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/**
* @file
* @brief Unit tests for AnalogTape effect
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
// Copyright (c) 2008-2025 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include <QColor>
#include <QImage>
#include <memory>
#include "Frame.h"
#include "effects/AnalogTape.h"
#include "openshot_catch.h"
using namespace openshot;
// Fixed helper ensures Frame invariants are respected (size/format/flags)
static std::shared_ptr<Frame> makeGrayFrame(int w = 64, int h = 64) {
auto f = std::make_shared<Frame>(1, w, h, "#000000", 0, 2);
// Use premultiplied format to match Frame::AddImage expectations
auto img = std::make_shared<QImage>(w, h, QImage::Format_RGBA8888_Premultiplied);
img->fill(QColor(100, 100, 100, 255));
// Route through AddImage so width/height/has_image_data are set correctly
f->AddImage(img);
return f;
}
TEST_CASE("AnalogTape modifies frame", "[effect][analogtape]") {
AnalogTape eff;
eff.Id("analogtape-test-seed");
eff.seed_offset = 1234;
auto frame = makeGrayFrame();
QColor before = frame->GetImage()->pixelColor(2, 2);
auto out = eff.GetFrame(frame, 1);
QColor after = out->GetImage()->pixelColor(2, 2);
CHECK(after != before);
}
TEST_CASE("AnalogTape deterministic per id", "[effect][analogtape]") {
AnalogTape e1;
e1.Id("same");
AnalogTape e2;
e2.Id("same");
auto f1 = makeGrayFrame();
auto f2 = makeGrayFrame();
auto o1 = e1.GetFrame(f1, 1);
auto o2 = e2.GetFrame(f2, 1);
QColor c1 = o1->GetImage()->pixelColor(1, 1);
QColor c2 = o2->GetImage()->pixelColor(1, 1);
CHECK(c1 == c2);
}
TEST_CASE("AnalogTape seed offset alters output", "[effect][analogtape]") {
AnalogTape e1;
e1.Id("seed");
e1.seed_offset = 0;
AnalogTape e2;
e2.Id("seed");
e2.seed_offset = 5;
auto f1 = makeGrayFrame();
auto f2 = makeGrayFrame();
auto o1 = e1.GetFrame(f1, 1);
auto o2 = e2.GetFrame(f2, 1);
QColor c1 = o1->GetImage()->pixelColor(1, 1);
QColor c2 = o2->GetImage()->pixelColor(1, 1);
CHECK(c1 != c2);
}
TEST_CASE("AnalogTape stripe lifts bottom", "[effect][analogtape]") {
AnalogTape e;
e.tracking = Keyframe(0.0);
e.bleed = Keyframe(0.0);
e.softness = Keyframe(0.0);
e.noise = Keyframe(0.0);
e.stripe = Keyframe(1.0);
e.staticBands = Keyframe(0.0);
auto frame = makeGrayFrame(20, 20);
auto out = e.GetFrame(frame, 1);
QColor top = out->GetImage()->pixelColor(10, 0);
QColor bottom = out->GetImage()->pixelColor(10, 19);
CHECK(bottom.red() > top.red());
}
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