32 lines
994 B
Rust
32 lines
994 B
Rust
use std::{mem::transmute, slice};
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use zune_jpeg::{zune_core::{colorspace::ColorSpace, options::DecoderOptions}, JpegDecoder};
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#[no_mangle]
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pub extern "C" fn add(a: u64, b: u64) -> u64 {
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a + b
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}
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#[no_mangle]
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/// decode jpeg image of given length
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///
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/// image format is 0RGB
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pub extern "C" fn decode(image: &mut u32, packet: &u8, length: u32) -> u64 {
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let packet = unsafe {slice::from_raw_parts(packet, length as usize)};
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let image: &mut [u8; 4*320*240] = unsafe{transmute(image)};
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let options = DecoderOptions::new_fast().jpeg_set_out_colorspace(ColorSpace::RGB);
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let Ok(mut frame) = JpegDecoder::new_with_options(packet, options).decode() else {
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return 1; // decoder failure
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};
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// convert from RGB to 0RGB (and swap endianness)
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for (buffer, image) in frame.chunks_exact_mut(3).zip(image.chunks_exact_mut(4)) {
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image[0] = buffer[2];
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image[1] = buffer[1];
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image[2] = buffer[0];
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image[3] = 0;
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}
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0 // success
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}
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