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.core.*;
11 import org.ibex.nestedvm.*;
12 import org.ibex.plat.*;
13 import org.ibex.nestedvm.Runtime;
15 // FEATURE: this could be cleaner
16 /** encapsulates a single font (a set of Glyphs) */
19 private Font(JS stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
21 private static boolean glyphRenderingTaskIsScheduled = false;
23 public final int pointsize; ///< the size of the font
24 public final JS stream; ///< the stream from which this font was loaded
25 public int max_ascent; ///< the maximum ascent, in pixels
26 public int max_descent; ///< the maximum descent, in pixels
27 boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
28 public Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
30 public abstract static class Glyph {
31 protected Glyph(Font font, char c) { this.font = font; this.c = c; }
32 public final Font font;
34 public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
35 public int advance; ///< amount to increment the x-coordinate
36 public boolean isLoaded = false; ///< true iff the glyph is loaded
37 public int width = -1; ///< the width of the glyph
38 public int height = -1; ///< the height of the glyph
39 public byte[] data = null; ///< the alpha channel samples for this font
40 public String path = null; // FIXME this should be shared across point sizes
42 if (!isLoaded) try { renderGlyph(this); } catch (IOException e) { Log.info(Font.class, e); }
48 // Statics //////////////////////////////////////////////////////////////////////
50 static final Hashtable glyphsToBeCached = new Hashtable();
51 static final Hashtable glyphsToBeDisplayed = new Hashtable();
52 // HACK: replace with Cache<JS, int>
53 private static Basket.Map fonts = new Basket.HashMap();
54 public static Font getFont(JS stream, int pointsize) {
55 Basket.Map m = (Basket.Map)fonts.get(stream);
57 if (m != null) ret = (Font)m.get(new Integer(pointsize));
58 else fonts.put(stream, m = new Basket.HashMap());
59 if (ret == null) m.put(new Integer(pointsize), ret = new Font(stream, pointsize));
64 // Methods //////////////////////////////////////////////////////////////////////
67 * Rasterize the glyphs of <code>text</code>.
68 * @returns <code>(width<<32)|height</code>
70 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
71 int width = 0, height = 0;
72 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
73 for(int i=48; i<57; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
74 for(int i=32; i<47; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
75 for(int i=57; i<128; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
76 if (!glyphRenderingTaskIsScheduled) {
77 Scheduler.add(glyphRenderingTask);
78 glyphRenderingTaskIsScheduled = true;
80 latinCharsPreloaded = true;
82 for(int i=0; i<text.length(); i++) {
83 final char c = text.charAt(i);
85 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
87 if (pb != null) pb.drawGlyph(g, x + width, y + g.font.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
89 height = java.lang.Math.max(height, max_ascent + max_descent);
91 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
94 // FEATURE do we really need to be caching sizes?
95 private static Cache sizeCache = new Cache(1000, true);
96 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
97 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
98 public long textsize(String s) {
99 Long l = (Long)sizeCache.get(s);
100 if (l != null) return ((Long)l).longValue();
101 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
102 sizeCache.put(s, new Long(ret));
106 static final Callable glyphRenderingTask = new Callable() { public Object run(Object o) {
107 // FIXME: this should be a low-priority task
108 glyphRenderingTaskIsScheduled = false;
109 if (glyphsToBeCached.isEmpty()) return null;
110 Glyph g = (Glyph)glyphsToBeCached.keys().nextElement();
111 if (g == null) return null;
112 glyphsToBeCached.remove(g);
113 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
115 Log.debug(Glyph.class, " done rendering glyph " + g.c);
116 glyphRenderingTaskIsScheduled = true;
122 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
124 // FEATURE: use streams, not memoryfont's
125 // FEATURE: kerning pairs
126 private static final Runtime rt;
127 private static JS loadedStream;
128 private static int loadedStreamAddr;
132 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
133 } catch(Exception e) {
134 throw new Error("Error instantiating freetype: " + e);
136 rt.start(new String[]{"freetype"});
141 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
143 private static void loadFontByteStream(JS res) {
144 if(loadedStream == res) return;
147 Log.info(Font.class, "loading font " + JSU.str(res));
148 InputStream is = res.getInputStream();
149 byte[] fontstream = InputStreamToByteArray.convert(is);
150 rt.free(loadedStreamAddr);
151 loadedStreamAddr = rt.xmalloc(fontstream.length);
152 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
153 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
154 throw new RuntimeException("load_font failed"); // FEATURE: better error
157 } catch (Exception e) {
158 // FEATURE: Better error reporting (thow an exception?)
159 Log.info(Font.class, e);
163 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
165 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
166 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
168 long start = System.currentTimeMillis();
170 rt.call("render",glyph.c,glyph.font.pointsize);
173 glyph.font.max_ascent = rt.getUserInfo(3);
174 glyph.font.max_descent = rt.getUserInfo(4);
175 glyph.baseline = rt.getUserInfo(5);
176 glyph.advance = rt.getUserInfo(6);
178 glyph.width = rt.getUserInfo(1);
179 glyph.height = rt.getUserInfo(2);
181 glyph.data = new byte[glyph.width * glyph.height];
182 int addr = rt.getUserInfo(0);
183 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
185 byte[] path = new byte[rt.getUserInfo(8)];
186 rt.copyin(rt.getUserInfo(7), path, rt.getUserInfo(8));
187 glyph.path = new String(path);
188 glyph.path += " m " + (64 * glyph.advance) + " 0 ";
190 glyph.isLoaded = true;
191 } catch (Exception e) {
192 // FEATURE: Better error reporting (thow an exception?)
193 Log.info(Font.class, e);