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imageproc: Add the `format` option, support for PNG thumbnails 

Fix #546
This commit is contained in:
Vojtech Kral 2018-12-28 00:54:06 +01:00
parent 9200d540ba
commit 6e84eec32b
2 changed files with 100 additions and 30 deletions
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123
components/imageproc/src/lib.rs
View File

@ -15,6 +15,7 @@ use std::hash::{Hash, Hasher};
use std::path::{Path, PathBuf};
use image::jpeg::JPEGEncoder;
use image::png::PNGEncoder;
use image::{FilterType, GenericImageView};
use rayon::prelude::*;
use regex::Regex;
@ -26,7 +27,7 @@ static RESIZED_SUBDIR: &'static str = "processed_images";
lazy_static! {
pub static ref RESIZED_FILENAME: Regex =
Regex::new(r#"([0-9a-f]{16})([0-9a-f]{2})[.]jpg"#).unwrap();
Regex::new(r#"([0-9a-f]{16})([0-9a-f]{2})[.](jpg|png)"#).unwrap();
}
/// Describes the precise kind of a resize operation
@ -136,12 +137,78 @@ impl Hash for ResizeOp {
}
}
/// Thumbnail image format
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Format {
/// JPEG, The `u8` argument is JPEG quality (in percent).
Jpeg(u8),
/// PNG
Png,
}
impl Format {
pub fn from_args(source: &str, format: &str, quality: u8) -> Result<Format> {
use Format::*;
assert!(quality > 0 && quality <= 100, "Jpeg quality must be within the range [1; 100]");
match format {
"auto" => match Self::is_lossy(source) {
Some(true) => Ok(Jpeg(quality)),
Some(false) => Ok(Png),
None => Err(format!("Unsupported image file: {}", source).into()),
},
"jpeg" | "jpg" => Ok(Jpeg(quality)),
"png" => Ok(Png),
_ => Err(format!("Invalid image format: {}", format).into()),
}
}
/// Looks at file's extension and, if it's a supported image format, returns whether the format is lossless
pub fn is_lossy<P: AsRef<Path>>(p: P) -> Option<bool> {
p.as_ref()
.extension()
.and_then(|s| s.to_str())
.map(|ext| match ext.to_lowercase().as_str() {
"jpg" | "jpeg" => Some(true),
"png" => Some(false),
"gif" => Some(false),
"bmp" => Some(false),
_ => None,
})
.unwrap_or(None)
}
fn extension(&self) -> &str {
// Kept in sync with RESIZED_FILENAME and op_filename
use Format::*;
match *self {
Png => "png",
Jpeg(_) => "jpg",
}
}
}
impl Hash for Format {
fn hash<H: Hasher>(&self, hasher: &mut H) {
use Format::*;
let q = match *self {
Png => 0,
Jpeg(q) => q,
};
hasher.write_u8(q);
}
}
/// Holds all data needed to perform a resize operation
#[derive(Debug, PartialEq, Eq)]
pub struct ImageOp {
source: String,
op: ResizeOp,
quality: u8,
format: Format,
/// Hash of the above parameters
hash: u64,
/// If there is a hash collision with another ImageOp, this contains a sequential ID > 1
@ -152,14 +219,14 @@ pub struct ImageOp {
}
impl ImageOp {
pub fn new(source: String, op: ResizeOp, quality: u8) -> ImageOp {
pub fn new(source: String, op: ResizeOp, format: Format) -> ImageOp {
let mut hasher = DefaultHasher::new();
hasher.write(source.as_ref());
op.hash(&mut hasher);
hasher.write_u8(quality);
format.hash(&mut hasher);
let hash = hasher.finish();
ImageOp { source, op, quality, hash, collision_id: 0 }
ImageOp { source, op, format, hash, collision_id: 0 }
}
pub fn from_args(
@ -167,10 +234,12 @@ impl ImageOp {
op: &str,
width: Option<u32>,
height: Option<u32>,
format: &str,
quality: u8,
) -> Result<ImageOp> {
let op = ResizeOp::from_args(op, width, height)?;
Ok(Self::new(source, op, quality))
let format = Format::from_args(&source, format, quality)?;
Ok(Self::new(source, op, format))
}
fn perform(&self, content_path: &Path, target_path: &Path) -> Result<()> {
@ -223,9 +292,19 @@ impl ImageOp {
};
let mut f = File::create(target_path)?;
let mut enc = JPEGEncoder::new_with_quality(&mut f, self.quality);
let (img_w, img_h) = img.dimensions();
enc.encode(&img.raw_pixels(), img_w, img_h, img.color())?;
match self.format {
Format::Png => {
let mut enc = PNGEncoder::new(&mut f);
enc.encode(&img.raw_pixels(), img_w, img_h, img.color())?;
},
Format::Jpeg(q) => {
let mut enc = JPEGEncoder::new_with_quality(&mut f, q);
enc.encode(&img.raw_pixels(), img_w, img_h, img.color())?;
},
}
Ok(())
}
}
@ -323,20 +402,21 @@ impl Processor {
collision_id
}
fn op_filename(hash: u64, collision_id: u32) -> String {
fn op_filename(hash: u64, collision_id: u32, format: Format) -> String {
// Please keep this in sync with RESIZED_FILENAME
assert!(collision_id < 256, "Unexpectedly large number of collisions: {}", collision_id);
format!("{:016x}{:02x}.jpg", hash, collision_id)
format!("{:016x}{:02x}.{}", hash, collision_id, format.extension())
}
fn op_url(&self, hash: u64, collision_id: u32) -> String {
format!("{}/{}", &self.resized_url, Self::op_filename(hash, collision_id))
fn op_url(&self, hash: u64, collision_id: u32, format: Format) -> String {
format!("{}/{}", &self.resized_url, Self::op_filename(hash, collision_id, format))
}
pub fn insert(&mut self, img_op: ImageOp) -> String {
let hash = img_op.hash;
let format = img_op.format;
let collision_id = self.insert_with_collisions(img_op);
self.op_url(hash, collision_id)
self.op_url(hash, collision_id, format)
}
pub fn prune(&self) -> Result<()> {
@ -373,25 +453,10 @@ impl Processor {
self.img_ops
.par_iter()
.map(|(hash, op)| {
let target = self.resized_path.join(Self::op_filename(*hash, op.collision_id));
let target = self.resized_path.join(Self::op_filename(*hash, op.collision_id, op.format));
op.perform(&self.content_path, &target)
.chain_err(|| format!("Failed to process image: {}", op.source))
})
.collect::<Result<()>>()
}
}
/// Looks at file's extension and returns whether it's a supported image format
pub fn file_is_img<P: AsRef<Path>>(p: P) -> bool {
p.as_ref()
.extension()
.and_then(|s| s.to_str())
.map(|ext| match ext.to_lowercase().as_str() {
"jpg" | "jpeg" => true,
"png" => true,
"gif" => true,
"bmp" => true,
_ => false,
})
.unwrap_or(false)
}

7
components/templates/src/global_fns/mod.rs
View File

@ -194,6 +194,7 @@ pub fn make_get_taxonomy_url(all_taxonomies: &[Taxonomy]) -> GlobalFn {
pub fn make_resize_image(imageproc: Arc<Mutex<imageproc::Processor>>) -> GlobalFn {
static DEFAULT_OP: &'static str = "fill";
static DEFAULT_FMT: &'static str = "auto";
const DEFAULT_Q: u8 = 75;
Box::new(move |args| -> Result<Value> {
@ -214,6 +215,10 @@ pub fn make_resize_image(imageproc: Arc<Mutex<imageproc::Processor>>) -> GlobalF
);
let op = optional_arg!(String, args.get("op"), "`resize_image`: `op` must be a string")
.unwrap_or_else(|| DEFAULT_OP.to_string());
let format = optional_arg!(String, args.get("format"), "`resize_image`: `format` must be a string")
.unwrap_or_else(|| DEFAULT_FMT.to_string());
let quality =
optional_arg!(u8, args.get("quality"), "`resize_image`: `quality` must be a number")
.unwrap_or(DEFAULT_Q);
@ -226,7 +231,7 @@ pub fn make_resize_image(imageproc: Arc<Mutex<imageproc::Processor>>) -> GlobalF
return Err(format!("`resize_image`: Cannot find path: {}", path).into());
}
let imageop = imageproc::ImageOp::from_args(path, &op, width, height, quality)
let imageop = imageproc::ImageOp::from_args(path, &op, width, height, &format, quality)
.map_err(|e| format!("`resize_image`: {}", e))?;
let url = imageproc.insert(imageop);