Struct IFDEntry 

pub struct IFDEntry {
    pub tag: u16,
    pub field_type: u16,
    pub count: u64,
    pub value_offset: u64,
}

Represents an entry in an Image File Directory (IFD)

Each entry describes one aspect of the image (dimensions, color space, compression, etc.) using a tag-value pair. The field_type determines how to interpret the value or offset.

Fields

tag: u16

TIFF tag identifier

field_type: u16

Field type

count: u64

Number of values

value_offset: u64

Value or offset to values

Implementations

impl IFDEntry

pub fn new(tag: u16, field_type: u16, count: u64, value_offset: u64) -> Self

Creates a new IFD entry

This constructs a tag entry with the specified parameters. For small values, value_offset contains the actual value. For larger values, it contains an offset to where the value is stored.

pub fn get_field_type_size(&self) -> usize

Get the size in bytes for this entry’s field type

Different TIFF field types take up different amounts of space. This method returns how many bytes a single value of this entry’s type requires.

pub fn is_value_inline(&self, is_big_tiff: bool) -> bool

Determines if the value is stored inline in value_offset rather than at the offset location

TIFF format allows small values to be stored directly in the IFD entry rather than requiring a separate data area. This method determines if this entry’s value is stored inline or at an external offset.

pub fn description(&self) -> String

Returns a human-readable description of this entry

This is useful for debugging and logging purposes.

Trait Implementations

impl Clone for IFDEntry

fn clone(&self) -> IFDEntry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for IFDEntry

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

Formats the value using the given formatter.