common shape: fix memory access violation

asan report:

../src/lib/tvgShapeImpl.h:94:15: runtime error: null pointer passed as argument 2, which is declared to never be null
../src/lib/tvgShapeImpl.h:101:15: runtime error: null pointer passed as argument 2, which is declared to never be null

diff --git a/src/lib/tvgShapeImpl.h b/src/lib/tvgShapeImpl.h
index c887f04..32aa00a 100644 (file)
--- a/src/lib/tvgShapeImpl.h
+++ b/src/lib/tvgShapeImpl.h
@@ -84,6 +84,8 @@ struct ShapePath
 
     void duplicate(const ShapePath* src)
     {
+        if (src->cmdCnt == 0 || src->ptsCnt == 0) return;
+
         cmdCnt = src->cmdCnt;
         reservedCmdCnt = src->reservedCmdCnt;
         ptsCnt = src->ptsCnt;