Minor, fix double-promotion warnings (#1221)

src/dump-emoji.cc

diff --git a/src/dump-emoji.cc b/src/dump-emoji.cc
index 3e0d668..b5ec30e 100644
--- a/src/dump-emoji.cc
+++ b/src/dump-emoji.cc
@@ -146,7 +146,7 @@
 	  int r = (color >> 8) & 0xFF;
 	  int g = (color >> 16) & 0xFF;
 	  int b = (color >> 24) & 0xFF;
-	  cairo_set_source_rgba (cr, r / 255.f, g / 255.f, b / 255.f, alpha);
+	  cairo_set_source_rgba (cr, r / 255., g / 255., b / 255., alpha);
 
 	  cairo_glyph_t glyph;
 	  glyph.index = glyph_id;

src/hb-common.cc

diff --git a/src/hb-common.cc b/src/hb-common.cc
index 16f8701..41b1601 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -1072,7 +1072,7 @@
   while (len && s[len - 1] == ' ')
     len--;
   s[len++] = '=';
-  len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%g", variation->value));
+  len += MAX (0, snprintf (s + len, ARRAY_LENGTH (s) - len, "%g", (double) variation->value));
 
   assert (len < ARRAY_LENGTH (s));
   len = MIN (len, size - 1);

src/hb-ot-var-fvar-table.hh

diff --git a/src/hb-ot-var-fvar-table.hh b/src/hb-ot-var-fvar-table.hh
index 1d17a97..96c39c1 100644
--- a/src/hb-ot-var-fvar-table.hh
+++ b/src/hb-ot-var-fvar-table.hh
@@ -177,7 +177,7 @@
       v = (v - axis.default_value) / (axis.default_value - axis.min_value);
     else
       v = (v - axis.default_value) / (axis.max_value - axis.default_value);
-    return (int) (v * 16384. + (v >= 0. ? .5 : -.5));
+    return (int) (v * 16384.f + (v >= 0.f ? .5f : -.5f));
   }
 
   protected: