GridWorld扩展任务1图像处理

import imagereader.*; import java.awt.*; import java.awt.image.*; import javax.imageio.*; import java.io.*; public class imageIO implements IImageIO { class BitmapFileHeader{ char[] bfType; int bfSize; int bfReserved; int bfOffBits; public BitmapFileHeader(){ bfType = new char[2]; } } class BitmapInfoHeader{ int biSize; int biWidth; int biHeight; short biPlanes; short biBitCount; int biCompression; int biSizeImage; long biXPelsPerMeter; long biYPelsPerMeter; int biClrUsed; int biClrImportant; } private BitmapFileHeader head; private BitmapInfoHeader inform; private byte[] rgb; private int[] data; public imageIO(){ rgb = null; data = null; } public Image myRead(String filePath){ try{ FileInputStream file = new FileInputStream(filePath); int bfLen = 14; int biLen = 40; byte[] header = new byte[bfLen]; file.read(header, 0, bfLen); byte[] info = new byte[biLen]; file.read(info, 0, biLen); head = getFileHeader(header); inform = getInfoHeader(info); int width = inform.biWidth; int height = inform.biHeight; int size = inform.biSizeImage; int bitCount = inform.biBitCount; int widthBytes = (width * bitCount + 31) / 32 * 4; int npad = widthBytes - 3 * width; data = new int[width*height]; int index = 0; rgb = new byte[size]; file.read(rgb, 0, size); for(int r = 0; r < height; r++){ for(int c = 0; c < width; c++){ data[c + width * (height - r - 1)] = (((int)255 & 0xff) << 24) | (((int)rgb[index + 2] & 0xff) << 16) | (((int)rgb[index + 1] & 0xff) << 8) | ((int)rgb[index] & 0xff); index += 3; } index += npad; } Image image = Toolkit.getDefaultToolkit().createImage( new MemoryImageSource(width, height, data, 0, width)); file.close(); return image; } catch(Exception e){ e.printStackTrace(); System.out.println("Caught exception!"); } return null; } public Image myWrite(Image image,String filePath){ try{ File file; //if the filePath has no a postfix of ".bmp", add a ".bmp" to its tail int pos = filePath.lastIndexOf(".bmp"); if (pos >= 0) file = new File(filePath); else file = new File(filePath + ".bmp"); BufferedImage BImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB); Graphics2D graph = BImage.createGraphics(); graph.drawImage(image, 0, 0, null); graph.dispose(); ImageIO.write(BImage, "bmp", file); return image; } catch (Exception e) { e.printStackTrace(System.out); } return image; } public BitmapFileHeader getFileHeader(byte[] header){ BitmapFileHeader head = new BitmapFileHeader(); head.bfType[0] = (char)header[0]; head.bfType[1] = (char)header[1]; head.bfSize = toInteger(header, 2); head.bfReserved = toInteger(header, 6); head.bfOffBits = toInteger(header, 10); return head; } public BitmapInfoHeader getInfoHeader(byte[] info){ BitmapInfoHeader information = new BitmapInfoHeader(); information.biSize = toInteger(info,0); information.biWidth = toInteger(info,4); information.biHeight = toInteger(info,8); information.biPlanes = 1; information.biBitCount = (short)info[14]; information.biCompression = toInteger(info,16); information.biSizeImage = toInteger(info,20); information.biXPelsPerMeter = toLong(info,24); information.biYPelsPerMeter = toLong(info,28); information.biClrUsed = toInteger(info,32); information.biClrImportant = toInteger(info,36); return information; } public int toInteger(byte[] data,int beg){ int ans; ans = (((int)data[beg+3] & 0xff) << 24) | (((int)data[beg+2] & 0xff) << 16) | (((int)data[beg+1] & 0xff) << 8) | ((int)data[beg] & 0xff); return ans; } public long toLong(byte[] data,int beg){ long ans; ans = (((long)data[beg+3] & 0xff) << 24) | (((long)data[beg+2] & 0xff) << 16) | (((long)data[beg+1] & 0xff) << 8) | ((long)data[beg] & 0xff); return ans; } public BitmapFileHeader getHeader(){ return head; } public BitmapInfoHeader getInfo(){ return inform; } public byte[] getRGB(){ return rgb; } public int[] getData(){ return data; } }