1
2 /*
3 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
4 *
5 * This file is a modification of the ICU file IndicLayoutEngine.cpp
6 * by Jens Herden and Javier Sola for Khmer language
7 *
8 */
9
10
11 #include "OpenTypeLayoutEngine.h"
12 #include "KhmerLayoutEngine.h"
13 #include "LEGlyphStorage.h"
14 #include "KhmerReordering.h"
15
16 U_NAMESPACE_BEGIN
17
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)18 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(KhmerOpenTypeLayoutEngine)
19
20 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
21 le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)
22 : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
23 {
24 fFeatureMap = KhmerReordering::getFeatureMap(fFeatureMapCount);
25 fFeatureOrder = TRUE;
26 }
27
KhmerOpenTypeLayoutEngine(const LEFontInstance * fontInstance,le_int32 scriptCode,le_int32 languageCode,le_int32 typoFlags,LEErrorCode & success)28 KhmerOpenTypeLayoutEngine::KhmerOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
29 le_int32 typoFlags, LEErrorCode &success)
30 : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
31 {
32 fFeatureMap = KhmerReordering::getFeatureMap(fFeatureMapCount);
33 fFeatureOrder = TRUE;
34 }
35
~KhmerOpenTypeLayoutEngine()36 KhmerOpenTypeLayoutEngine::~KhmerOpenTypeLayoutEngine()
37 {
38 // nothing to do
39 }
40
41 // Input: characters
42 // Output: characters, char indices, tags
43 // Returns: output character count
characterProcessing(const LEUnicode chars[],le_int32 offset,le_int32 count,le_int32 max,le_bool rightToLeft,LEUnicode * & outChars,LEGlyphStorage & glyphStorage,LEErrorCode & success)44 le_int32 KhmerOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
45 LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
46 {
47 if (LE_FAILURE(success)) {
48 return 0;
49 }
50
51 if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
52 success = LE_ILLEGAL_ARGUMENT_ERROR;
53 return 0;
54 }
55
56 le_int32 worstCase = count * 3; // worst case is 3 for Khmer TODO check if 2 is enough
57
58 outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
59
60 if (outChars == NULL) {
61 success = LE_MEMORY_ALLOCATION_ERROR;
62 return 0;
63 }
64
65 glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
66 glyphStorage.allocateAuxData(success);
67
68 if (LE_FAILURE(success)) {
69 LE_DELETE_ARRAY(outChars);
70 return 0;
71 }
72
73 // NOTE: assumes this allocates featureTags...
74 // (probably better than doing the worst case stuff here...)
75 le_int32 outCharCount = KhmerReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);
76
77 glyphStorage.adoptGlyphCount(outCharCount);
78 return outCharCount;
79 }
80
81 U_NAMESPACE_END
82