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.*;
10 // FEATURE: this could be cleaner
11 /** encapsulates a single font (a set of Glyphs) */
14 private Font(Stream stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
16 private static boolean glyphRenderingTaskIsScheduled = false;
18 public final int pointsize; ///< the size of the font
19 public final Stream stream; ///< the stream from which this font was loaded
20 public int max_ascent; ///< the maximum ascent, in pixels
21 public int max_descent; ///< the maximum descent, in pixels
22 boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
23 Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
25 public abstract static class Glyph {
26 protected Glyph(Font font, char c) { this.font = font; this.c = c; }
27 public final Font font;
29 public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
30 public int advance; ///< amount to increment the x-coordinate
31 public boolean isLoaded = false; ///< true iff the glyph is loaded
32 public int width = -1; ///< the width of the glyph
33 public int height = -1; ///< the height of the glyph
34 public byte[] data = null; ///< the alpha channel samples for this font
36 if (!isLoaded) try { renderGlyph(this); } catch (IOException e) { Log.info(Font.class, e); }
42 // Statics //////////////////////////////////////////////////////////////////////
44 static final Hashtable glyphsToBeCached = new Hashtable();
45 static final Hashtable glyphsToBeDisplayed = new Hashtable();
46 private static Cache fontCache = new Cache(100);
47 public static Font getFont(Stream stream, int pointsize) {
48 Font ret = (Font)fontCache.get(stream, new Integer(pointsize));
49 if (ret == null) fontCache.put(stream, new Integer(pointsize), ret = new Font(stream, pointsize));
54 // Methods //////////////////////////////////////////////////////////////////////
57 * Rasterize the glyphs of <code>text</code>.
58 * @returns <code>(width<<32)|height</code>
60 public long rasterizeGlyphs(String text, PixelBuffer pb, int textcolor, int x, int y, int cx1, int cy1, int cx2, int cy2) {
61 int width = 0, height = 0;
62 if (!latinCharsPreloaded) { // preload the Latin-1 charset with low priority (we'll probably want it)
63 for(int i=48; i<57; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
64 for(int i=32; i<47; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
65 for(int i=57; i<128; i++) if (glyphs[i]==null) glyphsToBeCached.put(glyphs[i]=Platform.createGlyph(this, (char)i),"");
66 if (!glyphRenderingTaskIsScheduled) {
67 Scheduler.add(glyphRenderingTask);
68 glyphRenderingTaskIsScheduled = true;
70 latinCharsPreloaded = true;
72 for(int i=0; i<text.length(); i++) {
73 final char c = text.charAt(i);
75 if (g == null) glyphs[c] = g = Platform.createGlyph(this, c);
77 if (pb != null) pb.drawGlyph(g, x + width, y + g.font.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
79 height = java.lang.Math.max(height, max_ascent + max_descent);
81 return ((((long)width) << 32) | (long)(height & 0xffffffffL));
84 // FEATURE do we really need to be caching sizes?
85 private static Cache sizeCache = new Cache(1000);
86 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
87 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
88 public long textsize(String s) {
89 Long l = (Long)sizeCache.get(s);
90 if (l != null) return ((Long)l).longValue();
91 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0);
92 sizeCache.put(s, new Long(ret));
96 static final Task glyphRenderingTask = new Task() { public void perform() {
97 // FIXME: this should be a low-priority task
98 glyphRenderingTaskIsScheduled = false;
99 if (glyphsToBeCached.isEmpty()) return;
100 Glyph g = (Glyph)glyphsToBeCached.keys().nextElement();
101 if (g == null) return;
102 glyphsToBeCached.remove(g);
103 Log.debug(Font.class, "glyphRenderingTask rendering " + g.c + " of " + g.font);
105 Log.debug(Glyph.class, " done rendering glyph " + g.c);
106 glyphRenderingTaskIsScheduled = true;
111 // FreeType Interface //////////////////////////////////////////////////////////////////////////////
113 // FEATURE: use streams, not memoryfont's
114 // FEATURE: kerning pairs
115 private static int mem_allocated = 0;
116 private static org.xwt.mips.Runtime vm = null;
117 private static Stream loadedStream = null;
119 public static void loadFontByteStream(Stream res) {
121 Log.info(Font.class, "loading font " + res);
123 InputStream is = Stream.getInputStream(res);
124 byte[] fontstream = InputStreamToByteArray.convert(is);
125 vm = (org.xwt.mips.Runtime)Class.forName("org.ibex.util.MIPSApps").newInstance();
126 int baseAddr = vm.sbrk(fontstream.length);
127 vm.copyout(fontstream, baseAddr, fontstream.length);
128 vm.setUserInfo(0, baseAddr);
129 vm.setUserInfo(1, fontstream.length);
130 vm.start(new String[]{ "freetype" });
132 if(vm.getState() == org.xwt.mips.Runtime.DONE) throw new Error("Freetype VM exited: " + vm.exitStatus());
133 } catch (Exception e) {
134 Log.info(Font.class, e);
138 public static synchronized void renderGlyph(Font.Glyph glyph) throws IOException {
140 Log.debug(Font.class, "rasterizing glyph " + glyph.c + " of font " + glyph.font);
141 if (loadedStream != glyph.font.stream) loadFontByteStream(glyph.font.stream);
142 vm.setUserInfo(2, (int)glyph.c);
143 vm.setUserInfo(3, (int)glyph.c);
144 vm.setUserInfo(4, glyph.font.pointsize);
145 long start = System.currentTimeMillis();
147 glyph.font.max_ascent = vm.getUserInfo(8);
148 glyph.font.max_descent = vm.getUserInfo(9);
149 glyph.baseline = vm.getUserInfo(10);
150 glyph.advance = vm.getUserInfo(11);
152 glyph.width = vm.getUserInfo(6);
153 glyph.height = vm.getUserInfo(7);
155 glyph.data = new byte[glyph.width * glyph.height];
156 int addr = vm.getUserInfo(5);
157 vm.copyin(addr, glyph.data, glyph.width * glyph.height);
158 glyph.isLoaded = true;
160 } catch (Exception e) {
161 Log.info(Font.class, e);