/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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;
};
}
// namespace gfx
}
// namespace mozilla
#endif // mozilla_gfx_AutoHelpersWin_h
