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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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_
#include "third_party/blink/renderer/platform/graphics/graphics_context.h"
#include "third_party/blink/renderer/platform/platform_export.h"
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"
namespace blink {
class PLATFORM_EXPORT GraphicsContextStateSaver final {
STACK_ALLOCATED();
public:
GraphicsContextStateSaver(GraphicsContext& context,
bool save_and_restore = true)
: context_(context), save_and_restore_(save_and_restore) {
if (save_and_restore_) {
context_.Save();
}
}
GraphicsContextStateSaver(const GraphicsContextStateSaver&) = delete;
GraphicsContextStateSaver& operator=(const GraphicsContextStateSaver&) =
delete;
~GraphicsContextStateSaver() {
if (save_and_restore_) {
context_.Restore();
}
}
void Save() {
DCHECK(!save_and_restore_);
context_.Save();
save_and_restore_ = true;
}
void SaveIfNeeded() {
if (Saved())
return;
Save();
}
void Restore() {
DCHECK(save_and_restore_);
context_.Restore();
save_and_restore_ = false;
}
GraphicsContext& Context() const { return context_; }
bool Saved() const { return save_and_restore_; }
private:
GraphicsContext& context_;
bool save_and_restore_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_GRAPHICS_GRAPHICS_CONTEXT_STATE_SAVER_H_
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