sl@0: 
sl@0: /*
sl@0:  *
sl@0:  * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved
sl@0:  *
sl@0:  */
sl@0: 
sl@0: #include "LETypes.h"
sl@0: #include "LayoutEngine.h"
sl@0: #include "ThaiLayoutEngine.h"
sl@0: #include "ScriptAndLanguageTags.h"
sl@0: #include "LEGlyphStorage.h"
sl@0: 
sl@0: #include "ThaiShaping.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ThaiLayoutEngine)
sl@0: 
sl@0: ThaiLayoutEngine::ThaiLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)
sl@0:     : LayoutEngine(fontInstance, scriptCode, languageCode, typoFlags)
sl@0: {
sl@0:     fErrorChar = 0x25CC;
sl@0: 
sl@0:     // Figure out which presentation forms the font uses
sl@0:     if (fontInstance->canDisplay(0x0E64)) {
sl@0:         // WorldType uses reserved space in Thai block
sl@0:         fGlyphSet = 0;
sl@0:     } else if (fontInstance->canDisplay(0xF701)) {
sl@0:         // Microsoft corporate zone
sl@0:         fGlyphSet = 1;
sl@0: 
sl@0:         if (!fontInstance->canDisplay(fErrorChar)) {
sl@0:             fErrorChar = 0xF71B;
sl@0:         }
sl@0:     } else if (fontInstance->canDisplay(0xF885)) {
sl@0:         // Apple corporate zone
sl@0:         fGlyphSet = 2;
sl@0:     } else {
sl@0:         // no presentation forms in the font
sl@0:         fGlyphSet = 3;
sl@0:     }
sl@0: }
sl@0: 
sl@0: ThaiLayoutEngine::~ThaiLayoutEngine()
sl@0: {
sl@0:     // nothing to do
sl@0: }
sl@0: 
sl@0: // Input: characters (0..max provided for context)
sl@0: // Output: glyphs, char indices
sl@0: // Returns: the glyph count
sl@0: // NOTE: this assumes that ThaiShaping::compose will allocate the outChars array...
sl@0: le_int32 ThaiLayoutEngine::computeGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool /*rightToLeft*/, LEGlyphStorage &glyphStorage, LEErrorCode &success)
sl@0: {
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     if (chars == NULL || offset < 0 || count < 0 || max < 0 || offset >= max || offset + count > max) {
sl@0:         success = LE_ILLEGAL_ARGUMENT_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     LEUnicode *outChars;
sl@0:     le_int32 glyphCount;
sl@0:     
sl@0:     // This is enough room for the worst-case expansion
sl@0:     // (it says here...)
sl@0:     outChars = LE_NEW_ARRAY(LEUnicode, count * 2);
sl@0: 
sl@0:     if (outChars == NULL) {
sl@0:         success = LE_MEMORY_ALLOCATION_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.allocateGlyphArray(count * 2, FALSE, success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         LE_DELETE_ARRAY(outChars);
sl@0:         success = LE_MEMORY_ALLOCATION_ERROR;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphCount = ThaiShaping::compose(chars, offset, count, fGlyphSet, fErrorChar, outChars, glyphStorage);
sl@0:     mapCharsToGlyphs(outChars, 0, glyphCount, FALSE, FALSE, glyphStorage, success);
sl@0: 
sl@0:     LE_DELETE_ARRAY(outChars);
sl@0: 
sl@0:     glyphStorage.adoptGlyphCount(glyphCount);
sl@0:     return glyphCount;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END