our green bricks, now flipped vertically.
https://asdf.donotsta.re/media/87d4f0597ca385fcf7460b9ec3b059df00db8ca738f6366ee96d9e8b167070eb.png
oh, better! it does check the value properly, but only the width. height can be negative.
and oh my gosh @mothcompute was right. if I set the values to 0x20000000, 0xe0ffffff (32 x -32) then we get a flipped image, where the top of the file ACTUALLY is the top of the file!!
… at least in GIMP and firefox. feh just ignores it
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