1 // Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
3 import org.ibex.translators.*;
4 import org.ibex.util.*;
6 import java.util.Hashtable;
8 import org.ibex.js.JSExn;
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
38 // Statics //////////////////////////////////////////////////////////////////////
40 private static final Freetype freetype = new Freetype();
41 static final Hashtable glyphsToBeCached = new Hashtable();
42 static final Hashtable glyphsToBeDisplayed = new Hashtable();
43 private static Cache fontCache = new Cache(100);
44 public static Font getFont(Stream stream, int pointsize) {
45 Font ret = (Font)fontCache.get(stream, new Integer(pointsize));
46 if (ret == null) fontCache.put(stream, new Integer(pointsize), ret = new Font(stream, pointsize));
51 // Methods //////////////////////////////////////////////////////////////////////
54 * Rasterize the glyphs of <code>text</code>.
56 * If all the glyphs of <code>text</code> are not yet loaded,
57 * spawn a Task to load them and then invoke callback. If all
58 * the glyphs <i>are</i> loaded, rasterize them to the
59 * PixelBuffer (if non-null).
61 * @returns <code>(width<<32)|height</code> if all glyphs are loaded; else -1
63 public long rasterizeGlyphs(final String text, PixelBuffer pb, int textcolor,
64 int x, int y, int cx1, int cy1, int cx2, int cy2,
65 final Scheduler.Task callback) {
66 boolean encounteredUnrenderedGlyph = false;
67 int width = 0, height = 0;
69 // preload the Latin-1 charset with low priority (we'll probably want it)
70 if (!latinCharsPreloaded) {
71 for(int i=48; i<57; i++) glyphsToBeCached.put(glyphs[i] = Platform.createGlyph(this, (char)i),"");
72 for(int i=32; i<47; i++) glyphsToBeCached.put(glyphs[i] = Platform.createGlyph(this, (char)i),"");
73 for(int i=57; i<128; i++) glyphsToBeCached.put(glyphs[i] = Platform.createGlyph(this, (char)i),"");
75 latinCharsPreloaded = true;
77 if (!glyphRenderingTaskIsScheduled) {
78 Scheduler.add(glyphRenderingTask);
79 glyphRenderingTaskIsScheduled = true;
82 for(int i=0; i<text.length(); i++) {
83 final char c = text.charAt(i);
86 g = Platform.createGlyph(this, c);
90 if (!glyphsToBeDisplayed.contains(g)) {
91 glyphsToBeDisplayed.put(g, ""); // move glyph to the display hash
92 glyphsToBeCached.remove(g);
93 encounteredUnrenderedGlyph = true;
95 } else if (!encounteredUnrenderedGlyph) {
96 if (pb != null) pb.drawGlyph(g, x + width, y + g.font.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
98 height = java.lang.Math.max(height, max_ascent + max_descent);
102 if (!encounteredUnrenderedGlyph) return ((((long)width) << 32) | (long)(height & 0xffffffffL));
104 if (callback != null) Scheduler.add(new Scheduler.Task() {
105 public void perform() throws IOException, JSExn {
106 // FEATURE this isn't terribly efficient... perhaps the task should go on the last glyph?
107 for(int i=0; i<text.length(); i++) {
108 Glyph g = glyphs[text.charAt(i)];
109 if (g == null || !g.isLoaded) { Scheduler.add(this); return; }
116 // FEATURE do we really need to be caching sizes?
117 private static Cache sizeCache = new Cache(1000);
118 public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
119 public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
120 public long textsize(String s) {
121 Long l = (Long)sizeCache.get(s);
122 if (l != null) return ((Long)l).longValue();
123 long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0, null);
124 if (ret != -1) sizeCache.put(s, new Long(ret));
125 return ret == -1 ? 0 : ret;
128 static final Scheduler.Task glyphRenderingTask = new Scheduler.Task() { public void perform() {
130 if (!glyphsToBeDisplayed.isEmpty()) {
131 g = (Glyph)glyphsToBeDisplayed.keys().nextElement();
132 glyphsToBeDisplayed.remove(g);
133 Log.debug(Font.class, "glyphRenderingTask removed glyph " + g.c + " of font " /*+ g.font*/ + " from glyphsToBeDisplayed");
135 else if (!glyphsToBeCached.isEmpty()) {
136 g = (Glyph)glyphsToBeCached.keys().nextElement();
137 glyphsToBeCached.remove(g);
138 Log.debug(Font.class, "glyphRenderingTask removed glyph " + g.c + " of font " /*+ g.font*/ + " from glyphsToBeCached");
141 Log.debug(Glyph.class, "rendering glyph " + g);
142 try { freetype.renderGlyph(g); } catch (IOException e) { Log.info(Freetype.class, e); }
143 Scheduler.add(this); // keep ourselves in the queue until there are no glyphs to render
144 glyphRenderingTaskIsScheduled = true;
147 glyphRenderingTaskIsScheduled = false;