sketcher2/src/com/jotuntech/sketcher/common/BitmapTile.java

/**
 *
 */
package com.jotuntech.sketcher.common;

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferInt;
import java.io.IOException;
import java.io.Serializable;

/**
 * @author Thor Harald Johansen
 *
 */
public class BitmapTile implements Serializable {
	static final long serialVersionUID = 3265680755614445636L;

	public final static int SIZE = 32;
	public final static int SIZE_2 = 5;
	public final static int SIZE_MASK = 31;

	private BufferedImage image;
	private int[] pixels;
	private byte[] encoded;

	/**
	 * Creates a bitmap tile
	 */
	public BitmapTile() {
		image = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
		pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();
	}

	public BitmapTile(BufferedImage imagex) {
		image = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
		pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();

		image.getGraphics().drawImage(imagex, 0, 0, null);
	}

	public BitmapTile(BitmapTile tile) {
		image = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
		tile.image.copyData(image.getRaster());
		pixels = ((DataBufferInt) image.getRaster().getDataBuffer()).getData();
	}

	/*
	public void blendPixel(int x, int y, int sourceColor, int sourceAlpha65025) {
		// Offset in destination pixel array
		int offset = (y << SIZE_2) + x;

		// Fetch destionation pixel
		int destinationPixel = pixels[offset];

		// Get destination's alpha
		int destinationAlpha = Pixels.getChannel0(destinationPixel);

		// Divide source alpha
		int sourceAlpha = sourceAlpha65025 / 255;

		if(sourceAlpha > 0) {
			if(sourceAlpha == 255) {
				pixels[offset] = Pixels.pack(255, sourceColor);
			} else {
				if(destinationAlpha == 0) {
					int dither = sourceAlpha < 255 && sourceAlpha65025 % 255 > Pixels.random() ? 1 : 0;
					pixels[offset] = Pixels.pack(sourceAlpha + dither, sourceColor);
				} else {
					// Destination alpha result
					int destinationAlphaResult, destinationAlphaResult65025;

					if(destinationAlpha == 255) {
						destinationAlphaResult = 255;
						destinationAlphaResult65025 = 65025;
					} else {
						destinationAlphaResult65025 = Math.min(65205, destinationAlpha * 255 + sourceAlpha65025);
						destinationAlphaResult = destinationAlphaResult65025 / 255;
						destinationAlphaResult += destinationAlphaResult < 255 && destinationAlphaResult65025 % 255 > Pixels.random() ? 1 : 0;
					}

					if(sourceColor == Pixels.stripChannel0(destinationPixel)) {
						pixels[offset] = Pixels.pack(destinationAlphaResult, sourceColor);
					} else {
						// Destination colors
						int destinationRed = Pixels.getChannel1(destinationPixel);
						int destinationGreen = Pixels.getChannel2(destinationPixel);
						int destinationBlue = Pixels.getChannel3(destinationPixel);

						// Source colors
						int sourceRed = Pixels.getChannel1(sourceColor);
						int sourceGreen = Pixels.getChannel2(sourceColor);
						int sourceBlue = Pixels.getChannel3(sourceColor);

						if(destinationAlphaResult == 255) {
							int outputRed = destinationRed + ((sourceRed - destinationRed) * sourceAlpha65025) / 65025;
							int outputGreen = destinationGreen + ((sourceGreen - destinationGreen) * sourceAlpha65025) / 65025;
							int outputBlue = destinationBlue + ((sourceBlue - destinationBlue) * sourceAlpha65025) / 65025;

							// Blend, and store to destination
							pixels[offset] = Pixels.pack(255,
									outputRed,
									outputGreen,
									outputBlue);
						} else {
							// Blend, and store to destination
							pixels[offset] = Pixels.pack(destinationAlphaResult,
									destinationRed + ((sourceRed - destinationRed) * sourceAlpha65025) / destinationAlphaResult65025,
									destinationGreen + ((sourceGreen - destinationGreen) * sourceAlpha65025) / destinationAlphaResult65025,
									destinationBlue + ((sourceBlue - destinationBlue) * sourceAlpha65025) / destinationAlphaResult65025);
						}
					}
				}
			}
		}
	}
	*/

	public void blendPixel(int x, int y, int sourceColor, int sourceAlpha65025, int maxAlpha) {
		// Offset in destination pixel array
		int offset = (y << SIZE_2) + x;

		// Fetch destionation pixel
		int destinationPixel = pixels[offset];

		// Get destination's alpha
		int destinationAlpha = Pixels.getChannel0(destinationPixel);

		// Divide source alpha
		int sourceAlpha = sourceAlpha65025 / 255;

		if(sourceAlpha > 0) {
			if(sourceAlpha == 255) {
				pixels[offset] = Pixels.pack(255, sourceColor);
			} else {
				if(destinationAlpha == 0) {
					int dither = sourceAlpha65025 % 255 > Pixels.random() ? 1 : 0;
					pixels[offset] = Pixels.pack((sourceAlpha & 0xFFFFFFFE) | dither, sourceColor);
				} else {
					// Destination alpha result
					int destinationAlphaResult, destinationAlphaResult65025;

					if(destinationAlpha == 255) {
						destinationAlphaResult = 255;
						destinationAlphaResult65025 = 65025;
					} else {
						// Destination multiplied by inverted source alpha.
						int invSrcAlphaMulDest65025 = (destinationAlpha * (65025 - sourceAlpha65025)) / 255;

						// Set destination alpha result
						destinationAlphaResult65025 = Math.max(destinationAlpha * 255, Math.min(maxAlpha * 255, sourceAlpha65025 + invSrcAlphaMulDest65025));
						destinationAlphaResult = destinationAlphaResult65025 / 255;
						destinationAlphaResult = (destinationAlphaResult & 0xFFFFFFFE) | (destinationAlphaResult65025 % 255 > Pixels.random() ? 1 : 0);
					}

					if(sourceColor == Pixels.stripChannel0(destinationPixel)) {
						if(destinationAlphaResult == 255) {
							pixels[offset] = Pixels.pack(255, sourceColor);
						} else {
							pixels[offset] = Pixels.pack(destinationAlphaResult, sourceColor);
						}
					} else {
						// Destination colors
						int destinationRed = Pixels.getChannel1(destinationPixel);
						int destinationGreen = Pixels.getChannel2(destinationPixel);
						int destinationBlue = Pixels.getChannel3(destinationPixel);

						// Source colors
						int sourceRed = Pixels.getChannel1(sourceColor);
						int sourceGreen = Pixels.getChannel2(sourceColor);
						int sourceBlue = Pixels.getChannel3(sourceColor);

						if(destinationAlphaResult == 255) {
							int outputRed = destinationRed + ((sourceRed - destinationRed) * sourceAlpha65025) / 65025;
							int outputGreen = destinationGreen + ((sourceGreen - destinationGreen) * sourceAlpha65025) / 65025;
							int outputBlue = destinationBlue + ((sourceBlue - destinationBlue) * sourceAlpha65025) / 65025;

							// Blend, and store to destination
							pixels[offset] = Pixels.pack(255,
									outputRed,
									outputGreen,
									outputBlue);
						} else {
							// Blend, and store to destination
							pixels[offset] = Pixels.pack(destinationAlphaResult,
									destinationRed + ((sourceRed - destinationRed) * sourceAlpha65025) / destinationAlphaResult65025,
									destinationGreen + ((sourceGreen - destinationGreen) * sourceAlpha65025) / destinationAlphaResult65025,
									destinationBlue + ((sourceBlue - destinationBlue) * sourceAlpha65025) / destinationAlphaResult65025);
						}
					}
				}
			}
		}
	}

	private void writeObject(java.io.ObjectOutputStream out) throws IOException {
		out.writeObject(pixels);
	}

	private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
		this.image = new BufferedImage(SIZE, SIZE, BufferedImage.TYPE_INT_ARGB);
		this.pixels = ((DataBufferInt)image.getRaster().getDataBuffer()).getData();

		int[] pixels = (int[])in.readObject();
		for(int i = 0; i < pixels.length; i++) {
			this.pixels[i] = pixels[i];
		}
	}

	public void setImage(BufferedImage image) {
		this.image = image;
	}

	public BufferedImage getImage() {
		return image;
	}

	public void setPixels(int[] pixels) {
		this.pixels = pixels;
	}

	public int[] getPixels() {
		return pixels;
	}

	public void setEncoded(byte[] encoded) {
		this.encoded = encoded;
	}

	public byte[] getEncoded() {
		return encoded;
	}
}