Add support for Bitmap-backed Allocations in Java.

Change-Id: Iab38a275aa6cdac91c76fa0d134fbc1e8f387913
Bug: 7256604

1 files changed, 20 insertions, 0 deletions

diff --git a/graphics/java/android/renderscript/Allocation.java b/graphics/java/android/renderscript/Allocation.java
index e44a3ef50a6a..2ce2f33742fd 100644
--- a/graphics/java/android/renderscript/Allocation.java
+++ b/graphics/java/android/renderscript/Allocation.java
@@ -233,6 +233,10 @@ public class Allocation extends BaseObj {
         }
     }
 
+    private void setBitmap(Bitmap b) {
+        mBitmap = b;
+    }
+
     Allocation(int id, RenderScript rs, Type t, int usage) {
         super(id, rs);
         if ((usage & ~(USAGE_SCRIPT |
@@ -1151,6 +1155,22 @@ public class Allocation extends BaseObj {
         rs.validate();
         Type t = typeFromBitmap(rs, b, mips);
 
+        // enable optimized bitmap path only with no mipmap and script-only usage
+        if (mips == MipmapControl.MIPMAP_NONE &&
+            t.getElement().isCompatible(Element.RGBA_8888(rs)) &&
+            usage == USAGE_SCRIPT) {
+            int id = rs.nAllocationCreateBitmapBackedAllocation(t.getID(rs), mips.mID, b, usage);
+            if (id == 0) {
+                throw new RSRuntimeException("Load failed.");
+            }
+
+            // keep a reference to the Bitmap around to prevent GC
+            Allocation alloc = new Allocation(id, rs, t, usage);
+            alloc.setBitmap(b);
+            return alloc;
+        }
+
+
         int id = rs.nAllocationCreateFromBitmap(t.getID(rs), mips.mID, b, usage);
         if (id == 0) {
             throw new RSRuntimeException("Load failed.");