[FFmpeg-devel] libavcodec/exr : add support for datawindow who exceed display window

[Martin Vignali]

Hello,

in attach, a patch with some modifications in size/data window management,
in order to manage
negative datawindow/display window, and datawindow who can exceed display
window

Size of the picture is now set from min and max value of the display window
(before the patch, xmin, ymin of the display window are ignored (and assume
to be 0))

With the previous patch (fix channel detection), official samples
./scanline/Blobbies.exr
can now be correctly decode.


DataWindow bigger than display window is a feature of the openExr.
It can be use in some softwares, (for example to improve blur quality)
Following the official documentation, for display, we need to use the
display window only.


In this patch, xmin, xmax, ymin, ymax, are now int32_t instead of uint32_t,
because these values can be negative. (See officiel sample ./Displaywindow
http://download.savannah.nongnu.org/releases/openexr/openexr-images-1.7.0.tar.gz
)

Comments welcome

Martin
Jokyo Images
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