ui/gfx/platform_font_win_unittest.cc

   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 "base/strings/string16.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "base/win/scoped_hdc.h"
  12 #include "base/win/scoped_select_object.h"
  13 #include "testing/gtest/include/gtest/gtest.h"
  14 #include "ui/gfx/font.h"
  15 #include "ui/gfx/win/direct_write.h"
  16 #include "ui/gfx/win/scoped_set_map_mode.h"
  17
  18 namespace gfx {
  19
  20 TEST(PlatformFontWinTest, DeriveFontWithHeight) {
  21   const Font base_font;
  22   PlatformFontWin* platform_font =
  23       static_cast<PlatformFontWin*>(base_font.platform_font());
  24
  25   for (int i = -10; i < 10; i++) {
  26     const int target_height = base_font.GetHeight() + i;
  27
  28     Font derived_font = platform_font->DeriveFontWithHeight(target_height, 0);
  29     EXPECT_LE(derived_font.GetHeight(), target_height);
  30     EXPECT_GT(derived_font.Derive(1, 0).GetHeight(), target_height);
  31     EXPECT_EQ(platform_font->GetActualFontNameForTesting(),
  32               derived_font.GetActualFontNameForTesting());
  33     EXPECT_EQ(0, derived_font.GetStyle());
  34
  35     derived_font = platform_font->DeriveFontWithHeight(target_height,
  36                                                        Font::BOLD);
  37     EXPECT_LE(derived_font.GetHeight(), target_height);
  38     EXPECT_GT(derived_font.Derive(1, 0).GetHeight(), target_height);
  39     EXPECT_EQ(platform_font->GetActualFontNameForTesting(),
  40               derived_font.GetActualFontNameForTesting());
  41     EXPECT_EQ(Font::BOLD, derived_font.GetStyle());
  42   }
  43 }
  44
  45 TEST(PlatformFontWinTest, DeriveFontWithHeight_Consistency) {
  46   gfx::Font arial_12("Arial", 12);
  47   ASSERT_GT(16, arial_12.GetHeight());
  48   gfx::Font derived_1 = static_cast<PlatformFontWin*>(
  49       arial_12.platform_font())->DeriveFontWithHeight(16, 0);
  50
  51   gfx::Font arial_15("Arial", 15);
  52   ASSERT_LT(16, arial_15.GetHeight());
  53   gfx::Font derived_2 = static_cast<PlatformFontWin*>(
  54       arial_15.platform_font())->DeriveFontWithHeight(16, 0);
  55
  56   EXPECT_EQ(derived_1.GetFontSize(), derived_2.GetFontSize());
  57   EXPECT_EQ(16, derived_1.GetHeight());
  58   EXPECT_EQ(16, derived_2.GetHeight());
  59 }
  60
  61 // Callback function used by DeriveFontWithHeight_MinSize() below.
  62 static int GetMinFontSize() {
  63   return 10;
  64 }
  65
  66 TEST(PlatformFontWinTest, DeriveFontWithHeight_MinSize) {
  67   PlatformFontWin::GetMinimumFontSizeCallback old_callback =
  68     PlatformFontWin::get_minimum_font_size_callback;
  69   PlatformFontWin::get_minimum_font_size_callback = &GetMinFontSize;
  70
  71   const Font base_font;
  72   const Font min_font(base_font.GetFontName(), GetMinFontSize());
  73   PlatformFontWin* platform_font =
  74       static_cast<PlatformFontWin*>(base_font.platform_font());
  75
  76   const Font derived_font =
  77       platform_font->DeriveFontWithHeight(min_font.GetHeight() - 1, 0);
  78   EXPECT_EQ(min_font.GetFontSize(), derived_font.GetFontSize());
  79   EXPECT_EQ(min_font.GetHeight(), derived_font.GetHeight());
  80
  81   PlatformFontWin::get_minimum_font_size_callback = old_callback;
  82 }
  83
  84 TEST(PlatformFontWinTest, DeriveFontWithHeight_TooSmall) {
  85   const Font base_font;
  86   PlatformFontWin* platform_font =
  87       static_cast<PlatformFontWin*>(base_font.platform_font());
  88
  89   const Font derived_font = platform_font->DeriveFontWithHeight(1, 0);
  90   EXPECT_GT(derived_font.GetHeight(), 1);
  91 }
  92
  93 // Test whether font metrics retrieved by DirectWrite (skia) and GDI match as
  94 // per assumptions mentioned below:-
  95 // 1. Font size is the same
  96 // 2. The difference between GDI and DirectWrite for font height, baseline,
  97 //    and cap height is at most 1. For smaller font sizes under 12, GDI
  98 //    font heights/baselines/cap height are equal/larger by 1 point. For larger
  99 //    font sizes DirectWrite font heights/baselines/cap height are equal/larger
 100 //    by 1 point.
 101 TEST(PlatformFontWinTest, Metrics_SkiaVersusGDI) {
 102   if (!gfx::win::IsDirectWriteEnabled())
 103     return;
 104
 105   // Describes the font being tested.
 106   struct FontInfo {
 107     base::string16 font_name;
 108     int font_size;
 109   };
 110
 111   FontInfo fonts[] = {
 112     {base::ASCIIToUTF16("Arial"), 6},
 113     {base::ASCIIToUTF16("Arial"), 8},
 114     {base::ASCIIToUTF16("Arial"), 10},
 115     {base::ASCIIToUTF16("Arial"), 12},
 116     {base::ASCIIToUTF16("Arial"), 16},
 117     {base::ASCIIToUTF16("Symbol"), 6},
 118     {base::ASCIIToUTF16("Symbol"), 10},
 119     {base::ASCIIToUTF16("Symbol"), 12},
 120     {base::ASCIIToUTF16("Tahoma"), 10},
 121     {base::ASCIIToUTF16("Tahoma"), 16},
 122     {base::ASCIIToUTF16("Segoe UI"), 6},
 123     {base::ASCIIToUTF16("Segoe UI"), 8},
 124     {base::ASCIIToUTF16("Segoe UI"), 20},
 125   };
 126
 127   base::win::ScopedGetDC screen_dc(NULL);
 128   gfx::ScopedSetMapMode mode(screen_dc, MM_TEXT);
 129
 130   for (int i = 0; i < arraysize(fonts); ++i) {
 131     LOGFONT font_info = {0};
 132
 133     font_info.lfHeight = -fonts[i].font_size;
 134     font_info.lfWeight = FW_NORMAL;
 135     wcscpy_s(font_info.lfFaceName,
 136              fonts[i].font_name.length() + 1,
 137              fonts[i].font_name.c_str());
 138
 139     HFONT font = CreateFontIndirect(&font_info);
 140
 141     TEXTMETRIC font_metrics;
 142     PlatformFontWin::GetTextMetricsForFont(screen_dc, font, &font_metrics);
 143
 144     scoped_refptr<PlatformFontWin::HFontRef> h_font_gdi(
 145         PlatformFontWin::CreateHFontRefFromGDI(font, font_metrics));
 146
 147     scoped_refptr<PlatformFontWin::HFontRef> h_font_skia(
 148         PlatformFontWin::CreateHFontRefFromSkia(font, font_metrics));
 149
 150     EXPECT_EQ(h_font_gdi->font_size(), h_font_skia->font_size());
 151     EXPECT_EQ(h_font_gdi->style(), h_font_skia->style());
 152     EXPECT_EQ(h_font_gdi->font_name(), h_font_skia->font_name());
 153     EXPECT_EQ(h_font_gdi->ave_char_width(), h_font_skia->ave_char_width());
 154
 155     EXPECT_LE(abs(h_font_gdi->cap_height() - h_font_skia->cap_height()), 1);
 156     EXPECT_LE(abs(h_font_gdi->baseline() - h_font_skia->baseline()), 1);
 157     EXPECT_LE(abs(h_font_gdi->height() - h_font_skia->height()), 1);
 158   }
 159 }
 160
 161 }  // namespace gfx