experiment: float color components

include/core/SkColorPriv.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 SkColorPriv_DEFINED
 #define SkColorPriv_DEFINED
 
@@ skipping 53 matching lines @@
      SK_G32_SHIFT == SK_RGBA_G32_SHIFT &&    \
      SK_B32_SHIFT == SK_RGBA_B32_SHIFT)
 
 #define LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA  \
     (SK_A32_SHIFT == SK_BGRA_A32_SHIFT &&    \
      SK_R32_SHIFT == SK_BGRA_R32_SHIFT &&    \
      SK_G32_SHIFT == SK_BGRA_G32_SHIFT &&    \
      SK_B32_SHIFT == SK_BGRA_B32_SHIFT)
 
 
+#define SK_A_INDEX  (SK_A32_SHIFT/8)
+#define SK_R_INDEX  (SK_R32_SHIFT/8)
+#define SK_G_INDEX  (SK_G32_SHIFT/8)
+#define SK_B_INDEX  (SK_B32_SHIFT/8)
+
 #if defined(SK_PMCOLOR_IS_RGBA) && !LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_RGBA
     #error "SK_PMCOLOR_IS_RGBA does not match SK_*32_SHIFT values"
 #endif
 
 #if defined(SK_PMCOLOR_IS_BGRA) && !LOCAL_PMCOLOR_SHIFTS_EQUIVALENT_TO_BGRA
     #error "SK_PMCOLOR_IS_BGRA does not match SK_*32_SHIFT values"
 #endif
 
 #if !defined(SK_PMCOLOR_IS_RGBA) && !defined(SK_PMCOLOR_IS_BGRA)
     // deduce which to define from the _SHIFT defines
@@ skipping 969 matching lines @@
     int srcG = SkColorGetG(src);
     int srcB = SkColorGetB(src);
 
     for (int i = 0; i < width; i++) {
         dst[i] = SkBlendLCD16Opaque(srcR, srcG, srcB, dst[i], mask[i],
                                     opaqueDst);
     }
 }
 
 #endif