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/*
* Copyright (C) 2023 Apple 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
*/
#pragma once
#include "AffineTransform.h"
#include "IntRect.h"
#include <wtf/CheckedPtr.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace WebCore {
class Path;
class RegionContext : public CanMakeCheckedPtr<RegionContext> {
WTF_MAKE_TZONE_ALLOCATED(RegionContext);
WTF_OVERRIDE_DELETE_FOR_CHECKED_PTR(RegionContext);
public:
virtual ~RegionContext() = default;
void pushTransform(const AffineTransform&);
void popTransform();
void pushClip(const IntRect&);
void pushClip(const Path&);
void popClip();
virtual bool isEventRegionContext() const { return false; }
virtual bool isAccessibilityRegionContext() const { return false; }
protected:
Vector<AffineTransform> m_transformStack;
Vector<IntRect> m_clipStack;
}; // class RegionContext
class RegionContextStateSaver {
public:
RegionContextStateSaver(RegionContext* context)
: m_context(context)
{
}
~RegionContextStateSaver()
{
if (!m_context)
return;
if (m_pushedClip)
m_context->popClip();
}
void pushClip(const IntRect& clipRect)
{
ASSERT(!m_pushedClip);
if (m_context)
m_context->pushClip(clipRect);
m_pushedClip = true;
}
void pushClip(const Path& path)
{
ASSERT(!m_pushedClip);
if (m_context)
m_context->pushClip(path);
m_pushedClip = true;
}
RegionContext* context() const { return const_cast<RegionContext*>(m_context.get()); }
private:
CheckedPtr<RegionContext> m_context;
bool m_pushedClip { false };
}; // class RegionContextStateSaver
} // namespace WebCore
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