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Crop.cpp
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Crop.cpp
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/**
* @file
* @brief Source file for Crop 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/Crop.h"
using namespace openshot;
/// Blank constructor, useful when using Json to load the effect properties
Crop::Crop() : left(0.1), top(0.1), right(0.1), bottom(0.1) {
// Init effect properties
init_effect_details();
}
// Default constructor
Crop::Crop(Keyframe left, Keyframe top, Keyframe right, Keyframe bottom) :
left(left), top(top), right(right), bottom(bottom)
{
// Init effect properties
init_effect_details();
}
// Init effect settings
void Crop::init_effect_details()
{
/// Initialize the values of the EffectInfo struct.
InitEffectInfo();
/// Set the effect info
info.class_name = "Crop";
info.name = "Crop";
info.description = "Crop out any part of your video.";
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> Crop::GetFrame(std::shared_ptr<Frame> frame, int64_t frame_number)
{
// Get the frame's image
std::shared_ptr<QImage> frame_image = frame->GetImage();
// Get transparent color (and create small transparent image)
std::shared_ptr<QImage> tempColor = std::shared_ptr<QImage>(new QImage(frame_image->width(), 1, QImage::Format_ARGB32_Premultiplied));
tempColor->fill(QColor(QString::fromStdString("transparent")));
// Get current keyframe values
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);
// Get pixel array pointers
unsigned char *pixels = (unsigned char *) frame_image->bits();
unsigned char *color_pixels = (unsigned char *) tempColor->bits();
// Get pixels sizes of all crop sides
int top_bar_height = top_value * frame_image->height();
int bottom_bar_height = bottom_value * frame_image->height();
int left_bar_width = left_value * frame_image->width();
int right_bar_width = right_value * frame_image->width();
// Loop through rows
for (int row = 0; row < frame_image->height(); row++) {
// Top & Bottom Crop
if ((top_bar_height > 0.0 && row <= top_bar_height) || (bottom_bar_height > 0.0 && row >= frame_image->height() - bottom_bar_height)) {
memcpy(&pixels[row * frame_image->width() * 4], color_pixels, sizeof(char) * frame_image->width() * 4);
} else {
// Left Crop
if (left_bar_width > 0.0) {
memcpy(&pixels[row * frame_image->width() * 4], color_pixels, sizeof(char) * left_bar_width * 4);
}
// Right Crop
if (right_bar_width > 0.0) {
memcpy(&pixels[((row * frame_image->width()) + (frame_image->width() - right_bar_width)) * 4], color_pixels, sizeof(char) * right_bar_width * 4);
}
}
}
// Cleanup colors and arrays
tempColor.reset();
// return the modified frame
return frame;
}
// Generate JSON string of this object
std::string Crop::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Crop::JsonValue() const {
// Create root json object
Json::Value root = EffectBase::JsonValue(); // get parent properties
root["type"] = info.class_name;
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 Crop::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 Crop::SetJsonValue(const Json::Value root) {
// Set parent data
EffectBase::SetJsonValue(root);
// Set data from Json (if key is found)
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 Crop::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["left"] = add_property_json("Left Size", left.GetValue(requested_frame), "float", "", &left, 0.0, 1.0, false, requested_frame);
root["top"] = add_property_json("Top Size", top.GetValue(requested_frame), "float", "", &top, 0.0, 1.0, false, requested_frame);
root["right"] = add_property_json("Right Size", right.GetValue(requested_frame), "float", "", &right, 0.0, 1.0, false, requested_frame);
root["bottom"] = add_property_json("Bottom Size", bottom.GetValue(requested_frame), "float", "", &bottom, 0.0, 1.0, false, requested_frame);
// Return formatted string
return root.toStyledString();
}