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David Taylor d0243f741e
UX: Use dominant color as image loading placeholder (#18248) 
We previously had a system which would generate a 10x10px preview of images and add their URLs in a data-small-upload attribute. The client would then use that as the background-image of the `<img>` element. This works reasonably well on fast connections, but on slower connections it can take a few seconds for the placeholders to appear. The act of loading the placeholders can also break or delay the loading of the 'real' images.

This commit replaces the placeholder logic with a new approach. Instead of a 10x10px preview, we use imagemagick to calculate the average color of an image and store it in the database. The hex color value then added as a `data-dominant-color` attribute on the `<img>` element, and the client can use this as a `background-color` on the element while the real image is loading. That means no extra HTTP request is required, and so the placeholder color can appear instantly.

Dominant color will be calculated:
1. When a new upload is created
2. During a post rebake, if the dominant color is missing from an upload, it will be calculated and stored
3. Every 15 minutes, 25 old upload records are fetched and their dominant color calculated and stored. (part of the existing PeriodicalUpdates job)

Existing posts will continue to use the old 10x10px placeholder system until they are next rebaked
 		2022-09-20 10:28:17 +01:00
..
allowed_pm_users.rb FEATURE: Allow List for PMs (#10270) 2020-07-20 15:23:49 -06:00
api_key_fabricator.rb FEATURE: Hash API keys in the database (#8438) 2019-12-12 11:45:00 +00:00
associated_group_fabricator.rb FEATURE: Experimental support for group membership via google auth (#14835) 2021-12-09 12:30:27 +00:00
badge_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
bookmark_fabricator.rb FEATURE: Promote polymorphic bookmarks to default and migrate (#16729) 2022-05-23 10:07:15 +10:00
category_fabricator.rb DEV: Fix `fabricator` deprecations (#17658) 2022-07-26 01:47:09 +02:00
category_group_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
color_scheme_color_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
color_scheme_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
dimissed_topic_user.rb FEATURE: New way to dismiss new topics (#11927) 2021-02-04 11:27:34 +11:00
do_not_disturb_fabricator.rb FEATURE: Do not disturb (#11484) 2020-12-18 09:03:51 -06:00
email_change_request_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
email_log_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
email_token_fabricator.rb DEV: Hash tokens stored from email_tokens (#14493) 2021-11-25 09:34:39 +02:00
embeddable_host_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
external_upload_stub_fabricator.rb DEV: Add API docs for uploads and API doc watcher (#15387) 2021-12-23 08:40:15 +10:00
flag_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
group_fabricator.rb DEV: Add SMTP group ID to EmailLog (#13381) 2021-06-15 11:29:46 +10:00
group_history_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
group_request_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
group_user_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
ignored_user_fabricator.rb DEV: Cleanup ignored user logic (#11107) 2020-11-03 12:38:54 +00:00
incoming_email_fabricator.rb DEV: Correctly tag heredocs (#16061) 2022-02-28 20:50:55 +01:00
incoming_link_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
invite_fabricator.rb FEATURE: send max 200 emails every minute for bulk invites (#7875) 2019-07-19 11:29:12 +05:30
invited_user_fabricator.rb FEATURE: multiple use invite links (#9813) 2020-06-09 20:49:32 +05:30
like_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
muted_user.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
notification_fabricator.rb FEATURE: High priority bookmark reminder notifications (#9290) 2020-04-01 09:09:20 +10:00
optimized_image_fabricator.rb DEV: Fix OptimizedImage specs 2020-07-06 21:51:56 +02:00
permalink_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
post_action_fabricator.rb FIX: correct user serializer user method for extended serializer (#8590) 2019-12-19 09:48:01 -08:00
post_custom_field_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
post_detail_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
post_fabricator.rb DEV: Add messages tab to the new user menu (#17850) 2022-08-10 08:25:39 +03:00
post_reply_key_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
post_revision_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
published_page_fabricator.rb FEATURE: allows published pages to be public (#10053) 2020-06-17 12:42:20 +02:00
reviewable_claimed_topic_fabricator.rb FEATURE: Claim Reviewables by Topic 2019-05-09 13:40:36 -04:00
reviewable_fabricator.rb FEATURE: Notify responders of post removal (#15049) 2021-11-24 09:28:20 -06:00
reviewable_score_fabricator.rb FEATURE: Notify responders of post removal (#15049) 2021-11-24 09:28:20 -06:00
screened_email_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
screened_ip_address_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
screened_url_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
search_log_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
shared_draft_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
sidebar_section_link_fabricator.rb FEATURE: Decouple category/tag presence in sidebar from notifi level (#17273) 2022-06-30 14:54:20 +08:00
single_sign_on_record_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
skipped_email_log_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
tag_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
tag_group_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
tag_group_permission_fabricator.rb SECURITY: Only show tags to users with permission (#15148) 2021-12-01 10:26:56 +08:00
theme_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
theme_field_fabricator.rb FIX: add theme field errors (#12880) 2021-04-28 15:00:37 -07:00
topic_allowed_group_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
topic_allowed_user_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
topic_embed_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
topic_fabricator.rb FIX: Update user stat counts when post/topic visibility changes. (#15883) 2022-02-11 09:00:58 +08:00
topic_tag_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
topic_timer_fabricator.rb DEV: Use dynamic/static fabricator attrs correctly (#9519) 2020-04-22 20:49:53 +02:00
topic_user_fabricator.rb FIX: Issues with incorrect unread and private message topic tracking state (#16474) 2022-04-19 11:37:01 +10:00
upload_fabricator.rb UX: Use dominant color as image loading placeholder (#18248) 2022-09-20 10:28:17 +01:00
user_action_fabricator.rb DEV: Remove PostAction/UserAction bookmark refs (#16681) 2022-05-10 10:42:18 +10:00
user_api_key_fabricator.rb DEV: Introduce plugin API to contribute user api key scopes 2020-10-19 10:40:55 +01:00
user_avatar_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_email_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_fabricator.rb FEATURE: Introduce site setting to allow for non staff pm tagging (#16671) 2022-05-10 10:02:28 -05:00
user_field_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_field_option_fabricator.rb.rb FIX: Validate value of custom dropdown user fields - dropdowns and multiple selects (#13890) 2021-07-30 13:50:47 -04:00
user_history_fabricator.rb FIX: respect user timezone in emails about silencing and suspending (#16918) 2022-05-27 13:58:54 +04:00
user_option_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_profile_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_second_factor_fabricator.rb DEV: use #frozen_string_literal: true on all spec 2019-04-30 10:27:42 +10:00
user_security_key_fabricator.rb FEATURE: Webauthn authenticator management with 2FA login (Security Keys) (#8099) 2019-10-01 19:08:41 -07:00
user_status_fabricator.rb FEATURE: user status (#16875) 2022-05-27 13:15:14 +04:00
watched_word_fabricator.rb DEV: Use dynamic/static fabricator attrs correctly (#9519) 2020-04-22 20:49:53 +02:00
web_crawler_request_fabricator.rb DEV: Use dynamic/static fabricator attrs correctly (#9519) 2020-04-22 20:49:53 +02:00
web_hook_fabricator.rb FEATURE: adds the user_promoted event to webhooks (#15996) 2022-02-22 10:57:18 +01:00