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1 /* | 1 /* |
2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) | 2 * Copyright (C) 1999 Lars Knoll (knoll@kde.org) |
3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com) | 3 * (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com) |
4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com) | 4 * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com) |
5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc.
All rights reserved. | 5 * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple Inc. |
| 6 * All rights reserved. |
6 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> | 7 * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org> |
7 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org> | 8 * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org> |
8 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.t
orchmobile.com/) | 9 * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. |
| 10 * (http://www.torchmobile.com/) |
9 * Copyright (c) 2011, Code Aurora Forum. All rights reserved. | 11 * Copyright (c) 2011, Code Aurora Forum. All rights reserved. |
10 * Copyright (C) Research In Motion Limited 2011. All rights reserved. | 12 * Copyright (C) Research In Motion Limited 2011. All rights reserved. |
11 * Copyright (C) 2012 Google Inc. All rights reserved. | 13 * Copyright (C) 2012 Google Inc. All rights reserved. |
12 * | 14 * |
13 * This library is free software; you can redistribute it and/or | 15 * This library is free software; you can redistribute it and/or |
14 * modify it under the terms of the GNU Library General Public | 16 * modify it under the terms of the GNU Library General Public |
15 * License as published by the Free Software Foundation; either | 17 * License as published by the Free Software Foundation; either |
16 * version 2 of the License, or (at your option) any later version. | 18 * version 2 of the License, or (at your option) any later version. |
17 * | 19 * |
18 * This library is distributed in the hope that it will be useful, | 20 * This library is distributed in the hope that it will be useful, |
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40 bool isAbsoluteSize, | 42 bool isAbsoluteSize, |
41 float specifiedSize, | 43 float specifiedSize, |
42 ESmartMinimumForFontSize useSmartMinimumForFontSize) { | 44 ESmartMinimumForFontSize useSmartMinimumForFontSize) { |
43 // Text with a 0px font size should not be visible and therefore needs to be | 45 // Text with a 0px font size should not be visible and therefore needs to be |
44 // exempt from minimum font size rules. Acid3 relies on this for pixel-perfect | 46 // exempt from minimum font size rules. Acid3 relies on this for pixel-perfect |
45 // rendering. This is also compatible with other browsers that have minimum | 47 // rendering. This is also compatible with other browsers that have minimum |
46 // font size settings (e.g. Firefox). | 48 // font size settings (e.g. Firefox). |
47 if (fabsf(specifiedSize) < std::numeric_limits<float>::epsilon()) | 49 if (fabsf(specifiedSize) < std::numeric_limits<float>::epsilon()) |
48 return 0.0f; | 50 return 0.0f; |
49 | 51 |
50 // We support two types of minimum font size. The first is a hard override tha
t applies to | 52 // We support two types of minimum font size. The first is a hard override |
51 // all fonts. This is "minSize." The second type of minimum font size is a "sm
art minimum" | 53 // that applies to all fonts. This is "minSize." The second type of minimum |
52 // that is applied only when the Web page can't know what size it really asked
for, e.g., | 54 // font size is a "smart minimum" that is applied only when the Web page can't |
53 // when it uses logical sizes like "small" or expresses the font-size as a per
centage of | 55 // know what size it really asked for, e.g., when it uses logical sizes like |
54 // the user's default font setting. | 56 // "small" or expresses the font-size as a percentage of the user's default |
| 57 // font setting. |
55 | 58 |
56 // With the smart minimum, we never want to get smaller than the minimum font
size to keep fonts readable. | 59 // With the smart minimum, we never want to get smaller than the minimum font |
57 // However we always allow the page to set an explicit pixel size that is smal
ler, | 60 // size to keep fonts readable. However we always allow the page to set an |
58 // since sites will mis-render otherwise (e.g., http://www.gamespot.com with a
9px minimum). | 61 // explicit pixel size that is smaller, since sites will mis-render otherwise |
| 62 // (e.g., http://www.gamespot.com with a 9px minimum). |
59 | 63 |
60 Settings* settings = document->settings(); | 64 Settings* settings = document->settings(); |
61 if (!settings) | 65 if (!settings) |
62 return 1.0f; | 66 return 1.0f; |
63 | 67 |
64 int minSize = settings->minimumFontSize(); | 68 int minSize = settings->minimumFontSize(); |
65 int minLogicalSize = settings->minimumLogicalFontSize(); | 69 int minLogicalSize = settings->minimumLogicalFontSize(); |
66 float zoomedSize = specifiedSize * zoomFactor; | 70 float zoomedSize = specifiedSize * zoomFactor; |
67 | 71 |
68 // Apply the hard minimum first. We only apply the hard minimum if after zoomi
ng we're still too small. | 72 // Apply the hard minimum first. We only apply the hard minimum if after |
| 73 // zooming we're still too small. |
69 if (zoomedSize < minSize) | 74 if (zoomedSize < minSize) |
70 zoomedSize = minSize; | 75 zoomedSize = minSize; |
71 | 76 |
72 // Now apply the "smart minimum." This minimum is also only applied if we're s
till too small | 77 // Now apply the "smart minimum." This minimum is also only applied if we're |
73 // after zooming. The font size must either be relative to the user default or
the original size | 78 // still too small after zooming. The font size must either be relative to the |
74 // must have been acceptable. In other words, we only apply the smart minimum
whenever we're positive | 79 // user default or the original size must have been acceptable. In other |
75 // doing so won't disrupt the layout. | 80 // words, we only apply the smart minimum whenever we're positive doing so |
| 81 // won't disrupt the layout. |
76 if (useSmartMinimumForFontSize && zoomedSize < minLogicalSize && | 82 if (useSmartMinimumForFontSize && zoomedSize < minLogicalSize && |
77 (specifiedSize >= minLogicalSize || !isAbsoluteSize)) | 83 (specifiedSize >= minLogicalSize || !isAbsoluteSize)) |
78 zoomedSize = minLogicalSize; | 84 zoomedSize = minLogicalSize; |
79 | 85 |
80 // Also clamp to a reasonable maximum to prevent insane font sizes from causin
g crashes on various | 86 // Also clamp to a reasonable maximum to prevent insane font sizes from |
81 // platforms (I'm looking at you, Windows.) | 87 // causing crashes on various platforms (I'm looking at you, Windows.) |
82 return std::min(maximumAllowedFontSize, zoomedSize); | 88 return std::min(maximumAllowedFontSize, zoomedSize); |
83 } | 89 } |
84 | 90 |
85 const int fontSizeTableMax = 16; | 91 const int fontSizeTableMax = 16; |
86 const int fontSizeTableMin = 9; | 92 const int fontSizeTableMin = 9; |
87 const int totalKeywords = 8; | 93 const int totalKeywords = 8; |
88 | 94 |
89 // WinIE/Nav4 table for font sizes. Designed to match the legacy font mapping sy
stem of HTML. | 95 // WinIE/Nav4 table for font sizes. Designed to match the legacy font mapping |
| 96 // system of HTML. |
90 static const int quirksFontSizeTable[fontSizeTableMax - fontSizeTableMin + | 97 static const int quirksFontSizeTable[fontSizeTableMax - fontSizeTableMin + |
91 1][totalKeywords] = { | 98 1][totalKeywords] = { |
92 {9, 9, 9, 9, 11, 14, 18, 28}, {9, 9, 9, 10, 12, 15, 20, 31}, | 99 {9, 9, 9, 9, 11, 14, 18, 28}, {9, 9, 9, 10, 12, 15, 20, 31}, |
93 {9, 9, 9, 11, 13, 17, 22, 34}, {9, 9, 10, 12, 14, 18, 24, 37}, | 100 {9, 9, 9, 11, 13, 17, 22, 34}, {9, 9, 10, 12, 14, 18, 24, 37}, |
94 {9, 9, 10, 13, 16, 20, 26, 40}, // fixed font default (13) | 101 {9, 9, 10, 13, 16, 20, 26, 40}, // fixed font default (13) |
95 {9, 9, 11, 14, 17, 21, 28, 42}, {9, 10, 12, 15, 17, 23, 30, 45}, | 102 {9, 9, 11, 14, 17, 21, 28, 42}, {9, 10, 12, 15, 17, 23, 30, 45}, |
96 {9, 10, 13, 16, 18, 24, 32, 48} // proportional font default (16) | 103 {9, 10, 13, 16, 18, 24, 32, 48} // proportional font default (16) |
97 }; | 104 }; |
98 // HTML 1 2 3 4 5 6 7 | 105 // HTML 1 2 3 4 5 6 7 |
99 // CSS xxs xs s m l xl xxl | 106 // CSS xxs xs s m l xl xxl |
100 // | | 107 // | |
101 // user pref | 108 // user pref |
102 | 109 |
103 // Strict mode table matches MacIE and Mozilla's settings exactly. | 110 // Strict mode table matches MacIE and Mozilla's settings exactly. |
104 static const int strictFontSizeTable[fontSizeTableMax - fontSizeTableMin + | 111 static const int strictFontSizeTable[fontSizeTableMax - fontSizeTableMin + |
105 1][totalKeywords] = { | 112 1][totalKeywords] = { |
106 {9, 9, 9, 9, 11, 14, 18, 27}, {9, 9, 9, 10, 12, 15, 20, 30}, | 113 {9, 9, 9, 9, 11, 14, 18, 27}, {9, 9, 9, 10, 12, 15, 20, 30}, |
107 {9, 9, 10, 11, 13, 17, 22, 33}, {9, 9, 10, 12, 14, 18, 24, 36}, | 114 {9, 9, 10, 11, 13, 17, 22, 33}, {9, 9, 10, 12, 14, 18, 24, 36}, |
108 {9, 10, 12, 13, 16, 20, 26, 39}, // fixed font default (13) | 115 {9, 10, 12, 13, 16, 20, 26, 39}, // fixed font default (13) |
109 {9, 10, 12, 14, 17, 21, 28, 42}, {9, 10, 13, 15, 18, 23, 30, 45}, | 116 {9, 10, 12, 14, 17, 21, 28, 42}, {9, 10, 13, 15, 18, 23, 30, 45}, |
110 {9, 10, 13, 16, 18, 24, 32, 48} // proportional font default (16) | 117 {9, 10, 13, 16, 18, 24, 32, 48} // proportional font default (16) |
111 }; | 118 }; |
112 // HTML 1 2 3 4 5 6 7 | 119 // HTML 1 2 3 4 5 6 7 |
113 // CSS xxs xs s m l xl xxl | 120 // CSS xxs xs s m l xl xxl |
114 // | | 121 // | |
115 // user pref | 122 // user pref |
116 | 123 |
117 // For values outside the range of the table, we use Todd Fahrner's suggested sc
ale | 124 // For values outside the range of the table, we use Todd Fahrner's suggested |
118 // factors for each keyword value. | 125 // scale factors for each keyword value. |
119 static const float fontSizeFactors[totalKeywords] = {0.60f, 0.75f, 0.89f, 1.0f, | 126 static const float fontSizeFactors[totalKeywords] = {0.60f, 0.75f, 0.89f, 1.0f, |
120 1.2f, 1.5f, 2.0f, 3.0f}; | 127 1.2f, 1.5f, 2.0f, 3.0f}; |
121 | 128 |
122 static int inline rowFromMediumFontSizeInRange(const Settings* settings, | 129 static int inline rowFromMediumFontSizeInRange(const Settings* settings, |
123 bool quirksMode, | 130 bool quirksMode, |
124 bool isMonospace, | 131 bool isMonospace, |
125 int& mediumSize) { | 132 int& mediumSize) { |
126 mediumSize = isMonospace ? settings->defaultFixedFontSize() | 133 mediumSize = isMonospace ? settings->defaultFixedFontSize() |
127 : settings->defaultFontSize(); | 134 : settings->defaultFontSize(); |
128 if (mediumSize >= fontSizeTableMin && mediumSize <= fontSizeTableMax) | 135 if (mediumSize >= fontSizeTableMin && mediumSize <= fontSizeTableMax) |
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150 | 157 |
151 // Value is outside the range of the table. Apply the scale factor instead. | 158 // Value is outside the range of the table. Apply the scale factor instead. |
152 float minLogicalSize = std::max(settings->minimumLogicalFontSize(), 1); | 159 float minLogicalSize = std::max(settings->minimumLogicalFontSize(), 1); |
153 return std::max(fontSizeFactors[keyword - 1] * mediumSize, minLogicalSize); | 160 return std::max(fontSizeFactors[keyword - 1] * mediumSize, minLogicalSize); |
154 } | 161 } |
155 | 162 |
156 template <typename T> | 163 template <typename T> |
157 static int findNearestLegacyFontSize(int pixelFontSize, | 164 static int findNearestLegacyFontSize(int pixelFontSize, |
158 const T* table, | 165 const T* table, |
159 int multiplier) { | 166 int multiplier) { |
160 // Ignore table[0] because xx-small does not correspond to any legacy font siz
e. | 167 // Ignore table[0] because xx-small does not correspond to any legacy font |
| 168 // size. |
161 for (int i = 1; i < totalKeywords - 1; i++) { | 169 for (int i = 1; i < totalKeywords - 1; i++) { |
162 if (pixelFontSize * 2 < (table[i] + table[i + 1]) * multiplier) | 170 if (pixelFontSize * 2 < (table[i] + table[i + 1]) * multiplier) |
163 return i; | 171 return i; |
164 } | 172 } |
165 return totalKeywords - 1; | 173 return totalKeywords - 1; |
166 } | 174 } |
167 | 175 |
168 int FontSize::legacyFontSize(const Document* document, | 176 int FontSize::legacyFontSize(const Document* document, |
169 int pixelFontSize, | 177 int pixelFontSize, |
170 bool isMonospace) { | 178 bool isMonospace) { |
171 const Settings* settings = document->settings(); | 179 const Settings* settings = document->settings(); |
172 if (!settings) | 180 if (!settings) |
173 return 1; | 181 return 1; |
174 | 182 |
175 bool quirksMode = document->inQuirksMode(); | 183 bool quirksMode = document->inQuirksMode(); |
176 int mediumSize = 0; | 184 int mediumSize = 0; |
177 int row = rowFromMediumFontSizeInRange(settings, quirksMode, isMonospace, | 185 int row = rowFromMediumFontSizeInRange(settings, quirksMode, isMonospace, |
178 mediumSize); | 186 mediumSize); |
179 if (row >= 0) | 187 if (row >= 0) |
180 return findNearestLegacyFontSize<int>( | 188 return findNearestLegacyFontSize<int>( |
181 pixelFontSize, | 189 pixelFontSize, |
182 quirksMode ? quirksFontSizeTable[row] : strictFontSizeTable[row], 1); | 190 quirksMode ? quirksFontSizeTable[row] : strictFontSizeTable[row], 1); |
183 | 191 |
184 return findNearestLegacyFontSize<float>(pixelFontSize, fontSizeFactors, | 192 return findNearestLegacyFontSize<float>(pixelFontSize, fontSizeFactors, |
185 mediumSize); | 193 mediumSize); |
186 } | 194 } |
187 | 195 |
188 } // namespace blink | 196 } // namespace blink |
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