vgabitmapgraphics.java

来自「纯java操作系统jnode,安装简单和操作简单的个人使用的Java操作系统」· Java 代码 · 共 147 行

/*
 * $Id: VGABitmapGraphics.java,v 1.3 2003/12/21 07:59:15 epr Exp $
 */
package org.jnode.driver.video.vga;

import java.awt.image.Raster;

import org.jnode.awt.util.BitmapGraphics;

/**
 * @author Ewout Prangsma ([e-mail])
 */
public class VGABitmapGraphics extends BitmapGraphics {

	private final StandardVGAIO vgaIO;

	/**
	 * @param vga
	 * @param vgaIO
	 * @param width
	 * @param height
	 * @param offset
	 * @param bytesPerLine
	 */
	public VGABitmapGraphics(StandardVGA vga, StandardVGAIO vgaIO, int width, int height, int offset, int bytesPerLine) {
		super(vga.getVgaMem(), width, height, offset, bytesPerLine);
		this.vgaIO = vgaIO;
	}

	/**
	 * @see org.jnode.awt.util.BitmapGraphics#doDrawImage(java.awt.image.Raster, int, int, int, int, int, int, int)
	 */
	protected void doDrawImage(Raster src, int srcX, int srcY, int dstX, int dstY, int width, int height, int bgColor) {
		doDrawImage(src, srcX, srcY, dstX, dstY, width, height);
	}

	/**
	 * @see org.jnode.awt.util.BitmapGraphics#doDrawImage(java.awt.image.Raster, int, int, int, int, int, int)
	 */
	protected void doDrawImage(Raster src, int srcX, int srcY, int dstX, int dstY, int width, int height) {
		vgaIO.setGRAF(1, 0);
		vgaIO.setGRAF(8, 0xFF);

		final int pWidth = divroundup(width, 8);
		final byte[] plane0 = new byte[pWidth];
		final byte[] plane1 = new byte[pWidth];
		final byte[] plane2 = new byte[pWidth];
		final byte[] plane3 = new byte[pWidth];
		final byte[] buf = new byte[width];
		for (int row = 0; row < height; row++) {
			final int y = dstY + row;
			src.getDataElements(srcX, srcY + row, width, 1, buf);
			for (int col = 0; col < width; col++) {
				final int bit = 0x80 >> ((dstX + col) & 7);
				final int pixel = buf[col];
				final int i = (col >> 3);
				if ((pixel & 0x01) != 0) {
					plane0[i] |= bit;
				}
				if ((pixel & 0x02) != 0) {
					plane1[i] |= bit;
				}
				if ((pixel & 0x04) != 0) {
					plane2[i] |= bit;
				}
				if ((pixel & 0x08) != 0) {
					plane3[i] |= bit;
				}
			}

			final int dstOfs = y * 80 + (dstX >> 3);

			vgaIO.setSEQ(2, 1); //plane 0
			vgaIO.setGRAF(4, 0);
			mem.setBytes(plane0, 0, dstOfs, pWidth);

			vgaIO.setSEQ(2, 2); //plane 1
			vgaIO.setGRAF(4, 1);
			mem.setBytes(plane1, 0, dstOfs, pWidth);

			vgaIO.setSEQ(2, 4); //plane 2
			vgaIO.setGRAF(4, 2);
			mem.setBytes(plane2, 0, dstOfs, pWidth);

			vgaIO.setSEQ(2, 8); //plane 3
			vgaIO.setGRAF(4, 3);
			mem.setBytes(plane3, 0, dstOfs, pWidth);

			for (int col = 0; col < pWidth; col++) {
				plane0[col] = 0;
				plane1[col] = 0;
				plane2[col] = 0;
				plane3[col] = 0;
			}
		}
		vgaIO.setSEQ(2, 0x0F); //restore
		vgaIO.setGRAF(1, 0x0F);
	}

	/**
	 * @see org.jnode.awt.util.BitmapGraphics#doDrawLine(int, int, int, int, int)
	 */
	protected void doDrawLine(int x, int y, int lineWidth, int color, int mode) {
		final int ofsY = y * 80;
		lineWidth = Math.min(this.width - x, lineWidth);
		while (lineWidth > 0) {
			if (((x & 7) == 0) && (lineWidth >= 8)) {
				final int count = lineWidth >> 3;
				final int bits = count << 3;
				final int offset = ofsY + (x >> 3);
				vgaIO.setGRAF(8, 0xFF);
				mem.orByte(offset, (byte) 0xFF, count);
				lineWidth -= bits;
				x += bits;
			} else {
				final int bit = 0x80 >> (x & 7);
				final int offset = ofsY + (x >> 3);
				vgaIO.setGRAF(8, bit);
				mem.orByte(offset, (byte) 0xFF, 1);
				lineWidth--;
				x++;
			}
		}
	}

	/**
	 * @see org.jnode.awt.util.BitmapGraphics#doDrawPixels(int, int, int, int, int)
	 */
	protected void doDrawPixels(int x, int y, int count, int color, int mode) {
		for (int i = 0; i < count; i++) {
			final int bit = 0x80 >> (x & 7);
			final int offset = y * 80 + (x >> 3);
			vgaIO.setGRAF(8, bit);
			mem.orByte(offset, (byte) 0xFF, 1);
			x++;
		}
	}

	private int divroundup(int num, int div) {
		if (num % div == 0) {
			return num / div;
		} else {
			return (num / div) + 1;
		}
	}
}