add Measure() into bmf

src/sillysagiri/BMF.java

@@ -126,6 +126,53 @@ public class BMF {
     }
   }
 
+  // TODO: handle multiline
+  public short[] Measure(String str)
+  {
+    short left = 0;
+    short right = 0;
+    short top = 0;
+    short bottom = 0;
+    short[] cursor = new short[]{0, 0};
+    boolean isFirst = true;
+
+    for (int i=0; i<str.length(); i++)
+    {
+      char index = str.charAt(i);
+      if (index != '\n' && (index < 32 || index > 127)) index = 127;
+
+      if (index == '\n')
+      {
+        isFirst = true;
+        cursor[1] += lineHeight;
+        cursor[0] = 0;
+        continue;
+      }
+
+      short[] ch = chars[index-32];
+      int[] offset = new int[]{ch[XOFF]+cursor[0], ch[YOFF]+cursor[1]};
+
+      // check first XOFF
+      if (isFirst)
+      {
+        left = (short)Math.min(ch[XOFF], left);
+        isFirst = false;
+      }
+
+      right = (short)Math.max(right, offset[0]+ch[WIDTH]);
+      top = (short)Math.min(top, offset[1]);
+      bottom = (short)Math.max(bottom, offset[1]+ch[HEIGHT]);
+      
+      cursor[0] += ch[XADV];
+    }
+
+    return new short[]{
+      (short)(right+Math.abs(left)), // x
+      (short)(bottom+Math.abs(top)), // y
+      left, top // xoff, yoff
+    };
+  }
+
   public void Draw(Graphics g, String str, int x, int y)
   {
     short[] cursor = new short[]{0, 0};
@@ -148,7 +195,7 @@ public class BMF {
         img,
         ch[X], ch[Y], ch[WIDTH], ch[HEIGHT],
         Sprite.TRANS_NONE,
-        x+offset[0], y+offset[1],
+        offset[0], offset[1],
         Graphics.TOP | Graphics.LEFT);
       
       cursor[0] += ch[XADV];