Grayscale Selections

[Sven Langkamp]

On Sat, Jul 2, 2011 at 5:28 PM, Cyrille Berger Skott <cberger at cberger.net>wrote:

> On Tuesday 28 June 2011, Cyrille Berger Skott wrote:
> > Alternatively, you need to refactor pigment, you have two paths:
> > * huge refactoring: the alpha channel is seperated from the color space,
> > and RGB and RGBA becomes the same class (or Gray and GrayA), in the paint
> > device, the channel is added seperately, and when bitblt, we pass a
> > seperate pointer to the alpha channel, that can be null or not (ie like
> > the mask)
> > * smaller solution: make it possible to create composite op that work
> > across color spaces
>
> There is a third solution
> * detect in KoColorSpace::bitBlt that the destination color space is the
> same
> as the source color space without alpha, and add an alpha channel to the
> data
> and then discard it, but that is not going to be performant.
>

I thought about that too, but then you pratically need another paint device
in grayscale colorspace than is used for a tempory bitBlt.
Of course that means two bitBlt.
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