1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
3 *
4 * This code is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License version 2 only, as
6 * published by the Free Software Foundation. Oracle designates this
7 * particular file as subject to the "Classpath" exception as provided
8 * by Oracle in the LICENSE file that accompanied this code.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 /*
27 *
28 * (C) Copyright IBM Corp and Others. 1998-2013 - All Rights Reserved
29 *
30 */
31
32 #include "LETypes.h"
33 #include "MorphTables.h"
34 #include "StateTables.h"
35 #include "MorphStateTables.h"
36 #include "SubtableProcessor2.h"
37 #include "StateTableProcessor2.h"
38 #include "LigatureSubstProc2.h"
39 #include "LEGlyphStorage.h"
40 #include "LESwaps.h"
41
42 U_NAMESPACE_BEGIN
43
44 #define ExtendedComplement(m) ((le_int32) (~((le_uint32) (m))))
45 #define SignBit(m) ((ExtendedComplement(m) >> 1) & (le_int32)(m))
46 #define SignExtend(v,m) (((v) & SignBit(m))? ((v) | ExtendedComplement(m)): (v))
47
48 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(LigatureSubstitutionProcessor2)
49
50 LigatureSubstitutionProcessor2::LigatureSubstitutionProcessor2(const LEReferenceTo<MorphSubtableHeader2> &morphSubtableHeader, LEErrorCode &success)
51 : StateTableProcessor2(morphSubtableHeader, success),
52 ligActionOffset(0),
53 ligatureSubstitutionHeader(morphSubtableHeader, success), componentOffset(0), ligatureOffset(0), entryTable()
54 {
55 if (LE_FAILURE(success)) return;
56
57 ligActionOffset = SWAPL(ligatureSubstitutionHeader->ligActionOffset);
58 componentOffset = SWAPL(ligatureSubstitutionHeader->componentOffset);
59 ligatureOffset = SWAPL(ligatureSubstitutionHeader->ligatureOffset);
60
61 entryTable = LEReferenceToArrayOf<LigatureSubstitutionStateEntry2>(stHeader, success, entryTableOffset, LE_UNBOUNDED_ARRAY);
62 }
63
64 LigatureSubstitutionProcessor2::~LigatureSubstitutionProcessor2()
65 {
66 }
67
68 void LigatureSubstitutionProcessor2::beginStateTable()
69 {
70 m = -1;
71 }
72
73 le_uint16 LigatureSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index, LEErrorCode &success)
74 {
75 const LigatureSubstitutionStateEntry2 *entry = entryTable.getAlias(index, success);
76 if(LE_FAILURE(success)) return 0;
77
78 le_uint16 nextStateIndex = SWAPW(entry->nextStateIndex);
79 le_uint16 flags = SWAPW(entry->entryFlags);
80 le_uint16 ligActionIndex = SWAPW(entry->ligActionIndex);
81
82 if (flags & lsfSetComponent) {
83 if (++m >= nComponents) {
84 m = 0;
85 }
86 componentStack[m] = currGlyph;
87 } else if ( m == -1) {
88 // bad font- skip this glyph.
89 //LE_DEBUG_BAD_FONT("m==-1 (componentCount went negative)")
90 currGlyph+= dir;
91 return nextStateIndex;
92 }
93
94 ByteOffset actionOffset = flags & lsfPerformAction;
95
96 if (actionOffset != 0) {
97 LEReferenceTo<LigatureActionEntry> ap(stHeader, success, ligActionOffset); // byte offset
98 if (LE_FAILURE(success)) {
99 currGlyph+= dir;
100 return nextStateIndex;
101 }
102 ap.addObject(ligActionIndex, success);
103 LEReferenceToArrayOf<TTGlyphID> ligatureTable(stHeader, success, ligatureOffset, LE_UNBOUNDED_ARRAY);
104 LigatureActionEntry action;
105 le_int32 offset, i = 0, j = 0;
106 le_int32 stack[nComponents];
107 le_int16 mm = -1;
108
109 LEReferenceToArrayOf<le_uint16> componentTable(stHeader, success, componentOffset, LE_UNBOUNDED_ARRAY);
110 if(LE_FAILURE(success)) {
111 currGlyph+= dir;
112 return nextStateIndex; // get out! bad font
113 }
114
115 do {
116 le_uint32 componentGlyph = componentStack[m--]; // pop off
117
118 if (j++ > 0) {
119 ap.addObject(success);
120 }
121 if (LE_FAILURE(success)) {
122 currGlyph+= dir;
123 return nextStateIndex;
124 }
125
126 action = SWAPL(*ap.getAlias());
127
128 if (m < 0) {
129 m = nComponents - 1;
130 }
131
132 offset = action & lafComponentOffsetMask;
133 if (offset != 0) {
134 if(componentGlyph >= glyphStorage.getGlyphCount()) {
135 LE_DEBUG_BAD_FONT("preposterous componentGlyph");
136 currGlyph+= dir;
137 return nextStateIndex; // get out! bad font
138 }
139 i += SWAPW(componentTable(LE_GET_GLYPH(glyphStorage[componentGlyph]) + (SignExtend(offset, lafComponentOffsetMask)),success));
140 if (LE_FAILURE(success)) {
141 currGlyph+= dir;
142 return nextStateIndex;
143 }
144
145 if (action & (lafLast | lafStore)) {
146 TTGlyphID ligatureGlyph = SWAPW(ligatureTable(i,success));
147 if (LE_FAILURE(success)) {
148 currGlyph+= dir;
149 return nextStateIndex;
150 }
151 glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], ligatureGlyph);
152 if(mm==nComponents) {
153 LE_DEBUG_BAD_FONT("exceeded nComponents");
154 mm--; // don't overrun the stack.
155 }
156 stack[++mm] = componentGlyph;
157 i = 0;
158 } else {
159 glyphStorage[componentGlyph] = LE_SET_GLYPH(glyphStorage[componentGlyph], 0xFFFF);
160 }
161 }
162 #if LE_ASSERT_BAD_FONT
163 if(m<0) {
164 LE_DEBUG_BAD_FONT("m<0")
165 }
166 #endif
167 } while (LE_SUCCESS(success) && !(action & lafLast) && (m>=0) ); // stop if last bit is set, or if run out of items
168
169 while (mm >= 0) {
170 if (++m >= nComponents) {
171 m = 0;
172 }
173
174 componentStack[m] = stack[mm--];
175 }
176 }
177
178 if (!(flags & lsfDontAdvance)) {
179 currGlyph += dir;
180 }
181
182 return nextStateIndex;
183 }
184
185 void LigatureSubstitutionProcessor2::endStateTable()
186 {
187 }
188
189 U_NAMESPACE_END