1 // Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
2 package org.ibex.graphics;
3 import org.ibex.util.*;
5 import java.util.Hashtable;
7 import org.ibex.core.*;
8 import org.ibex.nestedvm.*;
9 import org.ibex.plat.*;
10 import org.ibex.nestedvm.Runtime;
12 // FEATURE: this could be cleaner
13 /** encapsulates a single font (a set of Glyphs) */
16 private Font(JS stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
18 private static boolean glyphRenderingTaskIsScheduled = false;
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 Hashtable glyphsToBeCached = new Hashtable();
48 static final Hashtable glyphsToBeDisplayed = new Hashtable();
49 private static Cache fontCache = new Cache(100);
50 public static Font getFont(JS stream, int pointsize) {
51 Font ret = (Font)fontCache.get(stream, new Integer(pointsize));
52 if (ret == null) fontCache.put(stream, new Integer(pointsize), ret = new Font(stream, pointsize));
57 // Methods //////////////////////////////////////////////////////////////////////
60 * Rasterize the glyphs of <code>text</code>.
61 * @returns <code>(width<<32)|height</code>
63 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
64 int width = 0, height = 0;
65 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
66 for(int i=48; i<57; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
67 for(int i=32; i<47; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
68 for(int i=57; i<128; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
69 if (!glyphRenderingTaskIsScheduled) {
70 Scheduler.add(glyphRenderingTask);
71 glyphRenderingTaskIsScheduled = true;
73 latinCharsPreloaded = true;
75 for(int i=0; i<text.length(); i++) {
76 final char c = text.charAt(i);
78 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
80 if (pb != null) pb.drawGlyph(g, x + width, y + g.font.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
82 height = java.lang.Math.max(height, max_ascent + max_descent);
84 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
87 // FEATURE do we really need to be caching sizes?
88 private static Cache sizeCache = new Cache(1000);
89 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
90 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
91 public long textsize(String s) {
92 Long l = (Long)sizeCache.get(s);
93 if (l != null) return ((Long)l).longValue();
94 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
95 sizeCache.put(s, new Long(ret));
99 static final Task glyphRenderingTask = new Task() { public void perform() {
100 // FIXME: this should be a low-priority task
101 glyphRenderingTaskIsScheduled = false;
102 if (glyphsToBeCached.isEmpty()) return;
103 Glyph g = (Glyph)glyphsToBeCached.keys().nextElement();
104 if (g == null) return;
105 glyphsToBeCached.remove(g);
106 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
108 Log.debug(Glyph.class, " done rendering glyph " + g.c);
109 glyphRenderingTaskIsScheduled = true;
114 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
116 // FEATURE: use streams, not memoryfont's
117 // FEATURE: kerning pairs
118 private static final Runtime rt;
119 private static JS loadedStream;
120 private static int loadedStreamAddr;
124 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
125 } catch(Exception e) {
126 throw new Error("Error instantiating freetype: " + e);
128 rt.start(new String[]{"freetype"});
133 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
135 private static void loadFontByteStream(JS res) {
136 if(loadedStream == res) return;
139 Log.info(Font.class, "loading font " + JS.debugToString(res));
140 InputStream is = res.getInputStream();
141 byte[] fontstream = InputStreamToByteArray.convert(is);
142 rt.free(loadedStreamAddr);
143 loadedStreamAddr = rt.xmalloc(fontstream.length);
144 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
145 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
146 throw new RuntimeException("load_font failed"); // FEATURE: better error
149 } catch (Exception e) {
150 // FEATURE: Better error reporting (thow an exception?)
151 Log.info(Font.class, e);
155 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
157 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
158 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
160 long start = System.currentTimeMillis();
162 rt.call("render",glyph.c,glyph.font.pointsize);
165 glyph.font.max_ascent = rt.getUserInfo(3);
166 glyph.font.max_descent = rt.getUserInfo(4);
167 glyph.baseline = rt.getUserInfo(5);
168 glyph.advance = rt.getUserInfo(6);
170 glyph.width = rt.getUserInfo(1);
171 glyph.height = rt.getUserInfo(2);
173 glyph.data = new byte[glyph.width * glyph.height];
174 int addr = rt.getUserInfo(0);
175 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
177 byte[] path = new byte[rt.getUserInfo(8)];
178 rt.copyin(rt.getUserInfo(7), path, rt.getUserInfo(8));
179 glyph.path = new String(path);
180 glyph.path += " m " + (64 * glyph.advance) + " 0 ";
182 glyph.isLoaded = true;
183 } catch (Exception e) {
184 // FEATURE: Better error reporting (thow an exception?)
185 Log.info(Font.class, e);