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rust: Simplify and optimize pixel iterator

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It should be entirely safe to write u16 to a u32 array: no alignment
issues, no risk of creating undefined values.
This commit is contained in:
Wladimir J. van der Laan 2019-08-28 06:56:49 +00:00
parent d1ee942f10
commit 860bda159a
1 changed files with 3 additions and 7 deletions
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10
rust/embgfx/src/main.rs
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@ -69,14 +69,10 @@ impl Drawing<Rgb565> for Display {
where
T: IntoIterator<Item = Pixel<Rgb565>>,
{
let data = unsafe {core::slice::from_raw_parts_mut(self.data.as_ptr() as *mut u16, DISP_PIXELS)};
for Pixel(coord, color) in item {
let index = coord[0] / 2 + (coord[1] * (DISP_WIDTH as u32) / 2);
let col = u32::from(u16::from(color));
self.data[index as usize] = if (coord[0] % 2) == 0 {
(self.data[index as usize] & 0x0000ffff) | (col << 16)
} else {
(self.data[index as usize] & 0xffff0000) | col
}
let index = (coord[0]^1) + (coord[1] * (DISP_WIDTH as u32));
data[index as usize] = u16::from(color);
}
}
}