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-rw-r--r--core/fpdfapi/page/ipdf_page.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/core/fpdfapi/page/ipdf_page.h b/core/fpdfapi/page/ipdf_page.h
index 7c9fce7726..9b28559a94 100644
--- a/core/fpdfapi/page/ipdf_page.h
+++ b/core/fpdfapi/page/ipdf_page.h
@@ -20,6 +20,11 @@ class CPDFXFA_Page;
// Interface implemented by both page types (CPDF_Page and CPDFXFA_Page).
class IPDF_Page : public Retainable {
public:
+ // There are actually 3 cases: a PDF page, an XFA page backed by a PDF page,
+ // and an XFA page not backed by a PDF page. AsPDFPage() will return the
+ // PDF page in either of the first two cases. AsXFAPage() is a straight
+ // downcast and is null if not either of the last two cases. Hence, both
+ // of these may return non-null on a given page.
virtual CPDF_Page* AsPDFPage() = 0;
virtual CPDFXFA_Page* AsXFAPage() = 0;