void
nsSMILCompositor::ComposeAttribute(bool& aMightHavePendingStyleUpdates)
{
if (!mKey.mElement)
return;
// FIRST: Get the nsISMILAttr (to grab base value from, and to eventually
// give animated value to)
nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
if (!smilAttr) {
// Target attribute not found (or, out of memory)
return;
}
if (mAnimationFunctions.IsEmpty()) {
// No active animation functions. (We can still have a nsSMILCompositor in
// that case if an animation function has *just* become inactive)
smilAttr->ClearAnimValue();
// Removing the animation effect may require a style update.
aMightHavePendingStyleUpdates = true;
return;
}
// SECOND: Sort the animationFunctions, to prepare for compositing.
nsSMILAnimationFunction::Comparator comparator;
mAnimationFunctions.Sort(comparator);
// THIRD: Step backwards through animation functions to find out
// which ones we actually care about.
uint32_t firstFuncToCompose = GetFirstFuncToAffectSandwich();
// FOURTH: Get & cache base value
nsSMILValue sandwichResultValue;
if (!mAnimationFunctions[firstFuncToCompose]->WillReplace()) {
sandwichResultValue = smilAttr->GetBaseValue();
}
UpdateCachedBaseValue(sandwichResultValue);
if (!mForceCompositing) {
return;
}
// FIFTH: Compose animation functions
aMightHavePendingStyleUpdates = true;
uint32_t length = mAnimationFunctions.Length();
for (uint32_t i = firstFuncToCompose; i < length; ++i) {
mAnimationFunctions[i]->ComposeResult(*smilAttr, sandwichResultValue);
}
if (sandwichResultValue.IsNull()) {
smilAttr->ClearAnimValue();
return;
}
// SIXTH: Set the animated value to the final composited result.
nsresult rv = smilAttr->SetAnimValue(sandwichResultValue);
if (NS_FAILED(rv)) {
NS_WARNING("nsISMILAttr::SetAnimValue failed");
}
}
void
nsSMILCompositor::ClearAnimationEffects()
{
if (!mKey.mElement || !mKey.mAttributeName)
return;
nsAutoPtr<nsISMILAttr> smilAttr(CreateSMILAttr());
if (!smilAttr) {
// Target attribute not found (or, out of memory)
return;
}
smilAttr->ClearAnimValue();
}
