sbl::components::display Namespace Reference

Display output components. More...

Classes
struct	Rgb
	Simple 8-bit RGB color triple. Aggregate — constexpr constructible. More...
class	RgbLed
	RGB LED state holder with 8-bit per-channel duty cycle. More...
struct	RgbLedState

Enumerations
enum class	Color : uint8_t {   Off = 0 , Blue = 1 , Green = 2 , Cyan = 3 ,   Red = 4 , Magenta = 5 , Yellow = 6 , White = 7 }
	3-bit color enum — all 8 RGB combinations More...

Functions
Rgb	gamma_correct (const Rgb &c)
	Apply gamma correction to an RGB color.
Rgb	rgb_lerp (const Rgb &a, const Rgb &b, uint8_t t)
	Linear interpolation between two colors. t=0 → a, t=255 → b.
Rgb	rgb_scale (const Rgb &c, uint8_t brightness)
	Scale a color by brightness (0-255). 255 = full, 128 ≈ half, 0 = off.
Rgb	gradient (const Rgb *stops, uint8_t n_stops, uint16_t position)
	Evaluate a multi-stop color gradient at a position.

Variables
constexpr uint8_t	GAMMA8 [256]

Detailed Description

Display output components.

• RgbLed - Color enum (3-bit bang-bang) + uint8_t RGB duty

Enumeration Type Documentation

Color

enum class sbl::components::display::Color : uint8_t

strong

3-bit color enum — all 8 RGB combinations

Bit layout: [R:G:B] where bit 2=R, bit 1=G, bit 0=B. Maps to full brightness (255) per active channel.

Enumerator
Off
Blue
Green
Cyan
Red
Magenta
Yellow
White

Definition at line 34 of file rgb_led.hpp.

Function Documentation

gamma_correct()

Rgb sbl::components::display::gamma_correct ( const Rgb &  c )

inline

Apply gamma correction to an RGB color.

Definition at line 60 of file color.hpp.

References sbl::components::display::Rgb::b, sbl::components::display::Rgb::g, GAMMA8, and sbl::components::display::Rgb::r.

gradient()

Rgb sbl::components::display::gradient ( const Rgb *  stops, uint8_t  n_stops, uint16_t  position  )

inline

Evaluate a multi-stop color gradient at a position.

Divides the 0-65535 range into (n_stops - 1) equal segments and interpolates between adjacent stops. Endpoints are exact.

Parameters

stops	Array of color stops (at least 2).
n_stops	Number of stops (2-16).
position	Position in gradient (0 = first stop, 65535 = last stop).

Example: constexpr Rgb stops[] = {{0,0,255}, {0,255,0}, {255,0,0}}; Rgb c = gradient(stops, 3, 32768); // midpoint → green

Definition at line 95 of file color.hpp.

References rgb_lerp().

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rgb_lerp()

Rgb sbl::components::display::rgb_lerp ( const Rgb &  a, const Rgb &  b, uint8_t  t  )

inline

Linear interpolation between two colors. t=0 → a, t=255 → b.

Definition at line 65 of file color.hpp.

References sbl::components::display::Rgb::b, sbl::components::display::Rgb::g, and sbl::components::display::Rgb::r.

Referenced by gradient().

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rgb_scale()

Rgb sbl::components::display::rgb_scale ( const Rgb &  c, uint8_t  brightness  )

inline

Scale a color by brightness (0-255). 255 = full, 128 ≈ half, 0 = off.

Definition at line 73 of file color.hpp.

References sbl::components::display::Rgb::b, sbl::components::display::Rgb::g, and sbl::components::display::Rgb::r.

Variable Documentation

GAMMA8

constexpr uint8_t sbl::components::display::GAMMA8[256]

inlineconstexpr

Initial value:

= {
      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,
      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,
      1,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,
      2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,  4,  5,  5,  5,
      5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  9,  9,  9, 10,
     10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16,
     17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25,
     25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36,
     37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50,
     51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68,
     69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89,
     90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114,
    115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142,
    144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175,
    177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213,
    215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255,
}

Gamma correction LUT (gamma 2.8). Maps perceived-linear 0-255 to PWM duty. Without correction, PWM 128 appears ~78% as bright as 255 (not 50%).

Definition at line 40 of file color.hpp.

Referenced by gamma_correct().