[mythtv-commits] Ticket #7739: Backspace is not supported in EIA-708 (ATSC) closed captions

[MythTV]

#7739: Backspace is not supported in EIA-708 (ATSC) closed captions
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 Reporter:  Clayton Smith <argilo@…>          |       Owner:  danielk
     Type:  defect                            |      Status:  new    
 Priority:  minor                             |   Milestone:  unknown
Component:  MythTV - ATSC                     |     Version:  head   
 Severity:  medium                            |     Mlocked:  0      
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Comment(by danielk):

 Backspace should probably go in the opposite direction of the current
 scroll direction. Who are these clowns sending a backspace character in
 captions anyway?!?

 So to implement add a DecrPenLocation() that does the opposite of what
 IncrPenLocation() does, then when IncrPenLocation() is expanded to handle
 all the scroll directions DecrPenLocation() can be updated as well. Also,
 after calling DecrPenLocation() set the character under the pen location
 to a space, to mimic what happens in an editor. That should handle
 LeftToRight text in addition to RightToLeft, and both TopToBottom and
 BottomToTop scrolling.

 This is a good reference for the standard:
   http://en.wikipedia.org/wiki/CEA-708

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Ticket URL: <http://svn.mythtv.org/trac/ticket/7739#comment:3>
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