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gecko/content/smil/nsSMILAnimationFunction.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
* Chris Double <chris.double@double.co.nz>
* Daniel Holbert <dholbert@cs.stanford.edu>
*
* Alternatively, the contents of this file may be used under the terms of
* either of 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 "nsSMILAnimationFunction.h"
#include "nsISMILAttr.h"
#include "nsSMILParserUtils.h"
#include "nsSMILNullType.h"
#include "nsISMILAnimationElement.h"
#include "nsSMILTimedElement.h"
#include "nsGkAtoms.h"
#include "nsCOMPtr.h"
#include "nsCOMArray.h"
#include "nsIContent.h"
#include "nsAutoPtr.h"
#include "nsContentUtils.h"
#include "nsReadableUtils.h"
#include "nsString.h"
#include <math.h>
//----------------------------------------------------------------------
// Static members
nsAttrValue::EnumTable nsSMILAnimationFunction::sAccumulateTable[] = {
{"none", PR_FALSE},
{"sum", PR_TRUE},
{nsnull, 0}
};
nsAttrValue::EnumTable nsSMILAnimationFunction::sAdditiveTable[] = {
{"replace", PR_FALSE},
{"sum", PR_TRUE},
{nsnull, 0}
};
nsAttrValue::EnumTable nsSMILAnimationFunction::sCalcModeTable[] = {
{"linear", CALC_LINEAR},
{"discrete", CALC_DISCRETE},
{"paced", CALC_PACED},
{"spline", CALC_SPLINE},
{nsnull, 0}
};
// Any negative number should be fine as a sentinel here,
// because valid distances are non-negative.
#define COMPUTE_DISTANCE_ERROR (-1)
//----------------------------------------------------------------------
// Constructors etc.
nsSMILAnimationFunction::nsSMILAnimationFunction()
: mIsActive(PR_FALSE),
mIsFrozen(PR_FALSE),
mSampleTime(-1),
mRepeatIteration(0),
mLastValue(PR_FALSE),
mHasChanged(PR_TRUE),
mValueNeedsReparsingEverySample(PR_FALSE),
mBeginTime(LL_MININT),
mAnimationElement(nsnull),
mErrorFlags(0)
{
}
void
nsSMILAnimationFunction::SetAnimationElement(
nsISMILAnimationElement* aAnimationElement)
{
mAnimationElement = aAnimationElement;
}
PRBool
nsSMILAnimationFunction::SetAttr(nsIAtom* aAttribute, const nsAString& aValue,
nsAttrValue& aResult, nsresult* aParseResult)
{
PRBool foundMatch = PR_TRUE;
nsresult parseResult = NS_OK;
// The attributes 'by', 'from', 'to', and 'values' may be parsed differently
// depending on the element & attribute we're animating. So instead of
// parsing them now we re-parse them at every sample.
if (aAttribute == nsGkAtoms::by ||
aAttribute == nsGkAtoms::from ||
aAttribute == nsGkAtoms::to ||
aAttribute == nsGkAtoms::values) {
// We parse to, from, by, values at sample time.
// XXX Need to flag which attribute has changed and then when we parse it at
// sample time, report any errors and reset the flag
mHasChanged = PR_TRUE;
aResult.SetTo(aValue);
} else if (aAttribute == nsGkAtoms::accumulate) {
parseResult = SetAccumulate(aValue, aResult);
} else if (aAttribute == nsGkAtoms::additive) {
parseResult = SetAdditive(aValue, aResult);
} else if (aAttribute == nsGkAtoms::calcMode) {
parseResult = SetCalcMode(aValue, aResult);
} else if (aAttribute == nsGkAtoms::keyTimes) {
parseResult = SetKeyTimes(aValue, aResult);
} else if (aAttribute == nsGkAtoms::keySplines) {
parseResult = SetKeySplines(aValue, aResult);
} else {
foundMatch = PR_FALSE;
}
if (foundMatch && aParseResult) {
*aParseResult = parseResult;
}
return foundMatch;
}
PRBool
nsSMILAnimationFunction::UnsetAttr(nsIAtom* aAttribute)
{
PRBool foundMatch = PR_TRUE;
if (aAttribute == nsGkAtoms::by ||
aAttribute == nsGkAtoms::from ||
aAttribute == nsGkAtoms::to ||
aAttribute == nsGkAtoms::values) {
mHasChanged = PR_TRUE;
} else if (aAttribute == nsGkAtoms::accumulate) {
UnsetAccumulate();
} else if (aAttribute == nsGkAtoms::additive) {
UnsetAdditive();
} else if (aAttribute == nsGkAtoms::calcMode) {
UnsetCalcMode();
} else if (aAttribute == nsGkAtoms::keyTimes) {
UnsetKeyTimes();
} else if (aAttribute == nsGkAtoms::keySplines) {
UnsetKeySplines();
} else {
foundMatch = PR_FALSE;
}
return foundMatch;
}
void
nsSMILAnimationFunction::SampleAt(nsSMILTime aSampleTime,
const nsSMILTimeValue& aSimpleDuration,
PRUint32 aRepeatIteration)
{
if (mHasChanged || mLastValue || mSampleTime != aSampleTime ||
mSimpleDuration != aSimpleDuration ||
mRepeatIteration != aRepeatIteration) {
mHasChanged = PR_TRUE;
}
mSampleTime = aSampleTime;
mSimpleDuration = aSimpleDuration;
mRepeatIteration = aRepeatIteration;
mLastValue = PR_FALSE;
}
void
nsSMILAnimationFunction::SampleLastValue(PRUint32 aRepeatIteration)
{
if (mHasChanged || !mLastValue || mRepeatIteration != aRepeatIteration) {
mHasChanged = PR_TRUE;
}
mRepeatIteration = aRepeatIteration;
mLastValue = PR_TRUE;
}
void
nsSMILAnimationFunction::Activate(nsSMILTime aBeginTime)
{
mBeginTime = aBeginTime;
mIsActive = PR_TRUE;
mIsFrozen = PR_FALSE;
mFrozenValue = nsSMILValue();
mHasChanged = PR_TRUE;
}
void
nsSMILAnimationFunction::Inactivate(PRBool aIsFrozen)
{
mIsActive = PR_FALSE;
mIsFrozen = aIsFrozen;
mFrozenValue = nsSMILValue();
mHasChanged = PR_TRUE;
}
void
nsSMILAnimationFunction::ComposeResult(const nsISMILAttr& aSMILAttr,
nsSMILValue& aResult)
{
mHasChanged = PR_FALSE;
// Skip animations that are inactive or in error
if (!IsActiveOrFrozen() || mErrorFlags != 0)
return;
// Get the animation values
nsSMILValueArray values;
nsresult rv = GetValues(aSMILAttr, values);
if (NS_FAILED(rv))
return;
// Check that we have the right number of keySplines and keyTimes
CheckValueListDependentAttrs(values.Length());
if (mErrorFlags != 0)
return;
// If this interval is active, we must have a non-negative mSampleTime
NS_ABORT_IF_FALSE(mSampleTime >= 0 || !mIsActive,
"Negative sample time for active animation");
NS_ABORT_IF_FALSE(mSimpleDuration.IsResolved() ||
mSimpleDuration.IsIndefinite() || mLastValue,
"Unresolved simple duration for active or frozen animation");
nsSMILValue result(aResult.mType);
if (mSimpleDuration.IsIndefinite() ||
(values.Length() == 1 && TreatSingleValueAsStatic())) {
// Indefinite duration or only one value set: Always set the first value
result = values[0];
} else if (mLastValue) {
// Sampling last value
const nsSMILValue& last = values[values.Length() - 1];
result = last;
// See comment in AccumulateResult: to-animation does not accumulate
if (!IsToAnimation() && GetAccumulate() && mRepeatIteration) {
// If the target attribute type doesn't support addition Add will
// fail leaving result = last
result.Add(last, mRepeatIteration);
}
} else if (!mFrozenValue.IsNull() && !mHasChanged) {
// Frozen to animation
result = mFrozenValue;
} else {
// Interpolation
if (NS_FAILED(InterpolateResult(values, result, aResult)))
return;
if (NS_FAILED(AccumulateResult(values, result)))
return;
if (IsToAnimation() && mIsFrozen) {
mFrozenValue = result;
}
}
// If additive animation isn't required or isn't supported, set the value.
if (!IsAdditive() || NS_FAILED(aResult.SandwichAdd(result))) {
aResult.Swap(result);
// Note: The old value of aResult is now in |result|, and it will get
// cleaned up when |result| goes out of scope, when this function returns.
}
}
PRInt8
nsSMILAnimationFunction::CompareTo(const nsSMILAnimationFunction* aOther) const
{
NS_ENSURE_TRUE(aOther, 0);
NS_ASSERTION(aOther != this, "Trying to compare to self");
// Inactive animations sort first
if (!IsActiveOrFrozen() && aOther->IsActiveOrFrozen())
return -1;
if (IsActiveOrFrozen() && !aOther->IsActiveOrFrozen())
return 1;
// Sort based on begin time
if (mBeginTime != aOther->GetBeginTime())
return mBeginTime > aOther->GetBeginTime() ? 1 : -1;
// Next sort based on syncbase dependencies: the dependent element sorts after
// its syncbase
const nsSMILTimedElement& thisTimedElement =
mAnimationElement->TimedElement();
const nsSMILTimedElement& otherTimedElement =
aOther->mAnimationElement->TimedElement();
if (thisTimedElement.IsTimeDependent(otherTimedElement))
return 1;
if (otherTimedElement.IsTimeDependent(thisTimedElement))
return -1;
// Animations that appear later in the document sort after those earlier in
// the document
nsIContent& thisContent = mAnimationElement->AsElement();
nsIContent& otherContent = aOther->mAnimationElement->AsElement();
NS_ABORT_IF_FALSE(&thisContent != &otherContent,
"Two animations cannot have the same animation content element!");
return (nsContentUtils::PositionIsBefore(&thisContent, &otherContent))
? -1 : 1;
}
PRBool
nsSMILAnimationFunction::WillReplace() const
{
/*
* In IsAdditive() we don't consider to-animation to be additive as it is
* a special case that is dealt with differently in the compositing method but
* here we return false for to animation as it builds on the underlying value
* unless its a frozen to animation.
*/
return !mErrorFlags && (!(IsAdditive() || IsToAnimation()) ||
(IsToAnimation() && mIsFrozen && !mHasChanged));
}
PRBool
nsSMILAnimationFunction::HasChanged() const
{
return mHasChanged || mValueNeedsReparsingEverySample;
}
PRBool
nsSMILAnimationFunction::UpdateCachedTarget(const nsSMILTargetIdentifier& aNewTarget)
{
if (!mLastTarget.Equals(aNewTarget)) {
mLastTarget = aNewTarget;
return PR_TRUE;
}
return PR_FALSE;
}
//----------------------------------------------------------------------
// Implementation helpers
nsresult
nsSMILAnimationFunction::InterpolateResult(const nsSMILValueArray& aValues,
nsSMILValue& aResult,
nsSMILValue& aBaseValue)
{
nsresult rv = NS_OK;
const nsSMILTime& dur = mSimpleDuration.GetMillis();
// Sanity Checks
NS_ABORT_IF_FALSE(mSampleTime >= 0.0f, "Sample time should not be negative");
NS_ABORT_IF_FALSE(dur >= 0.0f, "Simple duration should not be negative");
if (mSampleTime >= dur || mSampleTime < 0.0f) {
NS_ERROR("Animation sampled outside interval");
return NS_ERROR_FAILURE;
}
if ((!IsToAnimation() && aValues.Length() < 2) ||
(IsToAnimation() && aValues.Length() != 1)) {
NS_ERROR("Unexpected number of values");
return NS_ERROR_FAILURE;
}
// End Sanity Checks
double fTime = double(mSampleTime);
double fDur = double(dur);
// Get the normalised progress through the simple duration
double simpleProgress = (fDur > 0.0) ? fTime / fDur : 0.0;
// Handle bad keytimes (where first != 0 and/or last != 1)
// See http://brian.sol1.net/svg/range-for-keytimes for more info.
if (HasAttr(nsGkAtoms::keyTimes) &&
GetCalcMode() != CALC_PACED) {
double first = mKeyTimes[0];
if (first > 0.0 && simpleProgress < first) {
if (!IsToAnimation())
aResult = aValues[0];
return rv;
}
double last = mKeyTimes[mKeyTimes.Length() - 1];
if (last < 1.0 && simpleProgress >= last) {
if (IsToAnimation())
aResult = aValues[0];
else
aResult = aValues[aValues.Length() - 1];
return rv;
}
}
if (GetCalcMode() != CALC_DISCRETE) {
// Get the normalised progress between adjacent values
const nsSMILValue* from = nsnull;
const nsSMILValue* to = nsnull;
double intervalProgress;
if (IsToAnimation()) {
from = &aBaseValue;
to = &aValues[0];
if (GetCalcMode() == CALC_PACED) {
// Note: key[Times/Splines/Points] are ignored for calcMode="paced"
intervalProgress = simpleProgress;
} else {
ScaleSimpleProgress(simpleProgress);
intervalProgress = simpleProgress;
ScaleIntervalProgress(intervalProgress, 0, 1);
}
} else {
if (GetCalcMode() == CALC_PACED) {
rv = ComputePacedPosition(aValues, simpleProgress,
intervalProgress, from, to);
// Note: If the above call fails, we'll skip the "from->Interpolate"
// call below, and we'll drop into the CALC_DISCRETE section
// instead. (as the spec says we should, because our failure was
// presumably due to the values being non-additive)
} else { // GetCalcMode() == CALC_LINEAR or GetCalcMode() == CALC_SPLINE
ScaleSimpleProgress(simpleProgress);
PRUint32 index = (PRUint32)floor(simpleProgress *
(aValues.Length() - 1));
from = &aValues[index];
to = &aValues[index + 1];
intervalProgress = simpleProgress * (aValues.Length() - 1) - index;
ScaleIntervalProgress(intervalProgress, index, aValues.Length() - 1);
}
}
if (NS_SUCCEEDED(rv)) {
NS_ABORT_IF_FALSE(from, "NULL from-value during interpolation");
NS_ABORT_IF_FALSE(to, "NULL to-value during interpolation");
NS_ABORT_IF_FALSE(0.0f <= intervalProgress && intervalProgress < 1.0f,
"Interval progress should be in the range [0, 1)");
rv = from->Interpolate(*to, intervalProgress, aResult);
}
}
// Discrete-CalcMode case
// Note: If interpolation failed (isn't supported for this type), the SVG
// spec says to force discrete mode.
if (GetCalcMode() == CALC_DISCRETE || NS_FAILED(rv)) {
if (IsToAnimation()) {
// SMIL 3, 12.6.4: Since a to animation has only 1 value, a discrete to
// animation will simply set the to value for the simple duration.
aResult = aValues[0];
} else {
PRUint32 index = (PRUint32) floor(simpleProgress * (aValues.Length()));
aResult = aValues[index];
}
rv = NS_OK;
}
return rv;
}
nsresult
nsSMILAnimationFunction::AccumulateResult(const nsSMILValueArray& aValues,
nsSMILValue& aResult)
{
if (!IsToAnimation() && GetAccumulate() && mRepeatIteration)
{
const nsSMILValue& lastValue = aValues[aValues.Length() - 1];
// If the target attribute type doesn't support addition, Add will
// fail and we leave aResult untouched.
aResult.Add(lastValue, mRepeatIteration);
}
return NS_OK;
}
/*
* Given the simple progress for a paced animation, this method:
* - determines which two elements of the values array we're in between
* (returned as aFrom and aTo)
* - determines where we are between them
* (returned as aIntervalProgress)
*
* Returns NS_OK, or NS_ERROR_FAILURE if our values don't support distance
* computation.
*/
nsresult
nsSMILAnimationFunction::ComputePacedPosition(const nsSMILValueArray& aValues,
double aSimpleProgress,
double& aIntervalProgress,
const nsSMILValue*& aFrom,
const nsSMILValue*& aTo)
{
NS_ASSERTION(0.0f <= aSimpleProgress && aSimpleProgress < 1.0f,
"aSimpleProgress is out of bounds");
NS_ASSERTION(GetCalcMode() == CALC_PACED,
"Calling paced-specific function, but not in paced mode");
NS_ABORT_IF_FALSE(aValues.Length() >= 2, "Unexpected number of values");
// Trivial case: If we have just 2 values, then there's only one interval
// for us to traverse, and our progress across that interval is the exact
// same as our overall progress.
if (aValues.Length() == 2) {
aIntervalProgress = aSimpleProgress;
aFrom = &aValues[0];
aTo = &aValues[1];
return NS_OK;
}
double totalDistance = ComputePacedTotalDistance(aValues);
if (totalDistance == COMPUTE_DISTANCE_ERROR)
return NS_ERROR_FAILURE;
// total distance we should have moved at this point in time.
// (called 'remainingDist' due to how it's used in loop below)
double remainingDist = aSimpleProgress * totalDistance;
// Must be satisfied, because totalDistance is a sum of (non-negative)
// distances, and aSimpleProgress is non-negative
NS_ASSERTION(remainingDist >= 0, "distance values must be non-negative");
// Find where remainingDist puts us in the list of values
// Note: We could optimize this next loop by caching the
// interval-distances in an array, but maybe that's excessive.
for (PRUint32 i = 0; i < aValues.Length() - 1; i++) {
// Note: The following assertion is valid because remainingDist should
// start out non-negative, and this loop never shaves off more than its
// current value.
NS_ASSERTION(remainingDist >= 0, "distance values must be non-negative");
double curIntervalDist;
nsresult rv = aValues[i].ComputeDistance(aValues[i+1], curIntervalDist);
NS_ABORT_IF_FALSE(NS_SUCCEEDED(rv),
"If we got through ComputePacedTotalDistance, we should "
"be able to recompute each sub-distance without errors");
NS_ASSERTION(curIntervalDist >= 0, "distance values must be non-negative");
// Clamp distance value at 0, just in case ComputeDistance is evil.
curIntervalDist = NS_MAX(curIntervalDist, 0.0);
if (remainingDist >= curIntervalDist) {
remainingDist -= curIntervalDist;
} else {
// NOTE: If we get here, then curIntervalDist necessarily is not 0. Why?
// Because this clause is only hit when remainingDist < curIntervalDist,
// and if curIntervalDist were 0, that would mean remainingDist would
// have to be < 0. But that can't happen, because remainingDist (as
// a distance) is non-negative by definition.
NS_ASSERTION(curIntervalDist != 0,
"We should never get here with this set to 0...");
// We found the right spot -- an interpolated position between
// values i and i+1.
aFrom = &aValues[i];
aTo = &aValues[i+1];
aIntervalProgress = remainingDist / curIntervalDist;
return NS_OK;
}
}
NS_NOTREACHED("shouldn't complete loop & get here -- if we do, "
"then aSimpleProgress was probably out of bounds");
return NS_ERROR_FAILURE;
}
/*
* Computes the total distance to be travelled by a paced animation.
*
* Returns the total distance, or returns COMPUTE_DISTANCE_ERROR if
* our values don't support distance computation.
*/
double
nsSMILAnimationFunction::ComputePacedTotalDistance(
const nsSMILValueArray& aValues) const
{
NS_ASSERTION(GetCalcMode() == CALC_PACED,
"Calling paced-specific function, but not in paced mode");
double totalDistance = 0.0;
for (PRUint32 i = 0; i < aValues.Length() - 1; i++) {
double tmpDist;
nsresult rv = aValues[i].ComputeDistance(aValues[i+1], tmpDist);
if (NS_FAILED(rv)) {
return COMPUTE_DISTANCE_ERROR;
}
// Clamp distance value to 0, just in case we have an evil ComputeDistance
// implementation somewhere
NS_ABORT_IF_FALSE(tmpDist >= 0.0f, "distance values must be non-negative");
tmpDist = NS_MAX(tmpDist, 0.0);
totalDistance += tmpDist;
}
return totalDistance;
}
/*
* Scale the simple progress, taking into account any keyTimes.
*/
void
nsSMILAnimationFunction::ScaleSimpleProgress(double& aProgress)
{
if (!HasAttr(nsGkAtoms::keyTimes))
return;
PRUint32 numTimes = mKeyTimes.Length();
if (numTimes < 2)
return;
PRUint32 i = 0;
for (; i < numTimes - 2 && aProgress >= mKeyTimes[i+1]; ++i);
double& intervalStart = mKeyTimes[i];
double& intervalEnd = mKeyTimes[i+1];
double intervalLength = intervalEnd - intervalStart;
if (intervalLength <= 0.0) {
aProgress = intervalStart;
return;
}
aProgress = (i + (aProgress - intervalStart) / intervalLength) *
1.0 / double(numTimes - 1);
}
/*
* Scale the interval progress, taking into account any keySplines
* or discrete methods.
*/
void
nsSMILAnimationFunction::ScaleIntervalProgress(double& aProgress,
PRUint32 aIntervalIndex,
PRUint32 aNumIntervals)
{
if (GetCalcMode() != CALC_SPLINE)
return;
if (!HasAttr(nsGkAtoms::keySplines))
return;
NS_ASSERTION(aIntervalIndex < (PRUint32)mKeySplines.Length(),
"Invalid interval index");
NS_ASSERTION(aNumIntervals >= 1, "Invalid number of intervals");
if (aIntervalIndex >= (PRUint32)mKeySplines.Length() ||
aNumIntervals < 1)
return;
nsSMILKeySpline const &spline = mKeySplines[aIntervalIndex];
aProgress = spline.GetSplineValue(aProgress);
}
PRBool
nsSMILAnimationFunction::HasAttr(nsIAtom* aAttName) const
{
return mAnimationElement->HasAnimAttr(aAttName);
}
const nsAttrValue*
nsSMILAnimationFunction::GetAttr(nsIAtom* aAttName) const
{
return mAnimationElement->GetAnimAttr(aAttName);
}
PRBool
nsSMILAnimationFunction::GetAttr(nsIAtom* aAttName, nsAString& aResult) const
{
return mAnimationElement->GetAnimAttr(aAttName, aResult);
}
/*
* A utility function to make querying an attribute that corresponds to an
* nsSMILValue a little neater.
*
* @param aAttName The attribute name (in the global namespace).
* @param aSMILAttr The SMIL attribute to perform the parsing.
* @param[out] aResult The resulting nsSMILValue.
* @param[out] aPreventCachingOfSandwich
* If |aResult| contains dependencies on its context that
* should prevent the result of the animation sandwich from
* being cached and reused in future samples (as reported
* by nsISMILAttr::ValueFromString), then this outparam
* will be set to PR_TRUE. Otherwise it is left unmodified.
*
* Returns PR_FALSE if a parse error occurred, otherwise returns PR_TRUE.
*/
PRBool
nsSMILAnimationFunction::ParseAttr(nsIAtom* aAttName,
const nsISMILAttr& aSMILAttr,
nsSMILValue& aResult,
PRBool& aPreventCachingOfSandwich) const
{
nsAutoString attValue;
if (GetAttr(aAttName, attValue)) {
PRBool preventCachingOfSandwich;
nsresult rv = aSMILAttr.ValueFromString(attValue, mAnimationElement,
aResult, preventCachingOfSandwich);
if (NS_FAILED(rv))
return PR_FALSE;
if (preventCachingOfSandwich) {
aPreventCachingOfSandwich = PR_TRUE;
}
}
return PR_TRUE;
}
/*
* SMILANIM specifies the following rules for animation function values:
*
* (1) if values is set, it overrides everything
* (2) for from/to/by animation at least to or by must be specified, from on its
* own (or nothing) is an error--which we will ignore
* (3) if both by and to are specified only to will be used, by will be ignored
* (4) if by is specified without from (by animation), forces additive behaviour
* (5) if to is specified without from (to animation), special care needs to be
* taken when compositing animation as such animations are composited last.
*
* This helper method applies these rules to fill in the values list and to set
* some internal state.
*/
nsresult
nsSMILAnimationFunction::GetValues(const nsISMILAttr& aSMILAttr,
nsSMILValueArray& aResult)
{
if (!mAnimationElement)
return NS_ERROR_FAILURE;
mValueNeedsReparsingEverySample = PR_FALSE;
nsSMILValueArray result;
// If "values" is set, use it
if (HasAttr(nsGkAtoms::values)) {
nsAutoString attValue;
GetAttr(nsGkAtoms::values, attValue);
PRBool preventCachingOfSandwich;
nsresult rv = nsSMILParserUtils::ParseValues(attValue, mAnimationElement,
aSMILAttr, result,
preventCachingOfSandwich);
if (NS_FAILED(rv))
return rv;
if (preventCachingOfSandwich) {
mValueNeedsReparsingEverySample = PR_TRUE;
}
// Else try to/from/by
} else {
PRBool preventCachingOfSandwich = PR_FALSE;
PRBool parseOk = PR_TRUE;
nsSMILValue to, from, by;
parseOk &= ParseAttr(nsGkAtoms::to, aSMILAttr, to,
preventCachingOfSandwich);
parseOk &= ParseAttr(nsGkAtoms::from, aSMILAttr, from,
preventCachingOfSandwich);
parseOk &= ParseAttr(nsGkAtoms::by, aSMILAttr, by,
preventCachingOfSandwich);
if (preventCachingOfSandwich) {
mValueNeedsReparsingEverySample = PR_TRUE;
}
if (!parseOk)
return NS_ERROR_FAILURE;
result.SetCapacity(2);
if (!to.IsNull()) {
if (!from.IsNull()) {
result.AppendElement(from);
result.AppendElement(to);
} else {
result.AppendElement(to);
}
} else if (!by.IsNull()) {
nsSMILValue effectiveFrom(by.mType);
if (!from.IsNull())
effectiveFrom = from;
// Set values to 'from; from + by'
result.AppendElement(effectiveFrom);
nsSMILValue effectiveTo(effectiveFrom);
if (!effectiveTo.IsNull() && NS_SUCCEEDED(effectiveTo.Add(by))) {
result.AppendElement(effectiveTo);
} else {
// Using by-animation with non-additive type or bad base-value
return NS_ERROR_FAILURE;
}
} else {
// No values, no to, no by -- call it a day
return NS_ERROR_FAILURE;
}
}
result.SwapElements(aResult);
return NS_OK;
}
void
nsSMILAnimationFunction::CheckValueListDependentAttrs(PRUint32 aNumValues)
{
CheckKeyTimes(aNumValues);
CheckKeySplines(aNumValues);
}
/**
* Performs checks for the keyTimes attribute required by the SMIL spec but
* which depend on other attributes and therefore needs to be updated as
* dependent attributes are set.
*/
void
nsSMILAnimationFunction::CheckKeyTimes(PRUint32 aNumValues)
{
if (!HasAttr(nsGkAtoms::keyTimes))
return;
// attribute is ignored for calcMode = paced
if (GetCalcMode() == CALC_PACED) {
SetKeyTimesErrorFlag(PR_FALSE);
return;
}
if (mKeyTimes.Length() < 1) {
// keyTimes isn't set or failed preliminary checks
SetKeyTimesErrorFlag(PR_TRUE);
return;
}
// no. keyTimes == no. values
if ((mKeyTimes.Length() != aNumValues && !IsToAnimation()) ||
(IsToAnimation() && mKeyTimes.Length() != 2)) {
SetKeyTimesErrorFlag(PR_TRUE);
return;
}
// special handling if there is only one keyTime. The spec doesn't say what to
// do in this case so we allow the keyTime to be either 0 or 1.
if (mKeyTimes.Length() == 1) {
double time = mKeyTimes[0];
SetKeyTimesErrorFlag(!(time == 0.0 || time == 1.0));
return;
}
// According to the spec, the first value should be 0 and for linear or spline
// calcMode's the last value should be 1, but then an example is give with
// a spline calcMode and keyTimes "0.0; 0.7". So we don't bother checking
// the end-values here but just allow bad specs.
SetKeyTimesErrorFlag(PR_FALSE);
}
void
nsSMILAnimationFunction::CheckKeySplines(PRUint32 aNumValues)
{
// attribute is ignored if calc mode is not spline
if (GetCalcMode() != CALC_SPLINE) {
SetKeySplinesErrorFlag(PR_FALSE);
return;
}
// calc mode is spline but the attribute is not set
if (!HasAttr(nsGkAtoms::keySplines)) {
SetKeySplinesErrorFlag(PR_FALSE);
return;
}
if (mKeySplines.Length() < 1) {
// keyTimes isn't set or failed preliminary checks
SetKeySplinesErrorFlag(PR_TRUE);
return;
}
// ignore splines if there's only one value
if (aNumValues == 1 && !IsToAnimation()) {
SetKeySplinesErrorFlag(PR_FALSE);
return;
}
// no. keySpline specs == no. values - 1
PRUint32 splineSpecs = mKeySplines.Length();
if ((splineSpecs != aNumValues - 1 && !IsToAnimation()) ||
(IsToAnimation() && splineSpecs != 1)) {
SetKeySplinesErrorFlag(PR_TRUE);
return;
}
SetKeySplinesErrorFlag(PR_FALSE);
}
//----------------------------------------------------------------------
// Property getters
PRBool
nsSMILAnimationFunction::GetAccumulate() const
{
const nsAttrValue* value = GetAttr(nsGkAtoms::accumulate);
if (!value)
return PR_FALSE;
return value->GetEnumValue();
}
PRBool
nsSMILAnimationFunction::GetAdditive() const
{
const nsAttrValue* value = GetAttr(nsGkAtoms::additive);
if (!value)
return PR_FALSE;
return value->GetEnumValue();
}
nsSMILAnimationFunction::nsSMILCalcMode
nsSMILAnimationFunction::GetCalcMode() const
{
const nsAttrValue* value = GetAttr(nsGkAtoms::calcMode);
if (!value)
return CALC_LINEAR;
return nsSMILCalcMode(value->GetEnumValue());
}
//----------------------------------------------------------------------
// Property setters / un-setters:
nsresult
nsSMILAnimationFunction::SetAccumulate(const nsAString& aAccumulate,
nsAttrValue& aResult)
{
mHasChanged = PR_TRUE;
PRBool parseResult =
aResult.ParseEnumValue(aAccumulate, sAccumulateTable, PR_TRUE);
SetAccumulateErrorFlag(!parseResult);
return parseResult ? NS_OK : NS_ERROR_FAILURE;
}
void
nsSMILAnimationFunction::UnsetAccumulate()
{
SetAccumulateErrorFlag(PR_FALSE);
mHasChanged = PR_TRUE;
}
nsresult
nsSMILAnimationFunction::SetAdditive(const nsAString& aAdditive,
nsAttrValue& aResult)
{
mHasChanged = PR_TRUE;
PRBool parseResult
= aResult.ParseEnumValue(aAdditive, sAdditiveTable, PR_TRUE);
SetAdditiveErrorFlag(!parseResult);
return parseResult ? NS_OK : NS_ERROR_FAILURE;
}
void
nsSMILAnimationFunction::UnsetAdditive()
{
SetAdditiveErrorFlag(PR_FALSE);
mHasChanged = PR_TRUE;
}
nsresult
nsSMILAnimationFunction::SetCalcMode(const nsAString& aCalcMode,
nsAttrValue& aResult)
{
mHasChanged = PR_TRUE;
PRBool parseResult
= aResult.ParseEnumValue(aCalcMode, sCalcModeTable, PR_TRUE);
SetCalcModeErrorFlag(!parseResult);
return parseResult ? NS_OK : NS_ERROR_FAILURE;
}
void
nsSMILAnimationFunction::UnsetCalcMode()
{
SetCalcModeErrorFlag(PR_FALSE);
mHasChanged = PR_TRUE;
}
nsresult
nsSMILAnimationFunction::SetKeySplines(const nsAString& aKeySplines,
nsAttrValue& aResult)
{
mKeySplines.Clear();
aResult.SetTo(aKeySplines);
nsTArray<double> keySplines;
nsresult rv = nsSMILParserUtils::ParseKeySplines(aKeySplines, keySplines);
if (keySplines.Length() < 1 || keySplines.Length() % 4)
rv = NS_ERROR_FAILURE;
if (NS_SUCCEEDED(rv))
{
mKeySplines.SetCapacity(keySplines.Length() % 4);
for (PRUint32 i = 0; i < keySplines.Length() && NS_SUCCEEDED(rv); i += 4)
{
if (!mKeySplines.AppendElement(nsSMILKeySpline(keySplines[i],
keySplines[i+1],
keySplines[i+2],
keySplines[i+3]))) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
}
}
mHasChanged = PR_TRUE;
return rv;
}
void
nsSMILAnimationFunction::UnsetKeySplines()
{
mKeySplines.Clear();
SetKeySplinesErrorFlag(PR_FALSE);
mHasChanged = PR_TRUE;
}
nsresult
nsSMILAnimationFunction::SetKeyTimes(const nsAString& aKeyTimes,
nsAttrValue& aResult)
{
mKeyTimes.Clear();
aResult.SetTo(aKeyTimes);
nsresult rv =
nsSMILParserUtils::ParseSemicolonDelimitedProgressList(aKeyTimes, PR_TRUE,
mKeyTimes);
if (NS_SUCCEEDED(rv) && mKeyTimes.Length() < 1)
rv = NS_ERROR_FAILURE;
if (NS_FAILED(rv))
mKeyTimes.Clear();
mHasChanged = PR_TRUE;
return NS_OK;
}
void
nsSMILAnimationFunction::UnsetKeyTimes()
{
mKeyTimes.Clear();
SetKeyTimesErrorFlag(PR_FALSE);
mHasChanged = PR_TRUE;
}
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