add peekPixels to SkCanvas and SkSurface

include/core/SkBitmap.h

 /*
  * 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.
  */
 
 #ifndef SkBitmap_DEFINED
 #define SkBitmap_DEFINED
 
@@ skipping 879 matching lines @@
 }
 
 inline SkPMColor SkBitmap::getIndex8Color(int x, int y) const {
     SkASSERT(fPixels);
     SkASSERT(this->config() == kIndex8_Config);
     SkASSERT((unsigned)x < (unsigned)this->width() && (unsigned)y < (unsigned)this->height());
     SkASSERT(fColorTable);
     return (*fColorTable)[*((const uint8_t*)fPixels + y * fRowBytes + x)];
 }
 
+///////////////////////////////////////////////////////////////////////////////
+//
+// Helpers until we can fully deprecate SkBitmap::Config
+//
+extern SkBitmap::Config SkColorTypeToBitmapConfig(SkColorType);
+extern SkColorType SkBitmapConfigToColorType(SkBitmap::Config);
+
 #endif