third_party/WebKit/Source/platform/fonts/AlternateFontFamily.h

/*
 * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
 * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
 * Copyright (C) 2013 Google, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef AlternateFontFamily_h
#define AlternateFontFamily_h

#include "platform/fonts/FontDescription.h"
#include "wtf/text/AtomicString.h"

namespace blink {

// We currently do not support bitmap fonts on windows.
// Instead of trying to construct a bitmap font and then going down the fallback
// path map certain common bitmap fonts to their truetype equivalent up front.
inline const AtomicString& adjustFamilyNameToAvoidUnsupportedFonts(
    const AtomicString& familyName) {
#if OS(WIN)
  // On Windows, 'Courier New' (truetype font) is always present and
  // 'Courier' is a bitmap font. On Mac on the other hand 'Courier' is
  // a truetype font. Thus pages asking for Courier are better of
  // using 'Courier New' on windows.
  DEFINE_STATIC_LOCAL(AtomicString, courier, ("Courier"));
  DEFINE_STATIC_LOCAL(AtomicString, courierNew, ("Courier New"));
  if (equalIgnoringCase(familyName, courier))
    return courierNew;

  // Alias 'MS Sans Serif' (bitmap font) -> 'Microsoft Sans Serif'
  // (truetype font).
  DEFINE_STATIC_LOCAL(AtomicString, msSans, ("MS Sans Serif"));
  DEFINE_STATIC_LOCAL(AtomicString, microsoftSans, ("Microsoft Sans Serif"));
  if (equalIgnoringCase(familyName, msSans))
    return microsoftSans;

  // Alias 'MS Serif' (bitmap) -> 'Times New Roman' (truetype font).
  // Alias 'Times' -> 'Times New Roman' (truetype font).
  // There's no 'Microsoft Sans Serif-equivalent' for Serif.
  DEFINE_STATIC_LOCAL(AtomicString, msSerif, ("MS Serif"));
  DEFINE_STATIC_LOCAL(AtomicString, times, ("Times"));
  DEFINE_STATIC_LOCAL(AtomicString, timesNewRoman, ("Times New Roman"));
  if (equalIgnoringCase(familyName, msSerif) ||
      equalIgnoringCase(familyName, times))
    return timesNewRoman;
#endif

  return familyName;
}

inline const AtomicString& alternateFamilyName(const AtomicString& familyName) {
  // Alias Courier <-> Courier New
  DEFINE_STATIC_LOCAL(AtomicString, courier, ("Courier"));
  DEFINE_STATIC_LOCAL(AtomicString, courierNew, ("Courier New"));
  if (equalIgnoringCase(familyName, courier))
    return courierNew;
#if !OS(WIN)
  // On Windows, Courier New (truetype font) is always present and
  // Courier is a bitmap font. So, we don't want to map Courier New to
  // Courier.
  if (equalIgnoringCase(familyName, courierNew))
    return courier;
#endif

  // Alias Times and Times New Roman.
  DEFINE_STATIC_LOCAL(AtomicString, times, ("Times"));
  DEFINE_STATIC_LOCAL(AtomicString, timesNewRoman, ("Times New Roman"));
  if (equalIgnoringCase(familyName, times))
    return timesNewRoman;
  if (equalIgnoringCase(familyName, timesNewRoman))
    return times;

  // Alias Arial and Helvetica
  DEFINE_STATIC_LOCAL(AtomicString, arial, ("Arial"));
  DEFINE_STATIC_LOCAL(AtomicString, helvetica, ("Helvetica"));
  if (equalIgnoringCase(familyName, arial))
    return helvetica;
  if (equalIgnoringCase(familyName, helvetica))
    return arial;

  return emptyAtom;
}

inline const AtomicString getFallbackFontFamily(
    const FontDescription& description) {
  DEFINE_STATIC_LOCAL(const AtomicString, sansStr, ("sans-serif"));
  DEFINE_STATIC_LOCAL(const AtomicString, serifStr, ("serif"));
  DEFINE_STATIC_LOCAL(const AtomicString, monospaceStr, ("monospace"));
  DEFINE_STATIC_LOCAL(const AtomicString, cursiveStr, ("cursive"));
  DEFINE_STATIC_LOCAL(const AtomicString, fantasyStr, ("fantasy"));

  switch (description.genericFamily()) {
    case FontDescription::SansSerifFamily:
      return sansStr;
    case FontDescription::SerifFamily:
      return serifStr;
    case FontDescription::MonospaceFamily:
      return monospaceStr;
    case FontDescription::CursiveFamily:
      return cursiveStr;
    case FontDescription::FantasyFamily:
      return fantasyStr;
    default:
      // Let the caller use the system default font.
      return emptyAtom;
  }
}

}  // namespace blink

#endif  // AlternateFontFamily_h