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Improved performance of thumbnail generation

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This commit is contained in:
Antoine Gersant 2017-10-08 15:25:46 -07:00
parent a3f7223722
commit f4977f523d
1 changed files with 15 additions and 17 deletions
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32
src/thumbnails.rs
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@ -1,11 +1,11 @@
use image;
use image::GenericImage;
use image::ImageBuffer;
use image::ImageFormat;
use image::FilterType;
use image::imageops::resize;
use std::cmp;
use std::collections::hash_map::DefaultHasher;
use std::fs::DirBuilder;
use std::fs::{DirBuilder, File};
use std::hash::{Hash, Hasher};
use std::path::*;
@ -42,22 +42,20 @@ pub fn get_thumbnail(real_path: &Path, max_dimension: u32) -> Result<PathBuf> {
if !out_path.exists() {
let source_aspect_ratio: f32 = source_width as f32 / source_height as f32;
if source_aspect_ratio < 0.8 || source_aspect_ratio > 1.2 {
let mut cropped_image = ImageBuffer::new(cropped_dimension, cropped_dimension);
cropped_image.copy_from(&source_image,
(cropped_dimension - source_width) / 2,
(cropped_dimension - source_height) / 2);
let out_image = resize(&cropped_image,
out_dimension,
out_dimension,
FilterType::Lanczos3);
out_image.save(out_path.as_path())?;
let scaled_image =
source_image.resize(out_dimension, out_dimension, FilterType::Lanczos3);
let (scaled_width, scaled_height) = scaled_image.dimensions();
let mut final_image = ImageBuffer::new(out_dimension, out_dimension);
final_image.copy_from(&scaled_image,
(out_dimension - scaled_width) / 2,
(out_dimension - scaled_height) / 2);
final_image.save(&out_path)?;
} else {
let out_image = resize(&source_image,
out_dimension,
out_dimension,
FilterType::Lanczos3);
out_image.save(out_path.as_path())?;
}
let mut out_file = File::create(&out_path)?;
let final_image =
source_image.resize_exact(max_dimension, out_dimension, FilterType::Lanczos3);
final_image.save(&mut out_file, ImageFormat::PNG)?;
};
}
Ok(out_path)