/*
* Copyright 2006-2017 ICEsoft Technologies Canada Corp.
*
* 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 org.icepdf.core.pobjects.graphics;
import org.icepdf.core.pobjects.Name;
import org.icepdf.core.util.Library;
import java.awt.*;
import java.awt.color.ColorSpace;
import java.util.HashMap;
/**
* A CalGray colour space (PDF 1.1) is a special case of a single-component
* CIE-based colour space, known as a CIE-based A colour space. This type of
* space is the one-dimensional (and usually achromatic) analog of CIE-based
* ABC spaces. Colour values in a CIE-based A space shall have a single component,
* arbitrarily named A.Figure 23 illustrates the transformations of the A
* component to X, Y, and Z components of the CIE 1931 XYZ space.
*
* @since 5.0.1
*/
public class CalGray extends PColorSpace {
public static final Name WHITE_POINT_KEY = new Name("WhitePoint");
public static final Name GAMMA_KEY = new Name("Gamma");
public static final Name MATRIX_KEY = new Name("Matrix");
public static final Name CAL_GRAY_KEY = new Name("CalGray");
private static ColorSpace grayCS = ColorSpace.getInstance(ColorSpace.CS_GRAY);
protected float[] whitepoint = {
1, 1, 1
};
protected float gamma = 1.0f;
public CalGray(Library l, HashMap h) {
super(l, h);
java.util.List m = (java.util.List) h.get(WHITE_POINT_KEY);
if (m != null) {
for (int i = 0; i < 3; i++) {
whitepoint[i] = ((Number) m.get(i)).floatValue();
}
}
Object o = h.get(GAMMA_KEY);
if (o instanceof Float) {
gamma = (Float) o;
}
}
@Override
public Color getColor(float[] f, boolean fillAndStroke) {
float A = (float) Math.pow(f[0], gamma);
float X = whitepoint[0] * A;
float Y = whitepoint[1] * A;
float Z = whitepoint[2] * A;
if (X < 0) {
X = 0;
}
if (Y < 0) {
Y = 0;
}
if (Z < 0) {
Z = 0;
}
if (X > 1) {
X = 1;
}
if (Y > 1) {
Y = 1;
}
if (Z > 1) {
Z = 1;
}
Color tmp = new Color(grayCS, new float[]{Z, Y, Z}, 1.0f);
return tmp;
}
@Override
public int getNumComponents() {
return 1;
}
}