FOP-2827: Add support for Khmer complex script

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@1846994 13f79535-47bb-0310-9956-ffa450edef68

Author: simonsteiner1984

fop-core/src/main/java/org/apache/fop/complexscripts/fonts/GlyphPositioningTable.java

@@ -731,7 +731,8 @@ public boolean position(GlyphPositioningState ps) {
                 if (ma != null) {
                     for (int i = 0, n = ps.getPosition(); i < n; i++) {
                         int gi = ps.getGlyph(-(i + 1));
-                        if (ps.isMark(gi)) {
+                        int unprocessedGlyph = ps.getUnprocessedGlyph(-(i + 1));
+                        if (ps.isMark(gi) && ps.isMark(unprocessedGlyph)) {
                             continue;
                         } else {
                             Anchor a = getBaseAnchor(gi, ma.getMarkClass());
@@ -743,6 +744,9 @@ public boolean position(GlyphPositioningState ps) {
                                     v.adjust(0, 0, -ps.getWidth(giMark), 0);
                                 }
                                 // end experimental fix for END OF AYAH in Lateef/Scheherazade
+                                if (OTFScript.KHMER.equals(ps.script)) {
+                                    v.adjust(-ps.getWidth(gi), -v.yPlacement, 0, 0);
+                                }
                                 if (ps.adjust(v)) {
                                     ps.setAdjusted(true);
                                 }
@@ -875,13 +879,13 @@ public boolean position(GlyphPositioningState ps) {
                 int mxc = getMaxComponentCount();
                 if (ma != null) {
                     for (int i = 0, n = ps.getPosition(); i < n; i++) {
-                        int gi = ps.getGlyph(-(i + 1));
-                        if (ps.isMark(gi)) {
+                        int glyphIndex = ps.getUnprocessedGlyph(-(i + 1));
+                        if (ps.isMark(glyphIndex)) {
                             continue;
                         } else {
-                            Anchor a = getLigatureAnchor(gi, mxc, i, ma.getMarkClass());
-                            if (a != null) {
-                                if (ps.adjust(a.getAlignmentAdjustment(ma))) {
+                            Anchor anchor = getLigatureAnchor(glyphIndex, mxc, i, ma.getMarkClass());
+                            if (anchor != null) {
+                                if (ps.adjust(anchor.getAlignmentAdjustment(ma))) {
                                     ps.setAdjusted(true);
                                 }
                             }
@@ -1033,9 +1037,9 @@ public boolean position(GlyphPositioningState ps) {
                 MarkAnchor ma = getMark1Anchor(ciMark1, giMark1);
                 if (ma != null) {
                     if (ps.hasPrev()) {
-                        Anchor a = getMark2Anchor(ps.getGlyph(-1), ma.getMarkClass());
-                        if (a != null) {
-                            if (ps.adjust(a.getAlignmentAdjustment(ma))) {
+                        Anchor anchor = getMark2Anchor(ps.getUnprocessedGlyph(-1), ma.getMarkClass());
+                        if (anchor != null) {
+                            if (ps.adjust(anchor.getAlignmentAdjustment(ma))) {
                                 ps.setAdjusted(true);
                             }
                         }

fop-core/src/main/java/org/apache/fop/complexscripts/fonts/GlyphProcessingState.java

@@ -413,6 +413,15 @@ public int getGlyph(int offset) throws IndexOutOfBoundsException {
         }
     }
 
+    public int getUnprocessedGlyph(int offset) throws IndexOutOfBoundsException {
+        int i = index + offset;
+        if ((i >= 0) && (i < indexLast)) {
+            return igs.getUnprocessedGlyph(i);
+        } else {
+            throw new IndexOutOfBoundsException("Attempting to process glyph at index " + i);
+        }
+    }
+
     /**
      * Obtain glyph at current position.
      * @return glyph at current position

fop-core/src/main/java/org/apache/fop/complexscripts/fonts/GlyphSubstitutionTable.java

@@ -31,6 +31,7 @@
 import org.apache.fop.complexscripts.util.CharAssociation;
 import org.apache.fop.complexscripts.util.GlyphSequence;
 import org.apache.fop.complexscripts.util.GlyphTester;
+import org.apache.fop.fonts.MultiByteFont;
 
 // CSOFF: LineLengthCheck
 
@@ -105,6 +106,11 @@ public GlyphSequence substitute(GlyphSequence gs, String script, String language
         return ogs;
     }
 
+    public CharSequence preProcess(CharSequence charSequence, String script, MultiByteFont font, List associations) {
+        ScriptProcessor scriptProcessor = ScriptProcessor.getInstance(script, processors);
+        return scriptProcessor.preProcess(charSequence, font, associations);
+    }
+
     /**
      * Map a lookup type name to its constant (integer) value.
      * @param name lookup type name

fop-core/src/main/java/org/apache/fop/complexscripts/scripts/IndicScriptProcessor.java

@@ -130,6 +130,8 @@ public static ScriptProcessor makeProcessor(String script) {
         case CharScript.SCRIPT_TAMIL:
         case CharScript.SCRIPT_TAMIL_2:
             return new TamilScriptProcessor(script);
+        case CharScript.SCRIPT_KHMER:
+            return new KhmerScriptProcessor(script);
         // [TBD] implement other script processors
         default:
             return new IndicScriptProcessor(script);
@@ -239,6 +241,7 @@ private GlyphSequence unsyllabize(GlyphSequence gs, GlyphSequence[] sa) {
         "rkrf",
         "rphf",
         "vatu",
+        "ccmp"
     };
     static {
         basicShapingFeatures = new HashSet<String>();
@@ -261,6 +264,7 @@ private boolean isBasicShapingUse(GlyphTable.UseSpec us) {
         "haln",
         "pres",
         "psts",
+        "clig"
     };
     static {
         presentationFeatures = new HashSet<String>();