| |
| /* |
| * @(#)ThaiLayoutEngine.cpp 1.2 00/03/15 |
| * |
| * (C) Copyright IBM Corp. 1998, 1999, 2000 - All Rights Reserved |
| * |
| */ |
| |
| #include "LETypes.h" |
| #include "LayoutEngine.h" |
| #include "ThaiLayoutEngine.h" |
| #include "ScriptAndLanguageTags.h" |
| |
| #include "ThaiShaping.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode) |
| : LayoutEngine(fontInstance, scriptCode, languageCode) |
| { |
| fErrorChar = 0x25CC; |
| |
| // Figure out which presentation forms the font uses |
| if (fontInstance->canDisplay(0x0E64)) { |
| // WorldType uses reserved space in Thai block |
| fGlyphSet = 0; |
| } else if (fontInstance->canDisplay(0xF701)) { |
| // Microsoft corporate zone |
| fGlyphSet = 1; |
| |
| if (!fontInstance->canDisplay(fErrorChar)) { |
| fErrorChar = 0xF71B; |
| } |
| } else if (fontInstance->canDisplay(0xF885)) { |
| // Apple corporate zone |
| fGlyphSet = 2; |
| } else { |
| // no presentation forms in the font |
| fGlyphSet = 3; |
| } |
| } |
| |
| ThaiLayoutEngine::~ThaiLayoutEngine() |
| { |
| // nothing to do |
| } |
| |
| // Input: characters (0..max provided for context) |
| // Output: glyphs, char indices |
| // Returns: the glyph count |
| // NOTE: this assumes that ThaiShaping::compose will allocate the outChars array... |
| le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success) |
| { |
| if (LE_FAILURE(success)) { |
| return 0; |
| } |
| |
| if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) { |
| success = LE_ILLEGAL_ARGUMENT_ERROR; |
| return 0; |
| } |
| |
| LEUnicode *outChars; |
| le_int32 glyphCount; |
| |
| // This is enough room for the worst-case expansion |
| // (it says here...) |
| outChars = new LEUnicode[count * 2]; |
| |
| if (outChars == NULL) { |
| success = LE_MEMORY_ALLOCATION_ERROR; |
| return 0; |
| } |
| |
| charIndices = new le_int32[count * 2]; |
| |
| if (charIndices == NULL) { |
| delete[] outChars; |
| success = LE_MEMORY_ALLOCATION_ERROR; |
| return 0; |
| } |
| |
| glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, charIndices); |
| mapCharsToGlyphs(outChars, 0, glyphCount, false, false, glyphs, charIndices, success); |
| |
| delete[] outChars; |
| |
| return glyphCount; |
| } |
| |
| U_NAMESPACE_END |