gfx/font_unittest.cc

// Copyright (c) 2006-2008 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 "gfx/font.h"

#if defined(OS_WIN)
#include "gfx/platform_font_win.h"
#endif  // defined(OS_WIN)
#include "testing/gtest/include/gtest/gtest.h"

namespace {

using gfx::Font;

class FontTest : public testing::Test {
};

#if defined(OS_WIN)
class ScopedMinimumFontSizeCallback {
 public:
  explicit ScopedMinimumFontSizeCallback(int minimum_size) {
    minimum_size_ = minimum_size;
    old_callback_ = gfx::PlatformFontWin::get_minimum_font_size_callback;
    gfx::PlatformFontWin::get_minimum_font_size_callback = &GetMinimumFontSize;
  }

  ~ScopedMinimumFontSizeCallback() {
    gfx::PlatformFontWin::get_minimum_font_size_callback = old_callback_;
  }

 private:
  static int GetMinimumFontSize() {
    return minimum_size_;
  }

  gfx::PlatformFontWin::GetMinimumFontSizeCallback old_callback_;
  static int minimum_size_;

  DISALLOW_COPY_AND_ASSIGN(ScopedMinimumFontSizeCallback);
};

int ScopedMinimumFontSizeCallback::minimum_size_ = 0;
#endif  // defined(OS_WIN)


TEST_F(FontTest, LoadArial) {
  Font cf(L"Arial", 16);
  ASSERT_TRUE(cf.GetNativeFont());
  ASSERT_EQ(cf.GetStyle(), Font::NORMAL);
  ASSERT_EQ(cf.GetFontSize(), 16);
  ASSERT_EQ(cf.GetFontName(), L"Arial");
}

TEST_F(FontTest, LoadArialBold) {
  Font cf(L"Arial", 16);
  Font bold(cf.DeriveFont(0, Font::BOLD));
  ASSERT_TRUE(bold.GetNativeFont());
  ASSERT_EQ(bold.GetStyle(), Font::BOLD);
}

TEST_F(FontTest, Ascent) {
  Font cf(L"Arial", 16);
  ASSERT_GT(cf.GetBaseline(), 2);
  ASSERT_LE(cf.GetBaseline(), 22);
}

TEST_F(FontTest, Height) {
  Font cf(L"Arial", 16);
  ASSERT_GE(cf.GetHeight(), 16);
  // TODO(akalin): Figure out why height is so large on Linux.
  ASSERT_LE(cf.GetHeight(), 26);
}

TEST_F(FontTest, AvgWidths) {
  Font cf(L"Arial", 16);
  ASSERT_EQ(cf.GetExpectedTextWidth(0), 0);
  ASSERT_GT(cf.GetExpectedTextWidth(1), cf.GetExpectedTextWidth(0));
  ASSERT_GT(cf.GetExpectedTextWidth(2), cf.GetExpectedTextWidth(1));
  ASSERT_GT(cf.GetExpectedTextWidth(3), cf.GetExpectedTextWidth(2));
}

TEST_F(FontTest, Widths) {
  Font cf(L"Arial", 16);
  ASSERT_EQ(cf.GetStringWidth(L""), 0);
  ASSERT_GT(cf.GetStringWidth(L"a"), cf.GetStringWidth(L""));
  ASSERT_GT(cf.GetStringWidth(L"ab"), cf.GetStringWidth(L"a"));
  ASSERT_GT(cf.GetStringWidth(L"abc"), cf.GetStringWidth(L"ab"));
}

#if defined(OS_WIN)
TEST_F(FontTest, DeriveFontResizesIfSizeTooSmall) {
  // This creates font of height -8.
  Font cf(L"Arial", 6);
  // The minimum font size is set to 5 in browser_main.cc.
  ScopedMinimumFontSizeCallback minimum_size(5);

  Font derived_font = cf.DeriveFont(-4);
  LOGFONT font_info;
  GetObject(derived_font.GetNativeFont(), sizeof(LOGFONT), &font_info);
  EXPECT_EQ(-5, font_info.lfHeight);
}

TEST_F(FontTest, DeriveFontKeepsOriginalSizeIfHeightOk) {
  // This creates font of height -8.
  Font cf(L"Arial", 6);
  // The minimum font size is set to 5 in browser_main.cc.
  ScopedMinimumFontSizeCallback minimum_size(5);

  Font derived_font = cf.DeriveFont(-2);
  LOGFONT font_info;
  GetObject(derived_font.GetNativeFont(), sizeof(LOGFONT), &font_info);
  EXPECT_EQ(-6, font_info.lfHeight);
}
#endif
}  // namespace