1 /*
2 * Copyright (C) 2013 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 * * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #include "third_party/blink/renderer/core/layout/text_run_constructor.h"
32
33 #include "third_party/blink/renderer/core/layout/api/line_layout_item.h"
34 #include "third_party/blink/renderer/core/layout/api/line_layout_text.h"
35 #include "third_party/blink/renderer/core/layout/layout_text.h"
36 #include "third_party/blink/renderer/platform/text/bidi_text_run.h"
37
38 namespace blink {
39
40 template <typename CharacterType>
ConstructTextRunInternal(const Font & font,const CharacterType * characters,int length,const ComputedStyle & style,TextDirection direction)41 static inline TextRun ConstructTextRunInternal(const Font& font,
42 const CharacterType* characters,
43 int length,
44 const ComputedStyle& style,
45 TextDirection direction) {
46 TextRun::ExpansionBehavior expansion =
47 TextRun::kAllowTrailingExpansion | TextRun::kForbidLeadingExpansion;
48 bool directional_override = style.RtlOrdering() == EOrder::kVisual;
49 TextRun run(characters, length, 0, 0, expansion, direction,
50 directional_override);
51 return run;
52 }
53
54 template <typename CharacterType>
ConstructTextRunInternal(const Font & font,const CharacterType * characters,int length,const ComputedStyle & style,TextDirection direction,TextRunFlags flags)55 static inline TextRun ConstructTextRunInternal(const Font& font,
56 const CharacterType* characters,
57 int length,
58 const ComputedStyle& style,
59 TextDirection direction,
60 TextRunFlags flags) {
61 TextDirection text_direction = direction;
62 bool directional_override = style.RtlOrdering() == EOrder::kVisual;
63 if (flags != kDefaultTextRunFlags) {
64 if (flags & kRespectDirection)
65 text_direction = style.Direction();
66 if (flags & kRespectDirectionOverride)
67 directional_override |= IsOverride(style.GetUnicodeBidi());
68 }
69
70 TextRun::ExpansionBehavior expansion =
71 TextRun::kAllowTrailingExpansion | TextRun::kForbidLeadingExpansion;
72 TextRun run(characters, length, 0, 0, expansion, text_direction,
73 directional_override);
74 return run;
75 }
76
ConstructTextRun(const Font & font,const LChar * characters,int length,const ComputedStyle & style,TextDirection direction)77 TextRun ConstructTextRun(const Font& font,
78 const LChar* characters,
79 int length,
80 const ComputedStyle& style,
81 TextDirection direction) {
82 return ConstructTextRunInternal(font, characters, length, style, direction);
83 }
84
ConstructTextRun(const Font & font,const UChar * characters,int length,const ComputedStyle & style,TextDirection direction)85 TextRun ConstructTextRun(const Font& font,
86 const UChar* characters,
87 int length,
88 const ComputedStyle& style,
89 TextDirection direction) {
90 return ConstructTextRunInternal(font, characters, length, style, direction);
91 }
92
ConstructTextRun(const Font & font,const LayoutText * text,unsigned offset,unsigned length,const ComputedStyle & style,TextDirection direction)93 TextRun ConstructTextRun(const Font& font,
94 const LayoutText* text,
95 unsigned offset,
96 unsigned length,
97 const ComputedStyle& style,
98 TextDirection direction) {
99 DCHECK_LE(offset + length, text->TextLength());
100 if (text->HasEmptyText())
101 return ConstructTextRunInternal(font, static_cast<const LChar*>(nullptr), 0,
102 style, direction);
103 if (text->Is8Bit())
104 return ConstructTextRunInternal(font, text->Characters8() + offset, length,
105 style, direction);
106 return ConstructTextRunInternal(font, text->Characters16() + offset, length,
107 style, direction);
108 }
109
ConstructTextRun(const Font & font,const String & string,const ComputedStyle & style,TextDirection direction,TextRunFlags flags)110 TextRun ConstructTextRun(const Font& font,
111 const String& string,
112 const ComputedStyle& style,
113 TextDirection direction,
114 TextRunFlags flags) {
115 unsigned length = string.length();
116 if (!length)
117 return ConstructTextRunInternal(font, static_cast<const LChar*>(nullptr),
118 length, style, direction, flags);
119 if (string.Is8Bit())
120 return ConstructTextRunInternal(font, string.Characters8(), length, style,
121 direction, flags);
122 return ConstructTextRunInternal(font, string.Characters16(), length, style,
123 direction, flags);
124 }
125
ConstructTextRun(const Font & font,const String & string,const ComputedStyle & style,TextRunFlags flags)126 TextRun ConstructTextRun(const Font& font,
127 const String& string,
128 const ComputedStyle& style,
129 TextRunFlags flags) {
130 return ConstructTextRun(font, string, style,
131 string.IsEmpty() || string.Is8Bit()
132 ? TextDirection::kLtr
133 : DetermineDirectionality(string),
134 flags);
135 }
136
ConstructTextRun(const Font & font,const LineLayoutText text,unsigned offset,unsigned length,const ComputedStyle & style)137 TextRun ConstructTextRun(const Font& font,
138 const LineLayoutText text,
139 unsigned offset,
140 unsigned length,
141 const ComputedStyle& style) {
142 SECURITY_DCHECK(offset + length <= text.TextLength());
143 if (text.HasEmptyText()) {
144 return ConstructTextRunInternal(font, static_cast<const LChar*>(nullptr), 0,
145 style, TextDirection::kLtr);
146 }
147 if (text.Is8Bit()) {
148 return ConstructTextRunInternal(font, text.Characters8() + offset, length,
149 style, TextDirection::kLtr);
150 }
151
152 TextRun run = ConstructTextRunInternal(font, text.Characters16() + offset,
153 length, style, TextDirection::kLtr);
154 run.SetDirection(DirectionForRun(run));
155 return run;
156 }
157
158 } // namespace blink
159