OpenShot Library | libopenshot  0.2.4
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  * @ref License
7  */
8 
9 /* LICENSE
10  *
11  * Copyright (c) 2008-2019 OpenShot Studios, LLC
12  * <http://www.openshotstudios.com/>. This file is part of
13  * OpenShot Library (libopenshot), an open-source project dedicated to
14  * delivering high quality video editing and animation solutions to the
15  * world. For more information visit <http://www.openshot.org/>.
16  *
17  * OpenShot Library (libopenshot) is free software: you can redistribute it
18  * and/or modify it under the terms of the GNU Lesser General Public License
19  * as published by the Free Software Foundation, either version 3 of the
20  * License, or (at your option) any later version.
21  *
22  * OpenShot Library (libopenshot) is distributed in the hope that it will be
23  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25  * GNU Lesser General Public License for more details.
26  *
27  * You should have received a copy of the GNU Lesser General Public License
28  * along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
29  */
30 
31 #ifndef OPENSHOT_BRIGHTNESS_EFFECT_H
32 #define OPENSHOT_BRIGHTNESS_EFFECT_H
33 
34 #include "../EffectBase.h"
35 
36 #include <cmath>
37 #include <ctime>
38 #include <iostream>
39 #include <omp.h>
40 #include <stdio.h>
41 #include <memory>
42 #include "../Color.h"
43 #include "../Exceptions.h"
44 #include "../Json.h"
45 #include "../KeyFrame.h"
46 #include "../ReaderBase.h"
47 #include "../FFmpegReader.h"
48 #include "../QtImageReader.h"
49 #include "../ChunkReader.h"
50 
51 namespace openshot
52 {
53 
54  /**
55  * @brief This class adjusts the brightness and contrast of an image, and can be animated
56  * with openshot::Keyframe curves over time.
57  *
58  * Adjusting the brightness and contrast over time can create many different powerful effects.
59  */
60  class Brightness : public EffectBase
61  {
62  private:
63  /// Init effect settings
64  void init_effect_details();
65 
66  public:
67  Keyframe brightness; ///< Brightness keyframe. A constant value here will prevent animation.
68  Keyframe contrast; ///< Contrast keyframe.
69 
70  /// Blank constructor, useful when using Json to load the effect properties
71  Brightness();
72 
73  /// Default constructor, which takes 2 curves. The curves adjust the brightness and
74  // contrast of a frame's image.
75  ///
76  /// @param new_brightness The curve to adjust the brightness (from -1 to +1, 0 is default/"off")
77  /// @param new_contrast The curve to adjust the contrast (3 is typical, 20 is a lot, 100 is max. 0 is invalid)
78  Brightness(Keyframe new_brightness, Keyframe new_contrast);
79 
80  /// @brief This method is required for all derived classes of EffectBase, and returns a
81  /// modified openshot::Frame object
82  ///
83  /// The frame object is passed into this method, and a frame_number is passed in which
84  /// tells the effect which settings to use from its keyframes (starting at 1).
85  ///
86  /// @returns The modified openshot::Frame object
87  /// @param frame The frame object that needs the effect applied to it
88  /// @param frame_number The frame number (starting at 1) of the effect on the timeline.
89  std::shared_ptr<Frame> GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number);
90 
91  /// Get and Set JSON methods
92  std::string Json(); ///< Generate JSON string of this object
93  void SetJson(std::string value); ///< Load JSON string into this object
94  Json::Value JsonValue(); ///< Generate Json::JsonValue for this object
95  void SetJsonValue(Json::Value root); ///< Load Json::JsonValue into this object
96 
97  /// Get all properties for a specific frame (perfect for a UI to display the current state
98  /// of all properties at any time)
99  std::string PropertiesJSON(int64_t requested_frame);
100  };
101 
102 }
103 
104 #endif
This abstract class is the base class, used by all effects in libopenshot.
Definition: EffectBase.h:66
Brightness()
Blank constructor, useful when using Json to load the effect properties.
Definition: Brightness.cpp:36
void SetJsonValue(Json::Value root)
Load Json::JsonValue into this object.
Definition: Brightness.cpp:160
Keyframe contrast
Contrast keyframe.
Definition: Brightness.h:68
std::string PropertiesJSON(int64_t requested_frame)
Definition: Brightness.cpp:173
Keyframe brightness
Brightness keyframe. A constant value here will prevent animation.
Definition: Brightness.h:67
This class adjusts the brightness and contrast of an image, and can be animated with openshot::Keyfra...
Definition: Brightness.h:60
void SetJson(std::string value)
Load JSON string into this object.
Definition: Brightness.cpp:131
std::shared_ptr< Frame > GetFrame(std::shared_ptr< Frame > frame, int64_t frame_number)
This method is required for all derived classes of EffectBase, and returns a modified openshot::Frame...
Definition: Brightness.cpp:64
This namespace is the default namespace for all code in the openshot library.
std::string Json()
Get and Set JSON methods.
Definition: Brightness.cpp:111
A Keyframe is a collection of Point instances, which is used to vary a number or property over time...
Definition: KeyFrame.h:64
Json::Value JsonValue()
Generate Json::JsonValue for this object.
Definition: Brightness.cpp:118