src/org/xwt/translators/Freetype.java

   1 package org.xwt.translators;
   2 import org.ibex.*;
   3 import org.ibex.util.*;
   4 import java.io.*;
   5
   6 import org.xwt.mips.Runtime;
   7
   8 // FEATURE: use streams, not memoryfont's
   9 // FEATURE: kerning pairs
  10 public class Freetype {
  11
  12     public Freetype() { }
  13
  14     private int mem_allocated = 0;
  15     private Runtime vm = null;
  16
  17     private Stream loadedStream = null;
  18
  19     public void loadFontByteStream(Stream res) {
  20         try {
  21             Log.info(this, "loading font " + res);
  22             loadedStream = res;
  23             InputStream is = Stream.getInputStream(res);
  24             byte[] fontstream = InputStreamToByteArray.convert(is);
  25             vm = (Runtime)Class.forName("org.xwt.translators.MIPSApps").newInstance();
  26             int baseAddr = vm.sbrk(fontstream.length);
  27             vm.copyout(fontstream, baseAddr, fontstream.length);
  28             vm.setUserInfo(0, baseAddr);
  29             vm.setUserInfo(1, fontstream.length);
  30             vm.start(new String[]{ "freetype" });
  31             vm.execute();
  32             if(vm.getState() == Runtime.DONE) throw new Error("Freetype VM exited: " + vm.exitStatus());
  33         } catch (Exception e) {
  34             Log.info(this, e);
  35         }
  36     }
  37
  38     public synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
  39         try {
  40             Log.debug(this, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
  41             if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
  42             vm.setUserInfo(2, (int)glyph.c);
  43             vm.setUserInfo(3, (int)glyph.c);
  44             vm.setUserInfo(4, glyph.font.pointsize);
  45             long start = System.currentTimeMillis();
  46             vm.execute();
  47             glyph.font.max_ascent = vm.getUserInfo(8);
  48             glyph.font.max_descent = vm.getUserInfo(9);
  49             glyph.baseline = vm.getUserInfo(10);
  50             glyph.advance = vm.getUserInfo(11);
  51
  52             glyph.width = vm.getUserInfo(6);
  53             glyph.height = vm.getUserInfo(7);
  54
  55             glyph.data = new byte[glyph.width * glyph.height];
  56             int addr = vm.getUserInfo(5);
  57             vm.copyin(addr, glyph.data, glyph.width * glyph.height);
  58             glyph.isLoaded = true;
  59
  60         } catch (Exception e) {
  61             Log.info(this, e);
  62         }
  63     }
  64 }