virtualx-engine/tests/test_color.h

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/*  test_color.h                                                         */
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#ifndef TEST_COLOR_H
#define TEST_COLOR_H

#include "core/color.h"

#include "thirdparty/doctest/doctest.h"

namespace TestColor {

TEST_CASE("[Color] Constructor methods") {
	const Color blue_rgba = Color(0.25098, 0.376471, 1, 0.501961);
	// HTML currently uses ARGB notation, which is contrary to the CSS standard.
	// This may be changed to RGBA in 4.0.
	const Color blue_html = Color::html("#804060ff");
	const Color blue_hex = Color::hex(0x4060ff80);
	const Color blue_hex64 = Color::hex64(0x4040'6060'ffff'8080);

	CHECK_MESSAGE(
			blue_rgba.is_equal_approx(blue_html),
			"Creation with HTML notation should result in components approximately equal to the default constructor.");
	CHECK_MESSAGE(
			blue_rgba.is_equal_approx(blue_hex),
			"Creation with a 32-bit hexadecimal number should result in components approximately equal to the default constructor.");
	CHECK_MESSAGE(
			blue_rgba.is_equal_approx(blue_hex64),
			"Creation with a 64-bit hexadecimal number should result in components approximately equal to the default constructor.");

	ERR_PRINT_OFF;
	const Color html_invalid = Color::html("invalid");
	ERR_PRINT_ON;

	CHECK_MESSAGE(
			html_invalid.is_equal_approx(Color()),
			"Creation with invalid HTML notation should result in a Color with the default values.");

	const Color green_rgba = Color(0, 1, 0, 0.25);
	const Color green_hsva = Color(0, 0, 0).from_hsv(120 / 360.0, 1, 1, 0.25);

	CHECK_MESSAGE(
			green_rgba.is_equal_approx(green_hsva),
			"Creation with HSV notation should result in components approximately equal to the default constructor.");
}

TEST_CASE("[Color] Operators") {
	const Color blue = Color(0.2, 0.2, 1);
	const Color dark_red = Color(0.3, 0.1, 0.1);

	// Color components may be negative. Also, the alpha component may be greater than 1.0.
	CHECK_MESSAGE(
			(blue + dark_red).is_equal_approx(Color(0.5, 0.3, 1.1, 2)),
			"Color addition should behave as expected.");
	CHECK_MESSAGE(
			(blue - dark_red).is_equal_approx(Color(-0.1, 0.1, 0.9, 0)),
			"Color subtraction should behave as expected.");
	CHECK_MESSAGE(
			(blue * 2).is_equal_approx(Color(0.4, 0.4, 2, 2)),
			"Color multiplication with a scalar should behave as expected.");
	CHECK_MESSAGE(
			(blue / 2).is_equal_approx(Color(0.1, 0.1, 0.5, 0.5)),
			"Color division with a scalar should behave as expected.");
	CHECK_MESSAGE(
			(blue * dark_red).is_equal_approx(Color(0.06, 0.02, 0.1)),
			"Color multiplication with another Color should behave as expected.");
	CHECK_MESSAGE(
			(blue / dark_red).is_equal_approx(Color(0.666667, 2, 10)),
			"Color division with another Color should behave as expected.");
	CHECK_MESSAGE(
			(-blue).is_equal_approx(Color(0.8, 0.8, 0, 0)),
			"Color negation should behave as expected (affecting the alpha channel, unlike `invert()`).");
}

TEST_CASE("[Color] Reading methods") {
	const Color dark_blue = Color(0, 0, 0.5, 0.4);

	CHECK_MESSAGE(
			Math::is_equal_approx(dark_blue.get_h(), 240 / 360.0),
			"The returned HSV hue should match the expected value.");
	CHECK_MESSAGE(
			Math::is_equal_approx(dark_blue.get_s(), 1),
			"The returned HSV saturation should match the expected value.");
	CHECK_MESSAGE(
			Math::is_equal_approx(dark_blue.get_v(), 0.5),
			"The returned HSV value should match the expected value.");
}

TEST_CASE("[Color] Conversion methods") {
	const Color cyan = Color(0, 1, 1);
	const Color cyan_transparent = Color(0, 1, 1, 0);

	CHECK_MESSAGE(
			cyan.to_html() == "ff00ffff",
			"The returned RGB HTML color code should match the expected value.");
	CHECK_MESSAGE(
			cyan_transparent.to_html() == "0000ffff",
			"The returned RGBA HTML color code should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_argb32() == 0xff00ffff,
			"The returned 32-bit RGB number should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_abgr32() == 0xffffff00,
			"The returned 32-bit BGR number should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_rgba32() == 0x00ffffff,
			"The returned 32-bit BGR number should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_argb64() == 0xffff'0000'ffff'ffff,
			"The returned 64-bit RGB number should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_abgr64() == 0xffff'ffff'ffff'0000,
			"The returned 64-bit BGR number should match the expected value.");
	CHECK_MESSAGE(
			cyan.to_rgba64() == 0x0000'ffff'ffff'ffff,
			"The returned 64-bit BGR number should match the expected value.");
	CHECK_MESSAGE(
			String(cyan) == "0, 1, 1, 1",
			"The string representation should match the expected value.");
}

TEST_CASE("[Color] Named colors") {
	CHECK_MESSAGE(
			Color::named("red").is_equal_approx(Color(1, 0, 0)),
			"The named color \"red\" should match the expected value.");

	// Named colors have their names automatically normalized.
	CHECK_MESSAGE(
			Color::named("white_smoke").is_equal_approx(Color(0.96, 0.96, 0.96)),
			"The named color \"white_smoke\" should match the expected value.");
	CHECK_MESSAGE(
			Color::named("Slate Blue").is_equal_approx(Color(0.42, 0.35, 0.80)),
			"The named color \"Slate Blue\" should match the expected value.");

	ERR_PRINT_OFF;
	CHECK_MESSAGE(
			Color::named("doesn't exist").is_equal_approx(Color()),
			"The invalid named color \"doesn't exist\" should result in a Color with the default values.");
	ERR_PRINT_ON;
}

TEST_CASE("[Color] Validation methods") {
	CHECK_MESSAGE(
			Color::html_is_valid("#4080ff"),
			"Valid HTML color (with leading #) should be considered valid.");
	CHECK_MESSAGE(
			Color::html_is_valid("4080ff"),
			"Valid HTML color (without leading #) should be considered valid.");
	CHECK_MESSAGE(
			!Color::html_is_valid("12345"),
			"Invalid HTML color should be considered invalid.");
	CHECK_MESSAGE(
			!Color::html_is_valid("#fuf"),
			"Invalid HTML color should be considered invalid.");
}

TEST_CASE("[Color] Manipulation methods") {
	const Color blue = Color(0, 0, 1, 0.4);

	CHECK_MESSAGE(
			blue.inverted().is_equal_approx(Color(1, 1, 0, 0.4)),
			"Inverted color should have its red, green and blue components inverted.");
	CHECK_MESSAGE(
			blue.contrasted().is_equal_approx(Color(0.5, 0.5, 0.5, 0.4)),
			"Contrasted pure blue should be fully gray.");

	const Color purple = Color(0.5, 0.2, 0.5, 0.25);

	CHECK_MESSAGE(
			purple.lightened(0.2).is_equal_approx(Color(0.6, 0.36, 0.6, 0.25)),
			"Color should be lightened by the expected amount.");
	CHECK_MESSAGE(
			purple.darkened(0.2).is_equal_approx(Color(0.4, 0.16, 0.4, 0.25)),
			"Color should be darkened by the expected amount.");

	const Color red = Color(1, 0, 0, 0.2);
	const Color yellow = Color(1, 1, 0, 0.8);

	CHECK_MESSAGE(
			red.lerp(yellow, 0.5).is_equal_approx(Color(1, 0.5, 0, 0.5)),
			"Red interpolated with yellow should be orange (with interpolated alpha).");
}

} // namespace TestColor

#endif // TEST_COLOR_H