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-rw-r--r--gfx/2d/AutoHelpersWin.h86
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diff --git a/gfx/2d/AutoHelpersWin.h b/gfx/2d/AutoHelpersWin.h
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+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+* 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/. */
+
+#ifndef mozilla_gfx_AutoHelpersWin_h
+#define mozilla_gfx_AutoHelpersWin_h
+
+#include <windows.h>
+
+namespace mozilla {
+namespace gfx {
+
+// Get the global device context, and auto-release it on destruction.
+class AutoDC
+{
+public:
+ AutoDC() {
+ mDC = ::GetDC(nullptr);
+ }
+
+ ~AutoDC() {
+ ::ReleaseDC(nullptr, mDC);
+ }
+
+ HDC GetDC() {
+ return mDC;
+ }
+
+private:
+ HDC mDC;
+};
+
+// Select a font into the given DC, and auto-restore.
+class AutoSelectFont
+{
+public:
+ AutoSelectFont(HDC aDC, LOGFONTW *aLogFont)
+ : mOwnsFont(false)
+ {
+ mFont = ::CreateFontIndirectW(aLogFont);
+ if (mFont) {
+ mOwnsFont = true;
+ mDC = aDC;
+ mOldFont = (HFONT)::SelectObject(aDC, mFont);
+ } else {
+ mOldFont = nullptr;
+ }
+ }
+
+ AutoSelectFont(HDC aDC, HFONT aFont)
+ : mOwnsFont(false)
+ {
+ mDC = aDC;
+ mFont = aFont;
+ mOldFont = (HFONT)::SelectObject(aDC, aFont);
+ }
+
+ ~AutoSelectFont() {
+ if (mOldFont) {
+ ::SelectObject(mDC, mOldFont);
+ if (mOwnsFont) {
+ ::DeleteObject(mFont);
+ }
+ }
+ }
+
+ bool IsValid() const {
+ return mFont != nullptr;
+ }
+
+ HFONT GetFont() const {
+ return mFont;
+ }
+
+private:
+ HDC mDC;
+ HFONT mFont;
+ HFONT mOldFont;
+ bool mOwnsFont;
+};
+
+} // gfx
+} // mozilla
+
+#endif // mozilla_gfx_AutoHelpersWin_h