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This commit optimizes the function used to converg rgba pixels into bgra pixels.

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This commit is contained in:
Zak 2021-05-11 22:41:55 +01:00
parent 08f5591148
commit 77a17cde83
1 changed files with 5 additions and 17 deletions
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22
wgpu/src/image/vector.rs
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@ -1,7 +1,8 @@
use crate::image::atlas::{self, Atlas};
use iced_native::svg; use iced_native::svg;
use std::collections::{HashMap, HashSet}; use std::collections::{HashMap, HashSet};
use crate::image::atlas::{self, Atlas};
pub enum Svg { pub enum Svg {
Loaded(usvg::Tree), Loaded(usvg::Tree),
NotFound, NotFound,
@ -111,26 +112,13 @@ impl Cache {
let width = img.width(); let width = img.width();
let height = img.height(); let height = img.height();
let mut rgba = img.take().into_iter(); let mut rgba = img.take();
rgba.chunks_exact_mut(4).for_each(|rgba| rgba.swap(0, 2));
// TODO: Perform conversion in the GPU
let bgra: Vec<u8> = std::iter::from_fn(move || {
use std::iter::once;
let r = rgba.next()?;
let g = rgba.next()?;
let b = rgba.next()?;
let a = rgba.next()?;
Some(once(b).chain(once(g)).chain(once(r)).chain(once(a)))
})
.flatten()
.collect();
let allocation = texture_atlas.upload( let allocation = texture_atlas.upload(
width, width,
height, height,
bytemuck::cast_slice(bgra.as_slice()), bytemuck::cast_slice(rgba.as_slice()),
device, device,
encoder, encoder,
)?; )?;