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// Copyright 2017 The Chromium Authors
// 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 "base/timer/lap_timer.h"
#include "testing/perf/perf_result_reporter.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.
std::u16string string1 = u"boring ascii string";
std::u16string string2 = u"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.
base::LapTimer timer(kWarmupLaps, base::TimeDelta(), kLaps);
for (int i = 0; i < kLaps + kWarmupLaps; ++i) {
label.SetText(i % 2 == 0 ? string1 : string2);
label.GetPreferredSize({});
timer.NextLap();
}
perf_test::PerfResultReporter reporter("LabelPerfTest", "GetPreferredSize");
reporter.RegisterImportantMetric("", "runs/s");
reporter.AddResult("", timer.LapsPerSecond());
}
} // namespace views
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