--- /dev/null
+// Copyright 2004 Adam Megacz, see the COPYING file for licensing [GPL]
+package org.ibex;
+import org.xwt.translators.*;
+import org.ibex.util.*;
+import java.io.*;
+
+// FEATURE: this could be cleaner
+/** encapsulates a single font (a set of Glyphs) */
+public class Font {
+
+ private Font(Stream stream, int pointsize) { this.stream = stream; this.pointsize = pointsize; }
+
+ private static boolean glyphRenderingTaskIsScheduled = false;
+
+ public final int pointsize; ///< the size of the font
+ public final Stream stream; ///< the stream from which this font was loaded
+ public int max_ascent; ///< the maximum ascent, in pixels
+ public int max_descent; ///< the maximum descent, in pixels
+ boolean latinCharsPreloaded = false; ///< true if a request to preload ASCII 32-127 has begun
+ Glyph[] glyphs = new Glyph[65535]; ///< the glyphs that comprise this font
+
+ public abstract static class Glyph {
+ protected Glyph(Font font, char c) { this.font = font; this.c = c; }
+ public final Font font;
+ public final char c;
+ public int baseline; ///< within the alphamask, this is the y-coordinate of the baseline
+ public int advance; ///< amount to increment the x-coordinate
+ public boolean isLoaded = false; ///< true iff the glyph is loaded
+ public int width = -1; ///< the width of the glyph
+ public int height = -1; ///< the height of the glyph
+ public byte[] data = null; ///< the alpha channel samples for this font
+ }
+
+
+ // Statics //////////////////////////////////////////////////////////////////////
+
+ private static final Freetype freetype = new Freetype();
+ static final Queue glyphsToBeRendered = new Queue(255);
+ private static Cache fontCache = new Cache(100);
+ public static Font getFont(Stream stream, int pointsize) {
+ Font ret = (Font)fontCache.get(stream, new Integer(pointsize));
+ if (ret == null) fontCache.put(stream, new Integer(pointsize), ret = new Font(stream, pointsize));
+ return ret;
+ }
+
+
+ // Methods //////////////////////////////////////////////////////////////////////
+
+ /**
+ * Rasterize the glyphs of <code>text</code>.
+ *
+ * If all the glyphs of <code>text</code> are not yet loaded,
+ * spawn a Task to load them and then invoke callback. If all
+ * the glyphs <i>are</i> loaded, rasterize them to the
+ * PixelBuffer (if non-null).
+ *
+ * @returns <code>(width<<32)|height</code> if all glyphs are loaded; else -1
+ */
+ 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, height = 0;
+ for(int i=0; i<text.length(); i++) {
+ final char c = text.charAt(i);
+ Glyph g = glyphs[c];
+ if (g == null) {
+ g = Platform.createGlyph(this, c);
+ glyphs[c] = g;
+ }
+ if (!g.isLoaded) {
+ //Log.debug(Font.class, "rasterizeGlyphs encountered unrasterized glyph " + g.c + " of font " + this);
+ //System.out.println("rasterizeGlyphs encountered unrasterized glyph " + g.c + " of font " + this);
+ glyphsToBeRendered.prepend(g); // even if it's already in the queue, boost its priority
+ encounteredUnrenderedGlyph = true;
+ } else if (!encounteredUnrenderedGlyph) {
+ if (pb != null) pb.drawGlyph(g, 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);
+ }
+ }
+
+ if (!encounteredUnrenderedGlyph) return ((((long)width) << 32) | (long)(height & 0xffffffffL));
+
+ if (callback != null) Scheduler.add(new Scheduler.Task() {
+ public void perform() throws Exception {
+ // FEATURE this isn't terribly efficient... perhaps the task should go on the last glyph?
+ for(int i=0; i<text.length(); i++) {
+ Glyph g = glyphs[text.charAt(i)];
+ if (g == null || !g.isLoaded) { Scheduler.add(this); return; }
+ }
+ callback.perform();
+ }});
+
+ // preload the Latin-1 charset with low priority (we'll probably want it)
+ if (!latinCharsPreloaded) {
+ for(int i=48; i<57; i++) glyphsToBeRendered.append(glyphs[i] = Platform.createGlyph(this, (char)i));
+ for(int i=32; i<47; i++) glyphsToBeRendered.append(glyphs[i] = Platform.createGlyph(this, (char)i));
+ for(int i=57; i<128; i++) glyphsToBeRendered.append(glyphs[i] = Platform.createGlyph(this, (char)i));
+ latinCharsPreloaded = true;
+ }
+ if (!glyphRenderingTaskIsScheduled) {
+ Scheduler.add(glyphRenderingTask);
+ glyphRenderingTaskIsScheduled = true;
+ }
+ return -1;
+ }
+
+ // FEATURE do we really need to be caching sizes?
+ private static Cache sizeCache = new Cache(1000);
+ public int textwidth(String s) { return (int)((textsize(s) >>> 32) & 0xffffffff); }
+ public int textheight(String s) { return (int)(textsize(s) & 0xffffffffL); }
+ public long textsize(String s) {
+ Long l = (Long)sizeCache.get(s);
+ if (l != null) return ((Long)l).longValue();
+ long ret = rasterizeGlyphs(s, null, 0, 0, 0, 0, 0, 0, 0, null);
+ if (ret != -1) sizeCache.put(s, new Long(ret));
+ return ret == -1 ? 0 : ret;
+ }
+
+ static final Scheduler.Task glyphRenderingTask = new Scheduler.Task() { public void perform() {
+ Glyph g = (Glyph)glyphsToBeRendered.remove(false);
+ if (g == null) { glyphRenderingTaskIsScheduled = false; return; }
+ Log.debug(Font.class, "glyphRenderingTask dequeued glyph " + g.c + " of font " + g.font);
+ if (g.isLoaded) { perform(); /* tailcall to the next glyph */ return; }
+ Log.debug(Glyph.class, "rendering glyph " + g.c);
+ try { freetype.renderGlyph(g); } catch (IOException e) { Log.info(Freetype.class, e); }
+ Scheduler.add(this); // keep ourselves in the queue until there are no glyphs to render
+ glyphRenderingTaskIsScheduled = true;
+ } };
+}
projects / org.ibex.core.git / blobdiff