CairoSDPR: Support direct transparency for gradients

FillGradientPrimitive2D/ and PolyPolygonGradientPrimitive2D
now support both alphas, a gradientAlpha and a unified one.
This allows a processor to directly handle a gradient with
a unifiedAlpha if he wants. Adapted other places accordingly.

NOTE: In VclMetafileProcessor2D handling of the primitive
PolyPolygonGradientPrimitive2D has to do a local compromize,
see comment there.

Change-Id: I536f4935dafde0369f768dbd281d547b7bb08eb4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/171052
Reviewed-by: Armin Le Grand <Armin.Le.Grand@me.com>
Tested-by: Jenkins

2 files changed, 17 insertions, 3 deletions

diff --git a/include/drawinglayer/primitive2d/PolyPolygonGradientPrimitive2D.hxx b/include/drawinglayer/primitive2d/PolyPolygonGradientPrimitive2D.hxx
index 13afc0616016..31b4374dbc00 100644
--- a/include/drawinglayer/primitive2d/PolyPolygonGradientPrimitive2D.hxx
+++ b/include/drawinglayer/primitive2d/PolyPolygonGradientPrimitive2D.hxx
@@ -49,6 +49,9 @@ private:
     /// evtl. fitting alphaGradient definition
     attribute::FillGradientAttribute maAlphaGradient;
 
+    /// the transparency in range [0.0 .. 1.0]
+    double mfTransparency;
+
     /// local decomposition.
     virtual Primitive2DReference
     create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const override;
@@ -60,16 +63,20 @@ public:
     PolyPolygonGradientPrimitive2D(basegfx::B2DPolyPolygon aPolyPolygon,
                                    const basegfx::B2DRange& rDefinitionRange,
                                    const attribute::FillGradientAttribute& rFillGradient,
-                                   const attribute::FillGradientAttribute* pAlphaGradient
-                                   = nullptr);
+                                   const attribute::FillGradientAttribute* pAlphaGradient = nullptr,
+                                   double fTransparency = 0.0);
 
     /// data read access
     const basegfx::B2DPolyPolygon& getB2DPolyPolygon() const { return maPolyPolygon; }
     const basegfx::B2DRange& getDefinitionRange() const { return maDefinitionRange; }
     const attribute::FillGradientAttribute& getFillGradient() const { return maFillGradient; }
+
     const attribute::FillGradientAttribute& getAlphaGradient() const { return maAlphaGradient; }
     bool hasAlphaGradient() const { return !maAlphaGradient.isDefault(); }
 
+    double getTransparency() const { return mfTransparency; }
+    bool hasTransparency() const { return !basegfx::fTools::equalZero(mfTransparency); }
+
     /// compare operator
     virtual bool operator==(const BasePrimitive2D& rPrimitive) const override;
 
diff --git a/include/drawinglayer/primitive2d/fillgradientprimitive2d.hxx b/include/drawinglayer/primitive2d/fillgradientprimitive2d.hxx
index 41b8c91f507f..0654801e8ef8 100644
--- a/include/drawinglayer/primitive2d/fillgradientprimitive2d.hxx
+++ b/include/drawinglayer/primitive2d/fillgradientprimitive2d.hxx
@@ -70,6 +70,8 @@ namespace drawinglayer::primitive2d
             /// evtl. fitting alphaGradient definition
             attribute::FillGradientAttribute        maAlphaGradient;
 
+            /// the transparency in range [0.0 .. 1.0]
+            double mfTransparency;
 
         protected:
             /// local helper
@@ -93,15 +95,20 @@ namespace drawinglayer::primitive2d
                 const basegfx::B2DRange& rOutputRange,
                 const basegfx::B2DRange& rDefinitionRange,
                 const attribute::FillGradientAttribute& rFillGradient,
-                const attribute::FillGradientAttribute* pAlphaGradient = nullptr);
+                const attribute::FillGradientAttribute* pAlphaGradient = nullptr,
+                double fTransparency = 0.0);
 
             /// data read access
             const basegfx::B2DRange& getOutputRange() const { return maOutputRange; }
             const basegfx::B2DRange& getDefinitionRange() const { return maDefinitionRange; }
             const attribute::FillGradientAttribute& getFillGradient() const { return maFillGradient; }
+
             const attribute::FillGradientAttribute& getAlphaGradient() const { return maAlphaGradient; }
             bool hasAlphaGradient() const { return !maAlphaGradient.isDefault(); }
 
+            double getTransparency() const { return mfTransparency; }
+            bool hasTransparency() const { return !basegfx::fTools::equalZero(mfTransparency); }
+
             /// compare operator
             virtual bool operator==(const BasePrimitive2D& rPrimitive) const override final;