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Data update

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Ingy döt Net 2026-04-30 12:34:36 -04:00
parent 4bb20c9b71
commit cbaf4c4b64
12390 changed files with 318560 additions and 27248 deletions
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76
Task/Bitmap-Read-a-PPM-file/Java/bitmap-read-a-ppm-file.java
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@ -12,32 +12,32 @@ import javax.imageio.ImageIO;
public class ReadPPMFile {
public static void main(String[] aArgs) throws IOException {
public static void main(String[] aArgs) throws IOException {
// Using the file created in the Bitmap task
String filePath = "output.ppm";
reader = new BufferedInputStream( new FileInputStream(filePath) );
final char header1 = (char) reader.read();
String filePath = "output.ppm";
reader = new BufferedInputStream( new FileInputStream(filePath) );
final char header1 = (char) reader.read();
final char header2 = (char) reader.read();
final char header3 = (char) reader.read();
if ( header1 != 'P' || header2 != '6' || header3 != END_OF_LINE) {
reader.close();
throw new IllegalArgumentException("Not a valid P6 PPM file");
reader.close();
throw new IllegalArgumentException("Not a valid P6 PPM file");
}
final int width = processCharacters(SPACE_CHARACTER);
final int height = processCharacters(END_OF_LINE);
final int maxColorValue = processCharacters(END_OF_LINE);
if ( maxColorValue < 0 || maxColorValue > 255 ) {
reader.close();
throw new IllegalArgumentException("Maximum color value is outside the range 0..255");
reader.close();
throw new IllegalArgumentException("Maximum color value is outside the range 0..255");
}
// Remove any comments before reading data
reader.mark(1);
while ( reader.read() == START_OF_COMMENT ) {
while ( reader.read() != END_OF_LINE );
reader.mark(1);
while ( reader.read() != END_OF_LINE );
reader.mark(1);
}
reader.reset();
@ -47,10 +47,10 @@ public class ReadPPMFile {
byte[] buffer = new byte[width * 3];
for ( int y = 0; y < height; y++ ) {
reader.read(buffer, 0, buffer.length);
for ( int x = 0; x < width; x++ ) {
for ( int x = 0; x < width; x++ ) {
Color color = new Color(Byte.toUnsignedInt(buffer[x * 3]),
Byte.toUnsignedInt(buffer[x * 3 + 1]),
Byte.toUnsignedInt(buffer[x * 3 + 2]));
Byte.toUnsignedInt(buffer[x * 3 + 1]),
Byte.toUnsignedInt(buffer[x * 3 + 2]));
bitmap.setPixel(x, y, color);
}
}
@ -60,29 +60,29 @@ public class ReadPPMFile {
// Convert to gray scale and save to a file
bitmap.convertToGrayscale();
File grayFile = new File("outputGray.jpg");
ImageIO.write((RenderedImage) bitmap.getImage(), "jpg", grayFile);
}
private static int processCharacters(char aChar) throws IOException {
StringBuilder characters = new StringBuilder();
char ch;
while ( ( ch = (char) reader.read() ) != aChar ) {
if ( ch == START_OF_COMMENT ) {
while ( reader.read() != END_OF_LINE );
continue;
}
characters.append(ch);
}
return Integer.valueOf(characters.toString());
}
private static BufferedInputStream reader;
private static final char START_OF_COMMENT = '#';
private static final char SPACE_CHARACTER = ' ';
private static final char END_OF_LINE = '\n';
ImageIO.write((RenderedImage) bitmap.getImage(), "jpg", grayFile);
}
}
private static int processCharacters(char aChar) throws IOException {
StringBuilder characters = new StringBuilder();
char ch;
while ( ( ch = (char) reader.read() ) != aChar ) {
if ( ch == START_OF_COMMENT ) {
while ( reader.read() != END_OF_LINE );
continue;
}
characters.append(ch);
}
return Integer.valueOf(characters.toString());
}
private static BufferedInputStream reader;
private static final char START_OF_COMMENT = '#';
private static final char SPACE_CHARACTER = ' ';
private static final char END_OF_LINE = '\n';
}
final class BasicBitmapStorage {
@ -105,12 +105,12 @@ final class BasicBitmapStorage {
}
public Image getImage() {
return image;
return image;
}
public void convertToGrayscale() {
for ( int y = 0; y < image.getHeight(); y++ ) {
for ( int x = 0; x < image.getWidth(); x++ ) {
for ( int x = 0; x < image.getWidth(); x++ ) {
int color = image.getRGB(x, y);
int alpha = ( color >> 24 ) & 255;