color.java

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

package java.awt;


/**
 * Color - class to represent 8-8-8 RGB color values
 *
 * Copyright (c) 1998
 *   Transvirtual Technologies Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file.
 * @author P.C.Mehlitz
 */
public class Color
  implements java.io.Serializable
{
/* XXX implement serial form! */
	int rgbValue;
	int nativeValue = 0xffffffff;
	Color brighter;
	Color darker;
	final public static Color darkGray = new Color( (byte)64, (byte)64, (byte)64);
	final public static Color black = new Color( (byte)0, (byte)0, (byte)0);
	final public static Color red = new Color( (byte)255, (byte)0, (byte)0);
	final public static Color pink = new Color( (byte)255, (byte)175, (byte)175);
	final public static Color orange = new Color( (byte)255, (byte)200, (byte)0);
	final public static Color yellow = new Color( (byte)255, (byte)255, (byte)0);
	final public static Color green = new Color( (byte)0, (byte)255, (byte)0);
	final public static Color magenta = new Color( (byte)255, (byte)0, (byte)255);
	final public static Color cyan = new Color( (byte)0, (byte)255, (byte)255);
	final public static Color blue = new Color( (byte)0, (byte)0, (byte)255);
	final public static Color white = new Color( (byte)255, (byte)255, (byte)255);
	final public static Color lightGray = new Color( (byte)192, (byte)192, (byte)192);
	final public static Color gray = new Color( (byte)128, (byte)128, (byte)128);
	final private static long serialVersionUID = 118526816881161077L;

static {
	// Make sure all the static fields which have not been initialized completely
	// (because of the Color->Toolkit->Defaults cyclic classinit problem) now get their
	// native values

	// Defaults has to be initialized at least up to its 'RgbRequests' field
	// BEFORE we call Toolkit.clrGetPixelValue(), since the first call of this
	// native method queries Defaults.RgbRequests (as part of a PseudoColor init).
	// If the native side kicks off the Defaults clinit, this (probably) 
	// ends up in Defaults.clinit calling Color ctors before getting RgbRequests,
	// i.e. before it finishes color mapping. This would cause recursive
	// native color init 
	try {
		Class.forName("java.awt.Defaults");
	} catch (Exception _) {
	}

	gray.setNativeValue();
	darkGray.setNativeValue();
	black.setNativeValue();
	red.setNativeValue();
	pink.setNativeValue();
	orange.setNativeValue();
	yellow.setNativeValue();
	green.setNativeValue();
	magenta.setNativeValue();
	cyan.setNativeValue();
	blue.setNativeValue();
	white.setNativeValue();
	lightGray.setNativeValue();	
}

private Color ( byte r, byte g, byte b ) {
	// This is a iplementation quirk to overcome the Color->Toolkit->Defaults->Color
	// cyclic class init problem, which would end up in Defaults colors being still null
	// (all static Color field refs) because Color hasn't been initialized yet. This should
	// NOT be used outside of the Color initialization!! We accept this temp. inconsistency
	// of color objects only because it would be worse to keep  RgbRequests (which are
	// subsequently used throughout - and only in - Defaults) outside Defaults.
	// Make sure all objects initialized with this ctor are 'finished' with setNativeValue()
	// before they are used (e.g. in the static block)

	rgbValue = 0xff000000 | ((r & 0xff) << 16) | ((g & 0xff) << 8)  | (b & 0xff);
}

public Color ( float r, float g, float b ) {
	rgbValue = 0xff000000 |                      // const alpha channel
	           (((int)(r * 255) & 0xff) << 16) | 
	           (((int)(g * 255) & 0xff) << 8)  |
	            ((int)(b * 255) & 0xff);

	nativeValue = Toolkit.clrGetPixelValue( rgbValue);
}

public Color ( int rgb ) {
	rgbValue = rgb | 0xff000000;
	
	nativeValue = Toolkit.clrGetPixelValue( rgbValue);
}

public Color ( int r, int g, int b ) {
	rgbValue = 0xff000000 | ((r & 0xff) << 16) | ((g & 0xff) << 8)  | (b & 0xff);

	nativeValue = Toolkit.clrGetPixelValue( rgbValue);
}

public Color ( int r, int g, int b, int a ) {
	rgbValue = ((a & 0xff) << 24) | ((r & 0xff) << 16) | ((g & 0xff) << 8)  | (b & 0xff);

	nativeValue = Toolkit.clrGetPixelValue( rgbValue);
}

Color ( long pixRgb ) {
	rgbValue    = (int) (pixRgb & 0xffffffff);
	
	nativeValue = Toolkit.clrGetPixelValue( rgbValue);
}

/**
 * @rework
 */
public static int HSBtoRGB ( float hue, float sat, float bri ) {
	int   r, g, b, hi, bi, x, y, z;
	float hfrac;
	
	if ( bri == 0.0 ) {
		return 0xff000000;
	}
	else if ( sat == 0.0 ) {
		r = (int) (bri * 255 + 0.5f);
		return ((r << 16) | (r << 8) | r) | 0xff000000;
	}
	else {
		hue *= 6.0f;                 // remove scaling
		hi = (int) Math.floor( hue);
		if ( hi == 6 ) hi = 0;       // 360