C++ AutoTArray::SetCapacity方法代码示例

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);
}

already_AddRefed<Promise>
Cache::AddAll(const GlobalObject& aGlobal,
              nsTArray<RefPtr<Request>>&& aRequestList,
              CallerType aCallerType, ErrorResult& aRv)
{
  MOZ_DIAGNOSTIC_ASSERT(mActor);

  // If there is no work to do, then resolve immediately
  if (aRequestList.IsEmpty()) {
    RefPtr<Promise> promise = Promise::Create(mGlobal, aRv);
    if (NS_WARN_IF(!promise)) {
      return nullptr;
    }

    promise->MaybeResolveWithUndefined();
    return promise.forget();
  }

  AutoTArray<RefPtr<Promise>, 256> fetchList;
  fetchList.SetCapacity(aRequestList.Length());

  // Begin fetching each request in parallel.  For now, if an error occurs just
  // abandon our previous fetch calls.  In theory we could cancel them in the
  // future once fetch supports it.

  for (uint32_t i = 0; i < aRequestList.Length(); ++i) {
    RequestOrUSVString requestOrString;
    requestOrString.SetAsRequest() = aRequestList[i];
    RefPtr<Promise> fetch = FetchRequest(mGlobal, requestOrString,
                                         RequestInit(), aCallerType, aRv);
    if (NS_WARN_IF(aRv.Failed())) {
      return nullptr;
    }

    fetchList.AppendElement(std::move(fetch));
  }

  RefPtr<Promise> promise = Promise::Create(mGlobal, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }

  RefPtr<FetchHandler> handler =
    new FetchHandler(mActor->GetWorkerHolder(), this,
                     std::move(aRequestList), promise);

  RefPtr<Promise> fetchPromise = Promise::All(aGlobal.Context(), fetchList, aRv);
  if (NS_WARN_IF(aRv.Failed())) {
    return nullptr;
  }
  fetchPromise->AppendNativeHandler(handler);

  return promise.forget();
}

void CacheOpChild::HandleRequestList(
    const nsTArray<CacheRequest>& aRequestList) {
  AutoTArray<RefPtr<Request>, 256> requests;
  requests.SetCapacity(aRequestList.Length());

  for (uint32_t i = 0; i < aRequestList.Length(); ++i) {
    AddWorkerHolderToStreamChild(aRequestList[i], GetWorkerHolder());
    requests.AppendElement(ToRequest(aRequestList[i]));
  }

  mPromise->MaybeResolve(requests);
}

void
CacheOpChild::HandleResponseList(const nsTArray<CacheResponse>& aResponseList)
{
  AutoTArray<RefPtr<Response>, 256> responses;
  responses.SetCapacity(aResponseList.Length());

  for (uint32_t i = 0; i < aResponseList.Length(); ++i) {
    AddFeatureToStreamChild(aResponseList[i], GetFeature());
    responses.AppendElement(ToResponse(aResponseList[i]));
  }

  mPromise->MaybeResolve(responses);
}

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) {
    mPutRequest = xcb_copy_area_checked(mConnection, mPixmap, mWindow, mGC,
                                        0, 0, 0, 0, mSize.width, mSize.height);
  } else {
    mPutRequest = 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);
  }

  // Send a request that returns a response so that we don't have to start a
  // sync in nsShmImage::CreateDrawTarget to retrieve the result of mPutRequest.
  mSyncRequest = xcb_get_input_focus(mConnection);
  mRequestPending = true;

  xcb_flush(mConnection);
}

void nsRegion::SimplifyOutwardByArea(uint32_t aThreshold)
{

  pixman_box32_t *boxes;
  int n;
  boxes = pixman_region32_rectangles(&mImpl, &n);

  // if we have no rectangles then we're done
  if (!n)
    return;

  pixman_box32_t *end = boxes + n;
  pixman_box32_t *topRectsEnd = boxes+1;
  pixman_box32_t *topRects = boxes;

  // we need some temporary storage for merging both rows of rectangles
  AutoTArray<pixman_box32_t, 10> tmpStorage;
  tmpStorage.SetCapacity(n);
  pixman_box32_t *tmpRect = tmpStorage.Elements();

  pixman_box32_t *destRect = boxes;
  pixman_box32_t *rect = tmpRect;
  // find the end of the first span of rectangles
  while (topRectsEnd < end && topRectsEnd->y1 == topRects->y1) {
    topRectsEnd++;
  }

  // if we only have one row we are done
  if (topRectsEnd == end)
    return;

  pixman_box32_t *bottomRects = topRectsEnd;
  pixman_box32_t *bottomRectsEnd = bottomRects+1;
  do {
    // find the end of the bottom span of rectangles
    while (bottomRectsEnd < end && bottomRectsEnd->y1 == bottomRects->y1) {
      bottomRectsEnd++;
    }
    uint32_t totalArea = ComputeMergedAreaIncrease(topRects, topRectsEnd,
                                                   bottomRects, bottomRectsEnd);

    if (totalArea <= aThreshold) {
      // merge the rects into tmpRect
      rect = MergeRects(topRects, topRectsEnd, bottomRects, bottomRectsEnd, tmpRect);

      // set topRects to where the newly merged rects will be so that we use them
      // as our next set of topRects
      topRects = destRect;
      // copy the merged rects back into the destination
      topRectsEnd = CopyRow(destRect, tmpRect, rect);
    } else {
      // copy the unmerged rects
      destRect = CopyRow(destRect, topRects, topRectsEnd);

      topRects = bottomRects;
      topRectsEnd = bottomRectsEnd;
      if (bottomRectsEnd == end) {
        // copy the last row when we are done
        topRectsEnd = CopyRow(destRect, topRects, topRectsEnd);
      }
    }
    bottomRects = bottomRectsEnd;
  } while (bottomRectsEnd != end);


  uint32_t reducedCount = topRectsEnd - pixman_region32_rectangles(&this->mImpl, &n);
  // pixman has a special representation for
  // regions of 1 rectangle. So just use the
  // bounds in that case
  if (reducedCount > 1) {
    // reach into pixman and lower the number
    // of rects stored in data.
    this->mImpl.data->numRects = reducedCount;
  } else {
    *this = GetBounds();
  }
}

/* virtual */ void
nsRubyBaseContainerFrame::Reflow(nsPresContext* aPresContext,
                                 nsHTMLReflowMetrics& aDesiredSize,
                                 const nsHTMLReflowState& aReflowState,
                                 nsReflowStatus& aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsRubyBaseContainerFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
  aStatus = NS_FRAME_COMPLETE;

  if (!aReflowState.mLineLayout) {
    NS_ASSERTION(
      aReflowState.mLineLayout,
      "No line layout provided to RubyBaseContainerFrame reflow method.");
    return;
  }

  MoveOverflowToChildList();
  // Ask text containers to drain overflows
  AutoRubyTextContainerArray textContainers(this);
  const uint32_t rtcCount = textContainers.Length();
  for (uint32_t i = 0; i < rtcCount; i++) {
    textContainers[i]->MoveOverflowToChildList();
  }

  WritingMode lineWM = aReflowState.mLineLayout->GetWritingMode();
  LogicalSize availSize(lineWM, aReflowState.AvailableISize(),
                        aReflowState.AvailableBSize());

  // We have a reflow state and a line layout for each RTC.
  // They are conceptually the state of the RTCs, but we don't actually
  // reflow those RTCs in this code. These two arrays are holders of
  // the reflow states and line layouts.
  // Since there are pointers refer to reflow states and line layouts,
  // it is necessary to guarantee that they won't be moved. For this
  // reason, they are wrapped in UniquePtr here.
  AutoTArray<UniquePtr<nsHTMLReflowState>, RTC_ARRAY_SIZE> reflowStates;
  AutoTArray<UniquePtr<nsLineLayout>, RTC_ARRAY_SIZE> lineLayouts;
  reflowStates.SetCapacity(rtcCount);
  lineLayouts.SetCapacity(rtcCount);

  // Begin the line layout for each ruby text container in advance.
  bool hasSpan = false;
  for (uint32_t i = 0; i < rtcCount; i++) {
    nsRubyTextContainerFrame* textContainer = textContainers[i];
    if (textContainer->IsSpanContainer()) {
      hasSpan = true;
    }

    nsHTMLReflowState* reflowState = new nsHTMLReflowState(
      aPresContext, *aReflowState.mParentReflowState, textContainer,
      availSize.ConvertTo(textContainer->GetWritingMode(), lineWM));
    reflowStates.AppendElement(reflowState);
    nsLineLayout* lineLayout = new nsLineLayout(aPresContext,
                                                reflowState->mFloatManager,
                                                reflowState, nullptr,
                                                aReflowState.mLineLayout);
    lineLayout->SetSuppressLineWrap(true);
    lineLayouts.AppendElement(lineLayout);

    // Line number is useless for ruby text
    // XXX nullptr here may cause problem, see comments for
    //     nsLineLayout::mBlockRS and nsLineLayout::AddFloat
    lineLayout->Init(nullptr, reflowState->CalcLineHeight(), -1);
    reflowState->mLineLayout = lineLayout;

    // Border and padding are suppressed on ruby text containers.
    // If the writing mode is vertical-rl, the horizontal position of
    // rt frames will be updated when reflowing this text container,
    // hence leave container size 0 here for now.
    lineLayout->BeginLineReflow(0, 0, reflowState->ComputedISize(),
                                NS_UNCONSTRAINEDSIZE,
                                false, false, lineWM, nsSize(0, 0));
    lineLayout->AttachRootFrameToBaseLineLayout();
  }

  aReflowState.mLineLayout->BeginSpan(this, &aReflowState,
                                      0, aReflowState.AvailableISize(),
                                      &mBaseline);

  bool allowInitialLineBreak, allowLineBreak;
  GetIsLineBreakAllowed(this, aReflowState.mLineLayout->LineIsBreakable(),
                        &allowInitialLineBreak, &allowLineBreak);

  nscoord isize = 0;
  // Reflow columns excluding any span
  ReflowState reflowState = {
    allowInitialLineBreak, allowLineBreak && !hasSpan,
    textContainers, aReflowState, reflowStates
  };
  isize = ReflowColumns(reflowState, aStatus);
  DebugOnly<nscoord> lineSpanSize = aReflowState.mLineLayout->EndSpan(this);
  aDesiredSize.ISize(lineWM) = isize;
  // When there are no frames inside the ruby base container, EndSpan
  // will return 0. However, in this case, the actual width of the
  // container could be non-zero because of non-empty ruby annotations.
  // XXX When bug 765861 gets fixed, this warning should be upgraded.
  NS_WARN_IF_FALSE(NS_INLINE_IS_BREAK(aStatus) ||
                   isize == lineSpanSize || mFrames.IsEmpty(), "bad isize");
//.........这里部分代码省略.........