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Pixelate.cpp
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Pixelate.cpp
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/**
* @file
* @brief Source file for Pixelate effect 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/Pixelate.h"
#include "Json.h"
#include <QImage>
#include <QPainter>
#include <QRect>
#include <QPoint>
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Pixelate::Pixelate() : pixelization(0.7), left(0.0), top(0.0), right(0.0), bottom(0.0) {
// Init effect properties
init_effect_details();
}
// Default constructor
Pixelate::Pixelate(Keyframe pixelization, Keyframe left, Keyframe top, Keyframe right, Keyframe bottom) :
pixelization(pixelization), left(left), top(top), right(right), bottom(bottom)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Pixelate::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Pixelate";
info.name = "Pixelate";
info.description = "Pixelate (increase or decrease) the number of visible pixels.";
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> Pixelate::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get the frame's image
std::shared_ptr<QImage> frame_image = frame->GetImage();
// Get current keyframe values
double pixelization_value = 1.0 - std::min(fabs(pixelization.GetValue(frame_number)), 1.0);
double left_value = left.GetValue(frame_number);
double top_value = top.GetValue(frame_number);
double right_value = right.GetValue(frame_number);
double bottom_value = bottom.GetValue(frame_number);
if (pixelization_value > 0.0) {
int w = frame_image->width();
int h = frame_image->height();
// Define area we're working on in terms of a QRect with QMargins applied
QRect area(QPoint(0,0), frame_image->size());
area = area.marginsRemoved({int(left_value * w), int(top_value * h), int(right_value * w), int(bottom_value * h)});
// Copy and scale pixels in area to be pixelated
auto frame_scaled = frame_image->copy(area).scaledToWidth(area.width() * pixelization_value, Qt::SmoothTransformation);
// Draw pixelated image back over original
QPainter painter(frame_image.get());
painter.drawImage(area, frame_scaled);
painter.end();
}
// return the modified frame
return frame;
}
// Generate JSON string of this object
std::string Pixelate::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Pixelate::JsonValue() const {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
root["pixelization"] = pixelization.JsonValue();
root["left"] = left.JsonValue();
root["top"] = top.JsonValue();
root["right"] = right.JsonValue();
root["bottom"] = bottom.JsonValue();
// return JsonValue
return root;
}
// Load JSON string into this object
void Pixelate::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 Pixelate::SetJsonValue(const Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["pixelization"].isNull())
pixelization.SetJsonValue(root["pixelization"]);
if (!root["left"].isNull())
left.SetJsonValue(root["left"]);
if (!root["top"].isNull())
top.SetJsonValue(root["top"]);
if (!root["right"].isNull())
right.SetJsonValue(root["right"]);
if (!root["bottom"].isNull())
bottom.SetJsonValue(root["bottom"]);
}
// Get all properties for a specific frame
std::string Pixelate::PropertiesJSON(int64_t requested_frame) const {
// 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, 1000 * 60 * 30, 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, 1000 * 60 * 30, false, requested_frame);
root["end"] = add_property_json("End", End(), "float", "", NULL, 0, 1000 * 60 * 30, false, requested_frame);
root["duration"] = add_property_json("Duration", Duration(), "float", "", NULL, 0, 1000 * 60 * 30, true, requested_frame);
// Keyframes
root["pixelization"] = add_property_json("Pixelization", pixelization.GetValue(requested_frame), "float", "", &pixelization, 0.0, 0.9999, false, requested_frame);
root["left"] = add_property_json("Left Margin", left.GetValue(requested_frame), "float", "", &left, 0.0, 1.0, false, requested_frame);
root["top"] = add_property_json("Top Margin", top.GetValue(requested_frame), "float", "", &top, 0.0, 1.0, false, requested_frame);
root["right"] = add_property_json("Right Margin", right.GetValue(requested_frame), "float", "", &right, 0.0, 1.0, false, requested_frame);
root["bottom"] = add_property_json("Bottom Margin", bottom.GetValue(requested_frame), "float", "", &bottom, 0.0, 1.0, false, requested_frame);
// Return formatted string
return root.toStyledString();
}