读取bmp图片数据
1 public void getBMPImage(String source) throws Exception {
2
3 clearNData(); //清除數據保存區
4 FileInputStream fs = null;
5
6 try {
7 fs = new FileInputStream(source);
8 int bfLen = 14;
9 byte bf[] = new byte[bfLen];
10 fs.read(bf, 0, bfLen); // 讀取14字節BMP文件頭
11 int biLen = 40;
12 byte bi[] = new byte[biLen];
13 fs.read(bi, 0, biLen); // 讀取40字節BMP信息頭
14 // 源圖寬度
15 nWidth = (((int) bi[7] & 0xff) << 24)
16 | (((int) bi[6] & 0xff) << 16)
17 | (((int) bi[5] & 0xff) << 8) | (int) bi[4] & 0xff;
18 // 源圖高度
19 nHeight = (((int) bi[11] & 0xff) << 24)
20 | (((int) bi[10] & 0xff) << 16)
21 | (((int) bi[9] & 0xff) << 8) | (int) bi[8] & 0xff;
22 // 位數
23 nBitCount = (((int) bi[15] & 0xff) << 8) | (int) bi[14] & 0xff;
24 // 源圖大小
25 int nSizeImage = (((int) bi[23] & 0xff) << 24)
26 | (((int) bi[22] & 0xff) << 16)
27 | (((int) bi[21] & 0xff) << 8) | (int) bi[20] & 0xff;
28 // 對24位BMP進行解析
29 if (nBitCount == 24){
30 int nPad = (nSizeImage / nHeight) - nWidth * 3;
31 nData = new int[nHeight * nWidth];
32 nB=new int[nHeight * nWidth];
33 nR=new int[nHeight * nWidth];
34 nG=new int[nHeight * nWidth];
35 byte bRGB[] = new byte[(nWidth + nPad) * 3 * nHeight];
36 fs.read(bRGB, 0, (nWidth + nPad) * 3 * nHeight);
37 int nIndex = 0;
38 for (int j = 0; j < nHeight; j++){
39 for (int i = 0; i < nWidth; i++) {
40 nData[nWidth * (nHeight - j - 1) + i] = (255 & 0xff) << 24
41 | (((int) bRGB[nIndex + 2] & 0xff) << 16)
42 | (((int) bRGB[nIndex + 1] & 0xff) << 8)
43 | (int) bRGB[nIndex] & 0xff;
44 nB[nWidth * (nHeight - j - 1) + i]=(int) bRGB[nIndex]& 0xff;
45 nG[nWidth * (nHeight - j - 1) + i]=(int) bRGB[nIndex+1]& 0xff;
46 nR[nWidth * (nHeight - j - 1) + i]=(int) bRGB[nIndex+2]& 0xff;
47 nIndex += 3;
48 }
49 nIndex += nPad;
50 }
51 // Toolkit kit = Toolkit.getDefaultToolkit();
52 // image = kit.createImage(new MemoryImageSource(nWidth, nHeight,
53 // nData, 0, nWidth));
54 /*
55 //調試數據的讀取
56 FileWriter fw = new FileWriter("C:\\Documents and Settings\\Administrator\\My Documents\\nDataRaw.txt");//創建新文件
57 PrintWriter out = new PrintWriter(fw);
58 for(int j=0;j<nHeight;j++){
59 for(int i=0;i<nWidth;i++){
60 out.print((65536*256+nData[nWidth * (nHeight - j - 1) + i])+"_"
61 +nR[nWidth * (nHeight - j - 1) + i]+"_"
62 +nG[nWidth * (nHeight - j - 1) + i]+"_"
63 +nB[nWidth * (nHeight - j - 1) + i]+" ");
64
65 }
66 out.println("");
67 }
68 out.close();
69 */
70 }
71 }
72 catch (Exception e) {
73 e.printStackTrace();
74 throw new Exception(e);
75 }
76 finally {
77 if (fs != null) {
78 fs.close();
79 }
80 }
81 // return image;
82 }
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轉載于:https://www.cnblogs.com/zt-zoro/p/4580714.html
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