Fix gfx unit-tests so they do not crash on Windows, prior to Windows 7

Also fix failing Font test.
TEST=unit tests
BUG=46733
Review URL: http://codereview.chromium.org/3615001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@61725 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 63 insertions, 0 deletions

diff --git a/gfx/win_util.cc b/gfx/win_util.cc
new file mode 100644
index 0000000..edd1a01
--- /dev/null
+++ b/gfx/win_util.cc
@@ -0,0 +1,63 @@
+// Copyright (c) 2010 The Chromium 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 "gfx/win_util.h"
+
+#include <windows.h>
+
+#include "base/win_util.h"
+
+namespace {
+
+bool DynamicLibraryPresent(const wchar_t* lib_name) {
+  HINSTANCE lib = LoadLibrary(lib_name);
+  if (lib) {
+    FreeLibrary(lib);
+    return true;
+  }
+  return false;
+}
+
+}  // namespace
+
+namespace gfx {
+
+// Returns true if Direct2d is available, false otherwise.
+bool Direct2dIsAvailable() {
+  static bool checked = false;
+  static bool available = false;
+
+  if (!checked) {
+    win_util::WinVersion version = win_util::GetWinVersion();
+    if (version < win_util::WINVERSION_VISTA)
+      available = false;
+    else if (version >= win_util::WINVERSION_WIN7)
+      available = true;
+    else
+      available = DynamicLibraryPresent(L"d2d1.dll");
+    checked = true;
+  }
+  return available;
+}
+
+// Returns true if DirectWrite is available, false otherwise.
+bool DirectWriteIsAvailable() {
+  static bool checked = false;
+  static bool available = false;
+
+  if (!checked) {
+    win_util::WinVersion version = win_util::GetWinVersion();
+    if (version < win_util::WINVERSION_VISTA)
+      available = false;
+    else if (version >= win_util::WINVERSION_WIN7)
+      available = true;
+    else
+      available = DynamicLibraryPresent(L"dwrite.dll");
+    checked = true;
+  }
+  return available;
+}
+
+}  // namespace gfx
+