Merge "Fix Layout.primaryIsTrailingPreviousAllLineOffsets"

core/java/android/text/Layout.java

@@ -1122,6 +1122,9 @@ public abstract class Layout {
             if (limit > lineEnd) {
                 limit = lineEnd;
             }
+            if (limit == start) {
+                continue;
+            }
             level[limit - lineStart - 1] =
                     (byte) ((runs[i + 1] >>> RUN_LEVEL_SHIFT) & RUN_LEVEL_MASK);
         }
@@ -1220,8 +1223,8 @@ public abstract class Layout {
     }
 
     /**
-     * Computes in linear time the results of calling
-     * #getHorizontal for all offsets on a line.
+     * Computes in linear time the results of calling #getHorizontal for all offsets on a line.
+     *
      * @param line The line giving the offsets we compute information for
      * @param clamped Whether to clamp the results to the width of the layout
      * @param primary Whether the results should be the primary or the secondary horizontal
@@ -1257,7 +1260,7 @@ public abstract class Layout {
         TextLine.recycle(tl);
 
         if (clamped) {
-            for (int offset = 0; offset <= wid.length; ++offset) {
+            for (int offset = 0; offset < wid.length; ++offset) {
                 if (wid[offset] > mWidth) {
                     wid[offset] = mWidth;
                 }

core/tests/coretests/src/android/text/LayoutTest.java

@@ -743,6 +743,9 @@ public class LayoutTest {
         assertPrimaryIsTrailingPrevious(
                 RTL + LRI + RTL + LTR + PDI + RTL,
                 new boolean[]{false, false, true, false, false, false, false});
+        assertPrimaryIsTrailingPrevious(
+                "",
+                new boolean[]{false});
     }
 }