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// font-kit/examples/render-glyph.rs
//
// Copyright © 2018 The Pathfinder Project Developers.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
extern crate clap;
extern crate colored;
extern crate font_kit;
extern crate pathfinder_geometry;
use clap::{Arg, ArgAction, ArgGroup, ArgMatches, Command};
use colored::Colorize;
use font_kit::canvas::{Canvas, Format, RasterizationOptions};
use font_kit::hinting::HintingOptions;
use font_kit::source::SystemSource;
use pathfinder_geometry::transform2d::Transform2F;
use std::fmt::Write;
#[cfg(any(target_family = "windows", target_os = "macos"))]
static SANS_SERIF_FONT_REGULAR_POSTSCRIPT_NAME: &'static str = "ArialMT";
#[cfg(not(any(target_family = "windows", target_os = "macos")))]
static SANS_SERIF_FONT_REGULAR_POSTSCRIPT_NAME: &str = "DejaVuSans";
fn get_args() -> ArgMatches {
let postscript_name_arg = Arg::new("POSTSCRIPT-NAME")
.help("PostScript name of the font")
.default_value(SANS_SERIF_FONT_REGULAR_POSTSCRIPT_NAME)
.index(1);
let glyph_arg = Arg::new("GLYPH")
.help("Character to render")
.default_value("A")
.index(2);
let size_arg = Arg::new("SIZE")
.help("Font size in blocks")
.default_value("32")
.index(3);
let grayscale_arg = Arg::new("grayscale")
.long("grayscale")
.help("Use grayscale antialiasing (default)");
let bilevel_arg = Arg::new("bilevel")
.help("Use bilevel (black & white) rasterization")
.short('b')
.long("bilevel")
.action(ArgAction::SetTrue);
let subpixel_arg = Arg::new("subpixel")
.help("Use subpixel (LCD) rasterization")
.short('s')
.long("subpixel")
.action(ArgAction::SetTrue);
let hinting_value_parser =
clap::builder::PossibleValuesParser::new(["none", "vertical", "full"]);
let hinting_arg = Arg::new("hinting")
.help("Select hinting type")
.short('H')
.long("hinting")
.value_parser(hinting_value_parser)
.value_names(&["TYPE"]);
let transform_arg = Arg::new("transform")
.help("Transform to apply to glyph when rendering")
.long("transform")
.num_args(4);
let rasterization_mode_group =
ArgGroup::new("rasterization-mode").args(&["grayscale", "bilevel", "subpixel"]);
Command::new("render-glyph")
.version("0.1")
.author("The Pathfinder Project Developers")
.about("Simple example tool to render glyphs with `font-kit`")
.arg(postscript_name_arg)
.arg(glyph_arg)
.arg(size_arg)
.arg(grayscale_arg)
.arg(bilevel_arg)
.arg(subpixel_arg)
.group(rasterization_mode_group)
.arg(hinting_arg)
.arg(transform_arg)
.get_matches()
}
fn main() {
let matches = get_args();
let postscript_name = matches
.get_one::<String>("POSTSCRIPT-NAME")
.map(|s| s.as_str())
.unwrap();
let character = matches
.get_one::<String>("GLYPH")
.map(|s| s.as_str())
.unwrap()
.chars()
.next()
.unwrap();
let size: f32 = matches
.get_one::<String>("SIZE")
.map(|s| s.as_str())
.unwrap()
.parse()
.unwrap();
let (canvas_format, rasterization_options) = if matches.get_flag("bilevel") {
(Format::A8, RasterizationOptions::Bilevel)
} else if matches.get_flag("subpixel") {
(Format::Rgb24, RasterizationOptions::SubpixelAa)
} else {
(Format::A8, RasterizationOptions::GrayscaleAa)
};
let mut transform = Transform2F::default();
if let Some(values) = matches.get_many::<String>("transform") {
if let [Ok(a), Ok(b), Ok(c), Ok(d)] = values.map(|x| x.parse()).collect::<Vec<_>>()[..] {
transform = Transform2F::row_major(a, b, c, d, 0.0, 0.0)
}
}
let hinting_options = match matches.get_one::<String>("hinting").map(|s| s.as_str()) {
Some("vertical") => HintingOptions::Vertical(size),
Some("full") => HintingOptions::Full(size),
_ => HintingOptions::None,
};
let font = SystemSource::new()
.select_by_postscript_name(postscript_name)
.unwrap()
.load()
.unwrap();
let glyph_id = font.glyph_for_char(character).unwrap();
let raster_rect = font
.raster_bounds(
glyph_id,
size,
transform,
hinting_options,
rasterization_options,
)
.unwrap();
let mut canvas = Canvas::new(raster_rect.size(), canvas_format);
font.rasterize_glyph(
&mut canvas,
glyph_id,
size,
Transform2F::from_translation(-raster_rect.origin().to_f32()) * transform,
hinting_options,
rasterization_options,
)
.unwrap();
println!("glyph {}:", glyph_id);
for y in 0..raster_rect.height() {
let mut line = String::new();
let (row_start, row_end) = (y as usize * canvas.stride, (y + 1) as usize * canvas.stride);
let row = &canvas.pixels[row_start..row_end];
for x in 0..raster_rect.width() {
match canvas.format {
Format::Rgba32 => unimplemented!(),
Format::Rgb24 => {
write!(
&mut line,
"{}{}{}",
shade(row[x as usize * 3]).to_string().red(),
shade(row[x as usize * 3 + 1]).to_string().green(),
shade(row[x as usize * 3 + 2]).to_string().blue()
)
.unwrap();
}
Format::A8 => {
let shade = shade(row[x as usize]);
line.push(shade);
line.push(shade);
}
}
}
println!("{}", line);
}
}
fn shade(value: u8) -> char {
match value {
0 => ' ',
1..=84 => '░',
85..=169 => '▒',
170..=254 => '▓',
_ => '█',
}
}
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