gigawidgets/half__grayscale__v_8hpp_source.html

#pragma once


#include "../core/color.hpp"

#include "../core/coords.hpp"

#include "../core/size.hpp"


namespace ui {

namespace shader {


color_t halfGrayscaleV(color_t pixel, const Coords &coords, const Size &size) {

    if (coords.x <= size.x / 2) {

        return pixel;

    }


    float r, g, b;

    colorComponents(pixel, r, g, b);


    float gray = r * 0.299 + g * 0.587 + b * 0.113;

    return color(gray, gray, gray);

}


} // namespace shader

} // namespace ui

ui::color
constexpr color_t color(const float red, const float green, const float blue)
Convert normalized color components into an RGB565 value.
Definition color.hpp:31

ui::colorComponents
void colorComponents(color_t color, float &red, float &green, float &blue)
Split an RGB565 color value into normalized components.

ui::color_t
uint16_t color_t
An RGB565 color value. 5 bits red, 6 bits green, 5 bits blue.
Definition color.hpp:13

ui::shader::halfGrayscaleV
color_t halfGrayscaleV(color_t pixel, const Coords &coords, const Size &size)
A pixel shader that converts the right half of an image to grayscale.
Definition half_grayscale_v.hpp:17

ui::Coords
A struct for storing the pixel coordinates of various UI elements.
Definition coords.hpp:17

ui::Coords::x
coord_t x
The horizontal coordinate.
Definition coords.hpp:19

ui::Size
A struct that holds the number of pixels that a widget would take up on the screen.
Definition size.hpp:17

ui::Size::x
uisize_t x
The width of the widget.
Definition size.hpp:19