SurfaceConstrains usage

Using Cinder
1

Hello,

I guess this is super trivial, but it doesn’t make much sense to me.

If I try to create a Surface8uRef from an ImageSourceRef with BGRX channel order, the surface that is created has a channel order of RGBA.

How would I use ‘SurfaceConstrains’ to tell Surface8u::create to create one with BGRX??

Is this possible or should I just use Surface::setChannelOrder to fix the channel order after creation?

Thanks!

2

You could definitely just copy after the fact, but if you wanted to use SurfaceConstraints to get it in one go, it would be roughly this (untested):

class ForceBgrx : public SurfaceConstraints {
 public:
    SurfaceChannelOrder getChannelOrder( bool alpha ) const override
    { return SurfaceChannelOrder::BGRX; }
};
...
Surface8u s( imageSource, ForceBgrx() );
3

Thanks Andrew! this clarifies it :slight_smile: