blob: bd0094dfb6a3648d8c6a17cc85b1c31fa84782c8 [file] [log] [blame]
// Copyright 2017 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 "ui/views/controls/label.h"
#include "base/strings/utf_string_conversions.h"
#include "cc/base/lap_timer.h"
#include "testing/perf/perf_test.h"
#include "ui/views/test/views_test_base.h"
namespace views {
using LabelPerfTest = ViewsTestBase;
// Test the number of text size measurements that can be made made per second.
// This should surface any performance regressions in underlying text layout
// system, e.g., failure to cache font structures.
TEST_F(LabelPerfTest, GetPreferredSize) {
Label label;
// Alternate between two strings to ensure caches are cleared.
base::string16 string1 = base::ASCIIToUTF16("boring ascii string");
base::string16 string2 = base::ASCIIToUTF16("another uninteresting sequence");
constexpr int kLaps = 5000; // Aim to run in under 3 seconds.
constexpr int kWarmupLaps = 5;
// The time limit is unused. Use kLaps for the check interval so the time is
// only measured once.
cc::LapTimer timer(kWarmupLaps, base::TimeDelta(), kLaps);
for (int i = 0; i < kLaps + kWarmupLaps; ++i) {
label.SetText(i % 2 == 0 ? string1 : string2);
perf_test::PrintResult("LabelPerfTest", std::string(), "GetPreferredSize",
timer.LapsPerSecond(), "runs/s", true);
} // namespace views