gecko-dev/widget/windows/WindowsEMF.cpp

89 строки
1.5 KiB
C++

/* -*- 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/. */
#include "WindowsEMF.h"
namespace mozilla {
namespace widget {
WindowsEMF::WindowsEMF()
: mEmf(nullptr)
, mDC(nullptr)
{
}
WindowsEMF::~WindowsEMF()
{
ReleaseAllResource();
}
bool
WindowsEMF::InitForDrawing(const wchar_t* aMetafilePath /* = nullptr */)
{
ReleaseAllResource();
mDC = ::CreateEnhMetaFile(nullptr, aMetafilePath, nullptr, nullptr);
return !!mDC;
}
bool
WindowsEMF::InitFromFileContents(const wchar_t* aMetafilePath)
{
MOZ_ASSERT(aMetafilePath);
ReleaseAllResource();
mEmf = ::GetEnhMetaFileW(aMetafilePath);
return !!mEmf;
}
bool
WindowsEMF::FinishDocument()
{
if (mDC) {
mEmf = ::CloseEnhMetaFile(mDC);
mDC = nullptr;
}
return !!mEmf;
}
void
WindowsEMF::ReleaseEMFHandle()
{
if (mEmf) {
::DeleteEnhMetaFile(mEmf);
mEmf = nullptr;
}
}
void
WindowsEMF::ReleaseAllResource()
{
FinishDocument();
ReleaseEMFHandle();
}
bool
WindowsEMF::Playback(HDC aDeviceContext, const RECT& aRect)
{
if (!FinishDocument()) {
return false;
}
return ::PlayEnhMetaFile(aDeviceContext, mEmf, &aRect) != 0;
}
bool
WindowsEMF::SaveToFile()
{
if (!FinishDocument()) {
return false;
}
ReleaseEMFHandle();
return true;
}
} // namespace widget
} // namespace mozilla