+// Copyright 2003 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.xwt;
+import org.xwt.translators.*;
+import org.xwt.util.*;
+import org.xwt.js.*;
+import java.util.*;
+
+public class Font {
+
+ public final int pointsize;
+ public final Res res;
+ public int max_ascent;
+ public int max_descent;
+ public Glyph[] glyphs = new Glyph[65535];
+ boolean used = false;
+
+ private Font(Res res, int pointsize) {
+ this.res = res;
+ this.pointsize = pointsize;
+ }
+
+ private static Cache fontCache = new Cache();
+ public static Font getFont(Res res, int pointsize) {
+ Font ret = (Font)fontCache.get(res, new Integer(pointsize));
+ if (ret == null) fontCache.put(res, new Integer(pointsize), ret = new Font(res, pointsize));
+ return ret;
+ }
+
+ /**
+ * 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 long rasterizeGlyphs(final String text, PixelBuffer pb, int textcolor,
+ int x, int y, int cx1, int cy1, int cx2, int cy2,
+ final Scheduler.Task callback) {
+ boolean encounteredUnrenderedGlyph = false;
+ int width = 0;
+ int height = 0;
+ for(int i=0; i<text.length(); i++) {
+ final char c = text.charAt(i);
+ Glyph g = glyphs[c];
+ if (g == null) glyphsToBeRendered.prepend(g = new Glyph(c));
+ if (g.p == null) {
+ glyphsToBeRendered.prepend(g);
+ Scheduler.add(glyphRenderingTask);
+ encounteredUnrenderedGlyph = true;
+ } else if (!encounteredUnrenderedGlyph) {
+ if (pb != null && g.p != null)
+ pb.drawPictureAlphaOnly(g.p, x + width, y + g.font.max_ascent - g.baseline,
+ cx1, cy1, cx2, cy2, textcolor);
+ width += g.advance;
+ height = java.lang.Math.max(height, max_ascent + max_descent);
+ }
+ }
+
+ // FIXME: be cleaner here
+ if (encounteredUnrenderedGlyph) Scheduler.add(new Scheduler.Task() { public void perform() {
+ for(int i=0; i<text.length(); i++) {
+ Glyph g = glyphs[text.charAt(i)];
+ if (g == null || g.p == null) { Scheduler.add(this); return; }
+ }
+ callback.perform();
+ }});
+
+ if (!used) for(int i=32; i<128; i++) glyphsToBeRendered.append(glyphs[i] = new Glyph((char)i));
+ used = true;
+ return ((long)width << 16) | (long)height;
+ }
+
+
+ public class Glyph {
+ public char c;
+ public int baseline; // within the picture, this is the y-coordinate of the baseline
+ public int advance; // amount to increment the x-coordinate
+ public Picture p;
+ public final Font font;
+ public Glyph(char c) { this.c = c; font = Font.this; }
+ }
+
+ private static final Freetype freetype = new Freetype();
+ static final Queue glyphsToBeRendered = new Queue(255);
+ static final Scheduler.Task glyphRenderingTask = new Scheduler.Task() { public void perform() {
+ Glyph g = (Glyph)glyphsToBeRendered.remove(false);
+ if (g == null || g.p != null) return;
+ Log.log(Glyph.class, "rendering glyph " + g.c);
+ freetype.renderGlyph(g);
+ Scheduler.add(this);
+ } };
+}