1 /*
2  * Copyright 2012 Google Inc.
3  *
4  * Use of this source code is governed by a BSD-style license that can be
5  * found in the LICENSE file.
6  */
7 
8 #ifndef skdiff_utils_DEFINED
9 #define skdiff_utils_DEFINED
10 
11 #include "skdiff.h"
12 #include "SkImageDecoder.h"
13 
14 class SkBitmap;
15 class SkData;
16 class SkString;
17 
18 /** Returns true if the two buffers passed in are both non-nullptr,
19  *  have the same length, and contain exactly the same byte values.
20  */
21 bool are_buffers_equal(SkData* skdata1, SkData* skdata2);
22 
23 /** Reads the file at the given path and returns its complete contents as an
24  *  SkData object (or returns nullptr on error).
25  */
26 SkData* read_file(const char* file_path);
27 
28 /** Decodes the fileBits into the resource.fBitmap. Returns false on failure. */
29 bool get_bitmap(SkData* fileBits, DiffResource& resource, SkImageDecoder::Mode mode);
30 
31 /** Writes the bitmap as a PNG to the path specified. */
32 bool write_bitmap(const SkString& path, const SkBitmap& bitmap);
33 
34 /** Given an image filename, returns the name of the file containing
35  *  the associated difference image.
36  */
37 SkString filename_to_diff_filename(const SkString& filename);
38 
39 /** Given an image filename, returns the name of the file containing
40  *  the "white" difference image.
41  */
42 SkString filename_to_white_filename(const SkString& filename);
43 
44 /** Calls compute_diff and handles the difference and white diff resources.
45  *  If !outputDir.isEmpty(), writes out difference and white images.
46  */
47 void create_and_write_diff_image(DiffRecord* drp,
48                                  DiffMetricProc dmp,
49                                  const int colorThreshold,
50                                  const SkString& outputDir,
51                                  const SkString& filename);
52 
53 #endif
54