package org.eclipse.swt.graphics;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved
 */

import org.eclipse.swt.internal.*;
import org.eclipse.swt.internal.win32.*;
import org.eclipse.swt.*;

/**
 * Class <code>GC</code> is where all of the drawing capabilities that are 
 * supported by SWT are located. Instances are used to draw on either an 
 * <code>Image</code>, a <code>Control</code>, or directly on a <code>Display</code>.
 * <p>
 * Application code must explicitly invoke the <code>GC.dispose()</code> 
 * method to release the operating system resources managed by each instance
 * when those instances are no longer required. This is <em>particularly</em>
 * important on Windows95 and Windows98 where the operating system has a limited
 * number of device contexts available.
 * </p>
 *
 * @see org.eclipse.swt.events.PaintEvent
 */

public final class GC {
	
	/**
	 * the handle to the OS device context
	 * (Warning: This field is platform dependent)
	 */
	public int handle;

	Drawable drawable;
	GCData data;
	
	/**
	 * A pre-converted string containing a space character.
	 */
	static final byte [] SPACE = new byte [] {(byte)' '};

/**
 * Prevents uninitialized instances from being created outside the package.
 */
GC() {
}

/**	 
 * Constructs a new instance of this class which has been
 * configured to draw on the specified drawable. Sets the
 * foreground and background color in the GC to match those
 * in the drawable.
 * <p>
 * You must dispose the graphics context when it is no longer required. 
 * </p>
 * @param drawable the drawable to draw on
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the drawable is null</li>
 *    <li>ERROR_INVALID_ARGUMENT
 *          - if the drawable is an image that is not a bitmap or an icon
 *          - if the drawable is an image or printer that is already selected
 *            into another graphics context</li>
 * </ul>
 */
public GC(Drawable drawable) {
	if (drawable == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	GCData data = new GCData ();
	int hDC = drawable.internal_new_GC (data);
	Device device = data.device;
	if (device == null) device = Device.getDevice();
	if (device == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	data.device = device;
	init (drawable, data, hDC);
	if (device.tracking) device.new_Object(this);	
}

/**
 * Copies a rectangular area of the receiver at the specified
 * position into the image, which must be of type <code>SWT.BITMAP</code>.
 *
 * @param x the x coordinate in the receiver of the area to be copied
 * @param y the y coordinate in the receiver of the area to be copied
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the image is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the image is not a bitmap or has been disposed</li> 
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void copyArea(Image image, int x, int y) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (image == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (image.type != SWT.BITMAP || image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	
	/* Get the HDC for the device */
	Device device = data.device;
 	int hDC = device.internal_new_GC(null);
 	
 	/* Copy the bitmap area */
	Rectangle rect = image.getBounds(); 	
	int memHdc = OS.CreateCompatibleDC(hDC);
	int hOldBitmap = OS.SelectObject(memHdc, image.handle);
	OS.BitBlt(memHdc, 0, 0, rect.width, rect.height, handle, x, y, OS.SRCCOPY);
	OS.SelectObject(memHdc, hOldBitmap);
	OS.DeleteDC(memHdc);
	
	/* Release the HDC for the device */
	device.internal_dispose_GC(hDC, null);
}

/**
 * Copies a rectangular area of the receiver at the source
 * position onto the receiver at the destination position.
 *
 * @param srcX the x coordinate in the receiver of the area to be copied
 * @param srcY the y coordinate in the receiver of the area to be copied
 * @param width the width of the area to copy
 * @param height the height of the area to copy
 * @param destX the x coordinate in the receiver of the area to copy to
 * @param destY the y coordinate in the receiver of the area to copy to
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void copyArea(int srcX, int srcY, int width, int height, int destX, int destY) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hwnd = OS.WindowFromDC(handle);
	if (hwnd == 0) {
		OS.BitBlt(handle, destX, destY, width, height, handle, srcX, srcY, OS.SRCCOPY);
	} else {
		RECT lprcClip = null;
		int hrgn = OS.CreateRectRgn(0, 0, 0, 0);
		if (OS.GetClipRgn(handle, hrgn) == 1) {
			lprcClip = new RECT();
			OS.GetRgnBox(hrgn, lprcClip);
		}
		OS.DeleteObject(hrgn);
		RECT lprcScroll = new RECT();
		OS.SetRect(lprcScroll, srcX, srcY, srcX + width, srcY + height);
		OS.ScrollWindowEx(hwnd, destX - srcX, destY - srcY, lprcScroll, lprcClip, 0, null, OS.SW_INVALIDATE | OS.SW_ERASE);
	}
}

int createDIB(int width, int height, int depth) {
	byte[]	bmi = new byte[40];
		
	/* DWORD biSize = 40 */
	bmi[0] = 40; bmi[1] = 0; bmi[2] = 0; bmi[3] = 0;
	/* LONG biWidth = width */
	bmi[4] = (byte)(width & 0xFF);
	bmi[5] = (byte)((width >> 8) & 0xFF);
	bmi[6] = (byte)((width >> 16) & 0xFF);
	bmi[7] = (byte)((width >> 24) & 0xFF);
	/* LONG biHeight = height */
	bmi[8] = (byte)(-height & 0xFF);
	bmi[9] = (byte)((-height >> 8) & 0xFF);
	bmi[10] = (byte)((-height >> 16) & 0xFF);
	bmi[11] = (byte)((-height >> 24) & 0xFF);
	/* WORD biPlanes = 1 */
	bmi[12] = 1;
	bmi[13] = 0;
	/* WORD biBitCount = depth */
	bmi[14] = (byte)(depth & 0xFF);
	bmi[15] = (byte)((depth >> 8) & 0xFF);
	/* DWORD biCompression = BI_RGB = 0 */
	bmi[16] = bmi[17] = bmi[18] = bmi[19] = 0;
	/* DWORD biSizeImage = 0 (default) */
	bmi[20] = bmi[21] = bmi[22] = bmi[23] = 0;
	/* LONG biXPelsPerMeter = 0 */
	bmi[24] = bmi[25] = bmi[26] = bmi[27] = 0;
	/* LONG biYPelsPerMeter = 0 */
	bmi[28] = bmi[29] = bmi[30] = bmi[31] = 0;
	/* DWORD biClrUsed */
	bmi[32] = bmi[33] = bmi[34] = bmi[35] = 0;
	/* DWORD biClrImportant = 0 */
	bmi[36] = bmi[37] = bmi[38] = bmi[39] = 0;
	/* Set the rgb colors into the bitmap info */
	int[] pBits = new int[1];
	int hDib = OS.CreateDIBSection(0, bmi, OS.DIB_RGB_COLORS, pBits, 0, 0);
	if (hDib == 0) SWT.error(SWT.ERROR_NO_HANDLES);
	return hDib;
}

/**
 * Disposes of the operating system resources associated with
 * the graphics context. Applications must dispose of all GCs
 * which they allocate.
 */
public void dispose() {
	if (handle == 0) return;
	
	/*
	* The only way for pens and brushes to get
	* selected into the HDC is for the receiver to
	* create them. When we are destroying the
	* hDC we also destroy any pens and brushes that
	* we have allocated. This code assumes that it 
	* is OK to delete stock objects. This will 
	* happen when a GC is disposed and the user has 
	* not caused new pens or brushes to be allocated.
	*/
	int nullPen = OS.GetStockObject(OS.NULL_PEN);
	int oldPen = OS.SelectObject(handle, nullPen);
	OS.DeleteObject(oldPen);
	int nullBrush = OS.GetStockObject(OS.NULL_BRUSH);
	int oldBrush = OS.SelectObject(handle, nullBrush);
	OS.DeleteObject(oldBrush);
	
	/*
	* Put back the original bitmap into the device context.
	* This will ensure that we have not left a bitmap
	* selected in it when we delete the HDC.
	*/
	int hNullBitmap = data.hNullBitmap;
	if (hNullBitmap != 0) {
		OS.SelectObject(handle, hNullBitmap);
		data.hNullBitmap = 0;
	}
	Image image = data.image;
	if (image != null) image.memGC = null;
	
	/*
	* Dispose the HDC.
	*/
	Device device = data.device;
	drawable.internal_dispose_GC(handle, data);
	drawable = null;
	handle = 0;
	data.image = null;
	data.ps = null;
	if (device.tracking) device.dispose_Object(this);
	data.device = null;
	data = null;
}

/**
 * Draws the outline of a circular or elliptical arc 
 * within the specified rectangular area.
 * <p>
 * The resulting arc begins at <code>startAngle</code> and extends  
 * for <code>arcAngle</code> degrees, using the current color.
 * Angles are interpreted such that 0 degrees is at the 3 o'clock
 * position. A positive value indicates a counter-clockwise rotation
 * while a negative value indicates a clockwise rotation.
 * </p><p>
 * The center of the arc is the center of the rectangle whose origin 
 * is (<code>x</code>, <code>y</code>) and whose size is specified by the 
 * <code>width</code> and <code>height</code> arguments. 
 * </p><p>
 * The resulting arc covers an area <code>width + 1</code> pixels wide
 * by <code>height + 1</code> pixels tall.
 * </p>
 *
 * @param x the x coordinate of the upper-left corner of the arc to be drawn
 * @param y the y coordinate of the upper-left corner of the arc to be drawn
 * @param width the width of the arc to be drawn
 * @param height the height of the arc to be drawn
 * @param startAngle the beginning angle
 * @param arcAngle the angular extent of the arc, relative to the start angle
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if any of the width, height or endAngle is zero.</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawArc (int x, int y, int width, int height, int startAngle, int endAngle) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int x1, y1, x2, y2,tmp;
	boolean isNegative;
	double pi = 3.1415926535;
	double toRadians = 2 * pi / 360;
	if (width < 0) {
		x = x + width;
		width = -width;
	}
	if (height < 0) {
		y = y + height;
		height = -height;
	}
	if (width == 0 || height == 0 || endAngle == 0) {
		SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	if (endAngle >= 360 || endAngle <= -360) {
		x1 = x2 = x + width;
		y1 = y2 = y + height / 2;
	} else {
		isNegative = endAngle < 0;

		endAngle = endAngle + startAngle;
		if (isNegative) {
			// swap angles
		   	tmp = startAngle;
			startAngle = endAngle;
			endAngle = tmp;
		}
 		x1 = (int) (Math.cos(startAngle * toRadians) * width) + x + width/2;;
		y1 = (int) (-1 * Math.sin(startAngle * toRadians) * height) + y + height/2;

		x2 = (int) (Math.cos(endAngle * toRadians) * width) + x + width/2;
		y2 = (int) (-1 * Math.sin(endAngle * toRadians) * height) + y + height/2;

	}
	int nullBrush = OS.GetStockObject(OS.NULL_BRUSH);
	int oldBrush = OS.SelectObject(handle, nullBrush);
	OS.Arc(handle, x,y,x+width+1,y+height+1,x1,y1,x2,y2 );
	OS.SelectObject(handle,oldBrush);
}

/** 
 * Draws a rectangle, based on the specified arguments, which has
 * the appearance of the platform's <em>focus rectangle</em> if the
 * platform supports such a notion, and otherwise draws a simple
 * rectangle in the receiver's forground color.
 *
 * @param x the x coordinate of the rectangle
 * @param y the y coordinate of the rectangle
 * @param width the width of the rectangle
 * @param height the height of the rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawRectangle
 */	 
public void drawFocus (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	RECT rect = new RECT();
	OS.SetRect(rect, x, y, x + width, y + height);
	OS.DrawFocusRect(handle, rect);
}

/**
 * Draws the given image in the receiver at the specified
 * coordinates.
 *
 * @param image the image to draw
 * @param x the x coordinate of where to draw
 * @param y the y coordinate of where to draw
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the image is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the given coordinates are outside the bounds of the image</li>
 * @exception SWTError <ul>
 *    <li>ERROR_NO_HANDLES - if no handles are available to perform the operation</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawImage(Image image, int x, int y) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (image == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	drawImage(image, 0, 0, -1, -1, x, y, -1, -1, true);
}

/**
 * Copies a rectangular area from the source image into a (potentially
 * different sized) rectangular area in the receiver. If the source
 * and destination areas are of differing sizes, then the source
 * area will be stretched or shrunk to fit the destination area
 * as it is copied. The copy fails if any of the given coordinates
 * are negative or lie outside the bounds of their respective images.
 *
 * @param image the source image
 * @param srcX the x coordinate in the source image to copy from
 * @param srcY the y coordinate in the source image to copy from
 * @param srcWidth the width in pixels to copy from the source
 * @param srcHeight the height in pixels to copy from the source
 * @param destX the x coordinate in the destination to copy to
 * @param destY the y coordinate in the destination to copy to
 * @param destWidth the width in pixels of the destination rectangle
 * @param destHeight the height in pixels of the destination rectangle
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the image is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the image has been disposed</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the given coordinates are outside the bounds of their respective images</li>
 * </ul>
 * @exception SWTError <uo>
 *    <li>ERROR_NO_HANDLES - if no handles are available to perform the operation</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawImage(Image image, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (srcWidth == 0 || srcHeight == 0 || destWidth == 0 || destHeight == 0) return;
	if (srcX < 0 || srcY < 0 || srcWidth < 0 || srcHeight < 0 || destWidth < 0 || destHeight < 0) {
		SWT.error (SWT.ERROR_INVALID_ARGUMENT);
	}
	if (image == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (image.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	drawImage(image, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, false);	
}

void drawImage(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple) {
	switch (srcImage.type) {
		case SWT.BITMAP:
			drawBitmap(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple);
			break;
		case SWT.ICON:
			drawIcon(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple);
			break;
		default:
			SWT.error(SWT.ERROR_UNSUPPORTED_FORMAT);
	}
}

void drawIcon(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple) {
	/* Simple case: no stretching, entire icon */
	if (simple) {
		OS.DrawIconEx(handle, destX, destY, srcImage.handle, 0, 0, 0, 0, OS.DI_NORMAL);
		return;
	}

	/* Get the icon info */
	ICONINFO srcIconInfo = new ICONINFO();
	OS.GetIconInfo(srcImage.handle, srcIconInfo);

	/* Get the icon width and height */
	int hBitmap = srcIconInfo.hbmColor;
	if (hBitmap == 0) hBitmap = srcIconInfo.hbmMask;
	BITMAP bm = new BITMAP();
	OS.GetObject(hBitmap, BITMAP.sizeof, bm);
	int iconWidth = bm.bmWidth, iconHeight = bm.bmHeight;
	if (hBitmap == srcIconInfo.hbmMask) iconHeight /= 2;
	
	if (simple) {
		srcWidth = destWidth = iconWidth;
		srcHeight = destHeight = iconHeight;
	}

	/* Draw the icon */
	boolean failed = srcX + srcWidth > iconWidth || srcY + srcHeight > iconHeight;
	if (!failed) {
		simple = srcX == 0 && srcY == 0 &&
			srcWidth == destWidth && srcHeight == destHeight &&
			srcWidth == iconWidth && srcHeight == iconHeight;
		if (simple)	{
			/* Simple case: no stretching, entire icon */
			OS.DrawIconEx(handle, destX, destY, srcImage.handle, 0, 0, 0, 0, OS.DI_NORMAL);
		} else {
			/* Get the HDC for the device */
			Device device = data.device;
 			int hDC = device.internal_new_GC(null);
 	
 			/* Create the icon info and HDC's */
			ICONINFO newIconInfo = new ICONINFO();
			newIconInfo.fIcon = true;
			int srcHdc = OS.CreateCompatibleDC(hDC);
			int dstHdc = OS.CreateCompatibleDC(hDC);
						
			/* Blt the color bitmap */
			int srcColorY = srcY;
			int srcColor = srcIconInfo.hbmColor;
			if (srcColor == 0) {
				srcColor = srcIconInfo.hbmMask;
				srcColorY += iconHeight;
			}
			int oldSrcBitmap = OS.SelectObject(srcHdc, srcColor);
			newIconInfo.hbmColor = OS.CreateCompatibleBitmap(srcHdc, destWidth, destHeight);
			if (newIconInfo.hbmColor == 0) SWT.error(SWT.ERROR_NO_HANDLES);
			int oldDestBitmap = OS.SelectObject(dstHdc, newIconInfo.hbmColor);
			OS.SetStretchBltMode(dstHdc, OS.COLORONCOLOR);
			OS.StretchBlt(dstHdc, 0, 0, destWidth, destHeight, srcHdc, srcX, srcColorY, srcWidth, srcHeight, OS.SRCCOPY);

			/* Blt the mask bitmap */
			OS.SelectObject(srcHdc, srcIconInfo.hbmMask);
			newIconInfo.hbmMask = OS.CreateBitmap(destWidth, destHeight, 1, 1, null);
			if (newIconInfo.hbmMask == 0) SWT.error(SWT.ERROR_NO_HANDLES);
			OS.SelectObject(dstHdc, newIconInfo.hbmMask);
			OS.StretchBlt(dstHdc, 0, 0, destWidth, destHeight, srcHdc, srcX, srcY, srcWidth, srcHeight, OS.SRCCOPY);
			
			/* Select old bitmaps before creating the icon */			
			OS.SelectObject(srcHdc, oldSrcBitmap);
			OS.SelectObject(dstHdc, oldDestBitmap);
			
			/* Create the new icon */
			int hIcon = OS.CreateIconIndirect(newIconInfo);
			if (hIcon == 0) SWT.error(SWT.ERROR_NO_HANDLES);
			
			/* Draw the new icon */
			OS.DrawIconEx(handle, destX, destY, hIcon, destWidth, destHeight, 0, 0, OS.DI_NORMAL);
			
			/* Destroy the new icon and hdc's*/
			OS.DestroyIcon(hIcon);
			OS.DeleteObject(newIconInfo.hbmMask);
			OS.DeleteObject(newIconInfo.hbmColor);
			OS.DeleteDC(dstHdc);
			OS.DeleteDC(srcHdc);

			/* Release the HDC for the device */
			device.internal_dispose_GC(hDC, null);
		}
	}

	/* Free icon info */
	OS.DeleteObject(srcIconInfo.hbmMask);
	if (srcIconInfo.hbmColor != 0) {
		OS.DeleteObject(srcIconInfo.hbmColor);
	}
	
	if (failed) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}

void drawBitmap(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple) {
	BITMAP bm = new BITMAP();
	OS.GetObject(srcImage.handle, BITMAP.sizeof, bm);
	int imgWidth = bm.bmWidth;
	int imgHeight = bm.bmHeight;
	if (simple) {
		srcWidth = destWidth = imgWidth;
		srcHeight = destHeight = imgHeight;
	} else {
		if (srcX + srcWidth > imgWidth || srcY + srcHeight > imgHeight) {
			SWT.error (SWT.ERROR_INVALID_ARGUMENT);
		}
		simple = srcX == 0 && srcY == 0 && 
			srcWidth == destWidth && destWidth == imgWidth &&
			srcHeight == destHeight && destHeight == imgHeight;
	}
	boolean mustRestore = false;
	GC memGC = srcImage.memGC;
	if (memGC != null && !memGC.isDisposed()) {
		mustRestore = true;
		GCData data = memGC.data;
		if (data.hNullBitmap != 0) {
			OS.SelectObject(memGC.handle, data.hNullBitmap);
			data.hNullBitmap = 0;
		}
	}
	if (srcImage.alpha != -1 || srcImage.alphaData != null) {
		drawBitmapAlpha(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple, bm, imgWidth, imgHeight);
	} else if (srcImage.transparentPixel != -1) {
		drawBitmapTransparent(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple, bm, imgWidth, imgHeight);
	} else {
		drawBitmap(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple, bm, imgWidth, imgHeight);
	}
	if (mustRestore) {
		int hOldBitmap = OS.SelectObject(memGC.handle, srcImage.handle);
		memGC.data.hNullBitmap = hOldBitmap;
	}
}

void drawBitmapAlpha(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple, BITMAP bm, int imgWidth, int imgHeight) {
	/* Simple cases */
	if (srcImage.alpha == 0) return;
	if (srcImage.alpha == 255) {
		drawBitmap(srcImage, srcX, srcY, srcWidth, srcHeight, destX, destY, destWidth, destHeight, simple, bm, imgWidth, imgHeight);
		return;
	}

	/* Check clipping */
	Rectangle rect = getClipping();
	rect = rect.intersection(new Rectangle(destX, destY, destWidth, destHeight));
	if (rect.isEmpty()) return;

	/* 
	* Optimization.  Recalculate src and dest rectangles so that
	* only the clipping area is drawn.
	*/
	rect.width = Math.max(rect.width, (int)Math.ceil(destWidth / (float)srcWidth));
	rect.height = Math.max(rect.height, (int)Math.ceil(destHeight / (float)srcHeight));
	int sx1 = srcX + (((rect.x - destX) * srcWidth) / destWidth);
	int sx2 = srcX + ((((rect.x + rect.width) - destX) * srcWidth) / destWidth);
	int sy1 = srcY + (((rect.y - destY) * srcHeight) / destHeight);
	int sy2 = srcY + ((((rect.y + rect.height) - destY) * srcHeight) / destHeight);
	destX = rect.x;
	destY = rect.y;
	destWidth = rect.width;
	destHeight = rect.height;
	srcX = sx1;
	srcY = sy1;
	srcWidth = sx2 - sx1;
	srcHeight = sy2 - sy1;
	
	/* Create resources */
	int srcHdc = OS.CreateCompatibleDC(handle);
	int oldSrcBitmap = OS.SelectObject(srcHdc, srcImage.handle);
	int memDib = createDIB(destWidth, destHeight, 32);
	int memHdc = OS.CreateCompatibleDC(handle);
	int oldMemBitmap = OS.SelectObject(memHdc, memDib);

	BITMAP dibBM = new BITMAP();
	OS.GetObject(memDib, BITMAP.sizeof, dibBM);
	int sizeInBytes = dibBM.bmWidthBytes * dibBM.bmHeight;

	/* Get the background pixels */
	OS.BitBlt(memHdc, 0, 0, destWidth, destHeight, handle, destX, destY, OS.SRCCOPY);
	byte[] destData = new byte[sizeInBytes];
	OS.MoveMemory(destData, dibBM.bmBits, sizeInBytes);

 	/* Get the foreground pixels */
	OS.SetStretchBltMode(memHdc, OS.COLORONCOLOR);
	OS.StretchBlt(memHdc, 0, 0, destWidth, destHeight, srcHdc, srcX, srcY, srcWidth, srcHeight, OS.SRCCOPY);
	byte[] srcData = new byte[sizeInBytes];
	OS.MoveMemory(srcData, dibBM.bmBits, sizeInBytes);

	/* Compose the pixels */
	int alpha = srcImage.alpha;
	byte[] alphaData = null;
	if (alpha == -1) {
		alphaData = new byte[destWidth * destHeight];
		ImageData.stretch8(srcImage.alphaData, imgWidth, srcX, srcY, srcWidth, srcHeight, alphaData, destWidth, 0, 0, destWidth, destHeight, null, false, false);
	}
	for (int i = 0; i < sizeInBytes; i += 4) {
		if (alphaData != null) alpha = alphaData[i / 4] & 0xff;
		destData[i] += ((srcData[i] & 0xFF) - (destData[i] & 0xFF)) * alpha / 255;
		destData[i+1] += ((srcData[i+1] & 0xFF) - (destData[i+1] & 0xFF)) * alpha / 255;
		destData[i+2] += ((srcData[i+2] & 0xFF) - (destData[i+2] & 0xFF)) * alpha / 255;
	}

	/* Draw the composed pixels */
	OS.MoveMemory(dibBM.bmBits, destData, sizeInBytes);
	OS.BitBlt(handle, destX, destY, destWidth, destHeight, memHdc, 0, 0, OS.SRCCOPY);

	/* Free resources */
	OS.SelectObject(memHdc, oldMemBitmap);
	OS.DeleteDC(memHdc);
	OS.DeleteObject(memDib);
	OS.SelectObject(srcHdc, oldSrcBitmap);
	OS.DeleteDC(srcHdc);
}

void drawBitmapTransparent(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple, BITMAP bm, int imgWidth, int imgHeight) {

	/* Get the HDC for the device */
	Device device = data.device;
 	int hDC = device.internal_new_GC(null);
 		
	/* Find the RGB values for the transparent pixel. */
	int transBlue = 0, transGreen = 0, transRed = 0;
	boolean isDib = bm.bmBits != 0;
	int hBitmap = srcImage.handle;
	int srcHdc = OS.CreateCompatibleDC(handle);
	int oldSrcBitmap = OS.SelectObject(srcHdc, hBitmap);
	byte[] originalColors = null;
	if (bm.bmBitsPixel <= 8) {
		if (isDib) {
			/* Palette-based DIBSECTION */
			int maxColors = 1 << bm.bmBitsPixel;
			byte[] oldColors = new byte[maxColors * 4];
			int numColors = OS.GetDIBColorTable(srcHdc, 0, maxColors, oldColors);
			int offset = srcImage.transparentPixel * 4;
			byte[] newColors = new byte[oldColors.length];
			transRed = transGreen = transBlue = 0xff;
			newColors[offset] = (byte)transBlue;
			newColors[offset+1] = (byte)transGreen;
			newColors[offset+2] = (byte)transRed;
			OS.SetDIBColorTable(srcHdc, 0, maxColors, newColors);
			originalColors = oldColors;
		} else {
			/* Palette-based bitmap */
			int numColors = 1 << bm.bmBitsPixel;
			byte[] bmi = new byte[40 + numColors * 4];
			/* Set the few fields necessary to get the RGB data out */
			bmi[0] = 40;
			bmi[12] = (byte)(bm.bmPlanes & 0xFF);
			bmi[13] = (byte)((bm.bmPlanes >> 8) & 0xFF);
			bmi[14] = (byte)(bm.bmBitsPixel & 0xFF);
			bmi[15] = (byte)((bm.bmBitsPixel >> 8) & 0xFF);
			OS.GetDIBits(srcHdc, srcImage.handle, 0, 0, 0, bmi, OS.DIB_RGB_COLORS);
			int offset = 40 + 4 * srcImage.transparentPixel;
			transRed = bmi[offset + 2] & 0xFF;
			transGreen = bmi[offset + 1] & 0xFF;
			transBlue = bmi[offset] & 0xFF;
		}
	} else {
		/* Direct color image */
		int pixel = srcImage.transparentPixel;
		switch (bm.bmBitsPixel) {
			case 16:
				transBlue = (pixel & 0x1F) << 3;
				transGreen = (pixel & 0x3E0) >> 2;
				transRed = (pixel & 0x7C00) >> 7;
				break;
			case 24:
				transBlue = (pixel & 0xFF0000) >> 16;
				transGreen = (pixel & 0xFF00) >> 8;
				transRed = pixel & 0xFF;
				break;
			case 32:
				transBlue = (pixel & 0xFF000000) >>> 24;
				transGreen = (pixel & 0xFF0000) >> 16;
				transRed = (pixel & 0xFF00) >> 8;
				break;
		}
	}

	/* Create the mask for the source image */
	int maskHdc = OS.CreateCompatibleDC(hDC);
	int maskBitmap = OS.CreateBitmap(srcWidth, srcHeight, 1, 1, null);
	int oldMaskBitmap = OS.SelectObject(maskHdc, maskBitmap);
	OS.SetBkColor(srcHdc, (transBlue << 16) | (transGreen << 8) | transRed);
	OS.BitBlt(maskHdc, 0, 0, srcWidth, srcHeight, srcHdc, 0, 0, OS.SRCCOPY);
	if (originalColors != null) OS.SetDIBColorTable(srcHdc, 0, 1 << bm.bmBitsPixel, originalColors);

	/* Draw the source bitmap transparently using invert/and mask/invert */
	int tempHdc = OS.CreateCompatibleDC(hDC);
	int tempBitmap = OS.CreateCompatibleBitmap(hDC, destWidth, destHeight);	
	int oldTempBitmap = OS.SelectObject(tempHdc, tempBitmap);
	OS.BitBlt(tempHdc, 0, 0, destWidth, destHeight, handle, destX, destY, OS.SRCCOPY);
	OS.SetStretchBltMode(tempHdc, OS.COLORONCOLOR);
	OS.StretchBlt(tempHdc, 0, 0, destWidth, destHeight, srcHdc, srcX, srcY, srcWidth, srcHeight, OS.SRCINVERT);
	OS.StretchBlt(tempHdc, 0, 0, destWidth, destHeight, maskHdc, srcX, srcY, srcWidth, srcHeight, OS.SRCAND);
	OS.StretchBlt(tempHdc, 0, 0, destWidth, destHeight, srcHdc, srcX, srcY, srcWidth, srcHeight, OS.SRCINVERT);
	OS.BitBlt(handle, destX, destY, destWidth, destHeight, tempHdc, 0, 0, OS.SRCCOPY);

	/* Release resources */
	OS.SelectObject(tempHdc, oldTempBitmap);
	OS.DeleteDC(tempHdc);
	OS.DeleteObject(tempBitmap);
	OS.SelectObject(maskHdc, oldMaskBitmap);
	OS.DeleteDC(maskHdc);
	OS.DeleteObject(maskBitmap);
	OS.SelectObject(srcHdc, oldSrcBitmap);
	if (hBitmap != srcImage.handle) OS.DeleteObject(hBitmap);
	OS.DeleteDC(srcHdc);
	
	/* Release the HDC for the device */
	device.internal_dispose_GC(hDC, null);
}

void drawBitmap(Image srcImage, int srcX, int srcY, int srcWidth, int srcHeight, int destX, int destY, int destWidth, int destHeight, boolean simple, BITMAP bm, int imgWidth, int imgHeight) {
	int srcHdc = OS.CreateCompatibleDC(handle);
	int oldSrcBitmap = OS.SelectObject(srcHdc, srcImage.handle);
	int bltRop = OS.SRCCOPY;
	if (OS.GetROP2(handle) == OS.R2_XORPEN) bltRop = OS.SRCINVERT;
	int oldStretchMode = OS.SetStretchBltMode(handle, OS.COLORONCOLOR);
	OS.StretchBlt(handle, destX, destY, destWidth, destHeight, srcHdc, srcX, srcY, srcWidth, srcHeight, bltRop);
	OS.SetStretchBltMode(handle, oldStretchMode);
	OS.SelectObject(srcHdc, oldSrcBitmap);
	OS.DeleteDC(srcHdc);
}

/** 
 * Draws a line, using the foreground color, between the points 
 * (<code>x1</code>, <code>y1</code>) and (<code>x2</code>, <code>y2</code>).
 *
 * @param x1 the first point's x coordinate
 * @param y1 the first point's y coordinate
 * @param x2 the second point's x coordinate
 * @param y2 the second point's y coordinate
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawLine (int x1, int y1, int x2, int y2) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	OS.MoveToEx (handle, x1, y1, 0);
	OS.LineTo (handle, x2, y2);
	OS.SetPixel (handle, x2, y2, OS.GetTextColor (handle));
}

/** 
 * Draws the outline of an oval, using the foreground color,
 * within the specified rectangular area.
 * <p>
 * The result is a circle or ellipse that fits within the 
 * rectangle specified by the <code>x</code>, <code>y</code>, 
 * <code>width</code>, and <code>height</code> arguments. 
 * </p><p> 
 * The oval covers an area that is <code>width + 1</code> 
 * pixels wide and <code>height + 1</code> pixels tall.
 * </p>
 *
 * @param x the x coordinate of the upper left corner of the oval to be drawn
 * @param y the y coordinate of the upper left corner of the oval to be drawn
 * @param width the width of the oval to be drawn
 * @param height the height of the oval to be drawn
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */	 
public void drawOval (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	// Check performance impact of always setting null brush. If the user has not
	// set the background color, we may not have to do this work?
	int nullBrush = OS.GetStockObject(OS.NULL_BRUSH);
	int oldBrush = OS.SelectObject(handle, nullBrush);
	OS.Ellipse(handle, x,y,x+width,y+height);
	OS.SelectObject(handle,oldBrush);
}

/** 
 * Draws the closed polygon which is defined by the specified array
 * of integer coordinates, using the receiver's foreground color. The array 
 * contains alternating x and y values which are considered to represent
 * points which are the vertices of the polygon. Lines are drawn between
 * each consecutive pair, and between the first pair and last pair in the
 * array.
 *
 * @param pointArray an array of alternating x and y values which are the vertices of the polygon
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT if pointArray is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawPolygon(int[] pointArray) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	int nullBrush = OS.GetStockObject(OS.NULL_BRUSH);
	int oldBrush = OS.SelectObject(handle, nullBrush);
	OS.Polygon(handle, pointArray, pointArray.length / 2);
	OS.SelectObject(handle, oldBrush);	
}

/** 
 * Draws the polyline which is defined by the specified array
 * of integer coordinates, using the receiver's foreground color. The array 
 * contains alternating x and y values which are considered to represent
 * points which are the corners of the polyline. Lines are drawn between
 * each consecutive pair, but not between the first pair and last pair in
 * the array.
 *
 * @param pointArray an array of alternating x and y values which are the corners of the polyline
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the point array is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawPolyline(int[] pointArray) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (pointArray == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	OS.Polyline(handle, pointArray, pointArray.length / 2);
}

/** 
 * Draws the outline of the rectangle specified by the arguments,
 * using the receiver's foreground color. The left and right edges
 * of the rectangle are at <code>x</code> and <code>x + width</code>. 
 * The top and bottom edges are at <code>y</code> and <code>y + height</code>. 
 *
 * @param x the x coordinate of the rectangle to be drawn
 * @param y the y coordinate of the rectangle to be drawn
 * @param width the width of the rectangle to be drawn
 * @param height the height of the rectangle to be drawn
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawRectangle (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hOld = OS.SelectObject (handle, OS.GetStockObject (OS.NULL_BRUSH));
	OS.Rectangle (handle, x, y, x + width + 1, y + height + 1);
	OS.SelectObject (handle, hOld);
}

/** 
 * Draws the outline of the specified rectangle, using the receiver's
 * foreground color. The left and right edges of the rectangle are at
 * <code>rect.x</code> and <code>rect.x + rect.width</code>. The top 
 * and bottom edges are at <code>rect.y</code> and 
 * <code>rect.y + rect.height</code>. 
 *
 * @param rect the rectangle to draw
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawRectangle (Rectangle rect) {
	if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	drawRectangle (rect.x, rect.y, rect.width, rect.height);
}

/** 
 * Draws the outline of the round-cornered rectangle specified by 
 * the arguments, using the receiver's foreground color. The left and
 * right edges of the rectangle are at <code>x</code> and <code>x + width</code>. 
 * The top and bottom edges are at <code>y</code> and <code>y + height</code>.
 * The <em>roundness</em> of the corners is specified by the 
 * <code>arcWidth</code> and <code>arcHeight</code> arguments. 
 *
 * @param x the x coordinate of the rectangle to be drawn
 * @param y the y coordinate of the rectangle to be drawn
 * @param width the width of the rectangle to be drawn
 * @param height the height of the rectangle to be drawn
 * @param arcWidth the horizontal diameter of the arc at the four corners
 * @param arcHeight the vertical diameter of the arc at the four corners
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawRoundRectangle (int x, int y, int width, int height, int arcWidth, int arcHeight) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int nullBrush = OS.GetStockObject(OS.NULL_BRUSH);
	int oldBrush = OS.SelectObject(handle, nullBrush);
	OS.RoundRect(handle, x,y,x+width,y+height, arcWidth, arcHeight);
	OS.SelectObject(handle,oldBrush);
}

/** 
 * Draws the given string, using the receiver's current font and
 * foreground color. No tab expansion or carriage return processing
 * will be performed. The background of the rectangular area where
 * the string is being drawn will be filled with the receiver's
 * background color.
 *
 * @param string the string to be drawn
 * @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
 * @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawString (String string, int x, int y) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	byte [] buffer = Converter.wcsToMbcs (0, string, false);
	OS.TextOut (handle, x, y, buffer, buffer.length);
}

/** 
 * Draws the given string, using the receiver's current font and
 * foreground color. No tab expansion or carriage return processing
 * will be performed. If <code>isTransparent</code> is <code>true</code>,
 * then the background of the rectangular area where the string is being
 * drawn will not be modified, otherwise it will be filled with the
 * receiver's background color.
 *
 * @param string the string to be drawn
 * @param x the x coordinate of the top left corner of the rectangular area where the string is to be drawn
 * @param y the y coordinate of the top left corner of the rectangular area where the string is to be drawn
 * @param isTransparent if <code>true</code> the background will be transparent, otherwise it will be opaque
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawString (String string, int x, int y, boolean isTransparent) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	byte [] buffer = Converter.wcsToMbcs (0, string, false);
	if (isTransparent) {
		int oldBkMode = OS.SetBkMode(handle, OS.TRANSPARENT);
		OS.TextOut (handle, x, y, buffer, buffer.length);
		OS.SetBkMode(handle, oldBkMode);
	} else {
		OS.TextOut (handle, x, y, buffer, buffer.length);
	}
}

/** 
 * Draws the given string, using the receiver's current font and
 * foreground color. Tab expansion and carriage return processing
 * are performed. The background of the rectangular area where
 * the text is being drawn will be filled with the receiver's
 * background color.
 *
 * @param string the string to be drawn
 * @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
 * @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawText (String string, int x, int y) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	RECT rect = new RECT();
	OS.SetRect(rect, x, y, 0x7FFF, 0x7FFF);
	byte [] buffer = Converter.wcsToMbcs(0, string, false);
	OS.DrawText(handle, buffer, buffer.length, rect, OS.DT_EXPANDTABS | OS.DT_LEFT | OS.DT_NOPREFIX);
}

/** 
 * Draws the given string, using the receiver's current font and
 * foreground color. Tab expansion and carriage return processing
 * are performed. If <code>isTransparent</code> is <code>true</code>,
 * then the background of the rectangular area where the text is being
 * drawn will not be modified, otherwise it will be filled with the
 * receiver's background color.
 *
 * @param string the string to be drawn
 * @param x the x coordinate of the top left corner of the rectangular area where the text is to be drawn
 * @param y the y coordinate of the top left corner of the rectangular area where the text is to be drawn
 * @param isTransparent if <code>true</code> the background will be transparent, otherwise it will be opaque
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void drawText (String string, int x, int y, boolean isTransparent) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	RECT rect = new RECT();
	OS.SetRect(rect, x, y, 0x7FFF, 0x7FFF);
	byte [] buffer = Converter.wcsToMbcs(0, string, false);
	if (isTransparent) {
		int oldBkMode = OS.SetBkMode(handle, OS.TRANSPARENT);
		OS.DrawText(handle, buffer, buffer.length, rect, OS.DT_EXPANDTABS | OS.DT_LEFT | OS.DT_NOPREFIX);
		OS.SetBkMode(handle, oldBkMode);
	} else {
		OS.DrawText(handle, buffer, buffer.length, rect, OS.DT_EXPANDTABS | OS.DT_LEFT | OS.DT_NOPREFIX);
	}
}

/**
 * Compares the argument to the receiver, and returns true
 * if they represent the <em>same</em> object using a class
 * specific comparison.
 *
 * @param object the object to compare with this object
 * @return <code>true</code> if the object is the same as this object and <code>false</code> otherwise
 *
 * @see #hashCode
 */
public boolean equals (Object object) {
	return (object == this) || ((object instanceof GC) && (handle == ((GC)object).handle));
}

/**
 * Fills the interior of a circular or elliptical arc within
 * the specified rectangular area, with the receiver's background
 * color.
 * <p>
 * The resulting arc begins at <code>startAngle</code> and extends  
 * for <code>arcAngle</code> degrees, using the current color.
 * Angles are interpreted such that 0 degrees is at the 3 o'clock
 * position. A positive value indicates a counter-clockwise rotation
 * while a negative value indicates a clockwise rotation.
 * </p><p>
 * The center of the arc is the center of the rectangle whose origin 
 * is (<code>x</code>, <code>y</code>) and whose size is specified by the 
 * <code>width</code> and <code>height</code> arguments. 
 * </p><p>
 * The resulting arc covers an area <code>width + 1</code> pixels wide
 * by <code>height + 1</code> pixels tall.
 * </p>
 *
 * @param x the x coordinate of the upper-left corner of the arc to be filled
 * @param y the y coordinate of the upper-left corner of the arc to be filled
 * @param width the width of the arc to be filled
 * @param height the height of the arc to be filled
 * @param startAngle the beginning angle
 * @param arcAngle the angular extent of the arc, relative to the start angle
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if any of the width, height or endAngle is zero.</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawArc
 */
public void fillArc (int x, int y, int width, int height, int startAngle, int endAngle) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int x1, y1, x2, y2,tmp;
	boolean isNegative;
	double pi = 3.1415926535;
	double toRadians = 2 * pi / 360;

	if (width < 0) {
		x = x + width;
		width = -width;
	}
	if (height < 0) {
		y = y + height;
		height = -height;
	}
	
	if (width == 0 || height == 0 || endAngle == 0) {
		SWT.error (SWT.ERROR_INVALID_ARGUMENT);
	}

	if (endAngle >= 360 || endAngle <= -360) {
		x1 = x2 = x + width;
		y1 = y2 = y + height / 2;
	} else {
		isNegative = endAngle < 0;

		endAngle = endAngle + startAngle;
		if (isNegative) {
			// swap angles
		   	tmp = startAngle;
			startAngle = endAngle;
			endAngle = tmp;
		}
 		x1 = (int) (Math.cos(startAngle * toRadians) * width) + x + width/2;;
		y1 = (int) (-1 * Math.sin(startAngle * toRadians) * height) + y + height/2;

		x2 = (int) (Math.cos(endAngle * toRadians) * width) + x + width/2;
		y2 = (int) (-1 * Math.sin(endAngle * toRadians) * height) + y + height/2;

	}

	int nullPen = OS.GetStockObject(OS.NULL_PEN);
	int oldPen = OS.SelectObject(handle, nullPen);
	OS.Pie(handle, x,y,x+width+1,y+height+1,x1,y1,x2,y2 );
	OS.SelectObject(handle,oldPen);
	
}

/** 
 * Fills the interior of an oval, within the specified
 * rectangular area, with the receiver's background
 * color.
 *
 * @param x the x coordinate of the upper left corner of the oval to be filled
 * @param y the y coordinate of the upper left corner of the oval to be filled
 * @param width the width of the oval to be filled
 * @param height the height of the oval to be filled
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawOval
 */	 
public void fillOval (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);

	/* Assumes that user sets the background color. */
	int nullPen = OS.GetStockObject(OS.NULL_PEN);
	int oldPen = OS.SelectObject(handle, nullPen);
	OS.Ellipse(handle, x,y,x+width,y+height);
	OS.SelectObject(handle,oldPen);
}

/** 
 * Fills the interior of the closed polygon which is defined by the
 * specified array of integer coordinates, using the receiver's
 * background color. The array contains alternating x and y values
 * which are considered to represent points which are the vertices of
 * the polygon. Lines are drawn between each consecutive pair, and
 * between the first pair and last pair in the array.
 *
 * @param pointArray an array of alternating x and y values which are the vertices of the polygon
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT if pointArray is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawPolygon	
 */
public void fillPolygon(int[] pointArray) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int nullPen = OS.GetStockObject(OS.NULL_PEN);
	int oldPen = OS.SelectObject(handle, nullPen);
	OS.Polygon(handle, pointArray, pointArray.length / 2);
	OS.SelectObject(handle,oldPen);	
}

/** 
 * Fills the interior of the rectangle specified by the arguments,
 * using the receiver's background color. 
 *
 * @param x the x coordinate of the rectangle to be filled
 * @param y the y coordinate of the rectangle to be filled
 * @param width the width of the rectangle to be filled
 * @param height the height of the rectangle to be filled
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawRectangle
 */
public void fillRectangle (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (OS.GetROP2(handle) == OS.R2_COPYPEN)
		OS.PatBlt (handle, x, y, width, height, OS.PATCOPY);
	else
		OS.PatBlt (handle, x, y, width, height, OS.PATINVERT);
}

/** 
 * Fills the interior of the specified rectangle, using the receiver's
 * background color. 
 *
 * @param rectangle the rectangle to be filled
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the rectangle is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawRectangle
 */
public void fillRectangle (Rectangle rect) {
	if (rect == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	fillRectangle (rect.x, rect.y, rect.width, rect.height);
}

/** 
 * Fills the interior of the round-cornered rectangle specified by 
 * the arguments, using the receiver's background color. 
 *
 * @param x the x coordinate of the rectangle to be filled
 * @param y the y coordinate of the rectangle to be filled
 * @param width the width of the rectangle to be filled
 * @param height the height of the rectangle to be filled
 * @param arcWidth the horizontal diameter of the arc at the four corners
 * @param arcHeight the vertical diameter of the arc at the four corners
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #drawRoundRectangle
 */
public void fillRoundRectangle (int x, int y, int width, int height, int arcWidth, int arcHeight) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int nullPen = OS.GetStockObject(OS.NULL_PEN);
	int oldPen = OS.SelectObject(handle, nullPen);
	OS.RoundRect(handle, x,y,x+width,y+height,arcWidth, arcHeight);
	OS.SelectObject(handle,oldPen);
}

/**
 * Returns the <em>advance width</em> of the specified character in
 * the font which is currently selected into the receiver.
 * <p>
 * The advance width is defined as the horizontal distance the cursor
 * should move after printing the character in the selected font.
 * </p>
 *
 * @param ch the character to measure
 * @return the distance in the x direction to move past the character before painting the next
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public int getAdvanceWidth(char ch) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	byte[] buffer = Converter.wcsToMbcs(0, new char[] { ch });
	int val = 0;
	for (int i = 0; i < buffer.length; i++) {
		val |= (buffer[i] & 0xFF) << (i * 8);
	}
	int[] width = new int[1];
	OS.GetCharWidth(handle, val, val, width);
	return width[0];
}

/** 
 * Returns the background color.
 *
 * @return the receiver's background color
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Color getBackground() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int color = OS.GetBkColor(handle);
	if (color == OS.CLR_INVALID) {
		color = OS.GetSysColor(OS.COLOR_WINDOW);
	}
	return Color.win32_new(data.device, color);
}

/**
 * Returns the width of the specified character in the font
 * selected into the receiver. 
 * <p>
 * The width is defined as the space taken up by the actual
 * character, not including the leading and tailing whitespace
 * or overhang.
 * </p>
 *
 * @param ch the character to measure
 * @return the width of the character
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public int getCharWidth(char ch) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	byte[] buffer = Converter.wcsToMbcs(0, new char[] { ch });
	int val = 0;
	for (int i = 0; i < buffer.length; i++) {
		val |= (buffer[i] & 0xFF) << (i * 8);
	}
	int[] width = new int[3];
	/* GetCharABCWidths only succeeds on truetype fonts */
	if (OS.GetCharABCWidths(handle, val, val, width)) {
		return width[1];
	}
	/* It wasn't a truetype font */
	TEXTMETRIC tm = new TEXTMETRIC();
	OS.GetTextMetrics(handle, tm);
	SIZE size = new SIZE();
	OS.GetTextExtentPoint32(handle, buffer, buffer.length, size);
	return size.cx - tm.tmOverhang;
}

/** 
 * Returns the bounding rectangle of the receiver's clipping
 * region. If no clipping region is set, the return value
 * will be a rectangle which covers the entire bounds of the
 * object the receiver is drawing on.
 *
 * @return the bounding rectangle of the clipping region
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Rectangle getClipping() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	RECT rect = new RECT();
	OS.GetClipBox(handle, rect);
	return new Rectangle(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
}

/** 
 * Sets the region managed by the argument to the current
 * clipping region of the receiver.
 *
 * @param region the region to fill with the clipping region
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the region is null</li>
 * </ul>	
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void getClipping (Region region) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (region == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	int result = OS.GetClipRgn (handle, region.handle);
	if (result == 1) return;
	RECT rect = new RECT();
	OS.GetClipBox(handle, rect);
	OS.SetRectRgn(region.handle, rect.left, rect.top, rect.right, rect.bottom);
}

/** 
 * Returns the font currently being used by the receiver
 * to draw and measure text.
 *
 * @return the receiver's font
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Font getFont () {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hFont = OS.GetCurrentObject(handle, OS.OBJ_FONT);
	return Font.win32_new(data.device, hFont);
}

/**
 * Returns a FontMetrics which contains information
 * about the font currently being used by the receiver
 * to draw and measure text.
 *
 * @return font metrics for the receiver's font
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public FontMetrics getFontMetrics() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	TEXTMETRIC lptm = new TEXTMETRIC();
	OS.GetTextMetrics(handle, lptm);
	return FontMetrics.win32_new(lptm);
}

/** 
 * Returns the receiver's foreground color.
 *
 * @return the color used for drawing foreground things
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Color getForeground() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int color = OS.GetTextColor(handle);
	if (color == OS.CLR_INVALID) {
		color = OS.GetSysColor(OS.COLOR_WINDOWTEXT);
	}
	return Color.win32_new(data.device, color);
}

/** 
 * Returns the receiver's line style, which will be one
 * of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>,
 * <code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or
 * <code>SWT.LINE_DASHDOTDOT<code>.
 *
 * @return the style used for drawing lines
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public int getLineStyle() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hPen = OS.GetCurrentObject(handle, OS.OBJ_PEN);
	LOGPEN logPen = new LOGPEN();
	OS.GetObject(hPen, LOGPEN.sizeof, logPen);
	switch (logPen.lopnStyle) {
		case OS.PS_SOLID:		return SWT.LINE_SOLID;
		case OS.PS_DASH:		return SWT.LINE_DASH;
		case OS.PS_DOT:			return SWT.LINE_DOT;
		case OS.PS_DASHDOT:		return SWT.LINE_DASHDOT;
		case OS.PS_DASHDOTDOT:	return SWT.LINE_DASHDOTDOT;
		default:				return SWT.LINE_SOLID;
	}
}

/** 
 * Returns the width that will be used when drawing lines
 * for all of the figure drawing operations (that is,
 * <code>drawLine</code>, <code>drawRectangle</code>, 
 * <code>drawPolyline</code>, and so forth.
 *
 * @return the receiver's line width 
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public int getLineWidth() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hPen = OS.GetCurrentObject(handle, OS.OBJ_PEN);
	LOGPEN logPen = new LOGPEN();
	OS.GetObject(hPen, LOGPEN.sizeof, logPen);
	return logPen.x;
}

/** 
 * Returns <code>true</code> if this GC is drawing in the mode
 * where the resulting color in the destination is the
 * <em>exclusive or</em> of the color values in the source
 * and the destination, and <code>false</code> if it is
 * drawing in the mode where the destination color is being
 * replaced with the source color value.
 *
 * @return <code>true</code> true if the receiver is in XOR mode, and false otherwise
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public boolean getXORMode() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	return OS.GetROP2(handle) == OS.R2_XORPEN;
}

void init(Drawable drawable, GCData data, int hDC) {
	int foreground = data.foreground;
	if (foreground != -1 && OS.GetTextColor(hDC) != foreground) {
		OS.SetTextColor(hDC, foreground);
		int hPen = OS.CreatePen(OS.PS_SOLID, 0, foreground);
		OS.SelectObject(hDC, hPen);
	}
	int background = data.background;
	if (background != -1 && OS.GetBkColor(hDC) != background) {
		OS.SetBkColor(hDC, background);
		int hBrush = OS.CreateSolidBrush(background);
		OS.SelectObject(hDC, hBrush);
	}
	int hFont = data.hFont;
	if (hFont != 0) OS.SelectObject (hDC, hFont);
	int hPalette = data.device.hPalette;
	if (hPalette != 0) {
		OS.SelectPalette(hDC, hPalette, true);
		OS.RealizePalette(hDC);
	}
	Image image = data.image;
	if (image != null) {
		data.hNullBitmap = OS.SelectObject(hDC, image.handle);
		image.memGC = this;
	}
	this.drawable = drawable;
	this.data = data;
	handle = hDC;
}

/**
 * Returns an integer hash code for the receiver. Any two 
 * objects which return <code>true</code> when passed to 
 * <code>equals</code> must return the same value for this
 * method.
 *
 * @return the receiver's hash
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 *
 * @see #equals
 */
public int hashCode () {
	return handle;
}

/**
 * Returns <code>true</code> if the receiver has a clipping
 * region set into it, and <code>false</code> otherwise.
 * If this method returns false, the receiver will draw on all
 * available space in the destination. If it returns true, 
 * it will draw only in the area that is covered by the region
 * that can be accessed with <code>getClipping(region)</code>.
 *
 * @return <code>true</code> if the GC has a clipping region, and <code>false</code> otherwise
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public boolean isClipped() {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int region = OS.CreateRectRgn(0, 0, 0, 0);
	int result = OS.GetClipRgn(handle, region);
	OS.DeleteObject(region);
	return (result > 0);
}

/**
 * Returns <code>true</code> if the GC has been disposed,
 * and <code>false</code> otherwise.
 * <p>
 * This method gets the dispose state for the GC.
 * When a GC has been disposed, it is an error to
 * invoke any other method using the GC.
 *
 * @return <code>true</code> when the GC is disposed and <code>false</code> otherwise
 */
public boolean isDisposed() {
	return handle == 0;
}

/**
 * Sets the background color. The background color is used
 * for fill operations and as the background color when text
 * is drawn.
 *
 * @param color the new background color for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the color is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the color has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setBackground (Color color) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	if (OS.GetBkColor(handle) == color.handle) return;
	OS.SetBkColor (handle, color.handle);
	int newBrush = OS.CreateSolidBrush (color.handle);
	int oldBrush = OS.SelectObject (handle, newBrush);
	OS.DeleteObject (oldBrush);
}

/**
 * Sets the area of the receiver which can be changed
 * by drawing operations to the rectangular area specified
 * by the arguments.
 *
 * @param x the x coordinate of the clipping rectangle
 * @param y the y coordinate of the clipping rectangle
 * @param width the width of the clipping rectangle
 * @param height the height of the clipping rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setClipping (int x, int y, int width, int height) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hRgn = OS.CreateRectRgn (x, y, x + width, y + height);
	OS.SelectClipRgn (handle, hRgn);
	OS.DeleteObject (hRgn);
}

/**
 * Sets the area of the receiver which can be changed
 * by drawing operations to the rectangular area specified
 * by the argument.
 *
 * @param rect the clipping rectangle
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setClipping (Rectangle rect) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (rect == null) {
		OS.SelectClipRgn (handle, 0);
		return;
	}
	setClipping (rect.x, rect.y, rect.width, rect.height);
}

/**
 * Sets the area of the receiver which can be changed
 * by drawing operations to the region specified
 * by the argument.
 *
 * @param rect the clipping region.
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setClipping (Region region) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hRegion = 0;
	if (region != null) hRegion = region.handle;
	OS.SelectClipRgn (handle, hRegion);
}

/** 
 * Sets the font which will be used by the receiver
 * to draw and measure text to the argument. If the
 * argument is null, then a default font appropriate
 * for the platform will be used instead.
 *
 * @param font the new font for the receiver, or null to indicate a default font
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */

public void setFont (Font font) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (font == null) {
		OS.SelectObject(handle, data.device.systemFont);
	} else {
		if (font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
		OS.SelectObject(handle, font.handle);
	}
}

/**
 * Sets the foreground color. The foreground color is used
 * for drawing operations including when text is drawn.
 *
 * @param color the new foreground color for the receiver
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the color is null</li>
 *    <li>ERROR_INVALID_ARGUMENT - if the color has been disposed</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setForeground (Color color) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (color == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
	if (color.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	if (OS.GetTextColor(handle) == color.handle) return;
	int hPen = OS.GetCurrentObject(handle, OS.OBJ_PEN);
	LOGPEN logPen = new LOGPEN();
	OS.GetObject(hPen, LOGPEN.sizeof, logPen);
	OS.SetTextColor (handle, color.handle);
	int newPen = OS.CreatePen (logPen.lopnStyle, logPen.x, color.handle);
	int oldPen = OS.SelectObject (handle, newPen);
	OS.DeleteObject (oldPen);
}

/** 
 * Sets the receiver's line style to the argument, which must be one
 * of the constants <code>SWT.LINE_SOLID</code>, <code>SWT.LINE_DASH</code>,
 * <code>SWT.LINE_DOT</code>, <code>SWT.LINE_DASHDOT</code> or
 * <code>SWT.LINE_DASHDOTDOT<code>.
 *
 * @param lineStyle the style to be used for drawing lines
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setLineStyle(int lineStyle) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int style = -1;
	switch (lineStyle) {
		case SWT.LINE_SOLID:      style = OS.PS_SOLID; break;
		case SWT.LINE_DASH:       style = OS.PS_DASH; break;
		case SWT.LINE_DOT:        style = OS.PS_DOT; break;
		case SWT.LINE_DASHDOT:    style = OS.PS_DASHDOT; break;
		case SWT.LINE_DASHDOTDOT: style = OS.PS_DASHDOTDOT; break;
		default:
			SWT.error(SWT.ERROR_INVALID_ARGUMENT);
	}
	int hPen = OS.GetCurrentObject(handle, OS.OBJ_PEN);
	LOGPEN logPen = new LOGPEN();
	OS.GetObject(hPen, LOGPEN.sizeof, logPen);
	if (logPen.lopnStyle == style) return;
	int newPen = OS.CreatePen(style, logPen.x, logPen.lopnColor);
	int oldPen = OS.SelectObject(handle, newPen);
	OS.DeleteObject(oldPen);
}

/** 
 * Sets the width that will be used when drawing lines
 * for all of the figure drawing operations (that is,
 * <code>drawLine</code>, <code>drawRectangle</code>, 
 * <code>drawPolyline</code>, and so forth.
 *
 * @param lineWidth the width of a line
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setLineWidth(int lineWidth) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	int hPen = OS.GetCurrentObject(handle, OS.OBJ_PEN);
	LOGPEN logPen = new LOGPEN();
	OS.GetObject(hPen, LOGPEN.sizeof, logPen);
	if (logPen.x == lineWidth) return;
	int newPen = OS.CreatePen(logPen.lopnStyle, lineWidth, logPen.lopnColor);
	int oldPen = OS.SelectObject(handle, newPen);
	OS.DeleteObject(oldPen);
}

/** 
 * If the argument is <code>true</code>, puts the receiver
 * in a drawing mode where the resulting color in the destination
 * is the <em>exclusive or</em> of the color values in the source
 * and the destination, and if the argument is <code>false</code>,
 * puts the receiver in a drawing mode where the destination color
 * is replaced with the source color value.
 *
 * @param xor if <code>true</code>, then <em>xor</em> mode is used, otherwise <em>source copy</em> mode is used
 *
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public void setXORMode(boolean xor) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (xor) {
		OS.SetROP2(handle, OS.R2_XORPEN);
	} else {
		OS.SetROP2(handle, OS.R2_COPYPEN);
	}
}

/**
 * Returns the extent of the given string. No tab
 * expansion or carriage return processing will be performed.
 * <p>
 * The <em>extent</em> of a string is the width and height of
 * the rectangular area it would cover if drawn in a particular
 * font (in this case, the current font in the receiver).
 * </p>
 *
 * @param string the string to measure
 * @return a point containing the extent of the string
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Point stringExtent(String string) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	SIZE size = new SIZE();
	if (string.length () == 0) {
		OS.GetTextExtentPoint32(handle, SPACE, 1, size);
		return new Point(0, size.cy);
	} else {
		byte [] buffer = Converter.wcsToMbcs(0, string, false);
		OS.GetTextExtentPoint32(handle, buffer, buffer.length, size);
		return new Point(size.cx, size.cy);
	}
}

/**
 * Returns the extent of the given string. Tab expansion and
 * carriage return processing are performed.
 * <p>
 * The <em>extent</em> of a string is the width and height of
 * the rectangular area it would cover if drawn in a particular
 * font (in this case, the current font in the receiver).
 * </p>
 *
 * @param string the string to measure
 * @return a point containing the extent of the string
 *
 * @exception IllegalArgumentException <ul>
 *    <li>ERROR_NULL_ARGUMENT - if the string is null</li>
 * </ul>
 * @exception SWTException <ul>
 *    <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li>
 * </ul>
 */
public Point textExtent(String string) {
	if (handle == 0) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
	if (string == null) SWT.error (SWT.ERROR_NULL_ARGUMENT);
	if (string.length () == 0) {
		SIZE size = new SIZE();
		OS.GetTextExtentPoint32(handle, SPACE, 1, size);
		return new Point(0, size.cy);
	} else {
		RECT rect = new RECT();
		byte [] buffer = Converter.wcsToMbcs(0, string, false);
		OS.DrawText(handle, buffer, buffer.length, rect, OS.DT_EXPANDTABS | OS.DT_LEFT | OS.DT_NOPREFIX | OS.DT_CALCRECT);
		return new Point(rect.right, rect.bottom);
	}
}

/**
 * Returns a string containing a concise, human-readable
 * description of the receiver.
 *
 * @return a string representation of the receiver
 */
public String toString () {
	if (isDisposed()) return "GC {*DISPOSED*}";
	return "GC {" + handle + "}";
}

/**	 
 * Invokes platform specific functionality to allocate a new graphics context.
 * <p>
 * <b>IMPORTANT:</b> This method is <em>not</em> part of the public
 * API for <code>GC</code>. It is marked public only so that it
 * can be shared within the packages provided by SWT. It is not
 * available on all platforms, and should never be called from
 * application code.
 * </p>
 *
 * @param drawable the Drawable for the receiver.
 * @param data the data for the receiver.
 *
 * @return a new <code>GC</code>
 *
 * @private
 */
public static GC win32_new(Drawable drawable, GCData data) {
	GC gc = new GC();
	int hDC = drawable.internal_new_GC(data);
	gc.init(drawable, data, hDC);
	return gc;
}

}