From 631c1e565168b28f4566cd892ff1311754b65a87 Mon Sep 17 00:00:00 2001
From: JunsuChoi <jsuya.choi@samsung.com>
Date: Mon, 15 Mar 2021 14:56:36 +0900
Subject: [PATCH] loader SvgSceneBuilder: Add root node to clipping viewBox.

If the boundary of scene created through the scenebuilder is larger than the viewbox,
scene(SVG's root) should be clipped to the size of the viewbox.
So, if scene need a clip, add a parent root and add clippath composition to that root.
---
 src/loaders/svg/tvgSvgSceneBuilder.cpp | 28 +++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/loaders/svg/tvgSvgSceneBuilder.cpp b/src/loaders/svg/tvgSvgSceneBuilder.cpp
index 38b3b6ee..0bbc0233 100644
--- a/src/loaders/svg/tvgSvgSceneBuilder.cpp
+++ b/src/loaders/svg/tvgSvgSceneBuilder.cpp
@@ -386,6 +386,32 @@ unique_ptr<Scene> _sceneBuildHelper(const SvgNode* node, float vx, float vy, flo
     return nullptr;
 }
 
+unique_ptr<Scene> _buildRoot(const SvgNode* node, float vx, float vy, float vw, float vh)
+{
+    unique_ptr<Scene> root;
+    auto docNode = move(_sceneBuildHelper(node, vx, vy, vw, vh));
+    float x, y, w, h;
+
+    if (docNode->bounds(&x, &y, &w, &h) != Result::Success) return nullptr;
+
+    if (x < vx || y < vy || w > vh || h > vh) {
+        auto viewBoxClip = Shape::gen();
+        viewBoxClip->appendRect(vx, vy ,vw, vh, 0, 0);
+        viewBoxClip->fill(0, 0, 0, 255);
+
+        auto compositeLayer = Scene::gen();
+        compositeLayer->composite(move(viewBoxClip), tvg::CompositeMethod::ClipPath);
+        compositeLayer->push(move(docNode));
+
+        root = Scene::gen();
+        root->push(move(compositeLayer));
+    }
+    else
+    {
+        root = move(docNode);
+    }
+    return root;
+}
 
 SvgSceneBuilder::SvgSceneBuilder()
 {
@@ -401,5 +427,5 @@ unique_ptr<Scene> SvgSceneBuilder::build(SvgNode* node)
 {
     if (!node || (node->type != SvgNodeType::Doc)) return nullptr;
 
-    return _sceneBuildHelper(node, node->node.doc.vx, node->node.doc.vy, node->node.doc.vw, node->node.doc.vh);
+    return _buildRoot(node, node->node.doc.vx, node->node.doc.vy, node->node.doc.vw, node->node.doc.vh);
 }