Negate.cpp

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#include "Negate.h"
#include "Exceptions.h"
 
using namespace openshot;
 
// Default constructor
Negate::Negate()
{
    InitEffectInfo();
 
    info.class_name = "Negate";
    info.name = "Negative";
    info.description = "Negates the colors, producing a negative of the image.";
    info.has_audio = false;
    info.has_video = true;
}
 
// This method is required for all derived classes of EffectBase, and returns a
// modified openshot::Frame object
std::shared_ptr<openshot::Frame> Negate::GetFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number)
{
    // Make a negative of the images pixels
    frame->GetImage()->invertPixels();
 
    // return the modified frame
    return frame;
}
 
// Generate JSON string of this object
std::string Negate::Json() const {
 
    // Return formatted string
    return JsonValue().toStyledString();
}
 
// Generate Json::Value for this object
Json::Value Negate::JsonValue() const {
 
    // Create root json object
    Json::Value root = EffectBase::JsonValue(); // get parent properties
    root["type"] = info.class_name;
 
    // return JsonValue
    return root;
}
 
// Load JSON string into this object
void Negate::SetJson(const std::string value) {
 
    // Parse JSON string into JSON objects
    try
    {
        const Json::Value root = openshot::stringToJson(value);
        // Set all values that match
        SetJsonValue(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 Negate::SetJsonValue(const Json::Value root) {
 
    // Set parent data
    EffectBase::SetJsonValue(root);
 
}
 
// Get all properties for a specific frame
std::string Negate::PropertiesJSON(int64_t requested_frame) const {
 
    // Generate JSON properties list
    Json::Value root = BasePropertiesJSON(requested_frame);
 
    // Return formatted string
    return root.toStyledString();
}