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 long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
67 return rasterizeGlyphs(text, pb, textcolor, x, y, cx1, cy1, cx2, cy2, 0); }
68 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y,
69 int cx1, int cy1, int cx2, int cy2, int bg) {
70 int width = 0, height = 0;
71 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
72 for(int i=48; i<57; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
73 for(int i=32; i<47; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
74 for(int i=57; i<128; i++) if(glyphs[i]==null) toBeRasterized.append(glyphs[i]=Platform.createGlyph(this, (char)i));
75 latinCharsPreloaded = true;
77 for(int i=0; i<text.length(); i++) {
78 final char c = text.charAt(i);
80 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
82 if (pb != null) pb.drawGlyph(g,
84 y + g.font.max_ascent - g.baseline,
91 height = java.lang.Math.max(height, max_ascent + max_descent);
93 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
96 // FEATURE do we really need to be caching sizes?
97 private static Cache sizeCache = new Cache(1000, true);
98 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
99 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
100 public long textsize(String s) {
101 Long l = (Long)sizeCache.get(s);
102 if (l != null) return ((Long)l).longValue();
103 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
104 sizeCache.put(s, new Long(ret));
108 public Glyph getGlyph(char c) {
109 rasterizeGlyphs(c+"", null, 0, 0, 0, 0, 0, 0, 0);
115 static { new Thread() { public void run() {
117 Glyph g = (Glyph)toBeRasterized.remove(true);
118 if (g == null) continue;
119 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
121 Log.debug(Glyph.class, " done rendering glyph " + g.c);
126 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
128 // FEATURE: use streams, not memoryfont's
129 // FEATURE: kerning pairs
130 private static final Runtime rt;
131 private static JS loadedStream;
132 private static int loadedStreamAddr;
136 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
137 } catch(Exception e) {
138 throw new Error("Error instantiating freetype: " + e);
140 rt.start(new String[]{"freetype"});
145 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
147 private static void loadFontByteStream(JS res) {
148 if(loadedStream == res) return;
151 Log.info(Font.class, "loading font " + JSU.str(res));
152 InputStream is = JSU.getInputStream(res);
153 byte[] fontstream = InputStreamToByteArray.convert(is);
154 rt.free(loadedStreamAddr);
155 loadedStreamAddr = rt.xmalloc(fontstream.length);
156 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
157 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
158 throw new RuntimeException("load_font failed"); // FEATURE: better error
161 } catch (Exception e) {
162 // FEATURE: Better error reporting (thow an exception?)
163 Log.info(Font.class, e);
167 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
169 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
170 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
172 long start = System.currentTimeMillis();
174 rt.call("render",glyph.c,glyph.font.pointsize);
177 glyph.font.max_ascent = rt.getUserInfo(3);
178 glyph.font.max_descent = rt.getUserInfo(4);
179 glyph.baseline = rt.getUserInfo(5);
180 glyph.advance = rt.getUserInfo(6);
182 glyph.width = rt.getUserInfo(1);
183 glyph.height = rt.getUserInfo(2);
185 glyph.data = new byte[glyph.width * glyph.height];
186 int addr = rt.getUserInfo(0);
187 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
189 byte[] path = new byte[rt.getUserInfo(8)];
190 rt.copyin(rt.getUserInfo(7), path, rt.getUserInfo(8));
191 glyph.path = new String(path);
192 glyph.path += " m " + (64 * glyph.advance) + " 0 ";
194 glyph.isLoaded = true;
195 } catch (Exception e) {
196 // FEATURE: Better error reporting (thow an exception?)
197 Log.info(Font.class, e);