1 files changed, 94 insertions, 0 deletions
diff --git a/widget/windows/WindowsEMF.cpp b/widget/windows/WindowsEMF.cpp
new file mode 100644
index 0000000000..71e3631bea
--- /dev/null
+++ b/widget/windows/WindowsEMF.cpp
@@ -0,0 +1,94 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WindowsEMF.h"
+
+namespace mozilla {
+namespace widget {
+
+WindowsEMF::WindowsEMF() : mEmf(nullptr), mDC(nullptr) {}
+
+WindowsEMF::~WindowsEMF() { ReleaseAllResource(); }
+
+bool WindowsEMF::InitForDrawing(const wchar_t* aMetafilePath /* = nullptr */) {
+  ReleaseAllResource();
+
+  mDC = ::CreateEnhMetaFile(nullptr, aMetafilePath, nullptr, nullptr);
+  return !!mDC;
+}
+
+bool WindowsEMF::InitFromFileContents(const wchar_t* aMetafilePath) {
+  MOZ_ASSERT(aMetafilePath);
+  ReleaseAllResource();
+
+  mEmf = ::GetEnhMetaFileW(aMetafilePath);
+  return !!mEmf;
+}
+
+bool WindowsEMF::InitFromFileContents(LPBYTE aBytes, UINT aSize) {
+  MOZ_ASSERT(aBytes && aSize != 0);
+  ReleaseAllResource();
+
+  mEmf = SetEnhMetaFileBits(aSize, aBytes);
+
+  return !!mEmf;
+}
+
+bool WindowsEMF::FinishDocument() {
+  if (mDC) {
+    mEmf = ::CloseEnhMetaFile(mDC);
+    mDC = nullptr;
+  }
+  return !!mEmf;
+}
+
+void WindowsEMF::ReleaseEMFHandle() {
+  if (mEmf) {
+    ::DeleteEnhMetaFile(mEmf);
+    mEmf = nullptr;
+  }
+}
+
+void WindowsEMF::ReleaseAllResource() {
+  FinishDocument();
+  ReleaseEMFHandle();
+}
+
+bool WindowsEMF::Playback(HDC aDeviceContext, const RECT& aRect) {
+  DebugOnly<bool> result = FinishDocument();
+  MOZ_ASSERT(result, "This function should be used after InitXXX.");
+
+  return ::PlayEnhMetaFile(aDeviceContext, mEmf, &aRect) != 0;
+}
+
+bool WindowsEMF::SaveToFile() {
+  DebugOnly<bool> result = FinishDocument();
+  MOZ_ASSERT(result, "This function should be used after InitXXX.");
+
+  ReleaseEMFHandle();
+  return true;
+}
+
+UINT WindowsEMF::GetEMFContentSize() {
+  DebugOnly<bool> result = FinishDocument();
+  MOZ_ASSERT(result, "This function should be used after InitXXX.");
+
+  return GetEnhMetaFileBits(mEmf, 0, NULL);
+}
+
+bool WindowsEMF::GetEMFContentBits(LPBYTE aBytes) {
+  DebugOnly<bool> result = FinishDocument();
+  MOZ_ASSERT(result, "This function should be used after InitXXX.");
+
+  UINT emfSize = GetEMFContentSize();
+  if (GetEnhMetaFileBits(mEmf, emfSize, aBytes) != emfSize) {
+    return false;
+  }
+
+  return true;
+}
+
+}  // namespace widget
+}  // namespace mozilla