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      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 
     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      */
     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 
     72     public abstract java.awt.Paint getJavaPaint();
     73     public abstract boolean isSupported();
     74     public abstract String getSupportMessage();
     75 
     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
     87     /*package*/ static void nativeDestructor(int native_shader) {
     88         sManager.removeJavaReferenceFor(native_shader);
     89     }
     90 
     91     @LayoutlibDelegate
     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
    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 
    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