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use ab_glyph::{FontVec, Glyph, InvalidFont, OutlinedGlyph, Point, PxScale, ScaleFont};
use bevy_math::Vec2;
use bevy_render::{
color::Color,
texture::{Texture, TextureFormat},
};
pub struct Font {
pub font: FontVec,
}
unsafe impl Send for Font {}
unsafe impl Sync for Font {}
impl Font {
pub fn try_from_bytes(font_data: Vec<u8>) -> Result<Self, InvalidFont> {
let font = FontVec::try_from_vec(font_data)?;
Ok(Font { font })
}
pub fn get_outlined_glyph_texture(outlined_glyph: OutlinedGlyph) -> Texture {
let bounds = outlined_glyph.px_bounds();
let width = bounds.width() as usize;
let height = bounds.height() as usize;
let mut alpha = vec![0.0; width * height];
outlined_glyph.draw(|x, y, v| {
alpha[y as usize * width + x as usize] = v;
});
let color = Color::WHITE;
let color_u8 = [
(color.r * 255.0) as u8,
(color.g * 255.0) as u8,
(color.b * 255.0) as u8,
];
Texture::new(
Vec2::new(width as f32, height as f32),
alpha
.iter()
.map(|a| {
vec![
color_u8[0],
color_u8[1],
color_u8[2],
(color.a * a * 255.0) as u8,
]
})
.flatten()
.collect::<Vec<u8>>(),
TextureFormat::Rgba8UnormSrgb,
)
}
pub fn render_text(
&self,
text: &str,
color: Color,
font_size: f32,
width: usize,
height: usize,
) -> Texture {
let scale = PxScale::from(font_size);
let scaled_font = ab_glyph::Font::as_scaled(&self.font, scale);
let mut glyphs = Vec::new();
layout_paragraph(
scaled_font,
ab_glyph::point(0.0, 0.0),
width as f32,
text,
&mut glyphs,
);
let color_u8 = [
(color.r * 255.0) as u8,
(color.g * 255.0) as u8,
(color.b * 255.0) as u8,
];
let mut alpha = vec![0.0; width * height];
for glyph in glyphs {
if let Some(outlined) = scaled_font.outline_glyph(glyph) {
let bounds = outlined.px_bounds();
outlined.draw(|x, y, v| {
let offset_x = x as usize + bounds.min.x as usize;
let offset_y = y as usize + bounds.min.y as usize;
if offset_x >= width || offset_y >= height {
return;
}
alpha[offset_y * width + offset_x] = v;
});
}
}
Texture::new(
Vec2::new(width as f32, height as f32),
alpha
.iter()
.map(|a| {
vec![
color_u8[0],
color_u8[1],
color_u8[2],
(color.a * a * 255.0) as u8,
]
})
.flatten()
.collect::<Vec<u8>>(),
TextureFormat::Rgba8UnormSrgb,
)
}
}
fn layout_paragraph<F, SF>(
font: SF,
position: Point,
max_width: f32,
text: &str,
target: &mut Vec<Glyph>,
) where
F: ab_glyph::Font,
SF: ScaleFont<F>,
{
let v_advance = font.height() + font.line_gap();
let mut caret = position + ab_glyph::point(0.0, font.ascent());
let mut last_glyph: Option<Glyph> = None;
for c in text.chars() {
if c.is_control() {
if c == '\n' {
caret = ab_glyph::point(position.x, caret.y + v_advance);
last_glyph = None;
}
continue;
}
let mut glyph = font.scaled_glyph(c);
if let Some(previous) = last_glyph.take() {
caret.x += font.kern(previous.id, glyph.id);
}
glyph.position = caret;
last_glyph = Some(glyph.clone());
caret.x += font.h_advance(glyph.id);
if !c.is_whitespace() && caret.x > position.x + max_width {
caret = ab_glyph::point(position.x, caret.y + v_advance);
glyph.position = caret;
last_glyph = None;
}
target.push(glyph);
}
}