Struct jpegxl_sys::JxlExtraChannelInfo

#[repr(C)]pub struct JxlExtraChannelInfo {
    pub type_: JxlExtraChannelType,
    pub bits_per_sample: u32,
    pub exponent_bits_per_sample: u32,
    pub dim_shift: u32,
    pub name_length: u32,
    pub alpha_associated: c_int,
    pub spot_color: [f32; 4],
    pub cfa_channel: u32,
}

Information for a single extra channel.

Fields

type_: JxlExtraChannelType

Given type of an extra channel.

bits_per_sample: u32

Total bits per sample for this channel.

exponent_bits_per_sample: u32

Floating point exponent bits per channel, or 0 if they are unsigned integer.

dim_shift: u32

The exponent the channel is downsampled by on each axis. TODO(lode): expand this comment to match the JPEG XL specification, specify how to upscale, how to round the size computation, and to which extra channels this field applies.

name_length: u32

Length of the extra channel name in bytes, or 0 if no name. Excludes null termination character.

alpha_associated: c_int

Whether alpha channel uses premultiplied alpha. Only applicable if type is JXL_CHANNEL_ALPHA.

spot_color: [f32; 4]

Spot color of the current spot channel in linear RGBA. Only applicable if type is JXL_CHANNEL_SPOT_COLOR.

cfa_channel: u32

Only applicable if type is JXL_CHANNEL_CFA. TODO(lode): add comment about the meaning of this field.

Trait Implementations

impl Clone for JxlExtraChannelInfo

pub fn clone(&self) -> JxlExtraChannelInfo

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for JxlExtraChannelInfo

impl Debug for JxlExtraChannelInfo

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

Formats the value using the given formatter.