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use std::collections::HashMap;
use crossfont::Metrics;
use alacritty_terminal::index::{Column, Point};
use alacritty_terminal::term::cell::Flags;
use alacritty_terminal::term::color::Rgb;
use alacritty_terminal::term::{RenderableCell, SizeInfo};
#[derive(Debug, Copy, Clone)]
pub struct RenderRect {
pub x: f32,
pub y: f32,
pub width: f32,
pub height: f32,
pub color: Rgb,
pub alpha: f32,
}
impl RenderRect {
pub fn new(x: f32, y: f32, width: f32, height: f32, color: Rgb, alpha: f32) -> Self {
RenderRect { x, y, width, height, color, alpha }
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct RenderLine {
pub start: Point,
pub end: Point,
pub color: Rgb,
}
impl RenderLine {
pub fn rects(&self, flag: Flags, metrics: &Metrics, size: &SizeInfo) -> Vec<RenderRect> {
let mut rects = Vec::new();
let mut start = self.start;
while start.line < self.end.line {
let end = Point::new(start.line, size.cols() - 1);
Self::push_rects(&mut rects, metrics, size, flag, start, end, self.color);
start = Point::new(start.line + 1, Column(0));
}
Self::push_rects(&mut rects, metrics, size, flag, start, self.end, self.color);
rects
}
/// Push all rects required to draw the cell's line.
fn push_rects(
rects: &mut Vec<RenderRect>,
metrics: &Metrics,
size: &SizeInfo,
flag: Flags,
start: Point,
end: Point,
color: Rgb,
) {
let (position, thickness) = match flag {
Flags::DOUBLE_UNDERLINE => {
// Position underlines so each one has 50% of descent available.
let top_pos = 0.25 * metrics.descent;
let bottom_pos = 0.75 * metrics.descent;
rects.push(Self::create_rect(
size,
metrics.descent,
start,
end,
top_pos,
metrics.underline_thickness,
color,
));
(bottom_pos, metrics.underline_thickness)
},
Flags::UNDERLINE => (metrics.underline_position, metrics.underline_thickness),
Flags::STRIKEOUT => (metrics.strikeout_position, metrics.strikeout_thickness),
_ => unimplemented!("Invalid flag for cell line drawing specified"),
};
rects.push(Self::create_rect(
size,
metrics.descent,
start,
end,
position,
thickness,
color,
));
}
/// Create a line's rect at a position relative to the baseline.
fn create_rect(
size: &SizeInfo,
descent: f32,
start: Point,
end: Point,
position: f32,
mut thickness: f32,
color: Rgb,
) -> RenderRect {
let start_x = start.col.0 as f32 * size.cell_width();
let end_x = (end.col.0 + 1) as f32 * size.cell_width();
let width = end_x - start_x;
// Make sure lines are always visible.
thickness = thickness.max(1.);
let line_bottom = (start.line.0 as f32 + 1.) * size.cell_height();
let baseline = line_bottom + descent;
let mut y = (baseline - position - thickness / 2.).ceil();
let max_y = line_bottom - thickness;
if y > max_y {
y = max_y;
}
RenderRect::new(
start_x + size.padding_x(),
y + size.padding_y(),
width,
thickness,
color,
1.,
)
}
}
/// Lines for underline and strikeout.
#[derive(Default)]
pub struct RenderLines {
inner: HashMap<Flags, Vec<RenderLine>>,
}
impl RenderLines {
#[inline]
pub fn new() -> Self {
Self::default()
}
#[inline]
pub fn rects(&self, metrics: &Metrics, size: &SizeInfo) -> Vec<RenderRect> {
self.inner
.iter()
.flat_map(|(flag, lines)| {
lines.iter().flat_map(move |line| line.rects(*flag, metrics, size))
})
.collect()
}
/// Update the stored lines with the next cell info.
#[inline]
pub fn update(&mut self, cell: RenderableCell) {
self.update_flag(cell, Flags::UNDERLINE);
self.update_flag(cell, Flags::DOUBLE_UNDERLINE);
self.update_flag(cell, Flags::STRIKEOUT);
}
/// Update the lines for a specific flag.
fn update_flag(&mut self, cell: RenderableCell, flag: Flags) {
if !cell.flags.contains(flag) {
return;
}
// Check if there's an active line.
if let Some(line) = self.inner.get_mut(&flag).and_then(|lines| lines.last_mut()) {
if cell.fg == line.color
&& cell.column == line.end.col + 1
&& cell.line == line.end.line
{
// Update the length of the line.
line.end = cell.into();
return;
}
}
// Start new line if there currently is none.
let line = RenderLine { start: cell.into(), end: cell.into(), color: cell.fg };
match self.inner.get_mut(&flag) {
Some(lines) => lines.push(line),
None => {
self.inner.insert(flag, vec![line]);
},
}
}
}
|
