chromium/cc/metrics/lcd_text_metrics_reporter.cc

// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/metrics/lcd_text_metrics_reporter.h"

#include "base/functional/function_ref.h"
#include "base/lazy_instance.h"
#include "base/memory/ptr_util.h"
#include "base/metrics/histogram_macros.h"
#include "base/numerics/safe_conversions.h"
#include "base/trace_event/trace_event.h"
#include "cc/base/histograms.h"
#include "cc/layers/picture_layer_impl.h"
#include "cc/paint/display_item_list.h"
#include "cc/trees/layer_tree_host_impl.h"
#include "cc/trees/layer_tree_impl.h"

namespace cc {

namespace {

constexpr auto kMinimumTimeInterval = …;
constexpr unsigned kMinimumFrameInterval = …;

// This must be the same as that used in DeviceScaleEnsuresTextQuality() in
// content/renderer/render_widget.cc.
constexpr float kHighDPIDeviceScaleFactorThreshold = …;
constexpr char kMetricNameLCDTextKPixelsHighDPI[] = …;
constexpr char kMetricNameLCDTextKPixelsLowDPI[] = …;
constexpr char kMetricNameLCDTextLayersHighDPI[] = …;
constexpr char kMetricNameLCDTextLayersLowDPI[] = …;

void Report(const LayerTreeImpl* layer_tree,
            base::FunctionRef<void(int64_t text_pixels,
                                   LCDTextDisallowedReason)> report_layer) { … }

constexpr char const* kTraceCategory = …);

}  // anonymous namespace

std::unique_ptr<LCDTextMetricsReporter> LCDTextMetricsReporter::CreateIfNeeded(
    const LayerTreeHostImpl* layer_tree_host_impl) { … }

LCDTextMetricsReporter::LCDTextMetricsReporter(
    const LayerTreeHostImpl* layer_tree_host_impl)
    : … { … }

LCDTextMetricsReporter::~LCDTextMetricsReporter() = default;

void LCDTextMetricsReporter::NotifySubmitFrame(
    const viz::BeginFrameArgs& args) { … }

void LCDTextMetricsReporter::NotifyPauseFrameProduction() { … }

}  // namespace cc