OpenShot Library | libopenshot 0.2.7
Brightness.cpp
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1/**
2 * @file
3 * @brief Source 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#include "Brightness.h"
32#include "Exceptions.h"
33
34using namespace openshot;
35
36/// Blank constructor, useful when using Json to load the effect properties
37Brightness::Brightness() : brightness(0.0), contrast(3.0) {
38 // Init effect properties
39 init_effect_details();
40}
41
42// Default constructor
43Brightness::Brightness(Keyframe new_brightness, Keyframe new_contrast) : brightness(new_brightness), contrast(new_contrast)
44{
45 // Init effect properties
46 init_effect_details();
47}
48
49// Init effect settings
50void Brightness::init_effect_details()
51{
52 /// Initialize the values of the EffectInfo struct.
54
55 /// Set the effect info
56 info.class_name = "Brightness";
57 info.name = "Brightness & Contrast";
58 info.description = "Adjust the brightness and contrast of the frame's image.";
59 info.has_audio = false;
60 info.has_video = true;
61}
62
63// This method is required for all derived classes of EffectBase, and returns a
64// modified openshot::Frame object
65std::shared_ptr<openshot::Frame> Brightness::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
66{
67 // Get the frame's image
68 std::shared_ptr<QImage> frame_image = frame->GetImage();
69
70 // Get keyframe values for this frame
71 float brightness_value = brightness.GetValue(frame_number);
72 float contrast_value = contrast.GetValue(frame_number);
73
74 // Loop through pixels
75 unsigned char *pixels = (unsigned char *) frame_image->bits();
76 int pixel_count = frame_image->width() * frame_image->height();
77
78 #pragma omp parallel for
79 for (int pixel = 0; pixel < pixel_count; ++pixel)
80 {
81 // Compute contrast adjustment factor
82 float factor = (259 * (contrast_value + 255)) / (255 * (259 - contrast_value));
83
84 // Get RGB pixels from image and apply constrained contrast adjustment
85 int R = constrain((factor * (pixels[pixel * 4] - 128)) + 128);
86 int G = constrain((factor * (pixels[pixel * 4 + 1] - 128)) + 128);
87 int B = constrain((factor * (pixels[pixel * 4 + 2] - 128)) + 128);
88 // (Don't modify Alpha value)
89
90 // Adjust brightness and write constrained values back to image
91 pixels[pixel * 4] = constrain(R + (255 * brightness_value));
92 pixels[pixel * 4 + 1] = constrain(G + (255 * brightness_value));
93 pixels[pixel * 4 + 2] = constrain(B + (255 * brightness_value));
94 }
95
96 // return the modified frame
97 return frame;
98}
99
100// Generate JSON string of this object
101std::string Brightness::Json() const {
102
103 // Return formatted string
104 return JsonValue().toStyledString();
105}
106
107// Generate Json::Value for this object
108Json::Value Brightness::JsonValue() const {
109
110 // Create root json object
111 Json::Value root = EffectBase::JsonValue(); // get parent properties
112 root["type"] = info.class_name;
113 root["brightness"] = brightness.JsonValue();
114 root["contrast"] = contrast.JsonValue();
115
116 // return JsonValue
117 return root;
118}
119
120// Load JSON string into this object
121void Brightness::SetJson(const std::string value) {
122
123 // Parse JSON string into JSON objects
124 try
125 {
126 const Json::Value root = openshot::stringToJson(value);
127 // Set all values that match
128 SetJsonValue(root);
129 }
130 catch (const std::exception& e)
131 {
132 // Error parsing JSON (or missing keys)
133 throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
134 }
135}
136
137// Load Json::Value into this object
138void Brightness::SetJsonValue(const Json::Value root) {
139
140 // Set parent data
142
143 // Set data from Json (if key is found)
144 if (!root["brightness"].isNull())
145 brightness.SetJsonValue(root["brightness"]);
146 if (!root["contrast"].isNull())
147 contrast.SetJsonValue(root["contrast"]);
148}
149
150// Get all properties for a specific frame
151std::string Brightness::PropertiesJSON(int64_t requested_frame) const {
152
153 // Generate JSON properties list
154 Json::Value root;
155 root["id"] = add_property_json("ID", 0.0, "string", Id(), NULL, -1, -1, true, requested_frame);
156 root["position"] = add_property_json("Position", Position(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
157 root["layer"] = add_property_json("Track", Layer(), "int", "", NULL, 0, 20, false, requested_frame);
158 root["start"] = add_property_json("Start", Start(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
159 root["end"] = add_property_json("End", End(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
160 root["duration"] = add_property_json("Duration", Duration(), "float", "", NULL, 0, 30 * 60 * 60 * 48, true, requested_frame);
161
162 // Keyframes
163 root["brightness"] = add_property_json("Brightness", brightness.GetValue(requested_frame), "float", "", &brightness, -1.0, 1.0, false, requested_frame);
164 root["contrast"] = add_property_json("Contrast", contrast.GetValue(requested_frame), "float", "", &contrast, 0.0, 100.0, false, requested_frame);
165
166 // Set the parent effect which properties this effect will inherit
167 root["parent_effect_id"] = add_property_json("Parent", 0.0, "string", info.parent_effect_id, NULL, -1, -1, false, requested_frame);
168
169 // Return formatted string
170 return root.toStyledString();
171}
Header file for Brightness class.
Header file for all Exception classes.
Keyframe brightness
Brightness keyframe. A constant value here will prevent animation.
Definition: Brightness.h:59
std::string Json() const override
Generate JSON string of this object.
Definition: Brightness.cpp:101
Keyframe contrast
Contrast keyframe.
Definition: Brightness.h:60
std::shared_ptr< openshot::Frame > GetFrame(int64_t frame_number) override
This method is required for all derived classes of ClipBase, and returns a new openshot::Frame object...
Definition: Brightness.h:78
void SetJsonValue(const Json::Value root) override
Load Json::Value into this object.
Definition: Brightness.cpp:138
Json::Value JsonValue() const override
Generate Json::Value for this object.
Definition: Brightness.cpp:108
std::string PropertiesJSON(int64_t requested_frame) const override
Definition: Brightness.cpp:151
Brightness()
Blank constructor, useful when using Json to load the effect properties.
Definition: Brightness.cpp:37
void SetJson(const std::string value) override
Load JSON string into this object.
Definition: Brightness.cpp:121
float End() const
Get end position (in seconds) of clip (trim end of video)
Definition: ClipBase.h:111
float Start() const
Get start position (in seconds) of clip (trim start of video)
Definition: ClipBase.h:110
float Duration() const
Get the length of this clip (in seconds)
Definition: ClipBase.h:112
std::string Id() const
Get the Id of this clip object.
Definition: ClipBase.h:107
int Layer() const
Get layer of clip on timeline (lower number is covered by higher numbers)
Definition: ClipBase.h:109
float Position() const
Get position on timeline (in seconds)
Definition: ClipBase.h:108
Json::Value add_property_json(std::string name, float value, std::string type, std::string memo, const Keyframe *keyframe, float min_value, float max_value, bool readonly, int64_t requested_frame) const
Generate JSON for a property.
Definition: ClipBase.cpp:68
virtual Json::Value JsonValue() const
Generate Json::Value for this object.
Definition: EffectBase.cpp:92
int constrain(int color_value)
Constrain a color value from 0 to 255.
Definition: EffectBase.cpp:73
virtual void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Definition: EffectBase.cpp:127
EffectInfoStruct info
Information about the current effect.
Definition: EffectBase.h:87
Exception for invalid JSON.
Definition: Exceptions.h:206
A Keyframe is a collection of Point instances, which is used to vary a number or property over time.
Definition: KeyFrame.h:72
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Definition: KeyFrame.cpp:368
double GetValue(int64_t index) const
Get the value at a specific index.
Definition: KeyFrame.cpp:268
Json::Value JsonValue() const
Generate Json::Value for this object.
Definition: KeyFrame.cpp:335
This namespace is the default namespace for all code in the openshot library.
Definition: Compressor.h:47
const Json::Value stringToJson(const std::string value)
Definition: Json.cpp:34
bool has_video
Determines if this effect manipulates the image of a frame.
Definition: EffectBase.h:58
std::string parent_effect_id
Id of the parent effect (if there is one)
Definition: EffectBase.h:57
bool has_audio
Determines if this effect manipulates the audio of a frame.
Definition: EffectBase.h:59
std::string class_name
The class name of the effect.
Definition: EffectBase.h:54
std::string name
The name of the effect.
Definition: EffectBase.h:55
std::string description
The description of this effect and what it does.
Definition: EffectBase.h:56