net.java

来自「维纳滤波」· Java 代码 · 共 201 行

public Image loadbitmap (String sdir, String sfile)
{
	Image image;
	System.out.println("loading:"+sdir+sfile);
	try
	{
		FileInputStream fs=new FileInputStream(sdir+sfile);
		int bflen=14; // 14 字节 BITMAPFILEHEADER
		byte bf[]=new byte[bflen];
		fs.read(bf,0,bflen);
		int bilen=40; // 40 字节 BITMAPINFOHEADER
		byte bi[]=new byte[bilen];
		fs.read(bi,0,bilen);

		// 解释数据。
		int nsize = (((int)bf[5]&0xff)<<24)
		| (((int)bf[4]&0xff)<<16)
		| (((int)bf[3]&0xff)<<8)
		| (int)bf[2]&0xff;
		System.out.println("File type is :"+(char)bf[0]+(char)bf[1]);
		System.out.println("Size of file is :"+nsize);

		int nbisize = (((int)bi[3]&0xff)<<24)
		| (((int)bi[2]&0xff)<<16)
		| (((int)bi[1]&0xff)<<8)
		| (int)bi[0]&0xff;
		System.out.println("Size of bitmapinfoheader is :"+nbisize);

		int nwidth = (((int)bi[7]&0xff)<<24)
		| (((int)bi[6]&0xff)<<16)
		| (((int)bi[5]&0xff)<<8)
		| (int)bi[4]&0xff;
		System.out.println("Width is :"+nwidth);

		int nheight = (((int)bi[11]&0xff)<<24)
		| (((int)bi[10]&0xff)<<16)
		| (((int)bi[9]&0xff)<<8)
		| (int)bi[8]&0xff;
		System.out.println("Height is :"+nheight);

		int nplanes = (((int)bi[13]&0xff)<<8) | (int)bi[12]&0xff;
		System.out.println("Planes is :"+nplanes);

		int nbitcount = (((int)bi[15]&0xff)<<8) | (int)bi[14]&0xff;
		System.out.println("BitCount is :"+nbitcount);

		// 查找表明压缩的非零值
		int ncompression = (((int)bi[19])<<24)
		| (((int)bi[18])<<16)
		| (((int)bi[17])<<8)
		| (int)bi[16];
		System.out.println("Compression is :"+ncompression);

		int nsizeimage = (((int)bi[23]&0xff)<<24)
		| (((int)bi[22]&0xff)<<16)
		| (((int)bi[21]&0xff)<<8)
		| (int)bi[20]&0xff;
		System.out.println("SizeImage is :"+nsizeimage);

int nxpm = (((int)bi[27]&0xff)<<24)
| (((int)bi[26]&0xff)<<16)
| (((int)bi[25]&0xff)<<8)
| (int)bi[24]&0xff;
System.out.println("X-Pixels per meter is :"+nxpm);

int nypm = (((int)bi[31]&0xff)<<24)
| (((int)bi[30]&0xff)<<16)
| (((int)bi[29]&0xff)<<8)
| (int)bi[28]&0xff;
System.out.println("Y-Pixels per meter is :"+nypm);

int nclrused = (((int)bi[35]&0xff)<<24)
| (((int)bi[34]&0xff)<<16)
| (((int)bi[33]&0xff)<<8)
| (int)bi[32]&0xff;
System.out.println("Colors used are :"+nclrused);

int nclrimp = (((int)bi[39]&0xff)<<24)
| (((int)bi[38]&0xff)<<16)
| (((int)bi[37]&0xff)<<8)
| (int)bi[36]&0xff;
System.out.println("Colors important are :"+nclrimp);

if (nbitcount==24)
{
	// 24 位格式不包含调色板数据，但扫描行被补足到
	// 4 个字节。
	int npad = (nsizeimage / nheight) - nwidth * 3;
	int ndata[] = new int [nheight * nwidth];
	byte brgb[] = new byte [( nwidth + npad) * 3 * nheight];
	fs.read (brgb, 0, (nwidth + npad) * 3 * nheight);
	int nindex = 0;
	for (int j = 0; j < nheight; j++)
	{
		for (int i = 0; i < nwidth; i++)
		{
			ndata [nwidth * (nheight - j - 1) + i] =
			(255&0xff)<<24
			| (((int)brgb[nindex+2]&0xff)<<16)
			| (((int)brgb[nindex+1]&0xff)<<8)
			| (int)brgb[nindex]&0xff;
			// System.out.println("Encoded Color at ("
			+i+","+j+")is:"+nrgb+" (R,G,B)= ("
			+((int)(brgb[2]) & 0xff)+","
			+((int)brgb[1]&0xff)+","
			+((int)brgb[0]&0xff)+")");
			nindex += 3;
		}
		nindex += npad;
	}

	image = createImage
		( new MemoryImageSource (nwidth, nheight,
		ndata, 0, nwidth));
}
else if (nbitcount == 8)
{
// 必须确定颜色数。如果 clrsused 参数大于 0，
// 则颜色数由它决定。如果它等于 0，则根据
// bitsperpixel 计算颜色数。
int nNumColors = 0;
if (nclrused > 0)
{
nNumColors = nclrused;
}
else
{
nNumColors = (1&0xff)<<nbitcount;
}
System.out.println("The number of Colors is"+nNumColors);

// 某些位图不计算 sizeimage 域，请找出
// 这些情况并对它们进行修正。
if (nsizeimage == 0)
{
nsizeimage = ((((nwidth*nbitcount)+31) & ~31 ) >> 3);
nsizeimage *= nheight;
System.out.println("nsizeimage (backup) is"+nsizeimage);
}

// 读取调色板颜色。
int npalette[] = new int [nNumColors];
byte bpalette[] = new byte [nNumColors*4];
fs.read (bpalette, 0, nNumColors*4);
int nindex8 = 0;
for (int n = 0; n < nNumColors; n++)
{
npalette[n] = (255&0xff)<<24
| (((int)bpalette[nindex8+2]&0xff)<<16)
| (((int)bpalette[nindex8+1]&0xff)<<8)
| (int)bpalette[nindex8]&0xff;
// System.out.println ("Palette Color "+n
+" is:"+npalette[n]+" (res,R,G,B)= ("
+((int)(bpalette[nindex8+3]) & 0xff)+","
+((int)(bpalette[nindex8+2]) & 0xff)+","
+((int)bpalette[nindex8+1]&0xff)+","
+((int)bpalette[nindex8]&0xff)+")");
nindex8 += 4;
}

// 读取图像数据（实际上是调色板的索引）
// 扫描行仍被补足到 4 个字节。
int npad8 = (nsizeimage / nheight) - nwidth;
System.out.println("nPad is:"+npad8);

int ndata8[] = new int [nwidth*nheight];
byte bdata[] = new byte [(nwidth+npad8)*nheight];
fs.read (bdata, 0, (nwidth+npad8)*nheight);
nindex8 = 0;
for (int j8 = 0; j8 < nheight; j8++)
{
for (int i8 = 0; i8 < nwidth; i8++)
{
ndata8 [nwidth*(nheight-j8-1)+i8] =
npalette [((int)bdata[nindex8]&0xff)];
nindex8++;
}
nindex8 += npad8;
}

image = createImage
( new MemoryImageSource (nwidth, nheight,
ndata8, 0, nwidth));
}
else
{
System.out.println ("Not a 24-bit or 8-bit Windows Bitmap, aborting...");
image = (Image)null;
}

fs.close();
return image;
}
catch (Exception e)
{
System.out.println("Caught exception in loadbitmap!");
}
return (Image) null;
}