bevy/crates/bevy_text/src/glyph_brush.rs
KDecay 7a7f097485 Move Size to bevy_ui (#4285)
# Objective

- Related #4276.
- Part of the splitting process of #3503.

## Solution

- Move `Size` to `bevy_ui`.

## Reasons

- `Size` is only needed in `bevy_ui` (because it needs to use `Val` instead of `f32`), but it's also used as a worse `Vec2`  replacement in other areas.
- `Vec2` is more powerful than `Size` so it should be used whenever possible.
- Discussion in #3503.

## Changelog

### Changed

- The `Size` type got moved from `bevy_math` to `bevy_ui`.

## Migration Guide

- The `Size` type got moved from `bevy::math` to `bevy::ui`. To migrate you just have to import `bevy::ui::Size` instead of `bevy::math::Math` or use the `bevy::prelude` instead.

Co-authored-by: KDecay <KDecayMusic@protonmail.com>
2022-04-25 13:54:46 +00:00

181 lines
5.7 KiB
Rust

use ab_glyph::{Font as _, FontArc, Glyph, ScaleFont as _};
use bevy_asset::{Assets, Handle};
use bevy_math::Vec2;
use bevy_render::texture::Image;
use bevy_sprite::TextureAtlas;
use glyph_brush_layout::{
FontId, GlyphPositioner, Layout, SectionGeometry, SectionGlyph, SectionText, ToSectionText,
};
use crate::{error::TextError, Font, FontAtlasSet, GlyphAtlasInfo, TextAlignment};
pub struct GlyphBrush {
fonts: Vec<FontArc>,
handles: Vec<Handle<Font>>,
latest_font_id: FontId,
}
impl Default for GlyphBrush {
fn default() -> Self {
GlyphBrush {
fonts: Vec::new(),
handles: Vec::new(),
latest_font_id: FontId(0),
}
}
}
impl GlyphBrush {
pub fn compute_glyphs<S: ToSectionText>(
&self,
sections: &[S],
bounds: Vec2,
text_alignment: TextAlignment,
) -> Result<Vec<SectionGlyph>, TextError> {
let geom = SectionGeometry {
bounds: (bounds.x, bounds.y),
..Default::default()
};
let section_glyphs = Layout::default()
.h_align(text_alignment.horizontal.into())
.v_align(text_alignment.vertical.into())
.calculate_glyphs(&self.fonts, &geom, sections);
Ok(section_glyphs)
}
pub fn process_glyphs(
&self,
glyphs: Vec<SectionGlyph>,
sections: &[SectionText],
font_atlas_set_storage: &mut Assets<FontAtlasSet>,
fonts: &Assets<Font>,
texture_atlases: &mut Assets<TextureAtlas>,
textures: &mut Assets<Image>,
) -> Result<Vec<PositionedGlyph>, TextError> {
if glyphs.is_empty() {
return Ok(Vec::new());
}
let sections_data = sections
.iter()
.map(|section| {
let handle = &self.handles[section.font_id.0];
let font = fonts.get(handle).ok_or(TextError::NoSuchFont)?;
let font_size = section.scale.y;
Ok((
handle,
font,
font_size,
ab_glyph::Font::as_scaled(&font.font, font_size),
))
})
.collect::<Result<Vec<_>, _>>()?;
let mut max_y = std::f32::MIN;
let mut min_x = std::f32::MAX;
for sg in &glyphs {
let glyph = &sg.glyph;
let scaled_font = sections_data[sg.section_index].3;
max_y = max_y.max(glyph.position.y - scaled_font.descent());
min_x = min_x.min(glyph.position.x);
}
max_y = max_y.floor();
min_x = min_x.floor();
let mut positioned_glyphs = Vec::new();
for sg in glyphs {
let SectionGlyph {
section_index: _,
byte_index,
mut glyph,
font_id: _,
} = sg;
let glyph_id = glyph.id;
let glyph_position = glyph.position;
let adjust = GlyphPlacementAdjuster::new(&mut glyph);
let section_data = sections_data[sg.section_index];
if let Some(outlined_glyph) = section_data.1.font.outline_glyph(glyph) {
let bounds = outlined_glyph.px_bounds();
let handle_font_atlas: Handle<FontAtlasSet> = section_data.0.as_weak();
let font_atlas_set = font_atlas_set_storage
.get_or_insert_with(handle_font_atlas, FontAtlasSet::default);
let atlas_info = font_atlas_set
.get_glyph_atlas_info(section_data.2, glyph_id, glyph_position)
.map(Ok)
.unwrap_or_else(|| {
font_atlas_set.add_glyph_to_atlas(texture_atlases, textures, outlined_glyph)
})?;
let texture_atlas = texture_atlases.get(&atlas_info.texture_atlas).unwrap();
let glyph_rect = texture_atlas.textures[atlas_info.glyph_index as usize];
let size = Vec2::new(glyph_rect.width(), glyph_rect.height());
let x = bounds.min.x + size.x / 2.0 - min_x;
let y = max_y - bounds.max.y + size.y / 2.0;
let position = adjust.position(Vec2::new(x, y));
positioned_glyphs.push(PositionedGlyph {
position,
size,
atlas_info,
section_index: sg.section_index,
byte_index,
});
}
}
Ok(positioned_glyphs)
}
pub fn add_font(&mut self, handle: Handle<Font>, font: FontArc) -> FontId {
self.fonts.push(font);
self.handles.push(handle);
let font_id = self.latest_font_id;
self.latest_font_id = FontId(font_id.0 + 1);
font_id
}
}
#[derive(Debug, Clone)]
pub struct PositionedGlyph {
pub position: Vec2,
pub size: Vec2,
pub atlas_info: GlyphAtlasInfo,
pub section_index: usize,
pub byte_index: usize,
}
#[cfg(feature = "subpixel_glyph_atlas")]
struct GlyphPlacementAdjuster;
#[cfg(feature = "subpixel_glyph_atlas")]
impl GlyphPlacementAdjuster {
#[inline(always)]
pub fn new(_: &mut Glyph) -> Self {
Self
}
#[inline(always)]
pub fn position(&self, p: Vec2) -> Vec2 {
p
}
}
#[cfg(not(feature = "subpixel_glyph_atlas"))]
struct GlyphPlacementAdjuster(f32);
#[cfg(not(feature = "subpixel_glyph_atlas"))]
impl GlyphPlacementAdjuster {
#[inline(always)]
pub fn new(glyph: &mut Glyph) -> Self {
let v = glyph.position.x.round();
glyph.position.x = 0.;
glyph.position.y = glyph.position.y.ceil();
Self(v)
}
#[inline(always)]
pub fn position(&self, v: Vec2) -> Vec2 {
Vec2::new(self.0, 0.) + v
}
}