1 // Copyright 2000-2005 the Contributors, as shown in the revision logs.
2 // Licensed under the GNU General Public License version 2 ("the License").
3 // You may not use this file except in compliance with the License.
5 package org.ibex.graphics;
6 import org.ibex.util.*;
8 import java.util.Hashtable;
10 import org.ibex.nestedvm.*;
11 import org.ibex.plat.*;
12 import org.ibex.nestedvm.Runtime;
14 // FEATURE: this could be cleaner
15 /** encapsulates a single font (a set of Glyphs) */
18 private Font(JS stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
20 public final int pointsize; ///< the size of the font
21 public final JS stream; ///< the stream from which this font was loaded
22 public int max_ascent; ///< the maximum ascent, in pixels
23 public int max_descent; ///< the maximum descent, in pixels
24 boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
25 public Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
27 public abstract static class Glyph {
28 protected Glyph(Font font, char c) { this.font = font; this.c = c; }
29 public final Font font;
31 public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
32 public int advance; ///< amount to increment the x-coordinate
33 public boolean isLoaded = false; ///< true iff the glyph is loaded
34 public int width = -1; ///< the width of the glyph
35 public int height = -1; ///< the height of the glyph
36 public byte[] data = null; ///< the alpha channel samples for this font
37 public String path = null; // FIXME this should be shared across point sizes
39 if (!isLoaded) try { renderGlyph(this); } catch (IOException e) { Log.info(Font.class, e); }
45 // Statics //////////////////////////////////////////////////////////////////////
47 static final Queue toBeRasterized = new Queue(300);
48 static final Queue toBeDisplayed = new Queue(300);
49 private static Basket.Map fonts = new Basket.Hash();
50 public static Font getFont(JS stream, int pointsize) {
51 Basket.Map m = (Basket.Map)fonts.get(stream);
53 if (m != null) ret = (Font)m.get(new Integer(pointsize));
54 else fonts.put(stream, m = new Basket.Hash());
55 if (ret == null) m.put(new Integer(pointsize), ret = new Font(stream, pointsize));
60 // Methods //////////////////////////////////////////////////////////////////////
63 * Rasterize the glyphs of <code>text</code>.
64 * @returns <code>(width<<32)|height</code>
66 public String rasterizeGlyphs(String text) {
67 StringBuffer path = new StringBuffer(text.length() * 50);
68 for(int i=0; i<text.length(); i++) {
69 final char c = text.charAt(i);
71 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
75 return path.toString();
77 public long rasterizeGlyphs(String text, PixelBuffer pb, Affine a, Mesh h, int fg, int bg) {
78 int width = 0, height = 0;
79 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
80 for(int i=48; i<57; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
81 for(int i=32; i<47; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
82 for(int i=57; i<128; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
83 latinCharsPreloaded = true;
85 a = a==null ? null : a.copy();
86 for(int i=0; i<text.length(); i++) {
87 final char c = text.charAt(i);
89 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
91 if (a!=null) a.premultiply(Affine.translate(0, g.font.max_ascent - g.baseline));
92 if (pb != null) pb.drawGlyph(g, a, h, fg, bg);
93 if (a!=null) a.premultiply(Affine.translate(0, -1 * (g.font.max_ascent - g.baseline)));
95 if (a!=null) a.premultiply(Affine.translate(g.advance, 0));
96 height = java.lang.Math.max(height, max_ascent + max_descent);
98 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
101 // FEATURE do we really need to be caching sizes?
102 private static Cache sizeCache = new Cache(1000, true);
103 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
104 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
105 public long textsize(String s) {
106 Long l = (Long)sizeCache.get(s);
107 if (l != null) return ((Long)l).longValue();
108 long ret = rasterizeGlyphs(s, null, null, null, 0, 0);
109 sizeCache.put(s, new Long(ret));
113 public Glyph getGlyph(char c) {
114 rasterizeGlyphs(c+"", null, null, null, 0, 0);
120 static { new Thread() { public void run() {
122 Glyph g = (Glyph)toBeRasterized.remove(true);
123 if (g == null) continue;
124 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
126 Log.debug(Glyph.class, " done rendering glyph " + g.c);
131 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
133 // FEATURE: use streams, not memoryfont's
134 // FEATURE: kerning pairs
135 private static final Runtime rt;
136 private static JS loadedStream;
137 private static int loadedStreamAddr;
141 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
142 } catch(Exception e) {
143 throw new Error("Error instantiating freetype: " + e);
145 rt.start(new String[]{"freetype"});
150 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
152 private static void loadFontByteStream(JS res) {
153 if(loadedStream == res) return;
156 Log.info(Font.class, "loading font " + JSU.str(res));
157 InputStream is = JSU.getInputStream(res);
158 byte[] fontstream = InputStreamToByteArray.convert(is);
159 rt.free(loadedStreamAddr);
160 loadedStreamAddr = rt.xmalloc(fontstream.length);
161 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
162 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
163 throw new RuntimeException("load_font failed"); // FEATURE: better error
166 } catch (Exception e) {
167 // FEATURE: Better error reporting (thow an exception?)
168 Log.info(Font.class, e);
172 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
174 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
175 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
177 long start = System.currentTimeMillis();
179 rt.call("render",glyph.c,glyph.font.pointsize);
182 glyph.font.max_ascent = rt.getUserInfo(3);
183 glyph.font.max_descent = rt.getUserInfo(4);
184 glyph.baseline = rt.getUserInfo(5);
185 glyph.advance = rt.getUserInfo(6);
187 glyph.width = rt.getUserInfo(1);
188 glyph.height = rt.getUserInfo(2);
190 glyph.data = new byte[glyph.width * glyph.height];
191 int addr = rt.getUserInfo(0);
192 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
194 byte[] path = new byte[rt.getUserInfo(8)];
195 rt.copyin(rt.getUserInfo(7), path, rt.getUserInfo(8));
196 glyph.path = new String(path);
197 glyph.path += " m " + (64 * glyph.advance) + " 0 ";
199 glyph.isLoaded = true;
200 } catch (Exception e) {
201 // FEATURE: Better error reporting (thow an exception?)
202 Log.info(Font.class, e);