C++ InfallibleTArray::IsEmpty方法代码示例

nsIStyleRule*
nsAnimationManager::CheckAnimationRule(nsStyleContext* aStyleContext,
                                       mozilla::dom::Element* aElement)
{
  if (!mPresContext->IsProcessingAnimationStyleChange()) {
    if (!mPresContext->IsDynamic()) {
      // For print or print preview, ignore animations.
      return nullptr;
    }

    // Everything that causes our animation data to change triggers a
    // style change, which in turn triggers a non-animation restyle.
    // Likewise, when we initially construct frames, we're not in a
    // style change, but also not in an animation restyle.

    const nsStyleDisplay *disp = aStyleContext->StyleDisplay();
    ElementAnimations *ea =
      GetElementAnimations(aElement, aStyleContext->GetPseudoType(), false);
    if (!ea &&
        disp->mAnimationNameCount == 1 &&
        disp->mAnimations[0].GetName().IsEmpty()) {
      return nullptr;
    }

    // build the animations list
    InfallibleTArray<ElementAnimation> newAnimations;
    BuildAnimations(aStyleContext, newAnimations);

    if (newAnimations.IsEmpty()) {
      if (ea) {
        ea->Destroy();
      }
      return nullptr;
    }

    TimeStamp refreshTime = mPresContext->RefreshDriver()->MostRecentRefresh();

    if (ea) {
      ea->mStyleRule = nullptr;
      ea->mStyleRuleRefreshTime = TimeStamp();
      ea->UpdateAnimationGeneration(mPresContext);

      // Copy over the start times and (if still paused) pause starts
      // for each animation (matching on name only) that was also in the
      // old list of animations.
      // This means that we honor dynamic changes, which isn't what the
      // spec says to do, but WebKit seems to honor at least some of
      // them.  See
      // http://lists.w3.org/Archives/Public/www-style/2011Apr/0079.html
      // In order to honor what the spec said, we'd copy more data over
      // (or potentially optimize BuildAnimations to avoid rebuilding it
      // in the first place).
      if (!ea->mAnimations.IsEmpty()) {
        for (uint32_t newIdx = 0, newEnd = newAnimations.Length();
             newIdx != newEnd; ++newIdx) {
          ElementAnimation *newAnim = &newAnimations[newIdx];

          // Find the matching animation with this name in the old list
          // of animations.  Because of this code, they must all have
          // the same start time, though they might differ in pause
          // state.  So if a page uses multiple copies of the same
          // animation in one element's animation list, and gives them
          // different pause states, they, well, get what they deserve.
          // We'll use the last one since it's more likely to be the one
          // doing something.
          const ElementAnimation *oldAnim = nullptr;
          for (uint32_t oldIdx = ea->mAnimations.Length(); oldIdx-- != 0; ) {
            const ElementAnimation *a = &ea->mAnimations[oldIdx];
            if (a->mName == newAnim->mName) {
              oldAnim = a;
              break;
            }
          }
          if (!oldAnim) {
            continue;
          }

          newAnim->mStartTime = oldAnim->mStartTime;
          newAnim->mLastNotification = oldAnim->mLastNotification;

          if (oldAnim->IsPaused()) {
            if (newAnim->IsPaused()) {
              // Copy pause start just like start time.
              newAnim->mPauseStart = oldAnim->mPauseStart;
            } else {
              // Handle change in pause state by adjusting start
              // time to unpause.
              newAnim->mStartTime += refreshTime - oldAnim->mPauseStart;
            }
          }
        }
      }
    } else {
      ea = GetElementAnimations(aElement, aStyleContext->GetPseudoType(),
                                true);
    }
    ea->mAnimations.SwapElements(newAnimations);
    ea->mNeedsRefreshes = true;

    ea->EnsureStyleRuleFor(refreshTime, mPendingEvents, false);
//.........这里部分代码省略.........

void
nsAnimationManager::BuildAnimations(nsStyleContext* aStyleContext,
                                    InfallibleTArray<ElementAnimation>& aAnimations)
{
  NS_ABORT_IF_FALSE(aAnimations.IsEmpty(), "expect empty array");

  ResolvedStyleCache resolvedStyles;

  const nsStyleDisplay *disp = aStyleContext->StyleDisplay();
  TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
  for (uint32_t animIdx = 0, animEnd = disp->mAnimationNameCount;
       animIdx != animEnd; ++animIdx) {
    const nsAnimation& aSrc = disp->mAnimations[animIdx];
    ElementAnimation& aDest = *aAnimations.AppendElement();

    aDest.mName = aSrc.GetName();
    aDest.mIterationCount = aSrc.GetIterationCount();
    aDest.mDirection = aSrc.GetDirection();
    aDest.mFillMode = aSrc.GetFillMode();
    aDest.mPlayState = aSrc.GetPlayState();

    aDest.mDelay = TimeDuration::FromMilliseconds(aSrc.GetDelay());
    aDest.mStartTime = now;
    if (aDest.IsPaused()) {
      aDest.mPauseStart = now;
    } else {
      aDest.mPauseStart = TimeStamp();
    }

    aDest.mIterationDuration = TimeDuration::FromMilliseconds(aSrc.GetDuration());

    nsCSSKeyframesRule *rule = KeyframesRuleFor(aDest.mName);
    if (!rule) {
      // no segments
      continue;
    }

    // While current drafts of css3-animations say that later keyframes
    // with the same key entirely replace earlier ones (no cascading),
    // this is a bad idea and contradictory to the rest of CSS.  So
    // we're going to keep all the keyframes for each key and then do
    // the replacement on a per-property basis rather than a per-rule
    // basis, just like everything else in CSS.

    AutoInfallibleTArray<KeyframeData, 16> sortedKeyframes;

    for (uint32_t ruleIdx = 0, ruleEnd = rule->StyleRuleCount();
         ruleIdx != ruleEnd; ++ruleIdx) {
      css::Rule* cssRule = rule->GetStyleRuleAt(ruleIdx);
      NS_ABORT_IF_FALSE(cssRule, "must have rule");
      NS_ABORT_IF_FALSE(cssRule->GetType() == css::Rule::KEYFRAME_RULE,
                        "must be keyframe rule");
      nsCSSKeyframeRule *kfRule = static_cast<nsCSSKeyframeRule*>(cssRule);

      const nsTArray<float> &keys = kfRule->GetKeys();
      for (uint32_t keyIdx = 0, keyEnd = keys.Length();
           keyIdx != keyEnd; ++keyIdx) {
        float key = keys[keyIdx];
        // FIXME (spec):  The spec doesn't say what to do with
        // out-of-range keyframes.  We'll ignore them.
        // (And PercentageHashKey currently assumes we either ignore or
        // clamp them.)
        if (0.0f <= key && key <= 1.0f) {
          KeyframeData *data = sortedKeyframes.AppendElement();
          data->mKey = key;
          data->mIndex = ruleIdx;
          data->mRule = kfRule;
        }
      }
    }

    sortedKeyframes.Sort(KeyframeDataComparator());

    if (sortedKeyframes.Length() == 0) {
      // no segments
      continue;
    }

    // Record the properties that are present in any keyframe rules we
    // are using.
    nsCSSPropertySet properties;

    for (uint32_t kfIdx = 0, kfEnd = sortedKeyframes.Length();
         kfIdx != kfEnd; ++kfIdx) {
      css::Declaration *decl = sortedKeyframes[kfIdx].mRule->Declaration();
      for (uint32_t propIdx = 0, propEnd = decl->Count();
           propIdx != propEnd; ++propIdx) {
        properties.AddProperty(decl->OrderValueAt(propIdx));
      }
    }

    for (nsCSSProperty prop = nsCSSProperty(0);
         prop < eCSSProperty_COUNT_no_shorthands;
         prop = nsCSSProperty(prop + 1)) {
      if (!properties.HasProperty(prop) ||
          nsCSSProps::kAnimTypeTable[prop] == eStyleAnimType_None) {
        continue;
      }

      // Build a list of the keyframes to use for this property.  This
//.........这里部分代码省略.........

void
nsAnimationManager::BuildAnimations(nsStyleContext* aStyleContext,
                                    InfallibleTArray<ElementAnimation>& aAnimations)
{
  NS_ABORT_IF_FALSE(aAnimations.IsEmpty(), "expect empty array");

  ResolvedStyleCache resolvedStyles;

  const nsStyleDisplay *disp = aStyleContext->GetStyleDisplay();
  TimeStamp now = mPresContext->RefreshDriver()->MostRecentRefresh();
  for (PRUint32 animIdx = 0, animEnd = disp->mAnimations.Length();
       animIdx != animEnd; ++animIdx) {
    const nsAnimation& aSrc = disp->mAnimations[animIdx];
    ElementAnimation& aDest = *aAnimations.AppendElement();

    aDest.mName = aSrc.GetName();
    aDest.mIterationCount = aSrc.GetIterationCount();
    aDest.mDirection = aSrc.GetDirection();
    aDest.mFillMode = aSrc.GetFillMode();
    aDest.mPlayState = aSrc.GetPlayState();

    aDest.mStartTime = now + TimeDuration::FromMilliseconds(aSrc.GetDelay());
    if (aDest.IsPaused()) {
      aDest.mPauseStart = now;
    } else {
      aDest.mPauseStart = TimeStamp();
    }

    aDest.mIterationDuration = TimeDuration::FromMilliseconds(aSrc.GetDuration());

    nsCSSKeyframesRule *rule = KeyframesRuleFor(aDest.mName);
    if (!rule) {
      // no segments
      continue;
    }

    // Build the set of unique keyframes in the @keyframes rule.  Per
    // css3-animations, later keyframes with the same key replace
    // earlier ones (no cascading).
    nsDataHashtable<PercentageHashKey, nsCSSKeyframeRule*> keyframes;
    keyframes.Init(16); // FIXME: make infallible!
    for (PRUint32 ruleIdx = 0, ruleEnd = rule->StyleRuleCount();
         ruleIdx != ruleEnd; ++ruleIdx) {
      css::Rule* cssRule = rule->GetStyleRuleAt(ruleIdx);
      NS_ABORT_IF_FALSE(cssRule, "must have rule");
      NS_ABORT_IF_FALSE(cssRule->GetType() == css::Rule::KEYFRAME_RULE,
                        "must be keyframe rule");
      nsCSSKeyframeRule *kfRule = static_cast<nsCSSKeyframeRule*>(cssRule);

      const nsTArray<float> &keys = kfRule->GetKeys();
      for (PRUint32 keyIdx = 0, keyEnd = keys.Length();
           keyIdx != keyEnd; ++keyIdx) {
        float key = keys[keyIdx];
        // FIXME (spec):  The spec doesn't say what to do with
        // out-of-range keyframes.  We'll ignore them.
        // (And PercentageHashKey currently assumes we either ignore or
        // clamp them.)
        if (0.0f <= key && key <= 1.0f) {
          keyframes.Put(key, kfRule);
        }
      }
    }

    KeyframeDataArray sortedKeyframes;
    keyframes.EnumerateRead(AppendKeyframeData, &sortedKeyframes);
    sortedKeyframes.Sort(KeyframeDataComparator());

    if (sortedKeyframes.Length() == 0) {
      // no segments
      continue;
    }

    // Record the properties that are present in any keyframe rules we
    // are using.
    nsCSSPropertySet properties;

    for (PRUint32 kfIdx = 0, kfEnd = sortedKeyframes.Length();
         kfIdx != kfEnd; ++kfIdx) {
      css::Declaration *decl = sortedKeyframes[kfIdx].mRule->Declaration();
      for (PRUint32 propIdx = 0, propEnd = decl->Count();
           propIdx != propEnd; ++propIdx) {
        properties.AddProperty(decl->OrderValueAt(propIdx));
      }
    }

    for (nsCSSProperty prop = nsCSSProperty(0);
         prop < eCSSProperty_COUNT_no_shorthands;
         prop = nsCSSProperty(prop + 1)) {
      if (!properties.HasProperty(prop) ||
          nsCSSProps::kAnimTypeTable[prop] == eStyleAnimType_None) {
        continue;
      }

      AnimationProperty &propData = *aDest.mProperties.AppendElement();
      propData.mProperty = prop;

      KeyframeData *fromKeyframe = nsnull;
      nsRefPtr<nsStyleContext> fromContext;
      bool interpolated = true;
      for (PRUint32 kfIdx = 0, kfEnd = sortedKeyframes.Length();
//.........这里部分代码省略.........