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We now do a better job at rendering dejavusansmono

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The descender in that font seems bad, so guestimate something that works
better for us.
This commit is contained in:
Wez Furlong 2018-02-18 21:59:28 -08:00
parent 8afbcc8ee0
commit e87f129ded
1 changed files with 26 additions and 2 deletions
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28
src/xwin.rs
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@ -392,6 +392,29 @@ impl<'a> TerminalWindow<'a> {
} else { } else {
((descender as f64) / 64.0).floor() as isize ((descender as f64) / 64.0).floor() as isize
}; };
debug!(
"METRICS: h={} w={} d={}",
cell_height,
cell_width,
descender
);
// The descender isn't always reliable. If it looks implausible then we
// cook up something more reasonable. For example, if the descender pulls
// the basline up into the top half of the cell then it is probably bad
// so we halve that distance, putting it closer to the bottom quarter instead.
let descender = if descender.abs() >= cell_height as isize / 2 {
let alt_desc = descender / 2;
eprintln!(
"descender {} is >=50% the cell height, using {} instead",
descender,
alt_desc
);
alt_desc
} else {
descender
};
let host = Host { let host = Host {
window, window,
@ -411,6 +434,7 @@ impl<'a> TerminalWindow<'a> {
underline_data.resize(width * cell_height * 4, 0u8); underline_data.resize(width * cell_height * 4, 0u8);
let descender_row = (cell_height as isize + descender) as usize; let descender_row = (cell_height as isize + descender) as usize;
let descender_plus_one = (1 + descender_row).min(cell_height - 1);
let strike_row = descender_row / 2; let strike_row = descender_row / 2;
// First, the single underline. // First, the single underline.
@ -427,7 +451,7 @@ impl<'a> TerminalWindow<'a> {
{ {
let col = 1; let col = 1;
let offset_one = ((width * 4) * (descender_row - 1)) + (col * 4 * cell_width); let offset_one = ((width * 4) * (descender_row - 1)) + (col * 4 * cell_width);
let offset_two = ((width * 4) * (descender_row + 1)) + (col * 4 * cell_width); let offset_two = ((width * 4) * (descender_plus_one)) + (col * 4 * cell_width);
for i in 0..4 * cell_width { for i in 0..4 * cell_width {
underline_data[offset_one + i] = 0xff; underline_data[offset_one + i] = 0xff;
underline_data[offset_two + i] = 0xff; underline_data[offset_two + i] = 0xff;
@ -456,7 +480,7 @@ impl<'a> TerminalWindow<'a> {
let col = 4; let col = 4;
let offset_one = ((width * 4) * (descender_row - 1)) + (col * 4 * cell_width); let offset_one = ((width * 4) * (descender_row - 1)) + (col * 4 * cell_width);
let offset_two = ((width * 4) * strike_row) + (col * 4 * cell_width); let offset_two = ((width * 4) * strike_row) + (col * 4 * cell_width);
let offset_three = ((width * 4) * (descender_row + 1)) + (col * 4 * cell_width); let offset_three = ((width * 4) * (descender_plus_one)) + (col * 4 * cell_width);
for i in 0..4 * cell_width { for i in 0..4 * cell_width {
underline_data[offset_one + i] = 0xff; underline_data[offset_one + i] = 0xff;
underline_data[offset_two + i] = 0xff; underline_data[offset_two + i] = 0xff;