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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 <ostream>
- #include "base/lazy_instance.h"
- #include "base/strings/string_number_conversions.h"
- #include "base/strings/string_split.h"
- #include "base/strings/string_util.h"
- #include "build/build_config.h"
- #include "third_party/skia/include/core/SkFontMgr.h"
- #include "third_party/skia/include/core/SkTypeface.h"
- #include "ui/gfx/font_list_impl.h"
- namespace {
- // Font description of the default font set.
- base::LazyInstance<std::string>::Leaky g_default_font_description =
- LAZY_INSTANCE_INITIALIZER;
- // The default instance of gfx::FontListImpl.
- base::LazyInstance<scoped_refptr<gfx::FontListImpl>>::Leaky g_default_impl =
- LAZY_INSTANCE_INITIALIZER;
- bool g_default_impl_initialized = false;
- bool IsFontFamilyAvailable(const std::string& family, SkFontMgr* fontManager) {
- #if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_CHROMEOS)
- return !!fontManager->legacyMakeTypeface(family.c_str(), SkFontStyle());
- #else
- sk_sp<SkFontStyleSet> set(fontManager->matchFamily(family.c_str()));
- return set && set->count();
- #endif
- }
- } // namespace
- namespace gfx {
- // static
- bool FontList::ParseDescription(const std::string& description,
- std::vector<std::string>* families_out,
- int* style_out,
- int* size_pixels_out,
- Font::Weight* weight_out) {
- DCHECK(families_out);
- DCHECK(style_out);
- DCHECK(size_pixels_out);
- DCHECK(weight_out);
- *families_out = base::SplitString(
- description, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
- if (families_out->empty())
- return false;
- for (auto& family : *families_out)
- base::TrimWhitespaceASCII(family, base::TRIM_ALL, &family);
- // The last item is "[STYLE1] [STYLE2] [...] SIZE".
- std::vector<std::string> styles = base::SplitString(
- families_out->back(), base::kWhitespaceASCII,
- base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
- families_out->pop_back();
- if (styles.empty())
- return false;
- // The size takes the form "<INT>px".
- std::string size_string = styles.back();
- styles.pop_back();
- if (!base::EndsWith(size_string, "px", base::CompareCase::SENSITIVE))
- return false;
- size_string.resize(size_string.size() - 2);
- if (!base::StringToInt(size_string, size_pixels_out) ||
- *size_pixels_out <= 0)
- return false;
- // Font supports ITALIC and weights; underline is supported via RenderText.
- *style_out = Font::NORMAL;
- *weight_out = Font::Weight::NORMAL;
- for (const auto& style_string : styles) {
- if (style_string == "Italic")
- *style_out |= Font::ITALIC;
- else if (style_string == "Thin")
- *weight_out = Font::Weight::THIN;
- else if (style_string == "Ultra-Light")
- *weight_out = Font::Weight::EXTRA_LIGHT;
- else if (style_string == "Light")
- *weight_out = Font::Weight::LIGHT;
- else if (style_string == "Normal")
- *weight_out = Font::Weight::NORMAL;
- else if (style_string == "Medium")
- *weight_out = Font::Weight::MEDIUM;
- else if (style_string == "Semi-Bold")
- *weight_out = Font::Weight::SEMIBOLD;
- else if (style_string == "Bold")
- *weight_out = Font::Weight::BOLD;
- else if (style_string == "Ultra-Bold")
- *weight_out = Font::Weight::EXTRA_BOLD;
- else if (style_string == "Heavy")
- *weight_out = Font::Weight::BLACK;
- else
- return false;
- }
- return true;
- }
- FontList::FontList() : impl_(GetDefaultImpl()) {}
- FontList::FontList(const FontList& other) : impl_(other.impl_) {}
- FontList::FontList(const std::string& font_description_string)
- : impl_(new FontListImpl(font_description_string)) {}
- FontList::FontList(const std::vector<std::string>& font_names,
- int font_style,
- int font_size,
- Font::Weight font_weight)
- : impl_(new FontListImpl(font_names, font_style, font_size, font_weight)) {}
- FontList::FontList(const std::vector<Font>& fonts)
- : impl_(new FontListImpl(fonts)) {}
- FontList::FontList(const Font& font) : impl_(new FontListImpl(font)) {}
- FontList::~FontList() {}
- FontList& FontList::operator=(const FontList& other) {
- impl_ = other.impl_;
- return *this;
- }
- // static
- void FontList::SetDefaultFontDescription(const std::string& font_description) {
- // The description string must end with "px" for size in pixel, or must be
- // the empty string, which specifies to use a single default font.
- DCHECK(font_description.empty() ||
- base::EndsWith(font_description, "px", base::CompareCase::SENSITIVE));
- g_default_font_description.Get() = font_description;
- g_default_impl_initialized = false;
- }
- FontList FontList::Derive(int size_delta,
- int font_style,
- Font::Weight weight) const {
- return FontList(impl_->Derive(size_delta, font_style, weight));
- }
- FontList FontList::DeriveWithSizeDelta(int size_delta) const {
- return Derive(size_delta, GetFontStyle(), GetFontWeight());
- }
- FontList FontList::DeriveWithStyle(int font_style) const {
- return Derive(0, font_style, GetFontWeight());
- }
- FontList FontList::DeriveWithWeight(Font::Weight weight) const {
- return Derive(0, GetFontStyle(), weight);
- }
- FontList FontList::DeriveWithHeightUpperBound(int height) const {
- FontList font_list(*this);
- for (int font_size = font_list.GetFontSize(); font_size > 1; --font_size) {
- const int internal_leading =
- font_list.GetBaseline() - font_list.GetCapHeight();
- // Some platforms don't support getting the cap height, and simply return
- // the entire font ascent from GetCapHeight(). Centering the ascent makes
- // the font look too low, so if GetCapHeight() returns the ascent, center
- // the entire font height instead.
- const int space =
- height - ((internal_leading != 0) ?
- font_list.GetCapHeight() : font_list.GetHeight());
- const int y_offset = space / 2 - internal_leading;
- const int space_at_bottom = height - (y_offset + font_list.GetHeight());
- if ((y_offset >= 0) && (space_at_bottom >= 0))
- break;
- font_list = font_list.DeriveWithSizeDelta(-1);
- }
- return font_list;
- }
- int FontList::GetHeight() const {
- return impl_->GetHeight();
- }
- int FontList::GetBaseline() const {
- return impl_->GetBaseline();
- }
- int FontList::GetCapHeight() const {
- return impl_->GetCapHeight();
- }
- int FontList::GetExpectedTextWidth(int length) const {
- return impl_->GetExpectedTextWidth(length);
- }
- int FontList::GetFontStyle() const {
- return impl_->GetFontStyle();
- }
- int FontList::GetFontSize() const {
- return impl_->GetFontSize();
- }
- Font::Weight FontList::GetFontWeight() const {
- return impl_->GetFontWeight();
- }
- const std::vector<Font>& FontList::GetFonts() const {
- return impl_->GetFonts();
- }
- const Font& FontList::GetPrimaryFont() const {
- return impl_->GetPrimaryFont();
- }
- FontList::FontList(FontListImpl* impl) : impl_(impl) {}
- // static
- const scoped_refptr<FontListImpl>& FontList::GetDefaultImpl() {
- // SetDefaultFontDescription() must be called and the default font description
- // must be set earlier than any call of this function.
- DCHECK(g_default_font_description.IsCreated())
- << "SetDefaultFontDescription has not been called.";
- if (!g_default_impl_initialized) {
- g_default_impl.Get() =
- g_default_font_description.Get().empty() ?
- new FontListImpl(Font()) :
- new FontListImpl(g_default_font_description.Get());
- g_default_impl_initialized = true;
- }
- return g_default_impl.Get();
- }
- // static
- std::string FontList::FirstAvailableOrFirst(const std::string& font_name_list) {
- std::vector<std::string> families = base::SplitString(
- font_name_list, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
- if (families.empty())
- return std::string();
- if (families.size() == 1)
- return families[0];
- sk_sp<SkFontMgr> fm(SkFontMgr::RefDefault());
- for (const auto& family : families) {
- if (IsFontFamilyAvailable(family, fm.get()))
- return family;
- }
- return families[0];
- }
- } // namespace gfx
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