| /* |
| * Copyright (C) 2015 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS |
| * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "WillChangeData.h" |
| |
| namespace WebCore { |
| |
| bool WillChangeData::operator==(const WillChangeData& other) const |
| { |
| return m_animatableFeatures == other.m_animatableFeatures; |
| } |
| |
| bool WillChangeData::containsScrollPosition() const |
| { |
| for (const auto& feature : m_animatableFeatures) { |
| if (feature.feature() == ScrollPosition) |
| return true; |
| } |
| return false; |
| } |
| |
| bool WillChangeData::containsContents() const |
| { |
| for (const auto& feature : m_animatableFeatures) { |
| if (feature.feature() == Contents) |
| return true; |
| } |
| return false; |
| } |
| |
| bool WillChangeData::containsProperty(CSSPropertyID property) const |
| { |
| for (const auto& feature : m_animatableFeatures) { |
| if (feature.property() == property) |
| return true; |
| } |
| return false; |
| } |
| |
| // "If any non-initial value of a property would create a stacking context on the element, |
| // specifying that property in will-change must create a stacking context on the element." |
| bool WillChangeData::propertyCreatesStackingContext(CSSPropertyID property) |
| { |
| switch (property) { |
| case CSSPropertyPerspective: |
| case CSSPropertyTransform: |
| case CSSPropertyTransformStyle: |
| case CSSPropertyWebkitTransformStyle: |
| case CSSPropertyClipPath: |
| case CSSPropertyWebkitClipPath: |
| case CSSPropertyMask: |
| case CSSPropertyOpacity: |
| case CSSPropertyPosition: |
| case CSSPropertyZIndex: |
| case CSSPropertyWebkitBoxReflect: |
| #if ENABLE(CSS_COMPOSITING) |
| case CSSPropertyMixBlendMode: |
| case CSSPropertyIsolation: |
| #endif |
| case CSSPropertyFilter: |
| #if ENABLE(FILTERS_LEVEL_2) |
| case CSSPropertyWebkitBackdropFilter: |
| #endif |
| case CSSPropertyWebkitMask: |
| case CSSPropertyWebkitMaskImage: |
| case CSSPropertyWebkitMaskBoxImage: |
| #if ENABLE(ACCELERATED_OVERFLOW_SCROLLING) |
| case CSSPropertyWebkitOverflowScrolling: |
| #endif |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool propertyTriggersCompositing(CSSPropertyID property) |
| { |
| switch (property) { |
| case CSSPropertyOpacity: |
| case CSSPropertyFilter: |
| #if ENABLE(FILTERS_LEVEL_2) |
| case CSSPropertyWebkitBackdropFilter: |
| #endif |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| static bool propertyTriggersCompositingOnBoxesOnly(CSSPropertyID property) |
| { |
| // Don't trigger for perspective and transform-style, because those |
| // only do compositing if they have a 3d-transformed descendant and |
| // we don't want to do compositing all the time. |
| // Similarly, we don't want -webkit-overflow-scrolling-touch to |
| // always composite if there's no scrollable overflow. |
| switch (property) { |
| case CSSPropertyTransform: |
| return true; |
| default: |
| return false; |
| } |
| } |
| |
| void WillChangeData::addFeature(Feature feature, CSSPropertyID propertyID) |
| { |
| ASSERT(feature == Property || propertyID == CSSPropertyInvalid); |
| m_animatableFeatures.append(AnimatableFeature(feature, propertyID)); |
| |
| m_canCreateStackingContext |= propertyCreatesStackingContext(propertyID); |
| |
| m_canTriggerCompositingOnInline |= propertyTriggersCompositing(propertyID); |
| m_canTriggerCompositing |= m_canTriggerCompositingOnInline | propertyTriggersCompositingOnBoxesOnly(propertyID); |
| } |
| |
| WillChangeData::FeaturePropertyPair WillChangeData::featureAt(size_t index) const |
| { |
| if (index >= m_animatableFeatures.size()) |
| return FeaturePropertyPair(Invalid, CSSPropertyInvalid); |
| |
| return m_animatableFeatures[index].featurePropertyPair(); |
| } |
| |
| } // namespace WebCore |