C++ AutoTArray::AppendElement方法代码示例

// The text that should be displayed for this counter.
void
nsCounterUseNode::GetText(nsString& aResult)
{
  aResult.Truncate();

  AutoTArray<nsCounterNode*, 8> stack;
  stack.AppendElement(static_cast<nsCounterNode*>(this));

  if (mAllCounters && mScopeStart) {
    for (nsCounterNode* n = mScopeStart; n->mScopePrev; n = n->mScopeStart) {
      stack.AppendElement(n->mScopePrev);
    }
  }

  WritingMode wm = mPseudoFrame ?
    mPseudoFrame->GetWritingMode() : WritingMode();
  for (uint32_t i = stack.Length() - 1;; --i) {
    nsCounterNode* n = stack[i];
    nsAutoString text;
    bool isTextRTL;
    mCounterStyle->GetCounterText(n->mValueAfter, wm, text, isTextRTL);
    aResult.Append(text);
    if (i == 0) {
      break;
    }
    aResult.Append(mSeparator);
  }
}

void
HTMLOptionsCollection::GetSupportedNames(nsTArray<nsString>& aNames)
{
  AutoTArray<nsIAtom*, 8> atoms;
  for (uint32_t i = 0; i < mElements.Length(); ++i) {
    HTMLOptionElement* content = mElements.ElementAt(i);
    if (content) {
      // Note: HasName means the names is exposed on the document,
      // which is false for options, so we don't check it here.
      const nsAttrValue* val = content->GetParsedAttr(nsGkAtoms::name);
      if (val && val->Type() == nsAttrValue::eAtom) {
        nsIAtom* name = val->GetAtomValue();
        if (!atoms.Contains(name)) {
          atoms.AppendElement(name);
        }
      }
      if (content->HasID()) {
        nsIAtom* id = content->GetID();
        if (!atoms.Contains(id)) {
          atoms.AppendElement(id);
        }
      }
    }
  }

  uint32_t atomsLen = atoms.Length();
  nsString* names = aNames.AppendElements(atomsLen);
  for (uint32_t i = 0; i < atomsLen; ++i) {
    atoms[i]->ToString(names[i]);
  }
}

/* static */ void
nsFontFaceUtils::MarkDirtyForFontChange(nsIFrame* aSubtreeRoot,
                                        const gfxUserFontEntry* aFont)
{
  AutoTArray<nsIFrame*, 4> subtrees;
  subtrees.AppendElement(aSubtreeRoot);

  nsIPresShell* ps = aSubtreeRoot->PresContext()->PresShell();

  // check descendants, iterating over subtrees that may include
  // additional subtrees associated with placeholders
  do {
    nsIFrame* subtreeRoot = subtrees.ElementAt(subtrees.Length() - 1);
    subtrees.RemoveElementAt(subtrees.Length() - 1);

    // Check all descendants to see if they use the font
    AutoTArray<nsIFrame*, 32> stack;
    stack.AppendElement(subtreeRoot);

    do {
      nsIFrame* f = stack.ElementAt(stack.Length() - 1);
      stack.RemoveElementAt(stack.Length() - 1);

      // if this frame uses the font, mark its descendants dirty
      // and skip checking its children
      if (FrameUsesFont(f, aFont)) {
        ScheduleReflow(ps, f);
      } else {
        if (f->GetType() == nsGkAtoms::placeholderFrame) {
          nsIFrame* oof = nsPlaceholderFrame::GetRealFrameForPlaceholder(f);
          if (!nsLayoutUtils::IsProperAncestorFrame(subtreeRoot, oof)) {
            // We have another distinct subtree we need to mark.
            subtrees.AppendElement(oof);
          }
        }

        nsIFrame::ChildListIterator lists(f);
        for (; !lists.IsDone(); lists.Next()) {
          nsFrameList::Enumerator childFrames(lists.CurrentList());
          for (; !childFrames.AtEnd(); childFrames.Next()) {
            nsIFrame* kid = childFrames.get();
            stack.AppendElement(kid);
          }
        }
      }
    } while (!stack.IsEmpty());
  } while (!subtrees.IsEmpty());
}

void
nsIGlobalObject::ForEachEventTargetObject(const std::function<void(DOMEventTargetHelper*, bool* aDoneOut)>& aFunc) const
{
  // Protect against the function call triggering a mutation of the list
  // while we are iterating by copying the DETH references to a temporary
  // list.
  AutoTArray<RefPtr<DOMEventTargetHelper>, 64> targetList;
  for (const DOMEventTargetHelper* deth = mEventTargetObjects.getFirst();
       deth; deth = deth->getNext()) {
    targetList.AppendElement(const_cast<DOMEventTargetHelper*>(deth));
  }

  // Iterate the target list and call the function on each one.
  bool done = false;
  for (auto target : targetList) {
    // Check to see if a previous iteration's callback triggered the removal
    // of this target as a side-effect.  If it did, then just ignore it.
    if (target->GetOwnerGlobal() != this) {
      continue;
    }
    aFunc(target, &done);
    if (done) {
      break;
    }
  }
}

bool
nsDOMTokenList::Toggle(const nsAString& aToken,
                       const Optional<bool>& aForce,
                       ErrorResult& aError)
{
  aError = CheckToken(aToken);
  if (aError.Failed()) {
    return false;
  }

  const nsAttrValue* attr = GetParsedAttr();
  const bool forceOn = aForce.WasPassed() && aForce.Value();
  const bool forceOff = aForce.WasPassed() && !aForce.Value();

  bool isPresent = attr && attr->Contains(aToken);
  AutoTArray<nsString, 1> tokens;
  (*tokens.AppendElement()).Rebind(aToken.Data(), aToken.Length());

  if (isPresent) {
    if (!forceOn) {
      RemoveInternal(attr, tokens);
      isPresent = false;
    }
  } else {
    if (!forceOff) {
      AddInternal(attr, tokens);
      isPresent = true;
    }
  }

  return isPresent;
}

void
nsDOMTokenList::Remove(const nsAString& aToken, mozilla::ErrorResult& aError)
{
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Remove(tokens, aError);
}

void
nsDOMTokenList::Add(const nsAString& aToken, ErrorResult& aError)
{
  AutoTArray<nsString, 1> tokens;
  tokens.AppendElement(aToken);
  Add(tokens, aError);
}

already_AddRefed<Layer>
ImageBitmapRenderingContext::GetCanvasLayer(nsDisplayListBuilder* aBuilder,
                                            Layer* aOldLayer,
                                            LayerManager* aManager)
{
  if (!mImage) {
    // No DidTransactionCallback will be received, so mark the context clean
    // now so future invalidations will be dispatched.
    MarkContextClean();
    return nullptr;
  }

  RefPtr<ImageLayer> imageLayer;

  if (aOldLayer) {
    imageLayer = static_cast<ImageLayer*>(aOldLayer);
  } else {
    imageLayer = aManager->CreateImageLayer();
  }

  RefPtr<ImageContainer> imageContainer = imageLayer->GetContainer();
  if (!imageContainer) {
    imageContainer = aManager->CreateImageContainer();
    imageLayer->SetContainer(imageContainer);
  }

  AutoTArray<ImageContainer::NonOwningImage, 1> imageList;
  RefPtr<layers::Image> image = ClipToIntrinsicSize();
  imageList.AppendElement(ImageContainer::NonOwningImage(image));
  imageContainer->SetCurrentImages(imageList);

  return imageLayer.forget();
}

void
ImageContainer::SetCurrentImageInTransaction(Image *aImage)
{
  AutoTArray<NonOwningImage,1> images;
  images.AppendElement(NonOwningImage(aImage));
  SetCurrentImagesInTransaction(images);
}

void
ContentClientRemoteBuffer::Updated(const nsIntRegion& aRegionToDraw,
                                   const nsIntRegion& aVisibleRegion,
                                   bool aDidSelfCopy)
{
  nsIntRegion updatedRegion = GetUpdatedRegion(aRegionToDraw,
                                               aVisibleRegion,
                                               aDidSelfCopy);

  MOZ_ASSERT(mTextureClient);
  if (mTextureClientOnWhite) {
    mForwarder->UseComponentAlphaTextures(this, mTextureClient,
                                          mTextureClientOnWhite);
  } else {
    AutoTArray<CompositableForwarder::TimedTextureClient,1> textures;
    CompositableForwarder::TimedTextureClient* t = textures.AppendElement();
    t->mTextureClient = mTextureClient;
    IntSize size = mTextureClient->GetSize();
    t->mPictureRect = nsIntRect(0, 0, size.width, size.height);
    GetForwarder()->UseTextures(this, textures);
  }
  mForwarder->UpdateTextureRegion(this,
                                  ThebesBufferData(BufferRect(),
                                                   BufferRotation()),
                                  updatedRegion);
}

Reverb::Reverb(ThreadSharedFloatArrayBufferList* impulseResponse, size_t impulseResponseBufferLength, size_t maxFFTSize, bool useBackgroundThreads, bool normalize, float sampleRate)
{
    float scale = 1;

    AutoTArray<const float*,4> irChannels;
    for (size_t i = 0; i < impulseResponse->GetChannels(); ++i) {
        irChannels.AppendElement(impulseResponse->GetData(i));
    }
    AutoTArray<float,1024> tempBuf;

    if (normalize) {
        scale = calculateNormalizationScale(impulseResponse, impulseResponseBufferLength, sampleRate);

        if (scale) {
            tempBuf.SetLength(irChannels.Length()*impulseResponseBufferLength);
            for (uint32_t i = 0; i < irChannels.Length(); ++i) {
                float* buf = &tempBuf[i*impulseResponseBufferLength];
                AudioBufferCopyWithScale(irChannels[i], scale, buf,
                                         impulseResponseBufferLength);
                irChannels[i] = buf;
            }
        }
    }

    initialize(irChannels, impulseResponseBufferLength,
               maxFFTSize, useBackgroundThreads);
}

bool 
MsgMapiListContext::DeleteMessage(nsMsgKey key)
{
  if (!m_db)
    return FALSE;
  
  if ( !IsIMAPHost() )
  {
    return NS_SUCCEEDED((m_db->DeleteMessages(1, &key, nullptr)));
  }
#if 0 
  else if ( m_folder->GetIMAPFolderInfoMail() )
  {
    AutoTArray<nsMsgKey, 1> messageKeys;
    messageKeys.AppendElement(key);

    (m_folder->GetIMAPFolderInfoMail())->DeleteSpecifiedMessages(pane, messageKeys, nsMsgKey_None);
    m_db->DeleteMessage(key, nullptr, FALSE);
    return TRUE;
  }
#endif
  else
  {
    return FALSE;
  }
}

void
nsShmImage::Put(const mozilla::LayoutDeviceIntRegion& aRegion)
{
  AutoTArray<xcb_rectangle_t, 32> xrects;
  xrects.SetCapacity(aRegion.GetNumRects());

  for (auto iter = aRegion.RectIter(); !iter.Done(); iter.Next()) {
    const mozilla::LayoutDeviceIntRect &r = iter.Get();
    xcb_rectangle_t xrect = { (short)r.x, (short)r.y, (unsigned short)r.width, (unsigned short)r.height };
    xrects.AppendElement(xrect);
  }

  if (!mGC) {
    mGC = xcb_generate_id(mConnection);
    xcb_create_gc(mConnection, mGC, mWindow, 0, nullptr);
  }

  xcb_set_clip_rectangles(mConnection, XCB_CLIP_ORDERING_YX_BANDED, mGC, 0, 0,
                          xrects.Length(), xrects.Elements());

  if (mPixmap != XCB_NONE) {
    mLastRequest = xcb_copy_area_checked(mConnection, mPixmap, mWindow, mGC,
                                         0, 0, 0, 0, mSize.width, mSize.height);
  } else {
    mLastRequest = xcb_shm_put_image_checked(mConnection, mWindow, mGC,
                                             mSize.width, mSize.height,
                                             0, 0, mSize.width, mSize.height,
                                             0, 0, mDepth,
                                             XCB_IMAGE_FORMAT_Z_PIXMAP, 0,
                                             mShmSeg, 0);
  }

  xcb_flush(mConnection);
}

void
VideoSink::RenderVideoFrames(int32_t aMaxFrames,
                             int64_t aClockTime,
                             const TimeStamp& aClockTimeStamp)
{
  AssertOwnerThread();

  AutoTArray<RefPtr<MediaData>,16> frames;
  VideoQueue().GetFirstElements(aMaxFrames, &frames);
  if (frames.IsEmpty() || !mContainer) {
    return;
  }

  AutoTArray<ImageContainer::NonOwningImage,16> images;
  TimeStamp lastFrameTime;
  MediaSink::PlaybackParams params = mAudioSink->GetPlaybackParams();
  for (uint32_t i = 0; i < frames.Length(); ++i) {
    VideoData* frame = frames[i]->As<VideoData>();

    frame->mSentToCompositor = true;

    if (!frame->mImage || !frame->mImage->IsValid() ||
        !frame->mImage->GetSize().width || !frame->mImage->GetSize().height) {
      continue;
    }

    int64_t frameTime = frame->mTime;
    if (frameTime < 0) {
      // Frame times before the start time are invalid; drop such frames
      continue;
    }

    TimeStamp t;
    if (aMaxFrames > 1) {
      MOZ_ASSERT(!aClockTimeStamp.IsNull());
      int64_t delta = frame->mTime - aClockTime;
      t = aClockTimeStamp +
          TimeDuration::FromMicroseconds(delta / params.mPlaybackRate);
      if (!lastFrameTime.IsNull() && t <= lastFrameTime) {
        // Timestamps out of order; drop the new frame. In theory we should
        // probably replace the previous frame with the new frame if the
        // timestamps are equal, but this is a corrupt video file already so
        // never mind.
        continue;
      }
      lastFrameTime = t;
    }

    ImageContainer::NonOwningImage* img = images.AppendElement();
    img->mTimeStamp = t;
    img->mImage = frame->mImage;
    img->mFrameID = frame->mFrameID;
    img->mProducerID = mProducerID;

    VSINK_LOG_V("playing video frame %lld (id=%x) (vq-queued=%i)",
                frame->mTime, frame->mFrameID, VideoQueue().GetSize());
  }
  mContainer->SetCurrentFrames(frames[0]->As<VideoData>()->mDisplay, images);
}

void
AudioNodeStream::ObtainInputBlock(AudioBlock& aTmpChunk,
                                  uint32_t aPortIndex)
{
  uint32_t inputCount = mInputs.Length();
  uint32_t outputChannelCount = 1;
  AutoTArray<const AudioBlock*,250> inputChunks;
  for (uint32_t i = 0; i < inputCount; ++i) {
    if (aPortIndex != mInputs[i]->InputNumber()) {
      // This input is connected to a different port
      continue;
    }
    MediaStream* s = mInputs[i]->GetSource();
    AudioNodeStream* a = static_cast<AudioNodeStream*>(s);
    MOZ_ASSERT(a == s->AsAudioNodeStream());
    if (a->IsAudioParamStream()) {
      continue;
    }

    const AudioBlock* chunk = &a->mLastChunks[mInputs[i]->OutputNumber()];
    MOZ_ASSERT(chunk);
    if (chunk->IsNull() || chunk->mChannelData.IsEmpty()) {
      continue;
    }

    inputChunks.AppendElement(chunk);
    outputChannelCount =
      GetAudioChannelsSuperset(outputChannelCount, chunk->ChannelCount());
  }

  outputChannelCount = ComputedNumberOfChannels(outputChannelCount);

  uint32_t inputChunkCount = inputChunks.Length();
  if (inputChunkCount == 0 ||
      (inputChunkCount == 1 && inputChunks[0]->ChannelCount() == 0)) {
    aTmpChunk.SetNull(WEBAUDIO_BLOCK_SIZE);
    return;
  }

  if (inputChunkCount == 1 &&
      inputChunks[0]->ChannelCount() == outputChannelCount) {
    aTmpChunk = *inputChunks[0];
    return;
  }

  if (outputChannelCount == 0) {
    aTmpChunk.SetNull(WEBAUDIO_BLOCK_SIZE);
    return;
  }

  aTmpChunk.AllocateChannels(outputChannelCount);
  DownmixBufferType downmixBuffer;
  ASSERT_ALIGNED16(downmixBuffer.Elements());

  for (uint32_t i = 0; i < inputChunkCount; ++i) {
    AccumulateInputChunk(i, *inputChunks[i], &aTmpChunk, &downmixBuffer);
  }
}