tdf#101181 Implement glow effect on shapes

Glow effect is a color-blurred outline outside of the shape. In ooxml
document it is specified with the <a:glow> element.

The commit contains the following:
- Add support for importing and exporting <a:glow> from ooxml documents.
- Assign new properties to XShape which stores glow-related attributes.
- A new 2D primitive is introduced in module 'drawinglayer' which is
responsible for representing the glow primitive which is to be rendered.
+ A glow primitive is a clone of the original shape which has been
scaled up slightly and a new color has been assigned to it. The
radius of the glow effect and the color is defined in the <a:glow>
element being imported.
- A blur algorithm is introduced in module 'vcl', which is called during
rendering the primitive.
+ The blur algorithm works on a bitmap.
+ Since the algorithm is CPU-intensive, the result is cached in the
processor and it is recalculated only if needed.
- Add support for importing and exporting glow effect to ODF format. For
that, new attributes of element <style:graphic-properties> has been
added:
+ loext:glow, which can have the values "visible" or "hidden"
+ loext:glow-radius: which holds the radius of the glow effect in cm.
+ loext:glow-color: holds the color of the glow effect
- Tests have been added to assert properties after pptx import and
export.

Change-Id: I836aeb5e0f24e2c8d5725834c8c0f98083bc82e7
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89125
Tested-by: Jenkins
Reviewed-by: Tamás Bunth <btomi96@gmail.com>

6 files changed, 88 insertions, 21 deletions

diff --git a/oox/source/drawingml/effectproperties.cxx b/oox/source/drawingml/effectproperties.cxx
index 2ca45bae05a8..e4e9eaddcb32 100644
--- a/oox/source/drawingml/effectproperties.cxx
+++ b/oox/source/drawingml/effectproperties.cxx
@@ -18,6 +18,12 @@
 
 namespace oox::drawingml {
 
+void EffectGlowProperties ::assignUsed(const EffectGlowProperties& rSourceProps)
+{
+    moGlowRad.assignIfUsed( rSourceProps.moGlowRad );
+    moGlowColor.assignIfUsed( rSourceProps.moGlowColor );
+}
+
 void EffectShadowProperties::assignUsed(const EffectShadowProperties& rSourceProps)
 {
     moShadowDist.assignIfUsed( rSourceProps.moShadowDist );
@@ -28,6 +34,7 @@ void EffectShadowProperties::assignUsed(const EffectShadowProperties& rSourcePro
 void EffectProperties::assignUsed( const EffectProperties& rSourceProps )
 {
     maShadow.assignUsed(rSourceProps.maShadow);
+    maGlow.assignUsed(rSourceProps.maGlow);
     if (!rSourceProps.m_Effects.empty())
     {
         m_Effects.clear();
diff --git a/oox/source/drawingml/effectproperties.hxx b/oox/source/drawingml/effectproperties.hxx
index 146214cc9191..c4f39ac8803b 100644
--- a/oox/source/drawingml/effectproperties.hxx
+++ b/oox/source/drawingml/effectproperties.hxx
@@ -20,6 +20,15 @@
 namespace oox {
 namespace drawingml {
 
+struct EffectGlowProperties
+{
+    OptValue< sal_Int64 > moGlowRad; // size of glow effect
+    Color moGlowColor;
+    // TODO saturation and luminance missing
+
+    void assignUsed( const EffectGlowProperties& rSourceProps );
+};
+
 struct EffectShadowProperties
 {
     OptValue< sal_Int64 > moShadowDist;
@@ -42,6 +51,7 @@ struct Effect
 struct EffectProperties
 {
     EffectShadowProperties maShadow;
+    EffectGlowProperties maGlow;
 
     /** Stores all effect properties, including those not supported by core yet */
     std::vector<std::unique_ptr<Effect>> m_Effects;
diff --git a/oox/source/drawingml/effectpropertiescontext.cxx b/oox/source/drawingml/effectpropertiescontext.cxx
index 7941920ed370..6424e99d8458 100644
--- a/oox/source/drawingml/effectpropertiescontext.cxx
+++ b/oox/source/drawingml/effectpropertiescontext.cxx
@@ -15,6 +15,8 @@
 #include <oox/token/namespaces.hxx>
 #include <oox/token/tokens.hxx>
 
+#include <sal/log.hxx>
+
 using namespace ::oox::core;
 using namespace ::com::sun::star::uno;
 using namespace ::com::sun::star::xml::sax;
@@ -97,13 +99,18 @@ ContextHandlerRef EffectPropertiesContext::onCreateContext( sal_Int32 nElement,
         }
         break;
         case A_TOKEN( glow ):
+        {
+            mrEffectProperties.maGlow.moGlowRad = rAttribs.getInteger( XML_rad, 0 );
+            // undo push_back to effects
+            mrEffectProperties.m_Effects.pop_back();
+            return new ColorContext(*this, mrEffectProperties.maGlow.moGlowColor);
+
+        }
         case A_TOKEN( softEdge ):
         case A_TOKEN( reflection ):
         case A_TOKEN( blur ):
         {
-            if( nElement == A_TOKEN( glow ) )
-                mrEffectProperties.m_Effects[nPos]->msName = "glow";
-            else if( nElement == A_TOKEN( softEdge ) )
+            if( nElement == A_TOKEN( softEdge ) )
                 mrEffectProperties.m_Effects[nPos]->msName = "softEdge";
             else if( nElement == A_TOKEN( reflection ) )
                 mrEffectProperties.m_Effects[nPos]->msName = "reflection";
diff --git a/oox/source/drawingml/shape.cxx b/oox/source/drawingml/shape.cxx
index 0cf633369959..1c307ff38371 100644
--- a/oox/source/drawingml/shape.cxx
+++ b/oox/source/drawingml/shape.cxx
@@ -1215,6 +1215,7 @@ Reference< XShape > const & Shape::createAndInsert(
                     aFormat.ShadowWidth = *oShadowDistance;
                     aShapeProps.setProperty(PROP_ShadowFormat, aFormat);
                 }
+
             }
             else if (mbTextBox)
             {
@@ -1464,6 +1465,15 @@ Reference< XShape > const & Shape::createAndInsert(
                 aPropertySet.setAnyProperty(PROP_CharColor, uno::makeAny(nCharColor));
             }
         }
+
+        // Set glow effect properties
+        if ( aEffectProperties.maGlow.moGlowRad.has() )
+        {
+            uno::Reference<beans::XPropertySet> propertySet (mxShape, uno::UNO_QUERY);
+            propertySet->setPropertyValue("GlowEffect", makeAny(true));
+            propertySet->setPropertyValue("GlowEffectRad", makeAny(static_cast<sal_Int32>(aEffectProperties.maGlow.moGlowRad.get())));
+            propertySet->setPropertyValue("GlowEffectColor", makeAny(aEffectProperties.maGlow.moGlowColor.getColor(rGraphicHelper)));
+        }
     }
 
     if( mxShape.is() )
diff --git a/oox/source/export/drawingml.cxx b/oox/source/export/drawingml.cxx
index b4c37d514ece..d80b6a3bea7e 100644
--- a/oox/source/export/drawingml.cxx
+++ b/oox/source/export/drawingml.cxx
@@ -3719,29 +3719,38 @@ void DrawingML::WriteShapeEffects( const Reference< XPropertySet >& rXPropSet )
         bool bHasShadow = false;
         if( GetProperty( rXPropSet, "Shadow" ) )
             mAny >>= bHasShadow;
-        if( bHasShadow )
+        bool bHasGlow = false;
+        if( GetProperty( rXPropSet, "GlowEffect") )
+            mAny >>= bHasGlow;
+        //rXPropSet->getPropertyValue("GlowEffect") >>= bHasGlow;
+
+        if( bHasShadow || bHasGlow )
         {
-            Sequence< PropertyValue > aShadowGrabBag( 3 );
-            Sequence< PropertyValue > aShadowAttribsGrabBag( 2 );
+            mpFS->startElementNS(XML_a, XML_effectLst);
+            if( bHasShadow )
+            {
+                Sequence< PropertyValue > aShadowGrabBag( 3 );
+                Sequence< PropertyValue > aShadowAttribsGrabBag( 2 );
 
-            double dX = +0.0, dY = +0.0;
-            rXPropSet->getPropertyValue( "ShadowXDistance" ) >>= dX;
-            rXPropSet->getPropertyValue( "ShadowYDistance" ) >>= dY;
+                double dX = +0.0, dY = +0.0;
+                rXPropSet->getPropertyValue( "ShadowXDistance" ) >>= dX;
+                rXPropSet->getPropertyValue( "ShadowYDistance" ) >>= dY;
 
-            aShadowAttribsGrabBag[0].Name = "dist";
-            aShadowAttribsGrabBag[0].Value <<= lcl_CalculateDist(dX, dY);
-            aShadowAttribsGrabBag[1].Name = "dir";
-            aShadowAttribsGrabBag[1].Value <<= lcl_CalculateDir(dX, dY);
+                aShadowAttribsGrabBag[0].Name = "dist";
+                aShadowAttribsGrabBag[0].Value <<= lcl_CalculateDist(dX, dY);
+                aShadowAttribsGrabBag[1].Name = "dir";
+                aShadowAttribsGrabBag[1].Value <<= lcl_CalculateDir(dX, dY);
 
-            aShadowGrabBag[0].Name = "Attribs";
-            aShadowGrabBag[0].Value <<= aShadowAttribsGrabBag;
-            aShadowGrabBag[1].Name = "RgbClr";
-            aShadowGrabBag[1].Value = rXPropSet->getPropertyValue( "ShadowColor" );
-            aShadowGrabBag[2].Name = "RgbClrTransparency";
-            aShadowGrabBag[2].Value = rXPropSet->getPropertyValue( "ShadowTransparence" );
+                aShadowGrabBag[0].Name = "Attribs";
+                aShadowGrabBag[0].Value <<= aShadowAttribsGrabBag;
+                aShadowGrabBag[1].Name = "RgbClr";
+                aShadowGrabBag[1].Value = rXPropSet->getPropertyValue( "ShadowColor" );
+                aShadowGrabBag[2].Name = "RgbClrTransparency";
+                aShadowGrabBag[2].Value = rXPropSet->getPropertyValue( "ShadowTransparence" );
 
-            mpFS->startElementNS(XML_a, XML_effectLst);
-            WriteShapeEffect( "outerShdw", aShadowGrabBag );
+                WriteShapeEffect( "outerShdw", aShadowGrabBag );
+            }
+            WriteGlowEffect(rXPropSet);
             mpFS->endElementNS(XML_a, XML_effectLst);
         }
     }
@@ -3796,10 +3805,32 @@ void DrawingML::WriteShapeEffects( const Reference< XPropertySet >& rXPropSet )
                 WriteShapeEffect( rEffect.Name, aEffectProps );
             }
         }
+        WriteGlowEffect(rXPropSet);
+
         mpFS->endElementNS(XML_a, XML_effectLst);
     }
 }
 
+void DrawingML::WriteGlowEffect(const Reference< XPropertySet >& rXPropSet)
+{
+    bool hasGlow = false;
+    rXPropSet->getPropertyValue("GlowEffect") >>= hasGlow;
+    if(!hasGlow)
+        return;
+
+    Sequence< PropertyValue > aGlowAttribs(1);
+    aGlowAttribs[0].Name = "rad";
+    aGlowAttribs[0].Value = rXPropSet->getPropertyValue("GlowEffectRad");
+    Sequence< PropertyValue > aGlowProps(2);
+    aGlowProps[0].Name = "Attribs";
+    aGlowProps[0].Value <<= aGlowAttribs;
+    aGlowProps[1].Name = "RgbClr";
+    aGlowProps[1].Value = rXPropSet->getPropertyValue("GlowEffectColor");
+    // TODO other stuff like saturation or luminance
+
+    WriteShapeEffect("glow", aGlowProps);
+}
+
 void DrawingML::WriteShape3DEffects( const Reference< XPropertySet >& xPropSet )
 {
     // check existence of the grab bag
diff --git a/oox/source/token/properties.txt b/oox/source/token/properties.txt
index 4fc0c5b47c57..4624573d579b 100644
--- a/oox/source/token/properties.txt
+++ b/oox/source/token/properties.txt
@@ -207,6 +207,8 @@ Function
 GapwidthSequence
 GenerateVbaEvents
 Geometry3D
+GlowEffect
+GlowEffectRad
 GradientName
 HatchName
 Graphic