Source/WebCore/bindings/js/JSOffscreenCanvasRenderingContext2DCustom.cpp

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "config.h"

#if ENABLE(OFFSCREEN_CANVAS)

#include "JSOffscreenCanvasRenderingContext2D.h"

namespace WebCore {
using namespace JSC;

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

bool JSOffscreenCanvasRenderingContext2DOwner::isReachableFromOpaqueRoots(JSC::Handle<JSC::Unknown> handle, void*, SlotVisitor& visitor, const char** reason)
{
    if (UNLIKELY(reason))
        *reason = "Canvas is opaque root";

    JSOffscreenCanvasRenderingContext2D* jsOffscreenCanvasRenderingContext = jsCast<JSOffscreenCanvasRenderingContext2D*>(handle.slot()->asCell());
    void* root = WebCore::root(&jsOffscreenCanvasRenderingContext->wrapped().canvas());
    return visitor.containsOpaqueRoot(root);
}

void JSOffscreenCanvasRenderingContext2D::visitAdditionalChildren(SlotVisitor& visitor)
{
    visitor.addOpaqueRoot(root(&wrapped().canvas()));
}

} // namespace WebCore

#endif