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