test_ColorUnits.cpp
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/**
\file test_ColorUnits.cpp
Copyright Notice\n
Copyright (C) 2020 Jan Rogall - developer\n
This file is part of hueplusplus.
hueplusplus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
hueplusplus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with hueplusplus. If not, see <http://www.gnu.org/licenses/>.
**/
#include <random>
#include <hueplusplus/ColorUnits.h>
#include <gtest/gtest.h>
using namespace hueplusplus;
TEST(ColorGamut, contains)
{
ColorGamut gamut = gamut::maxGamut;
EXPECT_TRUE(gamut.contains({0.f, 0.5f}));
EXPECT_TRUE(gamut.contains({1.f, 0.f}));
EXPECT_TRUE(gamut.contains({0.5f, 0.5f}));
EXPECT_TRUE(gamut.contains({0.f, 1.f}));
EXPECT_TRUE(gamut.contains({0.f, 0.f}));
EXPECT_FALSE(gamut.contains({1.f, 1.f}));
EXPECT_FALSE(gamut.contains({-1.f, 1.f}));
}
TEST(ColorGamut, corrected)
{
ColorGamut gamut = gamut::maxGamut;
{
const XY xy {0.f, 0.5f};
const XY result = gamut.corrected(xy);
EXPECT_FLOAT_EQ(xy.x, result.x);
EXPECT_FLOAT_EQ(xy.y, result.y);
}
{
const XY xy {0.f, 1.f};
const XY result = gamut.corrected(xy);
EXPECT_FLOAT_EQ(xy.x, result.x);
EXPECT_FLOAT_EQ(xy.y, result.y);
}
{
const XY xy {1.f, 1.f};
const XY result = gamut.corrected(xy);
EXPECT_FLOAT_EQ(0.5f, result.x);
EXPECT_FLOAT_EQ(0.5f, result.y);
}
{
const XY xy {1.f, -1.f};
const XY result = gamut.corrected(xy);
EXPECT_FLOAT_EQ(1.f, result.x);
EXPECT_FLOAT_EQ(0.f, result.y);
}
}
TEST(RGB, toXY)
{
{
const RGB red {255, 0, 0};
XYBrightness xy = red.toXY();
EXPECT_FLOAT_EQ(xy.xy.x, 0.70060623f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.299301f);
EXPECT_FLOAT_EQ(xy.brightness, 1.f);
}
{
const RGB red {255, 0, 0};
XYBrightness xy = red.toXY(gamut::gamutC);
EXPECT_FLOAT_EQ(xy.xy.x, 0.69557756f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.30972576f);
EXPECT_FLOAT_EQ(xy.brightness, 1.f);
}
{
const RGB white {255, 255, 255};
XYBrightness xy = white.toXY();
EXPECT_FLOAT_EQ(xy.xy.x, 0.32272673f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.32902291f);
EXPECT_FLOAT_EQ(xy.brightness, 1.f);
}
{
const RGB white {255, 255, 255};
XYBrightness xy = white.toXY(gamut::gamutA);
EXPECT_FLOAT_EQ(xy.xy.x, 0.32272673f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.32902291f);
EXPECT_FLOAT_EQ(xy.brightness, 1.f);
}
{
const RGB white {255, 255, 255};
XYBrightness xy = white.toXY(gamut::gamutB);
EXPECT_FLOAT_EQ(xy.xy.x, 0.32272673f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.32902291f);
EXPECT_FLOAT_EQ(xy.brightness, 1.f);
}
{
const RGB black{ 0,0,0 };
XYBrightness xy = black.toXY(gamut::maxGamut);
EXPECT_FLOAT_EQ(xy.xy.x, 0.32272673f);
EXPECT_FLOAT_EQ(xy.xy.y, 0.32902291f);
EXPECT_FLOAT_EQ(xy.brightness, 0.0f);
}
}
TEST(RGB, fromXY)
{
{
const XYBrightness xyRed {{0.70060623f, 0.299301f}, 1.f};
const RGB red = RGB::fromXY(xyRed);
EXPECT_EQ(255, red.r);
EXPECT_EQ(0, red.g);
EXPECT_EQ(0, red.b);
const XYBrightness reversed = red.toXY();
EXPECT_FLOAT_EQ(xyRed.xy.x, reversed.xy.x);
EXPECT_FLOAT_EQ(xyRed.xy.y, reversed.xy.y);
EXPECT_FLOAT_EQ(xyRed.brightness, reversed.brightness);
}
{
const XYBrightness xyWhite{ {0.32272673f, 0.32902291f}, 1.f };
const RGB white = RGB::fromXY(xyWhite);
EXPECT_EQ(255, white.r);
EXPECT_EQ(255, white.g);
EXPECT_EQ(255, white.b);
const XYBrightness reversed = white.toXY();
EXPECT_FLOAT_EQ(xyWhite.xy.x, reversed.xy.x);
EXPECT_FLOAT_EQ(xyWhite.xy.y, reversed.xy.y);
EXPECT_FLOAT_EQ(xyWhite.brightness, reversed.brightness);
}
{
const XYBrightness xyRed {{0.70060623f, 0.299301f}, 1.f};
const RGB red = RGB::fromXY(xyRed, gamut::gamutB);
const RGB red2 = RGB::fromXY({ gamut::gamutB.corrected(xyRed.xy), xyRed.brightness });
EXPECT_EQ(red2.r, red.r);
EXPECT_EQ(red2.g, red.g);
EXPECT_EQ(red2.b, red.b);
}
// Statistical tests of conversion accuracy
// Fixed seed so the tests dont fail randomly
std::mt19937 rng {12374682};
std::uniform_int_distribution<int> dist(0, 255);
uint64_t N = 1000;
uint64_t totalDiffR = 0;
uint64_t totalDiffG = 0;
uint64_t totalDiffB = 0;
int maxDiffR = 0;
int maxDiffG = 0;
int maxDiffB = 0;
for (int i = 0; i < N; ++i)
{
const RGB rgb {dist(rng), dist(rng), dist(rng)};
const XYBrightness xy = rgb.toXY();
const RGB back = RGB::fromXY(xy);
int diffR = (rgb.r - back.r) * (rgb.r - back.r);
int diffG = (rgb.g - back.g) * (rgb.g - back.g);
int diffB = (rgb.b - back.b) * (rgb.b - back.b);
totalDiffR += diffR;
totalDiffG += diffG;
totalDiffB += diffB;
maxDiffR = std::max(diffR, maxDiffR);
maxDiffG = std::max(diffG, maxDiffG);
maxDiffB = std::max(diffB, maxDiffB);
}
float varR = (float)totalDiffR / N;
float varG = (float)totalDiffG / N;
float varB = (float)totalDiffB / N;
EXPECT_LT(varR, 5.f);
EXPECT_LT(varG, 5.f);
EXPECT_LT(varB, 4.f);
EXPECT_LE(maxDiffR, 81);
EXPECT_LE(maxDiffG, 81);
EXPECT_LE(maxDiffB, 64);
}