remove support for BITMASK in vcl backends

Rather use a proper alpha channel if we need transparency.

This is another small step towards merged alpha in our vcl
layer.

I suspect the intent in a lot of this code was to save memory.
Which have been a thing way back then, but these days our
backends mostly end up doing a copy-and-convert to a real
alpha channel anyway, so the existing code is actually
now a pessimisation.

Change-Id: I4a2bcbb2f76b841f05bc00580f364492829c69de
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114808
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

31 files changed, 53 insertions, 123 deletions

diff --git a/canvas/source/vcl/backbuffer.cxx b/canvas/source/vcl/backbuffer.cxx
index c2779cdf0489..684a02c8bd55 100644
--- a/canvas/source/vcl/backbuffer.cxx
+++ b/canvas/source/vcl/backbuffer.cxx
@@ -27,14 +27,9 @@
 
 namespace vclcanvas
 {
-    BackBuffer::BackBuffer( const OutputDevice& rRefDevice,
-                            bool                bMonochromeBuffer ) :
-        maVDev( VclPtr<VirtualDevice>::Create( rRefDevice,
-                                   bMonochromeBuffer ? DeviceFormat::BITMASK : DeviceFormat::DEFAULT ) )
+    BackBuffer::BackBuffer( const OutputDevice& rRefDevice ) :
+        maVDev( VclPtr<VirtualDevice>::Create( rRefDevice, DeviceFormat::DEFAULT ) )
     {
-        if( bMonochromeBuffer )
-            return;
-
         tools::SetDefaultDeviceAntiAliasing( maVDev );
     }
 
diff --git a/canvas/source/vcl/backbuffer.hxx b/canvas/source/vcl/backbuffer.hxx
index 6bbeb85ec54b..0e31111b6fcf 100644
--- a/canvas/source/vcl/backbuffer.hxx
+++ b/canvas/source/vcl/backbuffer.hxx
@@ -31,15 +31,8 @@ namespace vclcanvas
     class BackBuffer : public OutDevProvider
     {
     public:
-        /** Create a backbuffer for given reference device
-
-            @param bMonochromeBuffer
-            When false, default depth of reference device is
-            chosen. When true, the buffer will be monochrome, i.e. one
-            bit deep.
-         */
-        BackBuffer( const OutputDevice& rRefDevice,
-                    bool                bMonochromeBuffer=false );
+        /** Create a backbuffer for given reference device */
+        BackBuffer( const OutputDevice& rRefDevice );
         virtual ~BackBuffer() override;
 
         virtual OutputDevice&       getOutDev() override;
diff --git a/canvas/source/vcl/canvascustomsprite.cxx b/canvas/source/vcl/canvascustomsprite.cxx
index 9d1f83a74ef7..4bdebd448b0c 100644
--- a/canvas/source/vcl/canvascustomsprite.cxx
+++ b/canvas/source/vcl/canvascustomsprite.cxx
@@ -58,9 +58,8 @@ namespace vclcanvas
         BackBufferSharedPtr pBackBuffer = std::make_shared<BackBuffer>( rOutDevProvider->getOutDev() );
         pBackBuffer->setSize( aSize );
 
-        // create mask backbuffer, with one bit color depth
-        BackBufferSharedPtr pBackBufferMask = std::make_shared<BackBuffer>( rOutDevProvider->getOutDev(),
-                                                             true );
+        // create mask backbuffer
+        BackBufferSharedPtr pBackBufferMask = std::make_shared<BackBuffer>( rOutDevProvider->getOutDev() );
         pBackBufferMask->setSize( aSize );
 
         // TODO(F1): Implement alpha vdev (could prolly enable
diff --git a/cui/source/dialogs/screenshotannotationdlg.cxx b/cui/source/dialogs/screenshotannotationdlg.cxx
index f5f214ca4fa9..4f02452a8ad7 100644
--- a/cui/source/dialogs/screenshotannotationdlg.cxx
+++ b/cui/source/dialogs/screenshotannotationdlg.cxx
@@ -234,7 +234,7 @@ ScreenshotAnnotationDlg_Impl::ScreenshotAnnotationDlg_Impl(
         maDimmedDialogBitmap.Adjust(-15, 0, 0, 0, 0);
 
         // init paint buffering VirtualDevice
-        mxVirtualBufferDevice = VclPtr<VirtualDevice>::Create(*Application::GetDefaultDevice(), DeviceFormat::DEFAULT, DeviceFormat::BITMASK);
+        mxVirtualBufferDevice = VclPtr<VirtualDevice>::Create(*Application::GetDefaultDevice(), DeviceFormat::DEFAULT);
         mxVirtualBufferDevice->SetOutputSizePixel(maParentDialogSize);
         mxVirtualBufferDevice->SetFillColor(COL_TRANSPARENT);
 
diff --git a/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx b/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
index ff0b830677a5..e8174733bf34 100644
--- a/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
+++ b/drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx
@@ -367,7 +367,7 @@ namespace drawinglayer::primitive2d
             maGraphic(rGraphic),
             maAnimation(rGraphic.GetAnimation()),
             maVirtualDevice(*Application::GetDefaultDevice()),
-            maVirtualDeviceMask(*Application::GetDefaultDevice(), DeviceFormat::BITMASK),
+            maVirtualDeviceMask(*Application::GetDefaultDevice()),
             mnNextFrameToPrepare(SAL_MAX_UINT32),
             maBufferedFirstFrame(),
             maBufferedPrimitives(),
diff --git a/filter/source/msfilter/msdffimp.cxx b/filter/source/msfilter/msdffimp.cxx
index 9b81426f27db..cdd0365bc508 100644
--- a/filter/source/msfilter/msdffimp.cxx
+++ b/filter/source/msfilter/msdffimp.cxx
@@ -4472,7 +4472,7 @@ SdrObject* SvxMSDffManager::ImportShape( const DffRecordHeader& rHd, SvStream& r
                             rOutliner.SetStyleSheetPool(static_cast< SfxStyleSheetPool* >(pRet->getSdrModelFromSdrObject().GetStyleSheetPool()));
                             rOutliner.SetUpdateMode( false );
                             rOutliner.SetText( *pParaObj );
-                            ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::BITMASK);
+                            ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::DEFAULT);
                             pVirDev->SetMapMode(MapMode(MapUnit::Map100thMM));
                             sal_Int32 i, nParagraphs = rOutliner.GetParagraphCount();
                             if ( nParagraphs )
diff --git a/include/vcl/salgtype.hxx b/include/vcl/salgtype.hxx
index 1ab62fbdb6c7..a6559d68da23 100644
--- a/include/vcl/salgtype.hxx
+++ b/include/vcl/salgtype.hxx
@@ -28,7 +28,6 @@
 enum class DeviceFormat {
                             NONE = -1,
                             DEFAULT = 0,
-                            BITMASK = 1,
 #ifdef IOS
                             GRAYSCALE = 8
 #endif
diff --git a/include/vcl/virdev.hxx b/include/vcl/virdev.hxx
index 55a4a7f5ddcb..459660eb71cd 100644
--- a/include/vcl/virdev.hxx
+++ b/include/vcl/virdev.hxx
@@ -82,13 +82,11 @@ protected:
 
         @param eFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
 
         @param eAlphaFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
 
         @param eOutDevType
         This real virtual output device type.
@@ -102,13 +100,11 @@ public:
 
         @param eFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
 
         @param eAlphaFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
      */
     explicit VirtualDevice(DeviceFormat eFormat = DeviceFormat::DEFAULT, DeviceFormat eAlphaFormat = DeviceFormat::NONE)
         : VirtualDevice(nullptr, eFormat, eAlphaFormat, OUTDEV_VIRDEV) {}
@@ -120,8 +116,7 @@ public:
 
         @param eFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
      */
     explicit VirtualDevice(const OutputDevice& rCompDev,
                            DeviceFormat eFormat = DeviceFormat::DEFAULT)
@@ -134,13 +129,11 @@ public:
 
         @param eFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
 
         @param eAlphaFormat
         Device format of the generated virtual device. Use DeviceFormat::DEFAULT here, to
-        indicate: take default screen depth. Only DeviceFormat::BITMASK
-        is the other possibility to denote a binary mask.
+        indicate: take default screen depth.
      */
     explicit VirtualDevice(const OutputDevice& rCompDev,
                            DeviceFormat eFormat, DeviceFormat eAlphaFormat)
diff --git a/sc/source/core/data/documen8.cxx b/sc/source/core/data/documen8.cxx
index 98ba25af1811..b9ee4c8a0e66 100644
--- a/sc/source/core/data/documen8.cxx
+++ b/sc/source/core/data/documen8.cxx
@@ -185,7 +185,7 @@ VirtualDevice* ScDocument::GetVirtualDevice_100th_mm()
 #ifdef IOS
         mpVirtualDevice_100th_mm = VclPtr<VirtualDevice>::Create(DeviceFormat::GRAYSCALE);
 #else
-        mpVirtualDevice_100th_mm = VclPtr<VirtualDevice>::Create(DeviceFormat::BITMASK);
+        mpVirtualDevice_100th_mm = VclPtr<VirtualDevice>::Create(DeviceFormat::DEFAULT);
 #endif
         mpVirtualDevice_100th_mm->SetReferenceDevice(VirtualDevice::RefDevMode::MSO1);
         MapMode aMapMode( mpVirtualDevice_100th_mm->GetMapMode() );
diff --git a/sc/source/ui/cctrl/tbzoomsliderctrl.cxx b/sc/source/ui/cctrl/tbzoomsliderctrl.cxx
index 9c5bbb107ca7..ed8b05b3a0b4 100644
--- a/sc/source/ui/cctrl/tbzoomsliderctrl.cxx
+++ b/sc/source/ui/cctrl/tbzoomsliderctrl.cxx
@@ -395,7 +395,7 @@ void ScZoomSlider::DoPaint(vcl::RenderContext& rRenderContext)
     Size aSliderWindowSize(GetOutputSizePixel());
     tools::Rectangle aRect(Point(0, 0), aSliderWindowSize);
 
-    ScopedVclPtrInstance< VirtualDevice > pVDev(rRenderContext, DeviceFormat::DEFAULT, DeviceFormat::BITMASK);
+    ScopedVclPtrInstance< VirtualDevice > pVDev(rRenderContext);
     pVDev->SetOutputSizePixel(aSliderWindowSize);
     pVDev->SetFillColor( COL_TRANSPARENT );
     pVDev->SetLineColor( COL_TRANSPARENT );
diff --git a/slideshow/source/engine/shapes/gdimtftools.cxx b/slideshow/source/engine/shapes/gdimtftools.cxx
index dfb33d95f38c..0f8644cd3da8 100644
--- a/slideshow/source/engine/shapes/gdimtftools.cxx
+++ b/slideshow/source/engine/shapes/gdimtftools.cxx
@@ -274,7 +274,7 @@ bool getAnimationFromGraphic( VectorOfMtfAnimationFrames&   o_rFrames,
     pVDev->EnableMapMode( false );
 
     // setup mask VDev (alpha VDev is currently rather slow)
-    ScopedVclPtrInstance<VirtualDevice> pVDevMask(DeviceFormat::BITMASK);
+    ScopedVclPtrInstance<VirtualDevice> pVDevMask(DeviceFormat::DEFAULT);
     pVDevMask->SetOutputSizePixel( aAnimSize );
     pVDevMask->EnableMapMode( false );
 
diff --git a/svx/source/customshapes/EnhancedCustomShapeFontWork.cxx b/svx/source/customshapes/EnhancedCustomShapeFontWork.cxx
index 7ea1dc3f29f1..5863c61aee04 100644
--- a/svx/source/customshapes/EnhancedCustomShapeFontWork.cxx
+++ b/svx/source/customshapes/EnhancedCustomShapeFontWork.cxx
@@ -192,7 +192,7 @@ static void CalculateHorizontalScalingFactor(
     aFont.SetOrientation( 0_deg10 );
     // initializing virtual device
 
-    ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::BITMASK);
+    ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::DEFAULT);
     pVirDev->SetMapMode(MapMode(MapUnit::Map100thMM));
     pVirDev->SetFont( aFont );
 
@@ -303,7 +303,7 @@ static void GetTextAreaOutline(
             aFont.SetWeight( rWeightItem.GetWeight() );
 
             // initializing virtual device
-            ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::BITMASK);
+            ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::DEFAULT);
             pVirDev->SetMapMode(MapMode(MapUnit::Map100thMM));
             pVirDev->SetFont( aFont );
             pVirDev->EnableRTL();
diff --git a/sw/source/core/doc/DocumentDeviceManager.cxx b/sw/source/core/doc/DocumentDeviceManager.cxx
index 5083838684aa..5d80bb991b89 100644
--- a/sw/source/core/doc/DocumentDeviceManager.cxx
+++ b/sw/source/core/doc/DocumentDeviceManager.cxx
@@ -263,7 +263,7 @@ VirtualDevice& DocumentDeviceManager::CreateVirtualDevice_() const
 #ifdef IOS
     VclPtr<VirtualDevice> pNewVir = VclPtr<VirtualDevice>::Create(DeviceFormat::GRAYSCALE);
 #else
-    VclPtr<VirtualDevice> pNewVir = VclPtr<VirtualDevice>::Create(DeviceFormat::BITMASK);
+    VclPtr<VirtualDevice> pNewVir = VclPtr<VirtualDevice>::Create(DeviceFormat::DEFAULT);
 #endif
 
     pNewVir->SetReferenceDevice( VirtualDevice::RefDevMode::MSO1 );
diff --git a/vcl/headless/svpinst.cxx b/vcl/headless/svpinst.cxx
index 954f6539d2e6..422928f98d38 100644
--- a/vcl/headless/svpinst.cxx
+++ b/vcl/headless/svpinst.cxx
@@ -243,7 +243,7 @@ void SvpSalInstance::DestroyObject( SalObject* pObject )
 
 std::unique_ptr<SalVirtualDevice> SvpSalInstance::CreateVirtualDevice(SalGraphics* pGraphics,
                                                        tools::Long &nDX, tools::Long &nDY,
-                                                       DeviceFormat eFormat,
+                                                       DeviceFormat /*eFormat*/,
                                                        const SystemGraphicsData* pGd)
 {
     SvpSalGraphics *pSvpSalGraphics = dynamic_cast<SvpSalGraphics*>(pGraphics);
@@ -258,7 +258,7 @@ std::unique_ptr<SalVirtualDevice> SvpSalInstance::CreateVirtualDevice(SalGraphic
     (void)pGd;
     cairo_surface_t* pPreExistingTarget = nullptr;
 #endif
-    std::unique_ptr<SalVirtualDevice> pNew(new SvpSalVirtualDevice(eFormat, pSvpSalGraphics->getSurface(), pPreExistingTarget));
+    std::unique_ptr<SalVirtualDevice> pNew(new SvpSalVirtualDevice(pSvpSalGraphics->getSurface(), pPreExistingTarget));
     pNew->SetSize( nDX, nDY );
     return pNew;
 }
diff --git a/vcl/headless/svpvd.cxx b/vcl/headless/svpvd.cxx
index 9025326827a6..f8e9cb5e6874 100644
--- a/vcl/headless/svpvd.cxx
+++ b/vcl/headless/svpvd.cxx
@@ -31,9 +31,8 @@
 
 using namespace basegfx;
 
-SvpSalVirtualDevice::SvpSalVirtualDevice(DeviceFormat eFormat, cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget)
-    : m_eFormat(eFormat)
-    , m_pRefSurface(pRefSurface)
+SvpSalVirtualDevice::SvpSalVirtualDevice(cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget)
+    : m_pRefSurface(pRefSurface)
     , m_pSurface(pPreExistingTarget)
     , m_bOwnsSurface(!pPreExistingTarget)
 {
@@ -77,12 +76,7 @@ void SvpSalVirtualDevice::CreateSurface(tools::Long nNewDX, tools::Long nNewDY,
         cairo_surface_destroy(m_pSurface);
     }
 
-    if (m_eFormat == DeviceFormat::BITMASK)
-    {
-        m_pSurface = cairo_surface_create_similar(m_pRefSurface, CAIRO_CONTENT_ALPHA,
-                            nNewDX, nNewDY);
-    }
-    else if (pBuffer)
+    if (pBuffer)
     {
         double fXScale, fYScale;
         if (comphelper::LibreOfficeKit::isActive())
diff --git a/vcl/inc/headless/svpvd.hxx b/vcl/inc/headless/svpvd.hxx
index f7270a3ee0e6..ca9e38cee31a 100644
--- a/vcl/inc/headless/svpvd.hxx
+++ b/vcl/inc/headless/svpvd.hxx
@@ -31,7 +31,6 @@ typedef struct _cairo_surface cairo_surface_t;
 
 class VCL_DLLPUBLIC SvpSalVirtualDevice : public SalVirtualDevice
 {
-    DeviceFormat                        m_eFormat;
     cairo_surface_t*                    m_pRefSurface;
     cairo_surface_t*                    m_pSurface;
     bool                                m_bOwnsSurface; // nearly always true, except for edge case of tdf#127529
@@ -44,7 +43,7 @@ protected:
     SvpSalGraphics* AddGraphics(SvpSalGraphics* aGraphics);
 
 public:
-    SvpSalVirtualDevice(DeviceFormat eFormat, cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget);
+    SvpSalVirtualDevice(cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget);
     virtual ~SvpSalVirtualDevice() override;
 
     // SalVirtualDevice
diff --git a/vcl/inc/qt5/Qt5VirtualDevice.hxx b/vcl/inc/qt5/Qt5VirtualDevice.hxx
index 0b94928199c8..79e738e8981f 100644
--- a/vcl/inc/qt5/Qt5VirtualDevice.hxx
+++ b/vcl/inc/qt5/Qt5VirtualDevice.hxx
@@ -34,12 +34,11 @@ class Qt5VirtualDevice final : public SalVirtualDevice
 {
     std::vector<Qt5Graphics*> m_aGraphics;
     std::unique_ptr<QImage> m_pImage;
-    DeviceFormat m_eFormat;
     QSize m_aFrameSize;
     double m_fScale;
 
 public:
-    Qt5VirtualDevice(DeviceFormat eFormat, double fScale);
+    Qt5VirtualDevice(double fScale);
 
     // SalVirtualDevice
     virtual SalGraphics* AcquireGraphics() override;
diff --git a/vcl/qa/cppunit/lifecycle.cxx b/vcl/qa/cppunit/lifecycle.cxx
index bf1ee3575e62..ee706178bad2 100644
--- a/vcl/qa/cppunit/lifecycle.cxx
+++ b/vcl/qa/cppunit/lifecycle.cxx
@@ -72,7 +72,7 @@ void LifecycleTest::testVirtualDevice()
     VclPtr<VirtualDevice> pVDev = VclPtr< VirtualDevice >::Create();
     ScopedVclPtrInstance< VirtualDevice > pVDev2;
     VclPtrInstance<VirtualDevice> pVDev3;
-    VclPtrInstance<VirtualDevice> pVDev4(DeviceFormat::BITMASK);
+    VclPtrInstance<VirtualDevice> pVDev4(DeviceFormat::DEFAULT);
     CPPUNIT_ASSERT(!!pVDev);
     CPPUNIT_ASSERT(!!pVDev2);
     CPPUNIT_ASSERT(!!pVDev3);
diff --git a/vcl/qt5/Qt5Instance.cxx b/vcl/qt5/Qt5Instance.cxx
index 765ed602704e..6d6313f76c65 100644
--- a/vcl/qt5/Qt5Instance.cxx
+++ b/vcl/qt5/Qt5Instance.cxx
@@ -311,7 +311,7 @@ void Qt5Instance::DestroyObject(SalObject* pObject)
 
 std::unique_ptr<SalVirtualDevice>
 Qt5Instance::CreateVirtualDevice(SalGraphics* pGraphics, tools::Long& nDX, tools::Long& nDY,
-                                 DeviceFormat eFormat, const SystemGraphicsData* pGd)
+                                 DeviceFormat /*eFormat*/, const SystemGraphicsData* pGd)
 {
     if (m_bUseCairo)
     {
@@ -321,13 +321,13 @@ Qt5Instance::CreateVirtualDevice(SalGraphics* pGraphics, tools::Long& nDX, tools
         cairo_surface_t* pPreExistingTarget
             = pGd ? static_cast<cairo_surface_t*>(pGd->pSurface) : nullptr;
         std::unique_ptr<SalVirtualDevice> pVD(
-            new Qt5SvpVirtualDevice(eFormat, pSvpSalGraphics->getSurface(), pPreExistingTarget));
+            new Qt5SvpVirtualDevice(pSvpSalGraphics->getSurface(), pPreExistingTarget));
         pVD->SetSize(nDX, nDY);
         return pVD;
     }
     else
     {
-        std::unique_ptr<SalVirtualDevice> pVD(new Qt5VirtualDevice(eFormat, 1));
+        std::unique_ptr<SalVirtualDevice> pVD(new Qt5VirtualDevice(/*scale*/ 1));
         pVD->SetSize(nDX, nDY);
         return pVD;
     }
diff --git a/vcl/qt5/Qt5SvpVirtualDevice.hxx b/vcl/qt5/Qt5SvpVirtualDevice.hxx
index 0eb4ed26ed2f..f961d4ccfed2 100644
--- a/vcl/qt5/Qt5SvpVirtualDevice.hxx
+++ b/vcl/qt5/Qt5SvpVirtualDevice.hxx
@@ -25,9 +25,8 @@
 class VCL_DLLPUBLIC Qt5SvpVirtualDevice : public SvpSalVirtualDevice
 {
 public:
-    Qt5SvpVirtualDevice(DeviceFormat eFormat, cairo_surface_t* pRefSurface,
-                        cairo_surface_t* pPreExistingTarget)
-        : SvpSalVirtualDevice(eFormat, pRefSurface, pPreExistingTarget)
+    Qt5SvpVirtualDevice(cairo_surface_t* pRefSurface, cairo_surface_t* pPreExistingTarget)
+        : SvpSalVirtualDevice(pRefSurface, pPreExistingTarget)
     {
     }
 
diff --git a/vcl/qt5/Qt5VirtualDevice.cxx b/vcl/qt5/Qt5VirtualDevice.cxx
index 30b6e37643f8..6b2c31c6b4b7 100644
--- a/vcl/qt5/Qt5VirtualDevice.cxx
+++ b/vcl/qt5/Qt5VirtualDevice.cxx
@@ -24,9 +24,8 @@
 
 #include <QtGui/QImage>
 
-Qt5VirtualDevice::Qt5VirtualDevice(DeviceFormat eFormat, double fScale)
-    : m_eFormat(eFormat)
-    , m_fScale(fScale)
+Qt5VirtualDevice::Qt5VirtualDevice(double fScale)
+    : m_fScale(fScale)
 {
 }
 
@@ -67,17 +66,10 @@ bool Qt5VirtualDevice::SetSizeUsingBuffer(tools::Long nNewDX, tools::Long nNewDY
     nNewDX *= m_fScale;
     nNewDY *= m_fScale;
 
-    if (m_eFormat == DeviceFormat::BITMASK)
-    {
-        m_pImage.reset(new QImage(nNewDX, nNewDY, QImage::Format_Mono));
-    }
+    if (pBuffer)
+        m_pImage.reset(new QImage(pBuffer, nNewDX, nNewDY, Qt5_DefaultFormat32));
     else
-    {
-        if (pBuffer)
-            m_pImage.reset(new QImage(pBuffer, nNewDX, nNewDY, Qt5_DefaultFormat32));
-        else
-            m_pImage.reset(new QImage(nNewDX, nNewDY, Qt5_DefaultFormat32));
-    }
+        m_pImage.reset(new QImage(nNewDX, nNewDY, Qt5_DefaultFormat32));
 
     m_pImage->fill(Qt::transparent);
     m_pImage->setDevicePixelRatio(m_fScale);
diff --git a/vcl/quartz/salvd.cxx b/vcl/quartz/salvd.cxx
index 9f6bfdd930aa..08997a300e57 100644
--- a/vcl/quartz/salvd.cxx
+++ b/vcl/quartz/salvd.cxx
@@ -116,9 +116,6 @@ AquaSalVirtualDevice::AquaSalVirtualDevice(
         mpGraphics = new AquaSalGraphics(); // never fails
         switch (eFormat)
         {
-            case DeviceFormat::BITMASK:
-                mnBitmapDepth = 1;
-                break;
 #ifdef IOS
             case DeviceFormat::GRAYSCALE:
                 mnBitmapDepth = 8;
diff --git a/vcl/source/bitmap/BitmapEx.cxx b/vcl/source/bitmap/BitmapEx.cxx
index 8d931d324b08..90c0ca8a47b5 100644
--- a/vcl/source/bitmap/BitmapEx.cxx
+++ b/vcl/source/bitmap/BitmapEx.cxx
@@ -548,8 +548,7 @@ BitmapEx BitmapEx:: AutoScaleBitmap(BitmapEx const & aBitmap, const tools::Long
     Size aStdSize( aStandardSize, aStandardSize );
     tools::Rectangle aRect(aEmptyPoint, aStdSize );
 
-    ScopedVclPtrInstance< VirtualDevice > aVirDevice(*Application::GetDefaultDevice(),
-                                                     DeviceFormat::DEFAULT, DeviceFormat::BITMASK);
+    ScopedVclPtrInstance< VirtualDevice > aVirDevice(*Application::GetDefaultDevice());
     aVirDevice->SetOutputSizePixel( aStdSize );
     aVirDevice->SetFillColor( COL_TRANSPARENT );
     aVirDevice->SetLineColor( COL_TRANSPARENT );
diff --git a/vcl/source/filter/eps/eps.cxx b/vcl/source/filter/eps/eps.cxx
index fbea39008af9..2da28338c97c 100644
--- a/vcl/source/filter/eps/eps.cxx
+++ b/vcl/source/filter/eps/eps.cxx
@@ -2001,7 +2001,7 @@ void PSWriter::ImplText( const OUString& rUniString, const Point& rPos, const to
         vcl::Font    aNotRotatedFont( maFont );
         aNotRotatedFont.SetOrientation( 0_deg10 );
 
-        ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::BITMASK);
+        ScopedVclPtrInstance< VirtualDevice > pVirDev(DeviceFormat::DEFAULT);
         pVirDev->SetMapMode( rVDev.GetMapMode() );
         pVirDev->SetFont( aNotRotatedFont );
         pVirDev->SetTextAlign( eTextAlign );
diff --git a/vcl/source/gdi/virdev.cxx b/vcl/source/gdi/virdev.cxx
index 7a2102b0ad0c..be0c54bdc71c 100644
--- a/vcl/source/gdi/virdev.cxx
+++ b/vcl/source/gdi/virdev.cxx
@@ -157,21 +157,10 @@ void VirtualDevice::ImplInitVirDev( const OutputDevice* pOutDev,
             css::uno::Reference< css::uno::XInterface >() );
     }
 
-    switch (meFormat)
-    {
-        case DeviceFormat::BITMASK:
-            mnBitCount = 1;
-            break;
-        default:
-            mnBitCount = pOutDev->GetBitCount();
-            break;
-    }
+    mnBitCount = pOutDev->GetBitCount();
     mnOutWidth      = nDX;
     mnOutHeight     = nDY;
 
-    if (meFormat == DeviceFormat::BITMASK)
-        SetAntialiasing( AntialiasingFlags::DisableText );
-
     mbScreenComp    = pOutDev->IsScreenComp();
 
     mbDevOutput     = true;
diff --git a/vcl/source/outdev/text.cxx b/vcl/source/outdev/text.cxx
index 3229949523d0..9a37ab2dced9 100644
--- a/vcl/source/outdev/text.cxx
+++ b/vcl/source/outdev/text.cxx
@@ -215,7 +215,7 @@ bool OutputDevice::ImplDrawRotateText( SalLayout& rSalLayout )
 
     // cache virtual device for rotation
     if (!mpOutDevData->mpRotateDev)
-        mpOutDevData->mpRotateDev = VclPtr<VirtualDevice>::Create(*this, DeviceFormat::BITMASK);
+        mpOutDevData->mpRotateDev = VclPtr<VirtualDevice>::Create(*this);
     VirtualDevice* pVDev = mpOutDevData->mpRotateDev;
 
     // size it accordingly
diff --git a/vcl/source/outdev/transparent.cxx b/vcl/source/outdev/transparent.cxx
index 415e3f1597a9..10bfa5592f51 100644
--- a/vcl/source/outdev/transparent.cxx
+++ b/vcl/source/outdev/transparent.cxx
@@ -380,7 +380,7 @@ void OutputDevice::EmulateDrawTransparent ( const tools::PolyPolygon& rPolyPoly,
 
         if( !bDrawn )
         {
-            ScopedVclPtrInstance< VirtualDevice > aVDev(*this, DeviceFormat::BITMASK);
+            ScopedVclPtrInstance< VirtualDevice > aVDev(*this);
             const Size aDstSz( aDstRect.GetSize() );
             const sal_uInt8 cTrans = static_cast<sal_uInt8>(MinMax( FRound( nTransparencePercent * 2.55 ), 0, 255 ));
 
diff --git a/vcl/unx/generic/gdi/cairo_xlib_cairo.cxx b/vcl/unx/generic/gdi/cairo_xlib_cairo.cxx
index 238224007f22..3f2698b60611 100644
--- a/vcl/unx/generic/gdi/cairo_xlib_cairo.cxx
+++ b/vcl/unx/generic/gdi/cairo_xlib_cairo.cxx
@@ -302,13 +302,8 @@ namespace cairo
     {
         if (!maSysData.pRenderFormat)
             return DeviceFormat::DEFAULT;
-        switch (static_cast<XRenderPictFormat*>(maSysData.pRenderFormat)->depth)
-        {
-            case 1:
-                return DeviceFormat::BITMASK;
-            default:
-                return DeviceFormat::DEFAULT;
-        }
+        assert (static_cast<XRenderPictFormat*>(maSysData.pRenderFormat)->depth != 1 && "unsupported");
+        return DeviceFormat::DEFAULT;
     }
 }
 
diff --git a/vcl/unx/generic/gdi/salvd.cxx b/vcl/unx/generic/gdi/salvd.cxx
index 666be9c67112..0a824a44a889 100644
--- a/vcl/unx/generic/gdi/salvd.cxx
+++ b/vcl/unx/generic/gdi/salvd.cxx
@@ -87,7 +87,7 @@ void X11SalGraphics::Init( X11SalVirtualDevice *pDevice, cairo_surface_t* pPreEx
 }
 
 X11SalVirtualDevice::X11SalVirtualDevice(SalGraphics const * pGraphics, tools::Long &nDX, tools::Long &nDY,
-                                         DeviceFormat eFormat, const SystemGraphicsData *pData,
+                                         DeviceFormat /*eFormat*/, const SystemGraphicsData *pData,
                                          std::unique_ptr<X11SalGraphics> pNewGraphics) :
     pGraphics_(std::move(pNewGraphics)),
     m_nXScreen(0),
@@ -96,18 +96,7 @@ X11SalVirtualDevice::X11SalVirtualDevice(SalGraphics const * pGraphics, tools::L
     SalColormap* pColormap = nullptr;
     bool bDeleteColormap = false;
 
-    sal_uInt16 nBitCount;
-    switch (eFormat)
-    {
-        case DeviceFormat::BITMASK:
-            nBitCount = 1;
-            break;
-        default:
-            nBitCount = pGraphics->GetBitCount();
-            break;
-
-    }
-
+    sal_uInt16 nBitCount = pGraphics->GetBitCount();
     pDisplay_               = vcl_sal::getSalDisplay(GetGenericUnixSalData());
     nDepth_                 = nBitCount;
 
diff --git a/vcl/unx/gtk3/gtk3gtkinst.cxx b/vcl/unx/gtk3/gtk3gtkinst.cxx
index 8f261d1fdb93..43189617bf63 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -335,7 +335,7 @@ void GtkYieldMutex::ThreadsLeave()
 
 std::unique_ptr<SalVirtualDevice> GtkInstance::CreateVirtualDevice( SalGraphics *pG,
                                                     tools::Long &nDX, tools::Long &nDY,
-                                                    DeviceFormat eFormat,
+                                                    DeviceFormat /*eFormat*/,
                                                     const SystemGraphicsData* pGd )
 {
     EnsureInit();
@@ -343,7 +343,7 @@ std::unique_ptr<SalVirtualDevice> GtkInstance::CreateVirtualDevice( SalGraphics
     assert(pSvpSalGraphics);
     // tdf#127529 see SvpSalInstance::CreateVirtualDevice for the rare case of a non-null pPreExistingTarget
     cairo_surface_t* pPreExistingTarget = pGd ? static_cast<cairo_surface_t*>(pGd->pSurface) : nullptr;
-    std::unique_ptr<SalVirtualDevice> pNew(new SvpSalVirtualDevice(eFormat, pSvpSalGraphics->getSurface(), pPreExistingTarget));
+    std::unique_ptr<SalVirtualDevice> pNew(new SvpSalVirtualDevice(pSvpSalGraphics->getSurface(), pPreExistingTarget));
     pNew->SetSize( nDX, nDY );
     return pNew;
 }
diff --git a/vcl/win/gdi/salvd.cxx b/vcl/win/gdi/salvd.cxx
index 0645b061b0b6..158c1e6908a1 100644
--- a/vcl/win/gdi/salvd.cxx
+++ b/vcl/win/gdi/salvd.cxx
@@ -73,7 +73,7 @@ HBITMAP WinSalVirtualDevice::ImplCreateVirDevBitmap(HDC hDC, tools::Long nDX, to
 
 std::unique_ptr<SalVirtualDevice> WinSalInstance::CreateVirtualDevice( SalGraphics* pSGraphics,
                                                        tools::Long &nDX, tools::Long &nDY,
-                                                       DeviceFormat eFormat,
+                                                       DeviceFormat /*eFormat*/,
                                                        const SystemGraphicsData* pData )
 {
     WinSalGraphics* pGraphics = static_cast<WinSalGraphics*>(pSGraphics);
@@ -102,8 +102,7 @@ std::unique_ptr<SalVirtualDevice> WinSalInstance::CreateVirtualDevice( SalGraphi
     if (!hDC)
         return nullptr;
 
-    sal_uInt16 nBitCount = (eFormat == DeviceFormat::BITMASK) ? 1 : 0;
-
+    sal_uInt16 nBitCount = 0;
     HBITMAP hBmp = nullptr;
     if (!pData)
     {