Add missing fallback blending to SkA8_Shader_Blitter::blitMask()

src/core/SkBlitter_A8.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 "SkCoreBlitters.h"
@@ skipping 318 matching lines @@
     int height = clip.height();
     uint8_t* device = fDevice.getAddr8(x, y);
     const uint8_t* alpha = mask.getAddr8(x, y);
 
     SkPMColor*  span = fBuffer;
 
     while (--height >= 0) {
         fShader->shadeSpan(x, y, span, width);
         if (fXfermode) {
             fXfermode->xferA8(device, span, width, alpha);
+        } else {
+            for (int i = width - 1; i >= 0; --i) {
+                device[i] = aa_blend8(span[i], device[i], alpha[i]);
+            }
         }
 
         y += 1;
         device += fDevice.rowBytes();
         alpha += mask.fRowBytes;
     }
 }