Add isCompatible() to RS Element.
BUG=4203264
Change-Id: Id68aead685f6cbc71c2fbe461cb38382e0563f43
diff --git a/graphics/java/android/renderscript/Element.java b/graphics/java/android/renderscript/Element.java
index 0c1ad2a..5a72dbe 100644
--- a/graphics/java/android/renderscript/Element.java
+++ b/graphics/java/android/renderscript/Element.java
@@ -32,8 +32,8 @@
* <p>Complex elements contain a list of sub-elements and names that
* represents a structure of data. The fields can be accessed by name
* from a script or shader. The memory layout is defined and ordered. Data
- * alignment is determinied by the most basic primitive type. i.e. a float4
- * vector will be alligned to sizeof(float) and not sizeof(float4). The
+ * alignment is determined by the most basic primitive type. i.e. a float4
+ * vector will be aligned to sizeof(float) and not sizeof(float4). The
* ordering of elements in memory will be the order in which they were added
* with each component aligned as necessary. No re-ordering will be done.</p>
*
@@ -584,6 +584,33 @@
}
/**
+ * Check if the current Element is compatible with another Element.
+ * Primitive Elements are compatible if they share the same underlying
+ * size and type (i.e. U8 is compatible with A_8). User-defined Elements
+ * must be equal in order to be compatible. This requires strict name
+ * equivalence for all sub-Elements (in addition to structural equivalence).
+ *
+ * @param e The Element to check compatibility with.
+ *
+ * @return boolean true if the Elements are compatible, otherwise false.
+ */
+ public boolean isCompatible(Element e) {
+ // Try strict BaseObj equality to start with.
+ if (this.equals(e)) {
+ return true;
+ }
+
+ // Ignore mKind because it is allowed to be different (user vs. pixel).
+ // We also ignore mNormalized because it can be different. The mType
+ // field must be non-null since we require name equivalence for
+ // user-created Elements.
+ return ((mSize == e.mSize) &&
+ (mType != null) &&
+ (mType == e.mType) &&
+ (mVectorSize == e.mVectorSize));
+ }
+
+ /**
* Builder class for producing complex elements with matching field and name
* pairs. The builder starts empty. The order in which elements are added
* is retained for the layout in memory.