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// Copyright 2016 Joe Wilm, The Alacritty Project Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use font::Metrics;
use crate::index::Point;
use crate::term::cell::Flags;
use crate::term::color::Rgb;
use crate::term::{RenderableCell, SizeInfo};
#[derive(Debug, Copy, Clone)]
pub struct Rect<T> {
pub x: T,
pub y: T,
pub width: T,
pub height: T,
}
impl<T> Rect<T> {
pub fn new(x: T, y: T, width: T, height: T) -> Self {
Rect { x, y, width, height }
}
}
#[derive(Debug)]
struct Line {
flag: Flags,
range: Option<(RenderableCell, Point)>,
}
impl Line {
fn new(flag: Flags) -> Self {
Self { flag, range: None }
}
}
/// Rects for underline, strikeout and more.
pub struct Rects<'a> {
inner: Vec<(Rect<f32>, Rgb)>,
active_lines: Vec<Line>,
metrics: &'a Metrics,
size: &'a SizeInfo,
}
impl<'a> Rects<'a> {
pub fn new(metrics: &'a Metrics, size: &'a SizeInfo) -> Self {
let active_lines = vec![Line::new(Flags::UNDERLINE), Line::new(Flags::STRIKEOUT)];
Self { inner: Vec::new(), active_lines, metrics, size }
}
/// Convert the stored rects to rectangles for the renderer.
pub fn rects(&self) -> &Vec<(Rect<f32>, Rgb)> {
&self.inner
}
/// Update the stored lines with the next cell info.
pub fn update_lines(&mut self, size_info: &SizeInfo, cell: &RenderableCell) {
for line in self.active_lines.iter_mut() {
match line.range {
// Check for end if line is present
Some((ref mut start, ref mut end)) => {
// No change in line
if cell.line == start.line
&& cell.flags.contains(line.flag)
&& cell.fg == start.fg
&& cell.column == end.col + 1
{
if size_info.cols() == cell.column && size_info.lines() == cell.line {
// Add the last rect if we've reached the end of the terminal
self.inner.push(create_rect(
&start,
cell.into(),
line.flag,
&self.metrics,
&self.size,
));
} else {
// Update the length of the line
*end = cell.into();
}
continue;
}
self.inner.push(create_rect(start, *end, line.flag, &self.metrics, &self.size));
// Start a new line if the flag is present
if cell.flags.contains(line.flag) {
*start = cell.clone();
*end = cell.into();
} else {
line.range = None;
}
},
// Check for new start of line
None => {
if cell.flags.contains(line.flag) {
line.range = Some((cell.clone(), cell.into()));
}
},
};
}
}
// Add a rectangle
pub fn push(&mut self, rect: Rect<f32>, color: Rgb) {
self.inner.push((rect, color));
}
}
/// Create a rectangle that starts on the left of `start` and ends on the right
/// of `end`, based on the given flag and size metrics.
fn create_rect(
start: &RenderableCell,
end: Point,
flag: Flags,
metrics: &Metrics,
size: &SizeInfo,
) -> (Rect<f32>, Rgb) {
let start_x = start.column.0 as f32 * size.cell_width;
let end_x = (end.col.0 + 1) as f32 * size.cell_width;
let width = end_x - start_x;
let (position, mut height) = match flag {
Flags::UNDERLINE => (metrics.underline_position, metrics.underline_thickness),
Flags::STRIKEOUT => (metrics.strikeout_position, metrics.strikeout_thickness),
_ => unimplemented!("Invalid flag for cell line drawing specified"),
};
// Make sure lines are always visible
height = height.max(1.);
let cell_bottom = (start.line.0 as f32 + 1.) * size.cell_height;
let baseline = cell_bottom + metrics.descent;
let mut y = baseline - position - height / 2.;
let max_y = cell_bottom - height;
if y > max_y {
y = max_y;
}
let rect =
Rect::new(start_x + size.padding_x, y.round() + size.padding_y, width, height.round());
(rect, start.fg)
}
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