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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/scenarios/input_scenario_observer.h"
#include "base/check.h"
namespace performance_manager {
InputScenarioObserver::InputScenarioObserver() = default;
InputScenarioObserver::~InputScenarioObserver() = default;
void InputScenarioObserver::OnInputScenarioChanged(
const FrameNode* frame_node) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
auto* data = FrameInputStateDecorator::Data::Get(frame_node);
CHECK(data, base::NotFatalUntil::M136);
const ProcessNode* process_node = frame_node->GetProcessNode();
size_t& process_input_count = process_input_scenarios_count_[process_node];
if (data->input_scenario() == InputScenario::kNoInput) {
CHECK_GT(process_input_count, 0u);
CHECK_GT(global_input_scenarios_count_, 0u);
process_input_count -= 1;
global_input_scenarios_count_ -= 1;
if (process_input_count == 0) {
SetInputScenarioForProcessNode(InputScenario::kNoInput, process_node);
}
if (global_input_scenarios_count_ == 0) {
SetGlobalInputScenario(InputScenario::kNoInput);
}
} else {
process_input_count += 1;
global_input_scenarios_count_ += 1;
if (process_input_count == 1) {
SetInputScenarioForProcessNode(data->input_scenario(), process_node);
}
if (global_input_scenarios_count_ == 1) {
SetGlobalInputScenario(data->input_scenario());
}
}
}
void InputScenarioObserver::OnPassedToGraph(Graph* graph) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
FrameInputStateDecorator* frame_input_state_decorator =
FrameInputStateDecorator::GetFromGraph(graph);
CHECK(frame_input_state_decorator);
frame_input_state_decorator->AddObserver(this);
graph->AddProcessNodeObserver(this);
}
void InputScenarioObserver::OnTakenFromGraph(Graph* graph) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
FrameInputStateDecorator* frame_input_state_decorator =
FrameInputStateDecorator::GetFromGraph(graph);
if (frame_input_state_decorator) {
frame_input_state_decorator->RemoveObserver(this);
}
graph->RemoveProcessNodeObserver(this);
}
void InputScenarioObserver::OnBeforeProcessNodeRemoved(
const ProcessNode* process_node) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
process_input_scenarios_count_.erase(process_node);
}
} // namespace performance_manager
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