gecko/content/smil/nsSMILSetAnimationFunction.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * The contents of this file are subject to the Mozilla Public License Version
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 * 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) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Brian Birtles <birtles@gmail.com>
 *
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 * 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"),
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#include "nsSMILSetAnimationFunction.h"

inline PRBool
nsSMILSetAnimationFunction::IsDisallowedAttribute(
    const nsIAtom* aAttribute) const
{
  //
  // A <set> element is similar to <animate> but lacks:
  //   AnimationValue.attrib(calcMode, values, keyTimes, keySplines, from, to,
  //                         by) -- BUT has 'to'
  //   AnimationAddition.attrib(additive, accumulate)
  //
  if (aAttribute == nsGkAtoms::calcMode ||
      aAttribute == nsGkAtoms::values ||
      aAttribute == nsGkAtoms::keyTimes ||
      aAttribute == nsGkAtoms::keySplines ||
      aAttribute == nsGkAtoms::from ||
      aAttribute == nsGkAtoms::by ||
      aAttribute == nsGkAtoms::additive ||
      aAttribute == nsGkAtoms::accumulate) {
    return PR_TRUE;
  }

  return PR_FALSE;
}

PRBool
nsSMILSetAnimationFunction::SetAttr(nsIAtom* aAttribute,
                                    const nsAString& aValue,
                                    nsAttrValue& aResult,
                                    nsresult* aParseResult)
{
  if (IsDisallowedAttribute(aAttribute)) {
    aResult.SetTo(aValue);
    if (aParseResult) {
      // SMILANIM 4.2 says:
      //
      //   The additive and accumulate attributes are not allowed, and will be
      //   ignored if specified.
      //
      // So at least for those two attributes we shouldn't report an error even
      // if they're present. For now we'll also just silently ignore other
      // attribute types too.
      *aParseResult = NS_OK;
    }
    return PR_TRUE;
  }

  return nsSMILAnimationFunction::SetAttr(aAttribute, aValue,
                                          aResult, aParseResult);
}

PRBool
nsSMILSetAnimationFunction::UnsetAttr(nsIAtom* aAttribute)
{
  if (IsDisallowedAttribute(aAttribute)) {
    return PR_TRUE;
  }

  return nsSMILAnimationFunction::UnsetAttr(aAttribute);
}

nsresult
nsSMILSetAnimationFunction::InterpolateResult(const nsSMILValueArray& aValues,
                                              nsSMILValue& aResult,
                                              nsSMILValue& aBaseValue)
{
  // Sanity Checks
  const nsSMILTime& dur = mSimpleDuration.GetMillis();
  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");
  NS_ABORT_IF_FALSE(IsToAnimation(), "Set element only supports to-animation");

  if (mSampleTime >= dur || mSampleTime < 0) {
    NS_ERROR("Animation sampled outside interval");
    return NS_ERROR_FAILURE;
  }
  if (aValues.Length() != 1) {
    NS_ERROR("Unexpected number of values");
    return NS_ERROR_FAILURE;
  }
  // End Sanity Checks

  // Always use the 'to' value (which should be first & only elem in |aValues|)
  aResult = aValues[0];
  return NS_OK;
}

PRBool
nsSMILSetAnimationFunction::HasAttr(nsIAtom* aAttName) const
{
  if (IsDisallowedAttribute(aAttName))
    return PR_FALSE;

  return nsSMILAnimationFunction::HasAttr(aAttName);
}

const nsAttrValue*
nsSMILSetAnimationFunction::GetAttr(nsIAtom* aAttName) const
{
  if (IsDisallowedAttribute(aAttName))
    return nsnull;

  return nsSMILAnimationFunction::GetAttr(aAttName);
}

PRBool
nsSMILSetAnimationFunction::GetAttr(nsIAtom* aAttName,
                                    nsAString& aResult) const
{
  if (IsDisallowedAttribute(aAttName))
    return nsnull;

  return nsSMILAnimationFunction::GetAttr(aAttName, aResult);
}