/* * * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved * */ #include "LETypes.h" #include "LEScripts.h" #include "LEGlyphFilter.h" #include "LEGlyphStorage.h" #include "LayoutEngine.h" #include "OpenTypeLayoutEngine.h" #include "ArabicLayoutEngine.h" #include "ScriptAndLanguageTags.h" #include "CharSubstitutionFilter.h" #include "GlyphSubstitutionTables.h" #include "GlyphDefinitionTables.h" #include "GlyphPositioningTables.h" #include "GDEFMarkFilter.h" #include "ArabicShaping.h" #include "CanonShaping.h" U_NAMESPACE_BEGIN le_bool CharSubstitutionFilter::accept(LEGlyphID glyph) const { return fFontInstance->canDisplay((LEUnicode) glyph); } UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ArabicOpenTypeLayoutEngine) ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, const LEReferenceTo<GlyphSubstitutionTableHeader> &gsubTable, LEErrorCode &success) : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, gsubTable, success) { fFeatureMap = ArabicShaping::getFeatureMap(fFeatureMapCount); fFeatureOrder = TRUE; } ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success) : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success) { fFeatureMap = ArabicShaping::getFeatureMap(fFeatureMapCount); // NOTE: We don't need to set fFeatureOrder to TRUE here // because this constructor is only called by the constructor // for UnicodeArabicOpenTypeLayoutEngine, which uses a pre-built // GSUB table that has the features in the correct order. //fFeatureOrder = TRUE; } ArabicOpenTypeLayoutEngine::~ArabicOpenTypeLayoutEngine() { // nothing to do } // Input: characters // Output: characters, char indices, tags // Returns: output character count le_int32 ArabicOpenTypeLayoutEngine::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; } outChars = LE_NEW_ARRAY(LEUnicode, count); if (outChars == NULL) { success = LE_MEMORY_ALLOCATION_ERROR; return 0; } glyphStorage.allocateGlyphArray(count, rightToLeft, success); glyphStorage.allocateAuxData(success); if (LE_FAILURE(success)) { LE_DELETE_ARRAY(outChars); return 0; } CanonShaping::reorderMarks(&chars[offset], count, rightToLeft, outChars, glyphStorage); // Note: This processes the *original* character array so we can get context // for the first and last characters. This is OK because only the marks // will have been reordered, and they don't contribute to shaping. ArabicShaping::shape(chars, offset, count, max, rightToLeft, glyphStorage); return count; } void ArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success) { if (LE_FAILURE(success)) { return; } if (chars == NULL || offset < 0 || count < 0) { success = LE_ILLEGAL_ARGUMENT_ERROR; return; } if (!fGPOSTable.isEmpty()) { OpenTypeLayoutEngine::adjustGlyphPositions(chars, offset, count, reverse, glyphStorage, success); } else if (!fGDEFTable.isEmpty()) { GDEFMarkFilter filter(fGDEFTable, success); adjustMarkGlyphs(glyphStorage, &filter, success); } else { LEReferenceTo<GlyphDefinitionTableHeader> gdefTable(CanonShaping::glyphDefinitionTable, CanonShaping::glyphDefinitionTableLen); GDEFMarkFilter filter(gdefTable, success); adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success); } } UnicodeArabicOpenTypeLayoutEngine::UnicodeArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode, le_int32 typoFlags, LEErrorCode &success) : ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags | LE_CHAR_FILTER_FEATURE_FLAG, success) { fGSUBTable = (const GlyphSubstitutionTableHeader *) CanonShaping::glyphSubstitutionTable; fGDEFTable = (const GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable; /* OpenTypeLayoutEngine will allocate a substitution filter */ } UnicodeArabicOpenTypeLayoutEngine::~UnicodeArabicOpenTypeLayoutEngine() { /* OpenTypeLayoutEngine will cleanup the substitution filter */ } // "glyphs", "indices" -> glyphs, indices le_int32 UnicodeArabicOpenTypeLayoutEngine::glyphPostProcessing(LEGlyphStorage &tempGlyphStorage, LEGlyphStorage &glyphStorage, LEErrorCode &success) { if (LE_FAILURE(success)) { return 0; } // FIXME: we could avoid the memory allocation and copy if we // made a clone of mapCharsToGlyphs which took the fake glyphs // directly. le_int32 tempGlyphCount = tempGlyphStorage.getGlyphCount(); LEUnicode *tempChars = LE_NEW_ARRAY(LEUnicode, tempGlyphCount); if (tempChars == NULL) { success = LE_MEMORY_ALLOCATION_ERROR; return 0; } for (le_int32 i = 0; i < tempGlyphCount; i += 1) { tempChars[i] = (LEUnicode) LE_GET_GLYPH(tempGlyphStorage[i]); } glyphStorage.adoptCharIndicesArray(tempGlyphStorage); ArabicOpenTypeLayoutEngine::mapCharsToGlyphs(tempChars, 0, tempGlyphCount, FALSE, TRUE, glyphStorage, success); LE_DELETE_ARRAY(tempChars); return tempGlyphCount; } void UnicodeArabicOpenTypeLayoutEngine::mapCharsToGlyphs(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, le_bool /*mirror*/, LEGlyphStorage &glyphStorage, LEErrorCode &success) { if (LE_FAILURE(success)) { return; } if (chars == NULL || offset < 0 || count < 0) { success = LE_ILLEGAL_ARGUMENT_ERROR; return; } le_int32 i, dir = 1, out = 0; if (reverse) { out = count - 1; dir = -1; } glyphStorage.allocateGlyphArray(count, reverse, success); for (i = 0; i < count; i += 1, out += dir) { glyphStorage[out] = (LEGlyphID) chars[offset + i]; } } void UnicodeArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], le_int32 offset, le_int32 count, le_bool reverse, LEGlyphStorage &glyphStorage, LEErrorCode &success) { if (LE_FAILURE(success)) { return; } if (chars == NULL || offset < 0 || count < 0) { success = LE_ILLEGAL_ARGUMENT_ERROR; return; } GDEFMarkFilter filter(fGDEFTable, success); adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success); } U_NAMESPACE_END