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;
8 import org.ibex.plat.*;
9 import org.xwt.mips.Runtime;
11 // FEATURE: this could be cleaner
12 /** encapsulates a single font (a set of Glyphs) */
15 private Font(Stream stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
17 private static boolean glyphRenderingTaskIsScheduled = false;
19 public final int pointsize; ///< the size of the font
20 public final Stream stream; ///< the stream from which this font was loaded
21 public int max_ascent; ///< the maximum ascent, in pixels
22 public int max_descent; ///< the maximum descent, in pixels
23 boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
24 Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
26 public abstract static class Glyph {
27 protected Glyph(Font font, char c) { this.font = font; this.c = c; }
28 public final Font font;
30 public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
31 public int advance; ///< amount to increment the x-coordinate
32 public boolean isLoaded = false; ///< true iff the glyph is loaded
33 public int width = -1; ///< the width of the glyph
34 public int height = -1; ///< the height of the glyph
35 public byte[] data = null; ///< the alpha channel samples for this font
37 if (!isLoaded) try { renderGlyph(this); } catch (IOException e) { Log.info(Font.class, e); }
43 // Statics //////////////////////////////////////////////////////////////////////
45 static final Hashtable glyphsToBeCached = new Hashtable();
46 static final Hashtable glyphsToBeDisplayed = new Hashtable();
47 private static Cache fontCache = new Cache(100);
48 public static Font getFont(Stream stream, int pointsize) {
49 Font ret = (Font)fontCache.get(stream, new Integer(pointsize));
50 if (ret == null) fontCache.put(stream, new Integer(pointsize), ret = new Font(stream, pointsize));
55 // Methods //////////////////////////////////////////////////////////////////////
58 * Rasterize the glyphs of <code>text</code>.
59 * @returns <code>(width<<32)|height</code>
61 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
62 int width = 0, height = 0;
63 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
64 for(int i=48; i<57; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
65 for(int i=32; i<47; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
66 for(int i=57; i<128; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
67 if (!glyphRenderingTaskIsScheduled) {
68 Scheduler.add(glyphRenderingTask);
69 glyphRenderingTaskIsScheduled = true;
71 latinCharsPreloaded = true;
73 for(int i=0; i<text.length(); i++) {
74 final char c = text.charAt(i);
76 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
78 if (pb != null) pb.drawGlyph(g, x + width, y + g.font.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
80 height = java.lang.Math.max(height, max_ascent + max_descent);
82 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
85 // FEATURE do we really need to be caching sizes?
86 private static Cache sizeCache = new Cache(1000);
87 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
88 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
89 public long textsize(String s) {
90 Long l = (Long)sizeCache.get(s);
91 if (l != null) return ((Long)l).longValue();
92 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
93 sizeCache.put(s, new Long(ret));
97 static final Task glyphRenderingTask = new Task() { public void perform() {
98 // FIXME: this should be a low-priority task
99 glyphRenderingTaskIsScheduled = false;
100 if (glyphsToBeCached.isEmpty()) return;
101 Glyph g = (Glyph)glyphsToBeCached.keys().nextElement();
102 if (g == null) return;
103 glyphsToBeCached.remove(g);
104 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
106 Log.debug(Glyph.class, " done rendering glyph " + g.c);
107 glyphRenderingTaskIsScheduled = true;
112 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
114 // FEATURE: use streams, not memoryfont's
115 // FEATURE: kerning pairs
116 private static final Runtime rt;
117 private static Stream loadedStream;
118 private static int loadedStreamAddr;
122 rt = (Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
123 } catch(Exception e) {
124 throw new Error("Error instansiating freetype");
126 rt.start(new String[]{"freetype"});
131 private static void rtCheck() { if(rt.getState() != Runtime.PAUSED) throw new Error("Freetype exited " + rt.exitStatus()); }
133 private static void loadFontByteStream(Stream res) {
134 if(loadedStream == res) return;
137 Log.info(Font.class, "loading font " + res);
138 InputStream is = Stream.getInputStream(res);
139 byte[] fontstream = InputStreamToByteArray.convert(is);
140 rt.free(loadedStreamAddr);
141 loadedStreamAddr = rt.xmalloc(fontstream.length);
142 rt.copyout(fontstream, loadedStreamAddr, fontstream.length);
143 if(rt.call("load_font", loadedStreamAddr, fontstream.length) != 0)
144 throw new RuntimeException("load_font failed"); // FEATURE: better error
147 } catch (Exception e) {
148 // FEATURE: Better error reporting (thow an exception?)
149 Log.info(Font.class, e);
153 private static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
155 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
156 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
158 long start = System.currentTimeMillis();
160 rt.call("render",glyph.c,glyph.font.pointsize);
163 glyph.font.max_ascent = rt.getUserInfo(3);
164 glyph.font.max_descent = rt.getUserInfo(4);
165 glyph.baseline = rt.getUserInfo(5);
166 glyph.advance = rt.getUserInfo(6);
168 glyph.width = rt.getUserInfo(1);
169 glyph.height = rt.getUserInfo(2);
171 glyph.data = new byte[glyph.width * glyph.height];
172 int addr = rt.getUserInfo(0);
173 rt.copyin(addr, glyph.data, glyph.width * glyph.height);
175 glyph.isLoaded = true;
176 } catch (Exception e) {
177 // FEATURE: Better error reporting (thow an exception?)
178 Log.info(Font.class, e);