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/*
* Copyright (C) 2026 Linux Studio Plugins Project <https://lsp-plug.in/>
* (C) 2026 Vladimir Sadovnikov <sadko4u@gmail.com>
*
* This file is part of lsp-runtime-lib
* Created on: 05 нояб. 2015 г.
*
* lsp-runtime-lib 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
* any later version.
*
* lsp-runtime-lib 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 lsp-runtime-lib. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef LSP_PLUG_IN_RUNTIME_COLOR_H_
#define LSP_PLUG_IN_RUNTIME_COLOR_H_
#include <lsp-plug.in/common/types.h>
#include <lsp-plug.in/common/status.h>
#include <lsp-plug.in/runtime/LSPString.h>
namespace lsp
{
/**
* Color class. Represents an object that allows to work with different color models.
* Supported color models:
* - RGB (red, green, blue components)
* - HSL (hue, saturation, lightness components)
* - Alpha channel
* All components are normalzed within the [0.0f .. 1.0f] range
*/
class Color
{
protected:
enum mask_t
{
M_RGB = 1 << 0, // Standard RGB color components
M_HSL = 1 << 1, // Hue/Saturation/Lightness components
M_XYZ = 1 << 2, // CIE XYZ components
M_LAB = 1 << 3, // CIE LAB D65 standard components
M_LCH = 1 << 4, // CIE LCH D65 standard components
M_CMYK = 1 << 5, // CMYK color space
};
typedef struct rgb_t
{
float R, G, B;
} rgb_t;
typedef struct hsl_t
{
float H, S, L;
} hsl_t;
typedef struct xyz_t
{
float X, Y, Z;
} xyz_t;
typedef struct lab_t
{
float L, A, B;
} lab_t;
typedef struct lch_t
{
float L, C, H;
} lch_t;
typedef struct cmyk_t
{
float C, M, Y, K;
} cmyk_t;
protected:
mutable rgb_t rgb;
mutable hsl_t hsl;
mutable xyz_t xyz;
mutable lab_t lab;
mutable lch_t lch;
mutable cmyk_t cmyk;
mutable size_t mask;
mutable float A;
rgb_t &calc_rgb() const noexcept;
hsl_t &calc_hsl() const noexcept;
xyz_t &calc_xyz() const noexcept;
lab_t &calc_lab() const noexcept;
lch_t &calc_lch() const noexcept;
cmyk_t &calc_cmyk() const noexcept;
bool hsl_to_rgb() const noexcept;
bool xyz_to_rgb() const noexcept;
bool lab_to_xyz() const noexcept;
bool lch_to_lab() const noexcept;
bool cmyk_to_rgb() const noexcept;
protected:
static status_t parse_hex(float *dst, size_t n, char prefix, const char *src, size_t len) noexcept;
static status_t parse_numeric(float *dst, size_t nmin, size_t nmax, const char *prefix, const char *src, size_t len) noexcept;
static status_t parse_cnumeric(float *dst, size_t nmin, size_t nmax, const char *prefix, const char *src, size_t len) noexcept;
static ssize_t format(char *dst, size_t len, size_t tolerance, const float *v, char prefix, bool alpha) noexcept;
static inline float clamp(float x) noexcept;
// Construction and destruction
public:
Color() noexcept;
explicit Color(const Color &src) noexcept;
explicit Color(const Color *src) noexcept;
Color(Color &&src) noexcept;
explicit Color(uint32_t rgb) noexcept;
Color(float r, float g, float b) noexcept;
Color(float r, float g, float b, float a) noexcept;
Color(const Color &src, float a) noexcept;
Color(const Color *src, float a) noexcept;
Color(uint32_t rgb, float a) noexcept;
Color &operator = (const Color & src) noexcept;
Color &operator = (Color && src) noexcept;
// Copying and swapping
public:
Color ©(const Color &c) noexcept;
Color ©(const Color *c) noexcept;
Color ©(const Color &c, float a) noexcept;
Color ©(const Color *c, float a) noexcept;
void swap(Color *src) noexcept;
inline void swap(Color &src) noexcept { swap(&src); }
// RGB-related functions
public:
// Check that RGB data is currently present without need of implicit conversion
inline bool is_rgb() const noexcept { return mask & M_RGB; }
// Get color components
inline float red() const noexcept { return calc_rgb().R; }
inline float green() const noexcept { return calc_rgb().G; }
inline float blue() const noexcept { return calc_rgb().B; }
const Color &get_rgb(float &r, float &g, float &b) const noexcept;
Color &get_rgb(float &r, float &g, float &b) noexcept;
const Color &get_rgba(float &r, float &g, float &b, float &a) const noexcept;
const Color &get_rgbo(float &r, float &g, float &b, float &o) const noexcept;
Color &get_rgba(float &r, float &g, float &b, float &a) noexcept;
uint32_t rgb24() const noexcept;
/**
* Get RGBA color where fully transparent alpha is 0xff and fully
* opaque alpha is 0xff.
* @return RGBA32 color in format 0xAARRGGBB
*/
uint32_t rgba32() const noexcept;
/**
* Get device RGBA color where fully transparent alpha is 0
* and fully opaqe alpha is 0xff.
* @return RGBA32 color in device format 0xAARRGGBB
*/
uint32_t dev_rgba32() const noexcept;
/**
* Get pre-multiplied RGBA color where fully transparent alpha is 0
* and fully opaqe alpha is 0xff.
* @return premultiplied RGBA32 color in format 0xAARRGGBB
*/
uint32_t prgba32() const noexcept;
// Update color components
Color &red(float r) noexcept;
Color &green(float g) noexcept;
Color &blue(float b) noexcept;
Color &set_rgb(float r, float g, float b) noexcept;
Color &set_rgba(float r, float g, float b, float a) noexcept;
Color &set_rgb24(uint32_t v) noexcept;
Color &set_rgba32(uint32_t v) noexcept;
Color &set_prgba32(uint32_t v) noexcept;
Color &set_dev_rgba32(uint32_t v) noexcept;
// Formatting
ssize_t format_rgb(char *dst, size_t len, size_t tolerance = 2) const noexcept;
ssize_t format_rgb(LSPString *dst, size_t tolerance = 2) const noexcept;
ssize_t format_rgba(char *dst, size_t len, size_t tolerance = 2) const noexcept;
ssize_t format_rgba(LSPString *dst, size_t tolerance = 2) const noexcept;
// Parsing
status_t parse_rgb(const char *src, size_t len) noexcept;
status_t parse_rgb(const char *src) noexcept;
status_t parse_rgb(const LSPString *src, size_t len) noexcept { return parse_rgb(src->get_utf8(0, len)); }
status_t parse_rgb(const LSPString *src) noexcept { return parse_rgb(src->get_utf8()); }
status_t parse_rgba(const char *src, size_t len) noexcept;
status_t parse_rgba(const char *src) noexcept;
status_t parse_rgba(const LSPString *src, size_t len) noexcept { return parse_rgba(src->get_utf8(0, len)); }
status_t parse_rgba(const LSPString *src) noexcept { return parse_rgba(src->get_utf8()); }
// HSL-related functions
public:
// Check that HSL data is currently present without need of implicit conversion
inline bool is_hsl() const noexcept { return mask & M_HSL; }
// Get color components
inline float hue() const noexcept { return calc_hsl().H; }
inline float saturation() const noexcept { return calc_hsl().S; }
inline float lightness() const noexcept { return calc_hsl().L; }
inline float hsl_hue() const noexcept { return calc_hsl().H; }
inline float hsl_saturation() const noexcept { return calc_hsl().S; }
inline float hsl_lightness() const noexcept { return calc_hsl().L; }
const Color &get_hsl(float &h, float &s, float &l) const noexcept;
Color &get_hsl(float &h, float &s, float &l) noexcept;
const Color &get_hsla(float &h, float &s, float &l, float &a) const noexcept;
Color &get_hsla(float &h, float &s, float &l, float &a) noexcept;
uint32_t hsl24() const noexcept;
uint32_t hsla32() const noexcept;
// Update color components
Color &hue(float h) noexcept;
Color &saturation(float s) noexcept;
Color &lightness(float l) noexcept;
Color &hsl_hue(float h) noexcept;
Color &hsl_saturation(float s) noexcept;
Color &hsl_lightness(float l) noexcept;
Color &set_hsl(float h, float s, float l) noexcept;
Color &set_hsla(float h, float s, float l, float a) noexcept;
Color &set_hsl24(uint32_t v) noexcept;
Color &set_hsla32(uint32_t v) noexcept;
// Formatting
ssize_t format_hsl(char *dst, size_t len, size_t tolerance = 2) const noexcept;
ssize_t format_hsl(LSPString *dst, size_t tolerance = 2) const noexcept;
ssize_t format_hsla(char *dst, size_t len, size_t tolerance = 2) const noexcept;
ssize_t format_hsla(LSPString *dst, size_t tolerance = 2) const noexcept;
// Parsing
status_t parse_hsl(const char *src, size_t len) noexcept;
status_t parse_hsl(const char *src) noexcept;
status_t parse_hsl(const LSPString *src, size_t len) noexcept { return parse_hsl(src->get_utf8(0, len)); }
status_t parse_hsl(const LSPString *src) noexcept { return parse_hsl(src->get_utf8()); }
status_t parse_hsla(const char *src, size_t len) noexcept;
status_t parse_hsla(const char *src) noexcept;
status_t parse_hsla(const LSPString *src, size_t len) noexcept { return parse_hsla(src->get_utf8(0, len)); }
status_t parse_hsla(const LSPString *src) noexcept { return parse_hsla(src->get_utf8()); }
// CIE XYZ-related functions (D65 standard)
public:
// Check that XYZ data is currently present without need of implicit conversion
inline bool is_xyz() const noexcept { return mask & M_XYZ; }
// Get color components
inline float xyz_x() const noexcept { return calc_xyz().X; }
inline float xyz_y() const noexcept { return calc_xyz().Y; }
inline float xyz_z() const noexcept { return calc_xyz().Z; }
const Color &get_xyz(float &x, float &y, float &z) const noexcept;
Color &get_xyz(float &x, float &y, float &z) noexcept;
const Color &get_xyza(float &x, float &y, float &z, float &a) const noexcept;
Color &get_xyza(float &x, float &y, float &z, float &a) noexcept;
// Update color components
Color &xyz_x(float x) noexcept;
Color &xyz_y(float y) noexcept;
Color &xyz_z(float z) noexcept;
Color &set_xyz(float x, float y, float z) noexcept;
Color &set_xyza(float x, float y, float z, float a) noexcept;
// CIE LAB-related functions (D65 standard)
public:
// Check that LAB data is currently present without need of implicit conversion
inline bool is_lab() const noexcept { return mask & M_LAB; }
// Get color components
inline float lab_l() const noexcept { return calc_lab().L; }
inline float lab_a() const noexcept { return calc_lab().A; }
inline float lab_b() const noexcept { return calc_lab().B; }
const Color &get_lab(float &l, float &a, float &b) const noexcept;
Color &get_lab(float &l, float &a, float &b) noexcept;
const Color &get_laba(float &l, float &a, float &b, float &alpha) const noexcept;
Color &get_laba(float &l, float &a, float &b, float &alpha) noexcept;
// Update color components
Color &lab_l(float l) noexcept;
Color &lab_a(float a) noexcept;
Color &lab_b(float b) noexcept;
Color &set_lab(float l, float a, float b) noexcept;
Color &set_laba(float l, float a, float b, float alpha) noexcept;
// CIE LCH-related functions (D65 standard)
public:
// Check that LCH data is currently present without need of implicit conversion
inline bool is_lch() const noexcept { return mask & M_LCH; }
inline bool is_hcl() const noexcept { return mask & M_LCH; }
// Get color components
inline float lch_l() const noexcept { return calc_lch().L; }
inline float lch_c() const noexcept { return calc_lch().C; }
inline float lch_h() const noexcept { return calc_lch().H; }
inline float hcl_l() const noexcept { return calc_lch().L; }
inline float hcl_c() const noexcept { return calc_lch().C; }
inline float hcl_h() const noexcept { return calc_lch().H; }
const Color &get_lch(float &l, float &c, float &h) const noexcept;
Color &get_lch(float &l, float &c, float &h) noexcept;
const Color &get_lcha(float &l, float &c, float &h, float &alpha) const noexcept;
Color &get_lcha(float &l, float &c, float &h, float &alpha) noexcept;
const Color &get_hcl(float &h, float &c, float &l) const noexcept;
Color &get_hcl(float &h, float &c, float &l) noexcept;
const Color &get_hcla(float &h, float &c, float &l, float &alpha) const noexcept;
Color &get_hcla(float &h, float &c, float &l, float &alpha) noexcept;
// Update color components
Color &lch_l(float l) noexcept;
Color &lch_c(float c) noexcept;
Color &lch_h(float h) noexcept;
Color &hcl_l(float l) noexcept;
Color &hcl_c(float c) noexcept;
Color &hcl_h(float h) noexcept;
Color &set_lch(float l, float c, float h) noexcept;
Color &set_lcha(float l, float c, float h, float alpha) noexcept;
Color &set_hcl(float h, float c, float l) noexcept;
Color &set_hcla(float h, float c, float l, float alpha) noexcept;
// CMYK color space
public:
inline bool is_cmyk() const noexcept { return mask & M_CMYK; }
inline float cyan() const noexcept { return calc_cmyk().C; }
inline float magenta() const noexcept { return calc_cmyk().M; }
inline float yellow() const noexcept { return calc_cmyk().Y; }
inline float black() const noexcept { return calc_cmyk().K; }
const Color &get_cmyk(float &c, float &m, float &y, float &k) const noexcept;
Color &get_cmyk(float &c, float &m, float &y, float &k) noexcept;
const Color &get_cmyka(float &c, float &m, float &y, float &k, float &alpha) const noexcept;
Color &get_cmyka(float &c, float &m, float &y, float &k, float &alpha) noexcept;
// Update color components
Color &cyan(float c) noexcept;
Color &magenta(float m) noexcept;
Color &yellow(float y) noexcept;
Color &black(float k) noexcept;
Color &set_cmyk(float c, float m, float y, float k) noexcept;
Color &set_cmyka(float c, float m, float y, float k, float alpha) noexcept;
// Alpha-blending channel
public:
inline float alpha() const noexcept { return A; }
inline float opacity() const noexcept { return 1.0f - A; }
inline float dev_alpha() const noexcept { return 1.0f - A; }
Color &alpha(float a) noexcept;
Color &opacity(float o) noexcept;
// Parsing
public:
// Parsing raw data
status_t parse3(const char *src, size_t len) noexcept;
status_t parse3(const char *src) noexcept;
status_t parse4(const char *src, size_t len) noexcept;
status_t parse4(const char *src) noexcept;
status_t parse(const char *src, size_t len) noexcept;
status_t parse(const char *src) noexcept;
// Parsing LSPString
inline status_t parse3(const LSPString *src, size_t len) noexcept { return parse3(src->get_utf8(0, len)); }
inline status_t parse3(const LSPString *src) noexcept { return parse3(src->get_utf8()); }
inline status_t parse4(const LSPString *src, size_t len) noexcept { return parse4(src->get_utf8(0, len)); }
inline status_t parse4(const LSPString *src) noexcept { return parse4(src->get_utf8()); }
// Formatting data
ssize_t format3(char *dst, size_t len) const noexcept;
ssize_t format3(LSPString *dst) const noexcept;
ssize_t format4(char *dst, size_t len) const noexcept;
ssize_t format4(LSPString *dst) const noexcept;
// Miscellaneous effects
public:
Color &blend(const Color &c, float alpha) noexcept;
Color &blend(float r, float g, float b, float alpha) noexcept;
Color &darken(float amount) noexcept;
Color &lighten(float amount) noexcept;
Color &blend(const Color &c1, const Color &c2, float alpha) noexcept;
void scale_hsl_lightness(float amount) noexcept;
void scale_lch_luminance(float amount) noexcept;
};
} /* namespace lsp */
#endif /* LSP_PLUG_IN_RUNTIME_COLOR_H_ */
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