Get the distance field to turn off for emoji!

src/main/java/com/github/tommyettinger/textra/Font.java

@@ -98,7 +98,6 @@
  * @see #markup(String, Layout) The markup() method's documentation covers all the markup tags.
  */
 public class Font implements Disposable {
-
     /**
      * A {@link DistanceFieldType} that should be {@link DistanceFieldType#STANDARD} for most fonts, and can be
      * {@link DistanceFieldType#SDF}, {@link DistanceFieldType#MSDF}, or {@link DistanceFieldType#SDF_OUTLINE} if you
@@ -478,10 +477,24 @@ public enum DistanceFieldType {
      * drawn from a TextureAtlas that the font shares with other images.
      */
     public Array<TextureRegion> parents;
-    protected DistanceFieldType distanceField;
+    protected DistanceFieldType distanceField = DistanceFieldType.STANDARD;
 
+    /**
+     * Effectively used to attach a Float value to each Batch that might be used to draw a Font, where the Float is the
+     * current {@code u_smoothing} uniform value used by that Batch.
+     */
     private static final IdentityHashMap<Batch, Float> smoothingValues = new IdentityHashMap<>(8);
 
+    /**
+     * The last Texture drawn, which may be null if nothing has drawn before. This is used to tell when to enable or
+     * disable distance field shaders because some other Texture is being drawn. It's pretty much a hack.
+     * <br>
+     * It is a bad practice, but this is a static mutable field. This should be OK in this case because this only has
+     * any meaning when the Font is being drawn by OpenGL, which is a single-threaded API. All Font instances share this
+     * because that is necessary to allow switching between fonts to make sense.
+     */
+    private static Texture latestTexture = null;
+
     /**
      * If true, this is a fixed-width (monospace) font; if false, this is probably a variable-width font. This affects
      * some rendering decisions Font makes, such as whether subscript chars should take up half-width (for variable
@@ -4151,6 +4164,20 @@ public float drawGlyph(Batch batch, long glyph, float x, float y, float rotation
         GlyphRegion tr = font.mapping.get(c);
         if (tr == null) return 0f;
 
+
+        if(font.distanceField != DistanceFieldType.STANDARD && latestTexture != (latestTexture = tr.getTexture())) {
+            boolean located = false;
+            for (int p = 0; p < font.parents.size; p++) {
+                if (font.parents.get(p).getTexture() == latestTexture) {
+                    font.enableDistanceFieldShader(batch);
+                    located = true;
+                    break;
+                }
+            }
+            if (!located)
+                font.disableDistanceFieldShader(batch);
+        }
+
         if(squashed) {
             sizingY *= 0.7f;
         }

src/test/java/com/github/tommyettinger/textra/EmojiTypingLabelTest.java

@@ -103,7 +103,7 @@ public TypingLabel createTypingLabel() {
 //        font.addImage("😀", atlas.findRegion("love box")).addImage("💀", atlas.findRegion("hate box"));
 //        font.scale(2, 2);
 //        Font font = KnownFonts.addEmoji(new Font("experimental/GentiumUnItalic-sdf.json", true)).scale(0.5f, 0.5f);
-        Font font = KnownFonts.addEmoji(new Font("fontwriter/Gentium-sdf.json", true)).scale(0.6f, 0.6f);
+        Font font = KnownFonts.addEmoji(new Font("fontwriter/Gentium-msdf.json", true)).scale(0.6f, 0.6f);
 //        Font font = KnownFonts.addEmoji(KnownFonts.getGentiumSDF());
 
 //        Font font = new Font(KnownFonts.getOpenSans().scale(0.5f, 0.5f).setTextureFilter());

src/test/java/com/github/tommyettinger/textra/PreviewGenerator.java

@@ -8,6 +8,7 @@
 import com.badlogic.gdx.graphics.g2d.SpriteBatch;
 import com.badlogic.gdx.graphics.g2d.TextureRegion;
 import com.badlogic.gdx.graphics.glutils.ShaderProgram;
+import com.badlogic.gdx.scenes.scene2d.utils.UIUtils;
 import com.badlogic.gdx.utils.Align;
 import com.badlogic.gdx.utils.ScreenUtils;
 import com.badlogic.gdx.utils.TimeUtils;