[RenderScript] Update documentation for Allocation.setAutoPadding().

Bug: 26862970
Change-Id: I91b9205641a8bfb0b6fed903195257f5172d4227
(cherry picked from commit 4dadd8068cd8a4065abe1bb7d394a0d93861af9f)

1 files changed, 7 insertions, 1 deletions

diff --git a/support/java/src/android/support/v8/renderscript/Allocation.java b/support/java/src/android/support/v8/renderscript/Allocation.java
index c8a8854a..21a68a42 100644
--- a/support/java/src/android/support/v8/renderscript/Allocation.java
+++ b/support/java/src/android/support/v8/renderscript/Allocation.java
@@ -269,7 +269,13 @@ public class Allocation extends BaseObj {
     }
 
     /**
-     * Enable/Disable AutoPadding for Vec3 elements.
+     * Enable/Disable AutoPadding for Vec3 Elements.
+     *
+     * <p> Vec3 Elements, such as {@link Element#U8_3} are treated as Vec4 Elements
+     * with the fourth vector element used as padding. Enabling the AutoPadding feature
+     * will automatically add/remove the padding when you copy to/from an Allocation
+     * with a Vec3 Element.
+     * <p> By default: Disabled.
      *
      * @param useAutoPadding True: enable AutoPadding; False: disable AutoPadding
      *