Move RenderScript from graphics/ to new fw/base subdirectory rs.

Change-Id: I30b6633578f063840e1bdbcc9ba513b727912a6d

rs/java/android/renderscript/Matrix2f.java

@@ -0,0 +1,193 @@
+/*
+ * Copyright (C) 2009-2012 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.renderscript;
+
+
+/**
+ * Class for exposing the native RenderScript rs_matrix2x2 type back to the Android system.
+ *
+ **/
+public class Matrix2f {
+
+    /**
+    * Creates a new identity 2x2 matrix
+    */
+    public Matrix2f() {
+        mMat = new float[4];
+        loadIdentity();
+    }
+
+    /**
+    * Creates a new matrix and sets its values from the given
+    * parameter
+    *
+    * @param dataArray values to set the matrix to, must be 4
+    *                  floats long
+    */
+    public Matrix2f(float[] dataArray) {
+        mMat = new float[4];
+        System.arraycopy(dataArray, 0, mMat, 0, mMat.length);
+    }
+
+    /**
+    * Return a reference to the internal array representing matrix
+    * values. Modifying this array will also change the matrix
+    *
+    * @return internal array representing the matrix
+    */
+    public float[] getArray() {
+        return mMat;
+    }
+
+    /**
+    * Returns the value for a given row and column
+    *
+    * @param x column of the value to return
+    * @param y row of the value to return
+    *
+    * @return value in the yth row and xth column
+    */
+    public float get(int x, int y) {
+        return mMat[x*2 + y];
+    }
+
+    /**
+    * Sets the value for a given row and column
+    *
+    * @param x column of the value to set
+    * @param y row of the value to set
+    */
+    public void set(int x, int y, float v) {
+        mMat[x*2 + y] = v;
+    }
+
+    /**
+    * Sets the matrix values to identity
+    */
+    public void loadIdentity() {
+        mMat[0] = 1;
+        mMat[1] = 0;
+
+        mMat[2] = 0;
+        mMat[3] = 1;
+    }
+
+    /**
+    * Sets the values of the matrix to those of the parameter
+    *
+    * @param src matrix to load the values from
+    */
+    public void load(Matrix2f src) {
+        System.arraycopy(src.getArray(), 0, mMat, 0, mMat.length);
+    }
+
+    /**
+    * Sets current values to be a rotation matrix of given angle
+    *
+    * @param rot rotation angle
+    */
+    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;
+    }
+
+    /**
+    * Sets current values to be a scale matrix of given dimensions
+    *
+    * @param x scale component x
+    * @param y scale component y
+    */
+    public void loadScale(float x, float y) {
+        loadIdentity();
+        mMat[0] = x;
+        mMat[3] = y;
+    }
+
+    /**
+    * Sets current values to be the result of multiplying two given
+    * matrices
+    *
+    * @param lhs left hand side matrix
+    * @param rhs right hand side matrix
+    */
+    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);
+        }
+    }
+
+    /**
+    * Post-multiplies the current matrix by a given parameter
+    *
+    * @param rhs right hand side to multiply by
+    */
+    public void multiply(Matrix2f rhs) {
+        Matrix2f tmp = new Matrix2f();
+        tmp.loadMultiply(this, rhs);
+        load(tmp);
+    }
+    /**
+    * Modifies the current matrix by post-multiplying it with a
+    * rotation matrix of given angle
+    *
+    * @param rot angle of rotation
+    */
+    public void rotate(float rot) {
+        Matrix2f tmp = new Matrix2f();
+        tmp.loadRotate(rot);
+        multiply(tmp);
+    }
+    /**
+    * Modifies the current matrix by post-multiplying it with a
+    * scale matrix of given dimensions
+    *
+    * @param x scale component x
+    * @param y scale component y
+    */
+    public void scale(float x, float y) {
+        Matrix2f tmp = new Matrix2f();
+        tmp.loadScale(x, y);
+        multiply(tmp);
+    }
+    /**
+    * Sets the current matrix to its transpose
+    */
+    public void transpose() {
+        float temp = mMat[1];
+        mMat[1] = mMat[2];
+        mMat[2] = temp;
+    }
+
+    final float[] mMat;
+}
+
+
+