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

   1 /*
   2  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
   3  * Copyright (C) 2014 Google Inc. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #ifndef FontTraits_h
  28 #define FontTraits_h
  29
  30 #include "wtf/Assertions.h"
  31
  32 namespace blink {
  33
  34 enum FontWeight {
  35     FontWeight100 = 0,
  36     FontWeight200 = 1,
  37     FontWeight300 = 2,
  38     FontWeight400 = 3,
  39     FontWeight500 = 4,
  40     FontWeight600 = 5,
  41     FontWeight700 = 6,
  42     FontWeight800 = 7,
  43     FontWeight900 = 8,
  44     FontWeightNormal = FontWeight400,
  45     FontWeightBold = FontWeight700
  46 };
  47
  48 // Numeric values matching OS/2 & Windows Metrics usWidthClass table.
  49 // https://www.microsoft.com/typography/otspec/os2.htm
  50 enum FontStretch {
  51     FontStretchUltraCondensed = 1,
  52     FontStretchExtraCondensed = 2,
  53     FontStretchCondensed = 3,
  54     FontStretchSemiCondensed = 4,
  55     FontStretchNormal = 5,
  56     FontStretchSemiExpanded = 6,
  57     FontStretchExpanded = 7,
  58     FontStretchExtraExpanded = 8,
  59     FontStretchUltraExpanded = 9
  60 };
  61
  62 enum FontStyle {
  63     FontStyleNormal = 0,
  64     FontStyleOblique = 1,
  65     FontStyleItalic = 2
  66 };
  67
  68 enum FontVariant {
  69     FontVariantNormal = 0,
  70     FontVariantSmallCaps = 1
  71 };
  72
  73 typedef unsigned FontTraitsBitfield;
  74
  75 struct FontTraits {
  76     FontTraits(FontStyle style, FontVariant variant, FontWeight weight, FontStretch stretch)
  77     {
  78         m_traits.m_style = style;
  79         // TODO(drott): crbug.com/516673 Variant is not relevant for font selection,
  80         // should be removed here.
  81         m_traits.m_variant = variant;
  82         m_traits.m_weight = weight;
  83         m_traits.m_stretch = stretch;
  84         m_traits.m_filler = 0;
  85         ASSERT(!(m_bitfield >> 11));
  86     }
  87     FontTraits(FontTraitsBitfield bitfield)
  88         : m_bitfield(bitfield)
  89     {
  90         ASSERT(!m_traits.m_filler);
  91         ASSERT(!(m_bitfield >> 11));
  92     }
  93     FontStyle style() const { return static_cast<FontStyle>(m_traits.m_style); }
  94     FontVariant variant() const { return static_cast<FontVariant>(m_traits.m_variant); }
  95     FontWeight weight() const { return static_cast<FontWeight>(m_traits.m_weight); }
  96     FontStretch stretch() const { return static_cast<FontStretch>(m_traits.m_stretch); }
  97     FontTraitsBitfield bitfield() const { return m_bitfield; }
  98
  99     union {
 100         struct {
 101             unsigned m_style : 2;
 102             unsigned m_variant : 1;
 103             unsigned m_weight : 4;
 104             unsigned m_stretch : 4;
 105             unsigned m_filler : 21;
 106         } m_traits;
 107         FontTraitsBitfield m_bitfield;
 108     };
 109 };
 110
 111 } // namespace blink
 112 #endif // FontTraits_h