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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 "CaseMappingHarfBuzzBufferFiller.h" | 5 #include "CaseMappingHarfBuzzBufferFiller.h" |
6 | 6 |
7 #include "wtf/text/WTFString.h" | 7 #include "wtf/text/WTFString.h" |
8 | 8 |
9 namespace blink { | 9 namespace blink { |
10 | 10 |
11 static const uint16_t* toUint16(const UChar* src) | 11 static const uint16_t* toUint16(const UChar* src) |
12 { | 12 { |
13 // FIXME: This relies on undefined behavior however it works on the | 13 // FIXME: This relies on undefined behavior however it works on the |
14 // current versions of all compilers we care about and avoids making | 14 // current versions of all compilers we care about and avoids making |
15 // a copy of the string. | 15 // a copy of the string. |
16 static_assert(sizeof(UChar) == sizeof(uint16_t), "UChar should be the same s
ize as uint16_t"); | 16 static_assert(sizeof(UChar) == sizeof(uint16_t), "UChar should be the same s
ize as uint16_t"); |
17 return reinterpret_cast<const uint16_t*>(src); | 17 return reinterpret_cast<const uint16_t*>(src); |
18 } | 18 } |
19 | 19 |
20 | 20 |
21 CaseMappingHarfBuzzBufferFiller::CaseMappingHarfBuzzBufferFiller( | 21 CaseMappingHarfBuzzBufferFiller::CaseMappingHarfBuzzBufferFiller( |
22 CaseMapIntend caseMapIntend, | 22 CaseMapIntend caseMapIntend, |
| 23 AtomicString locale, |
23 hb_buffer_t* harfBuzzBuffer, | 24 hb_buffer_t* harfBuzzBuffer, |
24 const UChar* buffer, | 25 const UChar* buffer, |
25 unsigned bufferLength, | 26 unsigned bufferLength, |
26 unsigned startIndex, | 27 unsigned startIndex, |
27 unsigned numCharacters) | 28 unsigned numCharacters) |
28 : m_harfBuzzBuffer(harfBuzzBuffer) | 29 : m_harfBuzzBuffer(harfBuzzBuffer) |
29 { | 30 { |
30 | 31 |
31 if (caseMapIntend == CaseMapIntend::KeepSameCase) { | 32 if (caseMapIntend == CaseMapIntend::KeepSameCase) { |
32 hb_buffer_add_utf16(m_harfBuzzBuffer, | 33 hb_buffer_add_utf16(m_harfBuzzBuffer, |
33 toUint16(buffer), | 34 toUint16(buffer), |
34 bufferLength, | 35 bufferLength, |
35 startIndex, | 36 startIndex, |
36 numCharacters); | 37 numCharacters); |
37 } else { | 38 } else { |
38 String caseMappedText; | 39 String caseMappedText; |
39 if (caseMapIntend == CaseMapIntend::UpperCase) { | 40 if (caseMapIntend == CaseMapIntend::UpperCase) { |
40 caseMappedText = String(buffer, bufferLength).upper(); | 41 caseMappedText = String(buffer, bufferLength).upper(locale); |
41 } else { | 42 } else { |
42 caseMappedText = String(buffer, bufferLength).lower(); | 43 caseMappedText = String(buffer, bufferLength).lower(locale); |
43 } | 44 } |
44 // TODO(drott): crbug.com/589335 Implement those for the case where the | 45 |
45 // case-mapped string differs in length through one of the rule | 46 if (caseMappedText.length() != bufferLength) { |
46 // references in Unicode's SpecialCasing.txt | 47 fillSlowCase(caseMapIntend, locale, buffer, bufferLength, startIndex
, numCharacters); |
| 48 return; |
| 49 } |
47 | 50 |
48 ASSERT(caseMappedText.length() == bufferLength); | 51 ASSERT(caseMappedText.length() == bufferLength); |
49 ASSERT(!caseMappedText.is8Bit()); | 52 ASSERT(!caseMappedText.is8Bit()); |
50 hb_buffer_add_utf16(m_harfBuzzBuffer, toUint16(caseMappedText.characters
16()), | 53 hb_buffer_add_utf16(m_harfBuzzBuffer, toUint16(caseMappedText.characters
16()), |
51 bufferLength, startIndex, numCharacters); | 54 bufferLength, startIndex, numCharacters); |
52 } | 55 } |
53 } | 56 } |
54 | 57 |
| 58 // TODO(drott): crbug.com/623940 Fix lack of context sensitive case mapping here
. |
| 59 void CaseMappingHarfBuzzBufferFiller::fillSlowCase( |
| 60 CaseMapIntend caseMapIntend, |
| 61 AtomicString locale, |
| 62 const UChar* buffer, |
| 63 unsigned bufferLength, |
| 64 unsigned startIndex, |
| 65 unsigned numCharacters) |
| 66 { |
| 67 // Record pre-context. |
| 68 hb_buffer_add_utf16(m_harfBuzzBuffer, toUint16(buffer), bufferLength, startI
ndex, 0); |
| 69 |
| 70 for (unsigned charIndex = startIndex; charIndex < startIndex + numCharacters
;) { |
| 71 unsigned newCharIndex = charIndex; |
| 72 U16_FWD_1(buffer, newCharIndex, numCharacters); |
| 73 String charByChar(&buffer[charIndex], newCharIndex - charIndex); |
| 74 String caseMappedChar; |
| 75 if (caseMapIntend == CaseMapIntend::UpperCase) |
| 76 caseMappedChar = charByChar.upper(locale); |
| 77 else |
| 78 caseMappedChar = charByChar.lower(locale); |
| 79 |
| 80 for (unsigned j = 0; j < caseMappedChar.length();) { |
| 81 UChar32 codepoint = 0; |
| 82 U16_NEXT(caseMappedChar.characters16(), j, caseMappedChar.length(),
codepoint); |
| 83 // Add all characters of the case mapping result at the same cluster
position. |
| 84 hb_buffer_add(m_harfBuzzBuffer, codepoint, charIndex); |
| 85 } |
| 86 charIndex = newCharIndex; |
| 87 } |
| 88 |
| 89 // Record post-context |
| 90 hb_buffer_add_utf16(m_harfBuzzBuffer, toUint16(buffer), bufferLength, startI
ndex + numCharacters, 0); |
| 91 } |
| 92 |
55 } // namespace blink | 93 } // namespace blink |
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