drawinglayer: add transparency support to BackgroundColorPrimitive2D

Impress has tools Color that is wrapped in this primitive, then later
drawinglayer::processor2d::VclPixelProcessor2D::processBasePrimitive2D()
converts it back to tools Color. Problem is that the primitive uses basegfx
BColor, so the alpha channel is lost.

Add member and API to survive this roundtrip.

Change-Id: I940e60f6e352022306abac3223636d19dd859355

1 files changed, 4 insertions, 1 deletions

diff --git a/include/drawinglayer/primitive2d/backgroundcolorprimitive2d.hxx b/include/drawinglayer/primitive2d/backgroundcolorprimitive2d.hxx
index 3b789eb00bcb..def2b431c48d 100644
--- a/include/drawinglayer/primitive2d/backgroundcolorprimitive2d.hxx
+++ b/include/drawinglayer/primitive2d/backgroundcolorprimitive2d.hxx
@@ -48,6 +48,7 @@ namespace drawinglayer
         private:
             /// the fill color to use
             basegfx::BColor                             maBColor;
+            double mfTransparency;
 
             /// the last used viewInformation, used from getDecomposition for buffering
             basegfx::B2DRange                           maLastViewport;
@@ -59,10 +60,12 @@ namespace drawinglayer
         public:
             /// constructor
             explicit BackgroundColorPrimitive2D(
-                const basegfx::BColor& rBColor);
+                const basegfx::BColor& rBColor,
+                double fTransparency = 0);
 
             /// data read access
             const basegfx::BColor& getBColor() const { return maBColor; }
+            double getTransparency() const { return mfTransparency; }
 
             /// compare operator
             virtual bool operator==(const BasePrimitive2D& rPrimitive) const SAL_OVERRIDE;