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Resize images by area instead of fixed dimensions (#8083)

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To improve the way super tall or super ride images are treated, the
numbers remain the same, 1280x1280 and 400x400, but if an image
is less in one dimension than the other, the other can become larger

Thanks to @WAHa_06x36@mastodon.social for the tip
This commit is contained in:
Eugen Rochko 2018-07-28 03:33:00 +02:00 committed by GitHub
parent 3c35b34b61
commit 0fb0037ca7
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4 changed files with 20 additions and 23 deletions
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18
app/javascript/mastodon/utils/resize_image.js
View file

@ -1,6 +1,6 @@
import EXIF from 'exif-js';
const MAX_IMAGE_DIMENSION = 1280;
const MAX_IMAGE_PIXELS = 1638400; // 1280x1280px
const getImageUrl = inputFile => new Promise((resolve, reject) => {
if (window.URL && URL.createObjectURL) {
@ -73,18 +73,8 @@ const processImage = (img, { width, height, orientation, type = 'image/png' }) =
const resizeImage = (img, type = 'image/png') => new Promise((resolve, reject) => {
const { width, height } = img;
let newWidth, newHeight;
if (width > height) {
newHeight = height * MAX_IMAGE_DIMENSION / width;
newWidth = MAX_IMAGE_DIMENSION;
} else if (height > width) {
newWidth = width * MAX_IMAGE_DIMENSION / height;
newHeight = MAX_IMAGE_DIMENSION;
} else {
newWidth = MAX_IMAGE_DIMENSION;
newHeight = MAX_IMAGE_DIMENSION;
}
const newWidth = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (width / height)));
const newHeight = Math.round(Math.sqrt(MAX_IMAGE_PIXELS * (height / width)));
getOrientation(img, type)
.then(orientation => processImage(img, {
@ -104,7 +94,7 @@ export default inputFile => new Promise((resolve, reject) => {
}
loadImage(inputFile).then(img => {
if (img.width < MAX_IMAGE_DIMENSION && img.height < MAX_IMAGE_DIMENSION) {
if (img.width * img.height < MAX_IMAGE_PIXELS) {
resolve(inputFile);
return;
}

6
app/models/media_attachment.rb
View file

@ -32,12 +32,12 @@ class MediaAttachment < ApplicationRecord
IMAGE_STYLES = {
original: {
geometry: '1280x1280>',
pixels: 1_638_400, # 1280x1280px
file_geometry_parser: FastGeometryParser,
},
small: {
geometry: '400x400>',
pixels: 160_000, # 400x400px
file_geometry_parser: FastGeometryParser,
},
}.freeze
@ -152,7 +152,7 @@ class MediaAttachment < ApplicationRecord
elsif VIDEO_MIME_TYPES.include? f.file_content_type
[:video_transcoder]
else
[:thumbnail]
[:lazy_thumbnail]
end
end
end

13
lib/paperclip/lazy_thumbnail.rb
View file

@ -5,8 +5,14 @@ module Paperclip
def make
return File.open(@file.path) unless needs_convert?
min_side = [@current_geometry.width, @current_geometry.height].min
options[:geometry] = "#{min_side.to_i}x#{min_side.to_i}#" if @target_geometry.square? && min_side < @target_geometry.width
if options[:geometry]
min_side = [@current_geometry.width, @current_geometry.height].min.to_i
options[:geometry] = "#{min_side}x#{min_side}#" if @target_geometry.square? && min_side < @target_geometry.width
elsif options[:pixels]
width = Math.sqrt(options[:pixels] * (@current_geometry.width.to_f / @current_geometry.height.to_f)).round.to_i
height = Math.sqrt(options[:pixels] * (@current_geometry.height.to_f / @current_geometry.width.to_f)).round.to_i
options[:geometry] = "#{width}x#{height}>"
end
Paperclip::Thumbnail.make(file, options, attachment)
end
@ -18,7 +24,8 @@ module Paperclip
end
def needs_different_geometry?
!@target_geometry.nil? && @current_geometry.width != @target_geometry.width && @current_geometry.height != @target_geometry.height
(options[:geometry] && @current_geometry.width != @target_geometry.width && @current_geometry.height != @target_geometry.height) ||
(options[:pixels] && @current_geometry.width * @current_geometry.height > options[:pixels])
end
def needs_different_format?

6
spec/models/media_attachment_spec.rb
View file

@ -129,9 +129,9 @@ RSpec.describe MediaAttachment, type: :model do
expect(media.file.meta["original"]["width"]).to eq 600
expect(media.file.meta["original"]["height"]).to eq 400
expect(media.file.meta["original"]["aspect"]).to eq 1.5
expect(media.file.meta["small"]["width"]).to eq 400
expect(media.file.meta["small"]["height"]).to eq 267
expect(media.file.meta["small"]["aspect"]).to eq 400.0/267
expect(media.file.meta["small"]["width"]).to eq 490
expect(media.file.meta["small"]["height"]).to eq 327
expect(media.file.meta["small"]["aspect"]).to eq 490.0/327
end
end