Add Pepper TrueType font API plumbing.

content/browser/renderer_host/pepper/pepper_truetype_font_list_linux.cc

Index: content/browser/renderer_host/pepper/pepper_truetype_font_list_linux.cc
diff --git a/content/browser/renderer_host/pepper/pepper_truetype_font_list_linux.cc b/content/browser/renderer_host/pepper/pepper_truetype_font_list_linux.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b077753f49272e95e60d576b4ff80cca933ceac4
--- /dev/null
+++ b/content/browser/renderer_host/pepper/pepper_truetype_font_list_linux.cc
@@ -0,0 +1,32 @@
+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/renderer_host/pepper/pepper_truetype_font_list.h"
+
+#include <pango/pango.h>
+#include <pango/pangocairo.h>
+
+#include <set>
+#include <string>
+
+namespace content {
+
+void GetFontFamilies_SlowBlocking(std::vector<std::string>* font_families) {
+  PangoFontMap* font_map = ::pango_cairo_font_map_get_default();
+  PangoFontFamily** families = NULL;
+  int num_families = 0;
+  ::pango_font_map_list_families(font_map, &families, &num_families);
+
+  std::set<std::string> sorted_families;
+  for (int i = 0; i < num_families; i++)
+    sorted_families.insert(::pango_font_family_get_name(families[i]));

[dmichael (off chromium), 2013/03/13 20:20:25]

BTW, why do you do the intermediate set thing? Is it to make sure they are
unique? Ordered? A comment might be good. If it's an ordering thing, you could
instead use only the vector and sort it after the elements are added.

[bbudge, 2013/03/13 21:20:37]

This code is originally from content/common/font_list_linux.cc. I assumed it was
because there might be duplicates. If it's just to sort, I can just use a vector
and sort that when it's full. Brett?
On 2013/03/13 20:20:25, dmichael wrote:

[bbudge, 2013/03/13 22:48:50]

I removed the use of a set. I sort the vector in the host object so we don't
replicate this code for every platform. Mac may return the fonts already sorted,
but this isolates us if that ever changed and has little perf impact.

+  g_free(families);
+

[dmichael (off chromium), 2013/03/13 20:20:25]

DCHECK(font_families->empty());
?

[bbudge, 2013/03/13 21:20:37]

See comment below.
On 2013/03/13 20:20:25, dmichael wrote:

[bbudge, 2013/03/13 22:48:50]

This API is pretty foolproof. There is no provision for returning an error.
Also, a platform could in theory be configured to have no true type fonts.
On 2013/03/13 20:20:25, dmichael wrote:

+  font_families->reserve(sorted_families.size());
+  std::set<std::string>::const_iterator iter = sorted_families.begin();
+  for (; iter != sorted_families.end(); ++iter)
+    font_families->push_back(*iter);

[dmichael (off chromium), 2013/03/13 20:20:25]

could also do font_families->insert(font_families.end(),
sorted_families.begin(), sorted_families.end());

[bbudge, 2013/03/13 22:48:50]

Eliminated 'set'
On 2013/03/13 20:20:25, dmichael wrote:

+}
+
+}  // namespace content