Support more swizzles to 565 in SkCodec

src/codec/SkCodec.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBmpCodec.h"
 #include "SkCodec.h"
 #include "SkData.h"
@@ skipping 105 matching lines @@
             return kInvalidParameters;
         }
     } else {
         if (ctableCount) {
             *ctableCount = 0;
         }
         ctableCount = NULL;
         ctable = NULL;
     }
 
+    {
+        SkAlphaType canonical;
+        if (!SkColorTypeValidateAlphaType(info.colorType(), info.alphaType(), &canonical)
+            || canonical != info.alphaType())
+        {
+            return kInvalidConversion;
+        }
+    }
+
     // Default options.
     Options optsStorage;
     if (NULL == options) {
         options = &optsStorage;
     }
     const Result result = this->onGetPixels(info, pixels, rowBytes, *options, ctable, ctableCount);
 
     if ((kIncompleteInput == result || kSuccess == result) && ctableCount) {
         SkASSERT(*ctableCount >= 0 && *ctableCount <= 256);
     }
     return result;
 }
 
 SkCodec::Result SkCodec::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     return this->getPixels(info, pixels, rowBytes, NULL, NULL, NULL);
 }