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// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/animation/animation.h"
#include <cmath>
#include "base/debug/trace_event.h"
#include "base/strings/string_util.h"
#include "cc/animation/animation_curve.h"
namespace {
// This should match the RunState enum.
static const char* const s_runStateNames[] = {
"WaitingForTargetAvailability",
"WaitingForDeletion",
"Starting",
"Running",
"Paused",
"Finished",
"Aborted"
};
COMPILE_ASSERT(static_cast<int>(cc::Animation::RunStateEnumSize) ==
arraysize(s_runStateNames),
RunState_names_match_enum);
// This should match the TargetProperty enum.
static const char* const s_targetPropertyNames[] = {
"Transform",
"Opacity",
"Filter",
"ScrollOffset",
"BackgroundColor"
};
COMPILE_ASSERT(static_cast<int>(cc::Animation::TargetPropertyEnumSize) ==
arraysize(s_targetPropertyNames),
TargetProperty_names_match_enum);
} // namespace
namespace cc {
scoped_ptr<Animation> Animation::Create(
scoped_ptr<AnimationCurve> curve,
int animation_id,
int group_id,
TargetProperty target_property) {
return make_scoped_ptr(new Animation(curve.Pass(),
animation_id,
group_id,
target_property)); }
Animation::Animation(scoped_ptr<AnimationCurve> curve,
int animation_id,
int group_id,
TargetProperty target_property)
: curve_(curve.Pass()),
id_(animation_id),
group_(group_id),
target_property_(target_property),
run_state_(WaitingForTargetAvailability),
iterations_(1),
direction_(Normal),
needs_synchronized_start_time_(false),
received_finished_event_(false),
suspended_(false),
is_controlling_instance_(false),
is_impl_only_(false),
affects_active_observers_(true),
affects_pending_observers_(true) {
}
Animation::~Animation() {
if (run_state_ == Running || run_state_ == Paused)
SetRunState(Aborted, base::TimeTicks());
}
void Animation::SetRunState(RunState run_state,
base::TimeTicks monotonic_time) {
if (suspended_)
return;
char name_buffer[256];
base::snprintf(name_buffer,
sizeof(name_buffer),
"%s-%d%s",
s_targetPropertyNames[target_property_],
group_,
is_controlling_instance_ ? "(impl)" : "");
bool is_waiting_to_start = run_state_ == WaitingForTargetAvailability ||
run_state_ == Starting;
if (is_waiting_to_start && run_state == Running) {
TRACE_EVENT_ASYNC_BEGIN1(
"cc", "Animation", this, "Name", TRACE_STR_COPY(name_buffer));
}
bool was_finished = is_finished();
const char* old_run_state_name = s_runStateNames[run_state_];
if (run_state == Running && run_state_ == Paused)
total_paused_time_ += (monotonic_time - pause_time_);
else if (run_state == Paused)
pause_time_ = monotonic_time;
run_state_ = run_state;
const char* new_run_state_name = s_runStateNames[run_state];
if (!was_finished && is_finished())
TRACE_EVENT_ASYNC_END0("cc", "Animation", this);
char state_buffer[256];
base::snprintf(state_buffer,
sizeof(state_buffer),
"%s->%s",
old_run_state_name,
new_run_state_name);
TRACE_EVENT_INSTANT2("cc",
"LayerAnimationController::SetRunState",
TRACE_EVENT_SCOPE_THREAD,
"Name",
TRACE_STR_COPY(name_buffer),
"State",
TRACE_STR_COPY(state_buffer));
}
void Animation::Suspend(base::TimeTicks monotonic_time) {
SetRunState(Paused, monotonic_time);
suspended_ = true;
}
void Animation::Resume(base::TimeTicks monotonic_time) {
suspended_ = false;
SetRunState(Running, monotonic_time);
}
bool Animation::IsFinishedAt(base::TimeTicks monotonic_time) const {
if (is_finished())
return true;
if (needs_synchronized_start_time_)
return false;
return run_state_ == Running && iterations_ >= 0 &&
iterations_ * curve_->Duration() <=
(monotonic_time + time_offset_ - start_time_ - total_paused_time_)
.InSecondsF();
}
double Animation::TrimTimeToCurrentIteration(
base::TimeTicks monotonic_time) const {
base::TimeTicks trimmed = monotonic_time + time_offset_;
// If we're paused, time is 'stuck' at the pause time.
if (run_state_ == Paused)
trimmed = pause_time_;
// Returned time should always be relative to the start time and should
// subtract all time spent paused.
trimmed -= (start_time_ - base::TimeTicks()) + total_paused_time_;
// If we're just starting or we're waiting on receiving a start time,
// time is 'stuck' at the initial state.
if ((run_state_ == Starting && !has_set_start_time()) ||
needs_synchronized_start_time())
trimmed = base::TimeTicks() + time_offset_;
double trimmed_in_seconds = (trimmed - base::TimeTicks()).InSecondsF();
// Return 0 if we are before the start of the animation
if (trimmed_in_seconds < 0)
return 0;
// Always return zero if we have no iterations.
if (!iterations_)
return 0;
// Don't attempt to trim if we have no duration.
if (curve_->Duration() <= 0)
return 0;
// check if we are past active interval
bool is_past_total_duration =
(iterations_ > 0 &&
trimmed_in_seconds >= curve_->Duration() * iterations_);
// We need to know the current iteration if we're alternating.
int iteration = 0;
// If we are past the active interval, return iteration duration.
if (is_past_total_duration) {
iteration = iterations_ - 1;
trimmed_in_seconds = curve_->Duration();
} else {
iteration = static_cast<int>(trimmed_in_seconds / curve_->Duration());
// Calculate x where trimmed = x + n * curve_->Duration() for some positive
// integer n.
trimmed_in_seconds = fmod(trimmed_in_seconds, curve_->Duration());
}
// check if we are running the animation in reverse direction for the current
// iteration
bool reverse = (direction_ == Reverse) ||
(direction_ == Alternate && iteration % 2 == 1) ||
(direction_ == AlternateReverse && iteration % 2 == 0);
// if we are running the animation in reverse direction, reverse the result
if (reverse)
return curve_->Duration() - trimmed_in_seconds;
return trimmed_in_seconds;
}
scoped_ptr<Animation> Animation::CloneAndInitialize(
RunState initial_run_state) const {
scoped_ptr<Animation> to_return(
new Animation(curve_->Clone(), id_, group_, target_property_));
to_return->run_state_ = initial_run_state;
to_return->iterations_ = iterations_;
to_return->start_time_ = start_time_;
to_return->pause_time_ = pause_time_;
to_return->total_paused_time_ = total_paused_time_;
to_return->time_offset_ = time_offset_;
to_return->direction_ = direction_;
DCHECK(!to_return->is_controlling_instance_);
to_return->is_controlling_instance_ = true;
return to_return.Pass();
}
void Animation::PushPropertiesTo(Animation* other) const {
// Currently, we only push changes due to pausing and resuming animations on
// the main thread.
if (run_state_ == Animation::Paused ||
other->run_state_ == Animation::Paused) {
other->run_state_ = run_state_;
other->pause_time_ = pause_time_;
other->total_paused_time_ = total_paused_time_;
}
}
} // namespace cc
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