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Side by Side Diff: Source/platform/fonts/SVGGlyph.cpp

Issue 656913006: Remove SVG fonts (Closed) Base URL: svn://svn.chromium.org/blink/trunk
Patch Set: Created 6 years, 2 months ago
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1 /*
2 * Copyright (C) 2007, 2008 Nikolas Zimmermann <zimmermann@kde.org>
3 * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public License
16 * along with this library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301, USA.
19 */
20
21 #include "config.h"
22
23 #if ENABLE(SVG_FONTS)
24 #include "platform/fonts/SVGGlyph.h"
25
26 #include "wtf/unicode/Unicode.h"
27
28 using namespace WTF::Unicode;
29
30 namespace blink {
31
32 // Helper functions to determine the arabic character forms (initial, medial, te rminal, isolated)
33 enum ArabicCharShapingMode {
34 SNone = 0,
35 SRight = 1,
36 SDual = 2
37 };
38
39 static const ArabicCharShapingMode s_arabicCharShapingMode[222] = {
40 SRight, SRight, SRight, SRight, SDual , SRight, SDual , SRight, SDual , SDua l , SDual , SDual , SDual , SRight, /* 0x0622 - 0x062F */
41 SRight, SRight, SRight, SDual , SDual , SDual , SDual , SDual , SDual , SDua l , SDual , SNone , SNone , SNone , SNone , SNone , /* 0x0630 - 0x063F */
42 SNone , SDual , SDual , SDual , SDual , SDual , SDual , SRight, SDual , SDua l , SNone , SNone , SNone , SNone , SNone , SNone , /* 0x0640 - 0x064F */
43 SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNon e , SNone , SNone , SNone , SNone , SNone , SNone , /* 0x0650 - 0x065F */
44 SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNon e , SNone , SNone , SNone , SNone , SNone , SNone , /* 0x0660 - 0x066F */
45 SNone , SRight, SRight, SRight, SNone , SRight, SRight, SRight, SDual , SDua l , SDual , SDual , SDual , SDual , SDual , SDual , /* 0x0670 - 0x067F */
46 SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDual , SRight, SRig ht, SRight, SRight, SRight, SRight, SRight, SRight, /* 0x0680 - 0x068F */
47 SRight, SRight, SRight, SRight, SRight, SRight, SRight, SRight, SRight, SRig ht, SDual , SDual , SDual , SDual , SDual , SDual , /* 0x0690 - 0x069F */
48 SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDua l , SDual , SDual , SDual , SDual , SDual , SDual , /* 0x06A0 - 0x06AF */
49 SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDual , SDua l , SDual , SDual , SDual , SDual , SDual , SDual , /* 0x06B0 - 0x06BF */
50 SRight, SDual , SRight, SRight, SRight, SRight, SRight, SRight, SRight, SRig ht, SRight, SRight, SDual , SRight, SDual , SRight, /* 0x06C0 - 0x06CF */
51 SDual , SDual , SRight, SRight, SNone , SNone , SNone , SNone , SNone , SNon e , SNone , SNone , SNone , SNone , SNone , SNone , /* 0x06D0 - 0x06DF */
52 SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNon e , SNone , SNone , SNone , SNone , SNone , SNone , /* 0x06E0 - 0x06EF */
53 SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNone , SNon e , SDual , SDual , SDual , SNone , SNone , SNone /* 0x06F0 - 0x06FF */
54 };
55
56 static inline SVGGlyph::ArabicForm processArabicFormDetection(const UChar& curCh ar, bool& lastCharShapesRight, SVGGlyph::ArabicForm* prevForm)
57 {
58 SVGGlyph::ArabicForm curForm;
59
60 ArabicCharShapingMode shapingMode = SNone;
61 if (curChar >= 0x0622 && curChar <= 0x06FF)
62 shapingMode = s_arabicCharShapingMode[curChar - 0x0622];
63
64 // Use a simple state machine to identify the actual arabic form
65 // It depends on the order of the arabic form enum:
66 // enum ArabicForm { None = 0, Isolated, Terminal, Initial, Medial };
67
68 if (lastCharShapesRight && shapingMode == SDual) {
69 if (prevForm) {
70 int correctedForm = (int) *prevForm + 1;
71 ASSERT(correctedForm >= SVGGlyph::None && correctedForm <= SVGGlyph: :Medial);
72 *prevForm = static_cast<SVGGlyph::ArabicForm>(correctedForm);
73 }
74
75 curForm = SVGGlyph::Initial;
76 } else
77 curForm = shapingMode == SNone ? SVGGlyph::None : SVGGlyph::Isolated;
78
79 lastCharShapesRight = shapingMode != SNone;
80 return curForm;
81 }
82
83 Vector<SVGGlyph::ArabicForm> charactersWithArabicForm(const String& input, bool rtl)
84 {
85 Vector<SVGGlyph::ArabicForm> forms;
86 unsigned length = input.length();
87
88 bool containsArabic = false;
89 for (unsigned i = 0; i < length; ++i) {
90 if (isArabicChar(input[i])) {
91 containsArabic = true;
92 break;
93 }
94 }
95
96 if (!containsArabic)
97 return forms;
98
99 bool lastCharShapesRight = false;
100
101 // Start identifying arabic forms
102 if (rtl) {
103 for (int i = length - 1; i >= 0; --i)
104 forms.prepend(processArabicFormDetection(input[i], lastCharShapesRig ht, forms.isEmpty() ? 0 : &forms.first()));
105 } else {
106 for (unsigned i = 0; i < length; ++i)
107 forms.append(processArabicFormDetection(input[i], lastCharShapesRigh t, forms.isEmpty() ? 0 : &forms.last()));
108 }
109
110 return forms;
111 }
112
113 static inline bool isCompatibleArabicForm(const SVGGlyph& identifier, const Vect or<SVGGlyph::ArabicForm>& chars, unsigned startPosition, unsigned endPosition)
114 {
115 if (chars.isEmpty())
116 return true;
117
118 Vector<SVGGlyph::ArabicForm>::const_iterator realEnd = chars.end();
119 Vector<SVGGlyph::ArabicForm>::const_iterator it = chars.begin() + startPosit ion;
120 if (it >= realEnd)
121 return true;
122
123 Vector<SVGGlyph::ArabicForm>::const_iterator end = chars.begin() + endPositi on;
124 if (end >= realEnd)
125 end = realEnd;
126
127 for (; it != end; ++it) {
128 if (*it != static_cast<SVGGlyph::ArabicForm>(identifier.arabicForm) && * it != SVGGlyph::None)
129 return false;
130 }
131
132 return true;
133 }
134
135 bool isCompatibleGlyph(const SVGGlyph& identifier, bool isVerticalText, const St ring& language,
136 const Vector<SVGGlyph::ArabicForm>& chars, unsigned start Position, unsigned endPosition)
137 {
138 bool valid = true;
139
140 // Check wheter orientation if glyph fits within the request
141 switch (identifier.orientation) {
142 case SVGGlyph::Vertical:
143 valid = isVerticalText;
144 break;
145 case SVGGlyph::Horizontal:
146 valid = !isVerticalText;
147 break;
148 case SVGGlyph::Both:
149 break;
150 }
151
152 if (!valid)
153 return false;
154
155 // Check wheter languages are compatible
156 if (!identifier.languages.isEmpty()) {
157 // This glyph exists only in certain languages, if we're not specifying a
158 // language on the referencing element we're unable to use this glyph.
159 if (language.isEmpty())
160 return false;
161
162 // Split subcode from language, if existant.
163 String languagePrefix;
164
165 size_t subCodeSeparator = language.find('-');
166 if (subCodeSeparator != kNotFound)
167 languagePrefix = language.left(subCodeSeparator);
168
169 Vector<String>::const_iterator it = identifier.languages.begin();
170 Vector<String>::const_iterator end = identifier.languages.end();
171
172 bool found = false;
173 for (; it != end; ++it) {
174 const String& cur = *it;
175 if (cur == language || cur == languagePrefix) {
176 found = true;
177 break;
178 }
179 }
180
181 if (!found)
182 return false;
183 }
184
185 // Check wheter arabic form is compatible
186 return isCompatibleArabicForm(identifier, chars, startPosition, endPosition) ;
187 }
188
189 } // namespace blink
190
191 #endif
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