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loader/svg: Check whether href id of use is parent or not

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When finding the 'nodeFrom' referenced by `<use>`,
if it is the parent, it is not referenced.

https://www.w3.org/TR/SVG2/struct.html#UseElement
Specification:
If the referenced element is a (shadow-including) ancestor
of the ‘use’ element, then this is an invalid circular reference
and the ‘use’ element is in error.

related issue: https://github.com/thorvg/thorvg/issues/2078
SVG_FILE_65171.svg
SVG_FILE_65172.svg
This commit is contained in:
JunsuChoi 2024-03-21 20:22:55 +09:00 • committed by Hermet Park
parent 46448a1520
commit fdebb15dcb
1 changed files with 26 additions and 5 deletions
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21
src/loaders/svg/tvgSvgLoader.cpp
View file

@ -1919,6 +1919,19 @@ static SvgNode* _findNodeById(SvgNode *node, const char* id)
}
static SvgNode* _findParentById(SvgNode* node, char* id, SvgNode* doc)
{
SvgNode *parent = node->parent;
while (parent != nullptr && parent != doc) {
if (parent->id && !strcmp(parent->id, id)) {
return parent;
}
parent = parent->parent;
}
return nullptr;
}
static constexpr struct
{
const char* tag;
@ -1959,8 +1972,12 @@ static bool _attrParseUseNode(void* data, const char* key, const char* value)
defs = _getDefsNode(node);
nodeFrom = _findNodeById(defs, id);
if (nodeFrom) {
if (!_findParentById(node, id, loader->doc)) {
_cloneNode(nodeFrom, node, 0);
if (nodeFrom->type == SvgNodeType::Symbol) use->symbol = nodeFrom;
} else {
TVGLOG("SVG", "%s is ancestor element. This reference is invalid.", id);
}
free(id);
} else {
//some svg export software include <defs> element at the end of the file
@ -3024,10 +3041,14 @@ static void _clonePostponedNodes(Array<SvgNodeIdPair>* cloneNodes, SvgNode* doc)
auto defs = _getDefsNode(nodeIdPair.node);
auto nodeFrom = _findNodeById(defs, nodeIdPair.id);
if (!nodeFrom) nodeFrom = _findNodeById(doc, nodeIdPair.id);
if (!_findParentById(nodeIdPair.node, nodeIdPair.id, doc)) {
_cloneNode(nodeFrom, nodeIdPair.node, 0);
if (nodeFrom && nodeFrom->type == SvgNodeType::Symbol && nodeIdPair.node->type == SvgNodeType::Use) {
nodeIdPair.node->node.use.symbol = nodeFrom;
}
} else {
TVGLOG("SVG", "%s is ancestor element. This reference is invalid.", nodeIdPair.id);
}
free(nodeIdPair.id);
}
}