Source/WebCore/bindings/js/JSPaintRenderingContext2DCustom.cpp

/*
 * Copyright (C) 2018 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. ``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
 * 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.
 */

#include "config.h"
#include "JSPaintRenderingContext2D.h"

#if ENABLE(CSS_PAINTING_API)

namespace WebCore {
using namespace JSC;

inline void* root(CustomPaintCanvas* canvas)
{
    return canvas;
}

bool JSPaintRenderingContext2DOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor, const char** reason)
{
    if (UNLIKELY(reason))
        *reason = "Canvas is opaque root";

    JSPaintRenderingContext2D* jsPaintRenderingContext = jsCast<JSPaintRenderingContext2D*>(handle.slot()->asCell());
    void* root = WebCore::root(&jsPaintRenderingContext->wrapped().canvas());
    return visitor.containsOpaqueRoot(root);
}

void JSPaintRenderingContext2D::visitAdditionalChildren(SlotVisitor& visitor)
{
    visitor.addOpaqueRoot(root(&wrapped().canvas()));
}

} // namespace WebCore
#endif