tdf#132246: add basic support for feGaussianBlur

for now only apply it if in="SourceGraphic" is explicitly
used

Change-Id: I3daea354f61ba5f6b3d13da1e7a71e99d51f6729
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152684
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

5 files changed, 130 insertions, 1 deletions

diff --git a/svgio/source/svgreader/svgdocumenthandler.cxx b/svgio/source/svgreader/svgdocumenthandler.cxx
index ac866b37f0d2..5e61693e64c7 100644
--- a/svgio/source/svgreader/svgdocumenthandler.cxx
+++ b/svgio/source/svgreader/svgdocumenthandler.cxx
@@ -41,6 +41,7 @@
 #include <svgstylenode.hxx>
 #include <svgimagenode.hxx>
 #include <svgclippathnode.hxx>
+#include <svgfegaussianblurnode.hxx>
 #include <svgfilternode.hxx>
 #include <svgmasknode.hxx>
 #include <svgmarkernode.hxx>
@@ -341,6 +342,13 @@ namespace
                     mpTarget->parseAttributes(xAttribs);
                     break;
                 }
+                case SVGToken::FeGaussianBlur:
+                {
+                    /// new node for feGaussianBlur
+                    mpTarget = new SvgFeGaussianBlurNode(maDocument, mpTarget);
+                    mpTarget->parseAttributes(xAttribs);
+                    break;
+                }
                 case SVGToken::Filter:
                 {
                     /// new node for Filter
@@ -442,8 +450,9 @@ namespace
                 /// styles (as stylesheets)
                 case SVGToken::Style:
 
-                /// structural elements clip-path, filter and mask
+                /// structural elements clip-path, feGaussianBlur, filter and mask
                 case SVGToken::ClipPathNode:
+                case SVGToken::FeGaussianBlur:
                 case SVGToken::Filter:
                 case SVGToken::Mask:
 
diff --git a/svgio/source/svgreader/svgfegaussianblurnode.cxx b/svgio/source/svgreader/svgfegaussianblurnode.cxx
new file mode 100644
index 000000000000..fff21345c4d8
--- /dev/null
+++ b/svgio/source/svgreader/svgfegaussianblurnode.cxx
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <svgfegaussianblurnode.hxx>
+#include <drawinglayer/primitive2d/softedgeprimitive2d.hxx>
+#include <o3tl/string_view.hxx>
+
+namespace svgio::svgreader
+{
+SvgFeGaussianBlurNode::SvgFeGaussianBlurNode(SvgDocument& rDocument, SvgNode* pParent)
+    : SvgNode(SVGToken::FeGaussianBlur, rDocument, pParent)
+    , maStdDeviation(SvgNumber(0.0))
+    , maIn(In::None)
+{
+}
+
+SvgFeGaussianBlurNode::~SvgFeGaussianBlurNode() {}
+
+void SvgFeGaussianBlurNode::parseAttribute(const OUString& /*rTokenName*/, SVGToken aSVGToken,
+                                           const OUString& aContent)
+{
+    // parse own
+    switch (aSVGToken)
+    {
+        case SVGToken::StdDeviation:
+        {
+            SvgNumber aNum;
+
+            if (readSingleNumber(aContent, aNum))
+            {
+                if (aNum.isPositive())
+                {
+                    maStdDeviation = aNum;
+                }
+            }
+            break;
+        }
+        case SVGToken::In:
+        {
+            if (!aContent.isEmpty())
+            {
+                if (o3tl::equalsIgnoreAsciiCase(o3tl::trim(aContent), u"SourceGraphic"))
+                {
+                    maIn = In::SourceGraphic;
+                }
+            }
+            break;
+        }
+        default:
+        {
+            break;
+        }
+    }
+}
+
+void SvgFeGaussianBlurNode::apply(drawinglayer::primitive2d::Primitive2DContainer& rTarget) const
+{
+    if (maIn == In::SourceGraphic)
+    {
+        const drawinglayer::primitive2d::Primitive2DReference xRef(
+            new drawinglayer::primitive2d::SoftEdgePrimitive2D(maStdDeviation.getNumber(),
+                                                               std::move(rTarget)));
+
+        rTarget = drawinglayer::primitive2d::Primitive2DContainer{ xRef };
+    }
+}
+
+} // end of namespace svgio::svgreader
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svgio/source/svgreader/svgfilternode.cxx b/svgio/source/svgreader/svgfilternode.cxx
index 374feb06247b..8eb0beb65e6b 100644
--- a/svgio/source/svgreader/svgfilternode.cxx
+++ b/svgio/source/svgreader/svgfilternode.cxx
@@ -18,6 +18,7 @@
  */
 
 #include <svgfilternode.hxx>
+#include <svgfegaussianblurnode.hxx>
 
 namespace svgio::svgreader
 {
@@ -28,6 +29,27 @@ SvgFilterNode::SvgFilterNode(SvgDocument& rDocument, SvgNode* pParent)
 
 SvgFilterNode::~SvgFilterNode() {}
 
+void SvgFilterNode::apply(drawinglayer::primitive2d::Primitive2DContainer& rTarget) const
+{
+    if (rTarget.empty())
+        return;
+
+    const auto& rChildren = getChildren();
+    const sal_uInt32 nCount(rChildren.size());
+
+    // apply children's filters
+    for (sal_uInt32 a(0); a < nCount; a++)
+    {
+        SvgNode* pCandidate = rChildren[a].get();
+        if (pCandidate->getType() == SVGToken::FeGaussianBlur)
+        {
+            const SvgFeGaussianBlurNode* pFeGaussianBlurNode
+                = dynamic_cast<const SvgFeGaussianBlurNode*>(pCandidate);
+            pFeGaussianBlurNode->apply(rTarget);
+        }
+    }
+}
+
 } // end of namespace svgio::svgreader
 
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/svgio/source/svgreader/svgstyleattributes.cxx b/svgio/source/svgreader/svgstyleattributes.cxx
index 5a3c9396ae91..eda757af80d3 100644
--- a/svgio/source/svgreader/svgstyleattributes.cxx
+++ b/svgio/source/svgreader/svgstyleattributes.cxx
@@ -1208,6 +1208,12 @@ namespace svgio::svgreader
 
             if(!aSource.empty()) // test again, applied clipPath may have lead to empty geometry
             {
+                const SvgFilterNode* pFilter = accessFilterXLink();
+                if(pFilter)
+                {
+                    pFilter->apply(aSource);
+                }
+
                 const SvgMaskNode* pMask = accessMaskXLink();
                 if(pMask)
                 {
diff --git a/svgio/source/svgreader/svgtoken.cxx b/svgio/source/svgreader/svgtoken.cxx
index a472466b3995..48a0c8eb47df 100644
--- a/svgio/source/svgreader/svgtoken.cxx
+++ b/svgio/source/svgreader/svgtoken.cxx
@@ -34,6 +34,7 @@ namespace svgio::svgreader
         const char aSVGStrXmlns[] = "xmlns";
         const char aSVGStrVersion[] = "version";
         const char aSVGStrId[] = "id";
+        const char aSVGStrIn[] = "in";
         const char aSVGStrRx[] = "rx";
         const char aSVGStrRy[] = "ry";
         const char aSVGStrPoints[] = "points";
@@ -61,6 +62,7 @@ namespace svgio::svgreader
         const char aSVGStrStartOffset[] = "startOffset";
         const char aSVGStrMethod[] = "method";
         const char aSVGStrSpacing[] = "spacing";
+        const char aSVGStrStdDeviation[] = "stdDeviation";
         const char aSVGStrTextAlign[] = "text-align";
         const char aSVGStrPathLength[] = "pathLength";
         const char aSVGStrType[] = "type";
@@ -70,6 +72,7 @@ namespace svgio::svgreader
         const char aSVGStrColor[] = "color";
         const char aSVGStrClipPathNode[] = "clipPath";
         const char aSVGStrClipPathProperty[] = "clip-path";
+        const char aSVGStrFeGaussianBlur[] = "feGaussianBlur";
         const char aSVGStrFilter[] = "filter";
         const char aSVGStrMask[] = "mask";
         const char aSVGStrClipPathUnits[] = "clipPathUnits";
@@ -182,6 +185,7 @@ namespace svgio::svgreader
                 { aSVGStrXmlns, SVGToken::Xmlns },
                 { aSVGStrVersion, SVGToken::Version },
                 { aSVGStrId, SVGToken::Id },
+                { aSVGStrIn, SVGToken::In },
                 { aSVGStrRx, SVGToken::Rx },
                 { aSVGStrRy, SVGToken::Ry },
                 { aSVGStrPoints, SVGToken::Points },
@@ -209,6 +213,7 @@ namespace svgio::svgreader
                 { aSVGStrStartOffset, SVGToken::StartOffset },
                 { aSVGStrMethod, SVGToken::Method },
                 { aSVGStrSpacing, SVGToken::Spacing },
+                { aSVGStrStdDeviation, SVGToken::StdDeviation },
                 { aSVGStrTextAlign, SVGToken::TextAlign },
                 { aSVGStrPathLength, SVGToken::PathLength },
                 { aSVGStrType, SVGToken::Type },
@@ -218,6 +223,7 @@ namespace svgio::svgreader
                 { aSVGStrColor, SVGToken::Color },
                 { aSVGStrClipPathNode, SVGToken::ClipPathNode },
                 { aSVGStrClipPathProperty, SVGToken::ClipPathProperty },
+                { aSVGStrFeGaussianBlur, SVGToken::FeGaussianBlur },
                 { aSVGStrFilter, SVGToken::Filter },
                 { aSVGStrMask, SVGToken::Mask },
                 { aSVGStrClipPathUnits, SVGToken::ClipPathUnits },