[Bug 45558] New: cannot render on a drawable of size equal the max framebuffer size

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https://bugs.freedesktop.org/show_bug.cgi?id=45558

             Bug #: 45558
           Summary: cannot render on a drawable of size equal the max
                    framebuffer size
    Classification: Unclassified
           Product: Mesa
           Version: git
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i830
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: prahal@yahoo.com


Created attachment 56550
  --> https://bugs.freedesktop.org/attachment.cgi?id=56550
do not drift one pixel above what we want - x2, y2 are exclusive max

The xorg drawable sizes are exclusive as I have learned on xorg-devel irc
channel by MrCooper.
This means that width = x2 - x1 , x2 behing exclusive and thus in the places
the code does DrawBuffer->Width + x1 to get the right coordinate when we get a
coordinate one pixel above what we want (ie we send x2 which is exclusive).

This patch fixes a few places were the gen2 865g are affected by this bug. That
is gnome-shell renders badly due to cogl using atlas a power of two of the
resolution (which is good but this leads to 2048 which is the framebuffer max
size on gen2).

I will also attach the testcase I used which is dumb but reproduce the same
issue as gnome-shell /cogl. Ie a drawable attached to the context as read and
draw buffer the size equal to framebuffer max size , ie 2048, on 865g gen2.

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