layout/painting/DisplayItemClipChain.cpp
author alwu <alwu@mozilla.com>
Mon, 07 Jan 2019 19:57:48 +0000
changeset 512757 0e229bbdaae5c8fa9f83796c628a4fdf88f057ba
parent 508163 6f3709b3878117466168c40affa7bca0b60cf75b
child 522775 e0fb4657355d4d8052bff3f1e8baac265b5efef7
permissions -rw-r--r--
Bug 1513039 - part5 : log warning when autoplay is blocked. r=cpearce,karlt Wrap 'nsContentUtils::ReportToConsole()' to reduce necessary input parameters and call it when we need to log error or warning message. Show the warning when autoplay is blocked. For web audio, this restores the console messages removed in part4 and also reports the same message when the AudioContext is blocked in the constructor. Differential Revision: https://phabricator.services.mozilla.com/D14330

/* -*- 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 "DisplayItemClipChain.h"

#include "nsDisplayList.h"

namespace mozilla {

/* static */ const DisplayItemClip* DisplayItemClipChain::ClipForASR(
    const DisplayItemClipChain* aClipChain, const ActiveScrolledRoot* aASR) {
  while (aClipChain &&
         !ActiveScrolledRoot::IsAncestor(aClipChain->mASR, aASR)) {
    aClipChain = aClipChain->mParent;
  }
  return (aClipChain && aClipChain->mASR == aASR) ? &aClipChain->mClip
                                                  : nullptr;
}

bool DisplayItemClipChain::Equal(const DisplayItemClipChain* aClip1,
                                 const DisplayItemClipChain* aClip2) {
  if (aClip1 == aClip2) {
    return true;
  }

  if (!aClip1 || !aClip2) {
    return false;
  }

  bool ret = aClip1->mASR == aClip2->mASR && aClip1->mClip == aClip2->mClip &&
             Equal(aClip1->mParent, aClip2->mParent);
  // Sanity check: if two clip chains are equal they must hash to the same
  // thing too, or Bad Things (TM) will happen.
  MOZ_ASSERT(!ret || (Hash(aClip1) == Hash(aClip2)));
  return ret;
}

uint32_t DisplayItemClipChain::Hash(const DisplayItemClipChain* aClip) {
  if (!aClip) {
    return 0;
  }

  // We include the number of rounded rects in the hash but not their contents.
  // This is to keep the hash fast, because most clips will not have rounded
  // rects and including them will slow down the hash in the common case. Note
  // that the ::Equal check still checks the rounded rect contents, so in case
  // of hash collisions the clip chains can still be distinguished using that.
  uint32_t hash = HashGeneric(aClip->mASR, aClip->mClip.GetRoundedRectCount());
  if (aClip->mClip.HasClip()) {
    const nsRect& rect = aClip->mClip.GetClipRect();
    // empty rects are considered equal in DisplayItemClipChain::Equal, even
    // though they may have different x and y coordinates. So make sure they
    // hash to the same thing in those cases too.
    if (!rect.IsEmpty()) {
      hash = AddToHash(hash, rect.x, rect.y, rect.width, rect.height);
    }
  }

  return hash;
}

/* static */ nsCString DisplayItemClipChain::ToString(
    const DisplayItemClipChain* aClipChain) {
  nsAutoCString str;
  for (auto* sc = aClipChain; sc; sc = sc->mParent) {
    if (sc->mASR) {
      str.AppendPrintf("0x%p <%s> [0x%p]", sc, sc->mClip.ToString().get(),
                       sc->mASR->mScrollableFrame);
    } else {
      str.AppendPrintf("0x%p <%s> [root asr]", sc, sc->mClip.ToString().get());
    }
    if (sc->mParent) {
      str.AppendLiteral(", ");
    }
  }
  return std::move(str);
}

bool DisplayItemClipChain::HasRoundedCorners() const {
  return mClip.GetRoundedRectCount() > 0 ||
         (mParent && mParent->HasRoundedCorners());
}

}  // namespace mozilla