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-rw-r--r--layout/svg/nsSVGOuterSVGFrame.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/layout/svg/nsSVGOuterSVGFrame.cpp b/layout/svg/nsSVGOuterSVGFrame.cpp
index e1b97bb40..434676010 100644
--- a/layout/svg/nsSVGOuterSVGFrame.cpp
+++ b/layout/svg/nsSVGOuterSVGFrame.cpp
@@ -1006,6 +1006,9 @@ nsSVGOuterSVGAnonChildFrame::IsSVGTransformed(Matrix* aOwnTransform,
if (ownMatrix.HasNonTranslation()) {
// Note: viewBox, currentScale and currentTranslate should only
// produce a rectilinear transform.
+ MOZ_ASSERT(ownMatrix.IsRectilinear(),
+ "Non-rectilinear transform will break the following logic");
+
// The nsDisplayTransform code will apply this transform to our frame,
// including to our frame position. We don't want our frame position to
// be scaled though, so we need to correct for that in the transform.