87 lines
1.5 KiB
C++
87 lines
1.5 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_gfx_AutoHelpersWin_h
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#define mozilla_gfx_AutoHelpersWin_h
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#include <windows.h>
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namespace mozilla {
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namespace gfx {
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// Get the global device context, and auto-release it on destruction.
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class AutoDC
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{
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public:
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AutoDC() {
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mDC = ::GetDC(nullptr);
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}
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~AutoDC() {
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::ReleaseDC(nullptr, mDC);
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}
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HDC GetDC() {
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return mDC;
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}
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private:
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HDC mDC;
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};
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// Select a font into the given DC, and auto-restore.
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class AutoSelectFont
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{
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public:
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AutoSelectFont(HDC aDC, LOGFONTW *aLogFont)
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: mOwnsFont(false)
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{
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mFont = ::CreateFontIndirectW(aLogFont);
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if (mFont) {
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mOwnsFont = true;
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mDC = aDC;
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mOldFont = (HFONT)::SelectObject(aDC, mFont);
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} else {
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mOldFont = nullptr;
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}
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}
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AutoSelectFont(HDC aDC, HFONT aFont)
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: mOwnsFont(false)
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{
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mDC = aDC;
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mFont = aFont;
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mOldFont = (HFONT)::SelectObject(aDC, aFont);
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}
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~AutoSelectFont() {
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if (mOldFont) {
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::SelectObject(mDC, mOldFont);
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if (mOwnsFont) {
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::DeleteObject(mFont);
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}
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}
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}
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bool IsValid() const {
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return mFont != nullptr;
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}
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HFONT GetFont() const {
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return mFont;
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}
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private:
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HDC mDC;
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HFONT mFont;
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HFONT mOldFont;
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bool mOwnsFont;
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};
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} // gfx
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} // mozilla
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#endif // mozilla_gfx_AutoHelpersWin_h
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