[freetype2] GSoC-2020-anuj 6218c94: [sdf] Fix compiler warnings.

[Anuj Verma]

branch: GSoC-2020-anuj
commit 6218c942adc7571bbaac11e6c1a04e19a49a23d8
Author: Anuj Verma <anujv@iitbhilai.ac.in>
Commit: Anuj Verma <anujv@iitbhilai.ac.in>

    [sdf] Fix compiler warnings.
    
    * src/sdf/ftsdf.c (get_control_box): Use goto instead of letting the next 
case statement
      execute to avoid compiler warning [-Wimplicit-fallthrough=].
    
    * src/sdf/ftsdf.c (sdf_generate_bounding_box): Fix compiler warning due to 
signed
      unsigned mismatch.
    
    * src/sdf/ftsdfrend.c (ft_sdf_done): The function must have a return type 
of `void'
      to match the signature of `FT_Module_Destructor'.
---
 src/sdf/ftsdf.c     | 12 +++++++++++-
 src/sdf/ftsdfrend.c |  4 +---
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/sdf/ftsdf.c b/src/sdf/ftsdf.c
index ddd5964..f206f03 100644
--- a/src/sdf/ftsdf.c
+++ b/src/sdf/ftsdf.c
@@ -896,9 +896,15 @@
       cbox.yMax = edge.control_b.y;
 
       is_set = 1;
+
+      /* To avoid warning [-Wimplicit-fallthrough=] add  */
+      /* a break statement but jump to next edge before. */
+      goto conic;
+      break;
     }
     case SDF_EDGE_CONIC:
     {
+    conic:
       if ( is_set )
       {
         cbox.xMin = edge.control_a.x < cbox.xMin ?
@@ -920,9 +926,13 @@
 
         is_set = 1;
       }
+
+      goto line;
+      break;
     }
     case SDF_EDGE_LINE:
     {
+    line:
       if ( is_set )
       {
         cbox.xMin = edge.start_pos.x < cbox.xMin ?
@@ -3184,7 +3194,7 @@
           current_sign = dists[index].sign;
 
         /* clamp the values */
-        if ( dists[index].distance > FT_INT_16D16( spread ) )
+        if ( dists[index].distance > (FT_Int)FT_INT_16D16( spread ) )
           dists[index].distance = FT_INT_16D16( spread );
 
         /* convert from 16.16 to 6.10 */
diff --git a/src/sdf/ftsdfrend.c b/src/sdf/ftsdfrend.c
index d65d280..811f1d8 100644
--- a/src/sdf/ftsdfrend.c
+++ b/src/sdf/ftsdfrend.c
@@ -190,12 +190,10 @@
     return FT_Err_Ok;
   }
 
-  static FT_Error
+  static void
   ft_sdf_done( FT_Renderer  render )
   {
     FT_UNUSED( render );
-
-    return FT_Err_Ok;
   }
 
   /* generate signed distance field from a glyph's slot image */