Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

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

1 files changed, 730 insertions, 0 deletions

diff --git a/vcl/qt5/QtGraphics_GDI.cxx b/vcl/qt5/QtGraphics_GDI.cxx
new file mode 100644
index 000000000..6849a3bc7
--- /dev/null
+++ b/vcl/qt5/QtGraphics_GDI.cxx
@@ -0,0 +1,730 @@
+/* -*- 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 .
+ */
+
+#include <QtGraphics.hxx>
+
+#include <QtBitmap.hxx>
+#include <QtPainter.hxx>
+
+#include <sal/log.hxx>
+
+#include <QtGui/QPainter>
+#include <QtGui/QScreen>
+#include <QtGui/QWindow>
+#include <QtWidgets/QWidget>
+
+#include <numeric>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+#include <basegfx/polygon/b2dpolypolygontools.hxx>
+
+QtGraphicsBackend::QtGraphicsBackend(QtFrame* pFrame, QImage* pQImage)
+    : m_pFrame(pFrame)
+    , m_pQImage(pQImage)
+    , m_aLineColor(0x00, 0x00, 0x00)
+    , m_aFillColor(0xFF, 0xFF, 0XFF)
+    , m_eCompositionMode(QPainter::CompositionMode_SourceOver)
+{
+    ResetClipRegion();
+}
+
+QtGraphicsBackend::~QtGraphicsBackend() {}
+
+const basegfx::B2DPoint aHalfPointOfs(0.5, 0.5);
+
+static void AddPolygonToPath(QPainterPath& rPath, const basegfx::B2DPolygon& rPolygon,
+                             bool bClosePath, bool bPixelSnap, bool bLineDraw)
+{
+    const int nPointCount = rPolygon.count();
+    // short circuit if there is nothing to do
+    if (nPointCount == 0)
+        return;
+
+    const bool bHasCurves = rPolygon.areControlPointsUsed();
+    for (int nPointIdx = 0, nPrevIdx = 0;; nPrevIdx = nPointIdx++)
+    {
+        int nClosedIdx = nPointIdx;
+        if (nPointIdx >= nPointCount)
+        {
+            // prepare to close last curve segment if needed
+            if (bClosePath && (nPointIdx == nPointCount))
+                nClosedIdx = 0;
+            else
+                break;
+        }
+
+        basegfx::B2DPoint aPoint = rPolygon.getB2DPoint(nClosedIdx);
+
+        if (bPixelSnap)
+        {
+            // snap device coordinates to full pixels
+            aPoint.setX(basegfx::fround(aPoint.getX()));
+            aPoint.setY(basegfx::fround(aPoint.getY()));
+        }
+
+        if (bLineDraw)
+            aPoint += aHalfPointOfs;
+        if (!nPointIdx)
+        {
+            // first point => just move there
+            rPath.moveTo(aPoint.getX(), aPoint.getY());
+            continue;
+        }
+
+        bool bPendingCurve = false;
+        if (bHasCurves)
+        {
+            bPendingCurve = rPolygon.isNextControlPointUsed(nPrevIdx);
+            bPendingCurve |= rPolygon.isPrevControlPointUsed(nClosedIdx);
+        }
+
+        if (!bPendingCurve) // line segment
+            rPath.lineTo(aPoint.getX(), aPoint.getY());
+        else // cubic bezier segment
+        {
+            basegfx::B2DPoint aCP1 = rPolygon.getNextControlPoint(nPrevIdx);
+            basegfx::B2DPoint aCP2 = rPolygon.getPrevControlPoint(nClosedIdx);
+            if (bLineDraw)
+            {
+                aCP1 += aHalfPointOfs;
+                aCP2 += aHalfPointOfs;
+            }
+            rPath.cubicTo(aCP1.getX(), aCP1.getY(), aCP2.getX(), aCP2.getY(), aPoint.getX(),
+                          aPoint.getY());
+        }
+    }
+
+    if (bClosePath)
+        rPath.closeSubpath();
+}
+
+static bool AddPolyPolygonToPath(QPainterPath& rPath, const basegfx::B2DPolyPolygon& rPolyPoly,
+                                 bool bPixelSnap, bool bLineDraw)
+{
+    if (rPolyPoly.count() == 0)
+        return false;
+    for (auto const& rPolygon : rPolyPoly)
+    {
+        AddPolygonToPath(rPath, rPolygon, true, bPixelSnap, bLineDraw);
+    }
+    return true;
+}
+
+bool QtGraphicsBackend::setClipRegion(const vcl::Region& rRegion)
+{
+    if (rRegion.IsRectangle())
+    {
+        m_aClipRegion = toQRect(rRegion.GetBoundRect());
+        if (!m_aClipPath.isEmpty())
+        {
+            QPainterPath aPath;
+            m_aClipPath.swap(aPath);
+        }
+    }
+    else if (!rRegion.HasPolyPolygonOrB2DPolyPolygon())
+    {
+        QRegion aQRegion;
+        RectangleVector aRectangles;
+        rRegion.GetRegionRectangles(aRectangles);
+        for (const auto& rRect : aRectangles)
+            aQRegion += toQRect(rRect);
+        m_aClipRegion = aQRegion;
+        if (!m_aClipPath.isEmpty())
+        {
+            QPainterPath aPath;
+            m_aClipPath.swap(aPath);
+        }
+    }
+    else
+    {
+        QPainterPath aPath;
+        const basegfx::B2DPolyPolygon aPolyClip(rRegion.GetAsB2DPolyPolygon());
+        AddPolyPolygonToPath(aPath, aPolyClip, !getAntiAlias(), false);
+        m_aClipPath.swap(aPath);
+        if (!m_aClipRegion.isEmpty())
+        {
+            QRegion aRegion;
+            m_aClipRegion.swap(aRegion);
+        }
+    }
+    return true;
+}
+
+void QtGraphicsBackend::ResetClipRegion()
+{
+    if (m_pQImage)
+        m_aClipRegion = QRegion(m_pQImage->rect());
+    else
+        m_aClipRegion = QRegion();
+    if (!m_aClipPath.isEmpty())
+    {
+        QPainterPath aPath;
+        m_aClipPath.swap(aPath);
+    }
+}
+
+void QtGraphicsBackend::drawPixel(tools::Long nX, tools::Long nY)
+{
+    QtPainter aPainter(*this);
+    aPainter.drawPoint(nX, nY);
+    aPainter.update(nX, nY, 1, 1);
+}
+
+void QtGraphicsBackend::drawPixel(tools::Long nX, tools::Long nY, Color nColor)
+{
+    QtPainter aPainter(*this);
+    aPainter.setPen(toQColor(nColor));
+    aPainter.setPen(Qt::SolidLine);
+    aPainter.drawPoint(nX, nY);
+    aPainter.update(nX, nY, 1, 1);
+}
+
+void QtGraphicsBackend::drawLine(tools::Long nX1, tools::Long nY1, tools::Long nX2, tools::Long nY2)
+{
+    QtPainter aPainter(*this);
+    aPainter.drawLine(nX1, nY1, nX2, nY2);
+
+    tools::Long tmp;
+    if (nX1 > nX2)
+    {
+        tmp = nX1;
+        nX1 = nX2;
+        nX2 = tmp;
+    }
+    if (nY1 > nY2)
+    {
+        tmp = nY1;
+        nY1 = nY2;
+        nY2 = tmp;
+    }
+    aPainter.update(nX1, nY1, nX2 - nX1 + 1, nY2 - nY1 + 1);
+}
+
+void QtGraphicsBackend::drawRect(tools::Long nX, tools::Long nY, tools::Long nWidth,
+                                 tools::Long nHeight)
+{
+    if (SALCOLOR_NONE == m_aFillColor && SALCOLOR_NONE == m_aLineColor)
+        return;
+
+    QtPainter aPainter(*this, true);
+    if (SALCOLOR_NONE != m_aFillColor)
+        aPainter.fillRect(nX, nY, nWidth, nHeight, aPainter.brush());
+    if (SALCOLOR_NONE != m_aLineColor)
+        aPainter.drawRect(nX, nY, nWidth - 1, nHeight - 1);
+    aPainter.update(nX, nY, nWidth, nHeight);
+}
+
+void QtGraphicsBackend::drawPolyLine(sal_uInt32 nPoints, const Point* pPtAry)
+{
+    if (0 == nPoints)
+        return;
+
+    QtPainter aPainter(*this);
+    QPoint* pPoints = new QPoint[nPoints];
+    QPoint aTopLeft(pPtAry->getX(), pPtAry->getY());
+    QPoint aBottomRight = aTopLeft;
+    for (sal_uInt32 i = 0; i < nPoints; ++i, ++pPtAry)
+    {
+        pPoints[i] = QPoint(pPtAry->getX(), pPtAry->getY());
+        if (pPtAry->getX() < aTopLeft.x())
+            aTopLeft.setX(pPtAry->getX());
+        if (pPtAry->getY() < aTopLeft.y())
+            aTopLeft.setY(pPtAry->getY());
+        if (pPtAry->getX() > aBottomRight.x())
+            aBottomRight.setX(pPtAry->getX());
+        if (pPtAry->getY() > aBottomRight.y())
+            aBottomRight.setY(pPtAry->getY());
+    }
+    aPainter.drawPolyline(pPoints, nPoints);
+    delete[] pPoints;
+    aPainter.update(QRect(aTopLeft, aBottomRight));
+}
+
+void QtGraphicsBackend::drawPolygon(sal_uInt32 nPoints, const Point* pPtAry)
+{
+    QtPainter aPainter(*this, true);
+    QPolygon aPolygon(nPoints);
+    for (sal_uInt32 i = 0; i < nPoints; ++i, ++pPtAry)
+        aPolygon.setPoint(i, pPtAry->getX(), pPtAry->getY());
+    aPainter.drawPolygon(aPolygon);
+    aPainter.update(aPolygon.boundingRect());
+}
+
+void QtGraphicsBackend::drawPolyPolygon(sal_uInt32 nPolyCount, const sal_uInt32* pPoints,
+                                        const Point** ppPtAry)
+{
+    // ignore invisible polygons
+    if (SALCOLOR_NONE == m_aFillColor && SALCOLOR_NONE == m_aLineColor)
+        return;
+
+    QPainterPath aPath;
+    for (sal_uInt32 nPoly = 0; nPoly < nPolyCount; nPoly++)
+    {
+        const sal_uInt32 nPoints = pPoints[nPoly];
+        if (nPoints > 1)
+        {
+            const Point* pPtAry = ppPtAry[nPoly];
+            aPath.moveTo(pPtAry->getX(), pPtAry->getY());
+            pPtAry++;
+            for (sal_uInt32 nPoint = 1; nPoint < nPoints; nPoint++, pPtAry++)
+                aPath.lineTo(pPtAry->getX(), pPtAry->getY());
+            aPath.closeSubpath();
+        }
+    }
+
+    QtPainter aPainter(*this, true);
+    aPainter.drawPath(aPath);
+    aPainter.update(aPath.boundingRect());
+}
+
+bool QtGraphicsBackend::drawPolyPolygon(const basegfx::B2DHomMatrix& rObjectToDevice,
+                                        const basegfx::B2DPolyPolygon& rPolyPolygon,
+                                        double fTransparency)
+{
+    // ignore invisible polygons
+    if (SALCOLOR_NONE == m_aFillColor && SALCOLOR_NONE == m_aLineColor)
+        return true;
+    if ((fTransparency >= 1.0) || (fTransparency < 0))
+        return true;
+
+    // Fallback: Transform to DeviceCoordinates
+    basegfx::B2DPolyPolygon aPolyPolygon(rPolyPolygon);
+    aPolyPolygon.transform(rObjectToDevice);
+
+    QPainterPath aPath;
+    // ignore empty polygons
+    if (!AddPolyPolygonToPath(aPath, aPolyPolygon, !getAntiAlias(), m_aLineColor != SALCOLOR_NONE))
+        return true;
+
+    QtPainter aPainter(*this, true, 255 * (1.0 - fTransparency));
+    aPainter.drawPath(aPath);
+    aPainter.update(aPath.boundingRect());
+    return true;
+}
+
+bool QtGraphicsBackend::drawPolyLineBezier(sal_uInt32 /*nPoints*/, const Point* /*pPtAry*/,
+                                           const PolyFlags* /*pFlgAry*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::drawPolygonBezier(sal_uInt32 /*nPoints*/, const Point* /*pPtAry*/,
+                                          const PolyFlags* /*pFlgAry*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::drawPolyPolygonBezier(sal_uInt32 /*nPoly*/, const sal_uInt32* /*pPoints*/,
+                                              const Point* const* /*pPtAry*/,
+                                              const PolyFlags* const* /*pFlgAry*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::drawPolyLine(const basegfx::B2DHomMatrix& rObjectToDevice,
+                                     const basegfx::B2DPolygon& rPolyLine, double fTransparency,
+                                     double fLineWidth,
+                                     const std::vector<double>* pStroke, // MM01
+                                     basegfx::B2DLineJoin eLineJoin, css::drawing::LineCap eLineCap,
+                                     double fMiterMinimumAngle, bool bPixelSnapHairline)
+{
+    if (SALCOLOR_NONE == m_aFillColor && SALCOLOR_NONE == m_aLineColor)
+    {
+        return true;
+    }
+
+    // MM01 check done for simple reasons
+    if (!rPolyLine.count() || fTransparency < 0.0 || fTransparency > 1.0)
+    {
+        return true;
+    }
+
+    // MM01 need to do line dashing as fallback stuff here now
+    const double fDotDashLength(
+        nullptr != pStroke ? std::accumulate(pStroke->begin(), pStroke->end(), 0.0) : 0.0);
+    const bool bStrokeUsed(0.0 != fDotDashLength);
+    assert(!bStrokeUsed || (bStrokeUsed && pStroke));
+    basegfx::B2DPolyPolygon aPolyPolygonLine;
+
+    if (bStrokeUsed)
+    {
+        // apply LineStyle
+        basegfx::utils::applyLineDashing(rPolyLine, // source
+                                         *pStroke, // pattern
+                                         &aPolyPolygonLine, // target for lines
+                                         nullptr, // target for gaps
+                                         fDotDashLength); // full length if available
+    }
+    else
+    {
+        // no line dashing, just copy
+        aPolyPolygonLine.append(rPolyLine);
+    }
+
+    // Transform to DeviceCoordinates, get DeviceLineWidth, execute PixelSnapHairline
+    aPolyPolygonLine.transform(rObjectToDevice);
+    if (bPixelSnapHairline)
+    {
+        aPolyPolygonLine = basegfx::utils::snapPointsOfHorizontalOrVerticalEdges(aPolyPolygonLine);
+    }
+
+    // tdf#124848 get correct LineWidth in discrete coordinates,
+    if (fLineWidth == 0) // hairline
+        fLineWidth = 1.0;
+    else // Adjust line width for object-to-device scale.
+        fLineWidth = (rObjectToDevice * basegfx::B2DVector(fLineWidth, 0)).getLength();
+
+    // setup poly-polygon path
+    QPainterPath aPath;
+
+    // MM01 todo - I assume that this is OKAY to be done in one run for Qt,
+    // but this NEEDS to be checked/verified
+    for (sal_uInt32 a(0); a < aPolyPolygonLine.count(); a++)
+    {
+        const basegfx::B2DPolygon aPolyLine(aPolyPolygonLine.getB2DPolygon(a));
+        AddPolygonToPath(aPath, aPolyLine, aPolyLine.isClosed(), !getAntiAlias(), true);
+    }
+
+    QtPainter aPainter(*this, false, 255 * (1.0 - fTransparency));
+
+    // setup line attributes
+    QPen aPen = aPainter.pen();
+    aPen.setWidth(fLineWidth);
+
+    switch (eLineJoin)
+    {
+        case basegfx::B2DLineJoin::Bevel:
+            aPen.setJoinStyle(Qt::BevelJoin);
+            break;
+        case basegfx::B2DLineJoin::Round:
+            aPen.setJoinStyle(Qt::RoundJoin);
+            break;
+        case basegfx::B2DLineJoin::NONE:
+        case basegfx::B2DLineJoin::Miter:
+            aPen.setMiterLimit(1.0 / sin(fMiterMinimumAngle / 2.0));
+            aPen.setJoinStyle(Qt::MiterJoin);
+            break;
+    }
+
+    switch (eLineCap)
+    {
+        default: // css::drawing::LineCap_BUTT:
+            aPen.setCapStyle(Qt::FlatCap);
+            break;
+        case css::drawing::LineCap_ROUND:
+            aPen.setCapStyle(Qt::RoundCap);
+            break;
+        case css::drawing::LineCap_SQUARE:
+            aPen.setCapStyle(Qt::SquareCap);
+            break;
+    }
+
+    aPainter.setPen(aPen);
+    aPainter.drawPath(aPath);
+    aPainter.update(aPath.boundingRect());
+    return true;
+}
+
+bool QtGraphicsBackend::drawGradient(const tools::PolyPolygon& /*rPolyPolygon*/,
+                                     const Gradient& /*rGradient*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::implDrawGradient(basegfx::B2DPolyPolygon const& /*rPolyPolygon*/,
+                                         SalGradient const& /*rGradient*/)
+{
+    return false;
+}
+
+void QtGraphicsBackend::drawScaledImage(const SalTwoRect& rPosAry, const QImage& rImage)
+{
+    QtPainter aPainter(*this);
+    QRect aSrcRect(rPosAry.mnSrcX, rPosAry.mnSrcY, rPosAry.mnSrcWidth, rPosAry.mnSrcHeight);
+    QRect aDestRect(rPosAry.mnDestX, rPosAry.mnDestY, rPosAry.mnDestWidth, rPosAry.mnDestHeight);
+    aPainter.drawImage(aDestRect, rImage, aSrcRect);
+    aPainter.update(aDestRect);
+}
+
+void QtGraphicsBackend::copyArea(tools::Long nDestX, tools::Long nDestY, tools::Long nSrcX,
+                                 tools::Long nSrcY, tools::Long nSrcWidth, tools::Long nSrcHeight,
+                                 bool /*bWindowInvalidate*/)
+{
+    if (nDestX == nSrcX && nDestY == nSrcY)
+        return;
+
+    SalTwoRect aTR(nSrcX, nSrcY, nSrcWidth, nSrcHeight, nDestX, nDestY, nSrcWidth, nSrcHeight);
+
+    QImage* pImage = m_pQImage;
+    QImage aImage = pImage->copy(aTR.mnSrcX, aTR.mnSrcY, aTR.mnSrcWidth, aTR.mnSrcHeight);
+    pImage = &aImage;
+    aTR.mnSrcX = 0;
+    aTR.mnSrcY = 0;
+
+    drawScaledImage(aTR, *pImage);
+}
+
+void QtGraphicsBackend::copyBits(const SalTwoRect& rPosAry, SalGraphics* pSrcGraphics)
+{
+    if (rPosAry.mnSrcWidth <= 0 || rPosAry.mnSrcHeight <= 0 || rPosAry.mnDestWidth <= 0
+        || rPosAry.mnDestHeight <= 0)
+        return;
+
+    QImage aImage, *pImage;
+    SalTwoRect aPosAry = rPosAry;
+
+    if (!pSrcGraphics)
+    {
+        pImage = m_pQImage;
+        aImage
+            = pImage->copy(rPosAry.mnSrcX, rPosAry.mnSrcY, rPosAry.mnSrcWidth, rPosAry.mnSrcHeight);
+        pImage = &aImage;
+        aPosAry.mnSrcX = 0;
+        aPosAry.mnSrcY = 0;
+    }
+    else
+        pImage = static_cast<QtGraphics*>(pSrcGraphics)->getQImage();
+
+    drawScaledImage(aPosAry, *pImage);
+}
+
+void QtGraphicsBackend::drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSalBitmap)
+{
+    if (rPosAry.mnSrcWidth <= 0 || rPosAry.mnSrcHeight <= 0 || rPosAry.mnDestWidth <= 0
+        || rPosAry.mnDestHeight <= 0)
+        return;
+
+    const QImage* pImage = static_cast<const QtBitmap*>(&rSalBitmap)->GetQImage();
+
+    assert(pImage);
+
+    drawScaledImage(rPosAry, *pImage);
+}
+
+void QtGraphicsBackend::drawBitmap(const SalTwoRect& rPosAry, const SalBitmap& /*rSalBitmap*/,
+                                   const SalBitmap& /*rTransparentBitmap*/)
+{
+    if (rPosAry.mnSrcWidth <= 0 || rPosAry.mnSrcHeight <= 0 || rPosAry.mnDestWidth <= 0
+        || rPosAry.mnDestHeight <= 0)
+        return;
+
+    assert(rPosAry.mnSrcWidth == rPosAry.mnDestWidth);
+    assert(rPosAry.mnSrcHeight == rPosAry.mnDestHeight);
+}
+
+void QtGraphicsBackend::drawMask(const SalTwoRect& rPosAry, const SalBitmap& /*rSalBitmap*/,
+                                 Color /*nMaskColor*/)
+{
+    if (rPosAry.mnSrcWidth <= 0 || rPosAry.mnSrcHeight <= 0 || rPosAry.mnDestWidth <= 0
+        || rPosAry.mnDestHeight <= 0)
+        return;
+
+    assert(rPosAry.mnSrcWidth == rPosAry.mnDestWidth);
+    assert(rPosAry.mnSrcHeight == rPosAry.mnDestHeight);
+}
+
+std::shared_ptr<SalBitmap> QtGraphicsBackend::getBitmap(tools::Long nX, tools::Long nY,
+                                                        tools::Long nWidth, tools::Long nHeight)
+{
+    return std::make_shared<QtBitmap>(m_pQImage->copy(nX, nY, nWidth, nHeight));
+}
+
+Color QtGraphicsBackend::getPixel(tools::Long nX, tools::Long nY)
+{
+    return Color(ColorTransparency, m_pQImage->pixel(nX, nY));
+}
+
+void QtGraphicsBackend::invert(tools::Long nX, tools::Long nY, tools::Long nWidth,
+                               tools::Long nHeight, SalInvert nFlags)
+{
+    QtPainter aPainter(*this);
+    if (SalInvert::N50 & nFlags)
+    {
+        aPainter.setCompositionMode(QPainter::RasterOp_SourceXorDestination);
+        QBrush aBrush(Qt::white, Qt::Dense4Pattern);
+        aPainter.fillRect(nX, nY, nWidth, nHeight, aBrush);
+    }
+    else
+    {
+        if (SalInvert::TrackFrame & nFlags)
+        {
+            aPainter.setCompositionMode(QPainter::RasterOp_SourceXorDestination);
+            QPen aPen(Qt::white);
+            aPen.setStyle(Qt::DotLine);
+            aPainter.setPen(aPen);
+            aPainter.drawRect(nX, nY, nWidth, nHeight);
+        }
+        else
+        {
+            aPainter.setCompositionMode(QPainter::RasterOp_SourceXorDestination);
+            aPainter.fillRect(nX, nY, nWidth, nHeight, Qt::white);
+        }
+    }
+    aPainter.update(nX, nY, nWidth, nHeight);
+}
+
+void QtGraphicsBackend::invert(sal_uInt32 /*nPoints*/, const Point* /*pPtAry*/,
+                               SalInvert /*nFlags*/)
+{
+}
+
+bool QtGraphicsBackend::drawEPS(tools::Long /*nX*/, tools::Long /*nY*/, tools::Long /*nWidth*/,
+                                tools::Long /*nHeight*/, void* /*pPtr*/, sal_uInt32 /*nSize*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::blendBitmap(const SalTwoRect&, const SalBitmap& /*rBitmap*/)
+{
+    return false;
+}
+
+bool QtGraphicsBackend::blendAlphaBitmap(const SalTwoRect&, const SalBitmap& /*rSrcBitmap*/,
+                                         const SalBitmap& /*rMaskBitmap*/,
+                                         const SalBitmap& /*rAlphaBitmap*/)
+{
+    return false;
+}
+
+static QImage getAlphaImage(const SalBitmap& rSourceBitmap, const SalBitmap& rAlphaBitmap)
+{
+    assert(rSourceBitmap.GetSize() == rAlphaBitmap.GetSize());
+    assert(rAlphaBitmap.GetBitCount() == 8 || rAlphaBitmap.GetBitCount() == 1);
+
+    QImage aAlphaMask = *static_cast<const QtBitmap*>(&rAlphaBitmap)->GetQImage();
+    aAlphaMask.invertPixels();
+
+    const QImage* pBitmap = static_cast<const QtBitmap*>(&rSourceBitmap)->GetQImage();
+    QImage aImage = pBitmap->convertToFormat(Qt_DefaultFormat32);
+    aImage.setAlphaChannel(aAlphaMask);
+    return aImage;
+}
+
+bool QtGraphicsBackend::drawAlphaBitmap(const SalTwoRect& rPosAry, const SalBitmap& rSourceBitmap,
+                                        const SalBitmap& rAlphaBitmap)
+{
+    drawScaledImage(rPosAry, getAlphaImage(rSourceBitmap, rAlphaBitmap));
+    return true;
+}
+
+bool QtGraphicsBackend::drawTransformedBitmap(const basegfx::B2DPoint& rNull,
+                                              const basegfx::B2DPoint& rX,
+                                              const basegfx::B2DPoint& rY,
+                                              const SalBitmap& rSourceBitmap,
+                                              const SalBitmap* pAlphaBitmap, double fAlpha)
+{
+    QImage aImage;
+    if (!pAlphaBitmap)
+        aImage = *static_cast<const QtBitmap*>(&rSourceBitmap)->GetQImage();
+    else
+        aImage = getAlphaImage(rSourceBitmap, *pAlphaBitmap);
+
+    const basegfx::B2DVector aXRel = rX - rNull;
+    const basegfx::B2DVector aYRel = rY - rNull;
+
+    QtPainter aPainter(*this);
+    aPainter.setOpacity(fAlpha);
+    aPainter.setTransform(QTransform(aXRel.getX() / aImage.width(), aXRel.getY() / aImage.width(),
+                                     aYRel.getX() / aImage.height(), aYRel.getY() / aImage.height(),
+                                     rNull.getX(), rNull.getY()));
+    aPainter.drawImage(QPoint(0, 0), aImage);
+    aPainter.update(aImage.rect());
+    return true;
+}
+
+bool QtGraphicsBackend::hasFastDrawTransformedBitmap() const { return false; }
+
+bool QtGraphicsBackend::drawAlphaRect(tools::Long nX, tools::Long nY, tools::Long nWidth,
+                                      tools::Long nHeight, sal_uInt8 nTransparency)
+{
+    if (SALCOLOR_NONE == m_aFillColor && SALCOLOR_NONE == m_aLineColor)
+        return true;
+    assert(nTransparency <= 100);
+    if (nTransparency > 100)
+        nTransparency = 100;
+    QtPainter aPainter(*this, true, (100 - nTransparency) * (255.0 / 100));
+    if (SALCOLOR_NONE != m_aFillColor)
+        aPainter.fillRect(nX, nY, nWidth, nHeight, aPainter.brush());
+    if (SALCOLOR_NONE != m_aLineColor)
+        aPainter.drawRect(nX, nY, nWidth - 1, nHeight - 1);
+    aPainter.update(nX, nY, nWidth, nHeight);
+    return true;
+}
+
+sal_uInt16 QtGraphicsBackend::GetBitCount() const { return getFormatBits(m_pQImage->format()); }
+
+tools::Long QtGraphicsBackend::GetGraphicsWidth() const { return m_pQImage->width(); }
+
+void QtGraphicsBackend::SetLineColor() { m_aLineColor = SALCOLOR_NONE; }
+
+void QtGraphicsBackend::SetLineColor(Color nColor) { m_aLineColor = nColor; }
+
+void QtGraphicsBackend::SetFillColor() { m_aFillColor = SALCOLOR_NONE; }
+
+void QtGraphicsBackend::SetFillColor(Color nColor) { m_aFillColor = nColor; }
+
+void QtGraphicsBackend::SetXORMode(bool bSet, bool)
+{
+    if (bSet)
+        m_eCompositionMode = QPainter::CompositionMode_Xor;
+    else
+        m_eCompositionMode = QPainter::CompositionMode_SourceOver;
+}
+
+void QtGraphicsBackend::SetROPLineColor(SalROPColor /*nROPColor*/) {}
+
+void QtGraphicsBackend::SetROPFillColor(SalROPColor /*nROPColor*/) {}
+
+bool QtGraphicsBackend::supportsOperation(OutDevSupportType eType) const
+{
+    switch (eType)
+    {
+        case OutDevSupportType::B2DDraw:
+        case OutDevSupportType::TransparentRect:
+            return true;
+        default:
+            return false;
+    }
+}
+
+void QtGraphics::GetResolution(sal_Int32& rDPIX, sal_Int32& rDPIY)
+{
+    char* pForceDpi;
+    if ((pForceDpi = getenv("SAL_FORCEDPI")))
+    {
+        OString sForceDPI(pForceDpi);
+        rDPIX = rDPIY = sForceDPI.toInt32();
+        return;
+    }
+
+    if (!m_pFrame)
+        return;
+
+#if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
+    QScreen* pScreen = m_pFrame->GetQWidget()->screen();
+#else
+    if (!m_pFrame->GetQWidget()->window()->windowHandle())
+        return;
+
+    QScreen* pScreen = m_pFrame->GetQWidget()->window()->windowHandle()->screen();
+#endif
+    rDPIX = pScreen->logicalDotsPerInchX() * pScreen->devicePixelRatio() + 0.5;
+    rDPIY = pScreen->logicalDotsPerInchY() * pScreen->devicePixelRatio() + 0.5;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */