diff options
Diffstat (limited to 'Build/source/libs/icu-xetex/layout/IndicLayoutEngine.cpp')
-rw-r--r-- | Build/source/libs/icu-xetex/layout/IndicLayoutEngine.cpp | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/Build/source/libs/icu-xetex/layout/IndicLayoutEngine.cpp b/Build/source/libs/icu-xetex/layout/IndicLayoutEngine.cpp new file mode 100644 index 00000000000..31d5075620e --- /dev/null +++ b/Build/source/libs/icu-xetex/layout/IndicLayoutEngine.cpp @@ -0,0 +1,114 @@ + +/* + * + * (C) Copyright IBM Corp. 1998-2005 - 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, const GlyphSubstitutionTableHeader *gsubTable) + : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable), fMPreFixups(NULL) +{ + fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount); + fFeatureOrder = TRUE; + + fFilterZeroWidth = IndicReordering::getFilterZeroWidth(fScriptCode); +} + +IndicOpenTypeLayoutEngine::IndicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags) + : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags), fMPreFixups(NULL) +{ + fFeatureMap = IndicReordering::getFeatureMap(fFeatureMapCount); + fFeatureOrder = TRUE; +} + +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, le_bool /*doCanonGSUB*/, + 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 |