sets the resized native font in PGraphicsOpenGL, fix #2109

core/src/processing/opengl/PGL.java

@@ -1900,6 +1900,11 @@ public abstract class PGL {
   }
 
 
+  protected Object getDerivedFont(Object font, float size) {
+    return null;
+  }
+
+
   ///////////////////////////////////////////////////////////
 
   // Tessellator interface

core/src/processing/opengl/PGraphicsOpenGL.java

@@ -23,6 +23,7 @@
 package processing.opengl;
 
 import processing.core.*;
+
 import java.net.URL;
 import java.nio.*;
 import java.util.*;
@@ -3281,6 +3282,18 @@ public class PGraphicsOpenGL extends PGraphics {
   }
 
 
+  @Override
+  public void textSize(float size) {
+    if (textFont == null) defaultFontOrDeath("textSize", size);
+    Object font = textFont.getNative();
+    if (font != null) {
+      Object dfont = pgl.getDerivedFont(font, size);
+      textFont.setNative(dfont);
+    }
+    super.textSize(size);
+  }
+
+
   /**
    * Implementation of actual drawing for a line of text.
    */

core/src/processing/opengl/PJOGL.java

@@ -968,6 +968,12 @@ public class PJOGL extends PGL {
   }
 
 
+  @Override
+  protected Object getDerivedFont(Object font, float size) {
+    return ((Font)font).deriveFont(size);
+  }
+
+
   ///////////////////////////////////////////////////////////
 
   // Tessellator

java/libraries/lwjgl/src/processing/lwjgl/PLWJGL.java

@@ -354,6 +354,12 @@ public class PLWJGL extends PGL {
     FontMetrics metrics = pg.parent.getFontMetrics((Font)font);
     return metrics.charsWidth(buffer, start, length);
   }
+  
+  
+  @Override
+  protected Object getDerivedFont(Object font, float size) {
+    return ((Font)font).deriveFont(size);
+  } 
  
   
   ///////////////////////////////////////////////////////////