Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 259 insertions, 0 deletions

diff --git a/svgio/source/svgreader/svgclippathnode.cxx b/svgio/source/svgreader/svgclippathnode.cxx
new file mode 100644
index 000000000..31ac632d3
--- /dev/null
+++ b/svgio/source/svgreader/svgclippathnode.cxx
@@ -0,0 +1,259 @@
+/* -*- 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 <svgclippathnode.hxx>
+#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
+#include <drawinglayer/primitive2d/maskprimitive2d.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
+#include <drawinglayer/geometry/viewinformation2d.hxx>
+#include <drawinglayer/processor2d/contourextractor2d.hxx>
+#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
+#include <basegfx/polygon/b2dpolygontools.hxx>
+
+namespace svgio::svgreader
+{
+        SvgClipPathNode::SvgClipPathNode(
+            SvgDocument& rDocument,
+            SvgNode* pParent)
+        :   SvgNode(SVGToken::ClipPathNode, rDocument, pParent),
+            maSvgStyleAttributes(*this),
+            maClipPathUnits(SvgUnits::userSpaceOnUse)
+        {
+        }
+
+        SvgClipPathNode::~SvgClipPathNode()
+        {
+        }
+
+        const SvgStyleAttributes* SvgClipPathNode::getSvgStyleAttributes() const
+        {
+            return &maSvgStyleAttributes;
+        }
+
+        void SvgClipPathNode::parseAttribute(const OUString& rTokenName, SVGToken aSVGToken, const OUString& aContent)
+        {
+            // call parent
+            SvgNode::parseAttribute(rTokenName, aSVGToken, aContent);
+
+            // read style attributes
+            maSvgStyleAttributes.parseStyleAttribute(aSVGToken, aContent, false);
+
+            // parse own
+            switch(aSVGToken)
+            {
+                case SVGToken::Style:
+                {
+                    readLocalCssStyle(aContent);
+                    break;
+                }
+                case SVGToken::Transform:
+                {
+                    const basegfx::B2DHomMatrix aMatrix(readTransform(aContent, *this));
+
+                    if(!aMatrix.isIdentity())
+                    {
+                        setTransform(aMatrix);
+                    }
+                    break;
+                }
+                case SVGToken::ClipPathUnits:
+                {
+                    if(!aContent.isEmpty())
+                    {
+                        if(aContent.match(commonStrings::aStrUserSpaceOnUse))
+                        {
+                            setClipPathUnits(SvgUnits::userSpaceOnUse);
+                        }
+                        else if(aContent.match(commonStrings::aStrObjectBoundingBox))
+                        {
+                            setClipPathUnits(SvgUnits::objectBoundingBox);
+                        }
+                    }
+                    break;
+                }
+                default:
+                {
+                    break;
+                }
+            }
+        }
+
+        void SvgClipPathNode::decomposeSvgNode(drawinglayer::primitive2d::Primitive2DContainer& rTarget, bool bReferenced) const
+        {
+            drawinglayer::primitive2d::Primitive2DContainer aNewTarget;
+
+            // decompose children
+            SvgNode::decomposeSvgNode(aNewTarget, bReferenced);
+
+            if(aNewTarget.empty())
+                return;
+
+            if(getTransform())
+            {
+                // create embedding group element with transformation
+                const drawinglayer::primitive2d::Primitive2DReference xRef(
+                    new drawinglayer::primitive2d::TransformPrimitive2D(
+                        *getTransform(),
+                        std::move(aNewTarget)));
+
+                rTarget.push_back(xRef);
+            }
+            else
+            {
+                // append to current target
+                rTarget.append(aNewTarget);
+            }
+        }
+
+        void SvgClipPathNode::apply(
+            drawinglayer::primitive2d::Primitive2DContainer& rContent,
+            const std::optional<basegfx::B2DHomMatrix>& pTransform) const
+        {
+            if (rContent.empty() || Display::None == getDisplay())
+                return;
+
+            const drawinglayer::geometry::ViewInformation2D aViewInformation2D;
+            drawinglayer::primitive2d::Primitive2DContainer aClipTarget;
+            basegfx::B2DPolyPolygon aClipPolyPolygon;
+
+            // get clipPath definition as primitives
+            decomposeSvgNode(aClipTarget, true);
+
+            if(!aClipTarget.empty())
+            {
+                // extract filled polygons as base for a mask PolyPolygon
+                drawinglayer::processor2d::ContourExtractor2D aExtractor(aViewInformation2D, true);
+
+                aExtractor.process(aClipTarget);
+
+                const basegfx::B2DPolyPolygonVector& rResult(aExtractor.getExtractedContour());
+                const sal_uInt32 nSize(rResult.size());
+
+                if(nSize > 1)
+                {
+                    // merge to single clipPolyPolygon
+                    aClipPolyPolygon = basegfx::utils::mergeToSinglePolyPolygon(rResult);
+                }
+                else
+                {
+                    aClipPolyPolygon = rResult[0];
+                }
+            }
+
+            if(aClipPolyPolygon.count())
+            {
+                if (SvgUnits::objectBoundingBox == getClipPathUnits())
+                {
+                    // clip is object-relative, transform using content transformation
+                    const basegfx::B2DRange aContentRange(rContent.getB2DRange(aViewInformation2D));
+
+                    aClipPolyPolygon.transform(
+                        basegfx::utils::createScaleTranslateB2DHomMatrix(
+                            aContentRange.getRange(),
+                            aContentRange.getMinimum()));
+                }
+                else // userSpaceOnUse
+                {
+                    // #i124852#
+                    if(pTransform)
+                    {
+                        aClipPolyPolygon.transform(*pTransform);
+                    }
+                }
+
+                // #i124313# try to avoid creating an embedding to a MaskPrimitive2D if
+                // possible; MaskPrimitive2D processing is potentially expensive
+                bool bCreateEmbedding(true);
+                bool bAddContent(true);
+
+                if(basegfx::utils::isRectangle(aClipPolyPolygon))
+                {
+                    // ClipRegion is a rectangle, thus it is not expensive to tell
+                    // if the content is completely inside or outside of it; get ranges
+                    const basegfx::B2DRange aClipRange(aClipPolyPolygon.getB2DRange());
+                    const basegfx::B2DRange aContentRange(
+                        rContent.getB2DRange(
+                            aViewInformation2D));
+
+                    if(aClipRange.isInside(aContentRange))
+                    {
+                        // completely contained, no need to clip at all, so no need for embedding
+                        bCreateEmbedding = false;
+                    }
+                    else if(aClipRange.overlaps(aContentRange))
+                    {
+                        // overlap; embedding needed. ClipRegion can be minimized by using
+                        // the intersection of the ClipRange and the ContentRange. Minimizing
+                        // the ClipRegion potentially enhances further processing since
+                        // usually clip operations are expensive.
+                        basegfx::B2DRange aCommonRange(aContentRange);
+
+                        aCommonRange.intersect(aClipRange);
+                        aClipPolyPolygon = basegfx::B2DPolyPolygon(basegfx::utils::createPolygonFromRect(aCommonRange));
+                    }
+                    else
+                    {
+                        // not inside and no overlap -> completely outside
+                        // no need for embedding, no need for content at all
+                        bCreateEmbedding = false;
+                        bAddContent = false;
+                    }
+                }
+                else
+                {
+                    // ClipRegion is not a simple rectangle, it would be possible but expensive to
+                    // tell if the content needs clipping or not. It is also dependent of
+                    // the content's decomposition. To do this, a processor would be needed that
+                    // is capable if processing the given sequence of primitives and decide
+                    // if all is inside or all is outside. Such a ClipProcessor could be written,
+                    // but for now just create the embedding
+                }
+
+                if(bCreateEmbedding)
+                {
+                    // redefine target. Use MaskPrimitive2D with created clip
+                    // geometry. Using the automatically set mbIsClipPathContent at
+                    // SvgStyleAttributes the clip definition is without fill, stroke,
+                    // and strokeWidth and forced to black
+                    drawinglayer::primitive2d::Primitive2DReference xEmbedTransparence(
+                        new drawinglayer::primitive2d::MaskPrimitive2D(
+                            aClipPolyPolygon,
+                            std::move(rContent)));
+
+                    rContent = drawinglayer::primitive2d::Primitive2DContainer { xEmbedTransparence };
+                }
+                else
+                {
+                    if(!bAddContent)
+                    {
+                        rContent.clear();
+                    }
+                }
+            }
+            else
+            {
+                // An empty clipping path will completely clip away the element that had
+                // the clip-path property applied. (Svg spec)
+                rContent.clear();
+            }
+        }
+
+} // end of namespace svgio::svgreader
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */