gecko/layout/style/AnimationCommon.cpp

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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is AnimationCommon, common animation code for transitions
* and animations.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2011
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "AnimationCommon.h"
#include "nsRuleData.h"
#include "nsCSSValue.h"
#include "nsStyleContext.h"
namespace mozilla {
namespace css {
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 = nsnull;
}
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);
}
PRBool
CommonAnimationManager::HasDocumentStateDependentStyle(StateRuleProcessorData* aData)
{
return PR_FALSE;
}
nsRestyleHint
CommonAnimationManager::HasAttributeDependentStyle(AttributeRuleProcessorData* aData)
{
return nsRestyleHint(0);
}
/* virtual */ PRBool
CommonAnimationManager::MediumFeaturesChanged(nsPresContext* aPresContext)
{
return PR_FALSE;
}
/* virtual */ PRInt64
CommonAnimationManager::SizeOf() const
{
return sizeof(*this);
}
/* static */ PRBool
CommonAnimationManager::ExtractComputedValueForTransition(
nsCSSProperty aProperty,
nsStyleContext* aStyleContext,
nsStyleAnimation::Value& aComputedValue)
{
PRBool 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;
}
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 (PRUint32 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
PRBool ok =
#endif
nsStyleAnimation::UncomputeValue(cv.mProperty,
aRuleData->mPresContext,
cv.mValue, *prop);
NS_ABORT_IF_FALSE(ok, "could not store computed value");
}
}
}
}
#ifdef DEBUG
/* virtual */ void
AnimValuesStyleRule::List(FILE* out, PRInt32 aIndent) const
{
// WRITE ME?
}
#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(PRUint32 aSteps, double aPortion)
{
NS_ABORT_IF_FALSE(0.0 <= aPortion && aPortion <= 1.0, "out of range");
PRUint32 step = PRUint32(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(PR_FALSE, "bad type");
// fall through
case nsTimingFunction::StepEnd:
return StepEnd(mSteps, aPortion);
}
}
}
}