Make SkSwizzler::Fill() support 565

src/codec/SkSwizzler.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 "SkCodecPriv.h"
 #include "SkColorPriv.h"
 #include "SkSwizzler.h"
@@ skipping 452 matching lines @@
             break;
         case kGray_8_SkColorType:
             // If the destination is kGray, the caller passes in an 8-bit color.
             // We will not assert that the high bits of colorOrIndex must be zeroed.
             // This allows us to take advantage of the fact that the low 8 bits of an
             // SKPMColor may be a valid a grayscale color.  For example, the low 8
             // bits of SK_ColorBLACK are identical to the grayscale representation
             // for black. 
             memset(dstStartRow, (uint8_t) colorOrIndex, bytesToFill);
             break;
+        case kRGB_565_SkColorType:
+            // If the destination is k565, the caller passes in a 16-bit color.
+            // We will not assert that the high bits of colorOrIndex must be zeroed.
+            // This allows us to take advantage of the fact that the low 16 bits of an
+            // SKPMColor may be a valid a 565 color.  For example, the low 16
+            // bits of SK_ColorBLACK are identical to the 565 representation
+            // for black.
+            memset(dstStartRow, (uint16_t) colorOrIndex, bytesToFill);
+            break;
         default:
             SkCodecPrintf("Error: Unsupported dst color type for fill().  Doing nothing.\n");
             SkASSERT(false);
             break;
     }
 }