4 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
9 #include "LayoutEngine.h"
10 #include "ThaiLayoutEngine.h"
11 #include "ScriptAndLanguageTags.h"
12 #include "LEGlyphStorage.h"
14 #include "KernTable.h"
16 #include "ThaiShaping.h"
20 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)
22 ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
23 : LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
27 // Figure out which presentation forms the font uses
28 if (! fontInstance->canDisplay(0x0E01)) {
29 // No Thai in font; don't use presentation forms.
31 } else if (fontInstance->canDisplay(0x0E64)) {
32 // WorldType uses reserved space in Thai block
34 } else if (fontInstance->canDisplay(0xF701)) {
35 // Microsoft corporate zone
38 if (!fontInstance->canDisplay(fErrorChar)) {
41 } else if (fontInstance->canDisplay(0xF885)) {
42 // Apple corporate zone
45 // no presentation forms in the font
50 ThaiLayoutEngine::~ThaiLayoutEngine()
55 // Input: characters (0..max provided for context)
56 // Output: glyphs, char indices
57 // Returns: the glyph count
58 // NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
59 le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
61 if (LE_FAILURE(success)) {
65 if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
66 success = LE_ILLEGAL_ARGUMENT_ERROR;
73 // This is enough room for the worst-case expansion
75 outChars = LE_NEW_ARRAY(LEUnicode, count * 2);
77 if (outChars == NULL) {
78 success = LE_MEMORY_ALLOCATION_ERROR;
82 glyphStorage.allocateGlyphArray(count * 2, FALSE, success);
84 if (LE_FAILURE(success)) {
85 LE_DELETE_ARRAY(outChars);
86 success = LE_MEMORY_ALLOCATION_ERROR;
90 glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
91 mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);
93 LE_DELETE_ARRAY(outChars);
95 glyphStorage.adoptGlyphCount(glyphCount);
99 // This is the same as LayoutEngline::adjustGlyphPositions() except that it doesn't call adjustMarkGlyphs
100 void ThaiLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool /*reverse*/,
101 LEGlyphStorage &glyphStorage, LEErrorCode &success)
103 if (LE_FAILURE(success)) {
107 if (chars == NULL || offset < 0 || count < 0) {
108 success = LE_ILLEGAL_ARGUMENT_ERROR;
112 if (fTypoFlags & LE_Kerning_FEATURE_FLAG) { /* kerning enabled */
113 LETableReference kernTable(fFontInstance, LE_KERN_TABLE_TAG, success);
114 KernTable kt(kernTable, success);
115 kt.process(glyphStorage, success);
118 // default is no adjustments