src/animation/animation_state_instance.cpp

#include "rive/animation/animation_state_instance.hpp"
#include "rive/animation/animation_state.hpp"
#include "rive/animation/state_machine_instance.hpp"

using namespace rive;

static LinearAnimation emptyAnimation;

AnimationStateInstance::AnimationStateInstance(const AnimationState* state,
                                               ArtboardInstance* instance) :
    StateInstance(state),
    // We're careful to always instance a valid animation here as the
    // StateMachine makes assumptions about AnimationState's producing valid
    // AnimationStateInstances with backing animations. This was discovered when
    // using Clang address sanitizer. We previously returned a
    // SystemStateInstance (basically a no-op StateMachine state) which would
    // cause bad casts in parts of the code where we assumed AnimationStates
    // would have create AnimationStateInstances.
    m_AnimationInstance(state->animation() ? state->animation()
                                           : &emptyAnimation,
                        instance,
                        state->speed()),
    m_KeepGoing(true)
{}

// NOTE:: should we return bool here? we are not currently using the output of
// this, we are instead using m_keepGoing directly.
void AnimationStateInstance::advance(float seconds,
                                     StateMachineInstance* stateMachineInstance)
{
    m_KeepGoing = m_AnimationInstance.advance(
        seconds * state()->as<AnimationState>()->speed(),
        stateMachineInstance);
}

void AnimationStateInstance::apply(ArtboardInstance* instance, float mix)
{
    m_AnimationInstance.apply(mix);
}

bool AnimationStateInstance::keepGoing() const { return m_KeepGoing; }
void AnimationStateInstance::clearSpilledTime()
{
    m_AnimationInstance.clearSpilledTime();
}