Struct RandomAccessDecoder 

pub struct RandomAccessDecoder<D: ScanlineDecoder> { /* private fields */ }

Random-access scanline decoder wrapper.

Wraps any ScanlineDecoder and adds get_scanline(line) support with caching and rewind logic. Ported from upstream PDFium’s ScanlineDecoder::GetScanline(int line).

Implementations

impl<D: ScanlineDecoder> RandomAccessDecoder<D>

pub fn new(inner: D) -> Self

Wrap a scanline decoder with random access capability.

pub fn skip_to_scanline(&mut self, target: usize)

Skip to scanline target by warming the cache via scanline().

Overrides the sequential decode-and-discard loop from ScanlineDecoder with the random-access cache path. Mirrors PDFium’s ScanlineDecoder::SkipToScanline().

This is a Tier-1 primary: the body calls another rpdfium function (scanline()) and discards its Result return value, so it is not a pure Tier-2 delegation and must not carry #[inline].

pub fn scanline(&mut self, line: usize) -> Result<Option<&[u8]>, DecodeError>

Get a specific scanline by line index (0-based).

If the requested line is the one just decoded, returns a cached copy. If the requested line is before the current position, rewinds and re-reads sequentially. Matches upstream PDFium’s caching pattern.

Primary name; get_scanline is the upstream-style alias. Mirrors PDFium’s ScanlineDecoder::GetScanline().

pub fn get_scanline( &mut self, line: usize, ) -> Result<Option<&[u8]>, DecodeError>

Upstream alias for scanline(). Mirrors PDFium’s GetScanline().

pub fn inner(&self) -> &D

Get a reference to the underlying decoder.

pub fn width(&self) -> u32

Image width in pixels.

pub fn get_width(&self) -> u32

Upstream alias for width(). Mirrors PDFium’s GetWidth().

pub fn height(&self) -> u32

Image height in pixels.

pub fn get_height(&self) -> u32

Upstream alias for height(). Mirrors PDFium’s GetHeight().

pub fn comps_count(&self) -> u8

Number of color components per pixel. Mirrors PDFium’s CountComps().

pub fn count_comps(&self) -> u8

Upstream alias for comps_count(). Mirrors PDFium’s CountComps().

pub fn bpc(&self) -> u8

Bits per color component.

pub fn get_bpc(&self) -> u8

Upstream alias for bpc(). Mirrors PDFium’s GetBPC().

pub fn row_stride(&self) -> usize

Number of bytes per row.