[Bug 765927] new plugin: ICC (International Color Consortium) correction plugin

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765927

Andreas Frisch <fraxinas at opendreambox.org> changed:

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--- Comment #3 from Andreas Frisch <fraxinas at opendreambox.org> ---
Created attachment 327276
  --> https://bugzilla.gnome.org/attachment.cgi?id=327276&action=edit
initial add colormanagement plugin with lcms icc correction element V2

this is my next attempt
the last version had some major issues
- lcms would segfault for missing icc profiles, therefore now making sure they
are specified, otherwise fall back to built-in sRGB
- alpha wasn't copied properly
- lcms corrupts the subsequent data when doing in-place transformation (which
the doc say should work). i haven't debugged the lib yet but i sent a mail to
lcms-user and worked around this by always disabling in-place transformation
- added pure black preservation

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