BitmapBuffer> & pBuf);
+    const BitmapBuffer*     GetBuffer() const
+    {
+        return moDIB ? &*moDIB : nullptr;
+    }
+    virtual void            Destroy() final override;
+    virtual Size            GetSize() const override;
+    virtual sal_uInt16      GetBitCount() const override;
+
+    virtual BitmapBuffer*   AcquireBuffer( BitmapAccessMode nMode ) override;
+    virtual void            ReleaseBuffer( BitmapBuffer* pBuffer, BitmapAccessMode nMode ) override;
+    virtual bool            GetSystemData( BitmapSystemData& rData ) override;
+
+    virtual bool            ScalingSupported() const override;
+    virtual bool            Scale( const double& rScaleX, const double& rScaleY, BmpScaleFlag nScaleFlag ) override;
+    virtual bool            Replace( const Color& rSearchColor, const Color& rReplaceColor, sal_uInt8 nTol ) override;
+
+    virtual const basegfx::SystemDependentDataHolder* accessSystemDependentDataHolder() const override;
+};
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPBMP_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpdata.hxx b/vcl/inc/headless/svpdata.hxx
new file mode 100644
index 0000000000..f995d7ef39
--- /dev/null
+++ b/vcl/inc/headless/svpdata.hxx
@@ -0,0 +1,25 @@
+/* -*- 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 <unx/gendata.hxx>
+
+class SvpSalData : public GenericUnixSalData
+{
+public:
+    explicit SvpSalData()
+        : GenericUnixSalData()
+    {
+    }
+    virtual void ErrorTrapPush() override {}
+    virtual bool ErrorTrapPop(bool /*bIgnoreError*/ = true) override { return false; }
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpdummies.hxx b/vcl/inc/headless/svpdummies.hxx
new file mode 100644
index 0000000000..92958f8d55
--- /dev/null
+++ b/vcl/inc/headless/svpdummies.hxx
@@ -0,0 +1,64 @@
+/* -*- 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_HEADLESS_SVPDUMMIES_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPDUMMIES_HXX
+
+#include <vcl/sysdata.hxx>
+#include <unx/gensys.h>
+#include <salobj.hxx>
+
+class SalGraphics;
+
+class SvpSalObject final : public SalObject
+{
+    SystemEnvData m_aSystemChildData;
+
+public:
+    virtual ~SvpSalObject() override;
+
+    // override all pure virtual methods
+    virtual void                    ResetClipRegion() override;
+    virtual void                    BeginSetClipRegion( sal_uInt32 nRects ) override;
+    virtual void                    UnionClipRegion( tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight ) override;
+    virtual void                    EndSetClipRegion() override;
+
+    virtual void                    SetPosSize( tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight ) override;
+    virtual void                    Show( bool bVisible ) override;
+
+    virtual const SystemEnvData*    GetSystemData() const override;
+};
+
+class SvpSalSystem : public SalGenericSystem
+{
+public:
+    SvpSalSystem() {}
+    virtual ~SvpSalSystem() override;
+    // get info about the display
+    virtual unsigned int GetDisplayScreenCount() override;
+    virtual AbsoluteScreenPixelRectangle GetDisplayScreenPosSizePixel( unsigned int nScreen ) override;
+
+    virtual int ShowNativeDialog( const OUString& rTitle,
+                                  const OUString& rMessage,
+                                  const std::vector< OUString >& rButtons ) override;
+};
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPDUMMIES_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpframe.hxx b/vcl/inc/headless/svpframe.hxx
new file mode 100644
index 0000000000..3789e44745
--- /dev/null
+++ b/vcl/inc/headless/svpframe.hxx
@@ -0,0 +1,145 @@
+/* -*- 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_HEADLESS_SVPFRAME_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPFRAME_HXX
+
+#include <vcl/sysdata.hxx>
+
+#include <salframe.hxx>
+
+#include <vector>
+
+#ifdef IOS
+#include <quartz/salgdi.h>
+#define SvpSalInstance AquaSalInstance
+#define SvpSalGraphics AquaSalGraphics
+#endif
+
+class SvpSalInstance;
+class SvpSalGraphics;
+
+class SvpSalFrame : public SalFrame
+{
+    SvpSalInstance*                     m_pInstance;
+    SvpSalFrame*                        m_pParent;       // pointer to parent frame
+    std::vector< SvpSalFrame* >         m_aChildren;     // Vector of child frames
+    SalFrameStyleFlags                  m_nStyle;
+    bool                                m_bVisible;
+#ifndef IOS
+    cairo_surface_t*                    m_pSurface;
+#endif
+    tools::Long                                m_nMinWidth;
+    tools::Long                                m_nMinHeight;
+    tools::Long                                m_nMaxWidth;
+    tools::Long                                m_nMaxHeight;
+
+    SystemEnvData                       m_aSystemChildData;
+
+    std::vector< SvpSalGraphics* >      m_aGraphics;
+
+    static SvpSalFrame*       s_pFocusFrame;
+    OUString m_sTitle;
+
+public:
+    SvpSalFrame( SvpSalInstance* pInstance,
+                 SalFrame* pParent,
+                 SalFrameStyleFlags nSalFrameStyle );
+    virtual ~SvpSalFrame() override;
+
+    void GetFocus();
+    void LoseFocus();
+    void PostPaint() const;
+
+    const OUString& title() const { return m_sTitle; }
+    SalFrameStyleFlags style() const { return m_nStyle; }
+    bool isVisible() const { return m_bVisible; }
+    bool hasFocus() const { return s_pFocusFrame == this; }
+
+    // SalFrame
+    virtual SalGraphics*        AcquireGraphics() override;
+    virtual void                ReleaseGraphics( SalGraphics* pGraphics ) override;
+
+    virtual bool                PostEvent(std::unique_ptr<ImplSVEvent> pData) override;
+
+    virtual void                SetTitle( const OUString& rTitle ) override;
+    virtual void                SetIcon( sal_uInt16 nIcon ) override;
+    virtual void                SetMenu( SalMenu* pMenu ) override;
+
+    virtual void                SetExtendedFrameStyle( SalExtStyle nExtStyle ) override;
+    virtual void                Show( bool bVisible, bool bNoActivate = false ) override;
+    virtual void                SetMinClientSize( tools::Long nWidth, tools::Long nHeight ) override;
+    virtual void                SetMaxClientSize( tools::Long nWidth, tools::Long nHeight ) override;
+    virtual void                SetPosSize( tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight, sal_uInt16 nFlags ) override;
+    virtual void                GetClientSize( tools::Long& rWidth, tools::Long& rHeight ) override;
+    virtual void                GetWorkArea( AbsoluteScreenPixelRectangle& rRect ) override;
+    virtual SalFrame*           GetParent() const override;
+    virtual void SetWindowState(const vcl::WindowData*) override;
+    virtual bool GetWindowState(vcl::WindowData*) override;
+    virtual void                ShowFullScreen( bool bFullScreen, sal_Int32 nDisplay ) override;
+    virtual void                StartPresentation( bool bStart ) override;
+    virtual void                SetAlwaysOnTop( bool bOnTop ) override;
+    virtual void                ToTop( SalFrameToTop nFlags ) override;
+    virtual void                SetPointer( PointerStyle ePointerStyle ) override;
+    virtual void                CaptureMouse( bool bMouse ) override;
+    virtual void                SetPointerPos( tools::Long nX, tools::Long nY ) override;
+    using SalFrame::Flush;
+    virtual void                Flush() override;
+    virtual void                SetInputContext( SalInputContext* pContext ) override;
+    virtual void                EndExtTextInput( EndExtTextInputFlags nFlags ) override;
+    virtual OUString            GetKeyName( sal_uInt16 nKeyCode ) override;
+    virtual bool                MapUnicodeToKeyCode( sal_Unicode aUnicode, LanguageType aLangType, vcl::KeyCode& rKeyCode ) override;
+    virtual LanguageType        GetInputLanguage() override;
+    virtual void                UpdateSettings( AllSettings& rSettings ) override;
+    virtual void                Beep() override;
+    virtual const SystemEnvData* GetSystemData() const override;
+    virtual SalPointerState     GetPointerState() override;
+    virtual KeyIndicatorState   GetIndicatorState() override;
+    virtual void                SimulateKeyPress( sal_uInt16 nKeyCode ) override;
+    virtual void                SetParent( SalFrame* pNewParent ) override;
+    virtual void                SetPluginParent( SystemParentData* pNewParent ) override;
+    virtual void                ResetClipRegion() override;
+    virtual void                BeginSetClipRegion( sal_uInt32 nRects ) override;
+    virtual void                UnionClipRegion( tools::Long nX, tools::Long nY, tools::Long nWidth, tools::Long nHeight ) override;
+    virtual void                EndSetClipRegion() override;
+
+    /*TODO: functional implementation */
+    virtual void                SetScreenNumber( unsigned int ) override {}
+    virtual void                SetApplicationID(const OUString &) override {}
+
+private:
+    basegfx::B2IVector GetSurfaceFrameSize() const;
+};
+
+template <typename charT, typename traits>
+inline std::basic_ostream<charT, traits>& operator<<(std::basic_ostream<charT, traits>& stream,
+                                                     const SvpSalFrame& frame)
+{
+    stream << &frame << " (vis " << frame.isVisible() <<  " focus " << frame.hasFocus();
+    stream << " style " << std::hex << std::setfill('0') << std::setw(8) << static_cast<sal_uInt32>(frame.style());
+    OUString sTitle = frame.title();
+    if (!sTitle.isEmpty())
+        stream << " '" << sTitle << "'";
+    stream << ")";
+    return stream;
+}
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPFRAME_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpgdi.hxx b/vcl/inc/headless/svpgdi.hxx
new file mode 100644
index 0000000000..a68c1b974c
--- /dev/null
+++ b/vcl/inc/headless/svpgdi.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 .
+ */
+
+#pragma once
+
+#ifdef IOS
+#error This file is not for iOS
+#endif
+
+#include <sal/config.h>
+
+#include <osl/endian.h>
+#include <vcl/sysdata.hxx>
+#include <config_cairo_canvas.h>
+
+#include <salgdi.hxx>
+#include <sallayout.hxx>
+#include <unx/cairotextrender.hxx>
+#include <font/FontMetricData.hxx>
+
+#include <headless/SvpGraphicsBackend.hxx>
+#include <headless/CairoCommon.hxx>
+
+struct BitmapBuffer;
+class FreetypeFont;
+
+class VCL_DLLPUBLIC SvpSalGraphics : public SalGraphicsAutoDelegateToImpl
+{
+    CairoCommon m_aCairoCommon;
+    CairoTextRender m_aTextRenderImpl;
+    std::unique_ptr<SvpGraphicsBackend> m_pBackend;
+
+public:
+    void setSurface(cairo_surface_t* pSurface, const basegfx::B2IVector& rSize);
+    cairo_surface_t* getSurface() const { return m_aCairoCommon.m_pSurface; }
+    static cairo_user_data_key_t* getDamageKey()
+    {
+        return CairoCommon::getDamageKey();
+    }
+
+protected:
+
+    cairo_t* createTmpCompatibleCairoContext() const;
+
+public:
+    SvpSalGraphics();
+    virtual ~SvpSalGraphics() override;
+
+    virtual SalGraphicsImpl* GetImpl() const override { return m_pBackend.get(); }
+    std::unique_ptr<SvpGraphicsBackend> const& getSvpBackend() { return m_pBackend; }
+
+    virtual void            GetResolution( sal_Int32& rDPIX, sal_Int32& rDPIY ) override;
+
+    virtual void            SetTextColor( Color nColor ) override;
+    virtual void            SetFont(LogicalFontInstance*, int nFallbackLevel) override;
+    virtual void            GetFontMetric( FontMetricDataRef&, int nFallbackLevel ) override;
+    virtual FontCharMapRef  GetFontCharMap() const override;
+    virtual bool GetFontCapabilities(vcl::FontCapabilities &rFontCapabilities) const override;
+    virtual void            GetDevFontList( vcl::font::PhysicalFontCollection* ) override;
+    virtual void ClearDevFontCache() override;
+    virtual bool            AddTempDevFont( vcl::font::PhysicalFontCollection*, const OUString& rFileURL, const OUString& rFontName ) override;
+    virtual std::unique_ptr<GenericSalLayout>
+                            GetTextLayout(int nFallbackLevel) override;
+    virtual void            DrawTextLayout( const GenericSalLayout& ) override;
+
+    virtual bool            ShouldDownscaleIconsAtSurface(double* pScaleOut) const override;
+
+    virtual SystemGraphicsData GetGraphicsData() const override;
+
+#if ENABLE_CAIRO_CANVAS
+    virtual bool            SupportsCairo() const override;
+    virtual cairo::SurfaceSharedPtr CreateSurface(const cairo::CairoSurfaceSharedPtr& rSurface) const override;
+    virtual cairo::SurfaceSharedPtr CreateSurface(const OutputDevice& rRefDevice, int x, int y, int width, int height) const override;
+    virtual cairo::SurfaceSharedPtr CreateBitmapSurface(const OutputDevice& rRefDevice, const BitmapSystemData& rData, const Size& rSize) const override;
+    virtual css::uno::Any   GetNativeSurfaceHandle(cairo::SurfaceSharedPtr& rSurface, const basegfx::B2ISize& rSize) const override;
+#endif // ENABLE_CAIRO_CANVAS
+
+    cairo_t* getCairoContext() const
+    {
+        return m_aCairoCommon.getCairoContext(/*bXorModeAllowed*/false, getAntiAlias());
+    }
+
+    void clipRegion(cairo_t* cr)
+    {
+        m_aCairoCommon.clipRegion(cr);
+    }
+
+    void copySource(const SalTwoRect& rTR, cairo_surface_t* source)
+    {
+        m_aCairoCommon.copySource(rTR, source, getAntiAlias());
+    }
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpinst.hxx b/vcl/inc/headless/svpinst.hxx
new file mode 100644
index 0000000000..efe32761f5
--- /dev/null
+++ b/vcl/inc/headless/svpinst.hxx
@@ -0,0 +1,192 @@
+/* -*- 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_HEADLESS_SVPINST_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPINST_HXX
+
+#include <osl/thread.hxx>
+#include <osl/conditn.hxx>
+#include <salinst.hxx>
+#include <saltimer.hxx>
+#include <salusereventlist.hxx>
+#include <unx/geninst.h>
+#include <unx/genprn.h>
+
+#include <condition_variable>
+#include <mutex>
+#include <queue>
+
+#include <sys/time.h>
+
+#ifdef IOS
+#define SvpSalInstance AquaSalInstance
+#endif
+
+class SvpSalInstance;
+class SvpSalTimer final : public SalTimer
+{
+    SvpSalInstance* m_pInstance;
+public:
+    SvpSalTimer( SvpSalInstance* pInstance ) : m_pInstance( pInstance ) {}
+    virtual ~SvpSalTimer() override;
+
+    // override all pure virtual methods
+    virtual void Start( sal_uInt64 nMS ) override;
+    virtual void Stop() override;
+};
+
+class SvpSalFrame;
+class GenPspGraphics;
+
+enum class SvpRequest
+{
+    NONE,
+    MainThreadDispatchOneEvent,
+    MainThreadDispatchAllEvents,
+};
+
+class SvpSalYieldMutex final : public SalYieldMutex
+{
+private:
+    // note: these members might as well live in SvpSalInstance, but there is
+    // at least one subclass of SvpSalInstance (GTK3) that doesn't use them.
+    friend class SvpSalInstance;
+    // members for communication from main thread to non-main thread
+    std::mutex              m_FeedbackMutex;
+    std::queue<bool>        m_FeedbackPipe;
+    std::condition_variable m_FeedbackCV;
+    osl::Condition          m_NonMainWaitingYieldCond;
+    // members for communication from non-main thread to main thread
+    bool                    m_bNoYieldLock = false; // accessed only on main thread
+    std::mutex              m_WakeUpMainMutex; // guard m_wakeUpMain & m_Request
+    std::condition_variable m_WakeUpMainCond;
+    bool                    m_wakeUpMain = false;
+    SvpRequest              m_Request = SvpRequest::NONE;
+
+    virtual void            doAcquire( sal_uInt32 nLockCount ) override;
+    virtual sal_uInt32      doRelease( bool bUnlockAll ) override;
+
+public:
+    SvpSalYieldMutex();
+    virtual ~SvpSalYieldMutex() override;
+
+    virtual bool IsCurrentThread() const override;
+};
+
+// NOTE: the functions IsMainThread, DoYield and Wakeup *require* the use of
+// SvpSalYieldMutex; if a subclass uses something else it must override these
+// (Wakeup is only called by SvpSalTimer and SvpSalFrame)
+class VCL_DLLPUBLIC SvpSalInstance : public SalGenericInstance, public SalUserEventList
+{
+    timeval                 m_aTimeout;
+    sal_uLong               m_nTimeoutMS;
+    oslThreadIdentifier     m_MainThread;
+
+    virtual void            TriggerUserEventProcessing() override;
+    virtual void            ProcessEvent( SalUserEvent aEvent ) override;
+    bool ImplYield(bool bWait, bool bHandleAllCurrentEvents);
+
+public:
+    static SvpSalInstance*  s_pDefaultInstance;
+
+    SvpSalInstance( std::unique_ptr<SalYieldMutex> pMutex );
+    virtual ~SvpSalInstance() override;
+
+    void                    CloseWakeupPipe();
+    void                    Wakeup(SvpRequest request = SvpRequest::NONE);
+
+    void                    StartTimer( sal_uInt64 nMS );
+    void                    StopTimer();
+
+    inline void             registerFrame( SalFrame* pFrame );
+    inline void             deregisterFrame( SalFrame* pFrame );
+
+    bool                    CheckTimeout( bool bExecuteTimers = true );
+
+    // Frame
+    virtual SalFrame*       CreateChildFrame( SystemParentData* pParent, SalFrameStyleFlags nStyle ) override;
+    virtual SalFrame*       CreateFrame( SalFrame* pParent, SalFrameStyleFlags nStyle ) override;
+    virtual void            DestroyFrame( SalFrame* pFrame ) override;
+
+    // Object (System Child Window)
+    virtual SalObject*      CreateObject( SalFrame* pParent, SystemWindowData* pWindowData, bool bShow ) override;
+    virtual void            DestroyObject( SalObject* pObject ) override;
+
+    // VirtualDevice
+    // nDX and nDY in Pixel
+    // nBitCount: 0 == Default(=as window) / 1 == Mono
+    // pData allows for using a system dependent graphics or device context
+    virtual std::unique_ptr<SalVirtualDevice>
+                            CreateVirtualDevice( SalGraphics& rGraphics,
+                                                     tools::Long &nDX, tools::Long &nDY,
+                                                     DeviceFormat eFormat, const SystemGraphicsData *pData = nullptr ) override;
+
+    // Printer
+    // pSetupData->mpDriverData can be 0
+    // pSetupData must be updated with the current
+    // JobSetup
+    virtual SalInfoPrinter* CreateInfoPrinter( SalPrinterQueueInfo* pQueueInfo,
+                                               ImplJobSetup* pSetupData ) override;
+    virtual void            DestroyInfoPrinter( SalInfoPrinter* pPrinter ) override;
+    virtual std::unique_ptr<SalPrinter> CreatePrinter( SalInfoPrinter* pInfoPrinter ) override;
+
+    virtual void            GetPrinterQueueInfo( ImplPrnQueueList* pList ) override;
+    virtual void            GetPrinterQueueState( SalPrinterQueueInfo* pInfo ) override;
+    virtual OUString        GetDefaultPrinter() override;
+    virtual void            PostPrintersChanged() override;
+
+    // SalTimer
+    virtual SalTimer*       CreateSalTimer() override;
+    // SalSystem
+    virtual SalSystem*      CreateSalSystem() override;
+    // SalBitmap
+    virtual std::shared_ptr<SalBitmap> CreateSalBitmap() override;
+
+    // wait next event and dispatch
+    // must returned by UserEvent (SalFrame::PostEvent)
+    // and timer
+    virtual bool            DoYield(bool bWait, bool bHandleAllCurrentEvents) override;
+    virtual bool            AnyInput( VclInputFlags nType ) override;
+    virtual bool            IsMainThread() const override;
+    virtual void            updateMainThread() override;
+
+    virtual OUString        GetConnectionIdentifier() override;
+
+    virtual void            AddToRecentDocumentList(const OUString& rFileUrl, const OUString& rMimeType, const OUString& rDocumentService) override;
+
+    virtual std::unique_ptr<GenPspGraphics> CreatePrintGraphics() override;
+
+    virtual const cairo_font_options_t* GetCairoFontOptions() override;
+};
+
+inline void SvpSalInstance::registerFrame( SalFrame* pFrame )
+{
+    insertFrame( pFrame );
+}
+
+inline void SvpSalInstance::deregisterFrame( SalFrame* pFrame )
+{
+    eraseFrame( pFrame );
+}
+
+VCL_DLLPUBLIC cairo_surface_t* get_underlying_cairo_surface(const VirtualDevice& rDevice);
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPINST_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpprn.hxx b/vcl/inc/headless/svpprn.hxx
new file mode 100644
index 0000000000..e1dd1e15f9
--- /dev/null
+++ b/vcl/inc/headless/svpprn.hxx
@@ -0,0 +1,39 @@
+/* -*- 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_HEADLESS_SVPPRN_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPPRN_HXX
+
+#include <unx/genprn.h>
+
+class SvpSalInfoPrinter final : public PspSalInfoPrinter
+{
+public:
+    virtual bool Setup(weld::Window* pFrame, ImplJobSetup* pSetupData) override;
+};
+
+class SvpSalPrinter final : public PspSalPrinter
+{
+public:
+    SvpSalPrinter(SalInfoPrinter* pInfoPrinter);
+};
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPPRN_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/vcl/inc/headless/svpvd.hxx b/vcl/inc/headless/svpvd.hxx
new file mode 100644
index 0000000000..f1666b689a
--- /dev/null
+++ b/vcl/inc/headless/svpvd.hxx
@@ -0,0 +1,66 @@
+/* -*- 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_HEADLESS_SVPVD_HXX
+#define INCLUDED_VCL_INC_HEADLESS_SVPVD_HXX
+
+#include <salvd.hxx>
+#include <basegfx/vector/b2ivector.hxx>
+
+#include <vector>
+
+class SvpSalGraphics;
+typedef struct _cairo_surface cairo_surface_t;
+
+class VCL_DLLPUBLIC SvpSalVirtualDevice : public SalVirtualDevice
+{
+    cairo_surface_t*                    m_pRefSurface;
+    cairo_surface_t*                    m_pSurface;
+    bool                                m_bOwnsSurface; // nearly always true, except for edge case of tdf#127529
+    basegfx::B2IVector                  m_aFrameSize;
+    std::vector< SvpSalGraphics* >      m_aGraphics;
+
+    bool CreateSurface(tools::Long nNewDX, tools::Long nNewDY, sal_uInt8 *const pBuffer);
+
+protected:
+    SvpSalGraphics* AddGraphics(SvpSalGraphics* aGraphics);
+
+public:
+    SvpSalVirtualDevice(cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget);
+    virtual ~SvpSalVirtualDevice() override;
+
+    // SalVirtualDevice
+    virtual SalGraphics*    AcquireGraphics() override;
+    virtual void            ReleaseGraphics( SalGraphics* pGraphics ) override;
+
+    virtual bool        SetSize( tools::Long nNewDX, tools::Long nNewDY ) override;
+    virtual bool        SetSizeUsingBuffer( tools::Long nNewDX, tools::Long nNewDY,
+                                            sal_uInt8 * pBuffer
+                                          ) override;
+
+    cairo_surface_t* GetSurface() const { return m_pSurface; }
+
+    // SalGeometryProvider
+    virtual tools::Long GetWidth() const override;
+    virtual tools::Long GetHeight() const override;
+};
+
+#endif // INCLUDED_VCL_INC_HEADLESS_SVPVD_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */