Struct lofty::PictureInformation

pub struct PictureInformation {
    pub width: u32,
    pub height: u32,
    pub color_depth: u32,
    pub num_colors: u32,
}

Information about a Picture

This information is necessary for FLAC’s METADATA_BLOCK_PICTURE. See Picture::as_flac_bytes for more information.

Fields

width: u32

The picture’s width in pixels

height: u32

The picture’s height in pixels

color_depth: u32

The picture’s color depth in bits per pixel

num_colors: u32

The number of colors used

Implementations

impl PictureInformation

pub fn from_picture(picture: &Picture) -> Result<Self>

Attempt to extract PictureInformation from a Picture

NOTE: Since FLAC only supports PNG and JPEG, this function is no different.

Errors

• picture.data is less than 8 bytes in length
• picture.data contains a format that isn’t PNG or JPEG
• See PictureInformation::from_png and PictureInformation::from_jpeg

pub fn from_png(data: &[u8]) -> Result<Self>

Attempt to extract PictureInformation from a PNG

Errors

• reader does not start with a PNG signature
• reader is not a valid PNG

pub fn from_jpeg(data: &[u8]) -> Result<Self>

Attempt to extract PictureInformation from a JPEG

Errors

• reader is not a JPEG image
• reader does not contain a SOFn frame

Trait Implementations

impl Clone for PictureInformation

fn clone(&self) -> PictureInformation

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for PictureInformation

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

Formats the value using the given formatter.

impl Default for PictureInformation

fn default() -> PictureInformation

Returns the “default value” for a type.

impl Hash for PictureInformation

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl PartialEq<PictureInformation> for PictureInformation

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

This method tests for self and other values to be equal, and is used by ==.

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

This method tests for !=.

impl Copy for PictureInformation

impl Eq for PictureInformation

impl StructuralEq for PictureInformation

impl StructuralPartialEq for PictureInformation