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// 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 "third_party/blink/renderer/platform/widget/input/input_metrics.h"
#include "base/feature_list.h"
#include "base/metrics/histogram_macros.h"
#include "cc/base/features.h"
#include "cc/input/main_thread_scrolling_reason.h"
#include "third_party/blink/public/common/input/web_gesture_device.h"
namespace blink {
namespace {
constexpr uint32_t kMax =
cc::MainThreadScrollingReason::kMainThreadScrollingReasonLast;
static void RecordOneScrollReasonMetric(WebGestureDevice device,
uint32_t reason_index) {
if (device == WebGestureDevice::kTouchscreen) {
UMA_HISTOGRAM_EXACT_LINEAR("Renderer4.MainThreadGestureScrollReason2",
reason_index, kMax + 1);
} else {
UMA_HISTOGRAM_EXACT_LINEAR("Renderer4.MainThreadWheelScrollReason2",
reason_index, kMax + 1);
}
}
} // anonymous namespace
void RecordScrollReasonsMetric(WebGestureDevice device, uint32_t reasons) {
if (reasons == cc::MainThreadScrollingReason::kNotScrollingOnMain) {
// Record the histogram for non-main-thread scrolls.
RecordOneScrollReasonMetric(
device, cc::MainThreadScrollingReason::kNotScrollingOnMain);
return;
}
// Record the histogram for main-thread scrolls for any reason.
RecordOneScrollReasonMetric(
device, cc::MainThreadScrollingReason::kScrollingOnMainForAnyReason);
// The enum in cc::MainThreadScrollingReason simultaneously defines actual
// bitmask values and indices into the bitmask, but kNotScrollingMain and
// kScrollingOnMainForAnyReason are recorded in the histograms, so these
// bits should never be used.
DCHECK(
!(reasons & (1 << cc::MainThreadScrollingReason::kNotScrollingOnMain)));
DCHECK(!(reasons &
(1 << cc::MainThreadScrollingReason::kScrollingOnMainForAnyReason)));
// Record histograms for individual main-thread scrolling reasons.
for (uint32_t i =
cc::MainThreadScrollingReason::kScrollingOnMainForAnyReason + 1;
i <= kMax; ++i) {
if (reasons & (1 << i))
RecordOneScrollReasonMetric(device, i);
}
}
} // namespace blink
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