bevy/crates/bevy_text/src/font_atlas.rs

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use ab_glyph::GlyphId;
use bevy_asset::{Assets, Handle};
2020-07-17 00:23:50 +00:00
use bevy_math::Vec2;
use bevy_render::texture::{Extent3d, Texture, TextureDimension, TextureFormat};
use bevy_sprite::{DynamicTextureAtlasBuilder, TextureAtlas};
use bevy_utils::HashMap;
pub struct FontAtlas {
pub dynamic_texture_atlas_builder: DynamicTextureAtlasBuilder,
pub glyph_to_atlas_index: HashMap<GlyphId, u32>,
pub texture_atlas: Handle<TextureAtlas>,
}
impl FontAtlas {
pub fn new(
textures: &mut Assets<Texture>,
texture_atlases: &mut Assets<TextureAtlas>,
size: Vec2,
) -> FontAtlas {
let atlas_texture = textures.add(Texture::new_fill(
Extent3d::new(size.x as u32, size.y as u32, 1),
TextureDimension::D2,
&[0, 0, 0, 0],
TextureFormat::Rgba8UnormSrgb,
));
let texture_atlas = TextureAtlas::new_empty(atlas_texture, size);
Self {
texture_atlas: texture_atlases.add(texture_atlas),
glyph_to_atlas_index: HashMap::default(),
dynamic_texture_atlas_builder: DynamicTextureAtlasBuilder::new(size, 1),
}
}
pub fn get_glyph_index(&self, glyph_id: GlyphId) -> Option<u32> {
self.glyph_to_atlas_index.get(&glyph_id).copied()
}
pub fn has_glyph(&self, glyph_id: GlyphId) -> bool {
self.glyph_to_atlas_index.contains_key(&glyph_id)
}
pub fn add_glyph(
&mut self,
textures: &mut Assets<Texture>,
texture_atlases: &mut Assets<TextureAtlas>,
glyph_id: GlyphId,
texture: &Texture,
) -> bool {
let texture_atlas = texture_atlases.get_mut(&self.texture_atlas).unwrap();
if let Some(index) =
self.dynamic_texture_atlas_builder
.add_texture(texture_atlas, textures, texture)
{
self.glyph_to_atlas_index.insert(glyph_id, index);
true
} else {
false
}
}
}