layout/generic/nsRubyTextContainerFrame.cpp
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 488233 8e24328ba71484dd144b9d0d2fdd287a9327c1b4
child 508163 6f3709b3878117466168c40affa7bca0b60cf75b
permissions -rw-r--r--
Bug 1448426 - Wrap windows.h to avoid problematic define statements, r=froydnj,glandium By default, windows.h exposes a large number of problematic define statements which are UpperCamelCase, such as a define from `CreateWindow` to `CreateWindow{A,W}`. As many of these names are generic (e.g. CreateFile, CreateWindow), they can mess up Gecko code that may legitimately have its own methods with the same names. The header also defines some traditional SCREAMING_SNAKE_CASE defines which can mess up our code by conflicting with local values. This patch adds a simple code generator which generates wrappers for these defines, and uses them to wrap the windows.h wrapper using the `stl_wrappers` mechanism, allowing us to use windows.h in more places. Differential Revision: https://phabricator.services.mozilla.com/D10932

/* -*- 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/. */

/* rendering object for CSS "display: ruby-text-container" */

#include "nsRubyTextContainerFrame.h"

#include "mozilla/ComputedStyle.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WritingModes.h"
#include "nsLineLayout.h"
#include "nsPresContext.h"

using namespace mozilla;

//----------------------------------------------------------------------

// Frame class boilerplate
// =======================

NS_QUERYFRAME_HEAD(nsRubyTextContainerFrame)
  NS_QUERYFRAME_ENTRY(nsRubyTextContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

NS_IMPL_FRAMEARENA_HELPERS(nsRubyTextContainerFrame)

nsContainerFrame*
NS_NewRubyTextContainerFrame(nsIPresShell* aPresShell,
                             ComputedStyle* aStyle)
{
  return new (aPresShell) nsRubyTextContainerFrame(aStyle);
}


//----------------------------------------------------------------------

// nsRubyTextContainerFrame Method Implementations
// ===============================================

#ifdef DEBUG_FRAME_DUMP
nsresult
nsRubyTextContainerFrame::GetFrameName(nsAString& aResult) const
{
  return MakeFrameName(NS_LITERAL_STRING("RubyTextContainer"), aResult);
}
#endif

/* virtual */ bool
nsRubyTextContainerFrame::IsFrameOfType(uint32_t aFlags) const
{
  if (aFlags & (eSupportsCSSTransforms | eSupportsContainLayoutAndPaint)) {
    return false;
  }
  return nsContainerFrame::IsFrameOfType(aFlags);
}

/* virtual */ void
nsRubyTextContainerFrame::SetInitialChildList(ChildListID aListID,
                                              nsFrameList& aChildList)
{
  nsContainerFrame::SetInitialChildList(aListID, aChildList);
  if (aListID == kPrincipalList) {
    UpdateSpanFlag();
  }
}

/* virtual */ void
nsRubyTextContainerFrame::AppendFrames(ChildListID aListID,
                                       nsFrameList& aFrameList)
{
  nsContainerFrame::AppendFrames(aListID, aFrameList);
  UpdateSpanFlag();
}

/* virtual */ void
nsRubyTextContainerFrame::InsertFrames(ChildListID aListID,
                                       nsIFrame* aPrevFrame,
                                       nsFrameList& aFrameList)
{
  nsContainerFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
  UpdateSpanFlag();
}

/* virtual */ void
nsRubyTextContainerFrame::RemoveFrame(ChildListID aListID,
                                      nsIFrame* aOldFrame)
{
  nsContainerFrame::RemoveFrame(aListID, aOldFrame);
  UpdateSpanFlag();
}

void
nsRubyTextContainerFrame::UpdateSpanFlag()
{
  bool isSpan = false;
  // The continuation checks are safe here because spans never break.
  if (!GetPrevContinuation() && !GetNextContinuation()) {
    nsIFrame* onlyChild = mFrames.OnlyChild();
    if (onlyChild && onlyChild->IsPseudoFrame(GetContent())) {
      // Per CSS Ruby spec, if the only child of an rtc frame is
      // a pseudo rt frame, it spans all bases in the segment.
      isSpan = true;
    }
  }

  if (isSpan) {
    AddStateBits(NS_RUBY_TEXT_CONTAINER_IS_SPAN);
  } else {
    RemoveStateBits(NS_RUBY_TEXT_CONTAINER_IS_SPAN);
  }
}

/* virtual */ void
nsRubyTextContainerFrame::Reflow(nsPresContext* aPresContext,
                                 ReflowOutput& aDesiredSize,
                                 const ReflowInput& aReflowInput,
                                 nsReflowStatus& aStatus)
{
  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsRubyTextContainerFrame");
  DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");

  // Although a ruby text container may have continuations, returning
  // complete reflow status is still safe, since its parent, ruby frame,
  // ignores the status, and continuations of the ruby base container
  // will take care of our continuations.
  WritingMode rtcWM = GetWritingMode();

  nscoord minBCoord = nscoord_MAX;
  nscoord maxBCoord = nscoord_MIN;
  // The container size is not yet known, so we use a dummy (0, 0) size.
  // The block-dir position will be corrected below after containerSize
  // is finalized.
  const nsSize dummyContainerSize;
  for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
    nsIFrame* child = e.get();
    MOZ_ASSERT(child->IsRubyTextFrame());
    LogicalRect rect = child->GetLogicalRect(rtcWM, dummyContainerSize);
    LogicalMargin margin = child->GetLogicalUsedMargin(rtcWM);
    nscoord blockStart = rect.BStart(rtcWM) - margin.BStart(rtcWM);
    minBCoord = std::min(minBCoord, blockStart);
    nscoord blockEnd = rect.BEnd(rtcWM) + margin.BEnd(rtcWM);
    maxBCoord = std::max(maxBCoord, blockEnd);
  }

  LogicalSize size(rtcWM, mISize, 0);
  if (!mFrames.IsEmpty()) {
    if (MOZ_UNLIKELY(minBCoord > maxBCoord)) {
      // XXX When bug 765861 gets fixed, this warning should be upgraded.
      NS_WARNING("bad block coord");
      minBCoord = maxBCoord = 0;
    }
    size.BSize(rtcWM) = maxBCoord - minBCoord;
    nsSize containerSize = size.GetPhysicalSize(rtcWM);
    for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
      nsIFrame* child = e.get();
      // We reflowed the child with a dummy container size, as the true size
      // was not yet known at that time.
      LogicalPoint pos = child->GetLogicalPosition(rtcWM, dummyContainerSize);
      // Adjust block position to account for minBCoord,
      // then reposition child based on the true container width.
      pos.B(rtcWM) -= minBCoord;
      // Relative positioning hasn't happened yet.
      // So MovePositionBy should not be used here.
      child->SetPosition(rtcWM, pos, containerSize);
      nsContainerFrame::PlaceFrameView(child);
    }
  }

  aDesiredSize.SetSize(rtcWM, size);
}