Enum PixelLayout 

#[non_exhaustive]
pub enum PixelLayout {
    Xrgb8888,
    Rgb565,
}

How pixels are laid out in the mapped framebuffer.

sysfs reports the depth but not the channel order, so this is inferred. The assumptions hold for every mainline framebuffer driver and for DRM’s fbdev emulation, which is what almost every modern /dev/fb0 actually is; a device with an exotic byte order will render with its channels swapped rather than fail, and that is the trade a legacy fallback should make.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Xrgb8888

32 bits per pixel, 0xXXRRGGBB. Matches Denise’s own word layout, so presenting is a copy.

Rgb565

16 bits per pixel, 5 red / 6 green / 5 blue. Common on SPI panels, and needs a conversion on the way out.

Implementations

impl PixelLayout

pub const fn bytes_per_pixel(self) -> usize

Bytes each pixel occupies.

pub const fn from_bits_per_pixel(bpp: u32) -> Option<Self>

Infers the layout from a bit depth.

pub const fn to_rgb565(word: u32) -> u16

Converts one 0xAARRGGBB word to this layout’s 16-bit encoding.

Truncation, not dithering: a UI is flat colour and gradients are rare, so the banding dithering would fix mostly is not there to fix.

Trait Implementations

impl Clone for PixelLayout

fn clone(&self) -> PixelLayout

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for PixelLayout

impl Debug for PixelLayout

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for PixelLayout

impl PartialEq for PixelLayout

fn eq(&self, other: &PixelLayout) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for PixelLayout