| Sunday, June 14th, 2015, 00:17 UTC | ||
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| [06:31:38] | dekarl: | tonsofpcs: IIRC its in the PHP Bindings https://github.com/MythTV/mythtv/blob/master/ . . . hBackend.php |
| [06:42:11] | tonsofpcs: | dekarl: thanks, I found my issue, was /usr/local/lib/perl (and probably some others in /usr/local) forcing it to 72 instead of 77... |
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| [13:06:17] | peper03: | Anyone clued up on overlay implementation techniques? One of the Bluray overlay types uses an 8-bit indexed image with a YUVT palette. We get events to mark the start and end of an overlay 'session', and other events inbetween to clear either everything or specific portions, or to draw. |
| [13:07:01] | peper03: | The 'draw' event may only update the palette, so the overlay must remain as an indexed image + palette. |
| [13:07:59] | peper03: | So how do you mark a pixel as 'transparent' when there is no fixed transparent entry in the palette? |
| [13:08:25] | peper03: | i.e. How do you initialise an empty image, or clear a rectangle? |
| [13:09:17] | peper03: | You can't even search for the palette for a transparent entry because there may not be one (unlikely but possible, I guess) and you can't be sure that a palette update doesn't change that particular entry to no longer be transparent. |
| [13:09:46] | peper03: | I can think of two basic ways of doing it: |
| [13:10:58] | peper03: | 1. Keep each update event (draw this bitmap at x,y;clear this region; etc) and re-render the entire chain into an ARGB overlay every time the overlay is updated. |
| [13:11:44] | peper03: | 2. Keep a separate 1-bit alpha mask and update that as areas are cleared or drawn into. |
| [13:12:41] | peper03: | Both add overhead that could potentially be substantial as an overlay can be updated at the underlying video's framerate. |
| [13:18:57] | peper03: | If it weren't for the possibility of only updating the palette (for things like fades), we could always render each update straight into an ARGB buffer as it comes in. |
| [13:20:33] | peper03: | If there's another way of doing it, I'm all ears! |
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