third_party/WebKit/Source/core/css/FontSize.h

/*
 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
 * All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this library; see the file COPYING.LIB.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#ifndef FontSize_h
#define FontSize_h

#include "core/CSSValueKeywords.h"
#include "wtf/Allocator.h"

namespace blink {

class Document;

enum ESmartMinimumForFontSize {
  DoNotUseSmartMinimumForFontSize,
  UseSmartMinimumForFontSize
};

class FontSize {
  STATIC_ONLY(FontSize);

 public:
  static float getComputedSizeFromSpecifiedSize(
      const Document*,
      float zoomFactor,
      bool isAbsoluteSize,
      float specifiedSize,
      ESmartMinimumForFontSize = UseSmartMinimumForFontSize);

  // Given a CSS keyword in the range (xx-small to -webkit-xxx-large), this
  // function returns
  // values from '1' to '8'.
  static unsigned keywordSize(CSSValueID valueID) {
    ASSERT(isValidValueID(valueID));
    return valueID - CSSValueXxSmall + 1;
  }

  static bool isValidValueID(CSSValueID valueID) {
    return valueID >= CSSValueXxSmall && valueID <= CSSValueWebkitXxxLarge;
  }

  static CSSValueID initialValueID() { return CSSValueMedium; }
  static unsigned initialKeywordSize() { return keywordSize(initialValueID()); }

  // Given a keyword size in the range (1 to 8), this function will return
  // the correct font size scaled relative to the user's default (4).
  static float fontSizeForKeyword(const Document*,
                                  unsigned keyword,
                                  bool isMonospace);

  // Given a font size in pixel, this function will return legacy font size
  // between 1 and 7.
  static int legacyFontSize(const Document*,
                            int pixelFontSize,
                            bool isMonospace);
};

}  // namespace blink

#endif  // FontSize_h