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// 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
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