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diff --git a/vcl/backendtest/outputdevice/polygon.cxx b/vcl/backendtest/outputdevice/polygon.cxx
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+++ b/vcl/backendtest/outputdevice/polygon.cxx
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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/.
+ *
+ */
+
+#include <test/outputdevice.hxx>
+
+namespace vcl::test
+{
+namespace
+{
+void drawPolygonOffset(OutputDevice& rDevice, tools::Rectangle const& rRect, int nOffset,
+ int nFix = 0)
+{
+ // Note: According to https://lists.freedesktop.org/archives/libreoffice/2019-November/083709.html
+ // filling polygons always skips the right-most and bottom-most pixels, in order to avoid
+ // overlaps when drawing adjacent polygons. Specifying nFix = 1 allows to visually compensate
+ // for this by making the polygon explicitly larger.
+ tools::Polygon aPolygon(4);
+ int nMidOffset = rRect.GetWidth() / 2;
+ aPolygon.SetPoint(Point(rRect.Left() + nOffset - (nOffset+1)/2, rRect.Top() + nOffset - 1), 0);
+ aPolygon.SetPoint(Point(rRect.Right() - nMidOffset + nFix - nOffset/3, rRect.Top() + nOffset - 1), 1);
+ aPolygon.SetPoint(Point(rRect.Right() - nMidOffset + nFix - nOffset/3, rRect.Bottom() - nOffset + nFix + 1), 2);
+ aPolygon.SetPoint(Point(rRect.Left() + nOffset - (nOffset+1)/2, rRect.Bottom() - nOffset + nFix + 1), 3);
+ aPolygon.Optimize(PolyOptimizeFlags::CLOSE);
+
+ rDevice.DrawPolygon(aPolygon);
+}
+
+} // end anonymous namespace
+
+Bitmap OutputDeviceTestPolygon::setupRectangle(bool bEnableAA)
+{
+ initialSetup(13, 13, constBackgroundColor, bEnableAA);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 2);
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 5);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupFilledRectangle(bool useLineColor)
+{
+ initialSetup(13, 13, constBackgroundColor);
+
+ if (useLineColor)
+ mpVirtualDevice->SetLineColor(constLineColor);
+ else
+ mpVirtualDevice->SetLineColor();
+ mpVirtualDevice->SetFillColor(constFillColor);
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 2, useLineColor ? 0 : 1);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupDiamond()
+{
+ initialSetup(11, 11, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ Point aPoint1, aPoint2, aPoint3, aPoint4;
+ OutputDeviceTestCommon::createDiamondPoints(maVDRectangle, 4, aPoint1, aPoint2, aPoint3,
+ aPoint4);
+
+ tools::Polygon aPolygon(4);
+
+ aPolygon.SetPoint(aPoint1, 0);
+ aPolygon.SetPoint(aPoint2, 1);
+ aPolygon.SetPoint(aPoint3, 2);
+ aPolygon.SetPoint(aPoint4, 3);
+ aPolygon.Optimize(PolyOptimizeFlags::CLOSE);
+
+ mpVirtualDevice->DrawPolygon(aPolygon);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupLines()
+{
+ initialSetup(13, 13, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ Point aHorizontalLinePoint1, aHorizontalLinePoint2;
+ Point aVerticalLinePoint1, aVerticalLinePoint2;
+ Point aDiagonalLinePoint1, aDiagonalLinePoint2;
+
+ OutputDeviceTestCommon::createHorizontalVerticalDiagonalLinePoints(
+ maVDRectangle, aHorizontalLinePoint1, aHorizontalLinePoint2, aVerticalLinePoint1,
+ aVerticalLinePoint2, aDiagonalLinePoint1, aDiagonalLinePoint2);
+
+ tools::Polygon aHorizontalPolygon(2);
+ aHorizontalPolygon.SetPoint(aHorizontalLinePoint1, 0);
+ aHorizontalPolygon.SetPoint(aHorizontalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aHorizontalPolygon);
+
+ tools::Polygon aVerticalPolygon(2);
+ aVerticalPolygon.SetPoint(aVerticalLinePoint1, 0);
+ aVerticalPolygon.SetPoint(aVerticalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aVerticalPolygon);
+
+ tools::Polygon aDiagonalPolygon(2);
+ aDiagonalPolygon.SetPoint(aDiagonalLinePoint1, 0);
+ aDiagonalPolygon.SetPoint(aDiagonalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aDiagonalPolygon);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupAALines()
+{
+ initialSetup(13, 13, constBackgroundColor);
+
+ mpVirtualDevice->SetAntialiasing(AntialiasingFlags::Enable);
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ Point aHorizontalLinePoint1, aHorizontalLinePoint2;
+ Point aVerticalLinePoint1, aVerticalLinePoint2;
+ Point aDiagonalLinePoint1, aDiagonalLinePoint2;
+
+ OutputDeviceTestCommon::createHorizontalVerticalDiagonalLinePoints(
+ maVDRectangle, aHorizontalLinePoint1, aHorizontalLinePoint2, aVerticalLinePoint1,
+ aVerticalLinePoint2, aDiagonalLinePoint1, aDiagonalLinePoint2);
+
+ tools::Polygon aHorizontalPolygon(2);
+ aHorizontalPolygon.SetPoint(aHorizontalLinePoint1, 0);
+ aHorizontalPolygon.SetPoint(aHorizontalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aHorizontalPolygon);
+
+ tools::Polygon aVerticalPolygon(2);
+ aVerticalPolygon.SetPoint(aVerticalLinePoint1, 0);
+ aVerticalPolygon.SetPoint(aVerticalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aVerticalPolygon);
+
+ tools::Polygon aDiagonalPolygon(2);
+ aDiagonalPolygon.SetPoint(aDiagonalLinePoint1, 0);
+ aDiagonalPolygon.SetPoint(aDiagonalLinePoint2, 1);
+ mpVirtualDevice->DrawPolygon(aDiagonalPolygon);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupDropShape()
+{
+ initialSetup(21, 21, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ mpVirtualDevice->DrawPolygon(OutputDeviceTestCommon::createDropShapePolygon());
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupAADropShape()
+{
+ initialSetup(21, 21, constBackgroundColor, true);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ mpVirtualDevice->DrawPolygon(OutputDeviceTestCommon::createDropShapePolygon());
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupHalfEllipse(bool aEnableAA)
+{
+ initialSetup(19, 21, constBackgroundColor, aEnableAA);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ mpVirtualDevice->DrawPolyLine(
+ tools::Polygon(OutputDeviceTestCommon::createHalfEllipsePolygon()));
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupClosedBezier()
+{
+ initialSetup(21, 16, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ mpVirtualDevice->DrawPolyLine(OutputDeviceTestCommon::createClosedBezierLoop(maVDRectangle));
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupFilledAsymmetricalDropShape()
+{
+ initialSetup(21, 21, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor();
+ mpVirtualDevice->SetFillColor(constFillColor);
+
+ mpVirtualDevice->DrawPolygon(OutputDeviceTestCommon::createDropShapePolygon());
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupRectangleOnSize1028()
+{
+ initialSetup(1028, 1028, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 2);
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 5);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupRectangleOnSize4096()
+{
+ initialSetup(4096, 4096, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 2);
+ drawPolygonOffset(*mpVirtualDevice, maVDRectangle, 5);
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+Bitmap OutputDeviceTestPolygon::setupOpenPolygon()
+{
+ initialSetup(21, 21, constBackgroundColor);
+
+ mpVirtualDevice->SetLineColor(constLineColor);
+ mpVirtualDevice->SetFillColor();
+
+ mpVirtualDevice->DrawPolygon(tools::Polygon(OutputDeviceTestCommon::createOpenPolygon(maVDRectangle)));
+ mpVirtualDevice->DrawPolygon(tools::Polygon(OutputDeviceTestCommon::createOpenPolygon(maVDRectangle, 7)));
+
+ return mpVirtualDevice->GetBitmap(maVDRectangle.TopLeft(), maVDRectangle.GetSize());
+}
+
+} // end namespace vcl::test
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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