testty 0.11.1

//! Native frame renderer producing pixel-accurate terminal images.
//!
//! Converts a [`TerminalFrame`] into an [`RgbaImage`] using an embedded
//! 8x16 monospace bitmap font. This removes the VHS dependency for core
//! proof generation and is significantly faster than external tools.
//!
//! The renderer covers ASCII printable characters (0x20-0x7E) and Unicode
//! box-drawing characters (U+2500-U+257F). Characters outside these ranges
//! are rendered as a placeholder glyph.

use image::{Rgba, RgbaImage};

use crate::frame::{CellColor, CellStyle, TerminalFrame};

/// Width of each character cell in pixels.
const CELL_WIDTH: u32 = 8;

/// Height of each character cell in pixels.
const CELL_HEIGHT: u32 = 16;

/// Default foreground color (light gray) used when the terminal reports
/// the default color.
const DEFAULT_FG: CellColor = CellColor {
    red: 204,
    green: 204,
    blue: 204,
};

/// Default background color (near-black) used when the terminal reports
/// the default color.
const DEFAULT_BG: CellColor = CellColor {
    red: 30,
    green: 30,
    blue: 30,
};

/// Render a [`TerminalFrame`] to a pixel image.
///
/// Produces an [`RgbaImage`] of dimensions `(cols * 8, rows * 16)` pixels
/// using the embedded bitmap font. Each terminal cell is rendered with its
/// foreground/background color and style modifiers.
pub(crate) fn render_to_image(frame: &TerminalFrame) -> RgbaImage {
    let image_width = u32::from(frame.cols()) * CELL_WIDTH;
    let image_height = u32::from(frame.rows()) * CELL_HEIGHT;
    let mut image = RgbaImage::from_pixel(image_width, image_height, color_to_rgba(DEFAULT_BG));

    for row in 0..frame.rows() {
        for col in 0..frame.cols() {
            let foreground = frame.fg_color(row, col).unwrap_or(DEFAULT_FG);
            let background = frame.bg_color(row, col).unwrap_or(DEFAULT_BG);
            let style = frame.cell_style(row, col).unwrap_or_default();

            let cell_text = cell_text_at(frame, row, col);
            let character = cell_text.chars().next().unwrap_or(' ');

            render_cell(
                &mut image,
                u32::from(col) * CELL_WIDTH,
                u32::from(row) * CELL_HEIGHT,
                character,
                foreground,
                background,
                style,
            );
        }
    }

    image
}

/// Extract the text content of a single cell from the frame.
///
/// Delegates to [`TerminalFrame::cell_text()`] which avoids the region
/// overhead of [`TerminalFrame::text_in_region()`].
fn cell_text_at(frame: &TerminalFrame, row: u16, col: u16) -> &str {
    frame.cell_text(row, col)
}

/// Render a single terminal cell into the image at the given pixel offset.
///
/// Handles style modifiers: bold (brighter foreground), inverse (swap
/// fg/bg), underline (1px bottom-edge line), and dim (darker foreground).
fn render_cell(
    image: &mut RgbaImage,
    pixel_x: u32,
    pixel_y: u32,
    character: char,
    foreground: CellColor,
    background: CellColor,
    style: CellStyle,
) {
    let (text_color, fill_color) = if style.inverse() {
        (background, foreground)
    } else {
        (foreground, background)
    };

    let final_fg = apply_brightness(text_color, style);
    let bg_rgba = color_to_rgba(fill_color);
    let fg_rgba = color_to_rgba(final_fg);

    // Fill background.
    fill_rect(image, pixel_x, pixel_y, CELL_WIDTH, CELL_HEIGHT, bg_rgba);

    // Draw character glyph.
    let glyph = lookup_glyph(character);
    draw_glyph(image, pixel_x, pixel_y, glyph, fg_rgba);

    // Underline: 1px line at the bottom edge.
    if style.underline() {
        let underline_y = pixel_y + CELL_HEIGHT - 1;
        for offset_x in 0..CELL_WIDTH {
            let target_x = pixel_x + offset_x;
            if target_x < image.width() && underline_y < image.height() {
                image.put_pixel(target_x, underline_y, fg_rgba);
            }
        }
    }
}

/// Apply brightness adjustments based on style flags.
///
/// Bold increases brightness by ~40%, dim decreases by ~40%.
fn apply_brightness(color: CellColor, style: CellStyle) -> CellColor {
    if style.bold() {
        CellColor::new(
            brighten_component(color.red),
            brighten_component(color.green),
            brighten_component(color.blue),
        )
    } else if style.dim() {
        CellColor::new(
            dim_component(color.red),
            dim_component(color.green),
            dim_component(color.blue),
        )
    } else {
        color
    }
}

/// Increase a color component by ~40%, clamped to 255.
fn brighten_component(value: u8) -> u8 {
    let brightened = u16::from(value) * 140 / 100;

    u8::try_from(brightened.min(255)).unwrap_or(255)
}

/// Decrease a color component by ~40%.
fn dim_component(value: u8) -> u8 {
    let dimmed = u16::from(value) * 60 / 100;

    u8::try_from(dimmed).unwrap_or(0)
}

/// Fill a rectangular region with a solid color.
fn fill_rect(
    image: &mut RgbaImage,
    start_x: u32,
    start_y: u32,
    width: u32,
    height: u32,
    color: Rgba<u8>,
) {
    for offset_y in 0..height {
        for offset_x in 0..width {
            let target_x = start_x + offset_x;
            let target_y = start_y + offset_y;
            if target_x < image.width() && target_y < image.height() {
                image.put_pixel(target_x, target_y, color);
            }
        }
    }
}

/// Draw a bitmap glyph at the given pixel position.
fn draw_glyph(
    image: &mut RgbaImage,
    pixel_x: u32,
    pixel_y: u32,
    glyph: &[u8; 16],
    color: Rgba<u8>,
) {
    for (glyph_row, &byte) in glyph.iter().enumerate() {
        let row_offset = u32::try_from(glyph_row).unwrap_or(0);
        for bit in 0..8u32 {
            if byte & (0x80 >> bit) != 0 {
                let target_x = pixel_x + bit;
                let target_y = pixel_y + row_offset;
                if target_x < image.width() && target_y < image.height() {
                    image.put_pixel(target_x, target_y, color);
                }
            }
        }
    }
}

/// Convert a [`CellColor`] to an [`Rgba`] pixel.
fn color_to_rgba(color: CellColor) -> Rgba<u8> {
    Rgba([color.red, color.green, color.blue, 255])
}

// ── Embedded bitmap font ──────────────────────────────────────────────

/// Empty glyph used as a fallback for unsupported characters.
const EMPTY_GLYPH: [u8; 16] = [0; 16];

/// Look up the 8x16 bitmap glyph for a character.
///
/// Returns the glyph for ASCII printable (0x20-0x7E) and box-drawing
/// (U+2500-U+257F) characters. All other characters get an empty glyph.
fn lookup_glyph(character: char) -> &'static [u8; 16] {
    let code = character as u32;

    if (0x20..=0x7E).contains(&code) {
        let index = (code - 0x20) as usize;

        &ASCII_GLYPHS[index]
    } else if (0x2500..=0x257F).contains(&code) {
        let index = (code - 0x2500) as usize;

        &BOX_DRAWING_GLYPHS[index]
    } else {
        &EMPTY_GLYPH
    }
}

/// 8x16 bitmap glyphs for ASCII printable characters (0x20 space through 0x7E tilde).
///
/// Each glyph is 16 bytes — one byte per row, MSB-first (bit 7 = leftmost pixel).
/// Derived from the standard VGA 8x16 bitmap font.
#[rustfmt::skip]
pub(crate) static ASCII_GLYPHS: [[u8; 16]; 95] = [
    // 0x20 ' ' (space)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x21 '!'
    [0x00,0x00,0x18,0x3C,0x3C,0x3C,0x18,0x18,0x18,0x00,0x18,0x18,0x00,0x00,0x00,0x00],
    // 0x22 '"'
    [0x00,0x66,0x66,0x66,0x24,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x23 '#'
    [0x00,0x00,0x00,0x6C,0x6C,0xFE,0x6C,0x6C,0x6C,0xFE,0x6C,0x6C,0x00,0x00,0x00,0x00],
    // 0x24 '$'
    [0x18,0x18,0x7C,0xC6,0xC2,0xC0,0x7C,0x06,0x06,0x86,0xC6,0x7C,0x18,0x18,0x00,0x00],
    // 0x25 '%'
    [0x00,0x00,0x00,0x00,0xC2,0xC6,0x0C,0x18,0x30,0x60,0xC6,0x86,0x00,0x00,0x00,0x00],
    // 0x26 '&'
    [0x00,0x00,0x38,0x6C,0x6C,0x38,0x76,0xDC,0xCC,0xCC,0xCC,0x76,0x00,0x00,0x00,0x00],
    // 0x27 '\''
    [0x00,0x30,0x30,0x30,0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x28 '('
    [0x00,0x00,0x0C,0x18,0x30,0x30,0x30,0x30,0x30,0x30,0x18,0x0C,0x00,0x00,0x00,0x00],
    // 0x29 ')'
    [0x00,0x00,0x30,0x18,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x18,0x30,0x00,0x00,0x00,0x00],
    // 0x2A '*'
    [0x00,0x00,0x00,0x00,0x00,0x66,0x3C,0xFF,0x3C,0x66,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x2B '+'
    [0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x7E,0x18,0x18,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x2C ','
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x18,0x30,0x00,0x00,0x00],
    // 0x2D '-'
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFE,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x2E '.'
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x00],
    // 0x2F '/'
    [0x00,0x00,0x00,0x00,0x02,0x06,0x0C,0x18,0x30,0x60,0xC0,0x80,0x00,0x00,0x00,0x00],
    // 0x30 '0'
    [0x00,0x00,0x7C,0xC6,0xC6,0xCE,0xDE,0xF6,0xE6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x31 '1'
    [0x00,0x00,0x18,0x38,0x78,0x18,0x18,0x18,0x18,0x18,0x18,0x7E,0x00,0x00,0x00,0x00],
    // 0x32 '2'
    [0x00,0x00,0x7C,0xC6,0x06,0x0C,0x18,0x30,0x60,0xC0,0xC6,0xFE,0x00,0x00,0x00,0x00],
    // 0x33 '3'
    [0x00,0x00,0x7C,0xC6,0x06,0x06,0x3C,0x06,0x06,0x06,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x34 '4'
    [0x00,0x00,0x0C,0x1C,0x3C,0x6C,0xCC,0xFE,0x0C,0x0C,0x0C,0x1E,0x00,0x00,0x00,0x00],
    // 0x35 '5'
    [0x00,0x00,0xFE,0xC0,0xC0,0xC0,0xFC,0x06,0x06,0x06,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x36 '6'
    [0x00,0x00,0x38,0x60,0xC0,0xC0,0xFC,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x37 '7'
    [0x00,0x00,0xFE,0xC6,0x06,0x06,0x0C,0x18,0x30,0x30,0x30,0x30,0x00,0x00,0x00,0x00],
    // 0x38 '8'
    [0x00,0x00,0x7C,0xC6,0xC6,0xC6,0x7C,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x39 '9'
    [0x00,0x00,0x7C,0xC6,0xC6,0xC6,0x7E,0x06,0x06,0x06,0x0C,0x78,0x00,0x00,0x00,0x00],
    // 0x3A ':'
    [0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x00,0x00],
    // 0x3B ';'
    [0x00,0x00,0x00,0x00,0x18,0x18,0x00,0x00,0x00,0x18,0x18,0x30,0x00,0x00,0x00,0x00],
    // 0x3C '<'
    [0x00,0x00,0x00,0x06,0x0C,0x18,0x30,0x60,0x30,0x18,0x0C,0x06,0x00,0x00,0x00,0x00],
    // 0x3D '='
    [0x00,0x00,0x00,0x00,0x00,0x7E,0x00,0x00,0x7E,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x3E '>'
    [0x00,0x00,0x00,0x60,0x30,0x18,0x0C,0x06,0x0C,0x18,0x30,0x60,0x00,0x00,0x00,0x00],
    // 0x3F '?'
    [0x00,0x00,0x7C,0xC6,0xC6,0x0C,0x18,0x18,0x18,0x00,0x18,0x18,0x00,0x00,0x00,0x00],
    // 0x40 '@'
    [0x00,0x00,0x7C,0xC6,0xC6,0xDE,0xDE,0xDE,0xDC,0xC0,0xC0,0x7C,0x00,0x00,0x00,0x00],
    // 0x41 'A'
    [0x00,0x00,0x10,0x38,0x6C,0xC6,0xC6,0xFE,0xC6,0xC6,0xC6,0xC6,0x00,0x00,0x00,0x00],
    // 0x42 'B'
    [0x00,0x00,0xFC,0x66,0x66,0x66,0x7C,0x66,0x66,0x66,0x66,0xFC,0x00,0x00,0x00,0x00],
    // 0x43 'C'
    [0x00,0x00,0x3C,0x66,0xC2,0xC0,0xC0,0xC0,0xC0,0xC2,0x66,0x3C,0x00,0x00,0x00,0x00],
    // 0x44 'D'
    [0x00,0x00,0xF8,0x6C,0x66,0x66,0x66,0x66,0x66,0x66,0x6C,0xF8,0x00,0x00,0x00,0x00],
    // 0x45 'E'
    [0x00,0x00,0xFE,0x66,0x62,0x68,0x78,0x68,0x60,0x62,0x66,0xFE,0x00,0x00,0x00,0x00],
    // 0x46 'F'
    [0x00,0x00,0xFE,0x66,0x62,0x68,0x78,0x68,0x60,0x60,0x60,0xF0,0x00,0x00,0x00,0x00],
    // 0x47 'G'
    [0x00,0x00,0x3C,0x66,0xC2,0xC0,0xC0,0xDE,0xC6,0xC6,0x66,0x3A,0x00,0x00,0x00,0x00],
    // 0x48 'H'
    [0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xFE,0xC6,0xC6,0xC6,0xC6,0xC6,0x00,0x00,0x00,0x00],
    // 0x49 'I'
    [0x00,0x00,0x3C,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x3C,0x00,0x00,0x00,0x00],
    // 0x4A 'J'
    [0x00,0x00,0x1E,0x0C,0x0C,0x0C,0x0C,0x0C,0xCC,0xCC,0xCC,0x78,0x00,0x00,0x00,0x00],
    // 0x4B 'K'
    [0x00,0x00,0xE6,0x66,0x66,0x6C,0x78,0x78,0x6C,0x66,0x66,0xE6,0x00,0x00,0x00,0x00],
    // 0x4C 'L'
    [0x00,0x00,0xF0,0x60,0x60,0x60,0x60,0x60,0x60,0x62,0x66,0xFE,0x00,0x00,0x00,0x00],
    // 0x4D 'M'
    [0x00,0x00,0xC6,0xEE,0xFE,0xFE,0xD6,0xC6,0xC6,0xC6,0xC6,0xC6,0x00,0x00,0x00,0x00],
    // 0x4E 'N'
    [0x00,0x00,0xC6,0xE6,0xF6,0xFE,0xDE,0xCE,0xC6,0xC6,0xC6,0xC6,0x00,0x00,0x00,0x00],
    // 0x4F 'O'
    [0x00,0x00,0x7C,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x50 'P'
    [0x00,0x00,0xFC,0x66,0x66,0x66,0x7C,0x60,0x60,0x60,0x60,0xF0,0x00,0x00,0x00,0x00],
    // 0x51 'Q'
    [0x00,0x00,0x7C,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xD6,0xDE,0x7C,0x0C,0x0E,0x00,0x00],
    // 0x52 'R'
    [0x00,0x00,0xFC,0x66,0x66,0x66,0x7C,0x6C,0x66,0x66,0x66,0xE6,0x00,0x00,0x00,0x00],
    // 0x53 'S'
    [0x00,0x00,0x7C,0xC6,0xC6,0x60,0x38,0x0C,0x06,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x54 'T'
    [0x00,0x00,0xFF,0xDB,0x99,0x18,0x18,0x18,0x18,0x18,0x18,0x3C,0x00,0x00,0x00,0x00],
    // 0x55 'U'
    [0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x56 'V'
    [0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0x6C,0x38,0x10,0x00,0x00,0x00,0x00],
    // 0x57 'W'
    [0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xD6,0xD6,0xD6,0xFE,0xEE,0x6C,0x00,0x00,0x00,0x00],
    // 0x58 'X'
    [0x00,0x00,0xC6,0xC6,0x6C,0x7C,0x38,0x38,0x7C,0x6C,0xC6,0xC6,0x00,0x00,0x00,0x00],
    // 0x59 'Y'
    [0x00,0x00,0xC6,0xC6,0xC6,0x6C,0x38,0x18,0x18,0x18,0x18,0x3C,0x00,0x00,0x00,0x00],
    // 0x5A 'Z'
    [0x00,0x00,0xFE,0xC6,0x86,0x0C,0x18,0x30,0x60,0xC2,0xC6,0xFE,0x00,0x00,0x00,0x00],
    // 0x5B '['
    [0x00,0x00,0x3C,0x30,0x30,0x30,0x30,0x30,0x30,0x30,0x30,0x3C,0x00,0x00,0x00,0x00],
    // 0x5C '\\'
    [0x00,0x00,0x00,0x80,0xC0,0xE0,0x70,0x38,0x1C,0x0E,0x06,0x02,0x00,0x00,0x00,0x00],
    // 0x5D ']'
    [0x00,0x00,0x3C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x0C,0x3C,0x00,0x00,0x00,0x00],
    // 0x5E '^'
    [0x10,0x38,0x6C,0xC6,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x5F '_'
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00],
    // 0x60 '`'
    [0x30,0x30,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // 0x61 'a'
    [0x00,0x00,0x00,0x00,0x00,0x78,0x0C,0x7C,0xCC,0xCC,0xCC,0x76,0x00,0x00,0x00,0x00],
    // 0x62 'b'
    [0x00,0x00,0xE0,0x60,0x60,0x78,0x6C,0x66,0x66,0x66,0x66,0x7C,0x00,0x00,0x00,0x00],
    // 0x63 'c'
    [0x00,0x00,0x00,0x00,0x00,0x7C,0xC6,0xC0,0xC0,0xC0,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x64 'd'
    [0x00,0x00,0x1C,0x0C,0x0C,0x3C,0x6C,0xCC,0xCC,0xCC,0xCC,0x76,0x00,0x00,0x00,0x00],
    // 0x65 'e'
    [0x00,0x00,0x00,0x00,0x00,0x7C,0xC6,0xFE,0xC0,0xC0,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x66 'f'
    [0x00,0x00,0x38,0x6C,0x64,0x60,0xF0,0x60,0x60,0x60,0x60,0xF0,0x00,0x00,0x00,0x00],
    // 0x67 'g'
    [0x00,0x00,0x00,0x00,0x00,0x76,0xCC,0xCC,0xCC,0xCC,0xCC,0x7C,0x0C,0xCC,0x78,0x00],
    // 0x68 'h'
    [0x00,0x00,0xE0,0x60,0x60,0x6C,0x76,0x66,0x66,0x66,0x66,0xE6,0x00,0x00,0x00,0x00],
    // 0x69 'i'
    [0x00,0x00,0x18,0x18,0x00,0x38,0x18,0x18,0x18,0x18,0x18,0x3C,0x00,0x00,0x00,0x00],
    // 0x6A 'j'
    [0x00,0x00,0x06,0x06,0x00,0x0E,0x06,0x06,0x06,0x06,0x06,0x06,0x66,0x66,0x3C,0x00],
    // 0x6B 'k'
    [0x00,0x00,0xE0,0x60,0x60,0x66,0x6C,0x78,0x78,0x6C,0x66,0xE6,0x00,0x00,0x00,0x00],
    // 0x6C 'l'
    [0x00,0x00,0x38,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x3C,0x00,0x00,0x00,0x00],
    // 0x6D 'm'
    [0x00,0x00,0x00,0x00,0x00,0xEC,0xFE,0xD6,0xD6,0xD6,0xD6,0xC6,0x00,0x00,0x00,0x00],
    // 0x6E 'n'
    [0x00,0x00,0x00,0x00,0x00,0xDC,0x66,0x66,0x66,0x66,0x66,0x66,0x00,0x00,0x00,0x00],
    // 0x6F 'o'
    [0x00,0x00,0x00,0x00,0x00,0x7C,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x70 'p'
    [0x00,0x00,0x00,0x00,0x00,0xDC,0x66,0x66,0x66,0x66,0x66,0x7C,0x60,0x60,0xF0,0x00],
    // 0x71 'q'
    [0x00,0x00,0x00,0x00,0x00,0x76,0xCC,0xCC,0xCC,0xCC,0xCC,0x7C,0x0C,0x0C,0x1E,0x00],
    // 0x72 'r'
    [0x00,0x00,0x00,0x00,0x00,0xDC,0x76,0x66,0x60,0x60,0x60,0xF0,0x00,0x00,0x00,0x00],
    // 0x73 's'
    [0x00,0x00,0x00,0x00,0x00,0x7C,0xC6,0x60,0x38,0x0C,0xC6,0x7C,0x00,0x00,0x00,0x00],
    // 0x74 't'
    [0x00,0x00,0x10,0x30,0x30,0xFC,0x30,0x30,0x30,0x30,0x36,0x1C,0x00,0x00,0x00,0x00],
    // 0x75 'u'
    [0x00,0x00,0x00,0x00,0x00,0xCC,0xCC,0xCC,0xCC,0xCC,0xCC,0x76,0x00,0x00,0x00,0x00],
    // 0x76 'v'
    [0x00,0x00,0x00,0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xC6,0x6C,0x38,0x00,0x00,0x00,0x00],
    // 0x77 'w'
    [0x00,0x00,0x00,0x00,0x00,0xC6,0xC6,0xD6,0xD6,0xD6,0xFE,0x6C,0x00,0x00,0x00,0x00],
    // 0x78 'x'
    [0x00,0x00,0x00,0x00,0x00,0xC6,0x6C,0x38,0x38,0x38,0x6C,0xC6,0x00,0x00,0x00,0x00],
    // 0x79 'y'
    [0x00,0x00,0x00,0x00,0x00,0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0x7E,0x06,0x0C,0xF8,0x00],
    // 0x7A 'z'
    [0x00,0x00,0x00,0x00,0x00,0xFE,0xCC,0x18,0x30,0x60,0xC6,0xFE,0x00,0x00,0x00,0x00],
    // 0x7B '{'
    [0x00,0x00,0x0E,0x18,0x18,0x18,0x70,0x18,0x18,0x18,0x18,0x0E,0x00,0x00,0x00,0x00],
    // 0x7C '|'
    [0x00,0x00,0x18,0x18,0x18,0x18,0x00,0x18,0x18,0x18,0x18,0x18,0x00,0x00,0x00,0x00],
    // 0x7D '}'
    [0x00,0x00,0x70,0x18,0x18,0x18,0x0E,0x18,0x18,0x18,0x18,0x70,0x00,0x00,0x00,0x00],
    // 0x7E '~'
    [0x00,0x00,0x76,0xDC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
];

/// 8x16 bitmap glyphs for box-drawing characters (U+2500-U+257F).
///
/// Simplified approximations: horizontal lines, vertical lines, and
/// corner/junction pieces rendered as centered strokes.
#[rustfmt::skip]
static BOX_DRAWING_GLYPHS: [[u8; 16]; 128] = [
    // U+2500 ─ BOX DRAWINGS LIGHT HORIZONTAL
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2501 ━ BOX DRAWINGS HEAVY HORIZONTAL
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2502 │ BOX DRAWINGS LIGHT VERTICAL
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+2503 ┃ BOX DRAWINGS HEAVY VERTICAL
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2504-U+250B: dashed lines (approximate as solid)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+250C ┌ BOX DRAWINGS LIGHT DOWN AND RIGHT
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+250D ┍
    [0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+250E ┎
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+250F ┏
    [0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2510 ┐ BOX DRAWINGS LIGHT DOWN AND LEFT
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+2511 ┑
    [0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+2512 ┒
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2513 ┓
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2514 └ BOX DRAWINGS LIGHT UP AND RIGHT
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2515 ┕
    [0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2516 ┖
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2517 ┗
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2518 ┘ BOX DRAWINGS LIGHT UP AND LEFT
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2519 ┙
    [0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+251A ┚
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+251B ┛
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0xFC,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+251C ├ BOX DRAWINGS LIGHT VERTICAL AND RIGHT
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+251D-U+2523: tee variants (approximate)
    [0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3F,0x3F,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2524 ┤ BOX DRAWINGS LIGHT VERTICAL AND LEFT
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+2525-U+252B: tee variants (approximate)
    [0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFC,0xFC,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+252C ┬ BOX DRAWINGS LIGHT DOWN AND HORIZONTAL
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+252D-U+2533: tee variants (approximate)
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2534 ┴ BOX DRAWINGS LIGHT UP AND HORIZONTAL
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2535-U+253B: tee variants (approximate)
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+253C ┼ BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+253D-U+254B: cross variants (approximate as light cross)
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    [0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2549 ╉ HEAVY UP AND LIGHT DOWN AND HORIZONTAL
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+254A ╊ LIGHT UP AND HEAVY DOWN AND HORIZONTAL
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+254B ╋ HEAVY VERTICAL AND HORIZONTAL
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0xFF,0xFF,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+254C-U+254F: dashed (approximate as solid)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+2550 ═ DOUBLE HORIZONTAL
    [0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2551 ║ DOUBLE VERTICAL
    [0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66,0x66],
    // U+2552-U+256C: double-line corners/tees (approximate as solid single)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xFF,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+256D-U+2570: rounded corners (approximate as square corners)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2571-U+2573: diagonal lines (approximate as empty)
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2574-U+2577: half-lines
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
    // U+2578 ╸ HEAVY LEFT
    [0x00,0x00,0x00,0x00,0x00,0x00,0xFC,0xFC,0xFC,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+2579 ╹ HEAVY UP
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+257A ╺ HEAVY RIGHT
    [0x00,0x00,0x00,0x00,0x00,0x00,0x3F,0x3F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+257B ╻ HEAVY DOWN
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+257C ╼ LIGHT LEFT AND HEAVY RIGHT
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+257D ╽ LIGHT UP AND HEAVY DOWN
    [0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C],
    // U+257E ╾ HEAVY LEFT AND LIGHT RIGHT
    [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00],
    // U+257F ╿ HEAVY UP AND LIGHT DOWN
    [0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x3C,0x18,0x18,0x18,0x18,0x18,0x18,0x18,0x18],
];

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn render_to_image_produces_correct_dimensions() {
        // Arrange
        let frame = TerminalFrame::new(80, 24, b"Hello");

        // Act
        let image = render_to_image(&frame);

        // Assert — 80*8 = 640 wide, 24*16 = 384 tall.
        assert_eq!(image.width(), 640);
        assert_eq!(image.height(), 384);
    }

    #[test]
    fn render_to_image_small_terminal() {
        // Arrange
        let frame = TerminalFrame::new(10, 5, b"Hi");

        // Act
        let image = render_to_image(&frame);

        // Assert — 10*8 = 80 wide, 5*16 = 80 tall.
        assert_eq!(image.width(), 80);
        assert_eq!(image.height(), 80);
    }

    #[test]
    fn render_plain_cell_has_correct_background() {
        // Arrange — single cell with default colors.
        let frame = TerminalFrame::new(1, 1, b" ");

        // Act
        let image = render_to_image(&frame);

        // Assert — background should be DEFAULT_BG color.
        let pixel = image.get_pixel(0, 0);
        assert_eq!(pixel.0[0], DEFAULT_BG.red);
        assert_eq!(pixel.0[1], DEFAULT_BG.green);
        assert_eq!(pixel.0[2], DEFAULT_BG.blue);
    }

    #[test]
    fn render_colored_cell_uses_ansi_color() {
        // Arrange — red background via ANSI escape.
        let data = b"\x1b[41m \x1b[0m";
        let frame = TerminalFrame::new(1, 1, data);

        // Act
        let image = render_to_image(&frame);

        // Assert — ANSI red background (index 1 = 128,0,0).
        let pixel = image.get_pixel(0, 0);
        assert_eq!(pixel.0[0], 128);
        assert_eq!(pixel.0[1], 0);
        assert_eq!(pixel.0[2], 0);
    }

    #[test]
    fn render_bold_brightens_foreground() {
        // Arrange — bold 'A' with red foreground.
        let data = b"\x1b[1;31mA\x1b[0m";
        let frame = TerminalFrame::new(1, 1, data);

        // Act — render to ensure no panic, then verify the brightness math.
        let _rendered = render_to_image(&frame);
        let brightened = brighten_component(128);

        // Assert — bold red should be brighter than base red (128).
        assert!(brightened > 128);
    }

    #[test]
    fn render_inverse_swaps_colors() {
        // Arrange — inverse text.
        let data = b"\x1b[7m \x1b[0m";
        let frame = TerminalFrame::new(1, 1, data);

        // Act
        let image = render_to_image(&frame);

        // Assert — background should be default FG color (swapped).
        let pixel = image.get_pixel(0, 0);
        assert_eq!(pixel.0[0], DEFAULT_FG.red);
        assert_eq!(pixel.0[1], DEFAULT_FG.green);
        assert_eq!(pixel.0[2], DEFAULT_FG.blue);
    }

    #[test]
    fn lookup_glyph_returns_known_ascii() {
        // Arrange / Act
        let glyph_a = lookup_glyph('A');
        let glyph_space = lookup_glyph(' ');

        // Assert — 'A' glyph should have non-zero bytes, space should be all zeros.
        assert!(glyph_a.iter().any(|&byte| byte != 0));
        assert!(glyph_space.iter().all(|&byte| byte == 0));
    }

    #[test]
    fn lookup_glyph_returns_empty_for_unsupported() {
        // Arrange / Act
        let glyph = lookup_glyph('\u{1F600}'); // emoji

        // Assert
        assert_eq!(glyph, &EMPTY_GLYPH);
    }

    #[test]
    fn lookup_glyph_returns_box_drawing() {
        // Arrange / Act
        let glyph = lookup_glyph('─'); // U+2500

        // Assert — horizontal line should have non-zero bytes.
        assert!(glyph.iter().any(|&byte| byte != 0));
    }

    #[test]
    fn color_to_rgba_converts_correctly() {
        // Arrange
        let color = CellColor::new(100, 150, 200);

        // Act
        let rgba = color_to_rgba(color);

        // Assert
        assert_eq!(rgba, Rgba([100, 150, 200, 255]));
    }

    #[test]
    fn brighten_component_clamps_at_255() {
        // Arrange / Act
        let result = brighten_component(200);

        // Assert — 200 * 140 / 100 = 280, clamped to 255.
        assert_eq!(result, 255);
    }

    #[test]
    fn dim_component_reduces_brightness() {
        // Arrange / Act
        let result = dim_component(200);

        // Assert — 200 * 60 / 100 = 120.
        assert_eq!(result, 120);
    }

    #[test]
    fn dim_component_handles_zero() {
        // Arrange / Act / Assert
        assert_eq!(dim_component(0), 0);
    }

    #[test]
    fn render_dim_darkens_foreground() {
        // Arrange — dim 'A' with default foreground.
        let data = b"\x1b[2mA\x1b[0m";
        let frame = TerminalFrame::new(1, 1, data);

        // Act
        let _rendered = render_to_image(&frame);
        let dimmed = dim_component(DEFAULT_FG.red);

        // Assert — dim should produce a darker value than default FG.
        assert!(dimmed < DEFAULT_FG.red);
    }
}