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-rw-r--r--graphics/java/android/renderscript/Matrix2f.java196
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diff --git a/graphics/java/android/renderscript/Matrix2f.java b/graphics/java/android/renderscript/Matrix2f.java
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--- a/graphics/java/android/renderscript/Matrix2f.java
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-/*
- * 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;
-
-import java.lang.Math;
-import android.util.Log;
-
-
-/**
- * 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;
-}
-
-
-