src/org/xwt/translators/Freetype.java

   1 package org.xwt.translators;
   2 import org.xwt.*;
   3 import org.xwt.util.*;
   4 import java.io.*;
   5 import java.util.zip.*;
   6
   7 // FEATURE: use streams, not memoryfont's
   8 // FEATURE: kerning pairs
   9 public class Freetype {
  10
  11     Freetype() { }
  12
  13     private static org.xwt.mips.Interpreter vm = null;
  14
  15     public static void renderGlyphs(Res res, int pointsize, int firstGlyph, int lastGlyph, Cache glyphCache) {
  16
  17         try {
  18             InputStream is = res.getInputStream();
  19             byte[] fontstream = InputStreamToByteArray.convert(is);
  20
  21             synchronized(Freetype.class) {
  22                 if (vm == null) {
  23                     InputStream bis = Platform.getBuiltinInputStream();
  24                     ZipInputStream zis = new ZipInputStream(bis);
  25                     for(ZipEntry ze = zis.getNextEntry(); ze != null && !ze.getName().equals("freetype.mips"); ze = zis.getNextEntry()) { }
  26                     byte[] image = InputStreamToByteArray.convert(zis);
  27                     vm = new org.xwt.mips.Interpreter(image);
  28                     vm.start(new String[]{ "freetype.mips" });
  29                     vm.execute();
  30                 }
  31
  32                 int FONT_RESERVED = 256*1024;
  33                 int baseAddr = vm.sbrk(FONT_RESERVED);
  34
  35                 vm.copyout(fontstream, baseAddr, fontstream.length);
  36                 vm.setUserInfo(0, baseAddr);
  37                 vm.setUserInfo(1, fontstream.length);
  38                 vm.setUserInfo(2, firstGlyph);
  39                 vm.setUserInfo(3, lastGlyph);
  40                 vm.setUserInfo(4, pointsize);
  41
  42                 long start = System.currentTimeMillis();
  43
  44                 for(int g = firstGlyph; g <= lastGlyph; g++) {
  45                     vm.execute();
  46
  47                     Glyph glyph = new Glyph();
  48                     glyph.max_ascent = vm.getUserInfo(8);
  49                     glyph.max_descent = vm.getUserInfo(9);
  50                     glyph.baseline = vm.getUserInfo(10);
  51                     glyph.advance = vm.getUserInfo(11);
  52                     glyph.c = (char)g;
  53
  54                     int width = vm.getUserInfo(6);
  55                     int height = vm.getUserInfo(7);
  56
  57                     if (width == 0 || height == 0) {
  58                         Log.log(Freetype.class, "warning glyph " + g + " has zero width/height");
  59
  60                     } else {
  61                         byte[] data = new byte[width * height];
  62                         int addr = vm.getUserInfo(5);
  63                         vm.copyin(addr,data,width*height);
  64                         glyph.p = Platform.createAlphaOnlyPicture(data, width, height);
  65                     }
  66
  67                     glyphCache.put(res, new Integer((g << 16) | pointsize), glyph);
  68                 }
  69             }
  70         } catch (Exception e) {
  71             Log.log(Freetype.class, e);
  72         }
  73     }
  74 }