Implementation of BFont::Blocks

BFont::Blocks is now implemented in ServerFont, via a call through the
app_server.  It uses fontconfig to iterate through a charset of a font
and stores the defined blocks in a bitmap.

A new API was added, BFont::IncludesBlock, that will allow for arbitrary
testing of a given Unicode block. Since nothing is cached, searching
through an entire charset for a series of Unicode blocks can be quite
slow. In a given block there may be only 1 or 2 characters actually
defined so every character within a block needs to be checked until one
is found, which in a degenerate case will mean the entire block is
checked.

Signed-off-by: Axel Dörfler <[email protected]>

headers/private/app/ServerProtocol.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2001-2015, Haiku.
+ * Copyright 2001-2016, Haiku.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -143,6 +143,8 @@ enum {
 	AS_GET_HAS_GLYPHS,
 	AS_GET_GLYPH_SHAPES,
 	AS_GET_TRUNCATED_STRINGS,
+	AS_GET_UNICODE_BLOCKS,
+	AS_GET_HAS_UNICODE_BLOCK,
 
 	// Screen methods
 	AS_VALID_SCREEN_ID,