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List:       gnash-commit
Subject:    [Gnash-commit] [bug #47540] Gnash should support rendering SWF without background color
From:       Nutchanon Wetchasit <INVALID.NOREPLY () gnu ! org>
Date:       2016-03-26 8:19:12
Message-ID: 20160326-151911.sv82809.25550 () savannah ! gnu ! org
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URL:
  <http://savannah.gnu.org/bugs/?47540>

                 Summary: Gnash should support rendering SWF without
background color
                 Project: Gnash - The GNU Flash player
            Submitted by: nachanon
            Submitted on: Sat 26 Mar 2016 03:19:11 PM ICT
                Category: renderer
                Severity: 3 - Normal
                 Release: master
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any

    _______________________________________________________

Details:

This entry is not a bug, but rather a feature request.

Follow up from a mailing list discussion:
https://lists.gnu.org/archive/html/gnash/2015-07/msg00000.html
https://lists.gnu.org/archive/html/gnash/2015-07/msg00001.html

I have been wondering about possibility to use Gnash as a general-purpose
animation renderer for a long time. But as SWF has an opaque color-filled
background, the rendered animation frames couldn't be easily overlaid on
other pieces of film or video. To accomodate these uses, Gnash would need
to support rendering/screenshotting/video-dumping SWF without filling
background color.

In order to make this work, Gnash (at least with AGG-based renderer)
would have to do following things:

* Gnash would need to support 32-bit RGB+alpha PNG screenshot output.
* Gnash would need to support 32-bit RGB+alpha video output.
* Renderer would need to render with alpha channel support, on
alpha-supporting canvas.
* Gnash would need to be able to turn off rendering of SWF background color
(or render it as transparent) on request.
* Gnash would need to provide a command line switch to turn off SWF
background.

Gnash: 0.8.11dev (git a72afa5 9-Mar-2016)
System: Debian GNU/Linux 7.0 Wheezy i386





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