Adding matrix class methods.
Change-Id: I597b1b3955e29921394909f302800034571e6a50
diff --git a/graphics/java/android/renderscript/Matrix2f.java b/graphics/java/android/renderscript/Matrix2f.java
index 4b5e61b..a575ca9 100644
--- a/graphics/java/android/renderscript/Matrix2f.java
+++ b/graphics/java/android/renderscript/Matrix2f.java
@@ -51,6 +51,52 @@
System.arraycopy(mMat, 0, src, 0, 4);
}
+ public void loadRotate(float rot) {
+ float c, s;
+ rot *= (float)(java.lang.Math.PI / 180.0f);
+ c = (float)java.lang.Math.cos(rot);
+ s = (float)java.lang.Math.sin(rot);
+ mMat[0] = c;
+ mMat[1] = -s;
+ mMat[2] = s;
+ mMat[3] = c;
+ }
+
+ public void loadScale(float x, float y) {
+ loadIdentity();
+ mMat[0] = x;
+ mMat[3] = y;
+ }
+ public void loadMultiply(Matrix2f lhs, Matrix2f rhs) {
+ for (int i=0 ; i<2 ; i++) {
+ float ri0 = 0;
+ float ri1 = 0;
+ for (int j=0 ; j<2 ; j++) {
+ float rhs_ij = rhs.get(i,j);
+ ri0 += lhs.get(j,0) * rhs_ij;
+ ri1 += lhs.get(j,1) * rhs_ij;
+ }
+ set(i,0, ri0);
+ set(i,1, ri1);
+ }
+ }
+
+ public void multiply(Matrix2f rhs) {
+ Matrix2f tmp = new Matrix2f();
+ tmp.loadMultiply(this, rhs);
+ load(tmp);
+ }
+ public void rotate(float rot) {
+ Matrix2f tmp = new Matrix2f();
+ tmp.loadRotate(rot);
+ multiply(tmp);
+ }
+ public void scale(float x, float y) {
+ Matrix2f tmp = new Matrix2f();
+ tmp.loadScale(x, y);
+ multiply(tmp);
+ }
+
final float[] mMat;
}