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// Copyright (C) 2013 Google Inc. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef GraphicsContextStateSaver_h
#define GraphicsContextStateSaver_h
#include "platform/PlatformExport.h"
#include "platform/graphics/GraphicsContext.h"
#include "wtf/Allocator.h"
#include "wtf/Noncopyable.h"
namespace blink {
class PLATFORM_EXPORT GraphicsContextStateSaver final {
USING_FAST_MALLOC(GraphicsContextStateSaver);
WTF_MAKE_NONCOPYABLE(GraphicsContextStateSaver);
public:
GraphicsContextStateSaver(GraphicsContext& context,
bool saveAndRestore = true)
: m_context(context), m_saveAndRestore(saveAndRestore) {
if (m_saveAndRestore)
m_context.save();
}
~GraphicsContextStateSaver() {
if (m_saveAndRestore)
m_context.restore();
}
void save() {
ASSERT(!m_saveAndRestore);
m_context.save();
m_saveAndRestore = true;
}
void saveIfNeeded() {
if (saved())
return;
save();
}
void restore() {
ASSERT(m_saveAndRestore);
m_context.restore();
m_saveAndRestore = false;
}
GraphicsContext& context() const { return m_context; }
bool saved() const { return m_saveAndRestore; }
private:
GraphicsContext& m_context;
bool m_saveAndRestore;
};
} // namespace blink
#endif // GraphicsContextStateSaver_h
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