/* -*- 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