fix textwidth func

examples/unicode.nim

@@ -65,10 +65,13 @@ proc gameInit() =
   discard
 
 var iFrame: int
+var isPrintr: bool
 proc gameUpdate(dt: float32) =
   if keyp(K_ESCAPE): shutdown()
   if keyp(K_SPACE) or iFrame > 1000:
     langIdx.inc
+    if langIdx >= langs.len:
+      isPrintr = not isPrintr
     langIdx = langIdx mod langs.len
     iFrame = 0
     setFont(langIdx)
@@ -93,7 +96,10 @@ proc gameDraw() =
         cls()
         h = 0
       setColor(color)
-      print(&"{language}: {msg}", 0, h, scale)
+      if not isPrintr:
+        print(&"{language}: {msg}", 0, h, scale)
+      else:
+        printr(&"{language}: {msg}", screenWidth, h, scale)
       h += msg.textHeight(scale)
       color.inc
       color = color mod 15 + 1 # rnd(1,16)
@@ -103,7 +109,7 @@ proc gameDraw() =
 
   setColor(6)
   printr(&"frame: {iFrame}", screenWidth, screenHeight - fontHeight())
-  printr(&"font: " & langs[langIdx][0..^5], screenWidth, screenHeight - fontHeight() * 2 * scale - scale)
+  printr("font: " & langs[langIdx][0..^5], screenWidth, screenHeight - fontHeight() * 2 * scale - scale)
   discard
 
 nico.init("nico", "unicode test")

nico.nim

@@ -2333,8 +2333,12 @@ proc textWidth*(text: string, scale: Pint = 1): Pint =
     lineWidth = 0
     for c in line.runes:
       if not currentFont.rects.hasKey(c):
-        raise newException(Exception, "character not in font: '" & $c & "' = " & $(c.int))
-      lineWidth += currentFont.rects[c].w*scale + scale
+        let unknown = '?'.Rune
+        if not currentFont.rects.hasKey(unknown):
+          raise newException(Exception, "character not in font: '" & $c & "' = " & $(c.int))
+        lineWidth += currentFont.rects[unknown].w*scale + scale
+      else:
+        lineWidth += currentFont.rects[c].w*scale + scale
     if result < lineWidth:
       result = lineWidth