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>

4 files changed, 17 insertions, 0 deletions

diff --git a/xmloff/inc/xmlsdtypes.hxx b/xmloff/inc/xmlsdtypes.hxx
index b49639d43a94..6b060d322f7c 100644
--- a/xmloff/inc/xmlsdtypes.hxx
+++ b/xmloff/inc/xmlsdtypes.hxx
@@ -68,6 +68,7 @@
 #define XML_SD_TYPE_IMAGE_SCALE_MODE                (XML_SD_TYPES_START + 34 )
 #define XML_SD_TYPE_LINECAP                         (XML_SD_TYPES_START + 35 )
 #define XML_SD_TYPE_FITTOSIZE_AUTOFIT               (XML_SD_TYPES_START + 36 )
+#define XML_SD_TYPE_GLOW                            (XML_SD_TYPES_START + 37 )
 
 //////////////////////////////////////////////////////////////////////////////
 // 3D property types
diff --git a/xmloff/source/core/xmltoken.cxx b/xmloff/source/core/xmltoken.cxx
index 2005e929a684..46125e067982 100644
--- a/xmloff/source/core/xmltoken.cxx
+++ b/xmloff/source/core/xmltoken.cxx
@@ -929,6 +929,9 @@ namespace xmloff::token {
         TOKEN( "gcd",                             XML_GCD ),
         TOKEN( "generator",                       XML_GENERATOR ),
         TOKEN( "geq",                             XML_GEQ ),
+        TOKEN( "glow",                            XML_GLOW ),
+        TOKEN( "glow-radius",                     XML_GLOW_RADIUS ),
+        TOKEN( "glow-color",                      XML_GLOW_COLOR ),
         TOKEN( "gouraud",                         XML_GOURAUD ),
         TOKEN( "gradient",                        XML_GRADIENT ),
         TOKEN( "angle",                           XML_GRADIENT_ANGLE ),
diff --git a/xmloff/source/draw/sdpropls.cxx b/xmloff/source/draw/sdpropls.cxx
index 19b325f8e1c5..4cedc7c148c0 100644
--- a/xmloff/source/draw/sdpropls.cxx
+++ b/xmloff/source/draw/sdpropls.cxx
@@ -152,6 +152,11 @@ const XMLPropertyMapEntry aXMLSDProperties[] =
     GMAP( "ShadowColor",                        XML_NAMESPACE_DRAW, XML_SHADOW_COLOR,           XML_TYPE_COLOR, 0 ),
     GMAP( "ShadowTransparence",             XML_NAMESPACE_DRAW, XML_SHADOW_OPACITY, XML_TYPE_NEG_PERCENT, 0 ),
 
+    // glow attributes
+    GMAPV( "GlowEffect",                       XML_NAMESPACE_LO_EXT, XML_GLOW,                 XML_SD_TYPE_GLOW  , 0, SvtSaveOptions::ODFVER_012_EXT_COMPAT ),
+    GMAPV( "GlowEffectRad",                    XML_NAMESPACE_LO_EXT, XML_GLOW_RADIUS,          XML_TYPE_MEASURE  , 0, SvtSaveOptions::ODFVER_012_EXT_COMPAT ),
+    GMAPV( "GlowEffectColor",                  XML_NAMESPACE_LO_EXT, XML_GLOW_COLOR,           XML_TYPE_COLOR    , 0, SvtSaveOptions::ODFVER_012_EXT_COMPAT ),
+
     // graphic attributes
     GMAP( "GraphicColorMode",               XML_NAMESPACE_DRAW, XML_COLOR_MODE,             XML_TYPE_COLOR_MODE, 0 ), // exists in SW, too, with same property name
     GMAP( "AdjustLuminance",                XML_NAMESPACE_DRAW, XML_LUMINANCE,              XML_TYPE_PERCENT16, 0 ), // signed? exists in SW, too, with same property name
@@ -1019,6 +1024,11 @@ const XMLPropertyHandler* XMLSdPropHdlFactory::GetPropertyHandler( sal_Int32 nTy
                 pHdl = new XMLNamedBoolPropertyHdl( GetXMLToken(XML_VISIBLE), GetXMLToken(XML_HIDDEN) );
                 break;
             }
+            case XML_SD_TYPE_GLOW :
+            {
+                pHdl = new XMLNamedBoolPropertyHdl( GetXMLToken(XML_VISIBLE), GetXMLToken(XML_HIDDEN) );
+                break;
+            }
             case XML_TYPE_SD_MIRROR:
             {
                 pHdl = new XMLNamedBoolPropertyHdl( GetXMLToken(XML_HORIZONTAL), GetXMLToken(XML_NONE) );
diff --git a/xmloff/source/token/tokens.txt b/xmloff/source/token/tokens.txt
index 34e145b30e46..31dae860a15e 100644
--- a/xmloff/source/token/tokens.txt
+++ b/xmloff/source/token/tokens.txt
@@ -847,6 +847,9 @@ gap-width
 gcd
 generator
 geq
+glow
+glow-radius
+glow-color
 gouraud
 gradient
 angle