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/**
* @file
* @brief Unit tests for Sharpen 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/Sharpen.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 tiny 3×720 grayscale frame
static std::shared_ptr<Frame> makeGrayFrame()
{
QImage img(3, 720, QImage::Format_ARGB32);
img.fill(QColor(128,128,128,255));
img.setPixelColor(1,1, QColor(100,100,100,255));
auto frame = std::make_shared<Frame>();
*frame->GetImage() = img;
return frame;
}
// Create a tiny 3×720 colored frame
static std::shared_ptr<Frame> makeColorFrame()
{
QImage img(3, 720, QImage::Format_ARGB32);
img.fill(QColor(128,128,128,255));
img.setPixelColor(1,1, QColor(100,150,200,255));
auto frame = std::make_shared<Frame>();
*frame->GetImage() = img;
return frame;
}
TEST_CASE("zero radius leaves image unchanged", "[effect][sharpen]")
{
Sharpen effect;
effect.amount = Keyframe(1.0);
effect.radius = Keyframe(0.0);
effect.threshold = Keyframe(1.0);
auto frame = makeGrayFrame();
QColor before = frame->GetImage()->pixelColor(1,1);
auto out = effect.GetFrame(frame, 1);
QColor after = out->GetImage()->pixelColor(1,1);
CHECK(after == before);
}
TEST_CASE("nonzero radius and threshold sharpens tiny grayscale image", "[effect][sharpen]")
{
Sharpen effect;
effect.amount = Keyframe(1.0);
effect.radius = Keyframe(1.0);
effect.threshold = Keyframe(1.0);
auto frame = makeGrayFrame();
QColor before = frame->GetImage()->pixelColor(1,1);
auto out = effect.GetFrame(frame, 1);
QColor after = out->GetImage()->pixelColor(1,1);
CHECK(after != before);
}
TEST_CASE("zero amount leaves image unchanged", "[effect][sharpen]")
{
Sharpen effect;
effect.amount = Keyframe(0.0);
effect.radius = Keyframe(1.0);
effect.threshold = Keyframe(1.0);
auto frame = makeGrayFrame();
QColor before = frame->GetImage()->pixelColor(1,1);
auto out = effect.GetFrame(frame, 1);
QColor after = out->GetImage()->pixelColor(1,1);
CHECK(after == before);
}
TEST_CASE("HighPass vs UnsharpMask produce distinct results on grayscale", "[effect][sharpen]")
{
Sharpen usm, hp;
usm.amount = Keyframe(2.0);
usm.radius = Keyframe(1.0);
usm.threshold = Keyframe(0.0);
usm.mode = 0; // UnsharpMask
hp = usm;
hp.mode = 1; // HighPassBlend
auto f1 = makeGrayFrame();
auto f2 = makeGrayFrame();
QColor out_usm = usm.GetFrame(f1,1)->GetImage()->pixelColor(1,1);
QColor out_hp = hp .GetFrame(f2,1)->GetImage()->pixelColor(1,1);
CHECK(out_hp != out_usm);
}
TEST_CASE("Luma-only differs from All on colored image", "[effect][sharpen]")
{
Sharpen allc, lumac;
allc.amount = Keyframe(2.0);
allc.radius = Keyframe(1.0);
allc.threshold = Keyframe(0.0);
allc.mode = 0;
allc.channel = 0; // All
lumac = allc;
lumac.channel = 1; // Luma only
auto f_all = makeColorFrame();
auto f_luma = makeColorFrame();
QColor out_all = allc .GetFrame(f_all, 1)->GetImage()->pixelColor(1,1);
QColor out_luma = lumac.GetFrame(f_luma,1)->GetImage()->pixelColor(1,1);
CHECK(out_luma != out_all);
}
TEST_CASE("Chroma-only differs from All on colored image", "[effect][sharpen]")
{
Sharpen allc, chromac;
allc.amount = Keyframe(2.0);
allc.radius = Keyframe(1.0);
allc.threshold = Keyframe(0.0);
allc.mode = 0;
allc.channel = 0; // All
chromac = allc;
chromac.channel = 2; // Chroma only
auto f_all = makeColorFrame();
auto f_chroma = makeColorFrame();
QColor out_all = allc .GetFrame(f_all, 1)->GetImage()->pixelColor(1,1);
QColor out_chroma = chromac.GetFrame(f_chroma,1)->GetImage()->pixelColor(1,1);
CHECK(out_chroma != out_all);
}
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