ICU-57132.0.1.tar.gz

[apple/icu.git] / icuSources / layout / ArabicLayoutEngine.cpp

diff --git a/icuSources/layout/ArabicLayoutEngine.cpp b/icuSources/layout/ArabicLayoutEngine.cpp
index 265d884a6e02f8569d9dd4432455c47e28913811..1a98b604cf9d3c2906b8c1d1d64e026d5ae263d3 100644 (file)
--- a/icuSources/layout/ArabicLayoutEngine.cpp
+++ b/icuSources/layout/ArabicLayoutEngine.cpp
@@ -1,7 +1,7 @@
 
 /*
  *
- * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
  *
  */
 
@@ -33,17 +33,29 @@ le_bool CharSubstitutionFilter::accept(LEGlyphID glyph) const
 
 UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ArabicOpenTypeLayoutEngine)
 
-ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
-                        const GlyphSubstitutionTableHeader *gsubTable)
-    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, gsubTable)
+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)
 {
-    /**/ fFeatureOrder = ArabicShaping::getFeatureOrder();
+    fFeatureMap = ArabicShaping::getFeatureMap(fFeatureMapCount);
+    fFeatureOrder = TRUE;
 }
 
-ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode)
-    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode)
+ArabicOpenTypeLayoutEngine::ArabicOpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode,
+                                                       le_int32 languageCode,
+                                                      le_int32 typoFlags, LEErrorCode &success)
+    : OpenTypeLayoutEngine(fontInstance, scriptCode, languageCode, typoFlags, success)
 {
-    // fFeatureOrder = ArabicShaping::getFeatureOrder();
+    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()
@@ -54,8 +66,9 @@ ArabicOpenTypeLayoutEngine::~ArabicOpenTypeLayoutEngine()
 // 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)
+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;
@@ -66,14 +79,26 @@ le_int32 ArabicOpenTypeLayoutEngine::characterProcessing(const LEUnicode chars[]
         return 0;
     }
 
-    glyphStorage.adoptGlyphCount(count);
+    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)) {
-        success = LE_MEMORY_ALLOCATION_ERROR;
+        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;
@@ -91,32 +116,30 @@ void ArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode chars[], l
         return;
     }
 
-    if (fGPOSTable != NULL) {
+    if (!fGPOSTable.isEmpty()) {
         OpenTypeLayoutEngine::adjustGlyphPositions(chars, offset, count, reverse, glyphStorage, success);
-    } else if (fGDEFTable != NULL) {
-        GDEFMarkFilter filter(fGDEFTable);
-
+    } else if (!fGDEFTable.isEmpty()) {
+        GDEFMarkFilter filter(fGDEFTable, success);
         adjustMarkGlyphs(glyphStorage, &filter, success);
     } else {
-        GlyphDefinitionTableHeader *gdefTable = (GlyphDefinitionTableHeader *) CanonShaping::glyphDefinitionTable;
-        GDEFMarkFilter filter(gdefTable);
+        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)
-    : ArabicOpenTypeLayoutEngine(fontInstance, scriptCode, languageCode)
+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;
-
-    fSubstitutionFilter = new CharSubstitutionFilter(fontInstance);
+    /* OpenTypeLayoutEngine will allocate a substitution filter */
 }
 
 UnicodeArabicOpenTypeLayoutEngine::~UnicodeArabicOpenTypeLayoutEngine()
 {
-    delete fSubstitutionFilter;
+    /* OpenTypeLayoutEngine will cleanup the substitution filter */
 }
 
 // "glyphs", "indices" -> glyphs, indices
@@ -187,7 +210,7 @@ void UnicodeArabicOpenTypeLayoutEngine::adjustGlyphPositions(const LEUnicode cha
         return;
     }
 
-    GDEFMarkFilter filter(fGDEFTable);
+    GDEFMarkFilter filter(fGDEFTable, success);
 
     adjustMarkGlyphs(&chars[offset], count, reverse, glyphStorage, &filter, success);
 }