add ClippingRect #1450
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add ClippingRect #1450
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in rust-sdl2, Rect can't have a zero width or height. This is instead represented with Option, where None covers this case.
The Canvas
set_clip_rectandclip_rectfunction work with Option as well. However, for those functions None instead represents the lack of a clipping rect. This is distinctly differently, as clearing the clipping rect is like setting a Rect with an infinite area, and not a zero area (which would instead disable drawing).This is value aliasing which can be corrected with a better type representation; it's impossible with current API to set a clipping rect with a zero area, which is a valid request that disables drawing. Since this has been fixed in sdl2, this MR keep in sync with upstream.
This is not backwards compatible. Thoughts?