1 // Copyright (c) 2012 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/gfx/platform_font_win.h"
6
7 #include "base/logging.h"
8 #include "base/memory/ref_counted.h"
9 #include "testing/gtest/include/gtest/gtest.h"
10 #include "ui/gfx/font.h"
11
12 namespace gfx {
13
14 namespace {
15
16 // Returns a font based on |base_font| with height at most |target_height| and
17 // font size maximized. Returns |base_font| if height is already equal.
AdjustFontSizeForHeight(const gfx::Font & base_font,int target_height)18 gfx::Font AdjustFontSizeForHeight(const gfx::Font& base_font,
19 int target_height) {
20 Font expected_font = base_font;
21 if (base_font.GetHeight() < target_height) {
22 // Increase size while height is <= |target_height|.
23 Font larger_font = base_font.DeriveFont(1, 0);
24 while (larger_font.GetHeight() <= target_height) {
25 expected_font = larger_font;
26 larger_font = larger_font.DeriveFont(1, 0);
27 }
28 } else if (expected_font.GetHeight() > target_height) {
29 // Decrease size until height is <= |target_height|.
30 do {
31 expected_font = expected_font.DeriveFont(-1, 0);
32 } while (expected_font.GetHeight() > target_height);
33 }
34 return expected_font;
35 }
36
37 } // namespace
38
TEST(PlatformFontWinTest,DeriveFontWithHeight)39 TEST(PlatformFontWinTest, DeriveFontWithHeight) {
40 const Font base_font;
41 PlatformFontWin* platform_font =
42 static_cast<PlatformFontWin*>(base_font.platform_font());
43
44 for (int i = -10; i < 10; i++) {
45 const int target_height = base_font.GetHeight() + i;
46 Font expected_font = AdjustFontSizeForHeight(base_font, target_height);
47 ASSERT_LE(expected_font.GetHeight(), target_height);
48
49 Font derived_font = platform_font->DeriveFontWithHeight(target_height, 0);
50 EXPECT_EQ(expected_font.GetFontName(), derived_font.GetFontName());
51 EXPECT_EQ(expected_font.GetFontSize(), derived_font.GetFontSize());
52 EXPECT_LE(expected_font.GetHeight(), target_height);
53 EXPECT_EQ(0, derived_font.GetStyle());
54
55 derived_font = platform_font->DeriveFontWithHeight(target_height,
56 Font::BOLD);
57 EXPECT_EQ(expected_font.GetFontName(), derived_font.GetFontName());
58 EXPECT_EQ(expected_font.GetFontSize(), derived_font.GetFontSize());
59 EXPECT_LE(expected_font.GetHeight(), target_height);
60 EXPECT_EQ(Font::BOLD, derived_font.GetStyle());
61
62 // Test that deriving from the new font has the expected result.
63 Font rederived_font = derived_font.DeriveFont(1, 0);
64 expected_font = Font(derived_font.GetFontName(),
65 derived_font.GetFontSize() + 1);
66 EXPECT_EQ(expected_font.GetFontName(), rederived_font.GetFontName());
67 EXPECT_EQ(expected_font.GetFontSize(), rederived_font.GetFontSize());
68 EXPECT_EQ(expected_font.GetHeight(), rederived_font.GetHeight());
69 }
70 }
71
72 // Callback function used by DeriveFontWithHeight_MinSize() below.
GetMinFontSize()73 static int GetMinFontSize() {
74 return 10;
75 }
76
TEST(PlatformFontWinTest,DeriveFontWithHeight_MinSize)77 TEST(PlatformFontWinTest, DeriveFontWithHeight_MinSize) {
78 PlatformFontWin::GetMinimumFontSizeCallback old_callback =
79 PlatformFontWin::get_minimum_font_size_callback;
80 PlatformFontWin::get_minimum_font_size_callback = &GetMinFontSize;
81
82 const Font base_font;
83 const Font min_font(base_font.GetFontName(), GetMinFontSize());
84 PlatformFontWin* platform_font =
85 static_cast<PlatformFontWin*>(base_font.platform_font());
86
87 const Font derived_font =
88 platform_font->DeriveFontWithHeight(min_font.GetHeight() - 1, 0);
89 EXPECT_EQ(min_font.GetFontSize(), derived_font.GetFontSize());
90 EXPECT_EQ(min_font.GetHeight(), derived_font.GetHeight());
91
92 PlatformFontWin::get_minimum_font_size_callback = old_callback;
93 }
94
TEST(PlatformFontWinTest,DeriveFontWithHeight_TooSmall)95 TEST(PlatformFontWinTest, DeriveFontWithHeight_TooSmall) {
96 const Font base_font;
97 PlatformFontWin* platform_font =
98 static_cast<PlatformFontWin*>(base_font.platform_font());
99
100 const Font derived_font = platform_font->DeriveFontWithHeight(1, 0);
101 EXPECT_GT(derived_font.GetHeight(), 1);
102 }
103
104 } // namespace gfx
105