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// Copyright (c) 2012 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 "ui/gfx/platform_font_win.h"
#include "base/logging.h"
#include "base/memory/ref_counted.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/font.h"
namespace gfx {
namespace {
// Returns a font based on |base_font| with height at most |target_height| and
// font size maximized. Returns |base_font| if height is already equal.
gfx::Font AdjustFontSizeForHeight(const gfx::Font& base_font,
int target_height) {
Font expected_font = base_font;
if (base_font.GetHeight() < target_height) {
// Increase size while height is <= |target_height|.
Font larger_font = base_font.DeriveFont(1, 0);
while (larger_font.GetHeight() <= target_height) {
expected_font = larger_font;
larger_font = larger_font.DeriveFont(1, 0);
}
} else if (expected_font.GetHeight() > target_height) {
// Decrease size until height is <= |target_height|.
do {
expected_font = expected_font.DeriveFont(-1, 0);
} while (expected_font.GetHeight() > target_height);
}
return expected_font;
}
} // namespace
TEST(PlatformFontWinTest, DeriveFontWithHeight) {
const Font base_font;
PlatformFontWin* platform_font =
static_cast<PlatformFontWin*>(base_font.platform_font());
for (int i = -10; i < 10; i++) {
const int target_height = base_font.GetHeight() + i;
Font expected_font = AdjustFontSizeForHeight(base_font, target_height);
ASSERT_LE(expected_font.GetHeight(), target_height);
Font derived_font = platform_font->DeriveFontWithHeight(target_height, 0);
EXPECT_EQ(expected_font.GetFontName(), derived_font.GetFontName());
EXPECT_EQ(expected_font.GetFontSize(), derived_font.GetFontSize());
EXPECT_LE(expected_font.GetHeight(), target_height);
EXPECT_EQ(0, derived_font.GetStyle());
derived_font = platform_font->DeriveFontWithHeight(target_height,
Font::BOLD);
EXPECT_EQ(expected_font.GetFontName(), derived_font.GetFontName());
EXPECT_EQ(expected_font.GetFontSize(), derived_font.GetFontSize());
EXPECT_LE(expected_font.GetHeight(), target_height);
EXPECT_EQ(Font::BOLD, derived_font.GetStyle());
// Test that deriving from the new font has the expected result.
Font rederived_font = derived_font.DeriveFont(1, 0);
expected_font = Font(derived_font.GetFontName(),
derived_font.GetFontSize() + 1);
EXPECT_EQ(expected_font.GetFontName(), rederived_font.GetFontName());
EXPECT_EQ(expected_font.GetFontSize(), rederived_font.GetFontSize());
EXPECT_EQ(expected_font.GetHeight(), rederived_font.GetHeight());
}
}
// Callback function used by DeriveFontWithHeight_MinSize() below.
static int GetMinFontSize() {
return 10;
}
TEST(PlatformFontWinTest, DeriveFontWithHeight_MinSize) {
PlatformFontWin::GetMinimumFontSizeCallback old_callback =
PlatformFontWin::get_minimum_font_size_callback;
PlatformFontWin::get_minimum_font_size_callback = &GetMinFontSize;
const Font base_font;
const Font min_font(base_font.GetFontName(), GetMinFontSize());
PlatformFontWin* platform_font =
static_cast<PlatformFontWin*>(base_font.platform_font());
const Font derived_font =
platform_font->DeriveFontWithHeight(min_font.GetHeight() - 1, 0);
EXPECT_EQ(min_font.GetFontSize(), derived_font.GetFontSize());
EXPECT_EQ(min_font.GetHeight(), derived_font.GetHeight());
PlatformFontWin::get_minimum_font_size_callback = old_callback;
}
TEST(PlatformFontWinTest, DeriveFontWithHeight_TooSmall) {
const Font base_font;
PlatformFontWin* platform_font =
static_cast<PlatformFontWin*>(base_font.platform_font());
const Font derived_font = platform_font->DeriveFontWithHeight(1, 0);
EXPECT_GT(derived_font.GetHeight(), 1);
}
} // namespace gfx
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