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|
/// GOP framebuffer driver — renders text via a bitmap font.
///
/// Text surface (cursor, scrolling, colours) lives in `crate::vt`; this
/// module is the low-level rasteriser: glyph blits and pixel shifts on the
/// linear framebuffer.
use crate::font;
use crate::uefi::{GraphicsOutputProtocol, PIXEL_BGR, PIXEL_RGB};
use core::fmt;
use core::ptr;
/// Framebuffer state captured before ExitBootServices.
pub struct Framebuffer {
base: *mut u8,
#[allow(dead_code)]
width: usize,
height: usize,
pitch: usize, // bytes per scan line
bytes_per_pixel: usize,
bg: u32, // packed BGRA or RGBA background colour
bgr: bool,
}
static mut FB: Option<Framebuffer> = None;
/// Initialise the framebuffer from GOP. Call *before* ExitBootServices.
pub fn init(gop: &mut GraphicsOutputProtocol) {
let mode = unsafe { &*gop.mode };
let info = unsafe { &*mode.info };
let base = mode.framebuffer_base as *mut u8;
let width = info.horizontal_resolution as usize;
let height = info.vertical_resolution as usize;
let pitch = info.pixels_per_scan_line as usize * 4; // 32-bit pixel
let bpp = 4;
// Pick colours based on pixel format
let (fg, bg) = match info.pixel_format {
PIXEL_BGR => (0x00_FF_FF_FFu32, 0x00_00_00_00u32), // white fg, black bg
PIXEL_RGB => (0x00_FF_FF_FFu32, 0x00_00_00_00u32),
_ => (0x00_FF_FF_FFu32, 0x00_00_00_00u32),
};
let bgr = info.pixel_format == PIXEL_BGR;
let _ = fg;
let fb = Framebuffer {
base,
width,
height,
pitch,
bytes_per_pixel: bpp,
bg,
bgr,
};
fb.clear();
unsafe {
FB = Some(fb);
}
}
// ---------------------------------------------------------------------------
// Public text API — the text surface now lives in `crate::vt`; these wrappers
// keep callers (shell, macros) unchanged.
// ---------------------------------------------------------------------------
/// Draw a character at the current terminal cursor position and advance.
pub fn put_char(c: char) {
let b = if (c as u32) < 0x100 { c as u8 } else { b'?' };
crate::vt::put_char(b);
}
/// Write a string to the terminal.
pub fn write_str(s: &str) {
crate::vt::write_str(s);
}
/// Clear the terminal and home the cursor.
pub fn clear_screen() {
crate::vt::clear_all();
}
/// (cols, rows) of the text surface, from the current framebuffer mode.
pub fn dims() -> (usize, usize) {
unsafe {
match FB.as_ref() {
Some(f) => (f.width / 8, f.height / 16),
None => (0, 0),
}
}
}
/// Pack an (r, g, b) colour for the framebuffer's pixel format.
pub fn rgb(r: u8, g: u8, b: u8) -> u32 {
unsafe {
match FB.as_ref() {
Some(f) if f.bgr => ((r as u32) << 16) | ((g as u32) << 8) | b as u32,
_ => ((b as u32) << 16) | ((g as u32) << 8) | r as u32,
}
}
}
// ---------------------------------------------------------------------------
// Framebuffer implementation
// ---------------------------------------------------------------------------
impl Framebuffer {
fn clear(&self) {
let size = self.pitch * self.height;
// Fill with background colour (32-bit writes)
let mut p = self.base;
let end = unsafe { p.add(size) };
unsafe {
while p < end {
ptr::write_volatile(p as *mut u32, self.bg);
p = p.add(4);
}
}
}
/// Shift the whole framebuffer up one row (16 pixels) and clear the
/// exposed bottom row. Called by `vt::scroll_up`; the vt then re-blits
/// only the new bottom row.
pub(crate) fn shift_up(&self) {
// Move everything up one row (16 pixels)
let row_bytes = self.pitch * 16;
let total = self.pitch * self.height;
unsafe {
ptr::copy(self.base.add(row_bytes), self.base, total - row_bytes);
// Clear last row
let last_row = self.base.add(total - row_bytes);
for i in 0..(self.pitch * 16 / 4) {
ptr::write_volatile(last_row.add(i * 4) as *mut u32, self.bg);
}
}
}
}
/// Blit one glyph cell at (col, row) with explicit fg/bg colours.
pub(crate) fn blit_glyph(col: usize, row: usize, ch: u16, fg: (u8, u8, u8), bg: (u8, u8, u8)) {
if let Some(fb) = unsafe { FB.as_ref() } {
let glyph_idx = if ch < 256 { ch as usize } else { 32 };
let glyph = font::GLYPH_8X16;
let data = match glyph.get(glyph_idx) {
Some(d) => *d,
None => return,
};
let fg = rgb(fg.0, fg.1, fg.2);
let bg = rgb(bg.0, bg.1, bg.2);
let x = col * 8;
let y = row * 16;
for cy in 0..16 {
let row_bits = data[cy];
for cx in 0..8 {
let offset = (y + cy) * fb.pitch + (x + cx) * fb.bytes_per_pixel;
unsafe {
let px = if row_bits & (0x80 >> cx) != 0 { fg } else { bg };
ptr::write_volatile(fb.base.add(offset) as *mut u32, px);
}
}
}
}
}
/// Shift the framebuffer up one row and clear the bottom row.
pub(crate) fn shift_up() {
if let Some(fb) = unsafe { FB.as_ref() } {
fb.shift_up();
}
}
// ---------------------------------------------------------------------------
// fmt::Write wrapper
// ---------------------------------------------------------------------------
pub struct GopWriter;
impl fmt::Write for GopWriter {
fn write_str(&mut self, s: &str) -> fmt::Result {
write_str(s);
Ok(())
}
}
/// Write a formatted string to the framebuffer.
#[macro_export]
macro_rules! gop_print {
($($arg:tt)*) => {{
use core::fmt::Write;
let _ = write!(&mut $crate::gop::GopWriter, $($arg)*);
}};
}
#[macro_export]
macro_rules! gop_println {
() => { $crate::gop::write_str("\n"); };
($($arg:tt)*) => {{
$crate::gop_print!($($arg)*);
$crate::gop::write_str("\n");
}};
}
|
