package org.csstudio.sds.components.ui.internal.figureparts;

import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.DirectColorModel;
import java.awt.image.IndexColorModel;
import java.awt.image.WritableRaster;

import org.eclipse.swt.graphics.*;

/**
 * A converter between AWT BufferedImage and SWT ImageData. 
 * By taking use of this converter, it is possible to use Java2D in SWT or Draw2D.  
 * @author Xihui Chen
 *
 */
public class AWT2SWTImageConverter {
	
	static BufferedImage convertToAWT(ImageData data) {
		ColorModel colorModel = null;
		PaletteData palette = data.palette;
		if (palette.isDirect) {
			colorModel = new DirectColorModel(data.depth, palette.redMask, palette.greenMask, palette.blueMask);
			BufferedImage bufferedImage = new BufferedImage(colorModel, colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					int pixel = data.getPixel(x, y);
					RGB rgb = palette.getRGB(pixel);
					bufferedImage.setRGB(x, y,  rgb.red << 16 | rgb.green << 8 | rgb.blue);
				}
			}
			return bufferedImage;
		} else {
			RGB[] rgbs = palette.getRGBs();
			byte[] red = new byte[rgbs.length];
			byte[] green = new byte[rgbs.length];
			byte[] blue = new byte[rgbs.length];
			for (int i = 0; i < rgbs.length; i++) {
				RGB rgb = rgbs[i];
				red[i] = (byte)rgb.red;
				green[i] = (byte)rgb.green;
				blue[i] = (byte)rgb.blue;
			}
			if (data.transparentPixel != -1) {
				colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue, data.transparentPixel);
			} else {
				colorModel = new IndexColorModel(data.depth, rgbs.length, red, green, blue);
			}		
			BufferedImage bufferedImage = new BufferedImage(colorModel, colorModel.createCompatibleWritableRaster(data.width, data.height), false, null);
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[1];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					int pixel = data.getPixel(x, y);
					pixelArray[0] = pixel;
					raster.setPixel(x, y, pixelArray);
				}
			}
			return bufferedImage;
		}
	}

	static ImageData convertToSWT(BufferedImage bufferedImage) {
		if (bufferedImage.getColorModel() instanceof DirectColorModel) {
			DirectColorModel colorModel = (DirectColorModel)bufferedImage.getColorModel();
			PaletteData palette = new PaletteData(colorModel.getRedMask(), colorModel.getGreenMask(), colorModel.getBlueMask());
			ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette);
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					int rgb = bufferedImage.getRGB(x, y);
					int pixel = palette.getPixel(new RGB((rgb >> 16) & 0xFF, (rgb >> 8) & 0xFF, rgb & 0xFF)); 
					data.setPixel(x, y, pixel);
				}
			}		
			return data;		
		} else if (bufferedImage.getColorModel() instanceof IndexColorModel) {
			IndexColorModel colorModel = (IndexColorModel)bufferedImage.getColorModel();
			int size = colorModel.getMapSize();
			byte[] reds = new byte[size];
			byte[] greens = new byte[size];
			byte[] blues = new byte[size];
			colorModel.getReds(reds);
			colorModel.getGreens(greens);
			colorModel.getBlues(blues);
			RGB[] rgbs = new RGB[size];
			for (int i = 0; i < rgbs.length; i++) {
				rgbs[i] = new RGB(reds[i] & 0xFF, greens[i] & 0xFF, blues[i] & 0xFF);
			}
			PaletteData palette = new PaletteData(rgbs);
			ImageData data = new ImageData(bufferedImage.getWidth(), bufferedImage.getHeight(), colorModel.getPixelSize(), palette);
			data.transparentPixel = colorModel.getTransparentPixel();
			WritableRaster raster = bufferedImage.getRaster();
			int[] pixelArray = new int[1];
			for (int y = 0; y < data.height; y++) {
				for (int x = 0; x < data.width; x++) {
					raster.getPixel(x, y, pixelArray);
					data.setPixel(x, y, pixelArray[0]);
				}
			}
			return data;
		}
		return null;
	}


}

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