replace kIgnore_SkAlphaType with kUnknown_SkAlphaType

src/core/SkBitmapDevice.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkConfig8888.h"
 #include "SkDeviceProperties.h"
 #include "SkDraw.h"
 #include "SkRasterClip.h"
 #include "SkShader.h"
 #include "SkSurface.h"
 
 #define CHECK_FOR_ANNOTATION(paint) \
     do { if (paint.getAnnotation()) { return; } } while (0)
 
 static bool valid_for_bitmap_device(const SkImageInfo& info,
                                     SkAlphaType* newAlphaType) {
     if (info.width() < 0 || info.height() < 0) {
         return false;
     }
 
     // TODO: can we stop supporting kUnknown in SkBitmkapDevice?
     if (kUnknown_SkColorType == info.colorType()) {
         if (newAlphaType) {
-            *newAlphaType = kIgnore_SkAlphaType;
+            *newAlphaType = kUnknown_SkAlphaType;
         }
         return true;
     }
 
     switch (info.alphaType()) {
         case kPremul_SkAlphaType:
         case kOpaque_SkAlphaType:
             break;
         default:
             return false;
@@ skipping 337 matching lines @@
         paint.getRasterizer() ||
         paint.getPathEffect() ||
         paint.isFakeBoldText() ||
         paint.getStyle() != SkPaint::kFill_Style ||
         !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode))
     {
         return true;
     }
     return false;
 }