Source/core/platform/graphics/FontMetrics.h - Issue 48113009: Move Font related classes to Source/platform/fonts

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Issue 48113009: Move Font related classes to Source/platform/fonts (Closed) Base URL: https://chromium.googlesource.com/chromium/blink.git@master

Patch Set: Add two more Font related independent files Created 7 years, 1 month ago

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1 /*

2 * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.

3 *

4 * This library is free software; you can redistribute it and/or

5 * modify it under the terms of the GNU Library General Public

6 * License as published by the Free Software Foundation; either

7 * version 2 of the License, or (at your option) any later version.

8 *

9 * This library is distributed in the hope that it will be useful,

10 * but WITHOUT ANY WARRANTY; without even the implied warranty of

11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

12 * Library General Public License for more details.

13 *

14 * You should have received a copy of the GNU Library General Public License

15 * along with this library; see the file COPYING.LIB. If not, write to

16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

17 * Boston, MA 02110-1301, USA.

18 */

19

20 #ifndef FontMetrics_h

21 #define FontMetrics_h

22

23 #include "platform/fonts/FontBaseline.h"

24 #include "wtf/MathExtras.h"

25

26 namespace WebCore {

27

28 const unsigned gDefaultUnitsPerEm = 1000;

29

30 class FontMetrics {

31 public:

32 FontMetrics()

33 : m_unitsPerEm(gDefaultUnitsPerEm)

34 , m_ascent(0)

35 , m_descent(0)

36 , m_lineGap(0)

37 , m_lineSpacing(0)

38 , m_xHeight(0)

39 , m_zeroWidth(0)

40 , m_hasXHeight(false)

41 , m_hasZeroWidth(false)

42 {

43 }

44

45 unsigned unitsPerEm() const { return m_unitsPerEm; }

46 void setUnitsPerEm(unsigned unitsPerEm) { m_unitsPerEm = unitsPerEm; }

47

48 float floatAscent(FontBaseline baselineType = AlphabeticBaseline) const

49 {

50 if (baselineType == AlphabeticBaseline)

51 return m_ascent;

52 return floatHeight() / 2;

53 }

54

55 void setAscent(float ascent) { m_ascent = ascent; }

56

57 float floatDescent(FontBaseline baselineType = AlphabeticBaseline) const

58 {

59 if (baselineType == AlphabeticBaseline)

60 return m_descent;

61 return floatHeight() / 2;

62 }

63

64 void setDescent(float descent) { m_descent = descent; }

65

66 float floatHeight(FontBaseline baselineType = AlphabeticBaseline) const

67 {

68 return floatAscent(baselineType) + floatDescent(baselineType);

69 }

70

71 float floatLineGap() const { return m_lineGap; }

72 void setLineGap(float lineGap) { m_lineGap = lineGap; }

73

74 float floatLineSpacing() const { return m_lineSpacing; }

75 void setLineSpacing(float lineSpacing) { m_lineSpacing = lineSpacing; }

76

77 float xHeight() const { return m_xHeight; }

78 void setXHeight(float xHeight)

79 {

80 m_xHeight = xHeight;

81 m_hasXHeight = true;

82 }

83

84 bool hasXHeight() const { return m_hasXHeight && m_xHeight > 0; }

85 void setHasXHeight(bool hasXHeight) { m_hasXHeight = hasXHeight; }

86

87 // Integer variants of certain metrics, used for HTML rendering.

88 int ascent(FontBaseline baselineType = AlphabeticBaseline) const

89 {

90 if (baselineType == AlphabeticBaseline)

91 return lroundf(m_ascent);

92 return height() - height() / 2;

93 }

94

95 int descent(FontBaseline baselineType = AlphabeticBaseline) const

96 {

97 if (baselineType == AlphabeticBaseline)

98 return lroundf(m_descent);

99 return height() / 2;

100 }

101

102 int height(FontBaseline baselineType = AlphabeticBaseline) const

103 {

104 return ascent(baselineType) + descent(baselineType);

105 }

106

107 int lineGap() const { return lroundf(m_lineGap); }

108 int lineSpacing() const { return lroundf(m_lineSpacing); }

109

110 bool hasIdenticalAscentDescentAndLineGap(const FontMetrics& other) const

111 {

112 return ascent() == other.ascent() && descent() == other.descent() && lin eGap() == other.lineGap();

113 }

114

115 float zeroWidth() const { return m_zeroWidth; }

116 void setZeroWidth(float zeroWidth)

117 {

118 m_zeroWidth = zeroWidth;

119 m_hasZeroWidth = true;

120 }

121

122 bool hasZeroWidth() const { return m_hasZeroWidth; }

123 void setHasZeroWidth(bool hasZeroWidth) { m_hasZeroWidth = hasZeroWidth; }

124

125 private:

126 friend class SimpleFontData;

127

128 void reset()

129 {

130 m_unitsPerEm = gDefaultUnitsPerEm;

131 m_ascent = 0;

132 m_descent = 0;

133 m_lineGap = 0;

134 m_lineSpacing = 0;

135 m_xHeight = 0;

136 m_hasXHeight = false;

137 }

138

139 unsigned m_unitsPerEm;

140 float m_ascent;

141 float m_descent;

142 float m_lineGap;

143 float m_lineSpacing;

144 float m_xHeight;

145 float m_zeroWidth;

146 bool m_hasXHeight;

147 bool m_hasZeroWidth;

148 };

149

150 static inline float scaleEmToUnits(float x, unsigned unitsPerEm)

151 {

152 return unitsPerEm ? x / unitsPerEm : x;

153 }

154

155 } // namespace WebCore

156

157 #endif // FontMetrics_h

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