tdf#156066: Add support for feDropShadow filter

Change-Id: I0b2772a7211efb91821853e3369cfc3a5ef6a932
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/153727
Tested-by: Jenkins
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>

4 files changed, 165 insertions, 1 deletions

diff --git a/svgio/source/svgreader/svgdocumenthandler.cxx b/svgio/source/svgreader/svgdocumenthandler.cxx
index 7883383c5287..a070540e68eb 100644
--- a/svgio/source/svgreader/svgdocumenthandler.cxx
+++ b/svgio/source/svgreader/svgdocumenthandler.cxx
@@ -42,6 +42,7 @@
 #include <svgimagenode.hxx>
 #include <svgclippathnode.hxx>
 #include <svgfecolormatrixnode.hxx>
+#include <svgfedropshadownode.hxx>
 #include <svgfefloodnode.hxx>
 #include <svgfegaussianblurnode.hxx>
 #include <svgfeoffsetnode.hxx>
@@ -341,6 +342,13 @@ namespace
                     mpTarget->parseAttributes(xAttribs);
                     break;
                 }
+                case SVGToken::FeDropShadow:
+                {
+                    /// new node for feDropShadow
+                    mpTarget = new SvgFeDropShadowNode(maDocument, mpTarget);
+                    mpTarget->parseAttributes(xAttribs);
+                    break;
+                }
                 case SVGToken::FeFlood:
                 {
                     /// new node for feFlood
@@ -469,6 +477,7 @@ namespace
 
                 /// structural elements for filters
                 case SVGToken::FeColorMatrix:
+                case SVGToken::FeDropShadow:
                 case SVGToken::FeFlood:
                 case SVGToken::FeGaussianBlur:
                 case SVGToken::FeOffset:
diff --git a/svgio/source/svgreader/svgfedropshadownode.cxx b/svgio/source/svgreader/svgfedropshadownode.cxx
new file mode 100644
index 000000000000..56dd5dcf9587
--- /dev/null
+++ b/svgio/source/svgreader/svgfedropshadownode.cxx
@@ -0,0 +1,147 @@
+/* -*- 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 <drawinglayer/primitive2d/Primitive2DContainer.hxx>
+#include <drawinglayer/primitive2d/shadowprimitive2d.hxx>
+#include <drawinglayer/primitive2d/unifiedtransparenceprimitive2d.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+#include <svgfedropshadownode.hxx>
+#include <o3tl/string_view.hxx>
+
+namespace svgio::svgreader
+{
+SvgFeDropShadowNode::SvgFeDropShadowNode(SvgDocument& rDocument, SvgNode* pParent)
+    : SvgNode(SVGToken::FeDropShadow, rDocument, pParent)
+    , maDx(0.0)
+    , maDy(0.0)
+    , maStdDeviation(0.0)
+    , maFloodColor(SvgPaint())
+    , maFloodOpacity(1.0)
+{
+}
+
+SvgFeDropShadowNode::~SvgFeDropShadowNode() {}
+
+void SvgFeDropShadowNode::parseAttribute(const OUString& /*rTokenName*/, SVGToken aSVGToken,
+                                         const OUString& aContent)
+{
+    // parse own
+    switch (aSVGToken)
+    {
+        case SVGToken::Style:
+        {
+            readLocalCssStyle(aContent);
+            break;
+        }
+        case SVGToken::Dx:
+        {
+            SvgNumber aNum;
+
+            if (readSingleNumber(aContent, aNum))
+            {
+                maDx = aNum;
+            }
+            break;
+        }
+        case SVGToken::Dy:
+        {
+            SvgNumber aNum;
+
+            if (readSingleNumber(aContent, aNum))
+            {
+                maDy = aNum;
+            }
+            break;
+        }
+        case SVGToken::StdDeviation:
+        {
+            SvgNumber aNum;
+
+            if (readSingleNumber(aContent, aNum))
+            {
+                maStdDeviation = aNum;
+            }
+            break;
+        }
+        case SVGToken::FloodColor:
+        {
+            SvgPaint aSvgPaint;
+            OUString aURL;
+            SvgNumber aOpacity;
+
+            if (readSvgPaint(aContent, aSvgPaint, aURL, aOpacity))
+            {
+                maFloodColor = aSvgPaint;
+            }
+            break;
+        }
+        case SVGToken::FloodOpacity:
+        {
+            SvgNumber aNum;
+
+            if (readSingleNumber(aContent, aNum))
+            {
+                maFloodOpacity = SvgNumber(std::clamp(aNum.getNumber(), 0.0, 1.0), aNum.getUnit(),
+                                           aNum.isSet());
+            }
+            break;
+        }
+
+        default:
+        {
+            break;
+        }
+    }
+}
+
+void SvgFeDropShadowNode::apply(drawinglayer::primitive2d::Primitive2DContainer& rTarget) const
+{
+    basegfx::B2DHomMatrix aTransform;
+    if (maDx.isSet() || maDy.isSet())
+    {
+        aTransform.translate(maDx.solve(*this, NumberType::xcoordinate),
+                             maDy.solve(*this, NumberType::ycoordinate));
+    }
+
+    drawinglayer::primitive2d::Primitive2DContainer aTempTarget;
+
+    // Create the shadow
+    aTempTarget.append(drawinglayer::primitive2d::Primitive2DReference(
+        new drawinglayer::primitive2d::ShadowPrimitive2D(
+            aTransform, maFloodColor.getBColor(), maStdDeviation.getNumber(),
+            drawinglayer::primitive2d::Primitive2DContainer(rTarget))));
+
+    const double fOpacity(maFloodOpacity.solve(*this));
+    if (basegfx::fTools::less(fOpacity, 1.0))
+    {
+        // Apply transparence to the shadow
+        aTempTarget.append(drawinglayer::primitive2d::Primitive2DReference(
+            new drawinglayer::primitive2d::UnifiedTransparencePrimitive2D(std::move(aTempTarget),
+                                                                          1.0 - fOpacity)));
+    }
+
+    // Append the original target
+    aTempTarget.append(rTarget);
+
+    rTarget = aTempTarget;
+}
+
+} // 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 6ff71f002e73..3afdc6b0b524 100644
--- a/svgio/source/svgreader/svgfilternode.cxx
+++ b/svgio/source/svgreader/svgfilternode.cxx
@@ -19,6 +19,7 @@
 
 #include <svgfilternode.hxx>
 #include <svgfecolormatrixnode.hxx>
+#include <svgfedropshadownode.hxx>
 #include <svgfefloodnode.hxx>
 #include <svgfegaussianblurnode.hxx>
 #include <svgfeoffsetnode.hxx>
@@ -67,6 +68,12 @@ void SvgFilterNode::apply(drawinglayer::primitive2d::Primitive2DContainer& rTarg
             const SvgFeFloodNode& rFeFloodNode = dynamic_cast<const SvgFeFloodNode&>(*pCandidate);
             rFeFloodNode.apply(rTarget);
         }
+        else if (pCandidate->getType() == SVGToken::FeDropShadow)
+        {
+            const SvgFeDropShadowNode& rFeDropShadowNode
+                = dynamic_cast<const SvgFeDropShadowNode&>(*pCandidate);
+            rFeDropShadowNode.apply(rTarget);
+        }
     }
 }
 
diff --git a/svgio/source/svgreader/svgtoken.cxx b/svgio/source/svgreader/svgtoken.cxx
index 7a49896b0ed1..2383a6d79abd 100644
--- a/svgio/source/svgreader/svgtoken.cxx
+++ b/svgio/source/svgreader/svgtoken.cxx
@@ -28,7 +28,7 @@ namespace svgio::svgreader
 constexpr const std::u16string_view constToken_Title = u"title";
 constexpr const std::u16string_view constToken_Desc = u"desc";
 
-constexpr frozen::unordered_map<std::u16string_view, SVGToken, 143> aSVGTokenMapperList
+constexpr frozen::unordered_map<std::u16string_view, SVGToken, 144> aSVGTokenMapperList
 {
     { u"width", SVGToken::Width },
     { u"height", SVGToken::Height },
@@ -81,6 +81,7 @@ constexpr frozen::unordered_map<std::u16string_view, SVGToken, 143> aSVGTokenMap
     { u"clipPath", SVGToken::ClipPathNode },
     { u"clip-path", SVGToken::ClipPathProperty },
     { u"feColorMatrix", SVGToken::FeColorMatrix },
+    { u"feDropShadow", SVGToken::FeDropShadow },
     { u"feFlood", SVGToken::FeFlood },
     { u"feGaussianBlur", SVGToken::FeGaussianBlur },
     { u"feOffset", SVGToken::FeOffset },