lots of sRGB and F16 blits

src/core/SkBlitter.cpp

 /*
  * 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.
  */
 
 #include "SkBlitter.h"
 #include "SkAntiRun.h"
 #include "SkColor.h"
@@ skipping 920 matching lines @@
                 }
             }
             break;
 
         case kRGBA_F16_SkColorType:
         // kU16_SkColorType:
             blitter = SkBlitter_ARGB64_Create(device, *paint, shaderContext, allocator);
             break;
 
         default:
-            SkDEBUGFAIL("unsupported device config");
-            blitter = allocator->createT<SkNullBlitter>();
             break;
     }
 
+    if (!blitter) {
+        blitter = allocator->createT<SkNullBlitter>();
+    }
+
     if (shader3D) {
         SkBlitter* innerBlitter = blitter;
         // innerBlitter was allocated by allocator, which will delete it.
         // We know shaderContext or its proxies is of type Sk3DShaderContext, so we need to
         // wrapper the blitter to notify it when we see an emboss mask.
         blitter = allocator->createT<Sk3DBlitter>(innerBlitter, shaderContext);
     }
     return blitter;
 }
 
@@ skipping 39 matching lines @@
     fShaderContext->~Context();
     SkShader::Context* ctx = fShader->createContext(rec, (void*)fShaderContext);
     if (nullptr == ctx) {
         // Need a valid context in fShaderContext's storage, so we can later (or our caller) call
         // the in-place destructor.
         new (fShaderContext) SkZeroShaderContext(*fShader, rec);
         return false;
     }
     return true;
 }