Support for top/left positions for capture

[IAmJSD]

Top/left support would be extremely useful in some situations.

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[sindresorhus]

Please elaborate what you mean by that and why and when it would be useful.

[IAmJSD]

Most API's (such as a lot of functionality in Electron) use the start point as the top-left corner. This is the "top" and "left" position. I believe it would be useful for this library.

[sindresorhus]

Most API's (such as a lot of functionality in Electron) use the start point as the top-left corner.

This is not entirely correct. Electron might return top-left, but the standard on macOS is bottom-left (except for some Quartz APIs like CGWindowListCopyWindowInfo).

[sindresorhus]

But yes, we could add this as an optional flag. Maybe called isFlipped or isFlippedCropRect.

We just need to invert the vertical coordinate: https://stackoverflow.com/questions/852875/how-do-i-convert-cocoa-co-ords-from-top-left-origin-to-bottom-left-origin

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[sindresorhus]

See #66 for the previous effort.

[IAmJSD]

HI! Sorry, I've been busy for ages and haven't really had a chance to check GitHub. I updated my repository so it works! @sindresorhus