ARM64 NEON SIMD support for YCC-to-RGB565 conversion

git-svn-id: svn+ssh://svn.code.sf.net/p/libjpeg-turbo/code/trunk@1386 632fc199-4ca6-4c93-a231-07263d6284db

simd/jsimd_arm64.c

@@ -98,6 +98,17 @@ jsimd_can_ycc_rgb (void)
 GLOBAL(int)
 jsimd_can_ycc_rgb565 (void)
 {
+  init_simd();
+
+  /* The code is optimised for these values only */
+  if (BITS_IN_JSAMPLE != 8)
+    return 0;
+  if (sizeof(JDIMENSION) != 4)
+    return 0;
+
+  if (simd_support & JSIMD_ARM_NEON)
+    return 1;
+
   return 0;
 }
 
@@ -145,7 +156,7 @@ jsimd_ycc_rgb_convert (j_decompress_ptr cinfo,
     case JCS_EXT_ARGB:
       neonfct=jsimd_ycc_extxrgb_convert_neon;
       break;
-  default:
+    default:
       neonfct=jsimd_ycc_extrgb_convert_neon;
       break;
   }
@@ -159,6 +170,9 @@ jsimd_ycc_rgb565_convert (j_decompress_ptr cinfo,
                           JSAMPIMAGE input_buf, JDIMENSION input_row,
                           JSAMPARRAY output_buf, int num_rows)
 {
+  if (simd_support & JSIMD_ARM_NEON)
+    jsimd_ycc_rgb565_convert_neon(cinfo->output_width, input_buf, input_row,
+                                  output_buf, num_rows);
 }
 
 GLOBAL(int)