bool CompositorAnimations::getAnimatedBoundingBox(FloatBox& box, const AnimationEffect& effect, double minValue, double maxValue) const
{
const KeyframeEffectModelBase& keyframeEffect = toKeyframeEffectModelBase(effect);
PropertySet properties = keyframeEffect.properties();
if (properties.isEmpty())
return true;
minValue = std::min(minValue, 0.0);
maxValue = std::max(maxValue, 1.0);
for (const auto& property : properties) {
// TODO: Add the ability to get expanded bounds for filters as well.
if (property != CSSPropertyTransform && property != CSSPropertyWebkitTransform)
continue;
const PropertySpecificKeyframeVector& frames = keyframeEffect.getPropertySpecificKeyframes(property);
if (frames.isEmpty() || frames.size() < 2)
continue;
FloatBox originalBox(box);
for (size_t j = 0; j < frames.size() - 1; ++j) {
const AnimatableTransform* startTransform = toAnimatableTransform(frames[j]->getAnimatableValue().get());
const AnimatableTransform* endTransform = toAnimatableTransform(frames[j+1]->getAnimatableValue().get());
if (!startTransform || !endTransform)
return false;
// TODO: Add support for inflating modes other than Replace.
if (frames[j]->composite() != AnimationEffect::CompositeReplace)
return false;
const TimingFunction& timing = frames[j]->easing();
double min = 0;
double max = 1;
if (j == 0) {
float frameLength = frames[j+1]->offset();
if (frameLength > 0) {
min = minValue / frameLength;
}
}
if (j == frames.size() - 2) {
float frameLength = frames[j+1]->offset() - frames[j]->offset();
if (frameLength > 0) {
max = 1 + (maxValue - 1) / frameLength;
}
}
FloatBox bounds;
timing.range(&min, &max);
if (!endTransform->transformOperations().blendedBoundsForBox(originalBox, startTransform->transformOperations(), min, max, &bounds))
return false;
box.expandTo(bounds);
}
}
return true;
}
bool AnimationStack::getAnimatedBoundingBox(FloatBox& box, CSSPropertyID property) const
{
FloatBox originalBox(box);
for (const auto& sampledEffect : m_effects) {
if (sampledEffect->effect() && sampledEffect->effect()->affects(PropertyHandle(property))) {
KeyframeEffect* effect = sampledEffect->effect();
const Timing& timing = effect->specifiedTiming();
double startRange = 0;
double endRange = 1;
timing.timingFunction->range(&startRange, &endRange);
FloatBox expandingBox(originalBox);
if (!CompositorAnimations::instance()->getAnimatedBoundingBox(expandingBox, *effect->model(), startRange, endRange))
return false;
box.expandTo(expandingBox);
}
}
return true;
}
