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 private static boolean glyphRenderingTaskIsScheduled = false;
22 public final int pointsize; ///< the size of the font
23 public final JS stream; ///< the stream from which this font was loaded
24 public int max_ascent; ///< the maximum ascent, in pixels
25 public int max_descent; ///< the maximum descent, in pixels
26 boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
27 public Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
29 public abstract static class Glyph {
30 protected Glyph(Font font, char c) { this.font = font; this.c = c; }
31 public final Font font;
33 public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
34 public int advance; ///< amount to increment the x-coordinate
35 public boolean isLoaded = false; ///< true iff the glyph is loaded
36 public int width = -1; ///< the width of the glyph
37 public int height = -1; ///< the height of the glyph
38 public byte[] data = null; ///< the alpha channel samples for this font
39 public String path = null; // FIXME this should be shared across point sizes
41 if (!isLoaded) try { renderGlyph(this); } catch (IOException e) { Log.info(Font.class, e); }
47 // Statics //////////////////////////////////////////////////////////////////////
49 static final Hashtable glyphsToBeCached = new Hashtable();
50 static final Hashtable glyphsToBeDisplayed = new Hashtable();
51 // HACK: replace with Cache<JS, int>
52 private static Basket.Map fonts = new Basket.Hash();
53 public static Font getFont(JS stream, int pointsize) {
54 Basket.Map m = (Basket.Map)fonts.get(stream);
56 if (m != null) ret = (Font)m.get(new Integer(pointsize));
57 else fonts.put(stream, m = new Basket.Hash());
58 if (ret == null) m.put(new Integer(pointsize), ret = new Font(stream, pointsize));
63 // Methods //////////////////////////////////////////////////////////////////////
66 * Rasterize the glyphs of <code>text</code>.
67 * @returns <code>(width<<32)|height</code>
69 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
70 return rasterizeGlyphs(text, pb, textcolor, x, y, cx1, cy1, cx2, cy2, 0); }
71 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y,
72 int cx1, int cy1, int cx2, int cy2, int bg) {
73 int width = 0, height = 0;
74 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
75 for(int i=48; i<57; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
76 for(int i=32; i<47; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
77 for(int i=57; i<128; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
78 if (!glyphRenderingTaskIsScheduled) {
79 Platform.Scheduler.add(glyphRenderingTask);
80 glyphRenderingTaskIsScheduled = true;
82 latinCharsPreloaded = true;
84 for(int i=0; i<text.length(); i++) {
85 final char c = text.charAt(i);
87 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
89 if (pb != null) pb.drawGlyph(g,
91 y + g.font.max_ascent - g.baseline,
98 height = java.lang.Math.max(height, max_ascent + max_descent);
100 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
103 // FEATURE do we really need to be caching sizes?
104 private static Cache sizeCache = new Cache(1000, true);
105 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
106 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
107 public long textsize(String s) {
108 Long l = (Long)sizeCache.get(s);
109 if (l != null) return ((Long)l).longValue();
110 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
111 sizeCache.put(s, new Long(ret));
115 public Glyph getGlyph(char c) {
116 rasterizeGlyphs(c+"", null, 0, 0, 0, 0, 0, 0, 0);
122 static final Callable glyphRenderingTask = new Callable() { public Object run(Object o) {
123 // FIXME: this should be a low-priority task
124 glyphRenderingTaskIsScheduled = false;
125 if (glyphsToBeCached.isEmpty()) return null;
126 Glyph g = (Glyph)glyphsToBeCached.keys().nextElement();
127 if (g == null) return null;
128 glyphsToBeCached.remove(g);
129 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
131 Log.debug(Glyph.class, " done rendering glyph " + g.c);
132 glyphRenderingTaskIsScheduled = true;
133 Platform.Scheduler.add(this);
138 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
140 // FEATURE: use streams, not memoryfont's
141 // FEATURE: kerning pairs
142 private static final Runtime rt;
143 private static JS loadedStream;
144 private static int loadedStreamAddr;
148 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
149 } catch(Exception e) {
150 throw new Error("Error instantiating freetype: " + e);
152 rt.start(new String[]{"freetype"});
157 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
159 private static void loadFontByteStream(JS res) {
160 if(loadedStream == res) return;
163 Log.info(Font.class, "loading font " + JSU.str(res));
164 InputStream is = JSU.getInputStream(res);
165 byte[] fontstream = InputStreamToByteArray.convert(is);
166 rt.free(loadedStreamAddr);
167 loadedStreamAddr = rt.xmalloc(fontstream.length);
168 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
169 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
170 throw new RuntimeException("load_font failed"); // FEATURE: better error
173 } catch (Exception e) {
174 // FEATURE: Better error reporting (thow an exception?)
175 Log.info(Font.class, e);
179 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
181 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
182 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
184 long start = System.currentTimeMillis();
186 rt.call("render",glyph.c,glyph.font.pointsize);
189 glyph.font.max_ascent = rt.getUserInfo(3);
190 glyph.font.max_descent = rt.getUserInfo(4);
191 glyph.baseline = rt.getUserInfo(5);
192 glyph.advance = rt.getUserInfo(6);
194 glyph.width = rt.getUserInfo(1);
195 glyph.height = rt.getUserInfo(2);
197 glyph.data = new byte[glyph.width * glyph.height];
198 int addr = rt.getUserInfo(0);
199 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
201 byte[] path = new byte[rt.getUserInfo(8)];
202 rt.copyin(rt.getUserInfo(7), path, rt.getUserInfo(8));
203 glyph.path = new String(path);
204 glyph.path += " m " + (64 * glyph.advance) + " 0 ";
206 glyph.isLoaded = true;
207 } catch (Exception e) {
208 // FEATURE: Better error reporting (thow an exception?)
209 Log.info(Font.class, e);