Add FPDFDest_GetLocationInPage API

Add an API to get the value of the /XYZ destination parameter.

This CL was originally from https://codereview.chromium.org/1960193003/ by
halcanary@.

Review-Url: https://codereview.chromium.org/2481743004

1 files changed, 60 insertions, 0 deletions

diff --git a/core/fpdfdoc/cpdf_dest_unittest.cpp b/core/fpdfdoc/cpdf_dest_unittest.cpp
new file mode 100644
index 0000000000..d427ab66a0
--- /dev/null
+++ b/core/fpdfdoc/cpdf_dest_unittest.cpp
@@ -0,0 +1,60 @@
+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "core/fpdfapi/parser/cpdf_array.h"
+#include "core/fpdfapi/parser/cpdf_null.h"
+#include "core/fpdfapi/parser/cpdf_number.h"
+#include "core/fpdfdoc/cpdf_dest.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "testing/test_support.h"
+#include "third_party/base/ptr_util.h"
+
+TEST(cpdf_dest, GetXYZ) {
+  bool hasX;
+  bool hasY;
+  bool hasZoom;
+  float x;
+  float y;
+  float zoom;
+
+  auto dest = pdfium::MakeUnique<CPDF_Dest>();
+  EXPECT_FALSE(dest->GetXYZ(&hasX, &hasY, &hasZoom, &x, &y, &zoom));
+
+  auto array = pdfium::MakeUnique<CPDF_Array>();
+  array->AddInteger(0);  // Page Index.
+  array->AddName("XYZ");
+  array->AddNumber(4);  // X
+
+  // Not enough entries.
+  dest = pdfium::MakeUnique<CPDF_Dest>(array.get());
+  EXPECT_FALSE(dest->GetXYZ(&hasX, &hasY, &hasZoom, &x, &y, &zoom));
+
+  array->AddNumber(5);  // Y
+  array->AddNumber(6);  // Zoom.
+
+  dest = pdfium::MakeUnique<CPDF_Dest>(array.get());
+  EXPECT_TRUE(dest->GetXYZ(&hasX, &hasY, &hasZoom, &x, &y, &zoom));
+  EXPECT_TRUE(hasX);
+  EXPECT_TRUE(hasY);
+  EXPECT_TRUE(hasZoom);
+  EXPECT_EQ(4, x);
+  EXPECT_EQ(5, y);
+  EXPECT_EQ(6, zoom);
+
+  // Set zoom to 0.
+  array->SetAt(4, new CPDF_Number(0));
+  dest = pdfium::MakeUnique<CPDF_Dest>(array.get());
+  EXPECT_TRUE(dest->GetXYZ(&hasX, &hasY, &hasZoom, &x, &y, &zoom));
+  EXPECT_FALSE(hasZoom);
+
+  // Set values to null.
+  array->SetAt(2, new CPDF_Null);
+  array->SetAt(3, new CPDF_Null);
+  array->SetAt(4, new CPDF_Null);
+  dest = pdfium::MakeUnique<CPDF_Dest>(array.get());
+  EXPECT_TRUE(dest->GetXYZ(&hasX, &hasY, &hasZoom, &x, &y, &zoom));
+  EXPECT_FALSE(hasX);
+  EXPECT_FALSE(hasY);
+  EXPECT_FALSE(hasZoom);
+}