Source/WebCore/page/PerformanceLoggingClient.cpp

/*
 * Copyright (C) 2017 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.
 */

#include "config.h"
#include "PerformanceLoggingClient.h"

#include <wtf/text/StringBuilder.h>

namespace WebCore {

String PerformanceLoggingClient::synchronousScrollingReasonsAsString(OptionSet<SynchronousScrollingReason> synchronousScrollingReasons)
{
    if (synchronousScrollingReasons.isEmpty())
        return emptyString();

    StringBuilder reasons;

    if (synchronousScrollingReasons & SynchronousScrollingReason::ForcedOnMainThread)
        reasons.appendLiteral("forced,");
    if (synchronousScrollingReasons & SynchronousScrollingReason::HasSlowRepaintObjects)
        reasons.appendLiteral("slow-repaint objects,");
    if (synchronousScrollingReasons & SynchronousScrollingReason::HasViewportConstrainedObjectsWithoutSupportingFixedLayers)
        reasons.appendLiteral("viewport-constrained objects,");
    if (synchronousScrollingReasons & SynchronousScrollingReason::HasNonLayerViewportConstrainedObjects)
        reasons.appendLiteral("non-layer viewport-constrained objects,");
    if (synchronousScrollingReasons & SynchronousScrollingReason::IsImageDocument)
        reasons.appendLiteral("image document,");

    // Strip the trailing comma.
    return reasons.toString().left(reasons.length() - 1);
}

} // namespace WebCore