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595 lines
18 KiB
595 lines
18 KiB
#ifndef AMT_PIXEL_HPP
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#define AMT_PIXEL_HPP
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#include "matrix.hpp"
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#include <algorithm>
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#include <cmath>
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#include <cstddef>
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#include <cstdint>
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#include <limits>
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#include <stdexcept>
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namespace amt {
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enum class PixelFormat {
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rgba,
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abgr,
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rgb ,
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bgr ,
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ga , // gray scale and alpha
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ag , // alpha and gray scale
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g // gray scale
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};
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inline static constexpr auto get_pixel_format_from_channel(std::size_t c, bool little_endian = false) -> PixelFormat {
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switch (c) {
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case 1: return PixelFormat::g;
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case 2: return little_endian ? PixelFormat::ag : PixelFormat::ga;
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case 3: return little_endian ? PixelFormat::bgr : PixelFormat::rgb;
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case 4: return little_endian ? PixelFormat::abgr : PixelFormat::abgr;
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}
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throw std::runtime_error(std::string("get_pixel_format_from_channel: unknown channel ") + std::to_string(c));
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}
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namespace detail {
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static constexpr auto compare_float(float l, float r) noexcept -> bool {
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return std::abs(l - r) < std::numeric_limits<float>::epsilon();
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}
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} // namespace detail
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enum class BlendMode {
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normal,
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multiply,
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screen,
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overlay,
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darken,
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lighten,
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colorDodge,
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colorBurn,
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hardLight,
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softLight,
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difference,
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exclusion
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};
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struct RGBA {
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using pixel_t = std::uint8_t;
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pixel_t r{}; // 0-255
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pixel_t g{}; // 0-255
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pixel_t b{}; // 0-255
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pixel_t a{}; // 0-255
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constexpr RGBA() noexcept = default;
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constexpr RGBA(RGBA const&) noexcept = default;
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constexpr RGBA(RGBA &&) noexcept = default;
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RGBA& operator=(RGBA const& other) noexcept {
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// HACK: clang was unable to optimize the copy using a single move instruction.
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auto& self = *reinterpret_cast<std::uint32_t*>(this);
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auto color = *reinterpret_cast<std::uint32_t const*>(&other);
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self = color;
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return *this;
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}
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RGBA& operator=(RGBA && other) noexcept {
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// HACK: clang was unable to optimize the copy using a single move instruction
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auto& self = *reinterpret_cast<std::uint32_t*>(this);
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auto color = *reinterpret_cast<std::uint32_t const*>(&other);
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self = color;
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return *this;
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}
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constexpr ~RGBA() noexcept = default;
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constexpr RGBA(pixel_t r, pixel_t g, pixel_t b, pixel_t a = 0xff) noexcept
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: r(r)
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, g(g)
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, b(b)
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, a(a)
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{}
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constexpr RGBA(pixel_t color, pixel_t a = 0xff) noexcept
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: RGBA(color, color, color, a)
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{}
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// NOTE: RRGGBBAA
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constexpr static auto from_hex(std::uint32_t color) noexcept -> RGBA {
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return RGBA(
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((color >> (8 * 3)) & 0xff),
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((color >> (8 * 2)) & 0xff),
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((color >> (8 * 1)) & 0xff),
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((color >> (8 * 0)) & 0xff)
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);
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}
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// NOTE: RRGGBBAA
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constexpr auto to_hex() const noexcept -> std::uint32_t {
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auto r = static_cast<std::uint32_t>(this->r);
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auto b = static_cast<std::uint32_t>(this->b);
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auto g = static_cast<std::uint32_t>(this->g);
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auto a = static_cast<std::uint32_t>(this->a);
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return (r << (8 * 3)) | (g << (8 * 2)) | (b << (8 * 1)) | (a << (8 * 0));
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}
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constexpr auto blend(RGBA color, BlendMode mode) const noexcept -> RGBA {
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auto ab = normalize(a);
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auto as = normalize(color.a);
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// αs x 1 + αb x (1 – αs)
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auto alpha = to_pixel(as + ab * (1 - as));
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auto nr = blend_helper(normalize(r), normalize(color.r), normalize(a), mode);
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auto ng = blend_helper(normalize(g), normalize(color.g), normalize(a), mode);
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auto nb = blend_helper(normalize(b), normalize(color.b), normalize(a), mode);
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return RGBA(
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to_pixel(nr),
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to_pixel(ng),
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to_pixel(nb),
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alpha
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);
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}
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private:
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static constexpr auto normalize(pixel_t p) noexcept -> float {
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return float(p) / 255;
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}
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static constexpr auto to_pixel(float p) noexcept -> pixel_t {
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return static_cast<pixel_t>(std::clamp(p, 0.f, 1.f) * 255);
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}
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static constexpr auto apply_op(pixel_t l, pixel_t r, auto&& fn) noexcept -> pixel_t {
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return RGBA::to_pixel(fn(RGBA::normalize(l), RGBA::normalize(r)));
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}
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static constexpr auto blend_helper(float bg, float fg, float alpha, BlendMode mode) noexcept -> float {
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constexpr auto mix_helper = [](float s, float b, float a) -> float {
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// (1 - αb) x Cs + αb x B(Cb, Cs)
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return (1 - a) * s + a * b;
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};
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switch (mode) {
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case BlendMode::normal: return mix_helper(bg, fg, alpha);
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case BlendMode::multiply: {
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return mix_helper(bg, bg * fg, alpha);
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}
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case BlendMode::screen: {
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constexpr auto fn = [](float b, float s) -> float {
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// Cb + Cs -(Cb x Cs)
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return b + s - (b * s);
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};
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auto bf = fn(bg, fg);
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return mix_helper(bg, bf, alpha);
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}
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case BlendMode::overlay: {
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// HardLight(Cs, Cb)
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auto hl = blend_helper(bg, fg, alpha, BlendMode::hardLight);
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return mix_helper(bg, hl, alpha);
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}
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case BlendMode::darken: return mix_helper(bg, std::min(bg, fg), alpha);
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case BlendMode::lighten: return mix_helper(bg, std::max(bg, fg), alpha);
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case BlendMode::colorDodge: {
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constexpr auto fn = [](float b, float s) -> float {
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if (b == 0) return 0;
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if (s == 255) return 255;
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return std::min(1.f, b / (1.f - s));
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};
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auto bf = fn(bg, fg);
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return mix_helper(bg, bf, alpha);
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}
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case BlendMode::colorBurn: {
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constexpr auto fn = [](float b, float s) -> float {
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if (b == 255) return 255;
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if (s == 0) return 0;
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return 1.f - std::min(1.f, (1.f - b) / s);
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};
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auto bf = fn(bg, fg);
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return mix_helper(bg, bf, alpha);
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}
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case BlendMode::hardLight: {
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constexpr auto fn = [](float b, float s, float a) -> float {
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if (s <= 0.5f) {
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return RGBA::blend_helper(b, 2.f * s, a, BlendMode::multiply);
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} else {
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return RGBA::blend_helper(b, 2.f * s - 1.f, a, BlendMode::screen);
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}
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};
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auto bf = fn(bg, fg, alpha);
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return mix_helper(bg, bf, alpha);
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}
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case BlendMode::softLight: {
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constexpr auto fn = [](float b, float s) -> float {
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if (s <= 0.5f) {
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// B(Cb, Cs) = Cb - (1 - 2 x Cs) x Cb x (1 - Cb)
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return b - (1.f - 2.f * s) * b * (1 - b);
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} else {
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float d{};
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if (b <= 0.5f) {
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// D(Cb) = ((16 * Cb - 12) x Cb + 4) x Cb
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d = ((16 * b - 12) * b + 4) * b;
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} else {
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// D(Cb) = sqrt(Cb)
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d = std::sqrt(b);
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}
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// B(Cb, Cs) = Cb + (2 x Cs - 1) x (D(Cb) - Cb)
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return b + (2 * s - 1) * (d - b);
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}
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};
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auto bf = fn(bg, fg);
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return mix_helper(bg, bf, alpha);
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}
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case BlendMode::difference: {
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// B(Cb, Cs) = | Cb - Cs |
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return mix_helper(bg, (bg > fg ? (bg - fg) : (fg - bg)), alpha);
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}
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case BlendMode::exclusion: {
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constexpr auto fn = [](float b, float s) -> float {
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// B(Cb, Cs) = Cb + Cs - 2 x Cb x Cs
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return b + s - 2 * b * s;
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};
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auto bf = fn(bg, fg);
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return mix_helper(bg, bf, alpha);
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}
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}
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}
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};
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struct HSLA {
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using pixel_t = float;
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pixel_t h{}; // hue: 0-360
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pixel_t s{}; // saturation: 0-100%
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pixel_t l{}; // lightness: 0-100%
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pixel_t a{}; // alpha: 0-100%
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constexpr HSLA() noexcept = default;
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constexpr HSLA(HSLA const&) noexcept = default;
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constexpr HSLA(HSLA &&) noexcept = default;
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constexpr HSLA& operator=(HSLA const&) noexcept = default;
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constexpr HSLA& operator=(HSLA &&) noexcept = default;
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constexpr ~HSLA() noexcept = default;
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constexpr HSLA(pixel_t h, pixel_t s, pixel_t l, pixel_t a = 100) noexcept
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: h(h)
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, s(s)
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, l(l)
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, a(a)
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{}
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constexpr HSLA(RGBA color) noexcept {
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auto tr = float(color.r) / 255;
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auto tg = float(color.g) / 255;
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auto tb = float(color.b) / 255;
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auto ta = float(color.a) / 255;
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auto min = std::min({tr, tg, tb});
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auto max = std::max({tr, tg, tb});
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auto c = max - min;
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float hue = 0;
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float s = 0;
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auto l = (max + min) / 2;
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if (!detail::compare_float(c, 0)) {
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auto temp_max = std::max({color.r, color.g, color.b});
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if (temp_max == color.r) {
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auto seg = (tg - tb) / c;
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auto shift = (seg < 0 ? 360.f : 0.f) / 60.f;
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hue = seg + shift;
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} else if (temp_max == color.g) {
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auto seg = (tb - tr) / c;
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auto shift = 120.f / 60.f;
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hue = seg + shift;
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} else {
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auto seg = (tr - tg) / c;
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auto shift = 240.f / 60.f;
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hue = seg + shift;
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}
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s = c / (1 - std::abs(2 * l - 1));
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}
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hue = hue * 60.f + 360.f;
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auto q = static_cast<float>(static_cast<int>(hue / 360.f));
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hue -= q * 360.f;
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this->h = hue;
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this->s = s * 100.f;
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this->l = l * 100.f;
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this->a = ta * 100.f;
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}
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constexpr operator RGBA() const noexcept {
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auto th = std::clamp(h, 0.f, 360.f) / 360;
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auto ts = std::clamp(s, 0.f, 100.f) / 100;
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auto tl = std::clamp(l, 0.f, 100.f) / 100;
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auto ta = std::clamp(a, 0.f, 100.f) / 100;
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if (detail::compare_float(ts, 0)) return RGBA(to_int(tl), to_int(ta));
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float const q = tl < 0.5 ? tl * (1 + ts) : tl + ts - tl * ts;
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float const p = 2 * tl - q;
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return RGBA(
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to_int(convert_hue(p, q, th + 1.f / 3)),
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to_int(convert_hue(p, q, th)),
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to_int(convert_hue(p, q, th - 1.f / 3)),
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to_int(ta)
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);
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}
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constexpr auto blend(HSLA color, BlendMode mode) const noexcept -> HSLA {
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auto lhs = RGBA(*this);
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auto rhs = RGBA(color);
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return HSLA(lhs.blend(rhs, mode));
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}
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private:
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static constexpr auto to_int(float a, float max = 1) noexcept -> std::uint8_t {
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return static_cast<std::uint8_t>((a / max) * 255);
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}
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static constexpr auto convert_hue(float p, float q, float t) noexcept -> float {
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if (t < 0) t += 1;
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if (t > 1) t -= 1;
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if (t * 6 < 1) return p + (q - p) * 6 * t;
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if (t * 2 < 1) return q;
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if (t * 3 < 2) return p + (q - p) * (2.f / 3 - t) * 6;
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return p;
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}
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};
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namespace detail {
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template <PixelFormat F>
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inline static constexpr auto parse_pixel_helper(RGBA color, std::uint8_t* out_ptr) noexcept {
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if constexpr (F == PixelFormat::rgba) {
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out_ptr[0] = color.r;
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out_ptr[1] = color.g;
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out_ptr[2] = color.b;
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out_ptr[3] = color.a;
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} else if constexpr (F == PixelFormat::abgr) {
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out_ptr[0] = color.a;
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out_ptr[1] = color.b;
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out_ptr[2] = color.g;
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out_ptr[3] = color.r;
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} else if constexpr (F == PixelFormat::rgb) {
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out_ptr[0] = color.r;
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out_ptr[1] = color.g;
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out_ptr[2] = color.b;
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} else if constexpr (F == PixelFormat::bgr) {
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out_ptr[0] = color.b;
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out_ptr[1] = color.g;
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out_ptr[2] = color.r;
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} else if constexpr (F == PixelFormat::ga) {
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out_ptr[0] = color.r;
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out_ptr[1] = color.a;
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} else if constexpr (F == PixelFormat::ag) {
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out_ptr[0] = color.a;
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out_ptr[1] = color.r;
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} else {
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out_ptr[0] = color.r;
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}
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}
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template <PixelFormat F>
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inline static constexpr auto parse_pixel_helper(std::uint8_t const* in_ptr) noexcept -> RGBA {
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if constexpr (F == PixelFormat::rgba) {
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return {
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in_ptr[0],
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in_ptr[1],
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in_ptr[2],
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in_ptr[3]
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};
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} else if constexpr (F == PixelFormat::abgr) {
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return {
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in_ptr[3],
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in_ptr[2],
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in_ptr[1],
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in_ptr[0]
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};
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} else if constexpr (F == PixelFormat::rgb) {
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return {
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in_ptr[0],
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in_ptr[1],
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in_ptr[2],
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0xff
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};
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} else if constexpr (F == PixelFormat::bgr) {
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return {
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in_ptr[2],
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in_ptr[1],
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in_ptr[0],
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0xff
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};
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} else if constexpr (F == PixelFormat::ga) {
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return {
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in_ptr[0],
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in_ptr[1],
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};
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} else if constexpr (F == PixelFormat::ag) {
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return {
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in_ptr[1],
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in_ptr[0],
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};
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} else {
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return { in_ptr[0], 0xff };
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}
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}
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} // namespace detail
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inline static constexpr auto get_pixel_format_channel(PixelFormat format) noexcept -> std::size_t {
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switch (format) {
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case PixelFormat::rgba: case PixelFormat::abgr: return 4u;
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case PixelFormat::rgb: case PixelFormat::bgr: return 3u;
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case PixelFormat::ga: case PixelFormat::ag: return 2u;
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case PixelFormat::g: return 1u;
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}
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assert(false && "unreachable");
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}
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struct PixelBuf {
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private:
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public:
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using value_type = RGBA;
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using base_type = Matrix<value_type>;
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using pointer = typename base_type::pointer;
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using const_pointer = typename base_type::const_pointer;
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using reference = typename base_type::reference;
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using const_reference = typename base_type::const_reference;
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using iterator = typename base_type::iterator;
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using const_iterator = typename base_type::const_iterator;
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using reverse_iterator = typename base_type::reverse_iterator;
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using const_reverse_iterator = typename base_type::const_reverse_iterator;
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using difference_type = typename base_type::difference_type;
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using size_type = typename base_type::size_type;
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PixelBuf(size_type r, size_type c)
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: m_data(r, c)
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{}
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PixelBuf(size_type r, size_type c, RGBA color)
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: m_data(r, c, color)
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{}
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PixelBuf(std::uint8_t const* in, size_type r, size_type c, PixelFormat format = PixelFormat::rgba)
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: PixelBuf(r, c)
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{
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assert(in != nullptr);
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switch (format) {
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case PixelFormat::rgba: from_helper<PixelFormat::rgba>(in, data(), size()); break;
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case PixelFormat::abgr: from_helper<PixelFormat::abgr>(in, data(), size()); break;
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case PixelFormat::rgb: from_helper<PixelFormat::rgb >(in, data(), size()); break;
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case PixelFormat::bgr: from_helper<PixelFormat::bgr >(in, data(), size()); break;
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case PixelFormat::ga: from_helper<PixelFormat::ga >(in, data(), size()); break;
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case PixelFormat::ag: from_helper<PixelFormat::ag >(in, data(), size()); break;
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case PixelFormat::g: from_helper<PixelFormat::g >(in, data(), size()); break;
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}
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}
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PixelBuf() noexcept = default;
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PixelBuf(PixelBuf const&) = default;
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PixelBuf(PixelBuf &&) noexcept = default;
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PixelBuf& operator=(PixelBuf const&) = default;
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PixelBuf& operator=(PixelBuf &&) noexcept = default;
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~PixelBuf() = default;
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constexpr auto size() const noexcept -> size_type { return m_data.size(); }
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constexpr auto rows() const noexcept -> size_type { return m_data.rows(); }
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constexpr auto cols() const noexcept -> size_type { return m_data.cols(); }
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constexpr auto data() noexcept -> pointer { return m_data.data(); }
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constexpr auto data() const noexcept -> const_pointer { return m_data.data(); }
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auto to_raw_buf() noexcept -> std::uint8_t* { return reinterpret_cast<std::uint8_t*>(data()); }
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auto to_raw_buf() const noexcept -> std::uint8_t const* { return reinterpret_cast<std::uint8_t const*>(data()); }
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constexpr auto raw_buf_size() const noexcept { return size() * sizeof(RGBA); }
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constexpr auto begin() noexcept -> iterator { return m_data.begin(); }
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constexpr auto end() noexcept -> iterator { return m_data.end(); }
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constexpr auto begin() const noexcept -> const_iterator { return m_data.begin(); }
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constexpr auto end() const noexcept -> const_iterator { return m_data.end(); }
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constexpr auto rbegin() noexcept -> reverse_iterator { return m_data.rbegin(); }
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constexpr auto rend() noexcept -> reverse_iterator { return m_data.rend(); }
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constexpr auto rbegin() const noexcept -> const_reverse_iterator { return m_data.rbegin(); }
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constexpr auto rend() const noexcept -> const_reverse_iterator { return m_data.rend(); }
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constexpr decltype(auto) operator[](size_type r) noexcept { return m_data[r]; }
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constexpr decltype(auto) operator[](size_type r) const noexcept { return m_data[r]; }
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constexpr auto operator()(size_type r, size_type c) noexcept -> reference { return m_data(r, c); }
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constexpr auto operator()(size_type r, size_type c) const noexcept -> const_reference { return m_data(r, c); }
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constexpr auto fill(RGBA color) noexcept -> void {
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std::fill(begin(), end(), color);
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}
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constexpr auto copy_to(std::uint8_t* out, PixelFormat format = PixelFormat::rgba) const noexcept {
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assert(out != nullptr);
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switch (format) {
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case PixelFormat::rgba: copy_to_helper<PixelFormat::rgba>(data(), out, size());return;
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case PixelFormat::abgr: copy_to_helper<PixelFormat::abgr>(data(), out, size());return;
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case PixelFormat::rgb: copy_to_helper<PixelFormat::rgb >(data(), out, size());return;
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case PixelFormat::bgr: copy_to_helper<PixelFormat::bgr >(data(), out, size());return;
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case PixelFormat::ga: copy_to_helper<PixelFormat::ga >(data(), out, size());return;
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case PixelFormat::ag: copy_to_helper<PixelFormat::ag >(data(), out, size());return;
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case PixelFormat::g: copy_to_helper<PixelFormat::g >(data(), out, size());return;
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}
|
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assert(false && "unreachable");
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|
}
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private:
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template <PixelFormat F>
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constexpr auto copy_to_helper(const_pointer in, std::uint8_t* out, size_type size) const noexcept -> void {
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constexpr auto channels = get_pixel_format_channel(F);
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for (auto i = size_type{}; i < size; ++i) {
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|
detail::parse_pixel_helper<F>(in[i], out + i * channels);
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|
}
|
|
}
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|
|
|
template <PixelFormat F>
|
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constexpr auto from_helper(std::uint8_t const* in, pointer out, size_type size) const noexcept -> void {
|
|
constexpr auto channels = get_pixel_format_channel(F);
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|
for (auto i = size_type{}; i < size; ++i) {
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|
out[i] = detail::parse_pixel_helper<F>(in + i * channels);
|
|
}
|
|
}
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|
|
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private:
|
|
base_type m_data;
|
|
};
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|
|
|
|
|
|
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} // namespace amt
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|
|
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#include <format>
|
|
namespace std {
|
|
template <>
|
|
struct formatter<amt::RGBA> {
|
|
constexpr auto parse(format_parse_context& ctx) {
|
|
return ctx.begin();
|
|
}
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|
|
|
auto format(amt::RGBA const& color, auto& ctx) const {
|
|
return format_to(ctx.out(), "rgba({}, {}, {}, {})", color.r, color.g, color.b, color.a);
|
|
}
|
|
};
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|
|
|
template <>
|
|
struct formatter<amt::HSLA> {
|
|
constexpr auto parse(format_parse_context& ctx) {
|
|
return ctx.begin();
|
|
}
|
|
|
|
auto format(amt::HSLA const& color, auto& ctx) const {
|
|
return format_to(ctx.out(), "hsla({:.1f}deg, {:.1f}%, {:.1f}%, {:.1f}%)", color.h, color.s, color.l, color.a);
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct formatter<amt::PixelBuf> {
|
|
bool hsla = false;
|
|
|
|
constexpr auto parse(format_parse_context& ctx) {
|
|
auto it = ctx.begin();
|
|
while (it != ctx.end() && *it != '}') {
|
|
if (*it == 'h') hsla = true;
|
|
++it;
|
|
}
|
|
return it;
|
|
}
|
|
|
|
auto format(amt::PixelBuf const& buf, auto& ctx) const {
|
|
std::string s = "[\n";
|
|
for (auto r = std::size_t{}; r < buf.rows(); ++r) {
|
|
for (auto c = std::size_t{}; c < buf.cols(); ++c) {
|
|
auto color = buf(r, c);
|
|
if (hsla) s += std::format("{}, ", amt::HSLA(color));
|
|
else s += std::format("{}, ", color);
|
|
}
|
|
s += '\n';
|
|
}
|
|
s += "]";
|
|
return format_to(ctx.out(), "{}", s);
|
|
}
|
|
};
|
|
} // namespace std
|
|
|
|
#endif // AMT_PIXEL_HPP
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