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Diffstat (limited to 'Build/source/libs/icu-xetex/layout/TibetanLayoutEngine.cpp')
-rw-r--r-- | Build/source/libs/icu-xetex/layout/TibetanLayoutEngine.cpp | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/Build/source/libs/icu-xetex/layout/TibetanLayoutEngine.cpp b/Build/source/libs/icu-xetex/layout/TibetanLayoutEngine.cpp new file mode 100644 index 00000000000..be97ab5baf4 --- /dev/null +++ b/Build/source/libs/icu-xetex/layout/TibetanLayoutEngine.cpp @@ -0,0 +1,87 @@ +/* + * + * (C) Copyright IBM Corp. 1998-2005 - All Rights Reserved + * + * Developed at DIT - Government of Bhutan + * + * Contact person: Pema Geyleg - <pema_geyleg@druknet.bt> + * + * This file is a modification of the ICU file KhmerReordering.cpp + * by Jens Herden and Javier Sola who have given all their possible rights to IBM and the Governement of Bhutan + * A first module for Dzongkha was developed by Karunakar under Panlocalisation funding. + * Assistance for this module has been received from Namgay Thinley, Christopher Fynn and Javier Sola + * + */ + + +#include "OpenTypeLayoutEngine.h" +#include "TibetanLayoutEngine.h" +#include "LEGlyphStorage.h" +#include "TibetanReordering.h" + +U_NAMESPACE_BEGIN + +UOBJECT_DEFINE_RTTI_IMPLEMENTATION(TibetanOpenTypeLayoutEngine) + +TibetanOpenTypeLayoutEngine::TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, + le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable) + : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable) +{ + fFeatureMap = TibetanReordering::getFeatureMap(fFeatureMapCount); + fFeatureOrder = TRUE; +} + +TibetanOpenTypeLayoutEngine::TibetanOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, + le_int32 typoFlags) + : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags) +{ + fFeatureMap = TibetanReordering::getFeatureMap(fFeatureMapCount); + fFeatureOrder = TRUE; +} + +TibetanOpenTypeLayoutEngine::~TibetanOpenTypeLayoutEngine() +{ + // nothing to do +} + +// Input: characters +// Output: characters, char indices, tags +// Returns: output character count +le_int32 TibetanOpenTypeLayoutEngine::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 * 3; // worst case is 3 for Khmer TODO check if 2 is enough + + 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 = TibetanReordering::reorder(&chars[offset], count, fScriptCode, outChars, glyphStorage); + + glyphStorage.adoptGlyphCount(outCharCount); + return outCharCount; +} + +U_NAMESPACE_END |