Revert "Unused code removal DrawGradientWallpaper"

Seems to be used, since IsGradient() actually can be true.

This reverts commit fe4412c8.

include/vcl/outdev.hxx

@@ -999,6 +999,9 @@ public:
     virtual void                Erase();
     virtual void                Erase( const Rectangle& rRect ) { DrawWallpaper( rRect, GetBackground() ); }
 
+protected:
+    virtual void                DrawGradientWallpaper( long nX, long nY, long nWidth, long nHeight, const Wallpaper& rWallpaper );
+
 private:
     SAL_DLLPRIVATE void         DrawWallpaper( long nX, long nY, long nWidth, long nHeight, const Wallpaper& rWallpaper );
     SAL_DLLPRIVATE void         DrawColorWallpaper( long nX, long nY, long nWidth, long nHeight, const Wallpaper& rWallpaper );

include/vcl/window.hxx

@@ -812,6 +812,12 @@ protected:
     virtual void                        ClipToPaintRegion( Rectangle& rDstRect ) override;
     virtual bool                        UsePolyPolygonForComplexGradient() override;
 
+    virtual void DrawGradientWallpaper(long nX, long nY, long nWidth, long nHeight,
+                                       const Wallpaper& rWallpaper) override
+    {
+        OutputDevice::DrawGradientWallpaper(nX, nY, nWidth, nHeight, rWallpaper);
+    }
+
     virtual void ApplySettings(vcl::RenderContext& rRenderContext);
 public:
     bool                                HasMirroredGraphics() const override;

vcl/source/outdev/wallpaper.cxx

@@ -60,6 +60,8 @@ void OutputDevice::DrawWallpaper( long nX, long nY,
 
     if( rWallpaper.IsBitmap() )
         DrawBitmapWallpaper( nX, nY, nWidth, nHeight, rWallpaper );
+    else if( rWallpaper.IsGradient() )
+        DrawGradientWallpaper( nX, nY, nWidth, nHeight, rWallpaper );
     else
         DrawColorWallpaper(  nX, nY, nWidth, nHeight, rWallpaper );
 }
@@ -117,6 +119,7 @@ void OutputDevice::DrawBitmapWallpaper( long nX, long nY,
     const WallpaperStyle eStyle = rWallpaper.GetStyle();
     const bool bOldMap = mbMap;
     bool bDrawn = false;
+    bool bDrawGradientBackground = false;
     bool bDrawColorBackground = false;
 
     if( pCached )
@@ -131,24 +134,34 @@ void OutputDevice::DrawBitmapWallpaper( long nX, long nY,
     // draw background
     if( bTransparent )
     {
-        if( !pCached && !rWallpaper.GetColor().GetTransparency() )
+        if( rWallpaper.IsGradient() )
+            bDrawGradientBackground = true;
+        else
         {
-            ScopedVclPtrInstance< VirtualDevice > aVDev(  *this  );
-            aVDev->SetBackground( rWallpaper.GetColor() );
-            aVDev->SetOutputSizePixel( Size( nBmpWidth, nBmpHeight ) );
-            aVDev->DrawBitmapEx( Point(), aBmpEx );
-            aBmpEx = aVDev->GetBitmap( Point(), aVDev->GetOutputSizePixel() );
-        }
+            if( !pCached && !rWallpaper.GetColor().GetTransparency() )
+            {
+                ScopedVclPtrInstance< VirtualDevice > aVDev(  *this  );
+                aVDev->SetBackground( rWallpaper.GetColor() );
+                aVDev->SetOutputSizePixel( Size( nBmpWidth, nBmpHeight ) );
+                aVDev->DrawBitmapEx( Point(), aBmpEx );
+                aBmpEx = aVDev->GetBitmap( Point(), aVDev->GetOutputSizePixel() );
+            }
 
-        bDrawColorBackground = true;
+            bDrawColorBackground = true;
+        }
     }
     else if( eStyle != WallpaperStyle::Tile && eStyle != WallpaperStyle::Scale )
     {
-        bDrawColorBackground = true;
+        if( rWallpaper.IsGradient() )
+            bDrawGradientBackground = true;
+        else
+            bDrawColorBackground = true;
     }
 
     // background of bitmap?
-    if( bDrawColorBackground && bTransparent )
+    if( bDrawGradientBackground )
+        DrawGradientWallpaper( nX, nY, nWidth, nHeight, rWallpaper );
+    else if( bDrawColorBackground && bTransparent )
     {
         DrawColorWallpaper( nX, nY, nWidth, nHeight, rWallpaper );
         bDrawColorBackground = false;
@@ -330,4 +343,28 @@ void OutputDevice::DrawBitmapWallpaper( long nX, long nY,
     mpMetaFile = pOldMetaFile;
 }
 
+void OutputDevice::DrawGradientWallpaper( long nX, long nY,
+                                          long nWidth, long nHeight,
+                                          const Wallpaper& rWallpaper )
+{
+    assert(!is_double_buffered_window());
+
+    Rectangle aBound;
+    GDIMetaFile* pOldMetaFile = mpMetaFile;
+    const bool bOldMap = mbMap;
+
+    aBound = Rectangle( Point( nX, nY ), Size( nWidth, nHeight ) );
+
+    mpMetaFile = NULL;
+    EnableMapMode( false );
+    Push( PushFlags::CLIPREGION );
+    IntersectClipRegion( Rectangle( Point( nX, nY ), Size( nWidth, nHeight ) ) );
+
+    DrawGradient( aBound, rWallpaper.GetGradient() );
+
+    Pop();
+    EnableMapMode( bOldMap );
+    mpMetaFile = pOldMetaFile;
+}
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */