Struct Composite 

pub struct Composite { /* private fields */ }

An open merged image. Reading it doesn’t hold the file in memory.

Implementations

impl Composite

pub fn open(path: &Path) -> Result<Self, PsdError>

Reads the structure of the file at path, checking every length against the file’s size; pixels are read when asked for, so a huge header on a small file is refused here.

pub fn size(&self) -> (u32, u32)

The picture’s size in pixels, upright.

pub fn read_rects( &mut self, rects: &[[u32; 4]], ) -> Result<Vec<RgbaImage>, PsdError>

The rectangles [x0, y0, x1, y1] of the upright picture at full resolution as straight-alpha RGBA. Every row of the file is decoded once however many rectangles it crosses; memory is the rectangles’ pixels at 4 bytes each, plus what the module notes describe.

pub fn read_scaled( &mut self, rect: [u32; 4], long: u32, ) -> Result<RgbaImage, PsdError>

The rectangle [x0, y0, x1, y1] of the upright picture, box-filtered down so its long side is at most long pixels; never enlarged. The memory beyond the module notes’ is 40 bytes per pixel of one row of the result, and 4 per pixel of the result. Reduced six times or more, rows are skipped so a huge file stays quick, leaving at least three rows averaged into each row of the result.