134 lines
4.2 KiB
C++
134 lines
4.2 KiB
C++
#ifndef BWIDGETS_COLOR_HPP
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#define BWIDGETS_COLOR_HPP
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#include <cmath>
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#include <cstdint>
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#include <functional>
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#include <SDL2/SDL_assert.h>
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#include <SDL2/SDL_pixels.h>
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#include <basic_widgets/core/type/concepts.hpp>
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namespace bwidgets
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{
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class Color final
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{
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public:
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[[nodiscard]] auto& operator()() noexcept
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{
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return sdl_type;
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}
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[[nodiscard]] const auto& operator()() const noexcept
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{
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return sdl_type;
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}
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private:
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bool _operate_on_alpha;
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bool _operate_on_colors;
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template<Numeric N>
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auto _operate(N operand, const std::function<N(N, N)>& operator_) const noexcept
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{
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Color c(sdl_type, _operate_on_alpha, _operate_on_colors);
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if (_operate_on_alpha) {
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auto a = std::round(operator_(c().a, operand));
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SDL_assert_release(a == (uint8_t)a); // NOLINT
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c().a = (uint8_t)a;
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}
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if (_operate_on_colors) {
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auto r = std::round(operator_(c().r, operand));
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auto g = std::round(operator_(c().g, operand));
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auto b = std::round(operator_(c().b, operand));
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// NOLINTNEXTLINE
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SDL_assert_release(r == (uint8_t)r && g == (uint8_t)g
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&& b == (uint8_t)b);
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c().r = (uint8_t)r;
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c().g = (uint8_t)g;
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c().b = (uint8_t)b;
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}
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return c;
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}
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public:
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SDL_Color sdl_type;
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Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a, bool op_on_alpha = false,
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bool op_on_colors = true) noexcept
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: _operate_on_alpha(op_on_alpha),
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_operate_on_colors(op_on_colors),
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sdl_type({r, g, b, a})
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{}
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inline Color(const SDL_Color& c = {}, bool op_on_alpha = false,
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bool op_on_colors = true) noexcept
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: _operate_on_alpha(op_on_alpha), _operate_on_colors(op_on_colors), sdl_type(c)
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{}
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Color(const Color&) noexcept = default;
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Color(Color&&) noexcept = default;
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~Color() = default;
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[[nodiscard]] auto alpha() const noexcept -> Color
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{
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return {sdl_type, _operate_on_colors, true};
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}
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[[nodiscard]] auto colors() const noexcept -> Color
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{
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return {sdl_type, true, _operate_on_alpha};
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}
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template<Numeric N>
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[[nodiscard]] auto operator+(const N& operand) const noexcept
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{
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return _operate(operand, [](const N& a, const N& b) { return a + b; });
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}
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template<Numeric N>
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[[nodiscard]] auto operator-(const N& operand) const noexcept
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{
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return _operate(operand, [](const N& a, const N& b) { return a - b; });
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}
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template<Numeric N>
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[[nodiscard]] auto operator*(const N& operand) const noexcept
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{
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return _operate(operand, [](const N& a, const N& b) { return a * b; });
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}
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template<Numeric N>
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[[nodiscard]] auto operator/(const N& operand) const noexcept
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{
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SDL_assert_release(operand != 0); // NOLINT
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return _operate<N>(operand, [](const N& a, const N& b) { return a / b; });
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}
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auto operator=(const Color& c) noexcept -> Color& = default;
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auto operator=(Color&&) noexcept -> Color& = default;
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auto& operator=(const SDL_Color& c) noexcept
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{
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sdl_type = c;
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return *this;
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}
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[[nodiscard]] auto operator==(const Color& other) const noexcept
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{
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return (_operate_on_colors && sdl_type.r == other().r
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&& sdl_type.g == other().g && sdl_type.b == other().b)
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|| (_operate_on_alpha && sdl_type.a == other().a);
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}
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[[nodiscard]] auto operator!=(const Color& other) const noexcept
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{
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return (sdl_type.r != other().r || sdl_type.g != other().g
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|| sdl_type.b != other().b)
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&& ((_operate_on_alpha && sdl_type.a != other().a)
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|| !_operate_on_alpha);
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}
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};
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}
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#endif
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