Expand description
Image representations for ffi.
Usage
Imagine you want to offer a very simple ffi interface: The caller provides an image buffer and
your program creates a thumbnail from it and dumps that image as png. This module is designed
to help you transition from raw memory data to Rust representation.
use std::ptr;
use std::slice;
use image::Rgb;
use image::flat::{FlatSamples, SampleLayout};
use image::imageops::thumbnail;
#[no_mangle]
pub extern "C" fn store_rgb8_compressed(
data: *const u8, len: usize,
layout: *const SampleLayout
)
-> bool
{
let samples = unsafe { slice::from_raw_parts(data, len) };
let layout = unsafe { ptr::read(layout) };
let buffer = FlatSamples {
samples,
layout,
color_hint: None,
};
let view = match buffer.as_view::<Rgb<u8>>() {
Err(_) => return false, // Invalid layout.
Ok(view) => view,
};
thumbnail(&view, 64, 64)
.save("output.png")
.map(|_| true)
.unwrap_or_else(|_| false)
}Structs
A flat buffer over a (multi channel) image.
A ffi compatible description of a sample buffer.
A flat buffer that can be used as an image view.
A mutable owning version of a flat buffer.
Enums
Denotes invalid flat sample buffers when trying to convert to stricter types.
Different normal forms of buffers.