import org.xwt.translators.*;
import org.xwt.util.*;
import org.xwt.js.*;
+import java.util.*;
public class Glyph {
public char c;
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;
}
}