Graph/GraphUI: Move getDefault*() to FontFactory and add {get,set}FallbackFont() + Font.getBestCoverage(..); Use fallback-font in MediaButton in case chosen font doesn't match (foreign languages, e.g. 'zho' Chinese .. )

3 files changed, 58 insertions, 0 deletions

diff --git a/src/jogl/classes/com/jogamp/graph/font/Font.java b/src/jogl/classes/com/jogamp/graph/font/Font.java
index 26557ec00..068363ce4 100644
--- a/src/jogl/classes/com/jogamp/graph/font/Font.java
+++ b/src/jogl/classes/com/jogamp/graph/font/Font.java
@@ -384,6 +384,25 @@ public interface Font {
     /** Returns number of {@link Glyph} IDs available, i.e. retrievable via {@link #getGlyph(int)} [0..count). */
     int getGlyphCount();
 
+    /** Returns the number of defined {@link Glyph}s (coverage), i.e. not {@link Glyph#isUndefined()}, of given text. */
+    int getDefinedCount(final CharSequence text);
+
+    /**
+     * Returns {@link Font} with best coverage for given text while favoring {@code a}. See {@link #getDefinedCount(CharSequence)}.
+     * <pre>
+     * return a.getDefinedCount(text) >= b.getDefinedCount(text) ? a : b;
+     * </pre>
+     */
+    public static Font getBestCoverage(final Font a, final Font b, final CharSequence text) {
+        if( null != a && null != b ) {
+            return a.getDefinedCount(text) >= b.getDefinedCount(text) ? a : b;
+        } else if( null != a ) {
+            return a;
+        } else {
+            return b;
+        }
+    }
+
     /** Returns the {@link Glyph} (unicode) `codepoint` symbol mapped to given {@link Glyph} `name`. */
     char getGlyphCodepoint(final String name);
 
diff --git a/src/jogl/classes/com/jogamp/graph/font/FontFactory.java b/src/jogl/classes/com/jogamp/graph/font/FontFactory.java
index cd39abdfe..eb74c5696 100644
--- a/src/jogl/classes/com/jogamp/graph/font/FontFactory.java
+++ b/src/jogl/classes/com/jogamp/graph/font/FontFactory.java
@@ -217,4 +217,32 @@ public class FontFactory {
         final Character.UnicodeBlock block = Character.UnicodeBlock.of( c );
         return block != null && block != Character.UnicodeBlock.SPECIALS;
     }
+
+    /** Returns {@link FontSet#getDefault() default} {@link Font} of {@link #getDefault() default} {@link FontSet} or {@code null} if n/a */
+    public static Font getDefaultFont() {
+        try {
+            return getDefault().getDefault();
+        } catch(final IOException ioe) {
+            ioe.printStackTrace();
+            return null;
+        }
+    }
+
+    /** Returns the default symbols {@link Font} or {@code null} if n/a */
+    public static Font getSymbolsFont() {
+        try {
+            return get(SYMBOLS).getDefault();
+        } catch(final IOException ioe) {
+            ioe.printStackTrace();
+            return null;
+        }
+    }
+
+    /** Returns registered fallback {@link Font}, maybe {@code null}. See {@link #setFallbackFont(Font)}. */
+    public static synchronized Font getFallbackFont() {
+        return fallbackFont;
+    }
+    /** Registers given {@link Font} as the default fallback font. */
+    public static synchronized void setFallbackFont(final Font f) { fallbackFont = f; }
+    private static Font fallbackFont = null;
 }
diff --git a/src/jogl/classes/jogamp/graph/font/typecast/TypecastFont.java b/src/jogl/classes/jogamp/graph/font/typecast/TypecastFont.java
index c60629582..0a251a378 100644
--- a/src/jogl/classes/jogamp/graph/font/typecast/TypecastFont.java
+++ b/src/jogl/classes/jogamp/graph/font/typecast/TypecastFont.java
@@ -224,6 +224,17 @@ class TypecastFont implements Font {
     public int getGlyphCount() { return font.getGlyphCount(); }
 
     @Override
+    public int getDefinedCount(final CharSequence text) {
+        int res = 0;
+        for(int i=text.length()-1; i>=0; --i) {
+            if( !getGlyph(text.charAt(i)).isUndefined() ) {
+                ++res;
+            }
+        }
+        return res;
+    }
+
+    @Override
     public char getGlyphCodepoint(final String name) {
         final SymAndID value = nameToGlyph.get(name);
         if( null != value ) {