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 import org.bouncycastle.util.encoders.Base64;
   8
   9 // FEATURE: use streams, not memoryfont's
  10 // FEATURE: kerning pairs
  11 public class Freetype {
  12
  13     public Freetype() { }
  14
  15     private static byte[] image = null;
  16
  17     private int mem_allocated = 0;
  18     private org.xwt.mips.Interpreter vm = null;
  19
  20     private Res loadedStream = null;
  21
  22     public void loadFontByteStream(Res res) {
  23         try {
  24             Log.log(this, "loading font " + res);
  25             loadedStream = res;
  26             InputStream is = res.getInputStream();
  27             byte[] fontstream = InputStreamToByteArray.convert(is);
  28             if (image == null) image = InputStreamToByteArray.convert(Main.builtin.getInputStream("freetype.mips"));
  29             vm = new org.xwt.mips.Interpreter(image);
  30             int baseAddr = vm.sbrk(fontstream.length);
  31             vm.copyout(fontstream, baseAddr, fontstream.length);
  32             vm.setUserInfo(0, baseAddr);
  33             vm.setUserInfo(1, fontstream.length);
  34             vm.start(new String[]{ "freetype.mips" });
  35             vm.execute();
  36         } catch (Exception e) {
  37             Log.log(this, e);
  38         }
  39     }
  40
  41     public synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
  42         int width = 0;
  43         int height = 0;
  44         byte[] data = null;
  45
  46         try {
  47             if (loadedStream != glyph.font.res) loadFontByteStream(glyph.font.res);
  48             vm.setUserInfo(2, (int)glyph.c);
  49             vm.setUserInfo(3, (int)glyph.c);
  50             vm.setUserInfo(4, glyph.font.pointsize);
  51             long start = System.currentTimeMillis();
  52             vm.execute();
  53             glyph.font.max_ascent = vm.getUserInfo(8);
  54             glyph.font.max_descent = vm.getUserInfo(9);
  55             glyph.baseline = vm.getUserInfo(10);
  56             glyph.advance = vm.getUserInfo(11);
  57
  58             width = vm.getUserInfo(6);
  59             height = vm.getUserInfo(7);
  60
  61             data = new byte[width * height];
  62             int addr = vm.getUserInfo(5);
  63             vm.copyin(addr,data,width*height);
  64
  65             if (width == 0 || height == 0) Log.log(Freetype.class, "warning glyph has zero width/height");
  66             glyph.p = Platform.createAlphaOnlyPicture(data, width, height);
  67         } catch (Exception e) {
  68             Log.log(this, e);
  69         }
  70     }
  71 }