use non-bold font on splash screen (IDEA-163681)

platform/platform-impl/src/com/intellij/ide/ui/laf/darcula/DarculaLaf.java

@@ -54,8 +54,6 @@ import java.net.URL;
 import java.util.*;
 import java.util.List;
 
-import static java.util.Locale.ENGLISH;
-
 /**
  * @author Konstantin Bulenkov
  */
@@ -105,7 +103,7 @@ public class DarculaLaf extends BasicLookAndFeel {
       // Text family should be used for relatively small sizes (<20pt), don't change to Display
       // see more about SF https://medium.com/@mach/the-secret-of-san-francisco-fonts-4b5295d9a745#.2ndr50z2v
       Font font = new Font(".SF NS Text", style, size);
-      if (!Font.DIALOG.equals(font.getFamily(ENGLISH))) {
+      if (!UIUtil.isDialogFont(font)) {
         return new FontUIResource(font);
       }
     }

platform/platform-impl/src/com/intellij/ui/Splash.java

@@ -174,7 +174,14 @@ public class Splash extends JDialog implements StartupProgress {
       final LicensingFacade provider = LicensingFacade.getInstance();
       if (provider != null) {
         UIUtil.applyRenderingHints(g);
-        g.setFont(new Font(UIUtil.ARIAL_FONT_NAME, Font.BOLD, uiScale(Registry.is("ide.new.about") ? 12 : SystemInfo.isUnix ? 10 : 11)));
+
+        Font font = SystemInfo.isMacOSElCapitan ? createFont(".SF NS Text") :
+                    SystemInfo.isMacOSYosemite ? createFont("HelveticaNeue-Regular") :
+                    null;
+        if (font == null || UIUtil.isDialogFont(font)) {
+          font = createFont(UIUtil.ARIAL_FONT_NAME);
+        }
+        g.setFont(font);
 
         g.setColor(textColor);
         final String licensedToMessage = provider.getLicensedToMessage();
@@ -200,6 +207,11 @@ public class Splash extends JDialog implements StartupProgress {
     return false;
   }
 
+  @NotNull
+  protected static Font createFont(String name) {
+    return new Font(name, Font.PLAIN, uiScale(Registry.is("ide.new.about") ? 12 : SystemInfo.isUnix ? 10 : 11));
+  }
+
   private static float JBUI_INIT_SCALE = JBUI.scale(1f);
   private static float uiScale(float f) { return f * JBUI_INIT_SCALE; }
   private static int uiScale(int i) { return (int)(i * JBUI_INIT_SCALE); }

platform/util/src/com/intellij/util/ui/FontInfo.java

@@ -171,7 +171,7 @@ public final class FontInfo {
       if (font == null) {
         font = new Font(name, Font.PLAIN, DEFAULT_SIZE);
         // Java uses Dialog family for nonexistent fonts 
-        if (!Font.DIALOG.equals(name) && Font.DIALOG.equals(font.getFamily(ENGLISH))) {
+        if (!Font.DIALOG.equals(name) && UIUtil.isDialogFont(font)) {
           throw new IllegalArgumentException("not supported " + font);
         }
       }

platform/util/src/com/intellij/util/ui/UIUtil.java

@@ -84,6 +84,8 @@ import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.regex.Pattern;
 
+import static java.util.Locale.ENGLISH;
+
 /**
  * @author max
  */
@@ -221,6 +223,10 @@ public class UIUtil {
     }
   }
 
+  public static boolean isDialogFont(Font font) {
+    return Font.DIALOG.equals(font.getFamily(ENGLISH));
+  }
+
   public enum FontSize {NORMAL, SMALL, MINI}
 
   public enum ComponentStyle {LARGE, REGULAR, SMALL, MINI}