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package sun.awt;

import sun.awt.CustomCursor;
import java.awt.*;
import java.awt.image.*;
import sun.awt.image.ImageRepresentation;

A class to encapsulate a custom image-based cursor.
Author: Thomas Ball
See Also:
  • setCursor.setCursor
/** * A class to encapsulate a custom image-based cursor. * * @see Component#setCursor * @author Thomas Ball */
@SuppressWarnings("serial") // JDK-implementation class public abstract class X11CustomCursor extends CustomCursor { public X11CustomCursor(Image cursor, Point hotSpot, String name) throws IndexOutOfBoundsException { super(cursor, hotSpot, name); } protected void createNativeCursor(Image im, int[] pixels, int width, int height, int xHotSpot, int yHotSpot) { class CCount implements Comparable<CCount> { int color; int count; public CCount(int cl, int ct) { color = cl; count = ct; } public int compareTo(CCount cc) { return cc.count - count; } } int[] tmp = new int[pixels.length]; for (int i=0; i<pixels.length; i++) { if ((pixels[i] & 0xff000000) == 0) { tmp[i] = -1; } else { tmp[i] = pixels[i] & 0x00ffffff; } } java.util.Arrays.sort(tmp); int fc = 0x000000; int bc = 0xffffff; CCount[] cols = new CCount[pixels.length]; int is = 0; int numColors = 0; while ( is < pixels.length ) { if (tmp[is] != -1) { cols[numColors++] = new CCount(tmp[is], 1); break; } is ++; } for (int i = is+1; i < pixels.length; i++) { if (tmp[i] != cols[numColors-1].color) { cols[numColors++] = new CCount(tmp[i], 1); } else { cols[numColors-1].count ++; } } java.util.Arrays.sort(cols, 0, numColors); if (numColors > 0) fc = cols[0].color; int fcr = (fc >> 16) & 0x000000ff; int fcg = (fc >> 8) & 0x000000ff; int fcb = (fc >> 0) & 0x000000ff; int rdis = 0; int gdis = 0; int bdis = 0; for (int j = 1; j < numColors; j++) { int rr = (cols[j].color >> 16) & 0x000000ff; int gg = (cols[j].color >> 8) & 0x000000ff; int bb = (cols[j].color >> 0) & 0x000000ff; rdis = rdis + cols[j].count * rr; gdis = gdis + cols[j].count * gg; bdis = bdis + cols[j].count * bb; } int rest = pixels.length - ((numColors > 0) ? cols[0].count : 0); // 4653170 Avoid divide / zero exception if (rest > 0) { rdis = rdis / rest - fcr; gdis = gdis / rest - fcg; bdis = bdis / rest - fcb; } rdis = (rdis*rdis + gdis*gdis + bdis*bdis) / 2; // System.out.println(" rdis is "+ rdis); for (int j = 1; j < numColors; j++) { int rr = (cols[j].color >> 16) & 0x000000ff; int gg = (cols[j].color >> 8) & 0x000000ff; int bb = (cols[j].color >> 0) & 0x000000ff; if ( (rr-fcr)*(rr-fcr) + (gg-fcg)*(gg-fcg) + (bb-fcb)*(bb-fcb) >= rdis ) { bc = cols[j].color; break; } } int bcr = (bc >> 16) & 0x000000ff; int bcg = (bc >> 8) & 0x000000ff; int bcb = (bc >> 0) & 0x000000ff; // On Solaris 2.5.x, the above code for cursor of any size runs fine // but on Solaris 2.6, the width of a cursor has to be 8 divisible, // otherwise, the cursor could be displayed as garbaged. // To work around the 2.6 problem, the following code pads any cursor // with a transparent area to make a new cursor of width 8 multiples. // --- Bug 4148455 int wNByte = (width + 7)/8; int tNByte = wNByte * height; byte[] xorMask = new byte[tNByte]; byte[] andMask = new byte[tNByte]; for (int i = 0; i < width; i++) { int omask = 1 << (i % 8); for (int j = 0; j < height; j++) { int ip = j*width + i; int ibyte = j*wNByte + i/8; if ((pixels[ip] & 0xff000000) != 0) { andMask[ibyte] |= omask; } int pr = (pixels[ip] >> 16) & 0x000000ff; int pg = (pixels[ip] >> 8) & 0x000000ff; int pb = (pixels[ip] >> 0) & 0x000000ff; if ( (pr-fcr)*(pr-fcr) + (pg-fcg)*(pg-fcg) + (pb-fcb)*(pb-fcb) <= (pr-bcr)*(pr-bcr) + (pg-bcg)*(pg-bcg) + (pb-bcb)*(pb-bcb) ) { // show foreground color xorMask[ibyte] |= omask; } } } createCursor(xorMask, andMask, 8*wNByte, height, fc, bc, xHotSpot, yHotSpot); } protected abstract void createCursor(byte[] xorMask, byte[] andMask, int width, int height, int fcolor, int bcolor, int xHotSpot, int yHotSpot); }