EffectBase.cpp

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#include <utility>
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <cmath>
 
#include "EffectBase.h"
 
#include "Exceptions.h"
#include "Clip.h"
#include "Timeline.h"
#include "ReaderBase.h"
#include "ChunkReader.h"
#include "FFmpegReader.h"
#include "QtImageReader.h"
#include "Logger.h"
#include <omp.h>
#include <QBrush>
#include <QColor>
#include <QPainter>
#include <QRectF>
 
#ifdef USE_IMAGEMAGICK
    #include "ImageReader.h"
#endif
 
#ifdef USE_OPENCV
    #include "TrackedObjectBBox.h"
#endif
 
using namespace openshot;
 
// Initialize the values of the EffectInfo struct
void EffectBase::InitEffectInfo()
{
    // Init clip settings
    Position(0.0);
    Layer(0);
    Start(0.0);
    End(0.0);
    Order(0);
    ParentClip(NULL);
    parentEffect = NULL;
    mask_invert = false;
    mask_reader = NULL;
    mask_source_id = "";
    mask_time_mode = MASK_TIME_SOURCE_FPS;
    mask_loop_mode = MASK_LOOP_PLAY_ONCE;
 
    info.has_video = false;
    info.has_audio = false;
    info.has_tracked_object = false;
    info.name = "";
    info.description = "";
    info.parent_effect_id = "";
    info.apply_before_clip = true;
}
 
// Display file information
void EffectBase::DisplayInfo(std::ostream* out) {
    *out << std::fixed << std::setprecision(2) << std::boolalpha;
    *out << "----------------------------" << std::endl;
    *out << "----- Effect Information -----" << std::endl;
    *out << "----------------------------" << std::endl;
    *out << "--> Name: " << info.name << std::endl;
    *out << "--> Description: " << info.description << std::endl;
    *out << "--> Has Video: " << info.has_video << std::endl;
    *out << "--> Has Audio: " << info.has_audio << std::endl;
    *out << "--> Apply to Source: " << info.apply_before_clip << std::endl;
    *out << "--> Order: " << order << std::endl;
    *out << "----------------------------" << std::endl;
}
 
// Constrain a color value from 0 to 255
int EffectBase::constrain(int color_value)
{
    // Constrain new color from 0 to 255
    if (color_value < 0)
        color_value = 0;
    else if (color_value > 255)
        color_value = 255;
 
    return color_value;
}
 
// Generate JSON string of this object
std::string EffectBase::Json() const {
 
    // Return formatted string
    return JsonValue().toStyledString();
}
 
// Generate Json::Value for this object
Json::Value EffectBase::JsonValue() const {
 
    // Create root json object
    Json::Value root = ClipBase::JsonValue(); // get parent properties
    root["name"] = info.name;
    root["class_name"] = info.class_name;
    root["description"] = info.description;
    root["parent_effect_id"] = info.parent_effect_id;
    root["has_video"] = info.has_video;
    root["has_audio"] = info.has_audio;
    root["has_tracked_object"] = info.has_tracked_object;
    root["apply_before_clip"] = info.apply_before_clip;
    root["order"] = Order();
    root["mask_invert"] = mask_invert;
    root["mask_source_id"] = mask_source_id;
    root["mask_time_mode"] = mask_time_mode;
    root["mask_loop_mode"] = mask_loop_mode;
    if (mask_reader)
        root["mask_reader"] = mask_reader->JsonValue();
    else
        root["mask_reader"] = Json::objectValue;
 
    // return JsonValue
    return root;
}
 
// Load JSON string into this object
void EffectBase::SetJson(const std::string value) {
 
    // Parse JSON string into JSON objects
    try
    {
        Json::Value root = openshot::stringToJson(value);
        // Set all values that match
        SetJsonValue(std::move(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 EffectBase::SetJsonValue(Json::Value root) {
    const std::string original_id = this->Id();
    const std::string original_parent_effect_id = this->info.parent_effect_id;
 
    // Set this effect properties with the parent effect properties (except the id and parent_effect_id)
    Json::Value my_root;
    const bool applying_parent_payload =
        !original_id.empty() &&
        !original_parent_effect_id.empty() &&
        !root["id"].isNull() &&
        root["id"].asString() == original_parent_effect_id &&
        root["id"].asString() != original_id;
    if (applying_parent_payload) {
        my_root = std::move(root);
        my_root["id"] = original_id;
        my_root["parent_effect_id"] = original_parent_effect_id;
    } else if (parentEffect){
        my_root = parentEffect->JsonValue();
        my_root["id"] = this->Id();
        my_root["parent_effect_id"] = this->info.parent_effect_id;
    } else {
        my_root = std::move(root);
    }
 
    // Legacy compatibility: older shared-mask JSON stored source trim
    // separately from the effect trim. Canonical trim now uses ClipBase.
    if (my_root["start"].isNull() && !my_root["mask_start"].isNull())
        my_root["start"] = my_root["mask_start"];
    if (my_root["end"].isNull() && !my_root["mask_end"].isNull())
        my_root["end"] = my_root["mask_end"];
 
    // Set parent data
    SetBaseJsonValue(my_root);
 
    // Set data from Json (if key is found)
    if (!my_root["order"].isNull())
        Order(my_root["order"].asInt());
 
    if (!my_root["apply_before_clip"].isNull())
        info.apply_before_clip = my_root["apply_before_clip"].asBool();
 
    if (!my_root["mask_invert"].isNull())
        mask_invert = my_root["mask_invert"].asBool();
    if (!my_root["mask_source_id"].isNull())
        MaskSourceId(my_root["mask_source_id"].asString());
    if (!my_root["mask_time_mode"].isNull()) {
        const int time_mode = my_root["mask_time_mode"].asInt();
        mask_time_mode = (time_mode == MASK_TIME_TIMELINE || time_mode == MASK_TIME_SOURCE_FPS)
            ? time_mode : MASK_TIME_SOURCE_FPS;
    }
    if (!my_root["mask_loop_mode"].isNull()) {
        const int loop_mode = my_root["mask_loop_mode"].asInt();
        if (loop_mode >= MASK_LOOP_PLAY_ONCE && loop_mode <= MASK_LOOP_PING_PONG)
            mask_loop_mode = loop_mode;
        else
            mask_loop_mode = MASK_LOOP_PLAY_ONCE;
    }
 
    const Json::Value mask_reader_json =
        !my_root["mask_reader"].isNull() ? my_root["mask_reader"] : my_root["reader"];
 
    if (!mask_reader_json.isNull()) {
        if (!mask_reader_json["type"].isNull()) {
            MaskReader(CreateReaderFromJson(mask_reader_json));
        } else if (mask_reader_json.isObject() && mask_reader_json.empty()) {
            MaskReader(NULL);
        }
    }
 
    if (!my_root["parent_effect_id"].isNull()){
        info.parent_effect_id = my_root["parent_effect_id"].asString();
        if (info.parent_effect_id.size() > 0 && info.parent_effect_id != "" && parentEffect == NULL)
            SetParentEffect(info.parent_effect_id);
        else
            parentEffect = NULL;
    }
 
    if (ParentTimeline()){
        // Get parent timeline
        Timeline* parentTimeline = static_cast<Timeline *>(ParentTimeline());
 
        // Get the list of effects on the timeline
        std::list<EffectBase*> effects = parentTimeline->ClipEffects();
 
        // TODO: Fix recursive call for Object Detection
 
        // Loop through the effects and check if we have a child effect linked to this effect
        for (auto const& effect : effects){
            // Set the properties of all effects which parentEffect points to this
            if ((effect->info.parent_effect_id == this->Id()) && (effect->Id() != this->Id()))
                effect->SetJsonValue(my_root);
        }
    }
}
 
// Generate Json::Value for this object
Json::Value EffectBase::JsonInfo() const {
 
    // Create root json object
    Json::Value root;
    root["name"] = info.name;
    root["class_name"] = info.class_name;
    root["description"] = info.description;
    root["has_video"] = info.has_video;
    root["has_audio"] = info.has_audio;
 
    // return JsonValue
    return root;
}
 
// Get all properties for a specific frame
Json::Value EffectBase::BasePropertiesJSON(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, 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);
 
    // Add replace_image choices (dropdown style)
    root["apply_before_clip"] = add_property_json("Apply to Source", info.apply_before_clip, "int", "", NULL, 0, 1, false, requested_frame);
    root["apply_before_clip"]["choices"].append(add_property_choice_json("Yes", true, info.apply_before_clip));
    root["apply_before_clip"]["choices"].append(add_property_choice_json("No", false, info.apply_before_clip));
 
    // Set the parent effect which properties this effect will inherit
    root["parent_effect_id"] = add_property_json("Parent", 0.0, "string", info.parent_effect_id, NULL, -1, -1, false, requested_frame);
 
    if (info.has_video) {
        root["mask_invert"] = add_property_json("Mask: Invert", mask_invert, "int", "", NULL, 0, 1, false, requested_frame);
        root["mask_invert"]["choices"].append(add_property_choice_json("Yes", true, mask_invert));
        root["mask_invert"]["choices"].append(add_property_choice_json("No", false, mask_invert));
 
        root["mask_time_mode"] = add_property_json("Mask: Time Mode", mask_time_mode, "int", "", NULL, 0, 1, false, requested_frame);
        root["mask_time_mode"]["choices"].append(add_property_choice_json("Timeline", MASK_TIME_TIMELINE, mask_time_mode));
        root["mask_time_mode"]["choices"].append(add_property_choice_json("Source FPS", MASK_TIME_SOURCE_FPS, mask_time_mode));
 
        root["mask_loop_mode"] = add_property_json("Mask: Loop", mask_loop_mode, "int", "", NULL, 0, 2, false, requested_frame);
        root["mask_loop_mode"]["choices"].append(add_property_choice_json("Play Once", MASK_LOOP_PLAY_ONCE, mask_loop_mode));
        root["mask_loop_mode"]["choices"].append(add_property_choice_json("Repeat", MASK_LOOP_REPEAT, mask_loop_mode));
        root["mask_loop_mode"]["choices"].append(add_property_choice_json("Ping-Pong", MASK_LOOP_PING_PONG, mask_loop_mode));
 
        if (mask_reader)
            root["mask_reader"] = add_property_json("Mask: Source", 0.0, "reader", mask_reader->Json(), NULL, 0, 1, false, requested_frame);
        else
            root["mask_reader"] = add_property_json("Mask: Source", 0.0, "reader", "{}", NULL, 0, 1, false, requested_frame);
 
        root["mask_source_id"] = add_property_json("Mask: Effect Source", 0.0, "string", mask_source_id, NULL, -1, -1, false, requested_frame);
    }
 
    return root;
}
 
ReaderBase* EffectBase::CreateReaderFromJson(const Json::Value& reader_json) const {
    if (reader_json["type"].isNull())
        return NULL;
 
    ReaderBase* reader = NULL;
    const std::string type = reader_json["type"].asString();
 
    if (type == "FFmpegReader") {
        reader = new FFmpegReader(reader_json["path"].asString());
        reader->SetJsonValue(reader_json);
        // Mask readers are video-only sources. Disabling audio avoids FFmpeg
        // A/V readiness fallbacks that can repeat stale video frames.
        reader->info.has_audio = false;
        reader->info.audio_stream_index = -1;
    } else if (type == "QtImageReader") {
        reader = new QtImageReader(reader_json["path"].asString());
        reader->SetJsonValue(reader_json);
    } else if (type == "ChunkReader") {
        reader = new ChunkReader(reader_json["path"].asString(),
                                 static_cast<ChunkVersion>(reader_json["chunk_version"].asInt()));
        reader->SetJsonValue(reader_json);
#ifdef USE_IMAGEMAGICK
    } else if (type == "ImageReader") {
        reader = new ImageReader(reader_json["path"].asString());
        reader->SetJsonValue(reader_json);
#endif
    }
 
    return reader;
}
 
void EffectBase::MaskReader(ReaderBase* new_reader) {
    if (mask_reader == new_reader)
        return;
 
    if (mask_reader) {
        mask_reader->Close();
        delete mask_reader;
    }
 
    mask_reader = new_reader;
    cached_single_mask_image.reset();
    cached_single_mask_width = 0;
    cached_single_mask_height = 0;
    if (mask_reader)
        mask_reader->ParentClip(clip);
}
 
void EffectBase::MaskSourceId(const std::string& new_mask_source_id) {
    mask_source_id = new_mask_source_id;
    cached_single_mask_image.reset();
    cached_single_mask_width = 0;
    cached_single_mask_height = 0;
}
 
EffectBase* EffectBase::ResolveMaskSourceEffect() {
    if (mask_source_id.empty())
        return NULL;
 
    Clip* parent_clip = dynamic_cast<Clip*>(clip);
    if (parent_clip) {
        EffectBase* source = parent_clip->GetEffect(mask_source_id);
        if (source && source != this)
            return source;
    }
 
    Timeline* parent_timeline = dynamic_cast<Timeline*>(ParentTimeline());
    if (parent_timeline) {
        EffectBase* source = parent_timeline->GetClipEffect(mask_source_id);
        if (!source)
            source = parent_timeline->GetEffect(mask_source_id);
        if (source && source != this)
            return source;
    }
 
    return NULL;
}
 
double EffectBase::ResolveMaskHostFps() {
    if (clip) {
        Clip* parent_clip = dynamic_cast<Clip*>(clip);
        if (parent_clip && parent_clip->info.fps.num > 0 && parent_clip->info.fps.den > 0)
            return parent_clip->info.fps.ToDouble();
    }
 
    Timeline* parent_timeline = dynamic_cast<Timeline*>(ParentTimeline());
    if (parent_timeline && parent_timeline->info.fps.num > 0 && parent_timeline->info.fps.den > 0)
        return parent_timeline->info.fps.ToDouble();
 
    if (mask_reader && mask_reader->info.fps.num > 0 && mask_reader->info.fps.den > 0)
        return mask_reader->info.fps.ToDouble();
 
    return 30.0;
}
 
double EffectBase::ResolveMaskSourceDuration() const {
    if (!mask_reader)
        return 0.0;
 
    if (mask_reader->info.duration > 0.0f)
        return static_cast<double>(mask_reader->info.duration);
 
    if (mask_reader->info.video_length > 0 &&
        mask_reader->info.fps.num > 0 && mask_reader->info.fps.den > 0) {
        return static_cast<double>(mask_reader->info.video_length) / mask_reader->info.fps.ToDouble();
    }
 
    return 0.0;
}
 
int64_t EffectBase::MapMaskFrameNumber(int64_t frame_number) {
    if (!mask_reader)
        return frame_number;
 
    int64_t requested_index = std::max(int64_t(0), frame_number - 1);
    if (!clip && ParentTimeline()) {
        const double host_fps = ResolveMaskHostFps();
        if (host_fps > 0.0) {
            const int64_t start_offset = static_cast<int64_t>(std::llround(std::max(0.0f, Start()) * host_fps));
            requested_index = std::max(int64_t(0), requested_index - start_offset);
        }
    }
    int64_t mapped_index = requested_index;
 
    if (mask_time_mode == MASK_TIME_SOURCE_FPS &&
        mask_reader->info.fps.num > 0 && mask_reader->info.fps.den > 0) {
        const double host_fps = ResolveMaskHostFps();
        const double source_fps = mask_reader->info.fps.ToDouble();
        if (host_fps > 0.0 && source_fps > 0.0) {
            const double seconds = static_cast<double>(requested_index) / host_fps;
            mapped_index = static_cast<int64_t>(std::llround(seconds * source_fps));
        }
    }
 
    const int64_t source_len = mask_reader->info.video_length;
    const double source_fps = (mask_reader->info.fps.num > 0 && mask_reader->info.fps.den > 0)
        ? mask_reader->info.fps.ToDouble() : 30.0;
    const double source_duration = ResolveMaskSourceDuration();
    const double start_sec = std::min<double>(std::max(0.0f, Start()), source_duration);
    const double end_sec = std::min<double>(std::max(0.0f, End()), source_duration);
 
    const int64_t range_start = std::max(int64_t(1), static_cast<int64_t>(std::llround(start_sec * source_fps)) + 1);
    int64_t range_end = (end_sec > 0.0)
        ? static_cast<int64_t>(std::llround(end_sec * source_fps)) + 1
        : source_len;
    if (source_len > 0)
        range_end = std::min(range_end, source_len);
    if (range_end < range_start)
        range_end = range_start;
 
    const int64_t range_len = std::max(int64_t(1), range_end - range_start + 1);
    int64_t range_index = mapped_index;
 
    switch (mask_loop_mode) {
    case MASK_LOOP_REPEAT:
        range_index = mapped_index % range_len;
        break;
    case MASK_LOOP_PING_PONG:
        if (range_len > 1) {
            const int64_t cycle_len = (range_len * 2) - 2;
            int64_t phase = mapped_index % cycle_len;
            if (phase >= range_len)
                phase = cycle_len - phase;
            range_index = phase;
        } else {
            range_index = 0;
        }
        break;
    case MASK_LOOP_PLAY_ONCE:
    default:
        if (mapped_index < 0)
            range_index = 0;
        else if (mapped_index >= range_len)
            range_index = range_len - 1;
        else
            range_index = mapped_index;
        break;
    }
 
    int64_t mapped_frame = range_start + range_index;
    if (source_len > 0)
        mapped_frame = std::min(std::max(int64_t(1), mapped_frame), source_len);
    return std::max(int64_t(1), mapped_frame);
}
 
std::shared_ptr<QImage> EffectBase::GetMaskImage(std::shared_ptr<QImage> target_image, int64_t frame_number) {
    if (!target_image || target_image->isNull())
        return {};
 
    EffectBase* source_effect = ResolveMaskSourceEffect();
    if (source_effect) {
        auto generated_mask = source_effect->TrackedObjectMask(target_image, frame_number);
        if (generated_mask && !generated_mask->isNull())
            return generated_mask;
 
        auto empty_mask = std::make_shared<QImage>(
            target_image->width(), target_image->height(), QImage::Format_RGBA8888_Premultiplied);
        empty_mask->fill(QColor(0, 0, 0, 255));
        return empty_mask;
    }
 
    if (!mask_reader)
        return {};
 
    std::shared_ptr<QImage> source_mask;
    bool used_cached_scaled = false;
    #pragma omp critical (open_effect_mask_reader)
    {
        try {
            if (!mask_reader->IsOpen())
                mask_reader->Open();
 
            if (mask_reader->info.has_single_image &&
                cached_single_mask_image &&
                cached_single_mask_width == target_image->width() &&
                cached_single_mask_height == target_image->height()) {
                source_mask = cached_single_mask_image;
                used_cached_scaled = true;
            }
            else {
                const int64_t mapped_frame = MapMaskFrameNumber(frame_number);
                auto source_frame = mask_reader->GetFrame(mapped_frame);
                if (source_frame && source_frame->GetImage() && !source_frame->GetImage()->isNull())
                    source_mask = std::make_shared<QImage>(*source_frame->GetImage());
            }
        } catch (const std::exception& e) {
            Logger::Instance()->Log(
                std::string("EffectBase::GetMaskImage unable to read mask frame: ") + e.what());
            source_mask.reset();
        }
    }
 
    if (!source_mask || source_mask->isNull())
        return {};
 
    if (used_cached_scaled)
        return source_mask;
 
    auto scaled_mask = std::make_shared<QImage>(
        source_mask->scaled(
            target_image->width(), target_image->height(),
            Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
    if (mask_reader->info.has_single_image) {
        cached_single_mask_image = scaled_mask;
        cached_single_mask_width = target_image->width();
        cached_single_mask_height = target_image->height();
    }
    return scaled_mask;
}
 
std::shared_ptr<QImage> EffectBase::TrackedObjectMask(std::shared_ptr<QImage> target_image, int64_t frame_number) const {
#ifdef USE_OPENCV
    if (!target_image || target_image->isNull() || trackedObjects.empty())
        return {};
 
    auto mask_image = std::make_shared<QImage>(
        target_image->width(), target_image->height(), QImage::Format_RGBA8888_Premultiplied);
    mask_image->fill(QColor(0, 0, 0, 255));
 
    QPainter painter(mask_image.get());
    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(Qt::NoPen);
    painter.setBrush(QBrush(QColor(255, 255, 255, 255)));
 
    bool drew_any_box = false;
    for (auto const& trackedObject : trackedObjects) {
        auto bbox = std::dynamic_pointer_cast<TrackedObjectBBox>(trackedObject.second);
        if (!bbox)
            continue;
        if (!bbox->Contains(frame_number) || bbox->visible.GetValue(frame_number) != 1)
            continue;
 
        BBox box = bbox->GetBox(frame_number);
        if (box.width <= 0.0f || box.height <= 0.0f || box.cx < 0.0f || box.cy < 0.0f)
            continue;
 
        const double x = (box.cx - box.width / 2.0) * target_image->width();
        const double y = (box.cy - box.height / 2.0) * target_image->height();
        const double w = box.width * target_image->width();
        const double h = box.height * target_image->height();
        const double corner = bbox->background_corner.GetValue(frame_number);
        QRectF rect(x, y, w, h);
 
        if (std::abs(box.angle) > 0.0001f) {
            painter.save();
            painter.translate(rect.center());
            painter.rotate(box.angle);
            painter.drawRoundedRect(QRectF(-w / 2.0, -h / 2.0, w, h), corner, corner);
            painter.restore();
        } else {
            painter.drawRoundedRect(rect, corner, corner);
        }
        drew_any_box = true;
    }
 
    painter.end();
    if (!drew_any_box)
        return {};
    return mask_image;
#else
    (void) target_image;
    (void) frame_number;
    return {};
#endif
}
 
void EffectBase::BlendWithMask(std::shared_ptr<QImage> original_image, std::shared_ptr<QImage> effected_image,
                               std::shared_ptr<QImage> mask_image) const {
    if (!original_image || !effected_image || !mask_image)
        return;
    if (original_image->size() != effected_image->size() || effected_image->size() != mask_image->size())
        return;
 
    unsigned char* original_pixels = reinterpret_cast<unsigned char*>(original_image->bits());
    unsigned char* effected_pixels = reinterpret_cast<unsigned char*>(effected_image->bits());
    unsigned char* mask_pixels = reinterpret_cast<unsigned char*>(mask_image->bits());
    const int width = effected_image->width();
    const int height = effected_image->height();
    const int original_stride = original_image->bytesPerLine();
    const int effected_stride = effected_image->bytesPerLine();
    const int mask_stride = mask_image->bytesPerLine();
 
    #pragma omp parallel for schedule(static)
    for (int y = 0; y < height; ++y) {
        unsigned char* original_row = original_pixels + y * original_stride;
        unsigned char* effected_row = effected_pixels + y * effected_stride;
        unsigned char* mask_row = mask_pixels + y * mask_stride;
        for (int x = 0; x < width; ++x) {
            const int idx = x * 4;
            int gray = qGray(mask_row[idx], mask_row[idx + 1], mask_row[idx + 2]);
            if (mask_invert)
                gray = 255 - gray;
            const float factor = static_cast<float>(gray) / 255.0f;
            const float inverse = 1.0f - factor;
 
            effected_row[idx] = static_cast<unsigned char>(
                (original_row[idx] * inverse) + (effected_row[idx] * factor));
            effected_row[idx + 1] = static_cast<unsigned char>(
                (original_row[idx + 1] * inverse) + (effected_row[idx + 1] * factor));
            effected_row[idx + 2] = static_cast<unsigned char>(
                (original_row[idx + 2] * inverse) + (effected_row[idx + 2] * factor));
            effected_row[idx + 3] = static_cast<unsigned char>(
                (original_row[idx + 3] * inverse) + (effected_row[idx + 3] * factor));
        }
    }
}
 
std::shared_ptr<openshot::Frame> EffectBase::ProcessFrame(std::shared_ptr<openshot::Frame> frame, int64_t frame_number) {
    // Audio-only effects skip common mask handling.
    if (!info.has_video || (!mask_reader && mask_source_id.empty()))
        return GetFrame(frame, frame_number);
 
    // Effects that already apply masks inside GetFrame() should bypass common blend handling.
    if (HandlesMaskInternally())
        return GetFrame(frame, frame_number);
 
    auto pre_image = frame->GetImage();
    if (!pre_image || pre_image->isNull())
        return GetFrame(frame, frame_number);
 
    const auto original_image = std::make_shared<QImage>(pre_image->copy());
    auto output_frame = GetFrame(frame, frame_number);
    if (!output_frame)
        return output_frame;
    auto effected_image = output_frame->GetImage();
    if (!effected_image || effected_image->isNull() ||
        effected_image->size() != original_image->size())
        return output_frame;
 
    auto mask_image = GetMaskImage(effected_image, frame_number);
    if (!mask_image || mask_image->isNull())
        return output_frame;
 
    if (UseCustomMaskBlend(frame_number))
        ApplyCustomMaskBlend(original_image, effected_image, mask_image, frame_number);
    else
        BlendWithMask(original_image, effected_image, mask_image);
 
    return output_frame;
}
 
openshot::ClipBase* EffectBase::ParentClip() {
    return clip;
}
 
void EffectBase::ParentClip(openshot::ClipBase* new_clip) {
    clip = new_clip;
    if (mask_reader)
        mask_reader->ParentClip(new_clip);
}
 
// Set the parent effect from which this properties will be set to
void EffectBase::SetParentEffect(std::string parentEffect_id) {
 
    // Get parent Timeline
    Timeline* parentTimeline = static_cast<Timeline *>(ParentTimeline());
 
    if (parentTimeline){
 
        // Get a pointer to the parentEffect
        EffectBase* parentEffectPtr = parentTimeline->GetClipEffect(parentEffect_id);
 
        if (parentEffectPtr){
            // Set the parent Effect
            parentEffect = parentEffectPtr;
 
            // Set the properties of this effect with the parent effect's properties
            Json::Value EffectJSON = parentEffect->JsonValue();
            EffectJSON["id"] = this->Id();
            EffectJSON["parent_effect_id"] = this->info.parent_effect_id;
            this->SetJsonValue(EffectJSON);
        }
    }
    return;
}
 
// Return the ID of this effect's parent clip
std::string EffectBase::ParentClipId() const{
    if(clip)
        return clip->Id();
    else
        return "";
}
 
EffectBase::~EffectBase() {
    MaskReader(NULL);
}