create a macro for testing if skcolor and skpmcolor have same shift values

include/core/SkPostConfig.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkPostConfig_DEFINED
@@ skipping 188 matching lines @@
         #define SK_B32_SHIFT    8
         #define SK_A32_SHIFT    0
     #else
         #define SK_R32_SHIFT    0
         #define SK_G32_SHIFT    8
         #define SK_B32_SHIFT    16
         #define SK_A32_SHIFT    24
     #endif
 #endif
 
+#define SK_COLOR_MATCHES_PMCOLOR_BYTE_ORDER \
+    (SK_A32_SHIFT == 24 && SK_R32_SHIFT == 16 && SK_G32_SHIFT == 8 && SK_B32_SHIFT == 0)
+
 /**
  * SK_PMCOLOR_BYTE_ORDER can be used to query the byte order of SkPMColor at compile time. The
  * relationship between the byte order and shift values depends on machine endianness. If the shift
  * order is R=0, G=8, B=16, A=24 then ((char*)&pmcolor)[0] will produce the R channel on a little
  * endian machine and the A channel on a big endian machine. Thus, given those shifts values,
  * SK_PMCOLOR_BYTE_ORDER(R,G,B,A) will be true on a little endian machine and
  * SK_PMCOLOR_BYTE_ORDER(A,B,G,R) will be true on a big endian machine.
  */
 #ifdef SK_CPU_BENDIAN
     #define SK_PMCOLOR_BYTE_ORDER(C0, C1, C2, C3)     \
@@ skipping 165 matching lines @@
 #else
 #define SK_SIZE_T_SPECIFIER "%zu"
 #endif
 #endif
 
 //////////////////////////////////////////////////////////////////////
 
 #ifndef SK_ALLOW_STATIC_GLOBAL_INITIALIZERS
 #define SK_ALLOW_STATIC_GLOBAL_INITIALIZERS 1
 #endif