Color.cpp

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#include <utility>
#include <cmath>
 
#include "Color.h"
#include "Exceptions.h"
 
using namespace openshot;
 
// Constructor which takes R,G,B,A
Color::Color(unsigned char Red, unsigned char Green, unsigned char Blue, unsigned char Alpha) :
    red(static_cast<double>(Red)),
    green(static_cast<double>(Green)),
    blue(static_cast<double>(Blue)),
    alpha(static_cast<double>(Alpha)) { }
 
// Constructor which takes 4 existing Keyframe curves
Color::Color(Keyframe Red, Keyframe Green, Keyframe Blue, Keyframe Alpha) :
    red(Red), green(Green), blue(Blue), alpha(Alpha) { }
 
// Constructor which takes a QColor
Color::Color(QColor qcolor) :
    red(qcolor.red()),
    green(qcolor.green()),
    blue(qcolor.blue()),
    alpha(qcolor.alpha()) { }
 
 
// Constructor which takes a HEX color code
Color::Color(std::string color_hex)
    : Color::Color(QString::fromStdString(color_hex)) {}
 
Color::Color(const char* color_hex)
    : Color::Color(QString(color_hex)) {}
 
// Get the HEX value of a color at a specific frame
std::string Color::GetColorHex(int64_t frame_number) {
 
    int r = red.GetInt(frame_number);
    int g = green.GetInt(frame_number);
    int b = blue.GetInt(frame_number);
    int a = alpha.GetInt(frame_number);
 
    return QColor( r,g,b,a ).name().toStdString();
}
 
// Get RGBA values for a specific frame as an integer vector
std::vector<int> Color::GetColorRGBA(int64_t frame_number) {
    std::vector<int> rgba;
    rgba.push_back(red.GetInt(frame_number));
    rgba.push_back(green.GetInt(frame_number));
    rgba.push_back(blue.GetInt(frame_number));
    rgba.push_back(alpha.GetInt(frame_number));
 
    return rgba;
}
 
// Get the distance between 2 RGB pairs (alpha is ignored)
long Color::GetDistance(long R1, long G1, long B1, long R2, long G2, long B2)
{
      long rmean = ( R1 + R2 ) / 2;
      long r = R1 - R2;
      long g = G1 - G2;
      long b = B1 - B2;
      return sqrt((((512+rmean)*r*r)>>8) + 4*g*g + (((767-rmean)*b*b)>>8));
}
 
// Generate JSON string of this object
std::string Color::Json() const {
 
    // Return formatted string
    return JsonValue().toStyledString();
}
 
// Generate Json::Value for this object
Json::Value Color::JsonValue() const {
 
    // Create root json object
    Json::Value root;
    root["red"] = red.JsonValue();
    root["green"] = green.JsonValue();
    root["blue"] = blue.JsonValue();
    root["alpha"] = alpha.JsonValue();
 
    // return JsonValue
    return root;
}
 
// Load JSON string into this object
void Color::SetJson(const std::string value) {
 
    // Parse JSON string into JSON objects
    try
    {
        Json::Value root = openshot::stringToJson(value);
        // Set all values that match
        SetJsonValue(std::move(root));
    }
    catch (const std::exception& e)
    {
        // Error parsing JSON (or missing keys)
        throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
    }
}
 
// Load Json::Value into this object
void Color::SetJsonValue(Json::Value root) {
 
    // Set data from Json (if key is found)
    if (!root["red"].isNull())
        red.SetJsonValue(std::move(root["red"]));
    if (!root["green"].isNull())
        green.SetJsonValue(std::move(root["green"]));
    if (!root["blue"].isNull())
        blue.SetJsonValue(std::move(root["blue"]));
    if (!root["alpha"].isNull())
        alpha.SetJsonValue(std::move(root["alpha"]));
}