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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "platform/text/Hyphenation.h" | 5 #include "platform/text/Hyphenation.h" |
6 | 6 |
7 #include "platform/fonts/Font.h" | 7 #include "platform/fonts/Font.h" |
8 #include "wtf/text/StringView.h" | 8 #include "wtf/text/StringView.h" |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 Vector<size_t, 8> Hyphenation::hyphenLocations(const StringView& text) const { | 12 Vector<size_t, 8> Hyphenation::hyphenLocations(const StringView& text) const { |
13 Vector<size_t, 8> hyphenLocations; | 13 Vector<size_t, 8> hyphenLocations; |
14 size_t hyphenLocation = text.length(); | 14 size_t hyphenLocation = text.length(); |
15 if (hyphenLocation <= minimumSuffixLength) | 15 if (hyphenLocation <= minimumSuffixLength) |
16 return hyphenLocations; | 16 return hyphenLocations; |
17 hyphenLocation -= minimumSuffixLength; | 17 hyphenLocation -= minimumSuffixLength; |
18 | 18 |
19 while ((hyphenLocation = lastHyphenLocation(text, hyphenLocation)) >= | 19 while ((hyphenLocation = lastHyphenLocation(text, hyphenLocation)) >= |
20 minimumPrefixLength) | 20 minimumPrefixLength) |
21 hyphenLocations.append(hyphenLocation); | 21 hyphenLocations.append(hyphenLocation); |
22 | 22 |
23 return hyphenLocations; | 23 return hyphenLocations; |
24 } | 24 } |
25 | 25 |
26 int Hyphenation::minimumPrefixWidth(const Font& font) { | 26 int Hyphenation::minimumPrefixWidth(const Font& font) { |
27 // If the maximum width available for the prefix before the hyphen is small, t
hen it is very unlikely | 27 // If the maximum width available for the prefix before the hyphen is small, |
28 // that an hyphenation opportunity exists, so do not bother to look for it. | 28 // then it is very unlikely that an hyphenation opportunity exists, so do not |
29 // These are heuristic numbers for performance added in http://wkb.ug/45606 | 29 // bother to look for it. These are heuristic numbers for performance added |
| 30 // in http://wkb.ug/45606 |
30 const int minimumPrefixWidthNumerator = 5; | 31 const int minimumPrefixWidthNumerator = 5; |
31 const int minimumPrefixWidthDenominator = 4; | 32 const int minimumPrefixWidthDenominator = 4; |
32 return font.getFontDescription().computedPixelSize() * | 33 return font.getFontDescription().computedPixelSize() * |
33 minimumPrefixWidthNumerator / minimumPrefixWidthDenominator; | 34 minimumPrefixWidthNumerator / minimumPrefixWidthDenominator; |
34 } | 35 } |
35 | 36 |
36 } // namespace blink | 37 } // namespace blink |
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