PNG Encoder
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* Contributor(s): Alexandre Iline.
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* The Original Software is the Jemmy library.
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import java.awt.AWTException;
import java.awt.Component;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.FileOutputStream;
import java.io.OutputStream;
import java.util.zip.CRC32;
import java.util.zip.Deflater;
import java.util.zip.DeflaterOutputStream;
import java.util.zip.Inflater;
/** This class allows to encode BufferedImage into B/W, greyscale or true color PNG
* image format with maximum compression.<br>
* It also provides complete functionality for capturing full screen, part of
* screen or single component, encoding and saving captured image info PNG file.
* @author Adam Sotona
* @version 1.0 */
public class PNGEncoder extends Object {
/** black and white image mode. */
public static final byte BW_MODE = 0;
/** grey scale image mode. */
public static final byte GREYSCALE_MODE = 1;
/** full color image mode. */
public static final byte COLOR_MODE = 2;
OutputStream out;
CRC32 crc;
byte mode;
/** public constructor of PNGEncoder class with greyscale mode by default.
* @param out output stream for PNG image format to write into
*/
public PNGEncoder(OutputStream out) {
this(out, GREYSCALE_MODE);
}
/** public constructor of PNGEncoder class.
* @param out output stream for PNG image format to write into
* @param mode BW_MODE, GREYSCALE_MODE or COLOR_MODE
*/
public PNGEncoder(OutputStream out, byte mode) {
crc=new CRC32();
this.out = out;
if (mode<0 || mode>2)
throw new IllegalArgumentException("Unknown color mode");
this.mode = mode;
}
void write(int i) throws IOException {
byte b[]={(byte)((i>>24)&0xff),(byte)((i>>16)&0xff),(byte)((i>>8)&0xff),(byte)(i&0xff)};
write(b);
}
void write(byte b[]) throws IOException {
out.write(b);
crc.update(b);
}
/** main encoding method (stays blocked till encoding is finished).
* @param image BufferedImage to encode
* @throws IOException IOException
*/
public void encode(BufferedImage image) throws IOException {
int width = image.getWidth(null);
int height = image.getHeight(null);
final byte id[] = {-119, 80, 78, 71, 13, 10, 26, 10, 0, 0, 0, 13};
write(id);
crc.reset();
write("IHDR".getBytes());
write(width);
write(height);
byte head[]=null;
switch (mode) {
case BW_MODE: head=new byte[]{1, 0, 0, 0, 0}; break;
case GREYSCALE_MODE: head=new byte[]{8, 0, 0, 0, 0}; break;
case COLOR_MODE: head=new byte[]{8, 2, 0, 0, 0}; break;
}
write(head);
write((int) crc.getValue());
ByteArrayOutputStream compressed = new ByteArrayOutputStream(65536);
BufferedOutputStream bos = new BufferedOutputStream( new DeflaterOutputStream(compressed, new Deflater(9)));
int pixel;
int color;
int colorset;
switch (mode) {
case BW_MODE:
int rest=width%8;
int bytes=width/8;
for (int y=0;y<height;y++) {
bos.write(0);
for (int x=0;x<bytes;x++) {
colorset=0;
for (int sh=0; sh<8; sh++) {
pixel=image.getRGB(x*8+sh,y);
color=((pixel >> 16) & 0xff);
color+=((pixel >> 8) & 0xff);
color+=(pixel & 0xff);
colorset<<=1;
if (color>=3*128)
colorset|=1;
}
bos.write((byte)colorset);
}
if (rest>0) {
colorset=0;
for (int sh=0; sh<width%8; sh++) {
pixel=image.getRGB(bytes*8+sh,y);
color=((pixel >> 16) & 0xff);
color+=((pixel >> 8) & 0xff);
color+=(pixel & 0xff);
colorset<<=1;
if (color>=3*128)
colorset|=1;
}
colorset<<=8-rest;
bos.write((byte)colorset);
}
}
break;
case GREYSCALE_MODE:
for (int y=0;y<height;y++) {
bos.write(0);
for (int x=0;x<width;x++) {
pixel=image.getRGB(x,y);
color=((pixel >> 16) & 0xff);
color+=((pixel >> 8) & 0xff);
color+=(pixel & 0xff);
bos.write((byte)(color/3));
}
}
break;
case COLOR_MODE:
for (int y=0;y<height;y++) {
bos.write(0);
for (int x=0;x<width;x++) {
pixel=image.getRGB(x,y);
bos.write((byte)((pixel >> 16) & 0xff));
bos.write((byte)((pixel >> 8) & 0xff));
bos.write((byte)(pixel & 0xff));
}
}
break;
}
bos.close();
write(compressed.size());
crc.reset();
write("IDAT".getBytes());
write(compressed.toByteArray());
write((int) crc.getValue());
write(0);
crc.reset();
write("IEND".getBytes());
write((int) crc.getValue());
out.close();
}
/** Static method performing screen capture into PNG image format file with given fileName.
* @param rect Rectangle of screen to be captured
* @param fileName file name for screen capture PNG image file */
public static void captureScreen(Rectangle rect, String fileName) {
captureScreen(rect, fileName, GREYSCALE_MODE);
}
/** Static method performing screen capture into PNG image format file with given fileName.
* @param rect Rectangle of screen to be captured
* @param mode image color mode
* @param fileName file name for screen capture PNG image file */
public static void captureScreen(Rectangle rect, String fileName, byte mode) {
try {
BufferedImage capture=new Robot().createScreenCapture(rect);
BufferedOutputStream file=new BufferedOutputStream(new FileOutputStream(fileName));
PNGEncoder encoder=new PNGEncoder(file, mode);
encoder.encode(capture);
} catch (AWTException awte) {
awte.printStackTrace();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
/** Static method performing one component screen capture into PNG image format file with given fileName.
* @param comp Component to be captured
* @param fileName String image target filename */
public static void captureScreen(Component comp, String fileName) {
captureScreen(comp, fileName, GREYSCALE_MODE);
}
/** Static method performing one component screen capture into PNG image format file with given fileName.
* @param comp Component to be captured
* @param fileName String image target filename
* @param mode image color mode */
public static void captureScreen(Component comp, String fileName, byte mode) {
captureScreen(new Rectangle(comp.getLocationOnScreen(),
comp.getSize()),
fileName, mode);
}
/** Static method performing whole screen capture into PNG image format file with given fileName.
* @param fileName String image target filename */
public static void captureScreen(String fileName) {
captureScreen(fileName, GREYSCALE_MODE);
}
/** Static method performing whole screen capture into PNG image format file with given fileName.
* @param fileName String image target filename
* @param mode image color mode */
public static void captureScreen(String fileName, byte mode) {
captureScreen(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize()), fileName, mode);
}
}
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