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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/base/l10n/l10n_util_win.h"
      6 
      7 #include <windows.h>
      8 
      9 #include "base/win/win_util.h"
     10 #include "testing/gtest/include/gtest/gtest.h"
     11 #include "testing/platform_test.h"
     12 #include "ui/gfx/win/dpi.h"
     13 
     14 typedef PlatformTest L10nUtilWinTest;
     15 
     16 TEST_F(L10nUtilWinTest, TestDPIScaling) {
     17   // Baseline font for comparison.
     18   NONCLIENTMETRICS metrics;
     19   base::win::GetNonClientMetrics(&metrics);
     20   LOGFONT lf = metrics.lfMessageFont;
     21   l10n_util::AdjustUIFont(&lf);
     22   int size = lf.lfHeight;
     23   float rounding = size < 0 ? -0.5f : 0.5f;
     24 
     25   // Test that font size is properly normalized for DIP. In high-DPI mode, the
     26   // font metrics are scaled based on the DPI scale factor. For Windows 8, 140%
     27   // and 180% font scaling are supported. Simulate size normalization for a DPI-
     28   // aware process by manually scaling up the font and checking that it returns
     29   // to the expected size.
     30   lf.lfHeight = static_cast<int>(1.4 * size + rounding);
     31   l10n_util::AdjustUIFontForDIP(1.4f, &lf);
     32   EXPECT_NEAR(size, lf.lfHeight, 1);
     33 
     34   lf.lfHeight = static_cast<int>(1.8 * size + rounding);
     35   l10n_util::AdjustUIFontForDIP(1.8f, &lf);
     36   EXPECT_NEAR(size, lf.lfHeight, 1);
     37 }