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>

5 files changed, 22 insertions, 3 deletions

diff --git a/svx/inc/sdr/attribute/sdrlinefillshadowtextattribute.hxx b/svx/inc/sdr/attribute/sdrlinefillshadowtextattribute.hxx
index 519800e7dd02..f9d7969e519a 100644
--- a/svx/inc/sdr/attribute/sdrlinefillshadowtextattribute.hxx
+++ b/svx/inc/sdr/attribute/sdrlinefillshadowtextattribute.hxx
@@ -41,7 +41,8 @@ namespace drawinglayer
                 const SdrLineStartEndAttribute& rLineStartEnd,
                 const SdrShadowAttribute& rShadow,
                 const FillGradientAttribute& rFillFloatTransGradient,
-                const SdrTextAttribute& rTextAttribute);
+                const SdrTextAttribute& rTextAttribute,
+                const SdrGlowAttribute& rGlow);
             SdrLineFillShadowTextAttribute();
             SdrLineFillShadowTextAttribute(const SdrLineFillShadowTextAttribute& rCandidate);
             SdrLineFillShadowTextAttribute& operator=(const SdrLineFillShadowTextAttribute& rCandidate);
diff --git a/svx/inc/sdr/attribute/sdrlineshadowtextattribute.hxx b/svx/inc/sdr/attribute/sdrlineshadowtextattribute.hxx
index af7df7982422..840b20e44cc9 100644
--- a/svx/inc/sdr/attribute/sdrlineshadowtextattribute.hxx
+++ b/svx/inc/sdr/attribute/sdrlineshadowtextattribute.hxx
@@ -20,6 +20,7 @@
 #pragma once
 
 #include <sdr/attribute/sdrshadowtextattribute.hxx>
+#include <drawinglayer/attribute/sdrglowattribute.hxx>
 #include <drawinglayer/attribute/sdrlineattribute.hxx>
 #include <drawinglayer/attribute/sdrlinestartendattribute.hxx>
 
@@ -39,7 +40,8 @@ namespace drawinglayer
                 const SdrLineAttribute& rLine,
                 const SdrLineStartEndAttribute& rLineStartEnd,
                 const SdrShadowAttribute& rShadow,
-                const SdrTextAttribute& rTextAttribute);
+                const SdrTextAttribute& rTextAttribute,
+                const SdrGlowAttribute& rGlow);
             SdrLineShadowTextAttribute();
             SdrLineShadowTextAttribute(const SdrLineShadowTextAttribute& rCandidate);
             SdrLineShadowTextAttribute& operator=(const SdrLineShadowTextAttribute& rCandidate);
diff --git a/svx/inc/sdr/attribute/sdrshadowtextattribute.hxx b/svx/inc/sdr/attribute/sdrshadowtextattribute.hxx
index c58437b70928..bbcd7e95a501 100644
--- a/svx/inc/sdr/attribute/sdrshadowtextattribute.hxx
+++ b/svx/inc/sdr/attribute/sdrshadowtextattribute.hxx
@@ -21,6 +21,7 @@
 
 #include <drawinglayer/attribute/sdrshadowattribute.hxx>
 #include <sdr/attribute/sdrtextattribute.hxx>
+#include <drawinglayer/attribute/sdrglowattribute.hxx>
 
 
 namespace drawinglayer
@@ -33,10 +34,14 @@ namespace drawinglayer
             SdrShadowAttribute          maShadow;                   // shadow attributes (if used)
             SdrTextAttribute            maTextAttribute;            // text and text attributes (if used)
 
+            // glow effect
+            SdrGlowAttribute            maGlow;
+
         public:
             SdrShadowTextAttribute(
                 const SdrShadowAttribute& rShadow,
-                const SdrTextAttribute& rTextAttribute);
+                const SdrTextAttribute& rTextAttribute,
+                const SdrGlowAttribute& rGlow);
             SdrShadowTextAttribute();
             SdrShadowTextAttribute(const SdrShadowTextAttribute& rCandidate);
             SdrShadowTextAttribute& operator=(const SdrShadowTextAttribute& rCandidate);
@@ -50,6 +55,7 @@ namespace drawinglayer
             // data access
             const SdrShadowAttribute& getShadow() const { return maShadow; }
             const SdrTextAttribute& getText() const { return maTextAttribute; }
+            const SdrGlowAttribute& getGlow() const { return maGlow; }
         };
     } // end of namespace attribute
 } // end of namespace drawinglayer
diff --git a/svx/inc/sdr/primitive2d/sdrattributecreator.hxx b/svx/inc/sdr/primitive2d/sdrattributecreator.hxx
index 1d9e17d60d2a..da0242eed3a5 100644
--- a/svx/inc/sdr/primitive2d/sdrattributecreator.hxx
+++ b/svx/inc/sdr/primitive2d/sdrattributecreator.hxx
@@ -31,6 +31,7 @@ namespace drawinglayer { namespace attribute {
     class SdrLineAttribute;
     class SdrLineStartEndAttribute;
     class SdrShadowAttribute;
+    class SdrGlowAttribute;
     class SdrFillAttribute;
     class SdrTextAttribute;
     class FillGradientAttribute;
@@ -67,6 +68,9 @@ namespace drawinglayer
         attribute::SdrFillAttribute SVXCORE_DLLPUBLIC createNewSdrFillAttribute(
             const SfxItemSet& rSet);
 
+        attribute::SdrGlowAttribute createNewSdrGlowAttribute(
+            const SfxItemSet& rSet);
+
         // #i101508# Support handing over given text-to-border distances
         attribute::SdrTextAttribute createNewSdrTextAttribute(
             const SfxItemSet& rSet,
diff --git a/svx/inc/sdr/primitive2d/sdrdecompositiontools.hxx b/svx/inc/sdr/primitive2d/sdrdecompositiontools.hxx
index f55edda1b7c1..6a2cf1993305 100644
--- a/svx/inc/sdr/primitive2d/sdrdecompositiontools.hxx
+++ b/svx/inc/sdr/primitive2d/sdrdecompositiontools.hxx
@@ -20,6 +20,8 @@
 #pragma once
 
 #include <drawinglayer/primitive2d/baseprimitive2d.hxx>
+#include <drawinglayer/attribute/sdrglowattribute.hxx>
+
 #include <svx/svxdllapi.h>
 
 // predefines
@@ -71,6 +73,10 @@ namespace drawinglayer
             const Primitive2DContainer& rContent,
             const attribute::SdrShadowAttribute& rShadow);
 
+        Primitive2DContainer SVXCORE_DLLPUBLIC createEmbeddedGlowPrimitive(
+            const Primitive2DContainer& rContent,
+            const attribute::SdrGlowAttribute& rGlow);
+
     } // end of namespace primitive2d
 } // end of namespace drawinglayer