1 /* 2 * Copyright (C) 2010 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 import com.android.layoutlib.bridge.impl.DelegateManager; 20 import com.android.tools.layoutlib.annotations.LayoutlibDelegate; 21 22 import android.graphics.Shader.TileMode; 23 24 /** 25 * Delegate implementing the native methods of android.graphics.Shader 26 * 27 * Through the layoutlib_create tool, the original native methods of Shader have been replaced 28 * by calls to methods of the same name in this delegate class. 29 * 30 * This class behaves like the original native implementation, but in Java, keeping previously 31 * native data into its own objects and mapping them to int that are sent back and forth between 32 * it and the original Shader class. 33 * 34 * This also serve as a base class for all Shader delegate classes. 35 * 36 * @see DelegateManager 37 * 38 */ 39 public abstract class Shader_Delegate { 40 41 // ---- delegate manager ---- 42 protected static final DelegateManager<Shader_Delegate> sManager = 43 new DelegateManager<Shader_Delegate>(Shader_Delegate.class); 44 45 // ---- delegate helper data ---- 46 47 // ---- delegate data ---- 48 private Matrix_Delegate mLocalMatrix = null; 49 50 // ---- Public Helper methods ---- 51 getDelegate(int nativeShader)52 public static Shader_Delegate getDelegate(int nativeShader) { 53 return sManager.getDelegate(nativeShader); 54 } 55 56 /** 57 * Returns the {@link TileMode} matching the given int. 58 * @param tileMode the tile mode int value 59 * @return the TileMode enum. 60 */ getTileMode(int tileMode)61 public static TileMode getTileMode(int tileMode) { 62 for (TileMode tm : TileMode.values()) { 63 if (tm.nativeInt == tileMode) { 64 return tm; 65 } 66 } 67 68 assert false; 69 return TileMode.CLAMP; 70 } 71 getJavaPaint()72 public abstract java.awt.Paint getJavaPaint(); isSupported()73 public abstract boolean isSupported(); getSupportMessage()74 public abstract String getSupportMessage(); 75 isValid()76 public boolean isValid() { 77 if (mLocalMatrix != null && mLocalMatrix.getAffineTransform().getDeterminant() == 0) { 78 return false; 79 } 80 81 return true; 82 } 83 84 // ---- native methods ---- 85 86 @LayoutlibDelegate nativeDestructor(int native_shader)87 /*package*/ static void nativeDestructor(int native_shader) { 88 sManager.removeJavaReferenceFor(native_shader); 89 } 90 91 @LayoutlibDelegate nativeGetLocalMatrix(int native_shader, int matrix_instance)92 /*package*/ static boolean nativeGetLocalMatrix(int native_shader, int matrix_instance) { 93 // get the delegate from the native int. 94 Shader_Delegate shaderDelegate = sManager.getDelegate(native_shader); 95 if (shaderDelegate == null) { 96 return false; 97 } 98 99 // get the (optional) out matrix. 100 Matrix_Delegate outMatrixDelegate = Matrix_Delegate.getDelegate(matrix_instance); 101 102 if (shaderDelegate.mLocalMatrix == null || shaderDelegate.mLocalMatrix.isIdentity()) { 103 if (outMatrixDelegate != null) { 104 outMatrixDelegate.reset(); 105 } 106 return false; 107 } 108 109 if (outMatrixDelegate != null) { 110 outMatrixDelegate.set(shaderDelegate.mLocalMatrix); 111 } 112 113 return true; 114 } 115 116 117 @LayoutlibDelegate nativeSetLocalMatrix(int native_shader, int matrix_instance)118 /*package*/ static void nativeSetLocalMatrix(int native_shader, int matrix_instance) { 119 // get the delegate from the native int. 120 Shader_Delegate shaderDelegate = sManager.getDelegate(native_shader); 121 if (shaderDelegate == null) { 122 return; 123 } 124 125 shaderDelegate.mLocalMatrix = Matrix_Delegate.getDelegate(matrix_instance); 126 } 127 128 // ---- Private delegate/helper methods ---- 129 getLocalMatrix()130 protected java.awt.geom.AffineTransform getLocalMatrix() { 131 if (mLocalMatrix != null) { 132 return mLocalMatrix.getAffineTransform(); 133 } 134 135 return new java.awt.geom.AffineTransform(); 136 } 137 } 138