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//! Hikari Text Renderer
const framebuffer = @import("framebuffer.zig");
const font_mod = @import("font.zig");
pub const TextRenderer = struct {
fb: *framebuffer.Framebuffer,
font: *const font_mod.Font,
cursor_x: u32,
cursor_y: u32,
fg_color: framebuffer.Color,
bg_color: framebuffer.Color,
columns: u32,
rows: u32,
pub fn initialize(
fb: *framebuffer.Framebuffer,
font: *const font_mod.Font,
) TextRenderer {
return TextRenderer{
.fb = fb,
.font = font,
.cursor_x = 0,
.cursor_y = 0,
.fg_color = framebuffer.Color.white,
.bg_color = framebuffer.Color.black,
.columns = fb.width / font.width,
.rows = fb.height / font.height,
};
}
pub fn set_colors(self: *TextRenderer, fg: framebuffer.Color, bg: framebuffer.Color) void {
self.fg_color = fg;
self.bg_color = bg;
}
pub fn set_cursor(self: *TextRenderer, col: u32, row: u32) void {
self.cursor_x = col;
self.cursor_y = row;
}
pub fn draw_char(self: *TextRenderer, codepoint: u32) void {
const glyph = self.font.get_glyph(codepoint) orelse self.font.get_glyph('?') orelse return;
const screen_x = self.cursor_x * self.font.width;
const screen_y = self.cursor_y * self.font.height;
var y: u32 = 0;
while (y < self.font.height) : (y += 1) {
var x: u32 = 0;
while (x < self.font.width) : (x += 1) {
const pixel_on = self.font.get_glyph_pixel(glyph, x, y);
const color = if (pixel_on) self.fg_color else self.bg_color;
self.fb.put_pixel(screen_x + x, screen_y + y, color);
}
}
}
pub fn draw_char_at(self: *TextRenderer, codepoint: u32, col: u32, row: u32) void {
const old_x = self.cursor_x;
const old_y = self.cursor_y;
self.cursor_x = col;
self.cursor_y = row;
self.draw_char(codepoint);
self.cursor_x = old_x;
self.cursor_y = old_y;
}
pub fn put_char(self: *TextRenderer, c: u8) void {
switch (c) {
'\n' => {
self.cursor_x = 0;
self.cursor_y += 1;
if (self.cursor_y >= self.rows) {
self.scroll_up();
self.cursor_y = self.rows - 1;
}
},
'\r' => {
self.cursor_x = 0;
},
'\t' => {
const tab_stop = 8;
self.cursor_x = ((self.cursor_x / tab_stop) + 1) * tab_stop;
if (self.cursor_x >= self.columns) {
self.cursor_x = 0;
self.cursor_y += 1;
if (self.cursor_y >= self.rows) {
self.scroll_up();
self.cursor_y = self.rows - 1;
}
}
},
0x08 => {
if (self.cursor_x > 0) {
self.cursor_x -= 1;
}
},
else => {
self.draw_char(c);
self.cursor_x += 1;
if (self.cursor_x >= self.columns) {
self.cursor_x = 0;
self.cursor_y += 1;
if (self.cursor_y >= self.rows) {
self.scroll_up();
self.cursor_y = self.rows - 1;
}
}
},
}
}
pub fn print(self: *TextRenderer, str: []const u8) void {
for (str) |c| {
self.put_char(c);
}
}
pub fn print_line(self: *TextRenderer, str: []const u8) void {
self.print(str);
self.put_char('\n');
}
pub fn scroll_up(self: *TextRenderer) void {
const line_height = self.font.height;
const scroll_pixels = (self.rows - 1) * line_height;
self.fb.copy_rect(0, line_height, 0, 0, self.fb.width, scroll_pixels);
self.fb.fill_rect(
0,
scroll_pixels,
self.fb.width,
line_height,
self.bg_color,
);
}
pub fn clear_screen(self: *TextRenderer) void {
self.fb.clear(self.bg_color);
self.cursor_x = 0;
self.cursor_y = 0;
}
pub fn clear_line(self: *TextRenderer, row: u32) void {
if (row >= self.rows) {
return;
}
self.fb.fill_rect(
0,
row * self.font.height,
self.fb.width,
self.font.height,
self.bg_color,
);
}
pub fn print_u64(self: *TextRenderer, value: u64) void {
var buf: [20]u8 = undefined;
var i: usize = 0;
var v = value;
if (v == 0) {
self.put_char('0');
return;
}
while (v > 0) {
buf[i] = @truncate((v % 10) + '0');
v /= 10;
i += 1;
}
while (i > 0) {
i -= 1;
self.put_char(buf[i]);
}
}
pub fn print_hex(self: *TextRenderer, value: u64) void {
const hex_chars = "0123456789ABCDEF";
self.print("0x");
var started = false;
var shift: u6 = 60;
while (true) {
const nibble: u4 = @truncate((value >> shift) & 0xF);
if (nibble != 0 or started or shift == 0) {
self.put_char(hex_chars[nibble]);
started = true;
}
if (shift == 0) break;
shift -= 4;
}
}
};
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