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Blur.cpp
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Blur.cpp
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/**
* @file
* @brief Source file for Blur 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/Blur.h"
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Blur::Blur() : horizontal_radius(6.0), vertical_radius(6.0), sigma(3.0), iterations(3.0) {
// Init effect properties
init_effect_details();
}
// Default constructor
Blur::Blur(Keyframe new_horizontal_radius, Keyframe new_vertical_radius, Keyframe new_sigma, Keyframe new_iterations) :
horizontal_radius(new_horizontal_radius), vertical_radius(new_vertical_radius),
sigma(new_sigma), iterations(new_iterations)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Blur::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Blur";
info.name = "Blur";
info.description = "Adjust the blur of the frame's 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<Frame> Blur::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get the frame's image
std::shared_ptr<QImage> frame_image = frame->GetImage();
// Get the current blur radius
int horizontal_radius_value = horizontal_radius.GetValue(frame_number);
int vertical_radius_value = vertical_radius.GetValue(frame_number);
float sigma_value = sigma.GetValue(frame_number);
int iteration_value = iterations.GetInt(frame_number);
int w = frame_image->width();
int h = frame_image->height();
// Grab two copies of the image pixel data
QImage image_copy = frame_image->copy();
std::shared_ptr<QImage> frame_image_2 = std::make_shared<QImage>(image_copy);
// Loop through each iteration
for (int iteration = 0; iteration < iteration_value; ++iteration)
{
// HORIZONTAL BLUR (if any)
if (horizontal_radius_value > 0.0) {
// Apply horizontal blur to target RGBA channels
boxBlurH(frame_image->bits(), frame_image_2->bits(), w, h, horizontal_radius_value);
// Swap output image back to input
frame_image.swap(frame_image_2);
}
// VERTICAL BLUR (if any)
if (vertical_radius_value > 0.0) {
// Apply vertical blur to target RGBA channels
boxBlurT(frame_image->bits(), frame_image_2->bits(), w, h, vertical_radius_value);
// Swap output image back to input
frame_image.swap(frame_image_2);
}
}
// return the modified frame
return frame;
}
// Credit: http://blog.ivank.net/fastest-gaussian-blur.html (MIT License)
// Modified to process all four channels in a pixel array
void Blur::boxBlurH(unsigned char *scl, unsigned char *tcl, int w, int h, int r) {
float iarr = 1.0 / (r + r + 1);
#pragma omp parallel for shared (scl, tcl)
for (int i = 0; i < h; ++i) {
for (int ch = 0; ch < 4; ++ch) {
int ti = i * w, li = ti, ri = ti + r;
int fv = scl[ti * 4 + ch], lv = scl[(ti + w - 1) * 4 + ch], val = (r + 1) * fv;
for (int j = 0; j < r; ++j) {
val += scl[(ti + j) * 4 + ch];
}
for (int j = 0; j <= r; ++j) {
val += scl[ri++ * 4 + ch] - fv;
tcl[ti++ * 4 + ch] = round(val * iarr);
}
for (int j = r + 1; j < w - r; ++j) {
val += scl[ri++ * 4 + ch] - scl[li++ * 4 + ch];
tcl[ti++ * 4 + ch] = round(val * iarr);
}
for (int j = w - r; j < w; ++j) {
val += lv - scl[li++ * 4 + ch];
tcl[ti++ * 4 + ch] = round(val * iarr);
}
}
}
}
void Blur::boxBlurT(unsigned char *scl, unsigned char *tcl, int w, int h, int r) {
float iarr = 1.0 / (r + r + 1);
#pragma omp parallel for shared (scl, tcl)
for (int i = 0; i < w; i++) {
for (int ch = 0; ch < 4; ++ch) {
int ti = i, li = ti, ri = ti + r * w;
int fv = scl[ti * 4 + ch], lv = scl[(ti + w * (h - 1)) * 4 + ch], val = (r + 1) * fv;
for (int j = 0; j < r; j++) val += scl[(ti + j * w) * 4 + ch];
for (int j = 0; j <= r; j++) {
val += scl[ri * 4 + ch] - fv;
tcl[ti * 4 + ch] = round(val * iarr);
ri += w;
ti += w;
}
for (int j = r + 1; j < h - r; j++) {
val += scl[ri * 4 + ch] - scl[li * 4 + ch];
tcl[ti * 4 + ch] = round(val * iarr);
li += w;
ri += w;
ti += w;
}
for (int j = h - r; j < h; j++) {
val += lv - scl[li * 4 + ch];
tcl[ti * 4 + ch] = round(val * iarr);
li += w;
ti += w;
}
}
}
}
// Generate JSON string of this object
std::string Blur::Json() {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::JsonValue for this object
Json::Value Blur::JsonValue() {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
root["horizontal_radius"] = horizontal_radius.JsonValue();
root["vertical_radius"] = vertical_radius.JsonValue();
root["sigma"] = sigma.JsonValue();
root["iterations"] = iterations.JsonValue();
// return JsonValue
return root;
}
// Load JSON string into this object
void Blur::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 Blur::SetJsonValue(Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
if (!root["horizontal_radius"].isNull())
horizontal_radius.SetJsonValue(root["horizontal_radius"]);
if (!root["vertical_radius"].isNull())
vertical_radius.SetJsonValue(root["vertical_radius"]);
if (!root["sigma"].isNull())
sigma.SetJsonValue(root["sigma"]);
if (!root["iterations"].isNull())
iterations.SetJsonValue(root["iterations"]);
}
// Get all properties for a specific frame
std::string Blur::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, 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["horizontal_radius"] = add_property_json("Horizontal Radius", horizontal_radius.GetValue(requested_frame), "float", "", &horizontal_radius, 0, 100, false, requested_frame);
root["vertical_radius"] = add_property_json("Vertical Radius", vertical_radius.GetValue(requested_frame), "float", "", &vertical_radius, 0, 100, false, requested_frame);
root["sigma"] = add_property_json("Sigma", sigma.GetValue(requested_frame), "float", "", &sigma, 0, 100, false, requested_frame);
root["iterations"] = add_property_json("Iterations", iterations.GetValue(requested_frame), "float", "", &iterations, 0, 100, false, requested_frame);
// Return formatted string
return root.toStyledString();
}