383 lines
13 KiB
Rust
383 lines
13 KiB
Rust
#[macro_use]
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extern crate lazy_static;
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extern crate regex;
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extern crate image;
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extern crate rayon;
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extern crate utils;
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extern crate errors;
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use std::path::{Path, PathBuf};
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use std::hash::{Hash, Hasher};
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use std::collections::HashMap;
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use std::collections::hash_map::Entry as HEntry;
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use std::collections::hash_map::DefaultHasher;
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use std::fs::{self, File};
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use regex::Regex;
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use image::{GenericImage, FilterType};
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use image::jpeg::JPEGEncoder;
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use rayon::prelude::*;
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use utils::fs as ufs;
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use errors::{Result, ResultExt};
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static RESIZED_SUBDIR: &'static str = "_processed_images";
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lazy_static! {
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pub static ref RESIZED_FILENAME: Regex = Regex::new(r#"([0-9a-f]{16})([0-9a-f]{2})[.]jpg"#).unwrap();
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}
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/// Describes the precise kind of a resize operation
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#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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pub enum ResizeOp {
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/// A simple scale operation that doesn't take aspect ratio into account
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Scale(u32, u32),
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/// Scales the image to a specified width with height computed such
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/// that aspect ratio is preserved
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FitWidth(u32),
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/// Scales the image to a specified height with width computed such
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/// that aspect ratio is preserved
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FitHeight(u32),
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/// Scales the image such that it fits within the specified width and
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/// height preserving aspect ratio.
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/// Either dimension may end up being smaller, but never larger than specified.
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Fit(u32, u32),
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/// Scales the image such that it fills the specified width and height.
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/// Output will always have the exact dimensions specified.
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/// The part of the image that doesn't fit in the thumbnail due to differing
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/// aspect ratio will be cropped away, if any.
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Fill(u32, u32),
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}
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impl ResizeOp {
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pub fn from_args(op: &str, width: Option<u32>, height: Option<u32>) -> Result<ResizeOp> {
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use ResizeOp::*;
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// Validate args:
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match op {
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"fit_width" => if width.is_none() {
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return Err("op=\"fit_width\" requires a `width` argument".to_string().into());
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},
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"fit_height" => if height.is_none() {
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return Err("op=\"fit_height\" requires a `height` argument".to_string().into());
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},
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"scale" | "fit" | "fill" => if width.is_none() || height.is_none() {
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return Err(format!("op={} requires a `width` and `height` argument", op).into());
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},
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_ => return Err(format!("Invalid image resize operation: {}", op).into())
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};
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Ok(match op {
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"scale" => Scale(width.unwrap(), height.unwrap()),
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"fit_width" => FitWidth(width.unwrap()),
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"fit_height" => FitHeight(height.unwrap()),
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"fit" => Fit(width.unwrap(), height.unwrap()),
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"fill" => Fill(width.unwrap(), height.unwrap()),
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_ => unreachable!(),
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})
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}
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pub fn width(self) -> Option<u32> {
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use ResizeOp::*;
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match self {
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Scale(w, _) => Some(w),
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FitWidth(w) => Some(w),
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FitHeight(_) => None,
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Fit(w, _) => Some(w),
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Fill(w, _) => Some(w),
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}
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}
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pub fn height(self) -> Option<u32> {
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use ResizeOp::*;
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match self {
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Scale(_, h) => Some(h),
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FitWidth(_) => None,
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FitHeight(h) => Some(h),
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Fit(_, h) => Some(h),
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Fill(_, h) => Some(h),
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}
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}
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}
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impl From<ResizeOp> for u8 {
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fn from(op: ResizeOp) -> u8 {
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use ResizeOp::*;
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match op {
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Scale(_, _) => 1,
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FitWidth(_) => 2,
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FitHeight(_) => 3,
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Fit(_, _) => 4,
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Fill(_, _) => 5,
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}
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}
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}
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impl Hash for ResizeOp {
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fn hash<H: Hasher>(&self, hasher: &mut H) {
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hasher.write_u8(u8::from(*self));
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if let Some(w) = self.width() { hasher.write_u32(w); }
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if let Some(h) = self.height() { hasher.write_u32(h); }
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}
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}
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/// Holds all data needed to perform a resize operation
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#[derive(Debug, PartialEq, Eq)]
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pub struct ImageOp {
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source: String,
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op: ResizeOp,
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quality: u8,
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/// Hash of the above parameters
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hash: u64,
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/// If there is a hash collision with another ImageOp, this contains a sequential ID > 1
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/// identifying the collision in the order as encountered (which is essentially random).
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/// Therefore, ImageOps with collisions (ie. collision_id > 0) are always considered out of date.
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/// Note that this is very unlikely to happen in practice
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collision_id: u32,
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}
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impl ImageOp {
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pub fn new(source: String, op: ResizeOp, quality: u8) -> ImageOp {
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let mut hasher = DefaultHasher::new();
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hasher.write(source.as_ref());
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op.hash(&mut hasher);
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hasher.write_u8(quality);
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let hash = hasher.finish();
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ImageOp { source, op, quality, hash, collision_id: 0 }
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}
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pub fn from_args(
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source: String,
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op: &str,
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width: Option<u32>,
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height: Option<u32>,
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quality: u8,
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) -> Result<ImageOp> {
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let op = ResizeOp::from_args(op, width, height)?;
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Ok(Self::new(source, op, quality))
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}
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fn perform(&self, content_path: &Path, target_path: &Path) -> Result<()> {
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use ResizeOp::*;
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let src_path = content_path.join(&self.source);
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if !ufs::file_stale(&src_path, target_path) {
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return Ok(());
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}
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let mut img = image::open(&src_path)?;
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let (img_w, img_h) = img.dimensions();
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const RESIZE_FILTER: FilterType = FilterType::Gaussian;
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const RATIO_EPSILLION: f32 = 0.1;
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let img = match self.op {
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Scale(w, h) => img.resize_exact(w, h, RESIZE_FILTER),
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FitWidth(w) => img.resize(w, u32::max_value(), RESIZE_FILTER),
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FitHeight(h) => img.resize(u32::max_value(), h, RESIZE_FILTER),
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Fit(w, h) => img.resize(w, h, RESIZE_FILTER),
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Fill(w, h) => {
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let factor_w = img_w as f32 / w as f32;
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let factor_h = img_h as f32 / h as f32;
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if (factor_w - factor_h).abs() <= RATIO_EPSILLION {
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// If the horizontal and vertical factor is very similar,
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// that means the aspect is similar enough that there's not much point
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// in cropping, so just perform a simple scale in this case.
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img.resize_exact(w, h, RESIZE_FILTER)
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} else {
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// We perform the fill such that a crop is performed first
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// and then resize_exact can be used, which should be cheaper than
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// resizing and then cropping (smaller number of pixels to resize).
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let (crop_w, crop_h) = if factor_w < factor_h {
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(img_w, (factor_w * h as f32).round() as u32)
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} else {
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((factor_h * w as f32).round() as u32, img_h)
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};
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let (offset_w, offset_h) = if factor_w < factor_h {
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(0, (img_h - crop_h) / 2)
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} else {
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((img_w - crop_w) / 2, 0)
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};
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img.crop(offset_w, offset_h, crop_w, crop_h)
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.resize_exact(w, h, RESIZE_FILTER)
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}
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}
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};
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let mut f = File::create(target_path)?;
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let mut enc = JPEGEncoder::new_with_quality(&mut f, self.quality);
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let (img_w, img_h) = img.dimensions();
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enc.encode(&img.raw_pixels(), img_w, img_h, img.color())?;
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Ok(())
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}
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}
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/// A strcture into which image operations can be enqueued and then performed.
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/// All output is written in a subdirectory in `static_path`,
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/// taking care of file stale status based on timestamps and possible hash collisions.
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#[derive(Debug)]
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pub struct Processor {
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content_path: PathBuf,
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resized_path: PathBuf,
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resized_url: String,
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/// A map of a ImageOps by their stored hash.
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/// Note that this cannot be a HashSet, because hashset handles collisions and we don't want that,
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/// we need to be aware of and handle collisions ourselves.
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img_ops: HashMap<u64, ImageOp>,
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/// Hash collisions go here:
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img_ops_collisions: Vec<ImageOp>,
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}
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impl Processor {
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pub fn new(content_path: PathBuf, static_path: &Path, base_url: &str) -> Processor {
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Processor {
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content_path,
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resized_path: static_path.join(RESIZED_SUBDIR),
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resized_url: Self::resized_url(base_url),
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img_ops: HashMap::new(),
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img_ops_collisions: Vec::new(),
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}
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}
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fn resized_url(base_url: &str) -> String {
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if base_url.ends_with('/') {
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format!("{}{}", base_url, RESIZED_SUBDIR)
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} else {
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format!("{}/{}", base_url, RESIZED_SUBDIR)
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}
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}
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pub fn set_base_url(&mut self, base_url: &str) {
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self.resized_url = Self::resized_url(base_url);
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}
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pub fn source_exists(&self, source: &str) -> bool {
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self.content_path.join(source).exists()
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}
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pub fn num_img_ops(&self) -> usize {
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self.img_ops.len() + self.img_ops_collisions.len()
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}
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fn insert_with_collisions(&mut self, mut img_op: ImageOp) -> u32 {
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match self.img_ops.entry(img_op.hash) {
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HEntry::Occupied(entry) => if *entry.get() == img_op { return 0; },
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HEntry::Vacant(entry) => {
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entry.insert(img_op);
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return 0;
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}
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}
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// If we get here, that means a hash collision.
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// This is detected when there is an ImageOp with the same hash in the `img_ops`
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// map but which is not equal to this one.
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// To deal with this, all collisions get a (random) sequential ID number.
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// First try to look up this ImageOp in `img_ops_collisions`, maybe we've
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// already seen the same ImageOp.
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// At the same time, count IDs to figure out the next free one.
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// Start with the ID of 2, because we'll need to use 1 for the ImageOp
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// already present in the map:
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let mut collision_id = 2;
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for op in self.img_ops_collisions.iter().filter(|op| op.hash == img_op.hash) {
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if *op == img_op {
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// This is a colliding ImageOp, but we've already seen an equal one
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// (not just by hash, but by content too), so just return its ID:
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return collision_id;
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} else {
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collision_id += 1;
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}
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}
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// If we get here, that means this is a new colliding ImageOp and
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// `collision_id` is the next free ID
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if collision_id == 2 {
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// This is the first collision found with this hash, update the ID
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// of the matching ImageOp in the map.
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self.img_ops.get_mut(&img_op.hash).unwrap().collision_id = 1;
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}
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img_op.collision_id = collision_id;
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self.img_ops_collisions.push(img_op);
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collision_id
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}
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fn op_filename(hash: u64, collision_id: u32) -> String {
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// Please keep this in sync with RESIZED_FILENAME
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assert!(collision_id < 256, "Unexpectedly large number of collisions: {}", collision_id);
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format!("{:016x}{:02x}.jpg", hash, collision_id)
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}
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fn op_url(&self, hash: u64, collision_id: u32) -> String {
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format!("{}/{}", &self.resized_url, Self::op_filename(hash, collision_id))
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}
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pub fn insert(&mut self, img_op: ImageOp) -> String {
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let hash = img_op.hash;
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let collision_id = self.insert_with_collisions(img_op);
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self.op_url(hash, collision_id)
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}
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pub fn prune(&self) -> Result<()> {
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// Do not create folders if they don't exist
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if !self.resized_path.exists() {
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return Ok(());
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}
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ufs::ensure_directory_exists(&self.resized_path)?;
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let entries = fs::read_dir(&self.resized_path)?;
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for entry in entries {
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let entry_path = entry?.path();
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if entry_path.is_file() {
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let filename = entry_path.file_name().unwrap().to_string_lossy();
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if let Some(capts) = RESIZED_FILENAME.captures(filename.as_ref()) {
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let hash = u64::from_str_radix(capts.get(1).unwrap().as_str(), 16).unwrap();
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let collision_id = u32::from_str_radix(
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capts.get(2).unwrap().as_str(), 16,
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).unwrap();
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if collision_id > 0 || !self.img_ops.contains_key(&hash) {
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fs::remove_file(&entry_path)?;
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}
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}
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}
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}
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Ok(())
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}
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pub fn do_process(&mut self) -> Result<()> {
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if !self.img_ops.is_empty() {
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ufs::ensure_directory_exists(&self.resized_path)?;
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}
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self.img_ops.par_iter().map(|(hash, op)| {
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let target = self.resized_path.join(Self::op_filename(*hash, op.collision_id));
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op.perform(&self.content_path, &target)
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.chain_err(|| format!("Failed to process image: {}", op.source))
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}).collect::<Result<()>>()
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}
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}
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/// Looks at file's extension and returns whether it's a supported image format
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pub fn file_is_img<P: AsRef<Path>>(p: P) -> bool {
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p.as_ref().extension().and_then(|s| s.to_str()).map(|ext| {
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match ext.to_lowercase().as_str() {
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"jpg" | "jpeg" => true,
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"png" => true,
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"gif" => true,
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"bmp" => true,
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_ => false,
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}
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}).unwrap_or(false)
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}
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