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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 import libcore.util.NativeAllocationRegistry_Delegate;
     25 
     26 /**
     27  * Delegate implementing the native methods of android.graphics.Shader
     28  *
     29  * Through the layoutlib_create tool, the original native methods of Shader have been replaced
     30  * by calls to methods of the same name in this delegate class.
     31  *
     32  * This class behaves like the original native implementation, but in Java, keeping previously
     33  * native data into its own objects and mapping them to int that are sent back and forth between
     34  * it and the original Shader class.
     35  *
     36  * This also serve as a base class for all Shader delegate classes.
     37  *
     38  * @see DelegateManager
     39  *
     40  */
     41 public abstract class Shader_Delegate {
     42 
     43     // ---- delegate manager ----
     44     protected static final DelegateManager<Shader_Delegate> sManager =
     45             new DelegateManager<Shader_Delegate>(Shader_Delegate.class);
     46     private static long sFinalizer = -1;
     47 
     48     // ---- delegate helper data ----
     49 
     50     // ---- delegate data ----
     51     private Matrix_Delegate mLocalMatrix = null;
     52     private float mAlpha = 1.0f;
     53 
     54     // ---- Public Helper methods ----
     55 
     56     public static Shader_Delegate getDelegate(long nativeShader) {
     57         return sManager.getDelegate(nativeShader);
     58     }
     59 
     60     /**
     61      * Returns the {@link TileMode} matching the given int.
     62      * @param tileMode the tile mode int value
     63      * @return the TileMode enum.
     64      */
     65     public static TileMode getTileMode(int tileMode) {
     66         for (TileMode tm : TileMode.values()) {
     67             if (tm.nativeInt == tileMode) {
     68                 return tm;
     69             }
     70         }
     71 
     72         assert false;
     73         return TileMode.CLAMP;
     74     }
     75 
     76     public abstract java.awt.Paint getJavaPaint();
     77     public abstract boolean isSupported();
     78     public abstract String getSupportMessage();
     79 
     80     // ---- native methods ----
     81 
     82     @LayoutlibDelegate
     83     /*package*/ static long nativeGetFinalizer() {
     84         synchronized (Shader_Delegate.class) {
     85             if (sFinalizer == -1) {
     86                 sFinalizer = NativeAllocationRegistry_Delegate.createFinalizer(
     87                         sManager::removeJavaReferenceFor);
     88             }
     89         }
     90         return sFinalizer;
     91     }
     92 
     93     // ---- Private delegate/helper methods ----
     94 
     95     protected Shader_Delegate(long nativeMatrix) {
     96         setLocalMatrix(nativeMatrix);
     97     }
     98 
     99     public void setLocalMatrix(long nativeMatrix) {
    100         mLocalMatrix = Matrix_Delegate.getDelegate(nativeMatrix);
    101     }
    102 
    103     protected java.awt.geom.AffineTransform getLocalMatrix() {
    104         if (mLocalMatrix != null) {
    105             return mLocalMatrix.getAffineTransform();
    106         }
    107 
    108         return new java.awt.geom.AffineTransform();
    109     }
    110 
    111     public void setAlpha(float alpha) {
    112         mAlpha = alpha;
    113     }
    114 
    115     public float getAlpha() {
    116         return mAlpha;
    117     }
    118 }
    119