src/org/ibex/graphics/PCX.java

   1 package org.ibex.graphics;
   2 import java.io.*;
   3 import java.util.*;
   4
   5 public class PCX {
   6
   7     public static void main(String[] s) throws Exception {
   8         FileOutputStream fos = new FileOutputStream("out.pcx");
   9         int[] data = new int[104 * 104];
  10         for(int i=0; i<104; i++) data[i*104+i] = 1;
  11         for(int i=0; i<104; i++) data[i*104+(104-i)] = 1;
  12         //for(int i=0; i<104*104; i++) data[i] = i%2==0?1:0;
  13         dump(104, 104, data, new DataOutputStream(fos));
  14     }
  15
  16     public static void writeLittleShort(DataOutputStream out, int i) throws IOException {
  17         short s = (short)i;
  18         out.writeByte(s & 0xff);
  19         out.writeByte((s & 0xff00) << 8);
  20     }
  21
  22     public static void dump(int width, int height, int[] data, DataOutputStream out) throws IOException {
  23         out.writeByte(0x0A);             // PCX ID
  24         out.writeByte(0);                // Version
  25         out.writeByte(1);                // Encoding = RLE
  26         out.writeByte(1);                // 1bpp
  27         writeLittleShort(out, 0);        // XStart
  28         writeLittleShort(out, 0);        // YStart
  29         //writeLittleShort(out, 203);      // HDPI
  30         //writeLittleShort(out, 203);      // VDPI
  31         writeLittleShort(out, width-1);    // XEnd
  32         writeLittleShort(out, height-1);   // YEnd
  33         writeLittleShort(out, width-1);    // XEnd
  34         writeLittleShort(out, height-1);   // YEnd
  35         for(int i=0; i<48; i++)
  36             out.writeByte(0);            // Pallette
  37         out.writeByte(0);                // Reserved
  38         out.writeByte(1);                // NumBitPlanes
  39         writeLittleShort(out, (int)Math.ceil(((float)width)/8));  // bytes per line
  40         writeLittleShort(out, 1); // PalleteType=Mono
  41         writeLittleShort(out, 0); // HorizScreenSize (FIXME: maybe omit?)
  42         writeLittleShort(out, 0); // VertScreenSize (FIXME: maybe omit?)
  43         for(int i=0; i<54; i++)
  44             out.writeByte(0);            // Reserved
  45
  46         byte dat = 0;
  47         int count = 0;
  48         for(int y=0; y<height; y++) {
  49             for(int x=0; x<width; x+=8) {
  50                 int i = y * width + x;
  51                 byte b = 0;
  52                 for(int j=i; j<Math.min(data.length, i+8); j++)
  53                     b |= (data[j]==0?0:1) << (7-(j-i));
  54                 if (dat==b && count < 63) count++;
  55                 else {
  56                     if (count > 0) {
  57                         out.writeByte(count | 0xc0);
  58                         out.writeByte(dat);
  59                     }
  60                     dat = b;
  61                     count = 1;
  62                 }
  63             }
  64             if (count > 0) {
  65                 out.writeByte(count | 0xc0);
  66                 out.writeByte(dat);
  67                 count = 0;
  68                 dat = 0;
  69             }
  70         }
  71         out.flush();
  72         out.close();
  73     }
  74
  75 }