image-source: Set minimal size for color source to 1 pixel

[exeldro]

Description

Set minimal size for color source to 1 pixel

Motivation and Context

OBS can't create draw a sprite without a width/height and will complain about it in the OBS log file.

How Has This Been Tested?

On windows 11 by checking the OBS log file

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[gxalpha]

I think it in addition it would also make sense to test (and, if necessary, clamp) the values in the update method to prevent the behavior via plugins/websockets, not just the UI.

[Warchamp7]

The UI shouldn't allow bad values, I agree with that.

But can this also be adjusted on the libobs side as well to not try to create an invalid sprite?

[exeldro]

Added check in color_source_update