1/*
2 *
3 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
4 *
5 * Developed at DIT - Government of Bhutan
6 *
7 * Contact person: Pema Geyleg - <pema_geyleg@druknet.bt>
8 *
9 * This file is a modification of the ICU file KhmerReordering.cpp
10 * by Jens Herden and Javier Sola who have given all their possible rights to IBM and the Governement of Bhutan
11 * A first module for Dzongkha was developed by Karunakar under Panlocalisation funding.
12 * Assistance for this module has been received from Namgay Thinley, Christopher Fynn and Javier Sola
13 *
14 */
15
16
17#include "OpenTypeLayoutEngine.h"
18#include "TibetanLayoutEngine.h"
19#include "LEGlyphStorage.h"
20#include "TibetanReordering.h"
21
22U_NAMESPACE_BEGIN
23
24UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TibetanOpenTypeLayoutEngine)
25
26TibetanOpenTypeLayoutEngine::TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
27                                                         le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success)
28    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success)
29{
30    fFeatureMap   = TibetanReordering::getFeatureMap(fFeatureMapCount);
31    fFeatureOrder = TRUE;
32}
33
34TibetanOpenTypeLayoutEngine::TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
35						     le_int32 typoFlags, LEErrorCode &success)
36    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
37{
38    fFeatureMap   = TibetanReordering::getFeatureMap(fFeatureMapCount);
39    fFeatureOrder = TRUE;
40}
41
42TibetanOpenTypeLayoutEngine::~TibetanOpenTypeLayoutEngine()
43{
44    // nothing to do
45}
46
47// Input: characters
48// Output: characters, char indices, tags
49// Returns: output character count
50le_int32 TibetanOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
51        LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
52{
53    if (LE_FAILURE(success)) {
54        return 0;
55    }
56
57    if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
58        success = LE_ILLEGAL_ARGUMENT_ERROR;
59        return 0;
60    }
61
62    le_int32 worstCase = count * 3;  // worst case is 3 for Khmer  TODO check if 2 is enough
63
64    outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
65
66    if (outChars == NULL) {
67        success = LE_MEMORY_ALLOCATION_ERROR;
68        return 0;
69    }
70
71    glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
72    glyphStorage.allocateAuxData(success);
73
74    if (LE_FAILURE(success)) {
75        LE_DELETE_ARRAY(outChars);
76        return 0;
77    }
78
79    // NOTE: assumes this allocates featureTags...
80    // (probably better than doing the worst case stuff here...)
81    le_int32 outCharCount = TibetanReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage);
82
83    glyphStorage.adoptGlyphCount(outCharCount);
84    return outCharCount;
85}
86
87U_NAMESPACE_END
88