linux: Round font sizes when going from points to pixels.

ui/gfx/pango_util.cc

 // Copyright (c) 2012 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 "ui/gfx/pango_util.h"
 
 #include <cairo/cairo.h>
 #include <pango/pango.h>
 #include <pango/pangocairo.h>
 #include <string>
@@ skipping 212 matching lines @@
     }
 
     pango_layout_set_text(layout, utf8.data(), utf8.size());
   }
 
   ScopedPangoFontDescription desc(pango_font_description_from_string(
       font_list.GetFontDescriptionString().c_str()));
   pango_layout_set_font_description(layout, desc.get());
 }
 
-size_t GetPangoFontSizeInPixels(PangoFontDescription* pango_font) {
-  size_t size_in_pixels = pango_font_description_get_size(pango_font);
-  if (pango_font_description_get_size_is_absolute(pango_font)) {
-    // If the size is absolute, then it's in Pango units rather than points.
-    // There are PANGO_SCALE Pango units in a device unit (pixel).
-    size_in_pixels /= PANGO_SCALE;
-  } else {
-    // Otherwise, we need to convert from points.
-    size_in_pixels = size_in_pixels * GetPixelsInPoint() / PANGO_SCALE;
-  }
-  return size_in_pixels;
+int GetPangoFontSizeInPixels(PangoFontDescription* pango_font) {
+  // If the size is absolute, then it's in Pango units rather than points. There
+  // are PANGO_SCALE Pango units in a device unit (pixel).
+  if (pango_font_description_get_size_is_absolute(pango_font))
+    return pango_font_description_get_size(pango_font) / PANGO_SCALE;
+
+  // Otherwise, we need to convert from points.
+  return static_cast<int>(GetPixelsInPoint() *
+      pango_font_description_get_size(pango_font) / PANGO_SCALE + 0.5);
 }
 
 PangoFontMetrics* GetPangoFontMetrics(PangoFontDescription* desc) {
   static std::map<int, PangoFontMetrics*>* desc_to_metrics = NULL;
   static PangoContext* context = NULL;
 
   if (!context) {
     context = GetPangoContext();
     pango_context_set_language(context, pango_language_get_default());
   }
 
   if (!desc_to_metrics)
     desc_to_metrics = new std::map<int, PangoFontMetrics*>();
 
   const int desc_hash = pango_font_description_hash(desc);
   std::map<int, PangoFontMetrics*>::iterator i =
       desc_to_metrics->find(desc_hash);
 
   if (i == desc_to_metrics->end()) {
     PangoFontMetrics* metrics = pango_context_get_metrics(context, desc, NULL);
     desc_to_metrics->insert(std::make_pair(desc_hash, metrics));
     return metrics;
   }
   return i->second;
 }
 
 }  // namespace gfx