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package org.eclipse.swt.graphics;
import org.eclipse.swt.internal.motif.*;
import org.eclipse.swt.*;
/*
* Licensed Materials - Property of IBM,
* (c) Copyright IBM Corp. 1998, 2000 All Rights Reserved
*/
public final class Color {
/**
* The handle to the OS color resource.
* Warning: This field is platform dependent.
*/
public XColor handle;
/**
* The device where this image was created.
*/
Device device;
Color() {
}
public Color (Device device, int red, int green, int blue) {
init(device, red, green, blue);
}
public Color (Device device, RGB rgb) {
if (rgb == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(device, rgb.red, rgb.green, rgb.blue);
}
public void dispose() {
if (handle == null) return;
int xDisplay = device.xDisplay;
int pixel = handle.pixel;
if (device.colorRefCount != null) {
/* If this was the last reference, remove the color from the list */
if (--device.colorRefCount[pixel] == 0) {
device.xcolors[pixel] = null;
}
}
int colormap = OS.XDefaultColormap(xDisplay, OS.XDefaultScreen(xDisplay));
OS.XFreeColors(xDisplay, colormap, new int[] { pixel }, 1, 0);
device = null;
handle = null;
}
public boolean equals (Object object) {
if (object == this) return true;
if (!(object instanceof Color)) return false;
Color color = (Color)object;
XColor xColor = color.handle;
return device == color.device && handle.red == xColor.red &&
handle.green == xColor.green && handle.blue == xColor.blue;
}
public int getBlue () {
return (handle.blue >> 8) & 0xFF;
}
public int getGreen () {
return (handle.green >> 8) & 0xFF;
}
public int getRed () {
return (handle.red >> 8) & 0xFF;
}
public RGB getRGB () {
return new RGB((handle.red >> 8) & 0xFF, (handle.green >> 8) & 0xFF, (handle.blue >> 8) & 0xFF);
}
public int hashCode () {
return handle.red ^ handle.green ^ handle.blue;
}
void init(Device device, int red, int green, int blue) {
if (device == null) device = Device.getDevice();
if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
this.device = device;
if ((red > 255) || (red < 0) ||
(green > 255) || (green < 0) ||
(blue > 255) || (blue < 0)) {
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
XColor xColor = new XColor();
xColor.red = (short)((red & 0xFF) | ((red & 0xFF) << 8));
xColor.green = (short)((green & 0xFF) | ((green & 0xFF) << 8));
xColor.blue = (short)((blue & 0xFF) | ((blue & 0xFF) << 8));
handle = xColor;
int xDisplay = device.xDisplay;
int screen = OS.XDefaultScreen(xDisplay);
int colormap = OS.XDefaultColormap(xDisplay, screen);
/* 1. Try to allocate the color */
if (OS.XAllocColor(xDisplay, colormap, xColor) != 0) {
if (device.colorRefCount != null) {
/* Make a copy of the color to put in the colors array */
XColor colorCopy = new XColor();
colorCopy.red = xColor.red;
colorCopy.green = xColor.green;
colorCopy.blue = xColor.blue;
colorCopy.pixel = xColor.pixel;
device.xcolors[colorCopy.pixel] = colorCopy;
device.colorRefCount[xColor.pixel]++;
}
return;
}
/**
* 2. Allocation failed. Query the entire colormap and
* find the closest match which can be allocated.
* This should never occur on a truecolor display.
*/
Visual visual = new Visual();
OS.memmove(visual, OS.XDefaultVisual(xDisplay, screen), Visual.sizeof);
int mapEntries = visual.map_entries;
XColor[] queried = new XColor[mapEntries];
int[] distances = new int[mapEntries];
/**
* Query all colors in the colormap and calculate the distance
* from each to the desired color.
*/
for (int i = 0; i < mapEntries; i++) {
XColor color = new XColor();
color.pixel = i;
queried[i] = color;
OS.XQueryColor(xDisplay, colormap, color);
int r = red - ((color.red >> 8) & 0xFF);
int g = green - ((color.green >> 8) & 0xFF);
int b = blue - ((color.blue >> 8) & 0xFF);
distances[i] = r*r + g*g + b*b;
}
/**
* Try to allocate closest matching queried color.
* The allocation can fail if the closest matching
* color is allocated privately, so go through them
* in order of increasing distance.
*/
for (int i = 0; i < mapEntries; i++) {
int minDist = 0x30000;
int minIndex = 0;
for (int j = 0; j < mapEntries; j++) {
if (distances[j] < minDist) {
minDist = distances[j];
minIndex = j;
}
}
XColor queriedColor = queried[minIndex];
XColor osColor = new XColor();
osColor.red = queriedColor.red;
osColor.green = queriedColor.green;
osColor.blue = queriedColor.blue;
if (OS.XAllocColor(xDisplay, colormap, osColor) != 0) {
/* Allocation succeeded. Copy the fields into the handle */
xColor.red = osColor.red;
xColor.green = osColor.green;
xColor.blue = osColor.blue;
xColor.pixel = osColor.pixel;
if (device.colorRefCount != null) {
/* Put osColor in the colors array */
device.xcolors[osColor.pixel] = osColor;
device.colorRefCount[osColor.pixel]++;
}
return;
}
/* The allocation failed; matching color is allocated privately */
distances[minIndex] = 0x30000;
}
/**
* 3. Couldn't allocate any of the colors in the colormap.
* This means all colormap entries were allocated privately
* by other applications. Give up and allocate black.
*/
XColor osColor = new XColor();
OS.XAllocColor(xDisplay, colormap, osColor);
/* Copy the fields into the handle */
xColor.red = osColor.red;
xColor.green = osColor.green;
xColor.blue = osColor.blue;
xColor.pixel = osColor.pixel;
if (device.colorRefCount != null) {
/* Put osColor in the colors array */
device.xcolors[osColor.pixel] = osColor;
device.colorRefCount[osColor.pixel]++;
}
}
public boolean isDisposed() {
return handle == null;
}
public static Color motif_new(Device device, XColor xColor) {
if (device == null) device = Device.getDevice();
Color color = new Color();
color.handle = xColor;
color.device = device;
return color;
}
/**
* Return a string representation of the Color.
*
* @return a string representation of the Color
*/
public String toString () {
return "Color {" + getRed() + ", " + getGreen() + ", " + getBlue() + "}";
}
}
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