1 files changed, 10 insertions, 0 deletions
diff --git a/core/fxcrt/fx_coordinates.h b/core/fxcrt/fx_coordinates.h
index 3d09652b13..2e8c1abca3 100644
--- a/core/fxcrt/fx_coordinates.h
+++ b/core/fxcrt/fx_coordinates.h
@@ -581,6 +581,16 @@ class CFX_RTemplate {
 using CFX_Rect = CFX_RTemplate<int32_t>;
 using CFX_RectF = CFX_RTemplate<float>;
 
+#ifndef NDEBUG
+template <class BaseType>
+std::ostream& operator<<(std::ostream& os,
+                         const CFX_RTemplate<BaseType>& rect) {
+  os << "rect[w " << rect.Width() << " x h " << rect.Height() << " (left "
+     << rect.left << ", top " << rect.top << ")]";
+  return os;
+}
+#endif  // NDEBUG
+
 // The matrix is of the form:
 // | a  b  0 |
 // | c  d  0 |