forked from mirrors/gecko-dev
96911bd5d2
With the help of these new function, we can serialize/deserialize EMF content in/out a share memory object. MozReview-Commit-ID: Dm45xEXmMqS --HG-- extra : rebase_source : a84834075aa58099104ba9cdaa375da4b973c23b extra : source : 61f81b148f8b1d1569d7cf279575b38f4570171f
122 lines
No EOL
2.3 KiB
C++
122 lines
No EOL
2.3 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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#include "WindowsEMF.h"
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namespace mozilla {
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namespace widget {
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WindowsEMF::WindowsEMF()
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: mEmf(nullptr)
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, mDC(nullptr)
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{
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}
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WindowsEMF::~WindowsEMF()
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{
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ReleaseAllResource();
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}
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bool
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WindowsEMF::InitForDrawing(const wchar_t* aMetafilePath /* = nullptr */)
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{
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ReleaseAllResource();
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mDC = ::CreateEnhMetaFile(nullptr, aMetafilePath, nullptr, nullptr);
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return !!mDC;
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}
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bool
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WindowsEMF::InitFromFileContents(const wchar_t* aMetafilePath)
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{
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MOZ_ASSERT(aMetafilePath);
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ReleaseAllResource();
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mEmf = ::GetEnhMetaFileW(aMetafilePath);
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return !!mEmf;
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}
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bool
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WindowsEMF::InitFromFileContents(LPBYTE aBytes, UINT aSize)
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{
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MOZ_ASSERT(aBytes && aSize != 0);
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ReleaseAllResource();
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mEmf = SetEnhMetaFileBits(aSize, aBytes);
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return !!mEmf;
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}
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bool
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WindowsEMF::FinishDocument()
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{
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if (mDC) {
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mEmf = ::CloseEnhMetaFile(mDC);
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mDC = nullptr;
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}
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return !!mEmf;
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}
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void
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WindowsEMF::ReleaseEMFHandle()
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{
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if (mEmf) {
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::DeleteEnhMetaFile(mEmf);
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mEmf = nullptr;
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}
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}
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void
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WindowsEMF::ReleaseAllResource()
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{
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FinishDocument();
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ReleaseEMFHandle();
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}
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bool
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WindowsEMF::Playback(HDC aDeviceContext, const RECT& aRect)
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{
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DebugOnly<bool> result = FinishDocument();
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MOZ_ASSERT(result, "This function should be used after InitXXX.");
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return ::PlayEnhMetaFile(aDeviceContext, mEmf, &aRect) != 0;
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}
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bool
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WindowsEMF::SaveToFile()
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{
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DebugOnly<bool> result = FinishDocument();
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MOZ_ASSERT(result, "This function should be used after InitXXX.");
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ReleaseEMFHandle();
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return true;
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}
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UINT
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WindowsEMF::GetEMFContentSize()
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{
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DebugOnly<bool> result = FinishDocument();
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MOZ_ASSERT(result, "This function should be used after InitXXX.");
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return GetEnhMetaFileBits(mEmf, 0, NULL);
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}
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bool
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WindowsEMF::GetEMFContentBits(LPBYTE aBytes)
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{
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DebugOnly<bool> result = FinishDocument();
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MOZ_ASSERT(result, "This function should be used after InitXXX.");
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UINT emfSize = GetEMFContentSize();
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if (GetEnhMetaFileBits(mEmf, emfSize, aBytes) != emfSize) {
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return false;
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}
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return true;
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}
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} // namespace widget
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} // namespace mozilla
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