Add FPDFDest_GetLocationInPage API

core/fpdfdoc/cpdf_dest.cpp

Index: core/fpdfdoc/cpdf_dest.cpp
diff --git a/core/fpdfdoc/cpdf_dest.cpp b/core/fpdfdoc/cpdf_dest.cpp
index 312ef8734634167cf53f55b978549b692f27c1fc..44fe2b18f601ac951437dfdc543e4856b7e46ebf 100644
--- a/core/fpdfdoc/cpdf_dest.cpp
+++ b/core/fpdfdoc/cpdf_dest.cpp
@@ -8,6 +8,8 @@
 
 #include "core/fpdfapi/parser/cpdf_array.h"
 #include "core/fpdfapi/parser/cpdf_document.h"
+#include "core/fpdfapi/parser/cpdf_name.h"
+#include "core/fpdfapi/parser/cpdf_number.h"
 
 namespace {
 
@@ -64,6 +66,59 @@ int CPDF_Dest::GetZoomMode() {
   return 0;
 }
 
+bool CPDF_Dest::HasXYZ() const {
+  CPDF_Array* pArray = ToArray(m_pObj);
+  if (!pArray)
+    return false;
+
+  if (pArray->GetCount() < 5)
+    return false;
+
+  const CPDF_Name* xyz = ToName(pArray->GetDirectObjectAt(1));
+  if (!xyz || xyz->GetString() != "XYZ")
+    return false;
+  return true;
+}
+
+void CPDF_Dest::GetXYZ(bool* hasX,
+                       bool* hasY,
+                       bool* hasZoom,
+                       float* x,
+                       float* y,
+                       float* zoom) const {
+  ASSERT(HasXYZ());
+
+  CPDF_Array* pArray = ToArray(m_pObj);
+  if (!pArray) {
+    *hasX = false;
+    *hasY = false;
+    *hasZoom = false;
+    return;
+  }
+
+  const CPDF_Number* numX = ToNumber(pArray->GetDirectObjectAt(2));
+  const CPDF_Number* numY = ToNumber(pArray->GetDirectObjectAt(3));
+  const CPDF_Number* numZoom = ToNumber(pArray->GetDirectObjectAt(4));
+
+  // If the value is a CPDF_Null then ToNumber will return nullptr.
+  *hasX = !!numX;
+  *hasY = !!numY;
+  *hasZoom = !!numZoom;
+
+  if (numX)
+    *x = numX->GetNumber();
+  if (numY)
+    *y = numY->GetNumber();
+
+  // A zoom value of 0 is equivalent to a null value, so treat it as a null.
+  if (numZoom) {
+    if (numZoom->GetNumber() == 0.0)

[Lei Zhang, 2016/11/07 20:27:16]

Call GetNumber() just once?

[dsinclair, 2016/11/07 21:49:18]

Done.

+      *hasZoom = false;
+    else
+      *zoom = numZoom->GetNumber();
+  }
+}
+
 FX_FLOAT CPDF_Dest::GetParam(int index) {
   CPDF_Array* pArray = ToArray(m_pObj);
   return pArray ? pArray->GetNumberAt(2 + index) : 0;