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>

1 files changed, 1 insertions, 12 deletions

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;