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/*
* 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.
*/
private long native_instance;
/**
* Initialization step that should be called by subclasses in their
* constructors. Calling again may result in memory leaks.
* @hide
*/
protected void init(long ni) {
native_instance = ni;
}
private Matrix mLocalMatrix;
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) {
if (mLocalMatrix != null) {
localM.set(mLocalMatrix);
return !mLocalMatrix.isIdentity();
}
return false;
}
/**
* 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) {
mLocalMatrix = localM;
native_instance = nativeSetLocalMatrix(native_instance,
localM == null ? 0 : localM.native_instance);
}
protected void finalize() throws Throwable {
try {
super.finalize();
} finally {
nativeDestructor(native_instance);
}
}
/**
* @hide
*/
protected Shader copy() {
final Shader copy = new Shader();
copyLocalMatrix(copy);
return copy;
}
/**
* @hide
*/
protected void copyLocalMatrix(Shader dest) {
if (mLocalMatrix != null) {
final Matrix lm = new Matrix();
getLocalMatrix(lm);
dest.setLocalMatrix(lm);
} else {
dest.setLocalMatrix(null);
}
}
/* package */ long getNativeInstance() {
return native_instance;
}
private static native void nativeDestructor(long native_shader);
private static native long nativeSetLocalMatrix(long native_shader, long matrix_instance);
}
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