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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 {
namespace {
// Input scenarios order is fixed, see the InputScenario enum comments.
// The one with a higher numeric value always has priority.
size_t GetActiveProcessInputScenario(
const std::array<size_t, static_cast<size_t>(InputScenario::kMax) + 1>&
input_counts) {
size_t largest_non_zero_index = input_counts.size() - 1;
while (largest_non_zero_index > 0 &&
input_counts.at(largest_non_zero_index) == 0) {
--largest_non_zero_index;
}
return largest_non_zero_index;
}
size_t GetActiveGlobalInputScenario(
const std::map<
const ProcessNode*,
std::array<size_t, static_cast<size_t>(InputScenario::kMax) + 1>>&
process_input_counts) {
size_t largest_index = 0;
for (const auto& [unused_k, input_counts] : process_input_counts) {
largest_index =
std::max(largest_index, GetActiveProcessInputScenario(input_counts));
}
return largest_index;
}
} // namespace
InputScenarioObserver::InputScenarioObserver() = default;
InputScenarioObserver::~InputScenarioObserver() = default;
void InputScenarioObserver::OnInputScenarioChanged(
const FrameNode* frame_node,
InputScenario previous_scenario) {
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();
auto& process_input_counts = process_input_scenarios_count_[process_node];
const size_t previous_process_scenario_index =
GetActiveProcessInputScenario(process_input_counts);
const size_t previous_global_scenario_index =
GetActiveGlobalInputScenario(process_input_scenarios_count_);
if (previous_scenario != InputScenario::kNoInput) {
const size_t scenario_index = static_cast<size_t>(previous_scenario);
CHECK_GT(process_input_counts.at(scenario_index), 0u);
--process_input_counts.at(scenario_index);
}
if (data->input_scenario() != InputScenario::kNoInput) {
const size_t scenario_index = static_cast<size_t>(data->input_scenario());
++process_input_counts.at(scenario_index);
}
const size_t process_scenario_index =
GetActiveProcessInputScenario(process_input_counts);
const size_t global_scenario_index =
GetActiveGlobalInputScenario(process_input_scenarios_count_);
if (process_scenario_index != previous_process_scenario_index) {
SetInputScenarioForProcessNode(
static_cast<InputScenario>(process_scenario_index), process_node);
}
if (global_scenario_index != previous_global_scenario_index) {
SetGlobalInputScenario(static_cast<InputScenario>(global_scenario_index));
}
}
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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