tdf#115297: 1bit images displaying fixed (again)

Previous fix 25cd8436 like any
other before it have some regressions, so reverted.

The root of most problems: fix for tdf#104141
d148340b, where mask drawing
was implemented in bitmap drawing code.

So instead of guessing for type of bitmap, mask is drawn with
DrawBitmapEx resolving all known problems (tdf#114726, tdf#115297,
tdf#113918 and tdf#104141).

Change-Id: Ie00f7552d667e237b3c0f9505ee09cb51e85c43c
Reviewed-on: https://gerrit.libreoffice.org/50828Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

drawinglayer/source/primitive2d/graphicprimitivehelper2d.cxx

@@ -271,7 +271,8 @@ namespace drawinglayer
                                 }
                                 else
                                 {
-                                    maVirtualDeviceMask->DrawBitmap(rAnimBitmap.aPosPix, aMask);
+                                    BitmapEx aExpandVisibilityMask = BitmapEx(aMask, aMask);
+                                    maVirtualDeviceMask->DrawBitmapEx(rAnimBitmap.aPosPix, aExpandVisibilityMask);
                                 }
 
                                 break;
@@ -279,7 +280,8 @@ namespace drawinglayer
                             case Disposal::Previous:
                             {
                                 maVirtualDevice->DrawBitmapEx(rAnimBitmap.aPosPix, rAnimBitmap.aBmpEx);
-                                maVirtualDeviceMask->DrawBitmap(rAnimBitmap.aPosPix, rAnimBitmap.aBmpEx.GetMask());
+                                BitmapEx aExpandVisibilityMask = BitmapEx(rAnimBitmap.aBmpEx.GetMask(), rAnimBitmap.aBmpEx.GetMask());
+                                maVirtualDeviceMask->DrawBitmapEx(rAnimBitmap.aPosPix, aExpandVisibilityMask);
                                 break;
                             }
                         }

vcl/headless/svpgdi.cxx

@@ -1200,39 +1200,8 @@ void SvpSalGraphics::copyBits( const SalTwoRect& rTR,
         cairo_surface_destroy(pCopy);
 }
 
-namespace
-{
-    bool isBlackWhite(const SalBitmap& rBitmap)
-    {
-        const SvpSalBitmap& rSrcBmp = static_cast<const SvpSalBitmap&>(rBitmap);
-        const BitmapBuffer * pSourceBuffer = rSrcBmp.GetBuffer();
-        const BitmapPalette & rPalette = pSourceBuffer->maPalette;
-
-        return (
-            rPalette.GetEntryCount() < 2 ||
-
-            (rPalette.GetEntryCount() == 2 &&
-            rPalette[0] == COL_BLACK &&
-            rPalette[1] == COL_WHITE ) ||
-
-            (rPalette.GetEntryCount() == 2 &&
-            rPalette[1] == COL_BLACK &&
-            rPalette[0] == COL_WHITE )
-            );
-    }
-}
-
 void SvpSalGraphics::drawBitmap(const SalTwoRect& rTR, const SalBitmap& rSourceBitmap)
 {
-    if (rSourceBitmap.GetBitCount() == 1 && isBlackWhite(rSourceBitmap))
-    {
-        // This way we draw only monochrome b/w bitmaps
-        MaskHelper aMask(rSourceBitmap);
-        cairo_surface_t* source = aMask.getMask();
-        copySource(rTR, source);
-        return;
-    }
-
     SourceHelper aSurface(rSourceBitmap);
     cairo_surface_t* source = aSurface.getSurface();
     copySource(rTR, source);