epaper::RGBA Struct Reference

#include <color.hpp>

Public Member Functions
constexpr	RGBA ()
	Default constructor initializes to transparent black.
constexpr	RGBA (std::uint8_t red, std::uint8_t green, std::uint8_t blue, std::uint8_t alpha=255)
	Construct RGBA color from components.
constexpr	RGBA (const RGB &rgb)
	Construct RGBA from RGB (fully opaque).
constexpr auto	operator== (const RGBA &other) const noexcept -> bool=default
	Equality comparison.
constexpr auto	to_rgb () const noexcept -> RGB
	Convert to RGB (discards alpha channel).
constexpr auto	to_grayscale () const noexcept -> std::uint8_t
	Convert to grayscale using standard luminance formula.

Public Attributes
std::uint8_t	a
	Alpha component (0-255, 0=transparent, 255=opaque)
std::uint8_t	b
	Blue component (0-255)
std::uint8_t	g
	Green component (0-255)
std::uint8_t	r
	Red component (0-255)

Constructor & Destructor Documentation

RGBA() [1/3]

constexpr epaper::RGBA::RGBA ( )

inlineconstexpr

Default constructor initializes to transparent black.

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

RGBA() [2/3]

constexpr epaper::RGBA::RGBA ( std::uint8_t  red, std::uint8_t  green, std::uint8_t  blue, std::uint8_t  alpha = 255  )

inlineconstexpr

Construct RGBA color from components.

Parameters

red	Red component (0-255)
green	Green component (0-255)
blue	Blue component (0-255)
alpha	Alpha component (0-255, default 255=opaque)

RGBA() [3/3]

constexpr epaper::RGBA::RGBA ( const RGB &  rgb )

inlineexplicitconstexpr

Construct RGBA from RGB (fully opaque).

Parameters

rgb

RGB color

Member Function Documentation

operator==()

constexpr auto epaper::RGBA::operator== ( const RGBA &  other ) const -> bool=default

constexprdefaultnoexcept

Equality comparison.

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

to_grayscale()

constexpr auto epaper::RGBA::to_grayscale ( ) const -> std::uint8_t

inlineconstexprnoexcept

Convert to grayscale using standard luminance formula.

Returns

Grayscale value (0-255)

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

to_rgb()

constexpr auto epaper::RGBA::to_rgb ( ) const -> RGB

inlineconstexprnoexcept

Convert to RGB (discards alpha channel).

Returns

RGB color

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

Member Data Documentation

a

std::uint8_t epaper::RGBA::a

Alpha component (0-255, 0=transparent, 255=opaque)

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

b

std::uint8_t epaper::RGBA::b

Blue component (0-255)

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

g

std::uint8_t epaper::RGBA::g

Green component (0-255)

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

r

std::uint8_t epaper::RGBA::r

Red component (0-255)

Examples

/mnt/nas/libepaper/include/epaper/color/color.hpp.

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The documentation for this struct was generated from the following file:

• include/epaper/color/color.hpp