[raster, smooth] Handle FT_RENDER_POOL_SIZE better.

* src/raster/ftraster.c (FT_MAX_BLACK_POOL): New macro.
(ft_black_render): Updated.
* src/smooth/ftgrays.c (FT_MAX_GRAY_POOL): New macro.
(gray_raster_render): Updated.

ChangeLog

@@ -1,3 +1,12 @@
+2016-06-17  Alexei Podtelezhnikov  <apodtele@gmail.com>
+
+	[raster, smooth] Handle FT_RENDER_POOL_SIZE better.
+
+	* src/raster/ftraster.c (FT_MAX_BLACK_POOL): New macro.
+	(ft_black_render): Updated.
+	* src/smooth/ftgrays.c (FT_MAX_GRAY_POOL): New macro.
+	(gray_raster_render): Updated.
+
 2016-06-16  Werner Lemberg  <wl@gnu.org>
 
 	* src/base/md5.c: Updated to recent version.

src/raster/ftraster.c

@@ -179,8 +179,6 @@
 #define FT_ERR_XCAT( x, y )  x ## y
 #define FT_ERR_CAT( x, y )   FT_ERR_XCAT( x, y )
 
-#define FT_MAX( a, b )  ( (a) > (b) ? (a) : (b) )
-
   /* This macro is used to indicate that a function parameter is unused. */
   /* Its purpose is simply to reduce compiler warnings.  Note also that  */
   /* simply defining it as `(void)x' doesn't avoid warnings with certain */
@@ -459,6 +457,12 @@
 #define IS_TOP_OVERSHOOT( x )    \
           (Bool)( x - FLOOR( x ) >= ras.precision_half )
 
+#if FT_RENDER_POOL_SIZE > 2048
+#define FT_MAX_BLACK_POOL  ( FT_RENDER_POOL_SIZE / sizeof ( Long ) )
+#elif
+#define FT_MAX_BLACK_POOL  ( 2048 / sizeof ( Long ) )
+#endif
+
   /* The most used variables are positioned at the top of the structure. */
   /* Thus, their offset can be coded with less opcodes, resulting in a   */
   /* smaller executable.                                                 */
@@ -3138,7 +3142,7 @@
 
     black_TWorker  worker[1];
 
-    Long  buffer[FT_MAX( FT_RENDER_POOL_SIZE, 2048 ) / sizeof ( Long )];
+    Long  buffer[FT_MAX_BLACK_POOL];
 
 
     if ( !raster )

src/smooth/ftgrays.c

@@ -106,7 +106,6 @@
 #define FT_BEGIN_STMNT  do {
 #define FT_END_STMNT    } while ( 0 )
 
-#define FT_MAX( a, b )  ( (a) > (b) ? (a) : (b) )
 #define FT_ABS( a )     ( (a) < 0 ? -(a) : (a) )
 
 
@@ -391,10 +390,6 @@ typedef ptrdiff_t  FT_PtrDist;
   typedef long  TArea;    /* cell areas, coordinate products   */
 
 
-  /* maximum number of gray spans in a call to the span callback */
-#define FT_MAX_GRAY_SPANS  32
-
-
   typedef struct TCell_*  PCell;
 
   typedef struct  TCell_
@@ -407,6 +402,17 @@ typedef ptrdiff_t  FT_PtrDist;
   } TCell;
 
 
+  /* maximum number of gray spans in a call to the span callback */
+#define FT_MAX_GRAY_SPANS  32
+
+  /* maximum number of gray cells in the buffer */
+#if FT_RENDER_POOL_SIZE > 2048
+#define FT_MAX_GRAY_POOL  ( FT_RENDER_POOL_SIZE / sizeof ( TCell ) )
+#elif
+#define FT_MAX_GRAY_POOL  ( 2048 / sizeof ( TCell ) )
+#endif
+
+
 #if defined( _MSC_VER )      /* Visual C++ (and Intel C++) */
   /* We disable the warning `structure was padded due to   */
   /* __declspec(align())' in order to compile cleanly with */
@@ -2024,10 +2030,7 @@ typedef ptrdiff_t  FT_PtrDist;
 
     gray_TWorker  worker[1];
 
-    TCell  buffer[FT_MAX( FT_RENDER_POOL_SIZE, 2048 ) / sizeof ( TCell )];
-    long   buffer_size = sizeof ( buffer );
-    int    band_size   = (int)( buffer_size /
-                                (long)( sizeof ( TCell ) * 8 ) );
+    TCell  buffer[FT_MAX_GRAY_POOL];
 
 
     if ( !raster )
@@ -2098,12 +2101,12 @@ typedef ptrdiff_t  FT_PtrDist;
       ras.clip_box.yMax =  32767L;
     }
 
-    gray_init_cells( RAS_VAR_ buffer, buffer_size );
+    gray_init_cells( RAS_VAR_ buffer, sizeof ( buffer ) );
 
     ras.outline        = *outline;
     ras.num_cells      = 0;
     ras.invalid        = 1;
-    ras.band_size      = band_size;
+    ras.band_size      = FT_MAX_GRAY_POOL / 8;
     ras.num_gray_spans = 0;
     ras.span_y         = 0;