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/*
* 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 color filter that transforms colors through a 4x5 color matrix. This filter
* can be used to change the saturation of pixels, convert from YUV to RGB, etc.
*
* @see ColorMatrix
*/
public class ColorMatrixColorFilter extends ColorFilter {
private final ColorMatrix mMatrix = new ColorMatrix();
/**
* Create a color filter that transforms colors through a 4x5 color matrix.
*
* @param matrix 4x5 matrix used to transform colors. It is copied into
* the filter, so changes made to the matrix after the filter
* is constructed will not be reflected in the filter.
*/
public ColorMatrixColorFilter(ColorMatrix matrix) {
mMatrix.set(matrix);
update();
}
/**
* Create a color filter that transforms colors through a 4x5 color matrix.
*
* @param array Array of floats used to transform colors, treated as a 4x5
* matrix. The first 20 entries of the array are copied into
* the filter. See ColorMatrix.
*/
public ColorMatrixColorFilter(float[] array) {
if (array.length < 20) {
throw new ArrayIndexOutOfBoundsException();
}
mMatrix.set(array);
update();
}
/**
* Returns the {@link ColorMatrix} used by this filter. The returned
* value is never null. Modifying the returned matrix does not have
* any effect until you call {@link #setColorMatrix(ColorMatrix)}.
*
* @see #setColorMatrix(ColorMatrix)
*
* @hide
*/
public ColorMatrix getColorMatrix() {
return mMatrix;
}
/**
* Specifies the color matrix used by this filter. If the specified
* color matrix is null, this filter's color matrix will be reset to
* the identity matrix.
*
* @param matrix A {@link ColorMatrix} or null
*
* @see #getColorMatrix()
* @see android.graphics.ColorMatrix#reset()
* @see #setColorMatrix(float[])
*
* @hide
*/
public void setColorMatrix(ColorMatrix matrix) {
if (matrix == null) {
mMatrix.reset();
} else if (matrix != mMatrix) {
mMatrix.set(matrix);
}
update();
}
/**
* Specifies the color matrix used by this filter. If the specified
* color matrix is null, this filter's color matrix will be reset to
* the identity matrix.
*
* @param array Array of floats used to transform colors, treated as a 4x5
* matrix. The first 20 entries of the array are copied into
* the filter. See {@link ColorMatrix}.
*
* @see #getColorMatrix()
* @see android.graphics.ColorMatrix#reset()
* @see #setColorMatrix(ColorMatrix)
*
* @throws ArrayIndexOutOfBoundsException if the specified array's
* length is < 20
*
* @hide
*/
public void setColorMatrix(float[] array) {
if (array == null) {
mMatrix.reset();
} else {
if (array.length < 20) {
throw new ArrayIndexOutOfBoundsException();
}
mMatrix.set(array);
}
update();
}
private void update() {
final float[] colorMatrix = mMatrix.getArray();
destroyFilter(native_instance);
native_instance = nativeColorMatrixFilter(colorMatrix);
}
private static native long nativeColorMatrixFilter(float[] array);
}
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