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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "FrameMetrics.h"
#include "gfxPrefs.h"
#include "nsStyleConsts.h"

namespace mozilla {
namespace layers {

const FrameMetrics::ViewID FrameMetrics::NULL_SCROLL_ID = 0;

void ScrollMetadata::SetUsesContainerScrolling(bool aValue) {
  MOZ_ASSERT_IF(aValue, gfxPrefs::LayoutUseContainersForRootFrames());
  mUsesContainerScrolling = aValue;
}

static OverscrollBehavior ToOverscrollBehavior(
    StyleOverscrollBehavior aBehavior) {
  switch (aBehavior) {
    case StyleOverscrollBehavior::Auto:
      return OverscrollBehavior::Auto;
    case StyleOverscrollBehavior::Contain:
      return OverscrollBehavior::Contain;
    case StyleOverscrollBehavior::None:
      return OverscrollBehavior::None;
  }
  MOZ_ASSERT_UNREACHABLE("Invalid overscroll behavior");
  return OverscrollBehavior::Auto;
}

OverscrollBehaviorInfo OverscrollBehaviorInfo::FromStyleConstants(
    StyleOverscrollBehavior aBehaviorX, StyleOverscrollBehavior aBehaviorY) {
  OverscrollBehaviorInfo result;
  result.mBehaviorX = ToOverscrollBehavior(aBehaviorX);
  result.mBehaviorY = ToOverscrollBehavior(aBehaviorY);
  return result;
}

StaticAutoPtr<const ScrollMetadata> ScrollMetadata::sNullMetadata;

}  // namespace layers
}  // namespace mozilla