| // 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_fallback.h" |
| |
| #include <fontconfig/fontconfig.h> |
| |
| #include <map> |
| #include <string> |
| #include <vector> |
| |
| #include "base/lazy_instance.h" |
| |
| namespace gfx { |
| |
| namespace { |
| |
| typedef std::map<std::string, std::vector<std::string> > FallbackCache; |
| base::LazyInstance<FallbackCache>::Leaky g_fallback_cache = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| } // namespace |
| |
| std::vector<std::string> GetFallbackFontFamilies( |
| const std::string& font_family) { |
| std::vector<std::string>* fallback_fonts = |
| &g_fallback_cache.Get()[font_family]; |
| if (!fallback_fonts->empty()) |
| return *fallback_fonts; |
| |
| FcPattern* pattern = FcPatternCreate(); |
| FcValue family; |
| family.type = FcTypeString; |
| family.u.s = reinterpret_cast<const FcChar8*>(font_family.c_str()); |
| FcPatternAdd(pattern, FC_FAMILY, family, FcFalse); |
| if (FcConfigSubstitute(NULL, pattern, FcMatchPattern) == FcTrue) { |
| FcDefaultSubstitute(pattern); |
| FcResult result; |
| FcFontSet* fonts = FcFontSort(NULL, pattern, FcTrue, NULL, &result); |
| if (fonts) { |
| for (int i = 0; i < fonts->nfont; ++i) { |
| char* name = NULL; |
| FcPatternGetString(fonts->fonts[i], FC_FAMILY, 0, |
| reinterpret_cast<FcChar8**>(&name)); |
| // FontConfig returns multiple fonts with the same family name and |
| // different configurations. Check to prevent duplicate family names. |
| if (fallback_fonts->empty() || fallback_fonts->back() != name) |
| fallback_fonts->push_back(std::string(name)); |
| } |
| FcFontSetDestroy(fonts); |
| } |
| } |
| FcPatternDestroy(pattern); |
| |
| if (fallback_fonts->empty()) |
| fallback_fonts->push_back(font_family); |
| |
| return *fallback_fonts; |
| } |
| |
| } // namespace gfx |