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/**
* @file
* @brief Unit tests for Lens Flare 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 <memory>
#include <QImage>
#include <QColor>
#include "Frame.h"
#include "effects/LensFlare.h"
#include "openshot_catch.h"
using namespace openshot;
// Allow Catch2 to print QColor on failure
static std::ostream& operator<<(std::ostream& os, QColor const& c)
{
os << "QColor(" << c.red() << "," << c.green()
<< "," << c.blue() << "," << c.alpha() << ")";
return os;
}
// Create a small 5×5 grayscale frame
static std::shared_ptr<Frame> makeGrayFrame()
{
QImage img(5, 5, QImage::Format_ARGB32);
img.fill(QColor(100, 100, 100, 255));
auto frame = std::make_shared<Frame>();
*frame->GetImage() = img;
return frame;
}
TEST_CASE("LensFlare brightens center pixel", "[effect][lensflare]")
{
LensFlare effect;
effect.x = Keyframe(0.0);
effect.y = Keyframe(0.0);
effect.brightness = Keyframe(1.0);
effect.size = Keyframe(1.0);
effect.spread = Keyframe(0.0);
auto frame = makeGrayFrame();
QColor before = frame->GetImage()->pixelColor(2, 2);
auto out = effect.GetFrame(frame, 1);
QColor after = out->GetImage()->pixelColor(2, 2);
CHECK(after != before);
}
TEST_CASE("LensFlare size controls area of effect", "[effect][lensflare]")
{
LensFlare small, large;
small.x = Keyframe(0.0);
large.x = Keyframe(0.0);
small.y = Keyframe(0.0);
large.y = Keyframe(0.0);
small.brightness = Keyframe(1.0);
large.brightness = Keyframe(1.0);
small.spread = Keyframe(0.0);
large.spread = Keyframe(0.0);
small.size = Keyframe(0.2);
large.size = Keyframe(1.0);
auto frameSmall = makeGrayFrame();
auto frameLarge = makeGrayFrame();
QColor beforeSmall = frameSmall->GetImage()->pixelColor(2, 2);
QColor beforeLarge = frameLarge->GetImage()->pixelColor(2, 2);
auto outSmall = small.GetFrame(frameSmall, 1);
auto outLarge = large.GetFrame(frameLarge, 1);
QColor afterSmall = outSmall->GetImage()->pixelColor(2, 2);
QColor afterLarge = outLarge->GetImage()->pixelColor(2, 2);
CHECK(afterSmall == beforeSmall);
CHECK(afterLarge != beforeLarge);
}
TEST_CASE("LensFlare brightness scales intensity", "[effect][lensflare]")
{
LensFlare low, high;
low.x = Keyframe(0.0);
high.x = Keyframe(0.0);
low.y = Keyframe(0.0);
high.y = Keyframe(0.0);
low.size = Keyframe(1.0);
high.size = Keyframe(1.0);
low.spread = Keyframe(0.0);
high.spread = Keyframe(0.0);
low.brightness = Keyframe(0.2);
high.brightness= Keyframe(1.0);
auto frameLow = makeGrayFrame();
auto frameHigh = makeGrayFrame();
auto outLow = low.GetFrame(frameLow, 1);
auto outHigh = high.GetFrame(frameHigh, 1);
QColor cLow = outLow->GetImage()->pixelColor(2, 2);
QColor cHigh = outHigh->GetImage()->pixelColor(2, 2);
CHECK(cLow.red() < cHigh.red());
}
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