tt::color Class Reference

#include <ttauri/color/color.hpp>

Public Member Functions
constexpr	color (color const &) noexcept=default
constexpr	color (color &&) noexcept=default
constexpr color &	operator= (color const &) noexcept=default
constexpr color &	operator= (color &&) noexcept=default
constexpr	color (f32x4 other) noexcept
constexpr	operator f32x4 () const noexcept
constexpr	color (float r, float g, float b, float a=1.0) noexcept
constexpr float &	r () noexcept
constexpr float &	g () noexcept
constexpr float &	b () noexcept
constexpr float &	a () noexcept
constexpr float const &	r () const noexcept
constexpr float const &	g () const noexcept
constexpr float const &	b () const noexcept
constexpr float const &	a () const noexcept
constexpr bool	is_valid () const noexcept

Static Public Member Functions
static constexpr color	transparent () noexcept

Friends
constexpr friend bool	operator== (color const &lhs, color const &rhs) noexcept
constexpr friend color	operator* (color const &lhs, color const &rhs) noexcept
constexpr friend color	composit (color const &lhs, color const &rhs) noexcept

Detailed Description

This is a RGBA floating point color.

The color can be converted between different color spaces using the matrix-class.

But in most cases in the application and ttauri library this color would be in the esRGBA color space. This color space is compatible with the sRGB standard IEC 61966-2-1:1999.

esRGB details:

• the ITU-R BT.709 color primaries.
• A linear transfer function (unlike sRGB).
• R=0.0, G=0.0, B=0.0: Black
• R=1.0, G=1.0, B=1.0: White D65 at 80 nits (80 cd/m^2).
• RGB values above 1.0 are allowed for HDR (high dynamic range)
• RGB values below 0.0 are allowed for WCG (wide color gamut)

esRGBA details:

• Includes an alpha value
• Alpha values are linear and must be between 0.0 through 1.0.
• A=0.0 fully transparent
• A=1.0 fully opaque
• RGB values are NOT pre-multiplied with the alpha value.

This color format is inspired by scRGB, however scRGB only describes a 12- or 16-bit integer per component encoding of RGB values between -0.5 and 7.5.

It is also inspired by Apple's extended sRGB format.

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

• hikogui/src/ttauri/color/color.hpp