blob: babadb118c15a32e00f5006dba277d090734edcd [file] [log] [blame]
// Copyright 2014 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_impl.h"
#include <algorithm>
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "ui/gfx/font.h"
#include "ui/gfx/font_list.h"
namespace {
// Returns a font description from |families|, |style|, and |size_pixels|.
std::string BuildDescription(const std::vector<std::string>& families,
int style,
int size_pixels) {
std::string description = JoinString(families, ',');
description += ",";
if (style & gfx::Font::BOLD)
description += "Bold ";
if (style & gfx::Font::ITALIC)
description += "Italic ";
description += base::IntToString(size_pixels);
description += "px";
return description;
}
} // namespace
namespace gfx {
FontListImpl::FontListImpl(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));
}
FontListImpl::FontListImpl(const std::vector<std::string>& font_names,
int font_style,
int font_size)
: font_description_string_(BuildDescription(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());
}
FontListImpl::FontListImpl(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_);
}
#endif
}
FontListImpl::FontListImpl(const Font& font)
: common_height_(-1),
common_baseline_(-1),
font_style_(-1),
font_size_(-1) {
fonts_.push_back(font);
}
FontListImpl* FontListImpl::Derive(int size_delta, int font_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].Derive(size_delta, font_style);
return new FontListImpl(fonts);
}
// Otherwise, parse the font description string to derive from it.
std::vector<std::string> font_names;
int old_size;
int old_style;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&old_style, &old_size));
const int size = std::max(1, old_size + size_delta);
return new FontListImpl(font_names, font_style, size);
}
int FontListImpl::GetHeight() const {
if (common_height_ == -1)
CacheCommonFontHeightAndBaseline();
return common_height_;
}
int FontListImpl::GetBaseline() const {
if (common_baseline_ == -1)
CacheCommonFontHeightAndBaseline();
return common_baseline_;
}
int FontListImpl::GetCapHeight() const {
// Assume the primary font is used to render Latin characters.
return GetPrimaryFont().GetCapHeight();
}
int FontListImpl::GetExpectedTextWidth(int length) const {
// Rely on the primary font metrics for the time being.
return GetPrimaryFont().GetExpectedTextWidth(length);
}
int FontListImpl::GetFontStyle() const {
if (font_style_ == -1)
CacheFontStyleAndSize();
return font_style_;
}
int FontListImpl::GetFontSize() const {
if (font_size_ == -1)
CacheFontStyleAndSize();
return font_size_;
}
const std::vector<Font>& FontListImpl::GetFonts() const {
if (fonts_.empty()) {
DCHECK(!font_description_string_.empty());
std::vector<std::string> font_names;
// It's possible that gfx::Font::UNDERLINE is specified and it's already
// stored in |font_style_| but |font_description_string_| doesn't have the
// underline info. So we should respect |font_style_| as long as it's
// valid.
int style = 0;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&style, &font_size_));
if (font_style_ == -1)
font_style_ = style;
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.Derive(0, font_style_));
}
}
return fonts_;
}
const Font& FontListImpl::GetPrimaryFont() const {
return GetFonts()[0];
}
FontListImpl::~FontListImpl() {}
void FontListImpl::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 FontListImpl::CacheFontStyleAndSize() const {
if (!fonts_.empty()) {
font_style_ = fonts_[0].GetStyle();
font_size_ = fonts_[0].GetFontSize();
} else {
std::vector<std::string> font_names;
CHECK(FontList::ParseDescription(font_description_string_, &font_names,
&font_style_, &font_size_));
}
}
} // namespace gfx