Expand modulate, add, subtract, extract component glsl helpers.

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 66 matching lines @@
     kB_GrColorComponentFlag = 1 << (GrColor_SHIFT_B / 8),
     kA_GrColorComponentFlag = 1 << (GrColor_SHIFT_A / 8),
 
     kRGB_GrColorComponentFlags = (kR_GrColorComponentFlag | kG_GrColorComponentFlag |
                                   kB_GrColorComponentFlag),
 
     kRGBA_GrColorComponentFlags = (kR_GrColorComponentFlag | kG_GrColorComponentFlag |
                                    kB_GrColorComponentFlag | kA_GrColorComponentFlag)
 };
 
+static inline char GrColorComponentFlagToChar(GrColorComponentFlags component) {
+    GrAssert(GrIsPow2(component));
+    switch (component) {
+        case kR_GrColorComponentFlag:
+            return 'r';
+        case kG_GrColorComponentFlag:
+            return 'g';
+        case kB_GrColorComponentFlag:
+            return 'b';
+        case kA_GrColorComponentFlag:
+            return 'a';
+        default:
+            GrCrash("Invalid color component flag.");
+            return '\0';
+    }
+}
+
 static inline uint32_t GrPixelConfigComponentMask(GrPixelConfig config) {
     GrAssert(config >= 0 && config < kGrPixelConfigCnt);
     static const uint32_t kFlags[] = {
         0,                              // kUnknown_GrPixelConfig
         kA_GrColorComponentFlag,        // kAlpha_8_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kIndex_8_GrPixelConfig
         kRGB_GrColorComponentFlags,     // kRGB_565_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kRGBA_4444_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kRGBA_8888_GrPixelConfig
         kRGBA_GrColorComponentFlags,    // kBGRA_8888_GrPixelConfig
     };
     return kFlags[config];
 
     GR_STATIC_ASSERT(0 == kUnknown_GrPixelConfig);
     GR_STATIC_ASSERT(1 == kAlpha_8_GrPixelConfig);
     GR_STATIC_ASSERT(2 == kIndex_8_GrPixelConfig);
     GR_STATIC_ASSERT(3 == kRGB_565_GrPixelConfig);
     GR_STATIC_ASSERT(4 == kRGBA_4444_GrPixelConfig);
     GR_STATIC_ASSERT(5 == kRGBA_8888_GrPixelConfig);
     GR_STATIC_ASSERT(6 == kBGRA_8888_GrPixelConfig);
     GR_STATIC_ASSERT(SK_ARRAY_COUNT(kFlags) == kGrPixelConfigCnt);
 }
 
 #endif