scuffed-code/icu4c/source/layout/IndicLayoutEngine.cpp
2004-10-19 06:25:41 +00:00

111 lines
3.3 KiB
C++

/*
*
* (C) Copyright IBM Corp. 1998-2004 - 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,
const GlyphSubstitutionTableHeader *gsubTable)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable), fMPreFixups(NULL)
{
fFeatureOrder = IndicReordering::getFeatureOrder();
}
IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
: OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode), fMPreFixups(NULL)
{
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,
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;
}
IndicReordering::adjustMPres(fMPreFixups, glyphStorage);
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 = IndicReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage, &fMPreFixups);
glyphStorage.adoptGlyphCount(outCharCount);
return outCharCount;
}
U_NAMESPACE_END