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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 std::collections::HashMap;
use crate::renderer::Rect;
use crate::term::cell::Flags;
use crate::term::{RenderableCell, SizeInfo};
use crate::Rgb;
use font::Metrics;
/// Lines for underline and strikeout.
pub struct Lines<'a> {
inner: Vec<(Rect<f32>, Rgb)>,
last_starts: HashMap<Flags, Option<RenderableCell>>,
last_cell: Option<RenderableCell>,
metrics: &'a Metrics,
size: &'a SizeInfo,
}
impl<'a> Lines<'a> {
pub fn new(metrics: &'a Metrics, size: &'a SizeInfo) -> Self {
let mut last_starts = HashMap::new();
last_starts.insert(Flags::UNDERLINE, None);
last_starts.insert(Flags::STRIKEOUT, None);
Self {
inner: Vec::new(),
last_cell: None,
last_starts,
metrics,
size,
}
}
/// Convert the stored lines to rectangles for the renderer.
pub fn rects(mut self) -> Vec<(Rect<f32>, Rgb)> {
// If there's still a line pending, draw it until the last cell
for (flag, start_cell) in self.last_starts.iter_mut() {
if let Some(start) = start_cell {
self.inner.push(
create_rect(
&start,
&self.last_cell.unwrap(),
*flag,
&self.metrics,
&self.size,
)
);
}
}
self.inner
}
/// Update the stored lines with the next cell info.
pub fn update_lines(&mut self, cell: &RenderableCell) {
for (flag, start_cell) in self.last_starts.iter_mut() {
let flag = *flag;
*start_cell = match *start_cell {
// Check for end if line is present
Some(ref mut start) => {
let last_cell = self.last_cell.unwrap();
// No change in line
if cell.line == start.line
&& cell.flags.contains(flag)
&& cell.fg == start.fg
&& cell.column == last_cell.column + 1
{
continue;
}
self.inner.push(create_rect(
&start,
&last_cell,
flag,
&self.metrics,
&self.size,
));
// Start a new line if the flag is present
if cell.flags.contains(flag) {
Some(*cell)
} else {
None
}
}
// Check for new start of line
None => if cell.flags.contains(flag) {
Some(*cell)
} else {
None
},
};
}
self.last_cell = Some(*cell);
}
}
/// 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: &RenderableCell,
flag: Flags,
metrics: &Metrics,
size: &SizeInfo,
) -> (Rect<f32>, Rgb) {
let start_x = start.column.0 as f32 * size.cell_width;
let end_x = (end.column.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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