Add missing mpAlphaVDev handling

... a pre-requisite for re-implementing soft edge to use mpAlphaVDev
necessary to keep objects' transparency when applying the effect

Change-Id: I56f5c0f2468c32843abbc1f14e06861a22f6919d
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/94662
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

4 files changed, 42 insertions, 5 deletions

diff --git a/vcl/source/outdev/bitmap.cxx b/vcl/source/outdev/bitmap.cxx
index 44d28e15229a..401ebd6a77f2 100644
--- a/vcl/source/outdev/bitmap.cxx
+++ b/vcl/source/outdev/bitmap.cxx
@@ -1051,17 +1051,25 @@ bool OutputDevice::DrawTransformBitmapExDirect(
     const basegfx::B2DPoint aTopY(aFullTransform * basegfx::B2DPoint(0.0, 1.0));
     SalBitmap* pSalSrcBmp = rBitmapEx.GetBitmap().ImplGetSalBitmap().get();
     SalBitmap* pSalAlphaBmp = nullptr;
+    Bitmap aAlphaBitmap;
 
     if(rBitmapEx.IsTransparent())
     {
         if(rBitmapEx.IsAlpha())
         {
-            pSalAlphaBmp = rBitmapEx.GetAlpha().ImplGetSalBitmap().get();
+            aAlphaBitmap = rBitmapEx.GetAlpha();
         }
         else
         {
-            pSalAlphaBmp = rBitmapEx.GetMask().ImplGetSalBitmap().get();
+            aAlphaBitmap = rBitmapEx.GetMask();
         }
+        if (!mpAlphaVDev)
+            pSalAlphaBmp = aAlphaBitmap.ImplGetSalBitmap().get();
+    }
+    else if (mpAlphaVDev)
+    {
+        aAlphaBitmap = Bitmap(rBitmapEx.GetSizePixel(), 1);
+        aAlphaBitmap.Erase(COL_BLACK);
     }
 
     bDone = mpGraphics->DrawTransformedBitmap(
@@ -1072,6 +1080,9 @@ bool OutputDevice::DrawTransformBitmapExDirect(
         pSalAlphaBmp,
         this);
 
+    if (mpAlphaVDev)
+        mpAlphaVDev->DrawTransformBitmapExDirect(aFullTransform, BitmapEx(aAlphaBitmap));
+
     return bDone;
 };
 
diff --git a/vcl/source/outdev/polygon.cxx b/vcl/source/outdev/polygon.cxx
index 60deaceb822c..77e0564ba16f 100644
--- a/vcl/source/outdev/polygon.cxx
+++ b/vcl/source/outdev/polygon.cxx
@@ -338,6 +338,9 @@ void OutputDevice::ImplDrawPolyPolygonWithB2DPolyPolygon(const basegfx::B2DPolyP
 
         if(bSuccess)
         {
+            if (mpAlphaVDev)
+                mpAlphaVDev->ImplDrawPolyPolygonWithB2DPolyPolygon(rB2DPolyPoly);
+
             return;
         }
     }
diff --git a/vcl/source/outdev/polyline.cxx b/vcl/source/outdev/polyline.cxx
index d17056d58e13..672854a9ed55 100644
--- a/vcl/source/outdev/polyline.cxx
+++ b/vcl/source/outdev/polyline.cxx
@@ -342,11 +342,12 @@ bool OutputDevice::DrawPolyLineDirect(
         const basegfx::B2DHomMatrix aTransform(ImplGetDeviceTransformation() * rObjectTransform);
         const bool bPixelSnapHairline((mnAntialiasing & AntialiasingFlags::PixelSnapHairline) && rB2DPolygon.count() < 1000);
 
+        const double fAdjustedTransparency = mpAlphaVDev ? 0 : fTransparency;
         // draw the polyline
         bool bDrawSuccess = mpGraphics->DrawPolyLine(
             aTransform,
             rB2DPolygon,
-            fTransparency,
+            fAdjustedTransparency,
             fLineWidth, // tdf#124848 use LineWidth direct, do not try to solve for zero-case (aka hairline)
             pStroke, // MM01
             eLineJoin,
@@ -370,6 +371,12 @@ bool OutputDevice::DrawPolyLineDirect(
                 const tools::Polygon aToolsPolygon( rB2DPolygon );
                 mpMetaFile->AddAction( new MetaPolyLineAction( aToolsPolygon, aLineInfo ) );
             }
+
+            if (mpAlphaVDev)
+                mpAlphaVDev->DrawPolyLineDirect(rObjectTransform, rB2DPolygon, fLineWidth,
+                                                fTransparency, pStroke, eLineJoin, eLineCap,
+                                                fMiterMinimumAngle, bBypassAACheck);
+
             return true;
         }
     }
diff --git a/vcl/source/outdev/transparent.cxx b/vcl/source/outdev/transparent.cxx
index e35d4dfbf959..a9e2ae080e8c 100644
--- a/vcl/source/outdev/transparent.cxx
+++ b/vcl/source/outdev/transparent.cxx
@@ -248,6 +248,7 @@ void OutputDevice::DrawTransparent(
 
         // create ObjectToDevice transformation
         const basegfx::B2DHomMatrix aFullTransform(ImplGetDeviceTransformation() * rObjectTransform);
+        const double fAdjustedTransparency = mpAlphaVDev ? 0 : fTransparency;
         bool bDrawnOk(true);
 
         if( IsFillColor() )
@@ -255,7 +256,7 @@ void OutputDevice::DrawTransparent(
             bDrawnOk = mpGraphics->DrawPolyPolygon(
                 aFullTransform,
                 aB2DPolyPolygon,
-                fTransparency,
+                fAdjustedTransparency,
                 this);
         }
 
@@ -268,7 +269,7 @@ void OutputDevice::DrawTransparent(
                 mpGraphics->DrawPolyLine(
                     aFullTransform,
                     rPolygon,
-                    fTransparency,
+                    fAdjustedTransparency,
                     0.0, // tdf#124848 hairline
                     nullptr, // MM01
                     basegfx::B2DLineJoin::NONE,
@@ -292,6 +293,21 @@ void OutputDevice::DrawTransparent(
                         static_cast< sal_uInt16 >(fTransparency * 100.0)));
             }
 
+            if (mpAlphaVDev)
+            {
+                const Color aFillCol(mpAlphaVDev->GetFillColor());
+                const Color aLineColor(mpAlphaVDev->GetLineColor());
+                const auto nGreyScale = static_cast<sal_uInt8>(std::round(255 * fTransparency));
+                const Color aNewColor(nGreyScale, nGreyScale, nGreyScale);
+                mpAlphaVDev->SetFillColor(aNewColor);
+                mpAlphaVDev->SetLineColor(aNewColor);
+
+                mpAlphaVDev->DrawTransparent(rObjectTransform, rB2DPolyPoly, fTransparency);
+
+                mpAlphaVDev->SetFillColor(aFillCol);
+                mpAlphaVDev->SetLineColor(aLineColor);
+            }
+
             return;
         }
     }