1 /* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package android.graphics; 18 19 /** 20 * Shader is the based class for objects that return horizontal spans of colors 21 * during drawing. A subclass of Shader is installed in a Paint calling 22 * paint.setShader(shader). After that any object (other than a bitmap) that is 23 * drawn with that paint will get its color(s) from the shader. 24 */ 25 public class Shader { 26 27 // this is set by subclasses, but don't make it public 28 /* package */ int native_instance; 29 30 public enum TileMode { 31 /** 32 * replicate the edge color if the shader draws outside of its 33 * original bounds 34 */ 35 CLAMP (0), 36 /** 37 * repeat the shader's image horizontally and vertically 38 */ 39 REPEAT (1), 40 /** 41 * repeat the shader's image horizontally and vertically, alternating 42 * mirror images so that adjacent images always seam 43 */ 44 MIRROR (2); 45 TileMode(int nativeInt)46 TileMode(int nativeInt) { 47 this.nativeInt = nativeInt; 48 } 49 final int nativeInt; 50 } 51 52 /** 53 * Return true if the shader has a non-identity local matrix. 54 * @param localM If not null, it is set to the shader's local matrix. 55 * @return true if the shader has a non-identity local matrix 56 */ getLocalMatrix(Matrix localM)57 public boolean getLocalMatrix(Matrix localM) { 58 return nativeGetLocalMatrix(native_instance, localM.native_instance); 59 } 60 61 /** 62 * Set the shader's local matrix. Passing null will reset the shader's 63 * matrix to identity 64 * @param localM The shader's new local matrix, or null to specify identity 65 */ setLocalMatrix(Matrix localM)66 public void setLocalMatrix(Matrix localM) { 67 nativeSetLocalMatrix(native_instance, 68 localM != null ? localM.native_instance : 0); 69 } 70 finalize()71 protected void finalize() throws Throwable { 72 nativeDestructor(native_instance); 73 } 74 nativeDestructor(int native_shader)75 private static native void nativeDestructor(int native_shader); nativeGetLocalMatrix(int native_shader, int matrix_instance)76 private static native boolean nativeGetLocalMatrix(int native_shader, 77 int matrix_instance); nativeSetLocalMatrix(int native_shader, int matrix_instance)78 private static native void nativeSetLocalMatrix(int native_shader, 79 int matrix_instance); 80 } 81