26 lines
914 B
Rust
26 lines
914 B
Rust
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use std::io::Cursor;
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use image::{io::Reader, DynamicImage, ImageResult};
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use webp::{Encoder, WebPMemory};
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pub fn thumbnail(bytes: &[u8]) -> ImageResult<(WebPMemory, String)> {
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let original_image = Reader::new(Cursor::new(bytes))
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.with_guessed_format().expect("IO errors impossible with Cursor")
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.decode()?;
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let new_dimm = u32::min(original_image.height(), original_image.width());
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let crop_x = (original_image.width() - new_dimm) / 2;
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let crop_y = (original_image.height() - new_dimm) / 2;
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let cropped = original_image.crop_imm(crop_x, crop_y, new_dimm, new_dimm);
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let scaled = if new_dimm < 400 {
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cropped
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} else {
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original_image.thumbnail_exact(400, 400)
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}.into_rgba8();
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let blurhash = blurhash::encode(4, 4, 400, 400, scaled.as_raw());
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Ok((
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Encoder::from_image(&DynamicImage::ImageRgba8(scaled))
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.expect("Unexpected difficulty interpretting thumbnail")
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.encode(50.0),
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blurhash
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))
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}
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