Source code

Revision control

Other Tools

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* 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::InitFromFileContents(LPBYTE aBytes, UINT aSize) {
MOZ_ASSERT(aBytes && aSize != 0);
ReleaseAllResource();
mEmf = SetEnhMetaFileBits(aSize, aBytes);
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) {
DebugOnly<bool> result = FinishDocument();
MOZ_ASSERT(result, "This function should be used after InitXXX.");
return ::PlayEnhMetaFile(aDeviceContext, mEmf, &aRect) != 0;
}
bool WindowsEMF::SaveToFile() {
DebugOnly<bool> result = FinishDocument();
MOZ_ASSERT(result, "This function should be used after InitXXX.");
ReleaseEMFHandle();
return true;
}
UINT WindowsEMF::GetEMFContentSize() {
DebugOnly<bool> result = FinishDocument();
MOZ_ASSERT(result, "This function should be used after InitXXX.");
return GetEnhMetaFileBits(mEmf, 0, NULL);
}
bool WindowsEMF::GetEMFContentBits(LPBYTE aBytes) {
DebugOnly<bool> result = FinishDocument();
MOZ_ASSERT(result, "This function should be used after InitXXX.");
UINT emfSize = GetEMFContentSize();
if (GetEnhMetaFileBits(mEmf, emfSize, aBytes) != emfSize) {
return false;
}
return true;
}
} // namespace widget
} // namespace mozilla