60 lines
1.6 KiB
Rust
60 lines
1.6 KiB
Rust
use alloc::vec::Vec;
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use crate::{drivers::io::framebuffer::colour::Colour, resources::font::Font};
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use super::{
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application::{frame::Frame, render::RenderError},
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maths::geometry::Vec2,
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};
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pub struct Writer<'a> {
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font: &'a Font,
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}
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impl<'a> Writer<'a> {
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pub const fn new(font: &'a Font) -> Self {
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Self { font }
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}
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pub const fn set_font(&mut self, font: &'a Font) {
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self.font = font;
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}
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pub const fn font_size(&self) -> Vec2<usize> {
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Vec2::new(self.font.width(), self.font.height())
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}
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pub fn render_glyph(
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&self,
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frame: &mut Frame,
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pos: Vec2<usize>,
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c: u8,
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scale: usize,
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) -> Result<(), RenderError> {
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// get a reference to the character glyph from the font.
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let data: &[u8] = self.font.glyph_for(c as u16);
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if pos.x() + self.font.width() * scale > frame.dimensions().x()
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|| pos.y() + self.font.height() * scale > frame.dimensions().y()
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{
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return Err(RenderError::Generic);
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}
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for (row, line) in data.iter().enumerate().take(self.font.height()) {
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for col in 0..self.font.width() {
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let pixel_x: usize = pos.x() + col * scale;
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let pixel_y: usize = pos.y() + row * scale;
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if line & (0x80 >> col) != 0 {
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for i in 0..scale {
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for j in 0..scale {
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frame.write_pixel(pixel_x + i, pixel_y + j, Colour::White)?;
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}
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}
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}
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}
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}
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Ok(())
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}
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}
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