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Add proper strikeout positioning

With this change the strikeout should make proper use of the metrics in
the OS2 table. These metrics are available for all TTF and OTF fonts. If
the metrics are not supplied, a fallback strikeout based on underline
thickness and cell height is used.

To go in line with the metrics supplied by the OS2 table, the term of
`strikethrough` has been replaced with `strikeout` everywhere. I think
it makes sense to go forward with using `strikeout` in general when
talking about this.

There has also been a small bug where the cell would not be
underlined/striked out when an underline is broken over multiple lines.
This has been fixed and the underline/strikeout should always be applied
to each cell with this flag.
This commit is contained in:
Christian Duerr 2018-02-16 22:21:48 +01:00
parent b818d6acdd
commit a0270d9774
No known key found for this signature in database
GPG key ID: 85CDAE3C164BA7B4
8 changed files with 452 additions and 161 deletions

228
Cargo.lock generated
View file

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View file

@ -18,6 +18,7 @@ use std::cmp::min;
use std::path::PathBuf;
use std::fmt;
use freetype::tt_os2::TrueTypeOS2Table;
use freetype::{self, Library};
use libc::c_uint;
@ -103,12 +104,33 @@ impl ::Rasterize for FreeTypeRasterizer {
.round()
.max(1.);
// Get strikeout position and thickness in device pixels
let (strikeout_position, strikeout_thickness) =
match TrueTypeOS2Table::from_face(&mut face.ft_face.clone())
{
Some(os2) => {
let strikeout_position =
(f32::from(os2.y_strikeout_position()) * x_scale / 64.).round();
let strikeout_thickness =
(f32::from(os2.y_strikeout_size()) * x_scale / 64.).round();
(strikeout_position, strikeout_thickness)
},
_ => {
// Fallback if font doesn't provide info about strikeout
trace!("No strikeout data available for font, using fallback.");
let strikeout_position = height as f32 / 2. + descent;
(strikeout_position, underline_thickness)
},
};
Ok(Metrics {
average_advance: full.cell_width,
line_height: height,
descent: descent,
underline_position,
underline_thickness,
strikeout_position,
strikeout_thickness,
})
}

View file

@ -316,6 +316,8 @@ pub struct Metrics {
pub descent: f32,
pub underline_position: f32,
pub underline_thickness: f32,
pub strikeout_position: f32,
pub strikeout_thickness: f32,
}
pub trait Rasterize {

View file

@ -365,10 +365,10 @@ impl Display {
api.clear(background_color);
}
// Store underline/strikethrough information beyond current cell
// Store underline/strikeout information beyond current cell
let mut last_cell = None;
let mut start_underline: Option<RenderableCell> = None;
let mut start_strikethrough: Option<RenderableCell> = None;
let mut start_strikeout: Option<RenderableCell> = None;
// Iterate over all non-empty cells in the grid
for cell in terminal.renderable_cells(config, selection, window_focused) {
@ -384,19 +384,19 @@ impl Display {
cell_line_rects.push(underline);
}
// Check if there is a new strikethrough
if let Some(strikethrough) = calculate_cell_line_state(
// Check if there is a new strikeout
if let Some(strikeout) = calculate_cell_line_state(
cell,
&mut start_strikethrough,
&mut start_strikeout,
&last_cell,
&metrics,
&size_info,
cell::Flags::STRIKE_THROUGH,
cell::Flags::STRIKEOUT,
) {
cell_line_rects.push(strikethrough);
cell_line_rects.push(strikeout);
}
// Change the last checked cell for underline/strikethrough
// Change the last checked cell for underline/strikeout
last_cell = Some(cell);
// Draw the cell
@ -415,14 +415,14 @@ impl Display {
);
}
// If strikethrough hasn't been reset, draw until the last cell
if let Some(start) = start_strikethrough {
// If strikeout hasn't been reset, draw until the last cell
if let Some(start) = start_strikeout {
cell_line_rects.push(
cell_line_rect(
&start,
&last_cell.unwrap(),
&metrics, &size_info,
cell::Flags::STRIKE_THROUGH
cell::Flags::STRIKEOUT
)
);
}
@ -482,8 +482,8 @@ impl Display {
}
}
// Check if the underline/strikethrough state has changed
// This returns a new rectangle whenever an underline/strikethrough ends
// Check if the underline/strikeout state has changed
// This returns a new rectangle whenever an underline/strikeout ends
fn calculate_cell_line_state(
cell: RenderableCell,
start_cell_line: &mut Option<RenderableCell>,
@ -504,8 +504,7 @@ fn calculate_cell_line_state(
}
// Check if we need to start a new line
// because the cell color has changed
*start_cell_line = if cell.fg != start.fg && cell.flags.contains(flag) {
*start_cell_line = if cell.flags.contains(flag) {
// Start a new line
Some(cell)
} else {
@ -525,7 +524,7 @@ fn calculate_cell_line_state(
None
}
// Create a colored rectangle for an underline/strikethrough based on two cells
// Create a colored rectangle for an underline/strikeout based on two cells
fn cell_line_rect(
start: &RenderableCell,
end: &RenderableCell,
@ -537,26 +536,29 @@ fn cell_line_rect(
let end_x = ((end.column.0 + 1) as f64 * metrics.average_advance) as u32;
let width = end_x - x;
let y = match flag {
let (y, height) = match flag {
cell::Flags::UNDERLINE => {
// Get the baseline positon and offset it down by (-) underline position
// then move it up by half the underline thickness
((start.line.0 as f32 + 1.) * metrics.line_height as f32 + metrics.descent
- metrics.underline_position - metrics.underline_thickness / 2.).round() as u32
},
cell::Flags::STRIKE_THROUGH => {
// Get half-way point between cell top and baseline
// Then offset it down by (-) underline position and
// move it up by half the underline thickness
// TODO: Moving the strikethrough down by underline thickness is a hack
((start.line.0 as f32) * metrics.line_height as f32
+ (metrics.line_height as f32 + metrics.descent) / 2.
- metrics.underline_thickness / 2.
- metrics.underline_position).round() as u32
},
let y = ((start.line.0 as f32 + 1.) * metrics.line_height as f32 + metrics.descent
- metrics.underline_position
- metrics.underline_thickness / 2.)
.round() as u32;
let height = metrics.underline_thickness as u32;
(y, height)
}
cell::Flags::STRIKEOUT => {
// Get the baseline positon and offset it up by strikeout position
// then move it up by half the strikeout thickness
let y = ((start.line.0 as f32 + 1.) * metrics.line_height as f32 + metrics.descent
- metrics.strikeout_position
- metrics.strikeout_thickness / 2.)
.round() as u32;
let height = metrics.strikeout_thickness as u32;
(y, height)
}
_ => panic!("Invalid flag for cell line drawing specified"),
};
let height = metrics.underline_thickness as u32;
let rect = Rect::new(x + size.padding_x as u32, y + size.padding_y as u32, width, height);
let color = start.fg;

View file

@ -702,7 +702,7 @@ impl QuadRenderer {
let rect = Rect::new(0, 0, *size.width, *size.height);
self.render_rect(&rect, color, visual_bell_intensity as f32, size);
// Draw underlines and strikethroughs
// Draw underlines and strikeouts
for cell_line_rect in cell_line_rects {
self.render_rect(&cell_line_rect.0, cell_line_rect.1, 255., size);
}

View file

@ -27,7 +27,7 @@ bitflags! {
const WIDE_CHAR_SPACER = 0b0_0100_0000;
const DIM = 0b0_1000_0000;
const DIM_BOLD = 0b0_1000_0010;
const STRIKE_THROUGH = 0b1_0000_0000;
const STRIKEOUT = 0b1_0000_0000;
}
}
@ -104,7 +104,7 @@ impl Cell {
pub fn is_empty(&self) -> bool {
self.c == ' ' &&
self.bg == Color::Named(NamedColor::Background) &&
!self.flags.intersects(Flags::INVERSE | Flags::UNDERLINE | Flags::STRIKE_THROUGH)
!self.flags.intersects(Flags::INVERSE | Flags::UNDERLINE | Flags::STRIKEOUT)
}
#[inline]

View file

@ -1809,8 +1809,8 @@ impl ansi::Handler for Term {
Attr::CancelItalic => self.cursor.template.flags.remove(cell::Flags::ITALIC),
Attr::Underscore => self.cursor.template.flags.insert(cell::Flags::UNDERLINE),
Attr::CancelUnderline => self.cursor.template.flags.remove(cell::Flags::UNDERLINE),
Attr::Strike => self.cursor.template.flags.insert(cell::Flags::STRIKE_THROUGH),
Attr::CancelStrike => self.cursor.template.flags.remove(cell::Flags::STRIKE_THROUGH),
Attr::Strike => self.cursor.template.flags.insert(cell::Flags::STRIKEOUT),
Attr::CancelStrike => self.cursor.template.flags.remove(cell::Flags::STRIKEOUT),
_ => {
debug!("Term got unhandled attr: {:?}", attr);
}