/*
 * @(#)MetalBumps.java	1.25 03/12/19
 *
 * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */

package javax.swing.plaf.metal;

import java.awt.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.*;
import java.util.*;

/**
 * Implements the bumps used throughout the Metal Look and Feel.
 * 
 * @version 1.25 12/19/03
 * @author Tom Santos
 * @author Steve Wilson
 */


class MetalBumps implements Icon {

    static final Color ALPHA = new Color(0, 0, 0, 0);

    protected int xBumps;
    protected int yBumps;
    protected Color topColor;
    protected Color shadowColor;
    protected Color backColor;

    protected static Vector buffers = new Vector();
    protected BumpBuffer buffer;
    
    public MetalBumps( Dimension bumpArea ) {
        this( bumpArea.width, bumpArea.height );
    }

    public MetalBumps( int width, int height ) {
        this(width, height, MetalLookAndFeel.getPrimaryControlHighlight(),
             MetalLookAndFeel.getPrimaryControlDarkShadow(),
             MetalLookAndFeel.getPrimaryControlShadow());
    }

    /**
     * Creates MetalBumps of the specified size with the specified colors.
     * If <code>newBackColor</code> is null, the background will be
     * transparent.
     */
    public MetalBumps( int width, int height,
		       Color newTopColor, Color newShadowColor, Color newBackColor ) {
        setBumpArea( width, height );
	setBumpColors( newTopColor, newShadowColor, newBackColor );
    }

    private BumpBuffer getBuffer(GraphicsConfiguration gc, Color aTopColor,
                                 Color aShadowColor, Color aBackColor) {
        if (buffer != null && buffer.hasSameConfiguration(
                              gc, aTopColor, aShadowColor, aBackColor)) {
            return buffer;
        }
        BumpBuffer result = null;

        Enumeration elements = buffers.elements();

	while ( elements.hasMoreElements() ) {
	    BumpBuffer aBuffer = (BumpBuffer)elements.nextElement();
	    if ( aBuffer.hasSameConfiguration(gc, aTopColor, aShadowColor,
                                              aBackColor)) {
	        result = aBuffer;
		break;
	    }
	}
        if (result == null) {
            result = new BumpBuffer(gc, topColor, shadowColor, backColor);
            buffers.addElement(result);
        }
	return result;
    }

    public void setBumpArea( Dimension bumpArea ) {
        setBumpArea( bumpArea.width, bumpArea.height );
    }

    public void setBumpArea( int width, int height ) {
        xBumps = width / 2;
	yBumps = height / 2;
    }

    public void setBumpColors( Color newTopColor, Color newShadowColor, Color newBackColor ) {
        topColor = newTopColor;
	shadowColor = newShadowColor;
        if (newBackColor == null) {
            backColor = ALPHA;
        }
        else {
            backColor = newBackColor;
        }
    }

    public void paintIcon( Component c, Graphics g, int x, int y ) {
        GraphicsConfiguration gc = (g instanceof Graphics2D) ?
                                     (GraphicsConfiguration)((Graphics2D)g).
                                     getDeviceConfiguration() : null;

        buffer = getBuffer(gc, topColor, shadowColor, backColor);

	int bufferWidth = buffer.getImageSize().width;
	int bufferHeight = buffer.getImageSize().height;
	int iconWidth = getIconWidth();
	int iconHeight = getIconHeight();
	int x2 = x + iconWidth;
	int y2 = y + iconHeight;
	int savex = x;

	while (y < y2) {
	    int h = Math.min(y2 - y, bufferHeight);
	    for (x = savex; x < x2; x += bufferWidth) {
		int w = Math.min(x2 - x, bufferWidth);
		g.drawImage(buffer.getImage(),
			    x, y, x+w, y+h,
			    0, 0, w, h,
			    null);
	    }
	    y += bufferHeight;
	}
    }

    public int getIconWidth() {
        return xBumps * 2;
    }

    public int getIconHeight() {
        return yBumps * 2;
    }
}


class BumpBuffer {

    static final int IMAGE_SIZE = 64;
    static Dimension imageSize = new Dimension( IMAGE_SIZE, IMAGE_SIZE );

    transient Image image;
    Color topColor;
    Color shadowColor;
    Color backColor;
    private GraphicsConfiguration gc;

    public BumpBuffer(GraphicsConfiguration gc, Color aTopColor,
                      Color aShadowColor, Color aBackColor) {
        this.gc = gc;
	topColor = aTopColor;
	shadowColor = aShadowColor;
	backColor = aBackColor;
        createImage();
        fillBumpBuffer();
    }

    public boolean hasSameConfiguration(GraphicsConfiguration gc,
                                        Color aTopColor, Color aShadowColor,
                                        Color aBackColor) {
        if (this.gc != null) {
            if (!this.gc.equals(gc)) {
                return false;
            }
        }
        else if (gc != null) {
            return false;
        }
	return topColor.equals( aTopColor )       &&
	       shadowColor.equals( aShadowColor ) &&
	       backColor.equals( aBackColor );
    }

    /**
     * Returns the Image containing the bumps appropriate for the passed in
     * <code>GraphicsConfiguration</code>.
     */
    public Image getImage() {
        return image;
    }

    public Dimension getImageSize() {
        return imageSize;
    }

    /**
     * Paints the bumps into the current image.
     */
    private void fillBumpBuffer() {
        Graphics g = image.getGraphics();

	g.setColor( backColor );
	g.fillRect( 0, 0, IMAGE_SIZE, IMAGE_SIZE );

	g.setColor(topColor);
	for (int x = 0; x < IMAGE_SIZE; x+=4) {
	    for (int y = 0; y < IMAGE_SIZE; y+=4) {
	        g.drawLine( x, y, x, y );
		g.drawLine( x+2, y+2, x+2, y+2);
	    }
	}

	g.setColor(shadowColor);
	for (int x = 0; x < IMAGE_SIZE; x+=4) {
	    for (int y = 0; y < IMAGE_SIZE; y+=4) {
	        g.drawLine( x+1, y+1, x+1, y+1 );
		g.drawLine( x+3, y+3, x+3, y+3);
	    }
	}
	g.dispose();
    }

    /**
     * Creates the image appropriate for the passed in
     * <code>GraphicsConfiguration</code>, which may be null.
     */
    private void createImage() {
        if (gc != null) {
            image = gc.createCompatibleImage(IMAGE_SIZE, IMAGE_SIZE,
                       (backColor != MetalBumps.ALPHA) ? Transparency.OPAQUE :
                       Transparency.BITMASK);
        }
        else {
            int cmap[] = { backColor.getRGB(), topColor.getRGB(),
                           shadowColor.getRGB() };
            IndexColorModel icm = new IndexColorModel(8, 3, cmap, 0, false,
                      (backColor == MetalBumps.ALPHA) ? 0 : -1,
                      DataBuffer.TYPE_BYTE);
            image = new BufferedImage(IMAGE_SIZE, IMAGE_SIZE,
                                      BufferedImage.TYPE_BYTE_INDEXED, icm);
        }
    }
}
