Struct exr::meta::MetaData

pub struct MetaData {
    pub requirements: Requirements,
    pub headers: Headers,
}

Contains the complete meta data of an exr image. Defines how the image is split up in the file, the number and type of images and channels, and various other attributes. The usage of custom attributes is encouraged.

Fields

requirements: Requirements

Some flags summarizing the features that must be supported to decode the file.

headers: Headers

One header to describe each layer in this file.

Implementations

impl MetaData

pub fn read_from_file(path: impl AsRef<Path>, pedantic: bool) -> Result<Self>

Read the exr meta data from a file. Use read_from_unbuffered instead if you do not have a file. Does not validate the meta data.

pub fn read_from_unbuffered( unbuffered: impl Read, pedantic: bool, ) -> Result<Self>

Buffer the reader and then read the exr meta data from it. Use read_from_buffered if your reader is an in-memory reader. Use read_from_file if you have a file path. Does not validate the meta data.

pub fn read_from_buffered(buffered: impl Read, pedantic: bool) -> Result<Self>

Read the exr meta data from a reader. Use read_from_file if you have a file path. Use read_from_unbuffered if this is not an in-memory reader. Does not validate the meta data.

pub(crate) fn read_unvalidated_from_buffered_peekable( read: &mut PeekRead<impl Read>, pedantic: bool, ) -> Result<Self>

Does not validate the meta data completely.

pub(crate) fn read_validated_from_buffered_peekable( read: &mut PeekRead<impl Read>, pedantic: bool, ) -> Result<Self>

Validates the meta data.

pub(crate) fn write_validating_to_buffered( write: &mut impl Write, headers: &[Header], pedantic: bool, ) -> Result<Requirements>

Validates the meta data and writes it to the stream. If pedantic, throws errors for files that may produce errors in other exr readers. Returns the automatically detected minimum requirement flags.

pub fn read_offset_tables( read: &mut PeekRead<impl Read>, headers: &Headers, ) -> Result<OffsetTables>

Read one offset table from the reader for each header.

pub fn skip_offset_tables( read: &mut PeekRead<impl Read>, headers: &Headers, ) -> Result<usize>

Skip the offset tables by advancing the reader by the required byte count.

pub fn enumerate_ordered_header_block_indices( &self, ) -> impl '_ + Iterator<Item = (usize, BlockIndex)>

This iterator tells you the block indices of all blocks that must be in the image. The order of the blocks depends on the LineOrder attribute (unspecified line order is treated the same as increasing line order). The blocks written to the file must be exactly in this order, except for when the LineOrder is unspecified. The index represents the block index, in increasing line order, within the header.

pub fn collect_ordered_blocks<'s>( &'s self, get_block: impl 's + FnMut(BlockIndex) -> UncompressedBlock, ) -> impl 's + Iterator<Item = (usize, UncompressedBlock)>

Go through all the block indices in the correct order and call the specified closure for each of these blocks. That way, the blocks indices are filled with real block data and returned as an iterator. The closure returns the an UncompressedBlock for each block index.

pub fn collect_ordered_block_data<'s>( &'s self, get_block_data: impl 's + FnMut(BlockIndex) -> Vec<u8>, ) -> impl 's + Iterator<Item = (usize, UncompressedBlock)>

Go through all the block indices in the correct order and call the specified closure for each of these blocks. That way, the blocks indices are filled with real block data and returned as an iterator. The closure returns the byte data for each block index.

pub fn validate(headers: &[Header], pedantic: bool) -> Result<Requirements>

Validates this meta data. Returns the minimal possible requirements.

Trait Implementations

impl Clone for MetaData

fn clone(&self) -> MetaData

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MetaData

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

Formats the value using the given formatter.

impl PartialEq for MetaData

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

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

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

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for MetaData