Add FPDFPage_SetRotation function

fpdfsdk/src/fpdfeditpage.cpp

Index: fpdfsdk/src/fpdfeditpage.cpp
diff --git a/fpdfsdk/src/fpdfeditpage.cpp b/fpdfsdk/src/fpdfeditpage.cpp
index 3f22b56b48435d94afe9b1c82f3ca528bb00d57a..4c9fd351088ebc0501a69522484a90b7f083afc3 100644
--- a/fpdfsdk/src/fpdfeditpage.cpp
+++ b/fpdfsdk/src/fpdfeditpage.cpp
@@ -314,3 +314,17 @@ DLLEXPORT void STDCALL FPDFPage_TransformAnnots(FPDF_PAGE page,
 	}
 
 }
+
+DLLEXPORT void STDCALL FPDFPage_SetRotation(FPDF_PAGE page, int rotate)
+{
+	CPDF_Page* pPage = (CPDF_Page*)page;
+	if (!pPage || !pPage->m_pFormDict || !pPage->m_pFormDict->KeyExist("Type")
+		|| pPage->m_pFormDict->GetElement("Type")->GetDirect()->GetString().Compare("Page"))
+	{
+		return;
+	}
+	CPDF_Dictionary* pDict = pPage->m_pFormDict;
+	rotate %=4;
+
+	pDict->SetAt("Rotate", FX_NEW CPDF_Number(rotate * 90));
+}