text: /*
   * Copyright 2012 Google Inc.
   *
   * Use of this source code is governed by a BSD-style license that can be
   * found in the LICENSE file.
   */
  
  #ifndef skdiff_utils_DEFINED
  #define skdiff_utils_DEFINED
  
  #include "tools/skdiff/skdiff.h"
  
  class SkBitmap;
  class SkData;
  class SkString;
  
  /** Returns true if the two buffers passed in are both non-nullptr,
   *  have the same length, and contain exactly the same byte values.
   */
  bool are_buffers_equal(SkData* skdata1, SkData* skdata2);
  
  /** Reads the file at the given path and returns its complete contents as an
   *  SkData object (or returns nullptr on error).
   */
  sk_sp<SkData> read_file(const char* file_path);
  
  /** Decodes the fileBits into the resource.fBitmap. Returns false on failure. */
  bool get_bitmap(
      sk_sp<SkData> fileBits, DiffResource& resource, bool sizeOnly, bool ignoreColorSpace);
  
  /** Writes the bitmap as a PNG to the path specified. */
  bool write_bitmap(const SkString& path, const SkBitmap& bitmap);
  
  /** Given an image filename, returns the name of the file containing
   *  the associated difference image.
   */
  SkString filename_to_diff_filename(const SkString& filename);
  
  /** Given an image filename, returns the name of the file containing
   *  the "white" difference image.
   */
  SkString filename_to_white_filename(const SkString& filename);
  
  /** Calls compute_diff and handles the difference and white diff resources.
   *  If !outputDir.isEmpty(), writes out difference and white images.
   */
  void create_and_write_diff_image(
      DiffRecord* drp, DiffMetricProc dmp, const int colorThreshold, const SkString& outputDir,
      const SkString& filename);
  
  #endif
  