fix trivial matrix computation

src/core/SkBitmapProcShader.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkBitmapProcShader.h"
 #include "SkColorPriv.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 124 matching lines @@
             flags |= kConstInY16_Flag;
         }
     }
 
     fFlags = flags;
     return true;
 }
 
 void SkBitmapProcShader::endContext() {
     fState.fOrigBitmap.unlockPixels();
+    fState.endContext();
     this->INHERITED::endContext();
 }
 
 #define BUF_MAX     128
 
 #define TEST_BUFFER_OVERRITEx
 
 #ifdef TEST_BUFFER_OVERRITE
     #define TEST_BUFFER_EXTRA   32
     #define TEST_PATTERN    0x88888888
@@ skipping 203 matching lines @@
     if (NULL == texture) {
         SkDebugf("Couldn't convert bitmap to texture.\n");
         return NULL;
     }
 
     GrEffectRef* effect = GrSimpleTextureEffect::Create(texture, matrix, params);
     GrUnlockAndUnrefCachedBitmapTexture(texture);
     return effect;
 }
 #endif