bevy_ratatui_camera 0.16.0

A bevy plugin for rendering your bevy app to the terminal using ratatui.
Documentation 
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use image::{DynamicImage, GenericImageView};
use ratatui::prelude::*;

use crate::RatatuiCameraEdgeDetection;
use crate::camera_strategy::HalfBlocksConfig;
use crate::color_support::color_for_color_support;
use crate::widget_depth_buffer::RatatuiCameraDepthBuffer;
use crate::widget_utilities::{
    colors_for_color_choices, coords_from_index, replace_detected_edges,
};

#[derive(Debug)]
pub struct RatatuiCameraWidgetHalf<'a> {
    camera_image: DynamicImage,
    depth_image: Option<DynamicImage>,
    sobel_image: Option<DynamicImage>,
    depth_buffer: Option<&'a mut RatatuiCameraDepthBuffer>,
    strategy_config: &'a HalfBlocksConfig,
    edge_detection: &'a Option<RatatuiCameraEdgeDetection>,
}

impl<'a> RatatuiCameraWidgetHalf<'a> {
    pub fn new(
        camera_image: DynamicImage,
        depth_image: Option<DynamicImage>,
        sobel_image: Option<DynamicImage>,
        depth_buffer: Option<&'a mut RatatuiCameraDepthBuffer>,
        strategy_config: &'a HalfBlocksConfig,
        edge_detection: &'a Option<RatatuiCameraEdgeDetection>,
    ) -> Self {
        Self {
            camera_image,
            depth_image,
            sobel_image,
            depth_buffer,
            strategy_config,
            edge_detection,
        }
    }
}

impl Widget for &mut RatatuiCameraWidgetHalf<'_> {
    fn render(self, area: Rect, buf: &mut Buffer) {
        let cell_candidates =
            convert_image_to_cell_candidates(&self.camera_image, self.strategy_config);

        for (index, (mut bg, mut fg)) in cell_candidates.enumerate() {
            let mut character = '▄';
            let (x, y) = coords_from_index(index, &self.camera_image);

            if x >= area.width || y >= area.height {
                continue;
            }

            let Some(cell) = buf.cell_mut((area.x + x, area.y + y)) else {
                continue;
            };

            let (draw_bg, draw_fg) = if let (Some(depth_image), Some(depth_buffer)) =
                (&self.depth_image, &mut self.depth_buffer)
            {
                let draw_bg = depth_buffer
                    .compare_and_update_from_image(x as u32, y as u32 * 2, depth_image)
                    .is_some_and(|draw| draw);
                let draw_fg = depth_buffer
                    .compare_and_update_from_image(x as u32, y as u32 * 2 + 1, depth_image)
                    .is_some_and(|draw| draw);

                (draw_bg, draw_fg)
            } else {
                (true, true)
            };

            if let (Some(sobel_image), Some(edge_detection)) =
                (&self.sobel_image, self.edge_detection)
            {
                if !sobel_image.in_bounds(x as u32, y as u32) {
                    continue;
                }

                let sobel_value = sobel_image.get_pixel(x as u32, y as u32 * 2);

                (character, fg) =
                    replace_detected_edges(character, fg, &sobel_value, edge_detection);
            };

            (fg, bg) = colors_for_color_choices(
                fg,
                bg,
                &self.strategy_config.colors.foreground,
                &self.strategy_config.colors.background,
            );

            if draw_bg {
                bg = color_for_color_support(bg, self.strategy_config.colors.support);
                bg.map(|bg| cell.set_bg(bg));
            };

            if draw_fg {
                fg = color_for_color_support(fg, self.strategy_config.colors.support);
                fg.map(|fg| cell.set_fg(fg).set_char(character));
            };
        }
    }
}

fn convert_image_to_cell_candidates(
    camera_image: &DynamicImage,
    strategy_config: &HalfBlocksConfig,
) -> impl Iterator<Item = (Option<Color>, Option<Color>)> {
    let rgba_quads = convert_image_to_rgba_quads(camera_image);

    rgba_quads.into_iter().map(move |rgbas| {
        let bg = if strategy_config.common.transparent && rgbas[0][3] == 0 {
            None
        } else {
            Some(Color::Rgb(rgbas[0][0], rgbas[0][1], rgbas[0][2]))
        };
        let fg = if strategy_config.common.transparent && rgbas[1][3] == 0 {
            None
        } else {
            Some(Color::Rgb(rgbas[1][0], rgbas[1][1], rgbas[1][2]))
        };

        (bg, fg)
    })
}

fn convert_image_to_rgba_quads(camera_image: &DynamicImage) -> Vec<[[u8; 4]; 2]> {
    let mut rgba_quad_pairs =
        vec![[[0; 4]; 2]; (camera_image.width() * camera_image.height().div_ceil(2)) as usize];

    for (y, row) in camera_image.to_rgba8().rows().enumerate() {
        for (x, pixel) in row.enumerate() {
            let position = x + (camera_image.width() as usize) * (y / 2);
            if y % 2 == 0 {
                rgba_quad_pairs[position][0] = pixel.0;
            } else {
                rgba_quad_pairs[position][1] = pixel.0;
            }
        }
    }

    rgba_quad_pairs
}