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/**
* @file
* @brief Unit tests for ColorMap effect
* @author Jonathan Thomas
*
* @ref License
*/
// Copyright (c) 2008-2025 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
#include <memory>
#include <QImage>
#include <QColor>
#include <sstream>
#include "Frame.h"
#include "effects/ColorMap.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;
}
// Build a simple 2×2 frame with one distinct pixel
static std::shared_ptr<Frame> makeTestFrame()
{
QImage img(2, 2, QImage::Format_ARGB32);
img.fill(QColor(50,100,150,255));
img.setPixelColor(0,0, QColor(10,20,30,255));
auto frame = std::make_shared<Frame>();
*frame->GetImage() = img;
return frame;
}
// Frame that keeps the example pixel in the bright range used by the domain tests
static std::shared_ptr<Frame> makeBrightTestFrame()
{
QImage img(2, 2, QImage::Format_ARGB32);
img.fill(QColor(50,100,150,255));
img.setPixelColor(0,0, QColor(230,230,230,255));
auto frame = std::make_shared<Frame>();
*frame->GetImage() = img;
return frame;
}
// Helper to construct the LUT-path from TEST_MEDIA_PATH
static std::string lutPath()
{
std::stringstream path;
path << TEST_MEDIA_PATH << "example-lut.cube";
return path.str();
}
static std::string lut1dPath()
{
std::stringstream path;
path << TEST_MEDIA_PATH << "example-1d-lut.cube";
return path.str();
}
static std::string lutDomain1dPath()
{
std::stringstream path;
path << TEST_MEDIA_PATH << "domain-1d-lut.cube";
return path.str();
}
static std::string lutDomain3dPath()
{
std::stringstream path;
path << TEST_MEDIA_PATH << "domain-3d-lut.cube";
return path.str();
}
TEST_CASE("Default ColorMap with no LUT path leaves image unchanged", "[effect][colormap]")
{
ColorMap effect;
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
auto out = effect.GetFrame(in, 0);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after == before);
}
TEST_CASE("Overall intensity = 0 leaves image unchanged even when LUT is set", "[effect][colormap]")
{
ColorMap effect(
lutPath(),
Keyframe(0.0), // overall off
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
auto out = effect.GetFrame(in, 1);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after == before);
}
TEST_CASE("JSON round-trip preserves LUT path and intensity keyframe values", "[effect][colormap][json]")
{
ColorMap A(
lutPath(),
Keyframe(0.3), // overall
Keyframe(0.4),
Keyframe(0.5),
Keyframe(0.6)
);
std::string serialized = A.Json();
ColorMap B;
B.SetJson(serialized);
CHECK(B.JsonValue()["lut_path"].asString() == lutPath());
CHECK( B.intensity. GetValue(0) == Approx(0.3) );
CHECK( B.intensity_r.GetValue(0) == Approx(0.4) );
CHECK( B.intensity_g.GetValue(0) == Approx(0.5) );
CHECK( B.intensity_b.GetValue(0) == Approx(0.6) );
}
TEST_CASE("Clearing LUT path via JSON leaves LUT path empty", "[effect][colormap][json]")
{
ColorMap effect(
lutPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
Json::Value clear;
clear["lut_path"] = std::string("");
effect.SetJsonValue(clear);
auto v = effect.JsonValue();
CHECK(v["lut_path"].asString() == "");
}
TEST_CASE("PropertiesJSON exposes all four intensity properties", "[effect][colormap][ui]")
{
ColorMap effect;
std::string props = effect.PropertiesJSON(0);
Json::CharReaderBuilder rb;
Json::Value root;
std::string errs;
std::istringstream is(props);
REQUIRE(Json::parseFromStream(rb, is, &root, &errs));
CHECK(root.isMember("lut_path"));
CHECK(root.isMember("intensity"));
CHECK(root.isMember("intensity_r"));
CHECK(root.isMember("intensity_g"));
CHECK(root.isMember("intensity_b"));
}
TEST_CASE("Full-intensity LUT changes pixel values", "[effect][colormap][lut]")
{
ColorMap effect(
lutPath(),
Keyframe(1.0), // full overall
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
auto out = effect.GetFrame(in, 2);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after != before);
}
TEST_CASE("Half-intensity LUT changes pixel values less than full-intensity", "[effect][colormap][lut]")
{
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
ColorMap half(
lutPath(),
Keyframe(0.5), // half overall
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto out_half = half.GetFrame(in, 3);
QColor h = out_half->GetImage()->pixelColor(0,0);
ColorMap full(
lutPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto out_full = full.GetFrame(in, 3);
QColor f = out_full->GetImage()->pixelColor(0,0);
int diff_half = std::abs(h.red() - before.red())
+ std::abs(h.green() - before.green())
+ std::abs(h.blue() - before.blue());
int diff_full = std::abs(f.red() - before.red())
+ std::abs(f.green() - before.green())
+ std::abs(f.blue() - before.blue());
CHECK(diff_half < diff_full);
}
TEST_CASE("1D LUT files alter pixel values", "[effect][colormap][lut][1d]")
{
ColorMap effect(
lut1dPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
auto out = effect.GetFrame(in, 4);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after != before);
}
TEST_CASE("1D LUT obeys DOMAIN_MIN and DOMAIN_MAX", "[effect][colormap][lut][domain]")
{
ColorMap effect(
lutDomain1dPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto out = effect.GetFrame(makeBrightTestFrame(), 0);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after == QColor(255,0,0,255));
}
TEST_CASE("3D LUT obeys DOMAIN_MIN and DOMAIN_MAX", "[effect][colormap][lut][domain]")
{
ColorMap effect(
lutDomain3dPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto out = effect.GetFrame(makeBrightTestFrame(), 0);
QColor after = out->GetImage()->pixelColor(0,0);
CHECK(after == QColor(255,0,0,255));
}
TEST_CASE("Disabling red channel produces different result than full-intensity", "[effect][colormap][lut]")
{
auto in = makeTestFrame();
QColor before = in->GetImage()->pixelColor(0,0);
ColorMap full(
lutPath(),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0),
Keyframe(1.0)
);
auto out_full = full.GetFrame(in, 4);
QColor f = out_full->GetImage()->pixelColor(0,0);
ColorMap red_off(
lutPath(),
Keyframe(1.0),
Keyframe(0.0), // red off
Keyframe(1.0),
Keyframe(1.0)
);
auto out_off = red_off.GetFrame(in, 4);
QColor r = out_off->GetImage()->pixelColor(0,0);
CHECK(r != f);
}
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