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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.
//! Helpers for creating different cursor glyphs from font metrics
use std::cmp;
use alacritty_terminal::ansi::CursorStyle;
use font::{BitmapBuffer, Metrics, RasterizedGlyph};
pub fn get_cursor_glyph(
cursor: CursorStyle,
metrics: Metrics,
offset_x: i8,
offset_y: i8,
is_wide: bool,
cursor_thickness: f64,
) -> RasterizedGlyph {
// Calculate the cell metrics
let height = metrics.line_height as i32 + i32::from(offset_y);
let mut width = metrics.average_advance as i32 + i32::from(offset_x);
let line_width = cmp::max((cursor_thickness * f64::from(width)).round() as i32, 1);
// Double the cursor width if it's above a double-width glyph
if is_wide {
width *= 2;
}
match cursor {
CursorStyle::HollowBlock => get_box_cursor_glyph(height, width, line_width),
CursorStyle::Underline => get_underline_cursor_glyph(width, line_width),
CursorStyle::Beam => get_beam_cursor_glyph(height, line_width),
CursorStyle::Block => get_block_cursor_glyph(height, width),
CursorStyle::Hidden => RasterizedGlyph::default(),
}
}
// Returns a custom underline cursor character
pub fn get_underline_cursor_glyph(width: i32, line_width: i32) -> RasterizedGlyph {
// Create a new rectangle, the height is relative to the font width
let buf = vec![255u8; (width * line_width * 3) as usize];
// Create a custom glyph with the rectangle data attached to it
RasterizedGlyph {
c: ' ',
top: line_width,
left: 0,
height: line_width,
width,
buf: BitmapBuffer::RGB(buf),
}
}
// Returns a custom beam cursor character
pub fn get_beam_cursor_glyph(height: i32, line_width: i32) -> RasterizedGlyph {
// Create a new rectangle that is at least one pixel wide
let buf = vec![255u8; (line_width * height * 3) as usize];
// Create a custom glyph with the rectangle data attached to it
RasterizedGlyph {
c: ' ',
top: height,
left: 0,
height,
width: line_width,
buf: BitmapBuffer::RGB(buf),
}
}
// Returns a custom box cursor character
pub fn get_box_cursor_glyph(height: i32, width: i32, line_width: i32) -> RasterizedGlyph {
// Create a new box outline rectangle
let mut buf = Vec::with_capacity((width * height * 3) as usize);
for y in 0..height {
for x in 0..width {
if y < line_width
|| y >= height - line_width
|| x < line_width
|| x >= width - line_width
{
buf.append(&mut vec![255u8; 3]);
} else {
buf.append(&mut vec![0u8; 3]);
}
}
}
// Create a custom glyph with the rectangle data attached to it
RasterizedGlyph { c: ' ', top: height, left: 0, height, width, buf: BitmapBuffer::RGB(buf) }
}
// Returns a custom block cursor character
pub fn get_block_cursor_glyph(height: i32, width: i32) -> RasterizedGlyph {
// Create a completely filled glyph
let buf = vec![255u8; (width * height * 3) as usize];
// Create a custom glyph with the rectangle data attached to it
RasterizedGlyph { c: ' ', top: height, left: 0, height, width, buf: BitmapBuffer::RGB(buf) }
}
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