OpenShot Library | libopenshot  0.2.2
Brightness.h
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1 /**
2  * @file
3  * @brief Header file for Brightness class
4  * @author Jonathan Thomas <jonathan@openshot.org>
5  *
6  * @section LICENSE
7  *
8  * Copyright (c) 2008-2014 OpenShot Studios, LLC
9  * <http://www.openshotstudios.com/>. This file is part of
10  * OpenShot Library (libopenshot), an open-source project dedicated to
11  * delivering high quality video editing and animation solutions to the
12  * world. For more information visit <http://www.openshot.org/>.
13  *
14  * OpenShot Library (libopenshot) is free software: you can redistribute it
15  * and/or modify it under the terms of the GNU Lesser General Public License
16  * as published by the Free Software Foundation, either version 3 of the
17  * License, or (at your option) any later version.
18  *
19  * OpenShot Library (libopenshot) is distributed in the hope that it will be
20  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22  * GNU Lesser General Public License for more details.
23  *
24  * You should have received a copy of the GNU Lesser General Public License
25  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
26  */
27 
28 #ifndef OPENSHOT_BRIGHTNESS_EFFECT_H
29 #define OPENSHOT_BRIGHTNESS_EFFECT_H
30 
31 #include "../EffectBase.h"
32 
33 #include <cmath>
34 #include <ctime>
35 #include <iostream>
36 #include <omp.h>
37 #include <stdio.h>
38 #include <memory>
39 #include "../Color.h"
40 #include "../Exceptions.h"
41 #include "../Json.h"
42 #include "../KeyFrame.h"
43 #include "../ReaderBase.h"
44 #include "../FFmpegReader.h"
45 #include "../QtImageReader.h"
46 #include "../ChunkReader.h"
47 
48 using namespace std;
49 
50 namespace openshot
51 {
52 
53  /**
54  * @brief This class adjusts the brightness and contrast of an image, and can be animated
55  * with openshot::Keyframe curves over time.
56  *
57  * Adjusting the brightness and contrast over time can create many different powerful effects.
58  */
59  class Brightness : public EffectBase
60  {
61  private:
62  /// Init effect settings
63  void init_effect_details();
64 
65  public:
66  Keyframe brightness; ///< Brightness keyframe. A constant value here will prevent animation.
67  Keyframe contrast; ///< Contrast keyframe.
68 
69  /// Blank constructor, useful when using Json to load the effect properties
70  Brightness();
71 
72  /// Default constructor, which takes 2 curves. The curves adjust the brightness and
73  // contrast of a frame's image.
74  ///
75  /// @param new_brightness The curve to adjust the brightness (between 100 and -100)
76  /// @param new_contrast The curve to adjust the contrast (3 is typical, 20 is a lot, 0 is invalid)
77  Brightness(Keyframe new_brightness, Keyframe new_contrast);
78 
79  /// @brief This method is required for all derived classes of EffectBase, and returns a
80  /// modified openshot::Frame object
81  ///
82  /// The frame object is passed into this method, and a frame_number is passed in which
83  /// tells the effect which settings to use from it's keyframes (starting at 1).
84  ///
85  /// @returns The modified openshot::Frame object
86  /// @param frame The frame object that needs the effect applied to it
87  /// @param frame_number The frame number (starting at 1) of the effect on the timeline.
88  std::shared_ptr<Frame> GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number);
89 
90  /// Get and Set JSON methods
91  string Json(); ///< Generate JSON string of this object
92  void SetJson(string value); ///< Load JSON string into this object
93  Json::Value JsonValue(); ///< Generate Json::JsonValue for this object
94  void SetJsonValue(Json::Value root); ///< Load Json::JsonValue into this object
95 
96  /// Get all properties for a specific frame (perfect for a UI to display the current state
97  /// of all properties at any time)
98  string PropertiesJSON(int64_t requested_frame);
99  };
100 
101 }
102 
103 #endif
This abstract class is the base class, used by all effects in libopenshot.
Definition: EffectBase.h:66
Keyframe contrast
Contrast keyframe.
Definition: Brightness.h:67
Keyframe brightness
Brightness keyframe. A constant value here will prevent animation.
Definition: Brightness.h:66
This class adjusts the brightness and contrast of an image, and can be animated with openshot::Keyfra...
Definition: Brightness.h:59
A Keyframe is a collection of Point instances, which is used to vary a number or property over time...
Definition: KeyFrame.h:64