Add LayoutLocale class

third_party/WebKit/Source/platform/text/Hyphenation.cpp

 // Copyright 2016 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 "platform/text/Hyphenation.h"
 
+#include "platform/fonts/Font.h"
 #include "wtf/text/StringView.h"
 
 namespace blink {
 
-Hyphenation::HyphenationMap& Hyphenation::getHyphenationMap()
-{
-    DEFINE_STATIC_LOCAL(HyphenationMap, hyphenationMap, ());
-    return hyphenationMap;
-}
-
-Hyphenation* Hyphenation::get(const AtomicString& locale)
-{
-    DCHECK(!locale.isNull());
-    Hyphenation::HyphenationMap& hyphenationMap = getHyphenationMap();
-    const auto& it = hyphenationMap.find(locale);
-    if (it != hyphenationMap.end())
-        return it->value.get();
-
-    return hyphenationMap.add(locale, platformGetHyphenation(locale))
-        .storedValue->value.get();
-}
-
-void Hyphenation::setForTesting(const AtomicString& locale, PassRefPtr<Hyphenation> hyphenation)
-{
-    getHyphenationMap().set(locale, hyphenation);
-}
-
-void Hyphenation::clearForTesting()
-{
-    getHyphenationMap().clear();
-}
-
 Vector<size_t, 8> Hyphenation::hyphenLocations(const StringView& text) const
 {
     Vector<size_t, 8> hyphenLocations;
     size_t hyphenLocation = text.length();
     if (hyphenLocation <= minimumSuffixLength)
         return hyphenLocations;
     hyphenLocation -= minimumSuffixLength;
 
     while ((hyphenLocation = lastHyphenLocation(text, hyphenLocation)) >= minimumPrefixLength)
         hyphenLocations.append(hyphenLocation);
 
     return hyphenLocations;
 }
 
+int Hyphenation::minimumPrefixWidth(const Font& font)
+{
+    // If the maximum width available for the prefix before the hyphen is small, then it is very unlikely
+    // that an hyphenation opportunity exists, so do not bother to look for it.
+    // These are heuristic numbers for performance added in http://wkb.ug/45606
+    const int minimumPrefixWidthNumerator = 5;
+    const int minimumPrefixWidthDenominator = 4;
+    return font.getFontDescription().computedPixelSize()
+        * minimumPrefixWidthNumerator / minimumPrefixWidthDenominator;
+}
+
 } // namespace blink