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Android example source code file (ComposeShader.java)

This example Android source code file (ComposeShader.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

composeshader, shader, xfermode

The ComposeShader.java Android example source code

/*
 * Copyright (C) 2007 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.graphics;

/** A subclass of shader that returns the coposition of two other shaders, combined by
    an {@link android.graphics.Xfermode} subclass.
*/
public class ComposeShader extends Shader {
    /** Create a new compose shader, given shaders A, B, and a combining mode.
        When the mode is applied, it will be given the result from shader A as its
        "dst", and the result of from shader B as its "src".
        @param shaderA  The colors from this shader are seen as the "dst" by the mode
        @param shaderB  The colors from this shader are seen as the "src" by the mode
        @param mode     The mode that combines the colors from the two shaders. If mode
                        is null, then SRC_OVER is assumed.
    */
    public ComposeShader(Shader shaderA, Shader shaderB, Xfermode mode) {
        native_instance = nativeCreate1(shaderA.native_instance, shaderB.native_instance,
                                        (mode != null) ? mode.native_instance : 0);
    }

    /** Create a new compose shader, given shaders A, B, and a combining PorterDuff mode.
        When the mode is applied, it will be given the result from shader A as its
        "dst", and the result of from shader B as its "src".
        @param shaderA  The colors from this shader are seen as the "dst" by the mode
        @param shaderB  The colors from this shader are seen as the "src" by the mode
        @param mode     The PorterDuff mode that combines the colors from the two shaders.
    */
    public ComposeShader(Shader shaderA, Shader shaderB, PorterDuff.Mode mode) {
        native_instance = nativeCreate2(shaderA.native_instance, shaderB.native_instance,
                                        mode.nativeInt);
    }

    private static native int nativeCreate1(int native_shaderA, int native_shaderB, int native_mode);
    private static native int nativeCreate2(int native_shaderA, int native_shaderB, int porterDuffMode);
}

Other Android examples (source code examples)

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