1 /*
2 *
3 * (C) Copyright IBM Corp. 2002-2008 - All Rights Reserved
4 *
5 */
6
7 #include "LETypes.h"
8 #include "LEGlyphStorage.h"
9 #include "MPreFixups.h"
10
11 U_NAMESPACE_BEGIN
12
13 struct FixupData
14 {
15 le_int32 fBaseIndex;
16 le_int32 fMPreIndex;
17 };
18
MPreFixups(le_int32 charCount)19 MPreFixups::MPreFixups(le_int32 charCount)
20 : fFixupData(NULL), fFixupCount(0)
21 {
22 fFixupData = LE_NEW_ARRAY(FixupData, charCount);
23 }
24
~MPreFixups()25 MPreFixups::~MPreFixups()
26 {
27 LE_DELETE_ARRAY(fFixupData);
28 fFixupData = NULL;
29 }
30
add(le_int32 baseIndex,le_int32 mpreIndex)31 void MPreFixups::add(le_int32 baseIndex, le_int32 mpreIndex)
32 {
33 // NOTE: don't add the fixup data if the mpre is right
34 // before the base consonant glyph.
35 if (baseIndex - mpreIndex > 1) {
36 fFixupData[fFixupCount].fBaseIndex = baseIndex;
37 fFixupData[fFixupCount].fMPreIndex = mpreIndex;
38
39 fFixupCount += 1;
40 }
41 }
42
apply(LEGlyphStorage & glyphStorage,LEErrorCode & success)43 void MPreFixups::apply(LEGlyphStorage &glyphStorage, LEErrorCode& success)
44 {
45 if (LE_FAILURE(success)) {
46 return;
47 }
48
49 for (le_int32 fixup = 0; fixup < fFixupCount; fixup += 1) {
50 le_int32 baseIndex = fFixupData[fixup].fBaseIndex;
51 le_int32 mpreIndex = fFixupData[fixup].fMPreIndex;
52 le_int32 mpreLimit = mpreIndex + 1;
53
54 while (glyphStorage[baseIndex] == 0xFFFF || glyphStorage[baseIndex] == 0xFFFE) {
55 baseIndex -= 1;
56 }
57
58 while (glyphStorage[mpreLimit] == 0xFFFF || glyphStorage[mpreLimit] == 0xFFFE) {
59 mpreLimit += 1;
60 }
61
62 if (mpreLimit == baseIndex) {
63 continue;
64 }
65
66 LEErrorCode success = LE_NO_ERROR;
67 le_int32 mpreCount = mpreLimit - mpreIndex;
68 le_int32 moveCount = baseIndex - mpreLimit;
69 le_int32 mpreDest = baseIndex - mpreCount;
70 LEGlyphID *mpreSave = LE_NEW_ARRAY(LEGlyphID, mpreCount);
71 le_int32 *indexSave = LE_NEW_ARRAY(le_int32, mpreCount);
72
73 if (mpreSave == NULL || indexSave == NULL) {
74 LE_DELETE_ARRAY(mpreSave);
75 LE_DELETE_ARRAY(indexSave);
76 success = LE_MEMORY_ALLOCATION_ERROR;
77 return;
78 }
79
80 le_int32 i;
81
82 for (i = 0; i < mpreCount; i += 1) {
83 mpreSave[i] = glyphStorage[mpreIndex + i];
84 indexSave[i] = glyphStorage.getCharIndex(mpreIndex + i, success); //charIndices[mpreIndex + i];
85 }
86
87 for (i = 0; i < moveCount; i += 1) {
88 LEGlyphID glyph = glyphStorage[mpreLimit + i];
89 le_int32 charIndex = glyphStorage.getCharIndex(mpreLimit + i, success);
90
91 glyphStorage[mpreIndex + i] = glyph;
92 glyphStorage.setCharIndex(mpreIndex + i, charIndex, success);
93 }
94
95 for (i = 0; i < mpreCount; i += 1) {
96 glyphStorage[mpreDest + i] = mpreSave[i];
97 glyphStorage.setCharIndex(mpreDest, indexSave[i], success);
98 }
99
100 LE_DELETE_ARRAY(indexSave);
101 LE_DELETE_ARRAY(mpreSave);
102 }
103 }
104
105 U_NAMESPACE_END
106