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/*
* @(#)IndicLayoutEngine.cpp 1.3 00/03/15
*
* (C) Copyright IBM Corp. 1998, 1999, 2000, 2001 - All Rights Reserved
*
*/
#include "LETypes.h"
#include "LayoutEngine.h"
#include "OpenTypeLayoutEngine.h"
#include "IndicLayoutEngine.h"
#include "ScriptAndLanguageTags.h"
#include "GlyphSubstitutionTables.h"
#include "GlyphDefinitionTables.h"
#include "GlyphPositioningTables.h"
#include "GDEFMarkFilter.h"
#include "IndicReordering.h"
U_NAMESPACE_BEGIN
IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
const GlyphSubstitutionTableHeader *gsubTable)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable)
{
fFeatureOrder = IndicReordering::getFeatureOrder();
}
IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode)
{
fFeatureOrder = IndicReordering::getFeatureOrder();
}
IndicOpenTypeLayoutEngine::~IndicOpenTypeLayoutEngine()
{
// nothing to do
}
// Input: characters, tags
// Output: glyphs, char indices
le_int32 IndicOpenTypeLayoutEngine::glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft, const LETag **featureTags,
LEGlyphID *&glyphs, le_int32 *&charIndices, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return 0;
}
if (chars == NULL || offset < 0 || count < 0) {
success = LE_ILLEGAL_ARGUMENT_ERROR;
return 0;
}
le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, featureTags, glyphs, charIndices, success);
if (LE_FAILURE(success)) {
return 0;
}
IndicReordering::adjustMPres(&chars[offset], count, glyphs, charIndices, fScriptCode);
return retCount;
}
// Input: characters
// Output: characters, char indices, tags
// Returns: output character count
le_int32 IndicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
LEUnicode *&outChars, le_int32 *&charIndices, const LETag **&featureTags, LEErrorCode &success)
{
if (LE_FAILURE(success)) {
return 0;
}
le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
outChars = new LEUnicode[worstCase];
if (outChars == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
charIndices = new le_int32[worstCase];
if (charIndices == NULL) {
delete[] outChars;
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
featureTags = new const LETag*[worstCase];
if (featureTags == NULL) {
delete[] charIndices;
delete[] outChars;
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
// NOTE: assumes this allocates featureTags...
// (probably better than doing the worst case stuff here...)
return IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, charIndices, featureTags);
}
U_NAMESPACE_END
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