com.twelvemonkeys.imageio.color.UInt32ColorModel Maven / Gradle / Ivy
/*
* Copyright (c) 2014, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.twelvemonkeys.imageio.color;
import java.awt.color.ColorSpace;
import java.awt.image.ComponentColorModel;
import java.awt.image.DataBuffer;
/**
* ComponentColorModel subclass that correctly handles full 32 bit {@code TYPE_INT} unsigned integral samples.
*
* @see
* ComponentColorModel.getNormalizedComponents() does not handle 32-bit TYPE_INT
*
* @author Harald Kuhr
* @author last modified by $Author: haraldk$
* @version $Id: UInt32ColorModel.java,v 1.0 24.01.11 17.51 haraldk Exp$
*/
public final class UInt32ColorModel extends ComponentColorModel {
public UInt32ColorModel(final ColorSpace cs, final boolean hasAlpha, boolean isAlphaPremultiplied) {
super(cs, hasAlpha, isAlphaPremultiplied, hasAlpha ? TRANSLUCENT : OPAQUE, DataBuffer.TYPE_INT);
}
@Override
public float[] getNormalizedComponents(final Object pixel, float[] normComponents, final int normOffset) {
// Implementation borrowed from super class, with modifications to allow 32 bit shifts and unsigned values.
int numComponents = getNumComponents();
if (normComponents == null) {
normComponents = new float[numComponents + normOffset];
}
// This class only supports DataBuffer.TYPE_INT, cast is safe
int[] ipixel = (int[]) pixel;
for (int c = 0, nc = normOffset; c < numComponents; c++, nc++) {
normComponents[nc] = ((float) (ipixel[c] & 0xffffffffl)) / ((float) ((1l << getComponentSize(c)) - 1));
}
int numColorComponents = getNumColorComponents();
if (hasAlpha() && isAlphaPremultiplied()) {
float alpha = normComponents[numColorComponents + normOffset];
if (alpha != 0.0f) {
float invAlpha = 1.0f / alpha;
for (int c = normOffset; c < numColorComponents + normOffset; c++) {
normComponents[c] *= invAlpha;
}
}
}
// TODO: We don't currently support color spaces that has min and max other than 0.0f and 1.0f respectively.
return normComponents;
}
}