/*
Copyright (c) 2012 Emitrom LLC. All rights reserved.
For licensing questions, please contact us at licensing@emitrom.com
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 com.emitrom.lienzo.client.core.image;
import com.emitrom.lienzo.client.core.types.ImageData;
import com.emitrom.lienzo.shared.core.types.Color;
import com.emitrom.lienzo.shared.core.types.IColor;
import com.google.gwt.canvas.dom.client.CanvasPixelArray;
/**
* A class that allows for easy creation of a Color Luminosity based Image Filter.
*/
public class ColorLuminosityImageDataFilter extends RGBImageDataFilter
{
public ColorLuminosityImageDataFilter(int r, int g, int b)
{
super(r, g, b);
}
public ColorLuminosityImageDataFilter(IColor color)
{
super(color);
}
public ColorLuminosityImageDataFilter(String color)
{
super(Color.fromColorString(color));
}
@Override
public ImageData filter(ImageData source, boolean copy)
{
if (null == source)
{
return null;
}
final int length = ((source.getWidth() * source.getHeight()) * PIXEL_SZ);
if (copy)
{
source = source.copy();
}
final CanvasPixelArray data = source.getData();
if (null == data)
{
return source;
}
for (int i = 0; i < length; i += PIXEL_SZ)
{
double m = (((0.21 * data.get(i + R_OFFSET)) + (0.72 * data.get(i + G_OFFSET)) + (0.07 * data.get(i + B_OFFSET))) / 255.0);
data.set(i + R_OFFSET, (int) ((getR() * m) + 0.5));
data.set(i + G_OFFSET, (int) ((getG() * m) + 0.5));
data.set(i + B_OFFSET, (int) ((getB() * m) + 0.5));
}
return source;
}
}