widget/ContentCache.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Wed, 12 Oct 2016 17:09:02 +0900
changeset 362882 97cb51652c868d8698c966ad0483f1421be1d449
parent 362881 8bea9647dc86865e874f346a3fccc14565ce3f65
child 362883 64f030acc66bae6f210b5d8a2d82e38993bde2cf
permissions -rw-r--r--
Bug 1304620 part.2 ContentCacheInParent should manage if there is pending composition in the remote process r=m_kato If the remote process is busy or user restarts composition too quickly, there could be 2 or more compositions in ContentCache. For managing such case, ContentCacheInParent should manage the pending composition count which is increased at dispatching eCompositionStart event to the remote process and decreased at receiving eCompositionCommit(AsIs) event from the remote process. MozReview-Commit-ID: KbTsK20NEZD

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* 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 "mozilla/ContentCache.h"
#include "mozilla/IMEStateManager.h"
#include "mozilla/Logging.h"
#include "mozilla/TextComposition.h"
#include "mozilla/TextEvents.h"
#include "nsIWidget.h"
#include "mozilla/RefPtr.h"
#include "mozilla/Move.h"

namespace mozilla {

using namespace widget;

static const char*
GetBoolName(bool aBool)
{
  return aBool ? "true" : "false";
}

static const char*
GetNotificationName(const IMENotification* aNotification)
{
  if (!aNotification) {
    return "Not notification";
  }
  return ToChar(aNotification->mMessage);
}

class GetRectText : public nsAutoCString
{
public:
  explicit GetRectText(const LayoutDeviceIntRect& aRect)
  {
    Assign("{ x=");
    AppendInt(aRect.x);
    Append(", y=");
    AppendInt(aRect.y);
    Append(", width=");
    AppendInt(aRect.width);
    Append(", height=");
    AppendInt(aRect.height);
    Append(" }");
  }
  virtual ~GetRectText() {}
};

class GetWritingModeName : public nsAutoCString
{
public:
  explicit GetWritingModeName(const WritingMode& aWritingMode)
  {
    if (!aWritingMode.IsVertical()) {
      Assign("Horizontal");
      return;
    }
    if (aWritingMode.IsVerticalLR()) {
      Assign("Vertical (LTR)");
      return;
    }
    Assign("Vertical (RTL)");
  }
  virtual ~GetWritingModeName() {}
};

class GetEscapedUTF8String final : public NS_ConvertUTF16toUTF8
{
public:
  explicit GetEscapedUTF8String(const nsAString& aString)
    : NS_ConvertUTF16toUTF8(aString)
  {
    Escape();
  }
  explicit GetEscapedUTF8String(const char16ptr_t aString)
    : NS_ConvertUTF16toUTF8(aString)
  {
    Escape();
  }
  GetEscapedUTF8String(const char16ptr_t aString, uint32_t aLength)
    : NS_ConvertUTF16toUTF8(aString, aLength)
  {
    Escape();
  }

private:
  void Escape()
  {
    ReplaceSubstring("\r", "\\r");
    ReplaceSubstring("\n", "\\n");
    ReplaceSubstring("\t", "\\t");
  }
};

/*****************************************************************************
 * mozilla::ContentCache
 *****************************************************************************/

LazyLogModule sContentCacheLog("ContentCacheWidgets");

ContentCache::ContentCache()
  : mCompositionStart(UINT32_MAX)
{
}

/*****************************************************************************
 * mozilla::ContentCacheInChild
 *****************************************************************************/

ContentCacheInChild::ContentCacheInChild()
  : ContentCache()
{
}

void
ContentCacheInChild::Clear()
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p Clear()", this));

  mCompositionStart = UINT32_MAX;
  mText.Truncate();
  mSelection.Clear();
  mFirstCharRect.SetEmpty();
  mCaret.Clear();
  mTextRectArray.Clear();
  mEditorRect.SetEmpty();
}

bool
ContentCacheInChild::CacheAll(nsIWidget* aWidget,
                              const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheAll(aWidget=0x%p, aNotification=%s)",
     this, aWidget, GetNotificationName(aNotification)));

  if (NS_WARN_IF(!CacheText(aWidget, aNotification)) ||
      NS_WARN_IF(!CacheEditorRect(aWidget, aNotification))) {
    return false;
  }
  return true;
}

bool
ContentCacheInChild::CacheSelection(nsIWidget* aWidget,
                                    const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheSelection(aWidget=0x%p, aNotification=%s)",
     this, aWidget, GetNotificationName(aNotification)));

  mCaret.Clear();
  mSelection.Clear();

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent selection(true, eQuerySelectedText, aWidget);
  aWidget->DispatchEvent(&selection, status);
  if (NS_WARN_IF(!selection.mSucceeded)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p CacheSelection(), FAILED, "
       "couldn't retrieve the selected text", this));
    return false;
  }
  if (selection.mReply.mReversed) {
    mSelection.mAnchor =
      selection.mReply.mOffset + selection.mReply.mString.Length();
    mSelection.mFocus = selection.mReply.mOffset;
  } else {
    mSelection.mAnchor = selection.mReply.mOffset;
    mSelection.mFocus =
      selection.mReply.mOffset + selection.mReply.mString.Length();
  }
  mSelection.mWritingMode = selection.GetWritingMode();

  return CacheCaret(aWidget, aNotification) &&
         CacheTextRects(aWidget, aNotification);
}

bool
ContentCacheInChild::CacheCaret(nsIWidget* aWidget,
                                const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheCaret(aWidget=0x%p, aNotification=%s)",
     this, aWidget, GetNotificationName(aNotification)));

  mCaret.Clear();

  if (NS_WARN_IF(!mSelection.IsValid())) {
    return false;
  }

  // XXX Should be mSelection.mFocus?
  mCaret.mOffset = mSelection.StartOffset();

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent caretRect(true, eQueryCaretRect, aWidget);
  caretRect.InitForQueryCaretRect(mCaret.mOffset);
  aWidget->DispatchEvent(&caretRect, status);
  if (NS_WARN_IF(!caretRect.mSucceeded)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p CacheCaret(), FAILED, "
       "couldn't retrieve the caret rect at offset=%u",
       this, mCaret.mOffset));
    mCaret.Clear();
    return false;
  }
  mCaret.mRect = caretRect.mReply.mRect;
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheCaret(), Succeeded, "
     "mSelection={ mAnchor=%u, mFocus=%u, mWritingMode=%s }, "
     "mCaret={ mOffset=%u, mRect=%s }",
     this, mSelection.mAnchor, mSelection.mFocus,
     GetWritingModeName(mSelection.mWritingMode).get(), mCaret.mOffset,
     GetRectText(mCaret.mRect).get()));
  return true;
}

bool
ContentCacheInChild::CacheEditorRect(nsIWidget* aWidget,
                                     const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheEditorRect(aWidget=0x%p, aNotification=%s)",
     this, aWidget, GetNotificationName(aNotification)));

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent editorRectEvent(true, eQueryEditorRect, aWidget);
  aWidget->DispatchEvent(&editorRectEvent, status);
  if (NS_WARN_IF(!editorRectEvent.mSucceeded)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p CacheEditorRect(), FAILED, "
       "couldn't retrieve the editor rect", this));
    return false;
  }
  mEditorRect = editorRectEvent.mReply.mRect;
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheEditorRect(), Succeeded, "
     "mEditorRect=%s", this, GetRectText(mEditorRect).get()));
  return true;
}

bool
ContentCacheInChild::CacheText(nsIWidget* aWidget,
                               const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheText(aWidget=0x%p, aNotification=%s)",
     this, aWidget, GetNotificationName(aNotification)));

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent queryText(true, eQueryTextContent, aWidget);
  queryText.InitForQueryTextContent(0, UINT32_MAX);
  aWidget->DispatchEvent(&queryText, status);
  if (NS_WARN_IF(!queryText.mSucceeded)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p CacheText(), FAILED, couldn't retrieve whole text", this));
    mText.Truncate();
    return false;
  }
  mText = queryText.mReply.mString;
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheText(), Succeeded, mText.Length()=%u", this, mText.Length()));

  return CacheSelection(aWidget, aNotification);
}

bool
ContentCacheInChild::QueryCharRect(nsIWidget* aWidget,
                                   uint32_t aOffset,
                                   LayoutDeviceIntRect& aCharRect) const
{
  aCharRect.SetEmpty();

  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent textRect(true, eQueryTextRect, aWidget);
  textRect.InitForQueryTextRect(aOffset, 1);
  aWidget->DispatchEvent(&textRect, status);
  if (NS_WARN_IF(!textRect.mSucceeded)) {
    return false;
  }
  aCharRect = textRect.mReply.mRect;

  // Guarantee the rect is not empty.
  if (NS_WARN_IF(!aCharRect.height)) {
    aCharRect.height = 1;
  }
  if (NS_WARN_IF(!aCharRect.width)) {
    aCharRect.width = 1;
  }
  return true;
}

bool
ContentCacheInChild::QueryCharRectArray(nsIWidget* aWidget,
                                        uint32_t aOffset,
                                        uint32_t aLength,
                                        RectArray& aCharRectArray) const
{
  nsEventStatus status = nsEventStatus_eIgnore;
  WidgetQueryContentEvent textRects(true, eQueryTextRectArray, aWidget);
  textRects.InitForQueryTextRectArray(aOffset, aLength);
  aWidget->DispatchEvent(&textRects, status);
  if (NS_WARN_IF(!textRects.mSucceeded)) {
    aCharRectArray.Clear();
    return false;
  }
  aCharRectArray = Move(textRects.mReply.mRectArray);
  return true;
}

bool
ContentCacheInChild::CacheTextRects(nsIWidget* aWidget,
                                    const IMENotification* aNotification)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheTextRects(aWidget=0x%p, aNotification=%s), "
     "mCaret={ mOffset=%u, IsValid()=%s }",
     this, aWidget, GetNotificationName(aNotification), mCaret.mOffset,
     GetBoolName(mCaret.IsValid())));

  mCompositionStart = UINT32_MAX;
  mTextRectArray.Clear();
  mSelection.ClearAnchorCharRects();
  mSelection.ClearFocusCharRects();
  mSelection.mRect.SetEmpty();
  mFirstCharRect.SetEmpty();

  if (NS_WARN_IF(!mSelection.IsValid())) {
    return false;
  }

  // Retrieve text rects in composition string if there is.
  RefPtr<TextComposition> textComposition =
    IMEStateManager::GetTextCompositionFor(aWidget);
  if (textComposition) {
    // mCompositionStart may be updated by some composition event handlers.
    // So, let's update it with the latest information.
    mCompositionStart = textComposition->NativeOffsetOfStartComposition();
    // Note that TextComposition::String() may not be modified here because
    // it's modified after all edit action listeners are performed but this
    // is called while some of them are performed.
    uint32_t length = textComposition->LastData().Length();
    mTextRectArray.mStart = mCompositionStart;
    if (NS_WARN_IF(!QueryCharRectArray(aWidget, mTextRectArray.mStart, length,
                                       mTextRectArray.mRects))) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p CacheTextRects(), FAILED, "
         "couldn't retrieve text rect array of the composition string", this));
    }
  }

  if (mTextRectArray.InRange(mSelection.mAnchor) &&
      (!mSelection.mAnchor || mTextRectArray.InRange(mSelection.mAnchor - 1))) {
    mSelection.mAnchorCharRects[eNextCharRect] =
      mTextRectArray.GetRect(mSelection.mAnchor);
    if (mSelection.mAnchor) {
      mSelection.mAnchorCharRects[ePrevCharRect] =
        mTextRectArray.GetRect(mSelection.mAnchor - 1);
    }
  } else {
    RectArray rects;
    uint32_t startOffset = mSelection.mAnchor ? mSelection.mAnchor - 1 : 0;
    uint32_t length = mSelection.mAnchor ? 2 : 1;
    if (NS_WARN_IF(!QueryCharRectArray(aWidget, startOffset, length, rects))) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p CacheTextRects(), FAILED, "
         "couldn't retrieve text rect array around the selection anchor (%u)",
         this, mSelection.mAnchor));
      MOZ_ASSERT(mSelection.mAnchorCharRects[ePrevCharRect].IsEmpty());
      MOZ_ASSERT(mSelection.mAnchorCharRects[eNextCharRect].IsEmpty());
    } else {
      if (rects.Length() > 1) {
        mSelection.mAnchorCharRects[ePrevCharRect] = rects[0];
        mSelection.mAnchorCharRects[eNextCharRect] = rects[1];
      } else if (rects.Length()) {
        mSelection.mAnchorCharRects[eNextCharRect] = rects[0];
        MOZ_ASSERT(mSelection.mAnchorCharRects[ePrevCharRect].IsEmpty());
      }
    }
  }

  if (mSelection.Collapsed()) {
    mSelection.mFocusCharRects[0] = mSelection.mAnchorCharRects[0];
    mSelection.mFocusCharRects[1] = mSelection.mAnchorCharRects[1];
  } else if (mTextRectArray.InRange(mSelection.mFocus) &&
             (!mSelection.mFocus ||
              mTextRectArray.InRange(mSelection.mFocus - 1))) {
    mSelection.mFocusCharRects[eNextCharRect] =
      mTextRectArray.GetRect(mSelection.mFocus);
    if (mSelection.mFocus) {
      mSelection.mFocusCharRects[ePrevCharRect] =
        mTextRectArray.GetRect(mSelection.mFocus - 1);
    }
  } else {
    RectArray rects;
    uint32_t startOffset = mSelection.mFocus ? mSelection.mFocus - 1 : 0;
    uint32_t length = mSelection.mFocus ? 2 : 1;
    if (NS_WARN_IF(!QueryCharRectArray(aWidget, startOffset, length, rects))) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p CacheTextRects(), FAILED, "
         "couldn't retrieve text rect array around the selection focus (%u)",
         this, mSelection.mFocus));
      MOZ_ASSERT(mSelection.mFocusCharRects[ePrevCharRect].IsEmpty());
      MOZ_ASSERT(mSelection.mFocusCharRects[eNextCharRect].IsEmpty());
    } else {
      if (rects.Length() > 1) {
        mSelection.mFocusCharRects[ePrevCharRect] = rects[0];
        mSelection.mFocusCharRects[eNextCharRect] = rects[1];
      } else if (rects.Length()) {
        mSelection.mFocusCharRects[eNextCharRect] = rects[0];
        MOZ_ASSERT(mSelection.mFocusCharRects[ePrevCharRect].IsEmpty());
      }
    }
  }

  if (!mSelection.Collapsed()) {
    nsEventStatus status = nsEventStatus_eIgnore;
    WidgetQueryContentEvent textRect(true, eQueryTextRect, aWidget);
    textRect.InitForQueryTextRect(mSelection.StartOffset(),
                                  mSelection.Length());
    aWidget->DispatchEvent(&textRect, status);
    if (NS_WARN_IF(!textRect.mSucceeded)) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p CacheTextRects(), FAILED, "
         "couldn't retrieve text rect of whole selected text", this));
    } else {
      mSelection.mRect = textRect.mReply.mRect;
    }
  }

  if (!mSelection.mFocus) {
    mFirstCharRect = mSelection.mFocusCharRects[eNextCharRect];
  } else if (mSelection.mFocus == 1) {
    mFirstCharRect = mSelection.mFocusCharRects[ePrevCharRect];
  } else if (!mSelection.mAnchor) {
    mFirstCharRect = mSelection.mAnchorCharRects[eNextCharRect];
  } else if (mSelection.mAnchor == 1) {
    mFirstCharRect = mSelection.mFocusCharRects[ePrevCharRect];
  } else if (mTextRectArray.InRange(0)) {
    mFirstCharRect = mTextRectArray.GetRect(0);
  } else {
    LayoutDeviceIntRect charRect;
    if (NS_WARN_IF(!QueryCharRect(aWidget, 0, charRect))) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p CacheTextRects(), FAILED, "
         "couldn't retrieve first char rect", this));
    } else {
      mFirstCharRect = charRect;
    }
  }

  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p CacheTextRects(), Succeeded, "
     "mText.Length()=%u, mTextRectArray={ mStart=%u, mRects.Length()=%u }, "
     "mSelection={ mAnchor=%u, mAnchorCharRects[eNextCharRect]=%s, "
     "mAnchorCharRects[ePrevCharRect]=%s, mFocus=%u, "
     "mFocusCharRects[eNextCharRect]=%s, mFocusCharRects[ePrevCharRect]=%s, "
     "mRect=%s }, mFirstCharRect=%s",
     this, mText.Length(), mTextRectArray.mStart,
     mTextRectArray.mRects.Length(), mSelection.mAnchor,
     GetRectText(mSelection.mAnchorCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mAnchorCharRects[ePrevCharRect]).get(),
     mSelection.mFocus,
     GetRectText(mSelection.mFocusCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mFocusCharRects[ePrevCharRect]).get(),
     GetRectText(mSelection.mRect).get(), GetRectText(mFirstCharRect).get()));
  return true;
}

void
ContentCacheInChild::SetSelection(nsIWidget* aWidget,
                                  uint32_t aStartOffset,
                                  uint32_t aLength,
                                  bool aReversed,
                                  const WritingMode& aWritingMode)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p SetSelection(aStartOffset=%u, "
     "aLength=%u, aReversed=%s, aWritingMode=%s), mText.Length()=%u",
     this, aStartOffset, aLength, GetBoolName(aReversed),
     GetWritingModeName(aWritingMode).get(), mText.Length()));

  if (!aReversed) {
    mSelection.mAnchor = aStartOffset;
    mSelection.mFocus = aStartOffset + aLength;
  } else {
    mSelection.mAnchor = aStartOffset + aLength;
    mSelection.mFocus = aStartOffset;
  }
  mSelection.mWritingMode = aWritingMode;

  if (NS_WARN_IF(!CacheCaret(aWidget))) {
    return;
  }
  Unused << NS_WARN_IF(!CacheTextRects(aWidget));
}

/*****************************************************************************
 * mozilla::ContentCacheInParent
 *****************************************************************************/

ContentCacheInParent::ContentCacheInParent()
  : ContentCache()
  , mCommitStringByRequest(nullptr)
  , mPendingEventsNeedingAck(0)
  , mPendingCompositionCount(0)
  , mWidgetHasComposition(false)
{
}

void
ContentCacheInParent::AssignContent(const ContentCache& aOther,
                                    nsIWidget* aWidget,
                                    const IMENotification* aNotification)
{
  mCompositionStart = aOther.mCompositionStart;
  mText = aOther.mText;
  mSelection = aOther.mSelection;
  mFirstCharRect = aOther.mFirstCharRect;
  mCaret = aOther.mCaret;
  mTextRectArray = aOther.mTextRectArray;
  mEditorRect = aOther.mEditorRect;

  if (mWidgetHasComposition) {
    NS_WARNING_ASSERTION(mCompositionStart != UINT32_MAX, "mCompositionStart");
    IMEStateManager::MaybeStartOffsetUpdatedInChild(aWidget, mCompositionStart);
  } else {
    NS_WARNING_ASSERTION(mCompositionStart == UINT32_MAX, "mCompositionStart");
  }

  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p AssignContent(aNotification=%s), "
     "Succeeded, mText.Length()=%u, mSelection={ mAnchor=%u, mFocus=%u, "
     "mWritingMode=%s, mAnchorCharRects[eNextCharRect]=%s, "
     "mAnchorCharRects[ePrevCharRect]=%s, mFocusCharRects[eNextCharRect]=%s, "
     "mFocusCharRects[ePrevCharRect]=%s, mRect=%s }, "
     "mFirstCharRect=%s, mCaret={ mOffset=%u, mRect=%s }, mTextRectArray={ "
     "mStart=%u, mRects.Length()=%u }, mWidgetHasComposition=%s, "
     "mCompositionStart=%u, mEditorRect=%s",
     this, GetNotificationName(aNotification),
     mText.Length(), mSelection.mAnchor, mSelection.mFocus,
     GetWritingModeName(mSelection.mWritingMode).get(),
     GetRectText(mSelection.mAnchorCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mAnchorCharRects[ePrevCharRect]).get(),
     GetRectText(mSelection.mFocusCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mFocusCharRects[ePrevCharRect]).get(),
     GetRectText(mSelection.mRect).get(), GetRectText(mFirstCharRect).get(),
     mCaret.mOffset, GetRectText(mCaret.mRect).get(), mTextRectArray.mStart,
     mTextRectArray.mRects.Length(), GetBoolName(mWidgetHasComposition),
     mCompositionStart, GetRectText(mEditorRect).get()));
}

bool
ContentCacheInParent::HandleQueryContentEvent(WidgetQueryContentEvent& aEvent,
                                              nsIWidget* aWidget) const
{
  MOZ_ASSERT(aWidget);

  aEvent.mSucceeded = false;
  aEvent.mReply.mFocusedWidget = aWidget;

  // ContentCache doesn't store offset of its start with XP linebreaks.
  // So, we don't support to query contents relative to composition start
  // offset with XP linebreaks.
  if (NS_WARN_IF(!aEvent.mUseNativeLineBreak)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p HandleQueryContentEvent(), FAILED due to query with XP linebreaks",
       this));
    return false;
  }

  if (NS_WARN_IF(!aEvent.mInput.IsValidOffset())) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p HandleQueryContentEvent(), FAILED due to invalid offset",
       this));
    return false;
  }

  if (NS_WARN_IF(!aEvent.mInput.IsValidEventMessage(aEvent.mMessage))) {
    MOZ_LOG(sContentCacheLog, LogLevel::Error,
      ("0x%p HandleQueryContentEvent(), FAILED due to invalid event message",
       this));
    return false;
  }

  bool isRelativeToInsertionPoint = aEvent.mInput.mRelativeToInsertionPoint;
  if (isRelativeToInsertionPoint) {
    if (aWidget->PluginHasFocus()) {
      if (NS_WARN_IF(!aEvent.mInput.MakeOffsetAbsolute(0))) {
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), FAILED due to "
           "aEvent.mInput.MakeOffsetAbsolute(0) failure, aEvent={ mMessage=%s, "
           "mInput={ mOffset=%d, mLength=%d } }",
           this, ToChar(aEvent.mMessage), aEvent.mInput.mOffset,
           aEvent.mInput.mLength));
        return false;
      }
    } else if (mWidgetHasComposition) {
      if (NS_WARN_IF(!aEvent.mInput.MakeOffsetAbsolute(mCompositionStart))) {
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), FAILED due to "
           "aEvent.mInput.MakeOffsetAbsolute(mCompositionStart) failure, "
           "mCompositionStart=%d, aEvent={ mMessage=%s, "
           "mInput={ mOffset=%d, mLength=%d } }",
           this, mCompositionStart, ToChar(aEvent.mMessage),
           aEvent.mInput.mOffset, aEvent.mInput.mLength));
        return false;
      }
    } else if (NS_WARN_IF(!mSelection.IsValid())) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p HandleQueryContentEvent(), FAILED due to mSelection is invalid",
         this));
      return false;
    } else if (NS_WARN_IF(!aEvent.mInput.MakeOffsetAbsolute(
                                           mSelection.StartOffset()))) {
      MOZ_LOG(sContentCacheLog, LogLevel::Error,
        ("0x%p HandleQueryContentEvent(), FAILED due to "
         "aEvent.mInput.MakeOffsetAbsolute(mSelection.StartOffset()) "
         "failure, mSelection={ StartOffset()=%d, Length()=%d }, "
         "aEvent={ mMessage=%s, mInput={ mOffset=%d, mLength=%d } }",
         this, mSelection.StartOffset(), mSelection.Length(),
         ToChar(aEvent.mMessage), aEvent.mInput.mOffset,
         aEvent.mInput.mLength));
      return false;
    }
  }

  switch (aEvent.mMessage) {
    case eQuerySelectedText:
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent("
         "aEvent={ mMessage=eQuerySelectedText }, aWidget=0x%p)",
         this, aWidget));
      if (aWidget->PluginHasFocus()) {
        MOZ_LOG(sContentCacheLog, LogLevel::Info,
          ("0x%p HandleQueryContentEvent(), "
           "return emtpy selection becasue plugin has focus",
           this));
        aEvent.mSucceeded = true;
        aEvent.mReply.mOffset = 0;
        aEvent.mReply.mReversed = false;
        aEvent.mReply.mHasSelection = false;
        return true;
      }
      if (NS_WARN_IF(!IsSelectionValid())) {
        // If content cache hasn't been initialized properly, make the query
        // failed.
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), "
           "FAILED because mSelection is not valid", this));
        return true;
      }
      aEvent.mReply.mOffset = mSelection.StartOffset();
      if (mSelection.Collapsed()) {
        aEvent.mReply.mString.Truncate(0);
      } else {
        if (NS_WARN_IF(mSelection.EndOffset() > mText.Length())) {
          MOZ_LOG(sContentCacheLog, LogLevel::Error,
            ("0x%p HandleQueryContentEvent(), "
             "FAILED because mSelection.EndOffset()=%u is larger than "
             "mText.Length()=%u",
             this, mSelection.EndOffset(), mText.Length()));
          return false;
        }
        aEvent.mReply.mString =
          Substring(mText, aEvent.mReply.mOffset, mSelection.Length());
      }
      aEvent.mReply.mReversed = mSelection.Reversed();
      aEvent.mReply.mHasSelection = true;
      aEvent.mReply.mWritingMode = mSelection.mWritingMode;
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent(), "
         "Succeeded, aEvent={ mReply={ mOffset=%u, mString=\"%s\", "
         "mReversed=%s, mHasSelection=%s, mWritingMode=%s } }",
         this, aEvent.mReply.mOffset,
         GetEscapedUTF8String(aEvent.mReply.mString).get(),
         GetBoolName(aEvent.mReply.mReversed),
         GetBoolName(aEvent.mReply.mHasSelection),
         GetWritingModeName(aEvent.mReply.mWritingMode).get()));
      break;
    case eQueryTextContent: {
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent("
         "aEvent={ mMessage=eQueryTextContent, mInput={ mOffset=%u, "
         "mLength=%u } }, aWidget=0x%p), mText.Length()=%u",
         this, aEvent.mInput.mOffset,
         aEvent.mInput.mLength, aWidget, mText.Length()));
      uint32_t inputOffset = aEvent.mInput.mOffset;
      uint32_t inputEndOffset =
        std::min(aEvent.mInput.EndOffset(), mText.Length());
      if (NS_WARN_IF(inputEndOffset < inputOffset)) {
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), "
           "FAILED because inputOffset=%u is larger than inputEndOffset=%u",
           this, inputOffset, inputEndOffset));
        return false;
      }
      aEvent.mReply.mOffset = inputOffset;
      aEvent.mReply.mString =
        Substring(mText, inputOffset, inputEndOffset - inputOffset);
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent(), "
         "Succeeded, aEvent={ mReply={ mOffset=%u, mString.Length()=%u } }",
         this, aEvent.mReply.mOffset, aEvent.mReply.mString.Length()));
      break;
    }
    case eQueryTextRect:
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent("
         "aEvent={ mMessage=eQueryTextRect, mInput={ mOffset=%u, "
         "mLength=%u } }, aWidget=0x%p), mText.Length()=%u",
         this, aEvent.mInput.mOffset, aEvent.mInput.mLength, aWidget,
         mText.Length()));
      if (NS_WARN_IF(!IsSelectionValid())) {
        // If content cache hasn't been initialized properly, make the query
        // failed.
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), "
           "FAILED because mSelection is not valid", this));
        return true;
      }
      // Note that if the query is relative to insertion point, the query was
      // probably requested by native IME.  In such case, we should return
      // non-empty rect since returning failure causes IME showing its window
      // at odd position.
      if (aEvent.mInput.mLength) {
        if (NS_WARN_IF(!GetUnionTextRects(aEvent.mInput.mOffset,
                                          aEvent.mInput.mLength,
                                          isRelativeToInsertionPoint,
                                          aEvent.mReply.mRect))) {
          // XXX We don't have cache for this request.
          MOZ_LOG(sContentCacheLog, LogLevel::Error,
            ("0x%p HandleQueryContentEvent(), "
             "FAILED to get union rect", this));
          return false;
        }
      } else {
        // If the length is 0, we should return caret rect instead.
        if (NS_WARN_IF(!GetCaretRect(aEvent.mInput.mOffset,
                                     isRelativeToInsertionPoint,
                                     aEvent.mReply.mRect))) {
          MOZ_LOG(sContentCacheLog, LogLevel::Error,
            ("0x%p HandleQueryContentEvent(), "
             "FAILED to get caret rect", this));
          return false;
        }
      }
      if (aEvent.mInput.mOffset < mText.Length()) {
        aEvent.mReply.mString =
          Substring(mText, aEvent.mInput.mOffset,
                    mText.Length() >= aEvent.mInput.EndOffset() ?
                      aEvent.mInput.mLength : UINT32_MAX);
      } else {
        aEvent.mReply.mString.Truncate(0);
      }
      aEvent.mReply.mOffset = aEvent.mInput.mOffset;
      // XXX This may be wrong if storing range isn't in the selection range.
      aEvent.mReply.mWritingMode = mSelection.mWritingMode;
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent(), "
         "Succeeded, aEvent={ mReply={ mOffset=%u, mString=\"%s\", "
         "mWritingMode=%s, mRect=%s } }",
         this, aEvent.mReply.mOffset,
         GetEscapedUTF8String(aEvent.mReply.mString).get(),
         GetWritingModeName(aEvent.mReply.mWritingMode).get(),
         GetRectText(aEvent.mReply.mRect).get()));
      break;
    case eQueryCaretRect:
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent("
         "aEvent={ mMessage=eQueryCaretRect, mInput={ mOffset=%u } }, "
         "aWidget=0x%p), mText.Length()=%u",
         this, aEvent.mInput.mOffset, aWidget, mText.Length()));
      if (NS_WARN_IF(!IsSelectionValid())) {
        // If content cache hasn't been initialized properly, make the query
        // failed.
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), "
           "FAILED because mSelection is not valid", this));
        return true;
      }
      // Note that if the query is relative to insertion point, the query was
      // probably requested by native IME.  In such case, we should return
      // non-empty rect since returning failure causes IME showing its window
      // at odd position.
      if (NS_WARN_IF(!GetCaretRect(aEvent.mInput.mOffset,
                                   isRelativeToInsertionPoint,
                                   aEvent.mReply.mRect))) {
        MOZ_LOG(sContentCacheLog, LogLevel::Error,
          ("0x%p HandleQueryContentEvent(), "
           "FAILED to get caret rect", this));
        return false;
      }
      aEvent.mReply.mOffset = aEvent.mInput.mOffset;
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent(), "
         "Succeeded, aEvent={ mReply={ mOffset=%u, mRect=%s } }",
         this, aEvent.mReply.mOffset, GetRectText(aEvent.mReply.mRect).get()));
      break;
    case eQueryEditorRect:
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent("
         "aEvent={ mMessage=eQueryEditorRect }, aWidget=0x%p)",
         this, aWidget));
      aEvent.mReply.mRect = mEditorRect;
      MOZ_LOG(sContentCacheLog, LogLevel::Info,
        ("0x%p HandleQueryContentEvent(), "
         "Succeeded, aEvent={ mReply={ mRect=%s } }",
         this, GetRectText(aEvent.mReply.mRect).get()));
      break;
    default:
      break;
  }
  aEvent.mSucceeded = true;
  return true;
}

bool
ContentCacheInParent::GetTextRect(uint32_t aOffset,
                                  bool aRoundToExistingOffset,
                                  LayoutDeviceIntRect& aTextRect) const
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p GetTextRect(aOffset=%u, "
     "aRoundToExistingOffset=%s), "
     "mTextRectArray={ mStart=%u, mRects.Length()=%u }, "
     "mSelection={ mAnchor=%u, mFocus=%u }",
     this, aOffset, GetBoolName(aRoundToExistingOffset),
     mTextRectArray.mStart, mTextRectArray.mRects.Length(),
     mSelection.mAnchor, mSelection.mFocus));

  if (!aOffset) {
    NS_WARNING_ASSERTION(!mFirstCharRect.IsEmpty(), "empty rect");
    aTextRect = mFirstCharRect;
    return !aTextRect.IsEmpty();
  }
  if (aOffset == mSelection.mAnchor) {
    NS_WARNING_ASSERTION(!mSelection.mAnchorCharRects[eNextCharRect].IsEmpty(),
                         "empty rect");
    aTextRect = mSelection.mAnchorCharRects[eNextCharRect];
    return !aTextRect.IsEmpty();
  }
  if (mSelection.mAnchor && aOffset == mSelection.mAnchor - 1) {
    NS_WARNING_ASSERTION(!mSelection.mAnchorCharRects[ePrevCharRect].IsEmpty(),
                         "empty rect");
    aTextRect = mSelection.mAnchorCharRects[ePrevCharRect];
    return !aTextRect.IsEmpty();
  }
  if (aOffset == mSelection.mFocus) {
    NS_WARNING_ASSERTION(!mSelection.mFocusCharRects[eNextCharRect].IsEmpty(),
                         "empty rect");
    aTextRect = mSelection.mFocusCharRects[eNextCharRect];
    return !aTextRect.IsEmpty();
  }
  if (mSelection.mFocus && aOffset == mSelection.mFocus - 1) {
    NS_WARNING_ASSERTION(!mSelection.mFocusCharRects[ePrevCharRect].IsEmpty(),
                         "empty rect");
    aTextRect = mSelection.mFocusCharRects[ePrevCharRect];
    return !aTextRect.IsEmpty();
  }

  uint32_t offset = aOffset;
  if (!mTextRectArray.InRange(aOffset)) {
    if (!aRoundToExistingOffset) {
      aTextRect.SetEmpty();
      return false;
    }
    if (!mTextRectArray.IsValid()) {
      // If there are no rects in mTextRectArray, we should refer the start of
      // the selection because IME must query a char rect around it if there is
      // no composition.
      aTextRect = mSelection.StartCharRect();
      return !aTextRect.IsEmpty();
    }
    if (offset < mTextRectArray.StartOffset()) {
      offset = mTextRectArray.StartOffset();
    } else {
      offset = mTextRectArray.EndOffset() - 1;
    }
  }
  aTextRect = mTextRectArray.GetRect(offset);
  return !aTextRect.IsEmpty();
}

bool
ContentCacheInParent::GetUnionTextRects(
                        uint32_t aOffset,
                        uint32_t aLength,
                        bool aRoundToExistingOffset,
                        LayoutDeviceIntRect& aUnionTextRect) const
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p GetUnionTextRects(aOffset=%u, "
     "aLength=%u, aRoundToExistingOffset=%s), mTextRectArray={ "
     "mStart=%u, mRects.Length()=%u }, "
     "mSelection={ mAnchor=%u, mFocus=%u }",
     this, aOffset, aLength, GetBoolName(aRoundToExistingOffset),
     mTextRectArray.mStart, mTextRectArray.mRects.Length(),
     mSelection.mAnchor, mSelection.mFocus));

  CheckedInt<uint32_t> endOffset =
    CheckedInt<uint32_t>(aOffset) + aLength;
  if (!endOffset.isValid()) {
    return false;
  }

  if (!mSelection.Collapsed() &&
      aOffset == mSelection.StartOffset() && aLength == mSelection.Length()) {
    NS_WARNING_ASSERTION(!mSelection.mRect.IsEmpty(), "empty rect");
    aUnionTextRect = mSelection.mRect;
    return !aUnionTextRect.IsEmpty();
  }

  if (aLength == 1) {
    if (!aOffset) {
      NS_WARNING_ASSERTION(!mFirstCharRect.IsEmpty(), "empty rect");
      aUnionTextRect = mFirstCharRect;
      return !aUnionTextRect.IsEmpty();
    }
    if (aOffset == mSelection.mAnchor) {
      NS_WARNING_ASSERTION(
        !mSelection.mAnchorCharRects[eNextCharRect].IsEmpty(), "empty rect");
      aUnionTextRect = mSelection.mAnchorCharRects[eNextCharRect];
      return !aUnionTextRect.IsEmpty();
    }
    if (mSelection.mAnchor && aOffset == mSelection.mAnchor - 1) {
      NS_WARNING_ASSERTION(
        !mSelection.mAnchorCharRects[ePrevCharRect].IsEmpty(), "empty rect");
      aUnionTextRect = mSelection.mAnchorCharRects[ePrevCharRect];
      return !aUnionTextRect.IsEmpty();
    }
    if (aOffset == mSelection.mFocus) {
      NS_WARNING_ASSERTION(
        !mSelection.mFocusCharRects[eNextCharRect].IsEmpty(), "empty rect");
      aUnionTextRect = mSelection.mFocusCharRects[eNextCharRect];
      return !aUnionTextRect.IsEmpty();
    }
    if (mSelection.mFocus && aOffset == mSelection.mFocus - 1) {
      NS_WARNING_ASSERTION(
        !mSelection.mFocusCharRects[ePrevCharRect].IsEmpty(), "empty rect");
      aUnionTextRect = mSelection.mFocusCharRects[ePrevCharRect];
      return !aUnionTextRect.IsEmpty();
    }
  }

  // Even if some text rects are not cached of the queried range,
  // we should return union rect when the first character's rect is cached
  // since the first character rect is important and the others are not so
  // in most cases.

  if (!aOffset && aOffset != mSelection.mAnchor &&
      aOffset != mSelection.mFocus && !mTextRectArray.InRange(aOffset)) {
    // The first character rect isn't cached.
    return false;
  }

  if ((aRoundToExistingOffset && mTextRectArray.HasRects()) ||
      mTextRectArray.IsOverlappingWith(aOffset, aLength)) {
    aUnionTextRect =
      mTextRectArray.GetUnionRectAsFarAsPossible(aOffset, aLength,
                                                 aRoundToExistingOffset);
  } else {
    aUnionTextRect.SetEmpty();
  }

  if (!aOffset) {
    aUnionTextRect = aUnionTextRect.Union(mFirstCharRect);
  }
  if (aOffset <= mSelection.mAnchor && mSelection.mAnchor < endOffset.value()) {
    aUnionTextRect =
      aUnionTextRect.Union(mSelection.mAnchorCharRects[eNextCharRect]);
  }
  if (mSelection.mAnchor && aOffset <= mSelection.mAnchor - 1 &&
      mSelection.mAnchor - 1 < endOffset.value()) {
    aUnionTextRect =
      aUnionTextRect.Union(mSelection.mAnchorCharRects[ePrevCharRect]);
  }
  if (aOffset <= mSelection.mFocus && mSelection.mFocus < endOffset.value()) {
    aUnionTextRect =
      aUnionTextRect.Union(mSelection.mFocusCharRects[eNextCharRect]);
  }
  if (mSelection.mFocus && aOffset <= mSelection.mFocus - 1 &&
      mSelection.mFocus - 1 < endOffset.value()) {
    aUnionTextRect =
      aUnionTextRect.Union(mSelection.mFocusCharRects[ePrevCharRect]);
  }

  return !aUnionTextRect.IsEmpty();
}

bool
ContentCacheInParent::GetCaretRect(uint32_t aOffset,
                                   bool aRoundToExistingOffset,
                                   LayoutDeviceIntRect& aCaretRect) const
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p GetCaretRect(aOffset=%u, "
     "aRoundToExistingOffset=%s), "
     "mCaret={ mOffset=%u, mRect=%s, IsValid()=%s }, mTextRectArray={ "
     "mStart=%u, mRects.Length()=%u }, mSelection={ mAnchor=%u, mFocus=%u, "
     "mWritingMode=%s, mAnchorCharRects[eNextCharRect]=%s, "
     "mAnchorCharRects[ePrevCharRect]=%s, mFocusCharRects[eNextCharRect]=%s, "
     "mFocusCharRects[ePrevCharRect]=%s }, mFirstCharRect=%s",
     this, aOffset, GetBoolName(aRoundToExistingOffset),
     mCaret.mOffset, GetRectText(mCaret.mRect).get(),
     GetBoolName(mCaret.IsValid()), mTextRectArray.mStart,
     mTextRectArray.mRects.Length(), mSelection.mAnchor, mSelection.mFocus,
     GetWritingModeName(mSelection.mWritingMode).get(),
     GetRectText(mSelection.mAnchorCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mAnchorCharRects[ePrevCharRect]).get(),
     GetRectText(mSelection.mFocusCharRects[eNextCharRect]).get(),
     GetRectText(mSelection.mFocusCharRects[ePrevCharRect]).get(),
     GetRectText(mFirstCharRect).get()));

  if (mCaret.IsValid() && mCaret.mOffset == aOffset) {
    aCaretRect = mCaret.mRect;
    return true;
  }

  // Guess caret rect from the text rect if it's stored.
  if (!GetTextRect(aOffset, aRoundToExistingOffset, aCaretRect)) {
    // There might be previous character rect in the cache.  If so, we can
    // guess the caret rect with it.
    if (!aOffset ||
        !GetTextRect(aOffset - 1, aRoundToExistingOffset, aCaretRect)) {
      aCaretRect.SetEmpty();
      return false;
    }

    if (mSelection.mWritingMode.IsVertical()) {
      aCaretRect.y = aCaretRect.YMost();
    } else {
      // XXX bidi-unaware.
      aCaretRect.x = aCaretRect.XMost();
    }
  }

  // XXX This is not bidi aware because we don't cache each character's
  //     direction.  However, this is usually used by IME, so, assuming the
  //     character is in LRT context must not cause any problem.
  if (mSelection.mWritingMode.IsVertical()) {
    aCaretRect.height = mCaret.IsValid() ? mCaret.mRect.height : 1;
  } else {
    aCaretRect.width = mCaret.IsValid() ? mCaret.mRect.width : 1;
  }
  return true;
}

bool
ContentCacheInParent::OnCompositionEvent(const WidgetCompositionEvent& aEvent)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p OnCompositionEvent(aEvent={ "
     "mMessage=%s, mData=\"%s\" (Length()=%u), mRanges->Length()=%u }), "
     "mPendingEventsNeedingAck=%u, mWidgetHasComposition=%s, "
     "mPendingCompositionCount=%u, mCommitStringByRequest=0x%p",
     this, ToChar(aEvent.mMessage),
     GetEscapedUTF8String(aEvent.mData).get(), aEvent.mData.Length(),
     aEvent.mRanges ? aEvent.mRanges->Length() : 0, mPendingEventsNeedingAck,
     GetBoolName(mWidgetHasComposition), mPendingCompositionCount,
     mCommitStringByRequest));

  // We must be able to simulate the selection because
  // we might not receive selection updates in time
  if (!mWidgetHasComposition) {
    if (aEvent.mWidget && aEvent.mWidget->PluginHasFocus()) {
      // If focus is on plugin, we cannot get selection range
      mCompositionStart = 0;
    } else {
      mCompositionStart = mSelection.StartOffset();
    }
    MOZ_ASSERT(aEvent.mMessage == eCompositionStart);
    MOZ_RELEASE_ASSERT(mPendingCompositionCount < UINT8_MAX);
    mPendingCompositionCount++;
  }

  mWidgetHasComposition = !aEvent.CausesDOMCompositionEndEvent();

  if (!mWidgetHasComposition) {
    mCompositionStart = UINT32_MAX;
  }

  // During REQUEST_TO_COMMIT_COMPOSITION or REQUEST_TO_CANCEL_COMPOSITION,
  // widget usually sends a eCompositionChange and/or eCompositionCommit event
  // to finalize or clear the composition, respectively.  In this time,
  // we need to intercept all composition events here and pass the commit
  // string for returning to the remote process as a result of
  // RequestIMEToCommitComposition().  Then, eCommitComposition event will
  // be dispatched with the committed string in the remote process internally.
  if (mCommitStringByRequest) {
    MOZ_ASSERT(aEvent.mMessage == eCompositionChange ||
               aEvent.mMessage == eCompositionCommit);
    *mCommitStringByRequest = aEvent.mData;
    return false;
  }

  mPendingEventsNeedingAck++;
  return true;
}

void
ContentCacheInParent::OnSelectionEvent(
                        const WidgetSelectionEvent& aSelectionEvent)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p OnSelectionEvent(aEvent={ "
     "mMessage=%s, mOffset=%u, mLength=%u, mReversed=%s, "
     "mExpandToClusterBoundary=%s, mUseNativeLineBreak=%s }), "
     "mPendingEventsNeedingAck=%u, mWidgetHasComposition=%s, "
     "mPendingCompositionCount=%u",
     this, ToChar(aSelectionEvent.mMessage),
     aSelectionEvent.mOffset, aSelectionEvent.mLength,
     GetBoolName(aSelectionEvent.mReversed),
     GetBoolName(aSelectionEvent.mExpandToClusterBoundary),
     GetBoolName(aSelectionEvent.mUseNativeLineBreak), mPendingEventsNeedingAck,
     GetBoolName(mWidgetHasComposition), mPendingCompositionCount));

  mPendingEventsNeedingAck++;
}

void
ContentCacheInParent::OnEventNeedingAckHandled(nsIWidget* aWidget,
                                                EventMessage aMessage)
{
  // This is called when the child process receives WidgetCompositionEvent or
  // WidgetSelectionEvent.

  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p OnEventNeedingAckHandled(aWidget=0x%p, "
     "aMessage=%s), mPendingEventsNeedingAck=%u, mPendingCompositionCount=%u",
     this, aWidget, ToChar(aMessage), mPendingEventsNeedingAck));

  if (WidgetCompositionEvent::IsFollowedByCompositionEnd(aMessage)) {
    MOZ_RELEASE_ASSERT(mPendingCompositionCount > 0);
    mPendingCompositionCount--;
  }

  MOZ_RELEASE_ASSERT(mPendingEventsNeedingAck > 0);
  if (--mPendingEventsNeedingAck) {
    return;
  }

  FlushPendingNotifications(aWidget);
}

bool
ContentCacheInParent::RequestIMEToCommitComposition(nsIWidget* aWidget,
                                                    bool aCancel,
                                                    nsAString& aCommittedString)
{
  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("0x%p RequestToCommitComposition(aWidget=%p, "
     "aCancel=%s), mWidgetHasComposition=%s, mCommitStringByRequest=%p",
     this, aWidget, GetBoolName(aCancel), GetBoolName(mWidgetHasComposition),
     mCommitStringByRequest));

  MOZ_ASSERT(!mCommitStringByRequest);

  RefPtr<TextComposition> composition =
    IMEStateManager::GetTextCompositionFor(aWidget);
  if (NS_WARN_IF(!composition)) {
    MOZ_LOG(sContentCacheLog, LogLevel::Warning,
      ("  0x%p RequestToCommitComposition(), "
       "does nothing due to no composition", this));
    return false;
  }

  mCommitStringByRequest = &aCommittedString;

  aWidget->NotifyIME(IMENotification(aCancel ? REQUEST_TO_CANCEL_COMPOSITION :
                                               REQUEST_TO_COMMIT_COMPOSITION));

  mCommitStringByRequest = nullptr;

  MOZ_LOG(sContentCacheLog, LogLevel::Info,
    ("  0x%p RequestToCommitComposition(), "
     "mWidgetHasComposition=%s, the composition %s committed synchronously",
     this, GetBoolName(mWidgetHasComposition),
     composition->Destroyed() ? "WAS" : "has NOT been"));

  if (!composition->Destroyed()) {
    // When the composition isn't committed synchronously, the remote process's
    // TextComposition instance will synthesize commit events and wait to
    // receive delayed composition events.  When TextComposition instances both
    // in this process and the remote process will be destroyed when delayed
    // composition events received. TextComposition instance in the parent
    // process will dispatch following composition events and be destroyed
    // normally. On the other hand, TextComposition instance in the remote
    // process won't dispatch following composition events and will be
    // destroyed by IMEStateManager::DispatchCompositionEvent().
    return false;
  }

  // When the composition is committed synchronously, the commit string will be
  // returned to the remote process. Then, PuppetWidget will dispatch
  // eCompositionCommit event with the returned commit string (i.e., the value
  // is aCommittedString of this method).  Finally, TextComposition instance in
  // the remote process will be destroyed by
  // IMEStateManager::DispatchCompositionEvent() at receiving the
  // eCompositionCommit event (Note that TextComposition instance in this
  // process was already destroyed).
  return true;
}

void
ContentCacheInParent::MaybeNotifyIME(nsIWidget* aWidget,
                                     const IMENotification& aNotification)
{
  if (!mPendingEventsNeedingAck) {
    IMEStateManager::NotifyIME(aNotification, aWidget, true);
    return;
  }

  switch (aNotification.mMessage) {
    case NOTIFY_IME_OF_SELECTION_CHANGE:
      mPendingSelectionChange.MergeWith(aNotification);
      break;
    case NOTIFY_IME_OF_TEXT_CHANGE:
      mPendingTextChange.MergeWith(aNotification);
      break;
    case NOTIFY_IME_OF_POSITION_CHANGE:
      mPendingLayoutChange.MergeWith(aNotification);
      break;
    case NOTIFY_IME_OF_COMPOSITION_EVENT_HANDLED:
      mPendingCompositionUpdate.MergeWith(aNotification);
      break;
    default:
      MOZ_CRASH("Unsupported notification");
      break;
  }
}

void
ContentCacheInParent::FlushPendingNotifications(nsIWidget* aWidget)
{
  MOZ_ASSERT(!mPendingEventsNeedingAck);

  // New notifications which are notified during flushing pending notifications
  // should be merged again.
  mPendingEventsNeedingAck++;

  nsCOMPtr<nsIWidget> kungFuDeathGrip(aWidget);

  // First, text change notification should be sent because selection change
  // notification notifies IME of current selection range in the latest content.
  // So, IME may need the latest content before that.
  if (mPendingTextChange.HasNotification()) {
    IMENotification notification(mPendingTextChange);
    if (!aWidget->Destroyed()) {
      mPendingTextChange.Clear();
      IMEStateManager::NotifyIME(notification, aWidget, true);
    }
  }

  if (mPendingSelectionChange.HasNotification()) {
    IMENotification notification(mPendingSelectionChange);
    if (!aWidget->Destroyed()) {
      mPendingSelectionChange.Clear();
      IMEStateManager::NotifyIME(notification, aWidget, true);
    }
  }

  // Layout change notification should be notified after selection change
  // notification because IME may want to query position of new caret position.
  if (mPendingLayoutChange.HasNotification()) {
    IMENotification notification(mPendingLayoutChange);
    if (!aWidget->Destroyed()) {
      mPendingLayoutChange.Clear();
      IMEStateManager::NotifyIME(notification, aWidget, true);
    }
  }

  // Finally, send composition update notification because it notifies IME of
  // finishing handling whole sending events.
  if (mPendingCompositionUpdate.HasNotification()) {
    IMENotification notification(mPendingCompositionUpdate);
    if (!aWidget->Destroyed()) {
      mPendingCompositionUpdate.Clear();
      IMEStateManager::NotifyIME(notification, aWidget, true);
    }
  }

  if (!--mPendingEventsNeedingAck && !aWidget->Destroyed() &&
      (mPendingTextChange.HasNotification() ||
       mPendingSelectionChange.HasNotification() ||
       mPendingLayoutChange.HasNotification() ||
       mPendingCompositionUpdate.HasNotification())) {
    FlushPendingNotifications(aWidget);
  }
}

/*****************************************************************************
 * mozilla::ContentCache::TextRectArray
 *****************************************************************************/

LayoutDeviceIntRect
ContentCache::TextRectArray::GetRect(uint32_t aOffset) const
{
  LayoutDeviceIntRect rect;
  if (InRange(aOffset)) {
    rect = mRects[aOffset - mStart];
  }
  return rect;
}

LayoutDeviceIntRect
ContentCache::TextRectArray::GetUnionRect(uint32_t aOffset,
                                          uint32_t aLength) const
{
  LayoutDeviceIntRect rect;
  if (!InRange(aOffset, aLength)) {
    return rect;
  }
  for (uint32_t i = 0; i < aLength; i++) {
    rect = rect.Union(mRects[aOffset - mStart + i]);
  }
  return rect;
}

LayoutDeviceIntRect
ContentCache::TextRectArray::GetUnionRectAsFarAsPossible(
                               uint32_t aOffset,
                               uint32_t aLength,
                               bool aRoundToExistingOffset) const
{
  LayoutDeviceIntRect rect;
  if (!HasRects() ||
      (!aRoundToExistingOffset && !IsOverlappingWith(aOffset, aLength))) {
    return rect;
  }
  uint32_t startOffset = std::max(aOffset, mStart);
  if (aRoundToExistingOffset && startOffset >= EndOffset()) {
    startOffset = EndOffset() - 1;
  }
  uint32_t endOffset = std::min(aOffset + aLength, EndOffset());
  if (aRoundToExistingOffset && endOffset < mStart + 1) {
    endOffset = mStart + 1;
  }
  if (NS_WARN_IF(endOffset < startOffset)) {
    return rect;
  }
  for (uint32_t i = 0; i < endOffset - startOffset; i++) {
    rect = rect.Union(mRects[startOffset - mStart + i]);
  }
  return rect;
}

} // namespace mozilla