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

Paul B Mahol onemda at gmail.com
Fri Apr 8 22:11:19 CEST 2016

On 4/7/16, Martin Vignali <martin.vignali at gmail.com> wrote:
> 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

Crashes with:


Please use int and unsigned instead of int32_t and uint32_t.

> Martin
> Jokyo Images

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