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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
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