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1 
2 /*
3  *
4  * (C) Copyright IBM Corp. 1998-2009 - All Rights Reserved
5  *
6  */
7 
8 #include "LETypes.h"
9 #include "LayoutEngine.h"
10 #include "OpenTypeLayoutEngine.h"
11 #include "IndicLayoutEngine.h"
12 #include "ScriptAndLanguageTags.h"
13 
14 #include "GlyphSubstitutionTables.h"
15 #include "GlyphDefinitionTables.h"
16 #include "GlyphPositioningTables.h"
17 
18 #include "GDEFMarkFilter.h"
19 #include "LEGlyphStorage.h"
20 
21 #include "IndicReordering.h"
22 
23 U_NAMESPACE_BEGIN
24 
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicOpenTypeLayoutEngine)25 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicOpenTypeLayoutEngine)
26 
27 IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
28                     le_int32 typoFlags, le_bool version2, const GlyphSubstitutionTableHeader *gsubTable, LEErrorCode &success)
29     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success), fMPreFixups(NULL)
30 {
31 	if ( version2 ) {
32 		fFeatureMap = IndicReordering::getv2FeatureMap(fFeatureMapCount);
33 	} else {
34         fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
35 	}
36 	fFeatureOrder = TRUE;
37     fVersion2 = version2;
38     fFilterZeroWidth = IndicReordering::getFilterZeroWidth(fScriptCode);
39 }
40 
IndicOpenTypeLayoutEngine(const LEFontInstance * fontInstance,le_int32 scriptCode,le_int32 languageCode,le_int32 typoFlags,LEErrorCode & success)41 IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
42     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success), fMPreFixups(NULL)
43 {
44     fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
45     fFeatureOrder = TRUE;
46 	fVersion2 =  FALSE;
47 }
48 
~IndicOpenTypeLayoutEngine()49 IndicOpenTypeLayoutEngine::~IndicOpenTypeLayoutEngine()
50 {
51     // nothing to do
52 }
53 
54 // Input: characters, tags
55 // Output: glyphs, char indices
glyphProcessing(const LEUnicode chars[],le_int32 offset,le_int32 count,le_int32 max,le_bool rightToLeft,LEGlyphStorage & glyphStorage,LEErrorCode & success)56 le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
57                     LEGlyphStorage &glyphStorage, LEErrorCode &success)
58 {
59     if (LE_FAILURE(success)) {
60         return 0;
61     }
62 
63     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
64         success = LE_ILLEGAL_ARGUMENT_ERROR;
65         return 0;
66     }
67 
68     le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, glyphStorage, success);
69 
70     if (LE_FAILURE(success)) {
71         return 0;
72     }
73 
74     if (fVersion2) {
75         IndicReordering::finalReordering(glyphStorage,retCount);
76         IndicReordering::applyPresentationForms(glyphStorage,retCount);
77         OpenTypeLayoutEngine::glyphSubstitution(count,max, rightToLeft, glyphStorage, success);
78     } else {
79         IndicReordering::adjustMPres(fMPreFixups, glyphStorage, success);
80     }
81     return retCount;
82 }
83 
84 // Input: characters
85 // Output: characters, char indices, tags
86 // 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)87 le_int32 IndicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
88         LEUnicode *&outChars, LEGlyphStorage &glyphStorage, LEErrorCode &success)
89 {
90     if (LE_FAILURE(success)) {
91         return 0;
92     }
93 
94     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
95         success = LE_ILLEGAL_ARGUMENT_ERROR;
96         return 0;
97     }
98 
99     le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
100 
101     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
102 
103     if (outChars == NULL) {
104         success = LE_MEMORY_ALLOCATION_ERROR;
105         return 0;
106     }
107 
108     glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
109     glyphStorage.allocateAuxData(success);
110 
111     if (LE_FAILURE(success)) {
112         LE_DELETE_ARRAY(outChars);
113         return 0;
114     }
115 
116     // NOTE: assumes this allocates featureTags...
117     // (probably better than doing the worst case stuff here...)
118 
119     le_int32 outCharCount;
120     if (fVersion2) {
121         outCharCount = IndicReordering::v2process(&chars[offset], count, fScriptCode, outChars, glyphStorage);
122     } else {
123         outCharCount = IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage, &fMPreFixups, success);
124     }
125 
126     if (LE_FAILURE(success)) {
127         LE_DELETE_ARRAY(outChars);
128         return 0;
129     }
130 
131     glyphStorage.adoptGlyphCount(outCharCount);
132     return outCharCount;
133 }
134 
135 U_NAMESPACE_END
136