ICU-461.12.tar.gz

[apple/icu.git] / icuSources / layout / OpenTypeLayoutEngine.h

diff --git a/icuSources/layout/OpenTypeLayoutEngine.h b/icuSources/layout/OpenTypeLayoutEngine.h
index 61cf1317aa0dab37e3fc637b9785d67be2ab78b5..4de80569b28e45ea1208422f2d5d3a9edc0a5462 100644 (file)
--- a/icuSources/layout/OpenTypeLayoutEngine.h
+++ b/icuSources/layout/OpenTypeLayoutEngine.h
@@ -1,8 +1,5 @@
-
 /*
- * %W% %E%
- *
- * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved
+ * (C) Copyright IBM Corp. 1998-2009 - All Rights Reserved
  *
  */
 
@@ -45,7 +42,7 @@ U_NAMESPACE_BEGIN
  *
  * @internal
  */
-class OpenTypeLayoutEngine : public LayoutEngine
+class U_LAYOUT_API OpenTypeLayoutEngine : public LayoutEngine
 {
 public:
     /**
@@ -58,6 +55,7 @@ public:
      * @param scriptCode - the script
      * @param langaugeCode - the language
      * @param gsubTable - the GSUB table
+     * @param success - set to an error code if the operation fails
      *
      * @see LayoutEngine::layoutEngineFactory
      * @see ScriptAndLangaugeTags.h for script and language codes
@@ -65,7 +63,7 @@ public:
      * @internal
      */
     OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
-                            const GlyphSubstitutionTableHeader *gsubTable);
+                            le_int32 typoFlags, const GlyphSubstitutionTableHeader *gsubTable, LEErrorCode &success);
 
     /**
      * This constructor is used when the font requires a "canned" GSUB table which can't be known
@@ -74,10 +72,12 @@ public:
      * @param fontInstance - the font
      * @param scriptCode - the script
      * @param langaugeCode - the language
+     * @param success - set to an error code if the operation fails
      *
      * @internal
      */
-    OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode);
+    OpenTypeLayoutEngine(const LEFontInstance *fontInstance, le_int32 scriptCode, le_int32 languageCode,
+                        le_int32 typoFlags, LEErrorCode &success);
 
     /**
      * The destructor, virtual for correct polymorphic invocation.
@@ -89,6 +89,8 @@ public:
     /**
      * A convenience method used to convert the script code into
      * the four byte script tag required by OpenType.
+        * For Indic languages where multiple script tags exist,
+        * the version 1 (old style) tag is returned.
      *
      * @param scriptCode - the script code
      *
@@ -97,6 +99,19 @@ public:
      * @internal
      */
     static LETag getScriptTag(le_int32 scriptCode);
+    /**
+     * A convenience method used to convert the script code into
+     * the four byte script tag required by OpenType.
+        * For Indic languages where multiple script tags exist,
+        * the version 2 tag is returned.
+     *
+     * @param scriptCode - the script code
+     *
+     * @return the four byte script tag
+     *
+     * @internal
+     */
+    static LETag getV2ScriptTag(le_int32 scriptCode);
 
     /**
      * A convenience method used to convert the langauge code into
@@ -124,6 +139,13 @@ public:
      */
     static UClassID getStaticClassID();
 
+    /**
+     * The array of language tags, indexed by language code.
+     *
+     * @internal
+     */
+    static const LETag languageTags[];
+
 private:
 
     /**
@@ -137,28 +159,39 @@ private:
      */
     static const LETag scriptTags[];
 
+protected:
     /**
-     * The array of language tags, indexed by language code.
+     * A set of "default" features. The default characterProcessing method
+     * will apply all of these features to every glyph.
+     *
+     * @internal
      */
-    static const LETag languageTags[];
+    FeatureMask fFeatureMask;
 
-protected:
     /**
-     * A list of "default" features. The default characterProcessing method
-     * will apply all of these tags to every glyph.
+     * A set of mappings from feature tags to feature masks. These may
+     * be in the order in which the featues should be applied, but they
+     * don't need to be.
      *
      * @internal
      */
-    const LETag *fFeatureList;
+    const FeatureMap *fFeatureMap;
 
     /**
-     * A list of tags in the order in which the features in
-     * the font should be applied, as opposed to using the
-     * order of the lookups in the font.
+     * The length of the feature map.
      *
      * @internal
      */
-    const LETag *fFeatureOrder;
+    le_int32 fFeatureMapCount;
+
+    /**
+     * <code>TRUE</code> if the features in the
+     * feature map are in the order in which they
+     * must be applied.
+     *
+     * @internal
+     */
+    le_bool fFeatureOrder;
 
     /**
      * The address of the GSUB table.
@@ -197,6 +230,13 @@ protected:
      * @internal
      */
     LETag fScriptTag;
+  
+    /**
+     * The four byte script tag for V2 fonts.
+     *
+     * @internal
+     */
+    LETag fScriptTagV2;
 
     /**
      * The four byte language tag
@@ -264,6 +304,8 @@ protected:
      */
     virtual le_int32 glyphProcessing(const LEUnicode chars[], le_int32 offset, le_int32 count, le_int32 max, le_bool rightToLeft,
             LEGlyphStorage &glyphStorage, LEErrorCode &success);
+ 
+    virtual le_int32 glyphSubstitution(le_int32 count, le_int32 max, le_bool rightToLeft, LEGlyphStorage &glyphStorage, LEErrorCode &success);
 
     /**
      * This method does any processing necessary to convert "fake"