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|
//! Terminal - Console output with cursor and scrolling
const ascii = @import("../../common/constants/ascii.zig");
const boot = @import("../../boot/multiboot/multiboot.zig");
const colors = @import("../../common/constants/colors.zig");
const font = @import("../fonts/psf.zig");
const pixel = @import("../../utils/graphics/pixel.zig");
const terminal_limits = @import("../../common/limits/terminal.zig");
const video = @import("../video/video.zig");
const LineType = enum { Hard, Soft };
var fb: ?boot.FramebufferInfo = null;
var cursor_x: u32 = 0;
var cursor_y: u32 = 0;
var char_width: u32 = terminal_limits.DEFAULT_CHAR_WIDTH;
var char_height: u32 = terminal_limits.DEFAULT_CHAR_HEIGHT;
var max_line_width: u32 = 0;
var line_types: [terminal_limits.MAX_LINES]LineType = [_]LineType{.Hard} ** terminal_limits.MAX_LINES;
var current_line: usize = 0;
pub fn init(framebuffer: boot.FramebufferInfo) void {
fb = framebuffer;
cursor_x = 0;
cursor_y = 0;
current_line = 0;
char_width = font.get_width();
char_height = font.get_height();
max_line_width = pixel.line_width(framebuffer);
video.init(framebuffer);
video.clear(colors.BLACK);
reset_line_types();
}
fn reset_line_types() void {
for (&line_types) |*lt| {
lt.* = .Hard;
}
}
pub fn put_char(char: u8) void {
put_char_color(char, colors.WHITE);
}
pub fn put_char_color(char: u8, color: u32) void {
const f = fb orelse return;
switch (char) {
ascii.NEWLINE => handle_newline(f),
ascii.BACKSPACE => handle_backspace(f),
ascii.TAB => handle_tab(f),
else => handle_printable(f, char, color),
}
}
fn handle_newline(f: boot.FramebufferInfo) void {
cursor_x = 0;
cursor_y += char_height;
mark_line(.Hard);
check_scroll(f);
}
fn handle_backspace(f: boot.FramebufferInfo) void {
if (cursor_x >= char_width) {
cursor_x -= char_width;
clear_char_at_cursor(f);
} else if (cursor_x == 0 and cursor_y > 0) {
const line_num = cursor_y / char_height;
if (line_num > 0 and line_num < terminal_limits.MAX_LINES) {
if (line_types[line_num] == .Soft) {
cursor_y -= char_height;
current_line = cursor_y / char_height;
cursor_x = ((max_line_width - char_width) / char_width) * char_width;
clear_char_at_cursor(f);
}
}
}
}
fn handle_tab(f: boot.FramebufferInfo) void {
cursor_x += char_width * terminal_limits.TAB_WIDTH;
if (cursor_x >= max_line_width) {
cursor_x = 0;
cursor_y += char_height;
mark_line(.Soft);
check_scroll(f);
}
}
fn handle_printable(f: boot.FramebufferInfo, char: u8, color: u32) void {
if (char < ascii.PRINTABLE_START or char > ascii.PRINTABLE_END) return;
if (cursor_x + char_width > max_line_width) {
cursor_x = 0;
cursor_y += char_height;
mark_line(.Soft);
check_scroll(f);
}
font.render_char(char, cursor_x, cursor_y, f, color);
cursor_x += char_width;
}
fn mark_line(line_type: LineType) void {
const new_line = cursor_y / char_height;
if (new_line != current_line and new_line < terminal_limits.MAX_LINES) {
line_types[new_line] = line_type;
}
current_line = new_line;
}
fn check_scroll(f: boot.FramebufferInfo) void {
if (cursor_y + char_height >= f.height) {
scroll(f);
}
}
fn clear_char_at_cursor(f: boot.FramebufferInfo) void {
pixel.fill_rect(f, cursor_x, cursor_y, char_width, char_height, colors.BLACK);
}
fn scroll(f: boot.FramebufferInfo) void {
var dst_y: u32 = 0;
var src_y: u32 = char_height;
while (src_y < f.height) : ({
src_y += 1;
dst_y += 1;
}) {
pixel.copy_row(f, dst_y, src_y);
}
while (dst_y < f.height) : (dst_y += 1) {
pixel.clear_row(f, dst_y, colors.BLACK);
}
cursor_y -= char_height;
var i: usize = 1;
while (i < terminal_limits.MAX_LINES) : (i += 1) {
line_types[i - 1] = line_types[i];
}
line_types[terminal_limits.MAX_LINES - 1] = .Hard;
if (current_line > 0) current_line -= 1;
}
pub fn print(text: []const u8) void {
for (text) |char| {
put_char(char);
}
}
pub fn print_color(text: []const u8, color: u32) void {
for (text) |char| {
put_char_color(char, color);
}
}
pub fn clear_screen() void {
const f = fb orelse return;
pixel.fill(f, colors.BLACK);
cursor_x = 0;
cursor_y = 0;
current_line = 0;
reset_line_types();
}
pub fn get_cursor_x() u32 {
return cursor_x;
}
pub fn get_cursor_y() u32 {
return cursor_y;
}
pub fn set_cursor(x: u32, y: u32) void {
cursor_x = x;
cursor_y = y;
}
|
