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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/font_list.h"
#include <algorithm>
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
namespace {
// Parses font description into |font_names|, |font_style| and |font_size|.
void ParseFontDescriptionString(const std::string& font_description_string,
std::vector<std::string>* font_names,
int* font_style,
int* font_size) {
base::SplitString(font_description_string, ',', font_names);
DCHECK_GT(font_names->size(), 1U);
// The last item is [STYLE_OPTIONS] SIZE.
std::vector<std::string> styles_size;
base::SplitString(font_names->back(), ' ', &styles_size);
DCHECK(!styles_size.empty());
base::StringToInt(styles_size.back(), font_size);
DCHECK_GT(*font_size, 0);
font_names->pop_back();
// Font supports BOLD and ITALIC; underline is supported via RenderText.
*font_style = 0;
for (size_t i = 0; i < styles_size.size() - 1; ++i) {
// Styles are separated by white spaces. base::SplitString splits styles
// by space, and it inserts empty string for continuous spaces.
if (styles_size[i].empty())
continue;
if (!styles_size[i].compare("Bold"))
*font_style |= gfx::Font::BOLD;
else if (!styles_size[i].compare("Italic"))
*font_style |= gfx::Font::ITALIC;
else
NOTREACHED();
}
}
// Returns the font style and size as a string.
std::string FontStyleAndSizeToString(int font_style, int font_size) {
std::string result;
if (font_style & gfx::Font::BOLD)
result += "Bold ";
if (font_style & gfx::Font::ITALIC)
result += "Italic ";
result += base::IntToString(font_size);
result += "px";
return result;
}
// Returns font description from |font_names|, |font_style|, and |font_size|.
std::string BuildFontDescription(const std::vector<std::string>& font_names,
int font_style,
int font_size) {
std::string description = JoinString(font_names, ',');
description += "," + FontStyleAndSizeToString(font_style, font_size);
return description;
}
} // namespace
namespace gfx {
FontList::FontList()
: common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1) {
fonts_.push_back(Font());
}
FontList::FontList(const std::string& font_description_string)
: font_description_string_(font_description_string),
common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1) {
DCHECK(!font_description_string.empty());
// DCHECK description string ends with "px" for size in pixel.
DCHECK(EndsWith(font_description_string, "px", true));
}
FontList::FontList(const std::vector<std::string>& font_names,
int font_style,
int font_size)
: font_description_string_(BuildFontDescription(font_names, font_style,
font_size)),
common_height_(-1),
common_baseline_(-1),
font_style_(font_style),
font_size_(font_size) {
DCHECK(!font_names.empty());
DCHECK(!font_names[0].empty());
}
FontList::FontList(const std::vector<Font>& fonts)
: fonts_(fonts),
common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1) {
DCHECK(!fonts.empty());
font_style_ = fonts[0].GetStyle();
font_size_ = fonts[0].GetFontSize();
if (DCHECK_IS_ON()) {
for (size_t i = 1; i < fonts.size(); ++i) {
DCHECK_EQ(fonts[i].GetStyle(), font_style_);
DCHECK_EQ(fonts[i].GetFontSize(), font_size_);
}
}
}
FontList::FontList(const Font& font)
: common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1) {
fonts_.push_back(font);
}
FontList::~FontList() {
}
FontList FontList::DeriveFontList(int font_style) const {
return DeriveFontListWithSizeDeltaAndStyle(0, font_style);
}
FontList FontList::DeriveFontListWithSize(int size) const {
DCHECK_GT(size, 0);
return DeriveFontListWithSizeDeltaAndStyle(size - GetFontSize(),
GetFontStyle());
}
FontList FontList::DeriveFontListWithSizeDelta(int size_delta) const {
return DeriveFontListWithSizeDeltaAndStyle(size_delta, GetFontStyle());
}
FontList FontList::DeriveFontListWithSizeDeltaAndStyle(int size_delta,
int style) const {
// If there is a font vector, derive from that.
if (!fonts_.empty()) {
std::vector<Font> fonts = fonts_;
for (size_t i = 0; i < fonts.size(); ++i)
fonts[i] = fonts[i].DeriveFont(size_delta, style);
return FontList(fonts);
}
// Otherwise, parse the font description string to derive from it.
std::vector<std::string> font_names;
int old_size;
int old_style;
ParseFontDescriptionString(font_description_string_, &font_names,
&old_style, &old_size);
int size = old_size + size_delta;
DCHECK_GT(size, 0);
return FontList(font_names, style, size);
}
int FontList::GetHeight() const {
if (common_height_ == -1)
CacheCommonFontHeightAndBaseline();
return common_height_;
}
int FontList::GetBaseline() const {
if (common_baseline_ == -1)
CacheCommonFontHeightAndBaseline();
return common_baseline_;
}
int FontList::GetCapHeight() const {
// Assume the primary font is used to render Latin characters.
return GetPrimaryFont().GetCapHeight();
}
int FontList::GetStringWidth(const base::string16& text) const {
// Rely on the primary font metrics for the time being.
// TODO(yukishiino): Not only the first font, all the fonts in the list should
// be taken into account to compute the pixels needed to display |text|.
// Also this method, including one in Font class, should be deprecated and
// client code should call Canvas::GetStringWidth(text, font_list) directly.
// Our plan is as follows:
// 1. Introduce the FontList version of Canvas::GetStringWidth().
// 2. Make client code call Canvas::GetStringWidth().
// 3. Retire {Font,FontList}::GetStringWidth().
return GetPrimaryFont().GetStringWidth(text);
}
int FontList::GetExpectedTextWidth(int length) const {
// Rely on the primary font metrics for the time being.
return GetPrimaryFont().GetExpectedTextWidth(length);
}
int FontList::GetFontStyle() const {
if (font_style_ == -1)
CacheFontStyleAndSize();
return font_style_;
}
const std::string& FontList::GetFontDescriptionString() const {
if (font_description_string_.empty()) {
DCHECK(!fonts_.empty());
for (size_t i = 0; i < fonts_.size(); ++i) {
std::string name = fonts_[i].GetFontName();
font_description_string_ += name;
font_description_string_ += ',';
}
// All fonts have the same style and size.
font_description_string_ +=
FontStyleAndSizeToString(fonts_[0].GetStyle(), fonts_[0].GetFontSize());
}
return font_description_string_;
}
int FontList::GetFontSize() const {
if (font_size_ == -1)
CacheFontStyleAndSize();
return font_size_;
}
const std::vector<Font>& FontList::GetFonts() const {
if (fonts_.empty()) {
DCHECK(!font_description_string_.empty());
std::vector<std::string> font_names;
ParseFontDescriptionString(font_description_string_, &font_names,
&font_style_, &font_size_);
for (size_t i = 0; i < font_names.size(); ++i) {
DCHECK(!font_names[i].empty());
Font font(font_names[i], font_size_);
if (font_style_ == Font::NORMAL)
fonts_.push_back(font);
else
fonts_.push_back(font.DeriveFont(0, font_style_));
}
}
return fonts_;
}
const Font& FontList::GetPrimaryFont() const {
return GetFonts()[0];
}
void FontList::CacheCommonFontHeightAndBaseline() const {
int ascent = 0;
int descent = 0;
const std::vector<Font>& fonts = GetFonts();
for (std::vector<Font>::const_iterator i = fonts.begin();
i != fonts.end(); ++i) {
ascent = std::max(ascent, i->GetBaseline());
descent = std::max(descent, i->GetHeight() - i->GetBaseline());
}
common_height_ = ascent + descent;
common_baseline_ = ascent;
}
void FontList::CacheFontStyleAndSize() const {
if (!fonts_.empty()) {
font_style_ = fonts_[0].GetStyle();
font_size_ = fonts_[0].GetFontSize();
} else {
std::vector<std::string> font_names;
ParseFontDescriptionString(font_description_string_, &font_names,
&font_style_, &font_size_);
}
}
} // namespace gfx
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