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Saturation.cpp
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Saturation.cpp
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/**
* @file
* @brief Source file for Saturation class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../../include/effects/Saturation.h"
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Saturation::Saturation() : saturation(1.0), saturation_R(1.0), saturation_G(1.0), saturation_B(1.0) {
// Init effect properties
init_effect_details();
}
// Default constructor
Saturation::Saturation(Keyframe saturation, Keyframe saturation_R, Keyframe saturation_G, Keyframe saturation_B) :
saturation(saturation), saturation_R(saturation_R), saturation_G(saturation_G), saturation_B(saturation_B)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Saturation::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Saturation";
info.name = "Color Saturation";
info.description = "Adjust the color saturation.";
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<Frame> Saturation::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get the frame's image
std::shared_ptr<QImage> frame_image = frame->GetImage();
if (!frame_image)
return frame;
// Get keyframe values for this frame
float saturation_value = saturation.GetValue(frame_number);
float saturation_value_R = saturation_R.GetValue(frame_number);
float saturation_value_G = saturation_G.GetValue(frame_number);
float saturation_value_B = saturation_B.GetValue(frame_number);
// Constants used for color saturation formula
double pR = .299;
double pG = .587;
double pB = .114;
// Loop through pixels
unsigned char *pixels = (unsigned char *) frame_image->bits();
for (int pixel = 0, byte_index=0; pixel < frame_image->width() * frame_image->height(); pixel++, byte_index+=4)
{
// Get the RGB values from the pixel
int R = pixels[byte_index];
int G = pixels[byte_index + 1];
int B = pixels[byte_index + 2];
int A = pixels[byte_index + 3];
/*
* Common saturation adjustment
*/
// Calculate the saturation multiplier
double p = sqrt( (R * R * pR) +
(G * G * pG) +
(B * B * pB) );
// Adjust the saturation
R = p + (R - p) * saturation_value;
G = p + (G - p) * saturation_value;
B = p + (B - p) * saturation_value;
// Constrain the value from 0 to 255
R = constrain(R);
G = constrain(G);
B = constrain(B);
/*
* Color-separated saturation adjustment
*
* Splitting each of the three subpixels (R, G and B) into three distincs sub-subpixels (R, G and B in turn)
* which in their optical sum reproduce the original subpixel's color OR produce white light in the brightness
* of the original subpixel (dependening on the color channel's slider value).
*/
// Compute the brightness ("saturation multiplier") of the replaced subpixels
// Actually mathematical no-ops mostly, verbosity is kept just for clarification
const double p_r = sqrt(R * R * pR);
const double p_g = sqrt(G * G * pG);
const double p_b = sqrt(B * B * pB);
// Adjust the saturation
const int Rr = p_r + (R - p_r) * saturation_value_R;
const int Gr = p_r + (0 - p_r) * saturation_value_R;
const int Br = p_r + (0 - p_r) * saturation_value_R;
const int Rg = p_g + (0 - p_g) * saturation_value_G;
const int Gg = p_g + (G - p_g) * saturation_value_G;
const int Bg = p_g + (0 - p_g) * saturation_value_G;
const int Rb = p_b + (0 - p_b) * saturation_value_B;
const int Gb = p_b + (0 - p_b) * saturation_value_B;
const int Bb = p_b + (B - p_b) * saturation_value_B;
// Recombine brightness of sub-subpixels (Rx, Gx and Bx) into sub-pixels (R, G and B) again
R = Rr + Rg + Rb;
G = Gr + Gg + Gb;
B = Br + Bg + Bb;
// Constrain the value from 0 to 255
R = constrain(R);
G = constrain(G);
B = constrain(B);
// Set all pixels to new value
pixels[byte_index] = R;
pixels[byte_index + 1] = G;
pixels[byte_index + 2] = B;
pixels[byte_index + 3] = A; // leave the alpha value alone
}
// return the modified frame
return frame;
}
// Generate JSON string of this object
std::string Saturation::Json() {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::JsonValue for this object
Json::Value Saturation::JsonValue() {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
root["saturation"] = saturation.JsonValue();
root["saturation_R"] = saturation_R.JsonValue();
root["saturation_G"] = saturation_G.JsonValue();
root["saturation_B"] = saturation_B.JsonValue();
// return JsonValue
return root;
}
// Load JSON string into this object
void Saturation::SetJson(std::string value) {
// Parse JSON string into JSON objects
Json::Value root;
Json::CharReaderBuilder rbuilder;
Json::CharReader* reader(rbuilder.newCharReader());
std::string errors;
bool success = reader->parse( value.c_str(),
value.c_str() + value.size(), &root, &errors );
delete reader;
if (!success)
// Raise exception
throw InvalidJSON("JSON could not be parsed (or is invalid)");
try
{
// 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::JsonValue into this object
void Saturation::SetJsonValue(Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["saturation"].isNull())
saturation.SetJsonValue(root["saturation"]);
if (!root["saturation_R"].isNull())
saturation_R.SetJsonValue(root["saturation_R"]);
if (!root["saturation_G"].isNull())
saturation_G.SetJsonValue(root["saturation_G"]);
if (!root["saturation_B"].isNull())
saturation_B.SetJsonValue(root["saturation_B"]);
}
// Get all properties for a specific frame
std::string Saturation::PropertiesJSON(int64_t requested_frame) {
// Generate JSON properties list
Json::Value root;
root["id"] = add_property_json("ID", 0.0, "string", Id(), NULL, -1, -1, true, requested_frame);
root["position"] = add_property_json("Position", Position(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
root["layer"] = add_property_json("Track", Layer(), "int", "", NULL, 0, 20, false, requested_frame);
root["start"] = add_property_json("Start", Start(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
root["end"] = add_property_json("End", End(), "float", "", NULL, 0, 30 * 60 * 60 * 48, false, requested_frame);
root["duration"] = add_property_json("Duration", Duration(), "float", "", NULL, 0, 30 * 60 * 60 * 48, true, requested_frame);
// Keyframes
root["saturation"] = add_property_json("Saturation", saturation.GetValue(requested_frame), "float", "", &saturation, 0.0, 4.0, false, requested_frame);
root["saturation_R"] = add_property_json("Saturation (Red)", saturation_R.GetValue(requested_frame), "float", "", &saturation_R, 0.0, 4.0, false, requested_frame);
root["saturation_G"] = add_property_json("Saturation (Green)", saturation_G.GetValue(requested_frame), "float", "", &saturation_G, 0.0, 4.0, false, requested_frame);
root["saturation_B"] = add_property_json("Saturation (Blue)", saturation_B.GetValue(requested_frame), "float", "", &saturation_B, 0.0, 4.0, false, requested_frame);
// Return formatted string
return root.toStyledString();
}