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package org.apache.xml.fop.pdf;
/**
* class representing a PDF stream.
*
* A derivative of the PDF Object, a PDF Stream has not only a dictionary
* but a stream of PDF commands. The stream of commands is where the real
* work is done, the dictionary just provides information like the stream
* length.
*/
public class PDFStream extends PDFObject {
/** the stream of PDF commands */
protected StringBuffer data = new StringBuffer();
/**
* create an empty stream object
*
* @param number the object's number
*/
public PDFStream(int number) {
super(number);
}
/**
* append data to the stream
*
* @param s the string of PDF to add
*/
public void add(String s) {
this.data = this.data.append(s);
}
/**
* append an array of xRGB pixels, ASCII Hex Encoding it first
*
* @param pixels the area of pixels
* @param width the width of the image in pixels
* @param height the height of the image in pixels
*/
public void addImageArray(int[] pixels, int width, int height) {
for (int i = 0; i < height; i++) {
for (int j = 0; j < width; j++) {
int p = pixels[i * width + j];
int r = (p >> 16) & 0xFF;
int g = (p >> 8) & 0xFF;
int b = (p ) & 0xFF;
if (r < 16) {
this.data = this.data.append(0);
}
this.data = this.data.append(Integer.toHexString(r));
if (g < 16) {
this.data = this.data.append(0);
}
this.data = this.data.append(Integer.toHexString(g));
if (b < 16) {
this.data = this.data.append(0);
}
this.data = this.data.append(Integer.toHexString(b));
this.data = this.data.append(" ");
}
}
this.data = this.data.append(">\n");
}
/**
* represent as PDF.
*
* @return the PDF string.
*/
public String toPDF() {
String p = this.number + " " + this.generation
+ " obj\n<< /Length " + (this.data.length()+1)
+ " >>\nstream\n" + this.data + "\nendstream\nendobj\n";
return p;
}
}
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