1 public class ImageReader {
5 public Image readImage(String file) {
7 FileInputStream fs = new FileInputStream(file);
8 int bflen = 14; // 14 byte BITMAPFILEHEADER
9 byte bf[] = new byte[bflen];
10 // fs.read(bf,0,bflen);
12 int bilen = 40; // 40-byte BITMAPINFOHEADER
13 byte bi[] = new byte[bilen];
14 // fs.read(bi,0,bilen);
18 (((int) bf[5] & 0xff) << 24) | (((int) bf[4] & 0xff) << 16) | (((int) bf[3] & 0xff) << 8)
20 // System.out.println("File type is :" + (char) bf[0] + (char) bf[1]);
21 // System.out.println("Size of file is :" + nsize);
23 (((int) bi[3] & 0xff) << 24) | (((int) bi[2] & 0xff) << 16) | (((int) bi[1] & 0xff) << 8)
25 // System.out.println("Size of bitmapinfoheader is :" + nbisize);
27 (((int) bi[7] & 0xff) << 24) | (((int) bi[6] & 0xff) << 16) | (((int) bi[5] & 0xff) << 8)
29 // System.out.println("Width is :" + nwidth);
31 (((int) bi[11] & 0xff) << 24) | (((int) bi[10] & 0xff) << 16) | (((int) bi[9] & 0xff) << 8)
33 // System.out.println("Height is :" + nheight);
34 int nplanes = (((int) bi[13] & 0xff) << 8) | (int) bi[12] & 0xff;
35 // System.out.println("Planes is :" + nplanes);
36 int nbitcount = (((int) bi[15] & 0xff) << 8) | (int) bi[14] & 0xff;
37 // System.out.println("BitCount is :" + nbitcount);
38 // Look for non-zero values to indicate compression
40 (((int) bi[19]) << 24) | (((int) bi[18]) << 16) | (((int) bi[17]) << 8) | (int) bi[16];
41 // System.out.println("Compression is :" + ncompression);
43 (((int) bi[23] & 0xff) << 24) | (((int) bi[22] & 0xff) << 16)
44 | (((int) bi[21] & 0xff) << 8) | (int) bi[20] & 0xff;
45 // System.out.println("SizeImage is :" + nsizeimage);
48 (((int) bi[27] & 0xff) << 24) | (((int) bi[26] & 0xff) << 16)
49 | (((int) bi[25] & 0xff) << 8) | (int) bi[24] & 0xff;
50 // System.out.println("X-Pixels per meter is :" + nxpm);
52 (((int) bi[31] & 0xff) << 24) | (((int) bi[30] & 0xff) << 16)
53 | (((int) bi[29] & 0xff) << 8) | (int) bi[28] & 0xff;
54 // System.out.println("Y-Pixels per meter is :" + nypm);
56 (((int) bi[35] & 0xff) << 24) | (((int) bi[34] & 0xff) << 16)
57 | (((int) bi[33] & 0xff) << 8) | (int) bi[32] & 0xff;
58 // System.out.println("Colors used are :" + nclrused);
60 (((int) bi[39] & 0xff) << 24) | (((int) bi[38] & 0xff) << 16)
61 | (((int) bi[37] & 0xff) << 8) | (int) bi[36] & 0xff;
62 // System.out.println("Colors important are :" + nclrimp);
64 Image image = new Image(nwidth, nheight);
66 if (nbitcount == 24) {
67 // No Palatte data for 24-bit format but scan lines are
68 // padded out to even 4-byte boundaries.
69 int npad = (nsizeimage / nheight) - nwidth * 3;
70 // ndata = new int[(nheight * nwidth) + 4];
71 byte brgb[] = new byte[(nwidth + npad) * 3 * nheight];
72 // fs.read (brgb, 0, (nwidth + npad) * 3 * nheight);
76 for (int j = 0; j < nheight; j++) {
77 for (int i = 0; i < nwidth; i++) {
78 // ndata[nwidth * (nheight - j - 1) + i] =
79 // (255 & 0xff) << 24 | (((int) brgb[nindex + 2] & 0xff) << 16)
80 // | (((int) brgb[nindex + 1] & 0xff) << 8) | (int) brgb[nindex] &
83 ((3 * ((int) (brgb[nindex + 2]) & 0xff) + 6 * ((int) brgb[nindex + 1] & 0xff) + ((int) brgb[nindex] & 0xff))) / 10;
85 // ndata[nwidth * (nheight - j - 1) + i + 4] = ta;
86 yPos = nheight - j - 1;
87 // System.out.println("yPos=" + yPos + " nheight=" + nheight + " j=" +
89 // System.out.println("Encoded Color at (" + i + "," + yPos + ")is:" +
90 // brgb + " (R,G,B)= ("
91 // + ((int) (brgb[nindex + 2]) & 0xff) + "," + ((int) brgb[nindex + 1]
93 // + ((int) brgb[nindex] & 0xff) + ")" + "cufoff=" + ta);
94 image.setPixel(i, yPos, ((int) brgb[nindex + 2] & 0xff), ((int) brgb[nindex + 1] & 0xff),
95 ((int) brgb[nindex] & 0xff));
100 // image = createImage
101 // ( new MemoryImageSource (nwidth, nheight,
102 // ndata, 0, nwidth));
104 } else if (nbitcount == 8) {
105 // Have to determine the number of colors, the clrsused
106 // parameter is dominant if it is greater than zero. If
107 // zero, calculate colors based on bitsperpixel.
110 nNumColors = nclrused;
112 nNumColors = (1 & 0xff) << nbitcount;
114 System.out.println("The number of Colors is" + nNumColors);
115 // Some bitmaps do not have the sizeimage field calculated
116 // Ferret out these cases and fix 'em.
117 if (nsizeimage == 0) {
118 nsizeimage = ((((nwidth * nbitcount) + 31) & 31) >> 3);
119 nsizeimage *= nheight;
120 System.out.println("nsizeimage (backup) is" + nsizeimage);
122 // Read the palatte colors.
123 int npalette[] = new int[nNumColors];
124 byte bpalette[] = new byte[nNumColors * 4];
125 // fs.read (bpalette, 0, nNumColors*4);
128 for (int n = 0; n < nNumColors; n++) {
130 (255 & 0xff) << 24 | (((int) bpalette[nindex8 + 2] & 0xff) << 16)
131 | (((int) bpalette[nindex8 + 1] & 0xff) << 8) | (int) bpalette[nindex8] & 0xff;
132 // System.out.println ("Palette Color "+n
133 // +" is:"+npalette[n]+" (res,R,G,B)= (" +((int)(bpalette[nindex8+3]) &
134 // 0xff)+"," +((int)(bpalette[nindex8+2]) & 0xff)+","
135 // +((int)bpalette[nindex8+1]&0xff)+","
136 // +((int)bpalette[nindex8]&0xff)+")");
140 // Read the image data (actually indices into the palette)
141 // Scan lines are still padded out to even 4-byte
143 int npad8 = (nsizeimage / nheight) - nwidth;
144 // System.out.println("nPad is:" + npad8);
145 // int ndata8[] = new int[nwidth * nheight];
146 // ndata = new int[(nwidth * nheight) + 4];
147 byte bdata[] = new byte[(nwidth + npad8) * nheight];
148 // fs.read (bdata, 0, (nwidth+npad8)*nheight);
151 for (int j8 = 0; j8 < nheight; j8++) {
152 for (int i8 = 0; i8 < nwidth; i8++) {
153 // ndata[nwidth * (nheight - j8 - 1) + i8 + 4] = npalette[((int)
154 // bdata[nindex8] & 0xff)];
155 image.setPixel(i8, j8, npalette[((int) bdata[nindex8] & 0xff)]);
156 // System.out.println("Encoded Color at (" + i8 + "," + j8 + ")is: "
157 // + ndata[nwidth * (nheight - j8 - 1) + i8 + 4]);
162 // image = createImage ( new MemoryImageSource (nwidth, nheight,
163 // ndata8, 0, nwidth));
165 System.out.println("Not a 24-bit or 8-bit Windows Bitmap, aborting...");
166 // image = (Image)null;
170 // ndata[0] = nheight;
171 // ndata[1] = nwidth;
172 // ndata[2] = nheight * nwidth;