OpenShot Library | libopenshot  0.2.7
Color.cpp
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1 /**
2  * @file
3  * @brief Source file for EffectBase 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 "Color.h"
32 #include "Exceptions.h"
33 
34 using namespace openshot;
35 
36 // Constructor which takes R,G,B,A
37 Color::Color(unsigned char Red, unsigned char Green, unsigned char Blue, unsigned char Alpha)
38 {
39  // Set initial points
40  red.AddPoint(1, (float)Red);
41  green.AddPoint(1, (float)Green);
42  blue.AddPoint(1, (float)Blue);
43  alpha.AddPoint(1, (float)Alpha);
44 }
45 
46 // Constructor which takes 4 existing Keyframe curves
48 {
49  // Assign existing keyframes
50  red = Red;
51  green = Green;
52  blue = Blue;
53  alpha = Alpha;
54 }
55 
56 // Constructor which takes a HEX color code
57 Color::Color(std::string color_hex)
58 {
59  // Create a QColor from hex
60  QColor color(QString::fromStdString(color_hex));
61  red.AddPoint(1, color.red());
62  green.AddPoint(1, color.green());
63  blue.AddPoint(1, color.blue());
64  alpha.AddPoint(1, color.alpha());
65 }
66 
67 // Get the HEX value of a color at a specific frame
68 std::string Color::GetColorHex(int64_t frame_number) {
69 
70  int r = red.GetInt(frame_number);
71  int g = green.GetInt(frame_number);
72  int b = blue.GetInt(frame_number);
73  int a = alpha.GetInt(frame_number);
74 
75  return QColor( r,g,b,a ).name().toStdString();
76 }
77 
78 // Get the RGBA values of a color at a specific frame
79 std::vector<int> Color::GetColorRGBA(int64_t frame_number) {
80  std::vector<int> rgba;
81  rgba.push_back(red.GetInt(frame_number));
82  rgba.push_back(green.GetInt(frame_number));
83  rgba.push_back(blue.GetInt(frame_number));
84  rgba.push_back(alpha.GetInt(frame_number));
85 
86  return rgba;
87 }
88 
89 // Get the distance between 2 RGB pairs (alpha is ignored)
90 long Color::GetDistance(long R1, long G1, long B1, long R2, long G2, long B2)
91 {
92  long rmean = ( R1 + R2 ) / 2;
93  long r = R1 - R2;
94  long g = G1 - G2;
95  long b = B1 - B2;
96  return sqrt((((512+rmean)*r*r)>>8) + 4*g*g + (((767-rmean)*b*b)>>8));
97 }
98 
99 // Generate JSON string of this object
100 std::string Color::Json() const {
101 
102  // Return formatted string
103  return JsonValue().toStyledString();
104 }
105 
106 // Generate Json::Value for this object
107 Json::Value Color::JsonValue() const {
108 
109  // Create root json object
110  Json::Value root;
111  root["red"] = red.JsonValue();
112  root["green"] = green.JsonValue();
113  root["blue"] = blue.JsonValue();
114  root["alpha"] = alpha.JsonValue();
115 
116  // return JsonValue
117  return root;
118 }
119 
120 // Load JSON string into this object
121 void Color::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
138 void Color::SetJsonValue(const Json::Value root) {
139 
140  // Set data from Json (if key is found)
141  if (!root["red"].isNull())
142  red.SetJsonValue(root["red"]);
143  if (!root["green"].isNull())
144  green.SetJsonValue(root["green"]);
145  if (!root["blue"].isNull())
146  blue.SetJsonValue(root["blue"]);
147  if (!root["alpha"].isNull())
148  alpha.SetJsonValue(root["alpha"]);
149 }
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Definition: Color.cpp:138
Color()
Default constructor.
Definition: Color.h:54
std::string Json() const
Generate JSON string of this object.
Definition: Color.cpp:100
const Json::Value stringToJson(const std::string value)
Definition: Json.cpp:34
int GetInt(int64_t index) const
Get the rounded INT value at a specific index.
Definition: KeyFrame.cpp:292
openshot::Keyframe blue
Curve representing the red value (0 - 255)
Definition: Color.h:50
void AddPoint(Point p)
Add a new point on the key-frame. Each point has a primary coordinate, a left handle, and a right handle.
Definition: KeyFrame.cpp:141
static long GetDistance(long R1, long G1, long B1, long R2, long G2, long B2)
Get the distance between 2 RGB pairs. (0=identical colors, 10=very close colors, 760=very different c...
Definition: Color.cpp:90
Header file for all Exception classes.
openshot::Keyframe green
Curve representing the green value (0 - 255)
Definition: Color.h:49
std::string GetColorHex(int64_t frame_number)
Get the HEX value of a color at a specific frame.
Definition: Color.cpp:68
void SetJson(const std::string value)
Load JSON string into this object.
Definition: Color.cpp:121
Header file for Color class.
void SetJsonValue(const Json::Value root)
Load Json::Value into this object.
Definition: KeyFrame.cpp:368
This namespace is the default namespace for all code in the openshot library.
Definition: Compressor.h:46
Json::Value JsonValue() const
Generate Json::Value for this object.
Definition: KeyFrame.cpp:335
std::vector< int > GetColorRGBA(int64_t frame_number)
Definition: Color.cpp:79
Exception for invalid JSON.
Definition: Exceptions.h:205
openshot::Keyframe red
Curve representing the red value (0 - 255)
Definition: Color.h:48
openshot::Keyframe alpha
Curve representing the alpha value (0 - 255)
Definition: Color.h:51
A Keyframe is a collection of Point instances, which is used to vary a number or property over time...
Definition: KeyFrame.h:72
Json::Value JsonValue() const
Generate Json::Value for this object.
Definition: Color.cpp:107