layout/style/CSSKeyframesRule.cpp
author Nika Layzell <nika@thelayzells.com>
Tue, 25 Sep 2018 17:34:53 +0200
changeset 507828 5e6dae0c1e5a4939ccd406f14607f7fafffd45a7
parent 507497 9ec6a81e695aef5d519d0e8a79927a9d6e915c03
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/. */

#include "mozilla/dom/CSSKeyframesRule.h"

#include "mozilla/dom/CSSKeyframesRuleBinding.h"
#include "mozilla/dom/CSSRuleList.h"
#include "mozilla/ServoBindings.h"
#include "nsCOMArray.h"

#include <limits>

namespace mozilla {
namespace dom {

// -------------------------------------------
// CSSKeyframeList
//

class CSSKeyframeList : public dom::CSSRuleList
{
public:
  CSSKeyframeList(already_AddRefed<RawServoKeyframesRule> aRawRule,
                  StyleSheet* aSheet,
                  CSSKeyframesRule* aParentRule)
    : mStyleSheet(aSheet)
    , mParentRule(aParentRule)
    , mRawRule(aRawRule)
  {
    mRules.SetCount(Servo_KeyframesRule_GetCount(mRawRule));
  }

  NS_DECL_ISUPPORTS_INHERITED
  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(CSSKeyframeList, dom::CSSRuleList)

  void DropSheetReference()
  {
    if (!mStyleSheet) {
      return;
    }
    mStyleSheet = nullptr;
    for (css::Rule* rule : mRules) {
      if (rule) {
        rule->DropSheetReference();
      }
    }
  }

  StyleSheet* GetParentObject() final { return mStyleSheet; }

  CSSKeyframeRule* GetRule(uint32_t aIndex) {
    if (!mRules[aIndex]) {
      uint32_t line = 0, column = 0;
      RefPtr<RawServoKeyframe> rule =
        Servo_KeyframesRule_GetKeyframeAt(mRawRule, aIndex,
                                          &line, &column).Consume();
      CSSKeyframeRule* ruleObj =
        new CSSKeyframeRule(rule.forget(), mStyleSheet, mParentRule,
                            line, column);
      mRules.ReplaceObjectAt(ruleObj, aIndex);
    }
    return static_cast<CSSKeyframeRule*>(mRules[aIndex]);
  }

  CSSKeyframeRule* IndexedGetter(uint32_t aIndex, bool& aFound) final
  {
    if (aIndex >= mRules.Length()) {
      aFound = false;
      return nullptr;
    }
    aFound = true;
    return GetRule(aIndex);
  }

  void AppendRule() {
    mRules.AppendObject(nullptr);
  }

  void RemoveRule(uint32_t aIndex) {
    mRules.RemoveObjectAt(aIndex);
  }

  uint32_t Length() final { return mRules.Length(); }

  void DropReferences()
  {
    if (!mStyleSheet && !mParentRule) {
      return;
    }
    mStyleSheet = nullptr;
    mParentRule = nullptr;
    for (css::Rule* rule : mRules) {
      if (rule) {
        rule->DropParentRuleReference();
        rule->DropSheetReference();
      }
    }
  }

  size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
  {
    size_t n = aMallocSizeOf(this);
    for (const css::Rule* rule : mRules) {
      n += rule ? rule->SizeOfIncludingThis(aMallocSizeOf) : 0;
    }
    return n;
  }

private:
  virtual ~CSSKeyframeList() {
    MOZ_ASSERT(!mParentRule, "Backpointer should have been cleared");
    MOZ_ASSERT(!mStyleSheet, "Backpointer should have been cleared");
    DropAllRules();
  }

  void DropAllRules()
  {
    DropReferences();
    mRules.Clear();
    mRawRule = nullptr;
  }

  // may be nullptr when the style sheet drops the reference to us.
  StyleSheet* mStyleSheet = nullptr;
  CSSKeyframesRule* mParentRule = nullptr;
  RefPtr<RawServoKeyframesRule> mRawRule;
  nsCOMArray<css::Rule> mRules;
};

// QueryInterface implementation for CSSKeyframeList
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSKeyframeList)
NS_INTERFACE_MAP_END_INHERITING(dom::CSSRuleList)

NS_IMPL_ADDREF_INHERITED(CSSKeyframeList, dom::CSSRuleList)
NS_IMPL_RELEASE_INHERITED(CSSKeyframeList, dom::CSSRuleList)

NS_IMPL_CYCLE_COLLECTION_CLASS(CSSKeyframeList)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(CSSKeyframeList)
  tmp->DropAllRules();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END_INHERITED(dom::CSSRuleList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSKeyframeList,
                                                  dom::CSSRuleList)
  for (css::Rule* rule : tmp->mRules) {
    if (rule) {
      NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRules[i]");
      cb.NoteXPCOMChild(rule);
    }
  }
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

// -------------------------------------------
// CSSKeyframesRule
//

CSSKeyframesRule::CSSKeyframesRule(RefPtr<RawServoKeyframesRule> aRawRule,
                                   StyleSheet* aSheet,
                                   css::Rule* aParentRule,
                                   uint32_t aLine,
                                   uint32_t aColumn)
  : css::Rule(aSheet, aParentRule, aLine, aColumn)
  , mRawRule(std::move(aRawRule))
{
}

CSSKeyframesRule::~CSSKeyframesRule()
{
  if (mKeyframeList) {
    mKeyframeList->DropReferences();
  }
}

NS_IMPL_ADDREF_INHERITED(CSSKeyframesRule, css::Rule)
NS_IMPL_RELEASE_INHERITED(CSSKeyframesRule, css::Rule)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(CSSKeyframesRule)
NS_INTERFACE_MAP_END_INHERITING(css::Rule)

NS_IMPL_CYCLE_COLLECTION_CLASS(CSSKeyframesRule)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(CSSKeyframesRule,
                                                css::Rule)
  if (tmp->mKeyframeList) {
    tmp->mKeyframeList->DropReferences();
    tmp->mKeyframeList = nullptr;
  }
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(CSSKeyframesRule, Rule)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mKeyframeList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

/* virtual */ bool
CSSKeyframesRule::IsCCLeaf() const
{
  // If we don't have rule list constructed, we are a leaf.
  return Rule::IsCCLeaf() && !mKeyframeList;
}

#ifdef DEBUG
/* virtual */ void
CSSKeyframesRule::List(FILE* out, int32_t aIndent) const
{
  nsAutoCString str;
  for (int32_t i = 0; i < aIndent; i++) {
    str.AppendLiteral("  ");
  }
  Servo_KeyframesRule_Debug(mRawRule, &str);
  fprintf_stderr(out, "%s\n", str.get());
}
#endif

/* virtual */ void
CSSKeyframesRule::DropSheetReference()
{
  if (mKeyframeList) {
    mKeyframeList->DropSheetReference();
  }
  css::Rule::DropSheetReference();
}

static const uint32_t kRuleNotFound = std::numeric_limits<uint32_t>::max();

uint32_t
CSSKeyframesRule::FindRuleIndexForKey(const nsAString& aKey)
{
  NS_ConvertUTF16toUTF8 key(aKey);
  return Servo_KeyframesRule_FindRule(mRawRule, &key);
}

template<typename Func>
void
CSSKeyframesRule::UpdateRule(Func aCallback)
{
  aCallback();
  if (StyleSheet* sheet = GetStyleSheet()) {
    sheet->RuleChanged(this);
  }
}

void
CSSKeyframesRule::GetName(nsAString& aName) const
{
  nsAtom* name = Servo_KeyframesRule_GetName(mRawRule);
  aName = nsDependentAtomString(name);
}

void
CSSKeyframesRule::SetName(const nsAString& aName)
{
  RefPtr<nsAtom> name = NS_Atomize(aName);
  nsAtom* oldName = Servo_KeyframesRule_GetName(mRawRule);
  if (name == oldName) {
    return;
  }

  UpdateRule([this, &name]() {
    Servo_KeyframesRule_SetName(mRawRule, name.forget().take());
  });
}

void
CSSKeyframesRule::AppendRule(const nsAString& aRule)
{
  StyleSheet* sheet = GetStyleSheet();
  if (!sheet) {
    // We cannot parse the rule if we don't have a stylesheet.
    return;
  }

  NS_ConvertUTF16toUTF8 rule(aRule);
  UpdateRule([this, sheet, &rule]() {
    bool parsedOk = Servo_KeyframesRule_AppendRule(
      mRawRule, sheet->RawContents(), &rule);
    if (parsedOk && mKeyframeList) {
      mKeyframeList->AppendRule();
    }
  });
}

void
CSSKeyframesRule::DeleteRule(const nsAString& aKey)
{
  auto index = FindRuleIndexForKey(aKey);
  if (index == kRuleNotFound) {
    return;
  }

  UpdateRule([this, index]() {
    Servo_KeyframesRule_DeleteRule(mRawRule, index);
    if (mKeyframeList) {
      mKeyframeList->RemoveRule(index);
    }
  });
}

/* virtual */ void
CSSKeyframesRule::GetCssText(nsAString& aCssText) const
{
  Servo_KeyframesRule_GetCssText(mRawRule, &aCssText);
}

/* virtual */ dom::CSSRuleList*
CSSKeyframesRule::CssRules()
{
  if (!mKeyframeList) {
    mKeyframeList = new CSSKeyframeList(do_AddRef(mRawRule), mSheet, this);
  }
  return mKeyframeList;
}

/* virtual */ dom::CSSKeyframeRule*
CSSKeyframesRule::FindRule(const nsAString& aKey)
{
  auto index = FindRuleIndexForKey(aKey);
  if (index != kRuleNotFound) {
    // Construct mKeyframeList but ignore the result.
    CssRules();
    return mKeyframeList->GetRule(index);
  }
  return nullptr;
}

/* virtual */ size_t
CSSKeyframesRule::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
  size_t n = aMallocSizeOf(this);
  if (mKeyframeList) {
    n += mKeyframeList->SizeOfIncludingThis(aMallocSizeOf);
  }
  return n;
}

/* virtual */ JSObject*
CSSKeyframesRule::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
  return CSSKeyframesRule_Binding::Wrap(aCx, this, aGivenProto);
}

} // namespace dom
} // namespace mozilla