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     private static final int FONT_RESERVED = 256*1024;
  17
  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(FONT_RESERVED);
  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         File cacheFile = null;
  46         try {
  47             String key = glyph.font.res.getCacheKey() + ":" + glyph.c;
  48             key = new String(Base64.encode(key.getBytes()));
  49             cacheFile = new java.io.File(System.getProperty("user.home") +
  50                                          java.io.File.separatorChar + ".xwt" +
  51                                          java.io.File.separatorChar + "caches" +
  52                                          java.io.File.separatorChar + "glyphs" +
  53                                          java.io.File.separatorChar +
  54                                          key);
  55             new java.io.File(cacheFile.getParent()).mkdirs();
  56         } catch (Res.NotCacheableException e) {
  57             Log.log(Freetype.class, "note: glyph not cacheable");
  58         }
  59
  60         if (cacheFile != null && cacheFile.exists()) {
  61             DataInputStream dis = new DataInputStream(new FileInputStream(cacheFile));
  62             width = dis.readInt();
  63             height = dis.readInt();
  64             glyph.font.max_ascent = dis.readInt();
  65             glyph.font.max_descent = dis.readInt();
  66             glyph.baseline = dis.readInt();
  67             glyph.advance = dis.readInt();
  68             data = new byte[width * height];
  69             if (width != 0 && height != 0) dis.readFully(data);
  70
  71         } else try {
  72             System.out.println("cache miss!");
  73             if (loadedStream != glyph.font.res) loadFontByteStream(glyph.font.res);
  74             vm.setUserInfo(2, (int)glyph.c);
  75             vm.setUserInfo(3, (int)glyph.c);
  76             vm.setUserInfo(4, glyph.font.pointsize);
  77             long start = System.currentTimeMillis();
  78             vm.execute();
  79             glyph.font.max_ascent = vm.getUserInfo(8);
  80             glyph.font.max_descent = vm.getUserInfo(9);
  81             glyph.baseline = vm.getUserInfo(10);
  82             glyph.advance = vm.getUserInfo(11);
  83
  84             width = vm.getUserInfo(6);
  85             height = vm.getUserInfo(7);
  86
  87             data = new byte[width * height];
  88             int addr = vm.getUserInfo(5);
  89             vm.copyin(addr,data,width*height);
  90             File tmp = new File(cacheFile.getCanonicalPath() + ".tmp");
  91             DataOutputStream dis = new DataOutputStream(new FileOutputStream(tmp));
  92             dis.writeInt(width);
  93             dis.writeInt(height);
  94             dis.writeInt(glyph.font.max_ascent);
  95             dis.writeInt(glyph.font.max_descent);
  96             dis.writeInt(glyph.baseline);
  97             dis.writeInt(glyph.advance);
  98             if (width != 0 && height != 0) dis.write(data, 0, data.length);
  99             dis.close();
 100             tmp.renameTo(cacheFile);
 101
 102         } catch (Exception e) {
 103             Log.log(this, e);
 104         }
 105
 106         if (width == 0 || height == 0) Log.log(Freetype.class, "warning glyph has zero width/height");
 107         glyph.p = Platform.createAlphaOnlyPicture(data, width, height);
 108     }
 109 }