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 "OpenTypeLayoutEngine.h"
sl@0: #include "IndicLayoutEngine.h"
sl@0: #include "ScriptAndLanguageTags.h"
sl@0: 
sl@0: #include "GlyphSubstitutionTables.h"
sl@0: #include "GlyphDefinitionTables.h"
sl@0: #include "GlyphPositioningTables.h"
sl@0: 
sl@0: #include "GDEFMarkFilter.h"
sl@0: #include "LEGlyphStorage.h"
sl@0: 
sl@0: #include "IndicReordering.h"
sl@0: 
sl@0: U_NAMESPACE_BEGIN
sl@0: 
sl@0: UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicOpenTypeLayoutEngine)
sl@0: 
sl@0: IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
sl@0:                     le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable), fMPreFixups(NULL)
sl@0: {
sl@0:     fFeatureOrder = IndicReordering::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags)
sl@0:     : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags), fMPreFixups(NULL)
sl@0: {
sl@0:     fFeatureOrder = IndicReordering::getFeatureOrder();
sl@0: }
sl@0: 
sl@0: IndicOpenTypeLayoutEngine::~IndicOpenTypeLayoutEngine()
sl@0: {
sl@0:     // nothing to do
sl@0: }
sl@0: 
sl@0: // Input: characters, tags
sl@0: // Output: glyphs, char indices
sl@0: le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
sl@0:                     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:     le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, glyphStorage, success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     IndicReordering::adjustMPres(fMPreFixups, glyphStorage, success);
sl@0: 
sl@0:     return retCount;
sl@0: }
sl@0: 
sl@0: // Input: characters
sl@0: // Output: characters, char indices, tags
sl@0: // Returns: output character count
sl@0: le_int32 IndicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
sl@0:         LEUnicode *&outChars, 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:     le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
sl@0: 
sl@0:     outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
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(worstCase, rightToLeft, success);
sl@0:     glyphStorage.allocateAuxData(success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         LE_DELETE_ARRAY(outChars);
sl@0:         outChars = NULL;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     // NOTE: assumes this allocates featureTags...
sl@0:     // (probably better than doing the worst case stuff here...)
sl@0:     le_int32 outCharCount = IndicReordering::reorder(&chars[offset], count,
sl@0:         fScriptCode, outChars, glyphStorage, &fMPreFixups, success);
sl@0: 
sl@0:     if (LE_FAILURE(success)) {
sl@0:         LE_DELETE_ARRAY(outChars);
sl@0:         outChars = NULL;
sl@0:         return 0;
sl@0:     }
sl@0: 
sl@0:     glyphStorage.adoptGlyphCount(outCharCount);
sl@0:     return outCharCount;
sl@0: }
sl@0: 
sl@0: U_NAMESPACE_END