[mythtv-commits] Ticket #12424: Replacement Gallery using MythUI & Storage Groups

[MythTV]

#12424: Replacement Gallery using MythUI & Storage Groups
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     Reporter:  Roger Siddons <dizygotheca@…>  |      Owner:
         Type:  Patch - Feature                |     Status:  new
     Priority:  minor                          |  Milestone:  unknown
    Component:  Plugin - MythGallery           |    Version:  Master Head
     Severity:  medium                         |   Keywords:
Ticket locked:  0                              |
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 **Notes**

 Tested with Qt 4.8 and Qt 5.2.1

 Backend manages images in Storage Group and supports multiple
 frontends/service clients.

 Backend generates thumbnails for FE's and service clients. They are pre-
 generated in a (low-priority) background thread to improve FE
 performance. They are also generated on-demand when necessary.

 Thumbnails reside in <BE user>/.mythtv/tmp/Photographs. FE's cache
 displayed images & thumbnails in <FE
 user>/.mythtv/cache/themecache/<themedir>. Both caches are synced to the
 Db to prevent cache overflow.

 The Thumbnail View screen implements zoom by switching buttonlist widgets.
 A theme must define an "images0" buttonlist (most zoomed-out) and can
 optionally define others to enable zoom. The default theme provides 10x6,
 8x4, 6x3, 4x2 views.

 Provides basic management functions (Create Dir, Delete, Copy/Move) which
 can be password-protected to thwart little fingers/prevent data loss.

 Provides some basic animated slideshow transitions using zoom, rotate,
 fade, translate and a framework for easily adding more.

 Displays Exif metadata and date/orientaton of videos. Images can be sorted
 by metadata timestamp. Photos are auto-rotated using Exif data; video
 auto-rotation TBD.

 Never writes Exif metadata to image files. Exif standards are poorly
 defined and modification may lead to corruption/data loss. Images may
 (should) have read-only permissions. Orientation overrides are stored in
 Db only.

 The menu is a 'smart' in that the displayed optons depend upon the item(s)
 selected.

 **!Deficiencies/Known Issues.**

 Uses current schema (>1318). However its use of the db has changed and is
 not compatible with old 'New Image Gallery'. Clear image database
 ("gallery_files" table) first. It abuses the current schema - a schema
 update is required to tidy it up.

 Does not yet support mythmediaserver.

 Services API is incomplete.

 Videos are not played in correct orientation.

 Slideshow zoom wobbles between 70% - 110% zoom.

 Not integrated with shutdown. Initial scans of large libraries will take a
 significant time to generate thumbnails.

 **Patches**
 (No dependencies)

 1. MythUI image centring. Images that are smaller than a widget are
 centred, but the image zoom is currently ignored. This results in a
 slideshow image being displaced when it is zoomed. This patch improves the
 problem but it may not be a complete solution as the image still wobbles
 when being zoomed.

 2. MythUI image re-sizing. An image is currently re-sized before being
 orientated. This results in the bottom of portrait-orientated pics going
 off-screen. This patch orientates an image before determining its size.

 3. MythUI image orientation. Orientation is currently inverted -portrait
 images are shown upside-down.

 4. Replacement gallery. Lots of new/deleted/renamed files but all isolated
 Gallery code, except for frontend/main (key bindings & startup) and
 mythuifilebrowser (to make it sub-classable)

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Ticket URL: <https://code.mythtv.org/trac/ticket/12424>
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