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posts: add 720x720 thumbnail size.

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This is used to provide higher resolution thumbnails for high pixel
density displays, such as phones or laptops. If your screen has a 2x
pixel density ratio, then 360x360 thumbnails will be rendered at 720x720
resolution.

We use WebP here because it's about 15% smaller than the equivalent
JPEG, and because if a device has a high enough pixel density to use
this, then it probably supports WebP.

720x720 thumbnails average about 36kb in size, compared to 20.35kb for
360x360 thumbnails and 7.55kb for 180x180 thumbnails.
This commit is contained in:
evazion
2021-12-05 08:23:49 -06:00
parent 92906f7d39
commit 9cb70fa632
4 changed files with 32 additions and 21 deletions
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16
app/models/media_asset.rb
View File

@@ -1,7 +1,7 @@
class MediaAsset < ApplicationRecord
class Error < StandardError; end
VARIANTS = %i[preview crop 180x180 360x360 sample original]
VARIANTS = %i[preview crop 180x180 360x360 720x720 sample original]
has_one :media_metadata, dependent: :destroy
has_one :pixiv_ugoira_frame_data, class_name: "PixivUgoiraFrameData", foreign_key: :md5, primary_key: :md5
@@ -59,13 +59,15 @@ class MediaAsset < ApplicationRecord
def convert_file(media_file)
case variant
in :preview, :"180x180", :"360x360"
media_file.preview(width, height)
media_file.preview(width, height, format: :jpeg, quality: 85)
in :"720x720"
media_file.preview(width, height, format: :webp, quality: 75)
in :crop
media_file.crop(width, height)
in :sample if media_asset.is_ugoira?
media_file.convert
in :sample if media_asset.is_static_image?
media_file.preview(width, height)
media_file.preview(width, height, format: :jpeg, quality: 85)
in :original
media_file
end
@@ -76,7 +78,7 @@ class MediaAsset < ApplicationRecord
end
def file_path(slug = "")
if variant.in?(%i[preview crop 180x180 360x360]) && media_asset.is_flash?
if variant.in?(%i[preview crop 180x180 360x360 720x720]) && media_asset.is_flash?
"/images/download-preview.png"
else
slug = "__#{slug}__" if slug.present?
@@ -100,6 +102,8 @@ class MediaAsset < ApplicationRecord
case variant
when :preview, :crop, :"180x180", :"360x360"
"jpg"
when :"720x720"
"webp"
when :sample
media_asset.is_ugoira? ? "webm" : "jpg"
when :original
@@ -117,6 +121,8 @@ class MediaAsset < ApplicationRecord
[180, 180]
when :"360x360"
[360, 360]
when :"720x720"
[720, 720]
when :sample
[850, nil]
when :original
@@ -151,6 +157,8 @@ class MediaAsset < ApplicationRecord
true
when :"360x360"
true
when :"720x720"
true
when :sample
media_asset.is_ugoira? || (media_asset.is_static_image? && media_asset.image_width > Danbooru.config.large_image_width)
when :original