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AnimationCommon.cpp
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AnimationCommon.cpp
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* 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 "gfxPlatform.h"
#include "AnimationCommon.h"
#include "nsRuleData.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSValue.h"
#include "nsStyleContext.h"
#include "nsIFrame.h"
#include "nsAnimationManager.h"
#include "nsLayoutUtils.h"
#include "mozilla/LookAndFeel.h"
#include "Layers.h"
#include "FrameLayerBuilder.h"
#include "nsDisplayList.h"
#include "mozilla/Preferences.h"
using namespace mozilla::layers;
namespace mozilla {
namespace css {
/* static */ bool
IsGeometricProperty(nsCSSProperty aProperty)
{
switch (aProperty) {
case eCSSProperty_bottom:
case eCSSProperty_height:
case eCSSProperty_left:
case eCSSProperty_right:
case eCSSProperty_top:
case eCSSProperty_width:
return true;
default:
return false;
}
}
CommonAnimationManager::CommonAnimationManager(nsPresContext *aPresContext)
: mPresContext(aPresContext)
{
PR_INIT_CLIST(&mElementData);
}
CommonAnimationManager::~CommonAnimationManager()
{
NS_ABORT_IF_FALSE(!mPresContext, "Disconnect should have been called");
}
void
CommonAnimationManager::Disconnect()
{
// Content nodes might outlive the transition or animation manager.
RemoveAllElementData();
mPresContext = nullptr;
}
void
CommonAnimationManager::AddElementData(CommonElementAnimationData* aData)
{
if (PR_CLIST_IS_EMPTY(&mElementData)) {
// We need to observe the refresh driver.
nsRefreshDriver *rd = mPresContext->RefreshDriver();
rd->AddRefreshObserver(this, Flush_Style);
}
PR_INSERT_BEFORE(aData, &mElementData);
}
void
CommonAnimationManager::ElementDataRemoved()
{
// If we have no transitions or animations left, remove ourselves from
// the refresh driver.
if (PR_CLIST_IS_EMPTY(&mElementData)) {
mPresContext->RefreshDriver()->RemoveRefreshObserver(this, Flush_Style);
}
}
void
CommonAnimationManager::RemoveAllElementData()
{
while (!PR_CLIST_IS_EMPTY(&mElementData)) {
CommonElementAnimationData *head =
static_cast<CommonElementAnimationData*>(PR_LIST_HEAD(&mElementData));
head->Destroy();
}
}
/*
* nsISupports implementation
*/
NS_IMPL_ISUPPORTS1(CommonAnimationManager, nsIStyleRuleProcessor)
nsRestyleHint
CommonAnimationManager::HasStateDependentStyle(StateRuleProcessorData* aData)
{
return nsRestyleHint(0);
}
bool
CommonAnimationManager::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
return false;
}
nsRestyleHint
CommonAnimationManager::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
{
return nsRestyleHint(0);
}
/* virtual */ bool
CommonAnimationManager::MediumFeaturesChanged(nsPresContext* aPresContext)
{
return false;
}
/* virtual */ size_t
CommonAnimationManager::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mElementData
//
// The following members are not measured
// - mPresContext, because it's non-owning
return 0;
}
/* virtual */ size_t
CommonAnimationManager::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf) const
{
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
/* static */ bool
CommonAnimationManager::ExtractComputedValueForTransition(
nsCSSProperty aProperty,
nsStyleContext* aStyleContext,
nsStyleAnimation::Value& aComputedValue)
{
bool result =
nsStyleAnimation::ExtractComputedValue(aProperty, aStyleContext,
aComputedValue);
if (aProperty == eCSSProperty_visibility) {
NS_ABORT_IF_FALSE(aComputedValue.GetUnit() ==
nsStyleAnimation::eUnit_Enumerated,
"unexpected unit");
aComputedValue.SetIntValue(aComputedValue.GetIntValue(),
nsStyleAnimation::eUnit_Visibility);
}
return result;
}
/* static */ bool
CommonAnimationManager::ThrottlingEnabled()
{
static bool sThrottlePref = false;
static bool sThrottlePrefCached = false;
if (!sThrottlePrefCached) {
Preferences::AddBoolVarCache(&sThrottlePref,
"layers.offmainthreadcomposition.throttle-animations", false);
sThrottlePrefCached = true;
}
return sThrottlePref;
}
NS_IMPL_ISUPPORTS1(AnimValuesStyleRule, nsIStyleRule)
/* virtual */ void
AnimValuesStyleRule::MapRuleInfoInto(nsRuleData* aRuleData)
{
nsStyleContext *contextParent = aRuleData->mStyleContext->GetParent();
if (contextParent && contextParent->HasPseudoElementData()) {
// Don't apply transitions or animations to things inside of
// pseudo-elements.
// FIXME (Bug 522599): Add tests for this.
return;
}
for (uint32_t i = 0, i_end = mPropertyValuePairs.Length(); i < i_end; ++i) {
PropertyValuePair &cv = mPropertyValuePairs[i];
if (aRuleData->mSIDs & nsCachedStyleData::GetBitForSID(
nsCSSProps::kSIDTable[cv.mProperty]))
{
nsCSSValue *prop = aRuleData->ValueFor(cv.mProperty);
if (prop->GetUnit() == eCSSUnit_Null) {
#ifdef DEBUG
bool ok =
#endif
nsStyleAnimation::UncomputeValue(cv.mProperty, cv.mValue, *prop);
NS_ABORT_IF_FALSE(ok, "could not store computed value");
}
}
}
}
#ifdef DEBUG
/* virtual */ void
AnimValuesStyleRule::List(FILE* out, int32_t aIndent) const
{
for (int32_t index = aIndent; --index >= 0; ) fputs(" ", out);
fputs("[anim values] { ", out);
for (uint32_t i = 0, i_end = mPropertyValuePairs.Length(); i < i_end; ++i) {
const PropertyValuePair &pair = mPropertyValuePairs[i];
nsAutoString value;
nsStyleAnimation::UncomputeValue(pair.mProperty, pair.mValue, value);
fprintf(out, "%s: %s; ", nsCSSProps::GetStringValue(pair.mProperty).get(),
NS_ConvertUTF16toUTF8(value).get());
}
fputs("}\n", out);
}
#endif
void
ComputedTimingFunction::Init(const nsTimingFunction &aFunction)
{
mType = aFunction.mType;
if (mType == nsTimingFunction::Function) {
mTimingFunction.Init(aFunction.mFunc.mX1, aFunction.mFunc.mY1,
aFunction.mFunc.mX2, aFunction.mFunc.mY2);
} else {
mSteps = aFunction.mSteps;
}
}
static inline double
StepEnd(uint32_t aSteps, double aPortion)
{
NS_ABORT_IF_FALSE(0.0 <= aPortion && aPortion <= 1.0, "out of range");
uint32_t step = uint32_t(aPortion * aSteps); // floor
return double(step) / double(aSteps);
}
double
ComputedTimingFunction::GetValue(double aPortion) const
{
switch (mType) {
case nsTimingFunction::Function:
return mTimingFunction.GetSplineValue(aPortion);
case nsTimingFunction::StepStart:
// There are diagrams in the spec that seem to suggest this check
// and the bounds point should not be symmetric with StepEnd, but
// should actually step up at rather than immediately after the
// fraction points. However, we rely on rounding negative values
// up to zero, so we can't do that. And it's not clear the spec
// really meant it.
return 1.0 - StepEnd(mSteps, 1.0 - aPortion);
default:
NS_ABORT_IF_FALSE(false, "bad type");
// fall through
case nsTimingFunction::StepEnd:
return StepEnd(mSteps, aPortion);
}
}
bool
CommonElementAnimationData::CanAnimatePropertyOnCompositor(const dom::Element *aElement,
nsCSSProperty aProperty,
CanAnimateFlags aFlags)
{
bool shouldLog = nsLayoutUtils::IsAnimationLoggingEnabled();
if (shouldLog && !gfxPlatform::OffMainThreadCompositingEnabled()) {
nsCString message;
message.AppendLiteral("Performance warning: Compositor disabled");
LogAsyncAnimationFailure(message);
return false;
}
nsIFrame* frame = aElement->GetPrimaryFrame();
if (IsGeometricProperty(aProperty)) {
if (shouldLog) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation of geometric property '");
message.Append(nsCSSProps::GetStringValue(aProperty));
message.AppendLiteral("' is disabled");
LogAsyncAnimationFailure(message, aElement);
}
return false;
}
if (aProperty == eCSSProperty_opacity) {
bool enabled = nsLayoutUtils::AreOpacityAnimationsEnabled();
if (!enabled && shouldLog) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation of 'opacity' is disabled");
LogAsyncAnimationFailure(message);
}
return enabled;
}
if (aProperty == eCSSProperty_transform) {
if (frame->Preserves3D() &&
frame->Preserves3DChildren()) {
if (shouldLog) {
nsCString message;
message.AppendLiteral("Gecko bug: Async animation of 'preserve-3d' transforms is not supported. See bug 779598");
LogAsyncAnimationFailure(message, aElement);
}
return false;
}
if (frame->IsSVGTransformed()) {
if (shouldLog) {
nsCString message;
message.AppendLiteral("Gecko bug: Async 'transform' animations of frames with SVG transforms is not supported. See bug 779599");
LogAsyncAnimationFailure(message, aElement);
}
return false;
}
if (aFlags & CanAnimate_HasGeometricProperty) {
if (shouldLog) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation of 'transform' not possible due to presence of geometric properties");
LogAsyncAnimationFailure(message, aElement);
}
return false;
}
bool enabled = nsLayoutUtils::AreTransformAnimationsEnabled();
if (!enabled && shouldLog) {
nsCString message;
message.AppendLiteral("Performance warning: Async animation of 'transform' is disabled");
LogAsyncAnimationFailure(message);
}
return enabled;
}
return aFlags & CanAnimate_AllowPartial;
}
/* static */ void
CommonElementAnimationData::LogAsyncAnimationFailure(nsCString& aMessage,
const nsIContent* aContent)
{
if (aContent) {
aMessage.AppendLiteral(" [");
aMessage.Append(nsAtomCString(aContent->Tag()));
nsIAtom* id = aContent->GetID();
if (id) {
aMessage.AppendLiteral(" with id '");
aMessage.Append(nsAtomCString(aContent->GetID()));
aMessage.AppendLiteral("'");
}
aMessage.AppendLiteral("]");
}
aMessage.AppendLiteral("\n");
printf_stderr(aMessage.get());
}
bool
CommonElementAnimationData::CanThrottleTransformChanges(TimeStamp aTime)
{
if (!CommonAnimationManager::ThrottlingEnabled()) {
return false;
}
// If we know that the animation cannot cause overflow,
// we can just disable flushes for this animation.
// If we don't show scrollbars, we don't care about overflow.
if (LookAndFeel::GetInt(LookAndFeel::eIntID_ShowHideScrollbars) == 0) {
return true;
}
// If this animation can cause overflow, we can throttle some of the ticks.
if ((aTime - mStyleRuleRefreshTime) < TimeDuration::FromMilliseconds(200)) {
return true;
}
// If the nearest scrollable ancestor has overflow:hidden,
// we don't care about overflow.
nsIScrollableFrame* scrollable =
nsLayoutUtils::GetNearestScrollableFrame(mElement->GetPrimaryFrame());
if (!scrollable) {
return true;
}
nsPresContext::ScrollbarStyles ss = scrollable->GetScrollbarStyles();
if (ss.mVertical == NS_STYLE_OVERFLOW_HIDDEN &&
ss.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
scrollable->GetLogicalScrollPosition() == nsPoint(0, 0)) {
return true;
}
return false;
}
bool
CommonElementAnimationData::CanThrottleAnimation(TimeStamp aTime)
{
nsIFrame* frame = mElement->GetPrimaryFrame();
if (!frame) {
return false;
}
bool hasTransform = HasAnimationOfProperty(eCSSProperty_transform);
bool hasOpacity = HasAnimationOfProperty(eCSSProperty_opacity);
if (hasOpacity) {
Layer* layer = FrameLayerBuilder::GetDedicatedLayer(
frame, nsDisplayItem::TYPE_OPACITY);
if (!layer || mAnimationGeneration > layer->GetAnimationGeneration()) {
return false;
}
}
if (!hasTransform) {
return true;
}
Layer* layer = FrameLayerBuilder::GetDedicatedLayer(
frame, nsDisplayItem::TYPE_TRANSFORM);
if (!layer || mAnimationGeneration > layer->GetAnimationGeneration()) {
return false;
}
return CanThrottleTransformChanges(aTime);
}
void
CommonElementAnimationData::UpdateAnimationGeneration(nsPresContext* aPresContext)
{
mAnimationGeneration =
aPresContext->PresShell()->FrameConstructor()->GetAnimationGeneration();
}
}
}