1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTER_H_
6 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTER_H_
10 #include "base/base_export.h"
11 #include "base/bind_internal.h"
12 #include "base/files/file_path.h"
13 #include "base/macros.h"
14 #include "base/memory/ref_counted_memory.h"
15 #include "base/memory/weak_ptr.h"
16 #include "base/run_loop.h"
20 // A class that allows taking, saving and comparing screnshots while
22 class ScreenshotTester {
25 virtual ~ScreenshotTester();
27 // Returns true if the screenshots should be taken and will be taken,
28 // false otherwise. Also gets all the information from the command line
32 // Does all the work that has been stated through switches:
33 // updates golden screenshot or takes a new screenshot and compares it
34 // with the golden one. |test_name| is the name of the test from which
35 // we run this method.
36 void Run(const std::string& test_name);
39 typedef scoped_refptr<base::RefCountedBytes> PNGFile;
41 // Takes a screenshot and returns it.
42 PNGFile TakeScreenshot();
44 // Saves |png_data| as a new golden screenshot for test |test_name_|.
45 void UpdateGoldenScreenshot(PNGFile png_data);
47 // Saves an image |png_data|, assuming it is a .png file.
48 // Returns true if image was saved successfully.
49 bool SaveImage(const std::string& file_name,
50 const base::FilePath& screenshot_dir,
53 // Saves |png_data| as a current screenshot.
54 void ReturnScreenshot(const PNGFile& screenshot, PNGFile png_data);
56 // Loads golden screenshot from the disk. Fails if there is no
57 // golden screenshot for test |test_name_|.
58 PNGFile LoadGoldenScreenshot();
60 // Compares two given screenshots and saves |sample|
61 // and difference between |sample| and |model|, if they differ in any pixel.
62 void CompareScreenshots(PNGFile model, PNGFile sample);
64 // Name of the test from which Run() method has been called.
65 // Used for generating names for screenshot files.
66 std::string test_name_;
68 // Path to the directory for golden screenshots.
69 base::FilePath golden_screenshots_dir_;
71 // Path to the directory where screenshots that failed comparing
72 // and difference between them and golden ones will be stored.
73 base::FilePath artifacts_dir_;
75 // |run_loop_| and |run_loop_quitter_| are used to synchronize
76 // with ui::GrabWindowSnapshotAsync.
77 base::RunLoop run_loop_;
78 base::Closure run_loop_quitter_;
80 // Is true when we're in test mode:
81 // comparing golden screenshots and current ones.
84 base::WeakPtrFactory<ScreenshotTester> weak_factory_;
86 DISALLOW_COPY_AND_ASSIGN(ScreenshotTester);
89 } // namespace chromeos
91 #endif // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENSHOT_TESTER_H_