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-rw-r--r--widget/windows/WindowsEMF.cpp94
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