Glyph loading fixes and improvements (for Unicode fonts).

- Glyphs are now loaded for specific fonts as needed, not for all of them at once.  This reduces lag and saves memory.
- Fixed glyphs not being loaded in the downloads menu.
- Moved Utils.loadGlyphs() calls directly above text drawing code (easier to maintain, and fixes a bug with text flickering once).

Also removed MusicController methods 'getTrackName()' and 'getArtistName()' (not needed).

Signed-off-by: Jeffrey Han <itdelatrisu@gmail.com>

src/itdelatrisu/opsu/OsuGroupNode.java

@@ -91,6 +91,10 @@ public class OsuGroupNode {
 		}
 
 		// draw text
+		if (Options.useUnicodeMetadata()) {  // load glyphs
+			Utils.loadGlyphs(Utils.FONT_MEDIUM, osu.titleUnicode, null);
+			Utils.loadGlyphs(Utils.FONT_DEFAULT, null, osu.artistUnicode);
+		}
 		Utils.FONT_MEDIUM.drawString(cx, cy, osu.getTitle(), textColor);
 		Utils.FONT_DEFAULT.drawString(cx, cy + Utils.FONT_MEDIUM.getLineHeight() - 4,
 				String.format("%s // %s", osu.getArtist(), osu.creator), textColor);

src/itdelatrisu/opsu/Utils.java

@@ -42,6 +42,7 @@ import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Date;
+import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Scanner;
@@ -102,8 +103,8 @@ public class Utils {
 		FONT_DEFAULT, FONT_BOLD,
 		FONT_XLARGE, FONT_LARGE, FONT_MEDIUM, FONT_SMALL;
 
-	/** Set of all Unicode strings already loaded. */
-	private static HashSet<String> loadedGlyphs = new HashSet<String>();
+	/** Set of all Unicode strings already loaded per font. */
+	private static HashMap<UnicodeFont, HashSet<String>> loadedGlyphs = new HashMap<UnicodeFont, HashSet<String>>();
 
 	/**
 	 * List of illegal filename characters.
@@ -331,33 +332,34 @@ public class Utils {
 	}
 
 	/**
-	 * Adds and loads glyphs for an OsuFile's Unicode title and artist strings.
-	 * @param osu the OsuFile
+	 * Adds and loads glyphs for a beatmap's Unicode title and artist strings.
+	 * @param font the font to add the glyphs to
+	 * @param title the title string
+	 * @param artist the artist string
 	 */
-	public static void loadGlyphs(OsuFile osu) {
-		if (!Options.useUnicodeMetadata())
-			return;
+	public static void loadGlyphs(UnicodeFont font, String title, String artist) {
+		// get set of added strings
+		HashSet<String> set = loadedGlyphs.get(font);
+		if (set == null) {
+			set = new HashSet<String>();
+			loadedGlyphs.put(font, set);
+		}
 
+		// add glyphs if not in set
 		boolean glyphsAdded = false;
-		if (!osu.titleUnicode.isEmpty() && !loadedGlyphs.contains(osu.titleUnicode)) {
-			Utils.FONT_LARGE.addGlyphs(osu.titleUnicode);
-			Utils.FONT_MEDIUM.addGlyphs(osu.titleUnicode);
-			Utils.FONT_DEFAULT.addGlyphs(osu.titleUnicode);
-			loadedGlyphs.add(osu.titleUnicode);
+		if (title != null && !title.isEmpty() && !set.contains(title)) {
+			font.addGlyphs(title);
+			set.add(title);
 			glyphsAdded = true;
 		}
-		if (!osu.artistUnicode.isEmpty() && !loadedGlyphs.contains(osu.artistUnicode)) {
-			Utils.FONT_LARGE.addGlyphs(osu.artistUnicode);
-			Utils.FONT_MEDIUM.addGlyphs(osu.artistUnicode);
-			Utils.FONT_DEFAULT.addGlyphs(osu.artistUnicode);
-			loadedGlyphs.add(osu.artistUnicode);
+		if (artist != null && !artist.isEmpty() && !set.contains(artist)) {
+			font.addGlyphs(artist);
+			set.add(artist);
 			glyphsAdded = true;
 		}
 		if (glyphsAdded) {
 			try {
-				Utils.FONT_LARGE.loadGlyphs();
-				Utils.FONT_MEDIUM.loadGlyphs();
-				Utils.FONT_DEFAULT.loadGlyphs();
+				font.loadGlyphs();
 			} catch (SlickException e) {
 				Log.warn("Failed to load glyphs.", e);
 			}

src/itdelatrisu/opsu/audio/MusicController.java

@@ -171,24 +171,6 @@ public class MusicController {
 	 */
 	public static OsuFile getOsuFile() { return lastOsu; }
 
-	/**
-	 * Returns the name of the current track.
-	 */
-	public static String getTrackName() {
-		if (!trackExists() || lastOsu == null)
-			return null;
-		return lastOsu.getTitle();
-	}
-
-	/**
-	 * Returns the artist of the current track.
-	 */
-	public static String getArtistName() {
-		if (!trackExists() || lastOsu == null)
-			return null;
-		return lastOsu.getArtist();
-	}
-
 	/**
 	 * Returns true if the current track is playing.
 	 */

src/itdelatrisu/opsu/downloads/DownloadNode.java

@@ -332,6 +332,8 @@ public class DownloadNode {
 		textX += img.getWidth() + buttonWidth * 0.001f;
 
 		// text
+		if (Options.useUnicodeMetadata())  // load glyphs
+			Utils.loadGlyphs(Utils.FONT_BOLD, getTitle(), getArtist());
 		Utils.FONT_BOLD.drawString(
 				textX, y + marginY,
 				String.format("%s - %s%s", getArtist(), getTitle(),

src/itdelatrisu/opsu/states/MainMenu.java

@@ -276,11 +276,10 @@ public class MainMenu extends BasicGameState {
 		if (MusicController.isTrackLoading())
 			g.drawString("Track loading...", marginX, marginY + lineHeight);
 		else if (MusicController.trackExists()) {
+			if (Options.useUnicodeMetadata())  // load glyphs
+				Utils.loadGlyphs(Utils.FONT_MEDIUM, osu.titleUnicode, osu.artistUnicode);
 			g.drawString((MusicController.isPlaying()) ? "Now Playing:" : "Paused:", marginX, marginY + lineHeight);
-			g.drawString(String.format("%s: %s",
-					MusicController.getArtistName(),
-					MusicController.getTrackName()),
-					marginX + 25, marginY + (lineHeight * 2));
+			g.drawString(String.format("%s: %s", osu.getArtist(), osu.getTitle()), marginX + 25, marginY + (lineHeight * 2));
 		}
 		long time = System.currentTimeMillis() - osuStartTime;
 		g.drawString(String.format("opsu! has been running for %d minutes, %d seconds.",

src/itdelatrisu/opsu/states/SongMenu.java

@@ -311,9 +311,6 @@ public class SongMenu extends BasicGameState {
 			ScoreData[] scores = getScoreDataForNode(node, false);
 			node.draw(buttonX - offset, buttonY + (i*buttonOffset) + DIVIDER_LINE_WIDTH / 2,
 			          (scores == null) ? Grade.NULL : scores[0].getGrade(), (node == focusNode));
-
-			// load glyphs
-			Utils.loadGlyphs(node.osuFiles.get(0));
 		}
 		g.clearClip();
 
@@ -329,6 +326,7 @@ public class SongMenu extends BasicGameState {
 
 		// header
 		if (focusNode != null) {
+			// music/loader icon
 			float marginX = width * 0.005f, marginY = height * 0.005f;
 			Image musicNote = GameImage.MENU_MUSICNOTE.getImage();
 			if (MusicController.isTrackLoading())
@@ -337,8 +335,14 @@ public class SongMenu extends BasicGameState {
 				musicNote.draw(marginX, marginY);
 			int iconWidth = musicNote.getWidth();
 
-			if (songInfo == null)
+			// song info text
+			if (songInfo == null) {
 				songInfo = focusNode.getInfo();
+				if (Options.useUnicodeMetadata()) {  // load glyphs
+					OsuFile osu = focusNode.osuFiles.get(0);
+					Utils.loadGlyphs(Utils.FONT_LARGE, osu.titleUnicode, osu.artistUnicode);
+				}
+			}
 			marginX += 5;
 			float headerTextY = marginY;
 			Utils.FONT_LARGE.drawString(marginX + iconWidth * 1.05f, headerTextY, songInfo[0], Color.white);
@@ -1183,7 +1187,6 @@ public class SongMenu extends BasicGameState {
 		focusNode = OsuGroupList.get().getNode(node, osuFileIndex);
 		OsuFile osu = focusNode.osuFiles.get(focusNode.osuFileIndex);
 		MusicController.play(osu, false, preview);
-		Utils.loadGlyphs(osu);
 
 		// load scores
 		scoreMap = ScoreDB.getMapSetScores(osu);