2003/10/31 09:50:08

[org.ibex.core.git] / src / org / xwt / Glyph.java

diff --git a/src/org/xwt/Glyph.java b/src/org/xwt/Glyph.java
index efe2ad0..71cf19e 100644 (file)
--- a/src/org/xwt/Glyph.java
+++ b/src/org/xwt/Glyph.java
@@ -3,6 +3,7 @@ package org.xwt;
 import org.xwt.translators.*;
 import org.xwt.util.*;
 import org.xwt.js.*;
+import java.util.*;
 
 public class Glyph {
     public char c;
@@ -10,27 +11,93 @@ public class Glyph {
     public int max_descent;    // same value for every glyph in font; the max descent of all chars
     public int baseline;       // within the picture, this is the y-coordinate of the baseline
     public int advance;        // amount to increment the x-coordinate
+    public int pointsize;
     public Picture p;
+    public Res res;
+    public boolean rendered = false;
 
     // k1=font.res k2=(c << 16 | pointsize)
     private static Cache glyphCache = new Cache();
 
-    public static Glyph getCachedGlyph(Res res, int pointsize, char c) {
-        return (Glyph)glyphCache.get(res, new Integer((((int)c) << 16) | pointsize));
-    }
-    public static void renderGlyph(Res res, int pointsize, char c) {
-       if (!ThreadMessage.suspendThread())
-           throw new RuntimeException("attempt to perform background-only operation in a foreground thread");
-       synchronized(res) {
-           // FEATURE: be smarter here
-           if ((Glyph)glyphCache.get(res, new Integer((((int)c) << 16) | pointsize)) != null) return;
-           Log.log(Freetype.class, "rendering glyphs for font " + res.getDescriptiveName());
-           if (c >= 32 && c < 127) Freetype.renderGlyphs(res, pointsize, 32, 126, glyphCache);
-           else Freetype.renderGlyphs(res, pointsize, (int)c, (int)c, glyphCache);
-           if ((Glyph)glyphCache.get(res, new Integer((((int)c) << 16) | pointsize)) == null)
-               throw new JS.Exn("error rendering glyph " + c + "; glyph is null");
-           Log.log(Freetype.class, "    done rendering glyphs for font " + res.getDescriptiveName());
-       }
-       ThreadMessage.resumeThread();
+    private static Queue glyphsToBeRendered = new Queue(255);
+    private static Freetype freetype = new Freetype();
+
+    private static Scheduler.Task glyphRenderingTask = new Scheduler.Task() {
+            public Object call(Object arg) {
+                Glyph g = (Glyph)glyphsToBeRendered.remove(false);
+                if (g == null) return null;
+                if (g.p != null) return null;
+                Log.log(Glyph.class, "rendering glyph " + g.c);
+                freetype.renderGlyph(g.res, g);
+                g.rendered = true;
+                Scheduler.add(this);
+                return null;
+            }
+        };
+
+    /**
+
+     *  If the glyphs of <code>text</code> are not yet loaded, spawn a
+     *  Task to load them and invoke callback.
+     *
+
+     *  returns the width (in the high-order int) and height (in the
+     *  low-order int) of the string's rasterization, or -1 if some
+     *  glyphs are not loaded.
+
+     */
+    public static long rasterizeGlyphs(final Res res, final int pointsize, final String text, PixelBuffer pb, int textcolor,
+                                  int x, int y, int cx1, int cy1, int cx2, int cy2, final Callback callback) {
+        boolean ret = true;
+        int width = 0;
+        int height = 0;
+        for(int i=0; i<text.length(); i++) {
+            final char c = text.charAt(i);
+            Glyph g = (Glyph)glyphCache.get(res, new Integer((((int)c) << 16) | pointsize));
+            if (g == null) {
+                g = new Glyph();
+                g.c = c;
+                g.pointsize = pointsize;
+                g.res = res; 
+                glyphCache.put(res, new Integer((((int)c) << 16) | pointsize), g);
+                glyphsToBeRendered.prepend(g);
+            }
+            if (g.rendered && ret) {
+                if (pb != null && g.p != null)
+                    pb.drawPictureAlphaOnly(g.p, x, y + g.max_ascent - g.baseline, cx1, cy1, cx2, cy2, textcolor);
+                x += g.advance;
+                width += g.advance;
+                height = java.lang.Math.max(height, g.max_ascent + g.max_descent);
+            } else {
+                glyphsToBeRendered.prepend(g);
+                Scheduler.add(glyphRenderingTask);
+                ret = false;
+            }
+        }
+        if (!ret) Scheduler.add(new Scheduler.Task() { public Object call(Object arg) {
+            for(int i=0; i<text.length(); i++) {
+                Glyph g = (Glyph)glyphCache.get(res, new Integer((((int)text.charAt(i)) << 16) | pointsize));
+                if (g == null || !g.rendered) {
+                    Scheduler.add(this);
+                    return null;
+                }
+            }
+            callback.call(null);
+            return null;
+        }});
+
+        if (ret) return ((long)width << 16) | (long)height;
+        for(int i=32; i<128; i++) {
+            Glyph g = (Glyph)glyphCache.get(res, new Integer((i << 16) | pointsize));
+            if (g == null) {
+                g = new Glyph();
+                g.c = (char)i;
+                g.pointsize = pointsize;
+                g.res = res;
+                glyphCache.put(res, new Integer((i << 16) | pointsize), g);
+                glyphsToBeRendered.append(g);
+            }
+        }
+        return -1;
     }
 }