1/*
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
3 * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB.  If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 *
20 */
21
22#ifndef FontSize_h
23#define FontSize_h
24
25#include "core/CSSValueKeywords.h"
26#include "platform/fonts/FixedPitchFontType.h"
27
28namespace blink {
29
30class Document;
31
32enum ESmartMinimumForFontSize { DoNotUseSmartMinimumForFontSize, UseSmartMinimumForFontFize };
33
34class FontSize {
35private:
36    FontSize()
37    {
38    }
39
40public:
41    static float getComputedSizeFromSpecifiedSize(const Document*, float zoomFactor, bool isAbsoluteSize, float specifiedSize, ESmartMinimumForFontSize = UseSmartMinimumForFontFize);
42
43    // Given a CSS keyword in the range (xx-small to -webkit-xxx-large), this function returns
44    // values from '1' to '8'.
45    static unsigned keywordSize(CSSValueID valueID)
46    {
47        ASSERT(valueID >= CSSValueXxSmall && valueID <= CSSValueWebkitXxxLarge);
48        return valueID - CSSValueXxSmall + 1;
49    }
50
51    static unsigned initialKeywordSize() { return 4; } // CSSValueMedium
52
53    // Given a keyword size in the range (1 to 8), this function will return
54    // the correct font size scaled relative to the user's default (4).
55    static float fontSizeForKeyword(const Document*, unsigned keyword, FixedPitchFontType);
56
57    // Given a font size in pixel, this function will return legacy font size between 1 and 7.
58    static int legacyFontSize(const Document*, int pixelFontSize, FixedPitchFontType);
59};
60
61} // namespace blink
62
63#endif // FontSize_h
64