package screensaver; import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.*;
import com.sun.image.codec.jpeg.*;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.awt.image.MemoryImageSource;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder; public class ScreenPicSaver
{
MediaTracker tracker = new MediaTracker(new Component()
{}); public ScreenPicSaver()
{} public Image loadbitmap(String sdir, String sfile) //读取8位或24位的位图文件
{
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 = Toolkit.getDefaultToolkit().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 = Toolkit.getDefaultToolkit().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;
} public void waitForImage(Image image)
{
//tracker = new MediaTracker(this);
try
{
tracker.addImage(image, 0); //public void addImage(Image image,int id)
//tracker.waitForAll();
tracker.waitForID(0);
tracker.checkAll(true);
/** while(!tracker.checkID(0))
{
tracker.waitForID(0);
}*/
if (tracker.isErrorAny())
{
// System.out.println(tracker.getErrorsAny().toString());
System.out.println("加载图像出现错误！");
System.exit(0);
} // loadStatus = tracker.statusID( 0, false );
// tracker.removeImage(image, 0);
}
catch (InterruptedException e)
{
e.printStackTrace();
}
} // waitForImage public void checkImage(Image image)
{
waitForImage(image); int imageWidth = image.getWidth(null);
if (imageWidth < 1)
{
throw new IllegalArgumentException("image width " + imageWidth +
" is out of range");
}
int imageHeight = image.getHeight(null);
if (imageHeight < 1)
{
throw new IllegalArgumentException("image height " + imageHeight +
" is out of range");
}
// System.out.println( "Image size=" + imageWidth + "x" + imageHeight );
} // checkImage public void encodeJPEG(OutputStream outputStream, Image outputImage,
float outputQuality) throws java.io.IOException
{
int outputWidth = outputImage.getWidth(null);
if (outputWidth < 1)
{
throw new IllegalArgumentException("output image width " + outputWidth +
" is out of range");
}
int outputHeight = outputImage.getHeight(null);
if (outputHeight < 1)
{
throw new IllegalArgumentException("output image height " + outputHeight +
" is out of range");
} // Get a buffered image from the image.
BufferedImage bi = new BufferedImage(outputWidth, outputHeight,
BufferedImage.TYPE_INT_RGB);
Graphics2D biContext = bi.createGraphics();
biContext.drawImage(outputImage, 0, 0, null);
// Note that additional drawing such as watermarks or logos can be placed here. // com.sun.image.codec.jpeg package is included in sun and ibm sdk 1.3
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(outputStream);
// The default quality is 0.75.
JPEGEncodeParam jep = JPEGCodec.getDefaultJPEGEncodeParam(bi);
jep.setQuality(outputQuality, true);
encoder.encode(bi, jep);
// encoder.encode( bi );
outputStream.flush();
} // encodeImage /** Adjusts the size of the image to the given coordinates.
* If width or height is -1, the image aspect ration is maintained.
* <p>
* Hints are one of SCALE_DEFAULT, SCALE_FAST, SCALE_SMOOTH,
* SCALE_REPLICATE, SCALE_AREA_AVERAGING as defined in java.awt.Image.
*/
public Image setSize(Image image, int width, int height, int hints)
{
return image.getScaledInstance(width, height, hints);
} // setSize public Image setSize(Image image, int width, int height)
{
return setSize(image, width, height, java.awt.Image.SCALE_DEFAULT); //setSize调用的是上一个方法.
} // setSize //Component initialization
public static void main(String[] args)
{
ScreenPicSaver sps = new ScreenPicSaver();
// String sdir = new String("d:\\");
// String sfile = new String("desktop.bmp");
String outputFileName = new String("d:\\desktop.jpg"); //Image inputImage = Toolkit.getDefaultToolkit().getImage(inputFileName);
//Image inputImage = sps.loadbitmap(sdir, sfile);
//===============================================================
BufferedImage bufferedImage = null;
Robot robot;
Image inputImage = null;
try
{
robot = new Robot();
bufferedImage = robot.createScreenCapture(new Rectangle(Toolkit.
getDefaultToolkit().getScreenSize())); //得到桌面图像的bufferedImage对象 }
catch (Exception ex)
{
ex.printStackTrace();
}
int width = bufferedImage.getWidth();
int height = bufferedImage.getHeight();
inputImage = bufferedImage.getScaledInstance(width, height,
BufferedImage.TYPE_INT_RGB); //将bufferedImage对象转化位Image对象 MediaTracker tracker = new MediaTracker(new Component()
{}); int outputWidth = inputImage.getWidth(null); //使得新图像和原图像的宽度一样
float outputQuality = 0.80f;
Image outputImage = sps.setSize(inputImage, outputWidth, -1); //-1表示在宽度确定的情况下，高度在原图像的基础上成比例缩放 try
{
tracker.addImage(inputImage, 0);
//sps.tracker.waitForAll();
tracker.waitForID(0);
tracker.checkAll(true);
}
catch (InterruptedException e)
{
e.printStackTrace();
} int imageWidth = inputImage.getWidth(null);
if (imageWidth < 1)
{
throw new IllegalArgumentException("image width " + imageWidth +
" is out of range");
}
int imageHeight = inputImage.getHeight(null);
if (imageHeight < 1)
{
throw new IllegalArgumentException("image height " + imageHeight +
" is out of range");
}
try
{
FileOutputStream fos = new FileOutputStream(outputFileName);
sps.encodeJPEG(fos, outputImage, outputQuality);
fos.flush();
fos.close();
}
catch (Exception e)
{
e.printStackTrace();
} System.exit(0); } }
