339 lines
9.5 KiB
Rust
339 lines
9.5 KiB
Rust
use crate::buffer::BufferView;
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use crate::{color::Color, fonts::FontRef};
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use rusttype::{point, Scale};
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use std::collections::HashMap;
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struct CachedGlyph {
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dimensions: (u32, u32),
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origin: (i32, i32),
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render: Vec<f32>,
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advance: i32,
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}
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impl CachedGlyph {
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fn new(font: FontRef, size: f32, ch: char) -> CachedGlyph {
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let scale = Scale::uniform(size);
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let v_metrics = font.v_metrics(scale);
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let glyph = font.glyph(ch).scaled(scale);
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let advance = glyph.h_metrics().advance_width as i32;
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let glyph = glyph.positioned(point(0.0, v_metrics.ascent));
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if let Some(bounding_box) = glyph.pixel_bounding_box() {
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let origin = (bounding_box.min.x, bounding_box.min.y);
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let dimensions = (
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(bounding_box.max.x - bounding_box.min.x) as u32,
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(bounding_box.max.y - bounding_box.min.y) as u32,
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);
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let mut render = vec![0.0; (dimensions.0 * dimensions.1) as usize];
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glyph.draw(|x, y, o| {
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let pos = x + (y * dimensions.0);
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render[pos as usize] = o;
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});
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CachedGlyph {
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origin,
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dimensions,
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render,
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advance,
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}
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} else {
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CachedGlyph {
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origin: (0, 0),
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dimensions: (0, 0),
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render: Vec::new(),
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advance: (size / 4.0) as i32,
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}
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}
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}
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fn draw(&self, buf: &mut BufferView, pos: (i32, i32), c: Color) {
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let mut x = 0;
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let mut y = 0;
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let bounds = buf.get_bounds();
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let offset = (bounds.0 as i32, bounds.1 as i32);
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for v in &self.render {
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buf.put_raw(
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(
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(x + pos.0 + self.origin.0 + offset.0) as u32,
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(y + pos.1 + self.origin.1 + offset.1) as u32,
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),
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c.alpha(*v),
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);
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if x == self.dimensions.0 as i32 - 1 {
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y += 1;
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x = 0;
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} else {
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x += 1;
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}
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}
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}
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}
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pub struct Font<'a> {
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glyphs: HashMap<char, CachedGlyph>,
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font: FontRef<'a>,
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size: f32,
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}
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impl<'a> Font<'a> {
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pub fn new(font: FontRef<'a>, size: f32) -> Font {
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Font {
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glyphs: HashMap::new(),
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font,
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size,
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}
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}
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pub fn height(&self) -> f32 {
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let scale = Scale::uniform(self.size);
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let m = self.font.v_metrics(scale);
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m.ascent - m.descent
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}
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pub fn add_str_to_cache(&mut self, s: &str) {
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for ch in s.chars() {
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if self.glyphs.get(&ch).is_none() {
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let glyph = CachedGlyph::new(self.font, self.size, ch);
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self.glyphs.insert(ch, glyph);
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}
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}
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}
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pub fn draw_text(
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&self,
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buf: &mut BufferView,
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c: Color,
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s: &str,
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) -> Result<(u32, u32), ::std::io::Error> {
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let mut x_off = 0;
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let mut off = 0;
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let mut glyphs = Vec::with_capacity(s.len());
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for ch in s.chars() {
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let glyph = match self.glyphs.get(&ch) {
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Some(glyph) => glyph,
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None => {
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return Err(::std::io::Error::new(
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::std::io::ErrorKind::Other,
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format!("glyph for {:} not in cache", ch),
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))
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}
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};
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glyphs.push(glyph);
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if glyph.origin.1 < off {
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off = glyph.origin.1
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}
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}
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for glyph in glyphs {
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glyph.draw(buf, (x_off, -off), c);
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x_off += glyph.advance;
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}
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Ok((x_off as u32, self.size as u32))
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}
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pub fn draw_text_with_cursor(
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&self,
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buf: &mut BufferView,
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c: Color,
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s: &str,
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cursor: usize,
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) -> Result<(u32, u32), ::std::io::Error> {
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let mut x_off: i32 = 0;
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let mut off: i32 = 0;
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let mut glyphs = Vec::with_capacity(s.len());
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for ch in s.chars() {
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let glyph = match self.glyphs.get(&ch) {
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Some(glyph) => glyph,
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None => {
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return Err(::std::io::Error::new(
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::std::io::ErrorKind::Other,
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format!("glyph for {:} not in cache", ch),
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))
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}
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};
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glyphs.push(glyph);
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if glyph.origin.1 < off {
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off = glyph.origin.1
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}
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}
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let height = buf.get_bounds().3;
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for (i, glyph) in glyphs.iter().enumerate() {
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if i == cursor {
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self.draw_cursor(buf, c, x_off as u32, height)?;
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}
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glyph.draw(buf, (x_off, -off), c);
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x_off += glyph.advance;
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}
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if cursor == glyphs.len() {
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self.draw_cursor(buf, c, x_off as u32, height)?;
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}
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Ok((x_off as u32, self.size as u32))
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}
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pub fn draw_cursor(
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&self,
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buf: &mut BufferView,
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c: Color,
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offset: u32,
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height: u32,
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) -> Result<(), ::std::io::Error> {
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// draw cursor
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let bounds = buf.get_bounds();
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for i in bounds.1 + 1..height + bounds.1 {
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buf.put_raw((bounds.0 + offset, i), c);
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}
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Ok(())
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}
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pub fn auto_widest(&mut self, s: &str) -> Result<u32, ::std::io::Error> {
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self.add_str_to_cache(s);
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let mut max = 0;
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for ch in s.chars() {
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let glyph = match self.glyphs.get(&ch) {
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Some(glyph) => glyph,
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None => {
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return Err(::std::io::Error::new(
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::std::io::ErrorKind::Other,
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format!("glyph for {:} not in cache", ch),
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))
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}
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};
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let width = glyph.advance;
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if width > max {
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max = width
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}
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}
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Ok(max as u32)
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}
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pub fn auto_draw_text(
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&mut self,
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buf: &mut BufferView,
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c: Color,
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s: &str,
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) -> Result<(u32, u32), ::std::io::Error> {
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self.add_str_to_cache(s);
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self.draw_text(buf, c, s)
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}
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pub fn auto_draw_text_with_cursor(
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&mut self,
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buf: &mut BufferView,
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c: Color,
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s: &str,
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cursor: usize,
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) -> Result<(u32, u32), ::std::io::Error> {
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self.add_str_to_cache(s);
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self.draw_text_with_cursor(buf, c, s, cursor)
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}
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pub fn draw_text_fixed_width(
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&self,
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buf: &mut BufferView,
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c: Color,
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distances: &[u32],
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s: &str,
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) -> Result<(u32, u32), ::std::io::Error> {
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let mut x_off = 0;
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let mut off = 0;
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let mut glyphs = Vec::with_capacity(s.len());
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for ch in s.chars() {
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let glyph = match self.glyphs.get(&ch) {
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Some(glyph) => glyph,
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None => {
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return Err(::std::io::Error::new(
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::std::io::ErrorKind::Other,
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format!("glyph for {:} not in cache", ch),
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))
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}
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};
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glyphs.push(glyph);
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if glyph.origin.1 < off {
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off = glyph.origin.1
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}
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}
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for (idx, glyph) in glyphs.into_iter().enumerate() {
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glyph.draw(buf, (x_off, -off), c);
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x_off += distances[idx] as i32;
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}
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Ok((x_off as u32, self.size as u32))
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}
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pub fn draw_text_individual_colors(
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&self,
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buf: &mut BufferView,
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color: &[Color],
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s: &str,
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) -> Result<(u32, u32), ::std::io::Error> {
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let mut x_off = 0;
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let mut off = 0;
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let mut glyphs = Vec::with_capacity(s.len());
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for ch in s.chars() {
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let glyph = match self.glyphs.get(&ch) {
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Some(glyph) => glyph,
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None => {
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return Err(::std::io::Error::new(
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::std::io::ErrorKind::Other,
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format!("glyph for {:} not in cache", ch),
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))
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}
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};
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glyphs.push(glyph);
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if glyph.origin.1 < off {
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off = glyph.origin.1
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}
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}
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for (idx, glyph) in glyphs.into_iter().enumerate() {
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glyph.draw(buf, (x_off, -off), color[idx]);
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x_off += glyph.advance;
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}
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Ok((x_off as u32, self.size as u32))
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}
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pub fn auto_draw_text_individual_colors(
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&mut self,
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buf: &mut BufferView,
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color: &[Color],
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s: &str,
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) -> Result<(u32, u32), ::std::io::Error> {
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self.add_str_to_cache(s);
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self.draw_text_individual_colors(buf, color, s)
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}
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}
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pub fn draw_box(buf: &mut BufferView, c: Color, dim: (u32, u32)) -> Result<(), ::std::io::Error> {
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let bounds = buf.get_bounds();
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buf.put_line_raw((bounds.0, bounds.1), dim.0, c);
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buf.put_line_raw((bounds.0, bounds.1 + dim.1 - 1), dim.0, c);
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for y in bounds.1..dim.1 + bounds.1 {
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buf.put_raw((bounds.0, y), c);
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buf.put_raw((bounds.0 + dim.0 - 1, y), c);
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}
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Ok(())
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}
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pub fn draw_bar(
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buf: &mut BufferView,
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color: Color,
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length: u32,
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height: u32,
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fill: f32,
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) -> Result<(), ::std::io::Error> {
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let mut fill_pos = ((length as f32) * fill) as u32;
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if fill_pos > length {
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fill_pos = length;
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}
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let bounds = buf.get_bounds();
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for y in bounds.1..height + bounds.1 {
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buf.put_line_raw((bounds.0, y), fill_pos, color);
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}
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Ok(())
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}
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