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/*
*
* (C) Copyright IBM Corp. 1998-2009 - 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 "LEGlyphStorage.h"
#include "IndicReordering.h"
U_NAMESPACE_BEGIN
UOBJECT_DEFINE_RTTI_IMPLEMENTATION(IndicOpenTypeLayoutEngine)
IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
le_int32 typoFlags, le_bool version2, const GlyphSubstitutionTableHeader *gsubTable, LEErrorCode &success)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success), fMPreFixups(NULL)
{
if ( version2 ) {
fFeatureMap = IndicReordering::getv2FeatureMap(fFeatureMapCount);
} else {
fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
}
fFeatureOrder = TRUE;
fVersion2 = version2;
fFilterZeroWidth = IndicReordering::getFilterZeroWidth(fScriptCode);
}
IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success), fMPreFixups(NULL)
{
fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount);
fFeatureOrder = TRUE;
fVersion2 = FALSE;
}
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,
LEGlyphStorage &glyphStorage, 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;
}
le_int32 retCount = OpenTypeLayoutEngine::glyphProcessing(chars, offset, count, max, rightToLeft, glyphStorage, success);
if (LE_FAILURE(success)) {
return 0;
}
if (fVersion2) {
IndicReordering::finalReordering(glyphStorage,retCount);
IndicReordering::applyPresentationForms(glyphStorage,retCount);
OpenTypeLayoutEngine::glyphSubstitution(count,max, rightToLeft, glyphStorage, success);
} else {
IndicReordering::adjustMPres(fMPreFixups, glyphStorage, success);
}
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, LEGlyphStorage &glyphStorage, 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;
}
le_int32 worstCase = count * IndicReordering::getWorstCaseExpansion(fScriptCode);
outChars = LE_NEW_ARRAY(LEUnicode, worstCase);
if (outChars == NULL) {
success = LE_MEMORY_ALLOCATION_ERROR;
return 0;
}
glyphStorage.allocateGlyphArray(worstCase, rightToLeft, success);
glyphStorage.allocateAuxData(success);
if (LE_FAILURE(success)) {
LE_DELETE_ARRAY(outChars);
return 0;
}
// NOTE: assumes this allocates featureTags...
// (probably better than doing the worst case stuff here...)
le_int32 outCharCount;
if (fVersion2) {
outCharCount = IndicReordering::v2process(&chars[offset], count, fScriptCode, outChars, glyphStorage);
} else {
outCharCount = IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage, &fMPreFixups, success);
}
if (LE_FAILURE(success)) {
LE_DELETE_ARRAY(outChars);
return 0;
}
glyphStorage.adoptGlyphCount(outCharCount);
return outCharCount;
}
U_NAMESPACE_END
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