/*
* Copyright (C) 2006 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;
/**
* Shader is the based class for objects that return horizontal spans of colors
* during drawing. A subclass of Shader is installed in a Paint calling
* paint.setShader(shader). After that any object (other than a bitmap) that is
* drawn with that paint will get its color(s) from the shader.
*/
public class Shader {
// this is set by subclasses, but don't make it public
/* package */ int native_instance;
public enum TileMode {
/**
* replicate the edge color if the shader draws outside of its
* original bounds
*/
CLAMP (0),
/**
* repeat the shader's image horizontally and vertically
*/
REPEAT (1),
/**
* repeat the shader's image horizontally and vertically, alternating
* mirror images so that adjacent images always seam
*/
MIRROR (2);
TileMode(int nativeInt) {
this.nativeInt = nativeInt;
}
final int nativeInt;
}
/**
* Return true if the shader has a non-identity local matrix.
* @param localM If not null, it is set to the shader's local matrix.
* @return true if the shader has a non-identity local matrix
*/
public boolean getLocalMatrix(Matrix localM) {
return nativeGetLocalMatrix(native_instance, localM.native_instance);
}
/**
* Set the shader's local matrix. Passing null will reset the shader's
* matrix to identity
* @param localM The shader's new local matrix, or null to specify identity
*/
public void setLocalMatrix(Matrix localM) {
nativeSetLocalMatrix(native_instance,
localM != null ? localM.native_instance : 0);
}
protected void finalize() throws Throwable {
nativeDestructor(native_instance);
}
private static native void nativeDestructor(int native_shader);
private static native boolean nativeGetLocalMatrix(int native_shader,
int matrix_instance);
private static native void nativeSetLocalMatrix(int native_shader,
int matrix_instance);
}