[smooth, raster] Fix up and align error codes.

FT_Render_Glyph picked up FAILURE or 1 returned from the raster
function, which became a confusing error code. Instead, return
Raster_Overflow in the unlikely event that banding does not help or
another meaningful error.

* src/smooth/ftgrays.c (gray_convert_glyph_inner, gray_convert_glyph):
Use Raster_Overflow when the rendering pool is exhausted and return it
if banding does not help.
(gray_raster_render): Use Smooth_Err_Ok.

* src/raster/ftraster.c (Render_Single_Pass): Return Raster_Overflow
if banding does not help or another error code.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/raster/ftraster.c b/src/raster/ftraster.c
index 089a098ab..828c1368e 100644
--- a/src/raster/ftraster.c
+++ b/src/raster/ftraster.c
@@ -3050,7 +3050,7 @@
       if ( Convert_Glyph( RAS_VARS flipped ) )
       {
         if ( ras.error != Raster_Err_Raster_Overflow )
-          return FAILURE;
+          return ras.error;
 
         ras.error = Raster_Err_Ok;
 
@@ -3068,7 +3068,7 @@
         if ( ras.band_top >= 7 || k < i )
         {
           ras.band_top = 0;
-          ras.error    = FT_THROW( Invalid_Outline );
+          ras.error    = FT_THROW( Raster_Overflow );
 
           return ras.error;
         }
@@ -3089,7 +3089,7 @@
       }
     }
 
-    return SUCCESS;
+    return Raster_Err_Ok;
   }