svgio visitor, add draw commands and create the from svg

Adds a visitor for svgio for visiting svg nodes and create something
useful from them.

Basic draw commands - a tree of draw commands (with sub-pixel
precision support) just to store a simple definition for drawing.

Adds a svg draw visitor and create draw commands from the svg
structure and expose the commands through UNO API.

Change-Id: I073e891a2cffdd76d4e3b838590e3a19c998e9bf
Reviewed-on: https://gerrit.libreoffice.org/68770
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

2 files changed, 109 insertions, 0 deletions

diff --git a/svgio/source/svgreader/svgnode.cxx b/svgio/source/svgreader/svgnode.cxx
index 88b9a72ec196..cb30c3111131 100644
--- a/svgio/source/svgreader/svgnode.cxx
+++ b/svgio/source/svgreader/svgnode.cxx
@@ -673,6 +673,10 @@ namespace svgio
             return XmlSpace_default;
         }
 
+        void SvgNode::accept(Visitor & rVisitor)
+        {
+            rVisitor.visit(*this);
+        }
     } // end of namespace svgreader
 } // end of namespace svgio
 
diff --git a/svgio/source/svgreader/svgvisitor.cxx b/svgio/source/svgreader/svgvisitor.cxx
new file mode 100644
index 000000000000..841a1cb7022e
--- /dev/null
+++ b/svgio/source/svgreader/svgvisitor.cxx
@@ -0,0 +1,105 @@
+/* -*- 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/.
+ *
+ */
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include <svgdocumenthandler.hxx>
+#include <svgrectnode.hxx>
+#include <svgsvgnode.hxx>
+#include <svggnode.hxx>
+#include <svgpathnode.hxx>
+
+#include <svgvisitor.hxx>
+
+namespace svgio
+{
+namespace svgreader
+{
+SvgDrawVisitor::SvgDrawVisitor()
+    : mpDrawRoot(std::make_shared<DrawRoot>())
+    , mpCurrent(mpDrawRoot)
+{
+}
+
+void SvgDrawVisitor::visit(svgio::svgreader::SvgNode const& rNode)
+{
+    switch (rNode.getType())
+    {
+        case svgio::svgreader::SVGTokenSvg:
+        {
+            auto const& rSvgNode = static_cast<svgio::svgreader::SvgSvgNode const&>(rNode);
+
+            double x = rSvgNode.getX().getNumber();
+            double y = rSvgNode.getY().getNumber();
+            double w = rSvgNode.getWidth().getNumber();
+            double h = rSvgNode.getHeight().getNumber();
+
+            static_cast<DrawRoot*>(mpCurrent.get())->maRectangle
+                = basegfx::B2DRange(x, y, x + w, y + h);
+        }
+        break;
+        case svgio::svgreader::SVGTokenG:
+        {
+            auto const& rGNode = static_cast<svgio::svgreader::SvgGNode const&>(rNode);
+
+            if (rGNode.getTransform() != nullptr)
+            {
+                basegfx::B2DHomMatrix rMatrix = *rGNode.getTransform();
+
+                printf("G [%f %f %f - %f %f %f - %f %f %f]\n", rMatrix.get(0, 0), rMatrix.get(0, 1),
+                       rMatrix.get(0, 2), rMatrix.get(1, 0), rMatrix.get(1, 1), rMatrix.get(1, 2),
+                       rMatrix.get(2, 0), rMatrix.get(2, 1), rMatrix.get(2, 2));
+            }
+        }
+        break;
+        case svgio::svgreader::SVGTokenRect:
+        {
+            auto const& rRectNode = static_cast<svgio::svgreader::SvgRectNode const&>(rNode);
+
+            double x = rRectNode.getX().getNumber();
+            double y = rRectNode.getY().getNumber();
+            double w = rRectNode.getWidth().getNumber();
+            double h = rRectNode.getHeight().getNumber();
+
+            auto pRectangle
+                = std::make_shared<DrawRectangle>(basegfx::B2DRange(x, y, x + w, y + h));
+            mpCurrent->maChildren.push_back(pRectangle);
+        }
+        break;
+        case svgio::svgreader::SVGTokenPath:
+        {
+            auto const& rPathNode = static_cast<svgio::svgreader::SvgPathNode const&>(rNode);
+            auto pPath = rPathNode.getPath();
+            if (pPath)
+            {
+                auto pDrawPath = std::make_shared<DrawPath>(*pPath);
+                mpCurrent->maChildren.push_back(pDrawPath);
+            }
+        }
+        break;
+
+        default:
+            break;
+    }
+    goToChildren(rNode);
+}
+
+void SvgDrawVisitor::goToChildren(svgio::svgreader::SvgNode const& rNode)
+{
+    for (auto& rChild : rNode.getChildren())
+    {
+        rChild->accept(*this);
+    }
+}
+}
+} // end of namespace svgio::svgreader
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */