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 import java.util.*;
   7
   8 // FEATURE: use streams, not memoryfont's
   9 // FEATURE: kerning pairs
  10 public class Freetype {
  11
  12     public Freetype() { }
  13
  14     private static byte[] image = null;
  15     private static final int FONT_RESERVED = 256*1024;
  16
  17     private org.xwt.mips.Interpreter vm = null;
  18
  19     private Res loadedStream = null;
  20
  21     public void loadFontByteStream(Res res) {
  22         try {
  23             Log.log(this, "loading font " + res.getDescriptiveName());
  24             loadedStream = res;
  25             InputStream is = res.getInputStream();
  26             byte[] fontstream = InputStreamToByteArray.convert(is);
  27             if (image == null) image = InputStreamToByteArray.convert(Main.builtin.getInputStream("freetype.mips"));
  28             vm = new org.xwt.mips.Interpreter(image);
  29             int baseAddr = vm.sbrk(FONT_RESERVED);
  30             vm.copyout(fontstream, baseAddr, fontstream.length);
  31             vm.setUserInfo(0, baseAddr);
  32             vm.setUserInfo(1, fontstream.length);
  33             vm.start(new String[]{ "freetype.mips" });
  34             vm.execute();
  35         } catch (Exception e) {
  36             Log.log(this, e);
  37         }
  38     }
  39
  40     public synchronized void renderGlyph(Res res, Glyph glyph) {
  41         try {
  42             if (loadedStream != res) loadFontByteStream(res);
  43             vm.setUserInfo(2, (int)glyph.c);
  44             vm.setUserInfo(3, (int)glyph.c);
  45             vm.setUserInfo(4, glyph.pointsize);
  46             long start = System.currentTimeMillis();
  47             vm.execute();
  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
  53             int width = vm.getUserInfo(6);
  54             int height = vm.getUserInfo(7);
  55             if (width == 0 || height == 0) {
  56                 Log.log(Freetype.class, "warning glyph has zero width/height");
  57
  58             } else {
  59                 byte[] data = new byte[width * height];
  60                 int addr = vm.getUserInfo(5);
  61                 vm.copyin(addr,data,width*height);
  62                 glyph.p = Platform.createAlphaOnlyPicture(data, width, height);
  63             }
  64         } catch (Exception e) {
  65             Log.log(this, e);
  66         }
  67     }
  68 }