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August 5, 2025 19:18
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| #![feature(unsized_locals)] | |
| use memmap::MmapOptions; | |
| use neon::prelude::*; | |
| use std::cmp; | |
| use std::f32; | |
| use std::fs::File; | |
| fn parse_image(mut cx: FunctionContext) -> JsResult<JsNull> { | |
| let file_path_arg: Handle<JsString> = cx.argument::<JsString>(0).unwrap(); | |
| let file_path = file_path_arg.value(&mut cx); | |
| let file = File::open(file_path).unwrap(); | |
| let mmap = unsafe { MmapOptions::new().map(&file).unwrap() }; | |
| let dimension = 2048 * 2048; | |
| let redBand = 32; | |
| let greenBand = 16; | |
| let blueBand = 0; | |
| let (_, red, __) = | |
| unsafe { mmap[dimension * redBand * 4..dimension * (redBand + 1) * 4].align_to::<f32>() }; | |
| let (_, green, __) = unsafe { | |
| mmap[dimension * greenBand * 4..dimension * (greenBand + 1) * 4].align_to::<f32>() | |
| }; | |
| let (_, blue, __) = | |
| unsafe { mmap[dimension * blueBand * 4..dimension * (blueBand + 1) * 4].align_to::<f32>() }; | |
| let mut red_result: Vec<u8> = Vec::with_capacity(dimension * 3); | |
| let mut count: usize = 0; | |
| let maxCount = dimension; | |
| loop { | |
| if count == maxCount { | |
| break; | |
| } | |
| let r = (&red[count] * 255.0) as u8; | |
| let g = (&green[count] * 255.0) as u8; | |
| let b = (&blue[count] * 255.0) as u8; | |
| red_result.push(r.to_owned()); | |
| red_result.push(g.to_owned()); | |
| red_result.push(b.to_owned()); | |
| count += 1; | |
| } | |
| image::save_buffer_with_format( | |
| "output.jpeg", | |
| &red_result, | |
| 2048, | |
| 2048, | |
| image::ColorType::Rgb8, | |
| image::ImageFormat::Jpeg, | |
| ) | |
| .unwrap(); | |
| Ok(cx.null()) | |
| } | |
| #[neon::main] | |
| fn main(mut cx: ModuleContext) -> NeonResult<()> { | |
| cx.export_function("parseImage", parse_image)?; | |
| Ok(()) | |
| } |
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