[util] Refactor hb-view completely

Now we can use the same code to do other utils...

util/view-cairo.hh

diff --git a/util/view-cairo.hh b/util/view-cairo.hh
new file mode 100644
index 0000000..4b09d6f
--- /dev/null
+++ b/util/view-cairo.hh
@@ -0,0 +1,63 @@
+/*
+ * Copyright © 2011  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "options.hh"
+
+#include <cairo-ft.h>
+#include <hb-ft.h>
+
+#ifndef VIEW_CAIRO_HH
+#define VIEW_CAIRO_HH
+
+struct view_cairo_t : output_options_t, view_options_t {
+  view_cairo_t (option_parser_t *parser)
+	       : output_options_t (parser),
+	         view_options_t (parser) {}
+  ~view_cairo_t (void) {
+    if (debug)
+      cairo_debug_reset_static_data ();
+  }
+
+  void init (const font_options_t *font_opts);
+  void consume_line (hb_buffer_t  *buffer,
+		     const char   *text,
+		     unsigned int  text_len);
+  void finish (const font_options_t *font_opts);
+
+  protected:
+
+  void render (const font_options_t *font_opts);
+  cairo_scaled_font_t *create_scaled_font (const font_options_t *font_opts);
+  void get_surface_size (cairo_scaled_font_t *scaled_font, double *w, double *h);
+  cairo_t *create_context (double w, double h);
+  void draw (cairo_t *cr);
+  double line_width (unsigned int i);
+
+  GArray *lines;
+  unsigned int upem;
+};
+
+#endif