Implement Porter Duff XP with a blend table

include/gpu/GrColor.h

 
 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
@@ skipping 124 matching lines @@
 /**
  * Flags used for bitfields of color components. They are defined so that the bit order reflects the
  * GrColor shift order.
  */
 enum GrColorComponentFlags {
     kR_GrColorComponentFlag = 1 << (GrColor_SHIFT_R / 8),
     kG_GrColorComponentFlag = 1 << (GrColor_SHIFT_G / 8),
     kB_GrColorComponentFlag = 1 << (GrColor_SHIFT_B / 8),
     kA_GrColorComponentFlag = 1 << (GrColor_SHIFT_A / 8),
 
+    kNone_GrColorComponentFlags = 0,
+
     kRGB_GrColorComponentFlags = (kR_GrColorComponentFlag | kG_GrColorComponentFlag |
                                   kB_GrColorComponentFlag),
 
     kRGBA_GrColorComponentFlags = (kR_GrColorComponentFlag | kG_GrColorComponentFlag |
                                    kB_GrColorComponentFlag | kA_GrColorComponentFlag)
 };
 
+GR_MAKE_BITFIELD_OPS(GrColorComponentFlags)
+
 static inline char GrColorComponentFlagToChar(GrColorComponentFlags component) {
     SkASSERT(SkIsPow2(component));
     switch (component) {
         case kR_GrColorComponentFlag:
             return 'r';
         case kG_GrColorComponentFlag:
             return 'g';
         case kB_GrColorComponentFlag:
             return 'b';
         case kA_GrColorComponentFlag:
@@ skipping 37 matching lines @@
     GR_STATIC_ASSERT(9  == kLATC_GrPixelConfig);
     GR_STATIC_ASSERT(10  == kR11_EAC_GrPixelConfig);
     GR_STATIC_ASSERT(11 == kASTC_12x12_GrPixelConfig);
     GR_STATIC_ASSERT(12 == kRGBA_float_GrPixelConfig);
     GR_STATIC_ASSERT(13 == kAlpha_half_GrPixelConfig);
     GR_STATIC_ASSERT(14 == kRGBA_half_GrPixelConfig);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kFlags) == kGrPixelConfigCnt);
 }
 
 #endif