srctree

Robin Linden parent 58ce4e7d a09c9e6c
gfx: Add a Color constructor that accepts a packed rgba int

gfx/color.h added: 19, removed: 2, total 17

@@ -18,6 +18,13 @@ struct Color {

};

}

constexpr static Color from_rgba(std::int32_t rgba) {

auto alpha = static_cast<std::uint8_t>(rgba & 0xFF);

auto color = from_rgb((rgba & 0xFF'FF'FF'00) >> 8);

color.a = alpha;

return color;

}

std::uint8_t r, g, b, a{0xFF};

[[nodiscard]] constexpr std::uint32_t as_rgba_u32() const { return r << 24 | g << 16 | b << 8 | a; }

gfx/color_test.cpp added: 19, removed: 2, total 17

@@ -17,9 +17,19 @@ int main() {

expect(Color{0xFF, 0xFF, 0xFF} == Color::from_rgb(0xFF'FF'FF));

});

etest::test("Color::from_rgba", [] {

expect(Color{0x12, 0x34, 0x56, 0x78} == Color::from_rgba(0x12'34'56'78));

expect(Color{.a = 0x00} == Color::from_rgba(0));

expect(Color{0xFF, 0xFF, 0xFF, 0xFF} == Color::from_rgba(0xFF'FF'FF'FF));

expect(Color{0xFF, 0xFF, 0xFF, 0x00} == Color::from_rgba(0xFF'FF'FF'00));

});

etest::test("Color::as_rgba_u32", [] {

expect_eq(Color{0x12, 0x34, 0x56}.as_rgba_u32(), 0x12'34'56'FFu);

expect_eq(Color{0x12, 0x34, 0x56, 0x78}.as_rgba_u32(), 0x12'34'56'78u);

auto c = Color{0x12, 0x34, 0x56, 0x78};

expect_eq(Color::from_rgba(static_cast<std::int32_t>(c.as_rgba_u32())), c);

});

return etest::run_all_tests();